Annotation of loncom/interface/lonnavmaps.pm, revision 1.444.2.4

1.2       www         1: # The LearningOnline Network with CAPA
                      2: # Navigate Maps Handler
1.1       www         3: #
1.444.2.4! raeburn     4: # $Id: lonnavmaps.pm,v 1.444.2.3 2010/12/30 21:32:17 raeburn Exp $
1.437     foxr        5: 
1.20      albertel    6: #
                      7: # Copyright Michigan State University Board of Trustees
                      8: #
                      9: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
                     10: #
                     11: # LON-CAPA is free software; you can redistribute it and/or modify
                     12: # it under the terms of the GNU General Public License as published by
                     13: # the Free Software Foundation; either version 2 of the License, or
                     14: # (at your option) any later version.
                     15: #
                     16: # LON-CAPA is distributed in the hope that it will be useful,
                     17: # but WITHOUT ANY WARRANTY; without even the implied warranty of
                     18: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
                     19: # GNU General Public License for more details.
                     20: #
                     21: # You should have received a copy of the GNU General Public License
                     22: # along with LON-CAPA; if not, write to the Free Software
                     23: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
                     24: #
                     25: # /home/httpd/html/adm/gpl.txt
                     26: #
                     27: # http://www.lon-capa.org/
                     28: #
1.245     www        29: ###
1.2       www        30: 
1.416     jms        31: =pod
                     32: 
                     33: =head1 NAME
                     34: 
1.435     raeburn    35: Apache::lonnavmaps - Subroutines to handle and render the navigation
1.416     jms        36: 
                     37: =head1 SYNOPSIS
                     38: 
                     39: Handles navigational maps.
                     40: 
                     41: The main handler generates the navigational listing for the course,
                     42: the other objects export this information in a usable fashion for
                     43: other modules.
                     44: 
                     45: 
                     46: This is part of the LearningOnline Network with CAPA project
                     47: described at http://www.lon-capa.org.
                     48: 
                     49: 
                     50: =head1 OVERVIEW
                     51: 
1.439     wenzelju   52: X<lonnavmaps, overview> When a user enters a course, LON-CAPA examines the
1.416     jms        53: course structure and caches it in what is often referred to as the
                     54: "big hash" X<big hash>. You can see it if you are logged into
                     55: LON-CAPA, in a course, by going to /adm/test. (You may need to
                     56: tweak the /home/httpd/lonTabs/htpasswd file to view it.) The
                     57: content of the hash will be under the heading "Big Hash".
                     58: 
                     59: Big Hash contains, among other things, how resources are related
                     60: to each other (next/previous), what resources are maps, which 
                     61: resources are being chosen to not show to the student (for random
                     62: selection), and a lot of other things that can take a lot of time
                     63: to compute due to the amount of data that needs to be collected and
                     64: processed.
                     65: 
                     66: Apache::lonnavmaps provides an object model for manipulating this
                     67: information in a higher-level fashion than directly manipulating 
                     68: the hash. It also provides access to several auxilary functions 
                     69: that aren't necessarily stored in the Big Hash, but are a per-
                     70: resource sort of value, like whether there is any feedback on 
                     71: a given resource.
                     72: 
                     73: Apache::lonnavmaps also abstracts away branching, and someday, 
                     74: conditions, for the times where you don't really care about those
                     75: things.
                     76: 
                     77: Apache::lonnavmaps also provides fairly powerful routines for
                     78: rendering navmaps, and last but not least, provides the navmaps
                     79: view for when the user clicks the NAV button.
                     80: 
                     81: B<Note>: Apache::lonnavmaps I<only> works for the "currently
                     82: logged in user"; if you want things like "due dates for another
                     83: student" lonnavmaps can not directly retrieve information like
                     84: that. You need the EXT function. This module can still help,
                     85: because many things, such as the course structure, are constant
                     86: between users, and Apache::lonnavmaps can help by providing
                     87: symbs for the EXT call.
                     88: 
                     89: The rest of this file will cover the provided rendering routines, 
                     90: which can often be used without fiddling with the navmap object at
                     91: all, then documents the Apache::lonnavmaps::navmap object, which
                     92: is the key to accessing the Big Hash information, covers the use
                     93: of the Iterator (which provides the logic for traversing the 
                     94: somewhat-complicated Big Hash data structure), documents the
                     95: Apache::lonnavmaps::Resource objects that are returned by 
                     96: 
                     97: =head1 Subroutine: render
                     98: 
                     99: The navmap renderer package provides a sophisticated rendering of the
                    100: standard navigation maps interface into HTML. The provided nav map
                    101: handler is actually just a glorified call to this.
                    102: 
                    103: Because of the large number of parameters this function accepts,
                    104: instead of passing it arguments as is normal, pass it in an anonymous
                    105: hash with the desired options.
                    106: 
                    107: The package provides a function called 'render', called as
                    108: Apache::lonnavmaps::render({}).
                    109: 
                    110: =head2 Overview of Columns
                    111: 
                    112: The renderer will build an HTML table for the navmap and return
                    113: it. The table consists of several columns, and a row for each
                    114: resource (or possibly each part). You tell the renderer how many
                    115: columns to create and what to place in each column, optionally using
                    116: one or more of the prepared columns, and the renderer will assemble
                    117: the table.
                    118: 
                    119: Any additional generally useful column types should be placed in the
                    120: renderer code here, so anybody can use it anywhere else. Any code
                    121: specific to the current application (such as the addition of <input>
                    122: elements in a column) should be placed in the code of the thing using
                    123: the renderer.
                    124: 
                    125: At the core of the renderer is the array reference COLS (see Example
                    126: section below for how to pass this correctly). The COLS array will
                    127: consist of entries of one of two types of things: Either an integer
                    128: representing one of the pre-packaged column types, or a sub reference
                    129: that takes a resource reference, a part number, and a reference to the
                    130: argument hash passed to the renderer, and returns a string that will
                    131: be inserted into the HTML representation as it.
                    132: 
                    133: All other parameters are ways of either changing how the columns
                    134: are printing, or which rows are shown.
                    135: 
                    136: The pre-packaged column names are refered to by constants in the
                    137: Apache::lonnavmaps namespace. The following currently exist:
                    138: 
                    139: =over 4
                    140: 
                    141: =item * B<Apache::lonnavmaps::resource>:
                    142: 
                    143: The general info about the resource: Link, icon for the type, etc. The
                    144: first column in the standard nav map display. This column provides the
                    145: indentation effect seen in the B<NAV> screen. This column also accepts
                    146: the following parameters in the renderer hash:
                    147: 
                    148: =over 4
                    149: 
                    150: =item * B<resource_nolink>: default false
                    151: 
                    152: If true, the resource will not be linked. By default, all non-folder
                    153: resources are linked.
                    154: 
                    155: =item * B<resource_part_count>: default true
                    156: 
                    157: If true, the resource will show a part count B<if> the full
                    158: part list is not displayed. (See "condense_parts" later.) If false,
                    159: the resource will never show a part count.
                    160: 
                    161: =item * B<resource_no_folder_link>:
                    162: 
                    163: If true, the resource's folder will not be clickable to open or close
                    164: it. Default is false. True implies printCloseAll is false, since you
                    165: can't close or open folders when this is on anyhow.
                    166: 
                    167: =back
                    168: 
                    169: =item * B<Apache::lonnavmaps::communication_status>:
                    170: 
                    171: Whether there is discussion on the resource, email for the user, or
                    172: (lumped in here) perl errors in the execution of the problem. This is
                    173: the second column in the main nav map.
                    174: 
                    175: =item * B<Apache::lonnavmaps::quick_status>:
                    176: 
                    177: An icon for the status of a problem, with five possible states:
                    178: Correct, incorrect, open, awaiting grading (for a problem where the
                    179: computer's grade is suppressed, or the computer can't grade, like
                    180: essay problem), or none (not open yet, not a problem). The
                    181: third column of the standard navmap.
                    182: 
                    183: =item * B<Apache::lonnavmaps::long_status>:
                    184: 
                    185: A text readout of the details of the current status of the problem,
                    186: such as "Due in 22 hours". The fourth column of the standard navmap.
                    187: 
                    188: =item * B<Apache::lonnavmaps::part_status_summary>:
                    189: 
                    190: A text readout summarizing the status of the problem. If it is a
                    191: single part problem, will display "Correct", "Incorrect", 
                    192: "Not yet open", "Open", "Attempted", or "Error". If there are
                    193: multiple parts, this will output a string that in HTML will show a
                    194: status of how many parts are in each status, in color coding, trying
                    195: to match the colors of the icons within reason.
1.1       www       196: 
1.416     jms       197: Note this only makes sense if you are I<not> showing parts. If 
                    198: C<showParts> is true (see below), this column will not output
                    199: anything. 
1.2       www       200: 
1.416     jms       201: =back
1.133     bowersj2  202: 
1.416     jms       203: If you add any others please be sure to document them here.
1.133     bowersj2  204: 
1.416     jms       205: An example of a column renderer that will show the ID number of a
                    206: resource, along with the part name if any:
1.140     bowersj2  207: 
1.416     jms       208:  sub { 
                    209:   my ($resource, $part, $params) = @_;   
                    210:   if ($part) { return '<td>' . $resource->{ID} . ' ' . $part . '</td>'; }
                    211:   return '<td>' . $resource->{ID} . '</td>';
                    212:  }
1.135     bowersj2  213: 
1.416     jms       214: Note these functions are responsible for the TD tags, which allow them
                    215: to override vertical and horizontal alignment, etc.
1.133     bowersj2  216: 
1.416     jms       217: =head2 Parameters
1.130     www       218: 
1.416     jms       219: Minimally, you should be
                    220: able to get away with just using 'cols' (to specify the columns
                    221: shown), 'url' (necessary for the folders to link to the current screen
                    222: correctly), and possibly 'queryString' if your app calls for it. In
                    223: that case, maintaining the state of the folders will be done
                    224: automatically.
1.268     albertel  225: 
1.416     jms       226: =over 4
1.268     albertel  227: 
1.416     jms       228: =item * B<iterator>: default: constructs one from %env
1.51      bowersj2  229: 
1.416     jms       230: A reference to a fresh ::iterator to use from the navmaps. The
                    231: rendering will reflect the options passed to the iterator, so you can
                    232: use that to just render a certain part of the course, if you like. If
                    233: one is not passed, the renderer will attempt to construct one from
                    234: env{'form.filter'} and env{'form.condition'} information, plus the
                    235: 'iterator_map' parameter if any.
1.51      bowersj2  236: 
1.416     jms       237: =item * B<iterator_map>: default: not used
1.51      bowersj2  238: 
1.416     jms       239: If you are letting the renderer do the iterator handling, you can
                    240: instruct the renderer to render only a particular map by passing it
                    241: the source of the map you want to process, like
                    242: '/res/103/jerf/navmap.course.sequence'.
1.51      bowersj2  243: 
1.416     jms       244: =item * B<include_top_level_map>: default: false
1.51      bowersj2  245: 
1.416     jms       246: If you need to include the top level map (meaning the course) in the
                    247: rendered output set this to true
1.51      bowersj2  248: 
1.416     jms       249: =item * B<navmap>: default: constructs one from %env
1.51      bowersj2  250: 
1.416     jms       251: A reference to a navmap, used only if an iterator is not passed in. If
                    252: this is necessary to make an iterator but it is not passed in, a new
                    253: one will be constructed based on env info. This is useful to do basic
                    254: error checking before passing it off to render.
1.51      bowersj2  255: 
1.416     jms       256: =item * B<r>: default: must be passed in
1.53      bowersj2  257: 
1.416     jms       258: The standard Apache response object. This must be passed to the
                    259: renderer or the course hash will be locked.
1.53      bowersj2  260: 
1.416     jms       261: =item * B<cols>: default: empty (useless)
1.407     raeburn   262: 
1.416     jms       263: An array reference
1.53      bowersj2  264: 
1.416     jms       265: =item * B<showParts>:default true
1.115     bowersj2  266: 
1.416     jms       267: A flag. If true, a line for the resource itself, and a line
                    268: for each part will be displayed. If not, only one line for each
                    269: resource will be displayed.
1.115     bowersj2  270: 
1.416     jms       271: =item * B<condenseParts>: default true
1.115     bowersj2  272: 
1.416     jms       273: A flag. If true, if all parts of the problem have the same
                    274: status and that status is Nothing Set, Correct, or Network Failure,
                    275: then only one line will be displayed for that resource anyhow. If no,
                    276: all parts will always be displayed. If showParts is 0, this is
                    277: ignored.
1.115     bowersj2  278: 
1.416     jms       279: =item * B<jumpCount>: default: determined from %env
1.115     bowersj2  280: 
1.416     jms       281: A string identifying the URL to place the anchor 'curloc' at.
                    282: It is the responsibility of the renderer user to
                    283: ensure that the #curloc is in the URL. By default, determined through
                    284: the use of the env{} 'jump' information, and should normally "just
                    285: work" correctly.
1.177     www       286: 
1.416     jms       287: =item * B<here>: default: empty string
1.68      bowersj2  288: 
1.416     jms       289: A Symb identifying where to place the 'here' marker. The empty
                    290: string means no marker.
1.73      bowersj2  291: 
1.416     jms       292: =item * B<indentString>: default: 25 pixel whitespace image
1.347     www       293: 
1.416     jms       294: A string identifying the indentation string to use. 
1.347     www       295: 
1.416     jms       296: =item * B<queryString>: default: empty
1.346     foxr      297: 
1.416     jms       298: A string which will be prepended to the query string used when the
                    299: folders are opened or closed. You can use this to pass
                    300: application-specific values.
1.73      bowersj2  301: 
1.416     jms       302: =item * B<url>: default: none
1.73      bowersj2  303: 
1.416     jms       304: The url the folders will link to, which should be the current
                    305: page. Required if the resource info column is shown, and you 
                    306: are allowing the user to open and close folders.
1.73      bowersj2  307: 
1.416     jms       308: =item * B<currentJumpIndex>: default: no jumping
1.73      bowersj2  309: 
1.416     jms       310: Describes the currently-open row number to cause the browser to jump
                    311: to, because the user just opened that folder. By default, pulled from
                    312: the Jump information in the env{'form.*'}.
1.73      bowersj2  313: 
1.416     jms       314: =item * B<printKey>: default: false
1.101     bowersj2  315: 
1.416     jms       316: If true, print the key that appears on the top of the standard
                    317: navmaps.
1.73      bowersj2  318: 
1.416     jms       319: =item * B<printCloseAll>: default: true
1.73      bowersj2  320: 
1.416     jms       321: If true, print the "Close all folders" or "open all folders"
                    322: links.
1.403     albertel  323: 
1.416     jms       324: =item * B<filterFunc>: default: sub {return 1;} (accept everything)
1.346     foxr      325: 
1.416     jms       326: A function that takes the resource object as its only parameter and
                    327: returns a true or false value. If true, the resource is displayed. If
                    328: false, it is simply skipped in the display.
1.346     foxr      329: 
1.416     jms       330: =item * B<suppressEmptySequences>: default: false
1.346     foxr      331: 
1.416     jms       332: If you're using a filter function, and displaying sequences to orient
                    333: the user, then frequently some sequences will be empty. Setting this to
                    334: true will cause those sequences not to display, so as not to confuse the
                    335: user into thinking that if the sequence is there there should be things
                    336: under it; for example, see the "Show Uncompleted Homework" view on the
                    337: B<NAV> screen.
1.73      bowersj2  338: 
1.416     jms       339: =item * B<suppressNavmaps>: default: false
1.53      bowersj2  340: 
1.416     jms       341: If true, will not display Navigate Content resources. 
1.51      bowersj2  342: 
1.416     jms       343: =back
1.133     bowersj2  344: 
1.416     jms       345: =head2 Additional Info
1.174     albertel  346: 
1.416     jms       347: In addition to the parameters you can pass to the renderer, which will
                    348: be passed through unchange to the column renderers, the renderer will
                    349: generate the following information which your renderer may find
                    350: useful:
1.174     albertel  351: 
1.416     jms       352: =over 4
1.174     albertel  353: 
1.416     jms       354: =item * B<counter>: 
1.133     bowersj2  355: 
1.416     jms       356: Contains the number of rows printed. Useful after calling the render 
                    357: function, as you can detect whether anything was printed at all.
1.216     bowersj2  358: 
1.416     jms       359: =item * B<isNewBranch>:
1.216     bowersj2  360: 
1.416     jms       361: Useful for renderers: If this resource is currently the first resource
                    362: of a new branch, this will be true. The Resource column (leftmost in the
                    363: navmaps screen) uses this to display the "new branch" icon 
1.216     bowersj2  364: 
1.416     jms       365: =back
1.216     bowersj2  366: 
1.416     jms       367: =cut
1.216     bowersj2  368: 
                    369: 
1.416     jms       370: =head1 SUBROUTINES
1.216     bowersj2  371: 
1.416     jms       372: =over
1.216     bowersj2  373: 
1.416     jms       374: =item update()
1.133     bowersj2  375: 
1.416     jms       376: =item addToFilter()
1.133     bowersj2  377: 
1.416     jms       378: Convenience functions: Returns a string that adds or subtracts
                    379: the second argument from the first hash, appropriate for the 
                    380: query string that determines which folders to recurse on
1.174     albertel  381: 
1.416     jms       382: =item removeFromFilter()
1.51      bowersj2  383: 
1.416     jms       384: =item getLinkForResource()
1.51      bowersj2  385: 
1.416     jms       386: Convenience function: Given a stack returned from getStack on the iterator,
                    387: return the correct src() value.
1.174     albertel  388: 
1.416     jms       389: =item getDescription()
1.174     albertel  390: 
1.416     jms       391: Convenience function: This separates the logic of how to create
                    392: the problem text strings ("Due: DATE", "Open: DATE", "Not yet assigned",
                    393: etc.) into a separate function. It takes a resource object as the
                    394: first parameter, and the part number of the resource as the second.
                    395: It's basically a big switch statement on the status of the resource.
1.174     albertel  396: 
1.416     jms       397: =item dueInLessThan24Hours()
1.216     bowersj2  398: 
1.416     jms       399: Convenience function, so others can use it: Is the problem due in less than 24 hours, and still can be done?
1.51      bowersj2  400: 
1.416     jms       401: =item lastTry()
1.51      bowersj2  402: 
1.416     jms       403: Convenience function, so others can use it: Is there only one try remaining for the
                    404: part, with more than one try to begin with, not due yet and still can be done?
1.51      bowersj2  405: 
1.416     jms       406: =item advancedUser()
1.51      bowersj2  407: 
1.416     jms       408: This puts a human-readable name on the env variable.
1.51      bowersj2  409: 
1.416     jms       410: =item timeToHumanString()
1.51      bowersj2  411: 
1.416     jms       412: timeToHumanString takes a time number and converts it to a
                    413: human-readable representation, meant to be used in the following
                    414: manner:
1.174     albertel  415: 
1.416     jms       416: =over 4
1.51      bowersj2  417: 
1.416     jms       418: =item * print "Due $timestring"
1.133     bowersj2  419: 
1.416     jms       420: =item * print "Open $timestring"
1.133     bowersj2  421: 
1.416     jms       422: =item * print "Answer available $timestring"
1.144     bowersj2  423: 
1.133     bowersj2  424: =back
1.51      bowersj2  425: 
1.416     jms       426: Very, very, very, VERY English-only... goodness help a localizer on
                    427: this func...
1.174     albertel  428: 
1.417     jms       429: =item resource()
1.174     albertel  430: 
1.417     jms       431: returns 0
1.51      bowersj2  432: 
1.417     jms       433: =item communication_status()
1.51      bowersj2  434: 
1.417     jms       435: returns 1
1.174     albertel  436: 
1.417     jms       437: =item quick_status()
1.51      bowersj2  438: 
1.417     jms       439: returns 2
1.225     bowersj2  440: 
1.417     jms       441: =item long_status()
1.225     bowersj2  442: 
1.417     jms       443: returns 3
1.225     bowersj2  444: 
1.417     jms       445: =item part_status_summary()
1.51      bowersj2  446: 
1.417     jms       447: returns 4
1.51      bowersj2  448: 
1.417     jms       449: =item render_resource()
1.51      bowersj2  450: 
1.417     jms       451: =item render_communication_status()
1.51      bowersj2  452: 
1.417     jms       453: =item render_quick_status()
                    454: 
                    455: =item render_long_status()
                    456: 
                    457: =item render_parts_summary_status()
                    458: 
                    459: =item setDefault()
                    460: 
                    461: =item cmp_title()
                    462: 
                    463: =item render()
                    464: 
                    465: =item add_linkitem()
                    466: 
                    467: =item show_linkitems()
1.130     www       468: 
1.416     jms       469: =back
1.115     bowersj2  470: 
1.416     jms       471: =cut
1.140     bowersj2  472: 
1.416     jms       473: package Apache::lonnavmaps;
1.51      bowersj2  474: 
1.416     jms       475: use strict;
                    476: use GDBM_File;
                    477: use Apache::loncommon();
                    478: use Apache::lonenc();
                    479: use Apache::lonlocal;
                    480: use Apache::lonnet;
1.443     foxr      481: 
1.416     jms       482: use POSIX qw (floor strftime);
                    483: use Time::HiRes qw( gettimeofday tv_interval );
                    484: use LONCAPA;
                    485: use DateTime();
1.174     albertel  486: 
1.416     jms       487: # symbolic constants
                    488: sub SYMB { return 1; }
                    489: sub URL { return 2; }
                    490: sub NOTHING { return 3; }
1.174     albertel  491: 
1.416     jms       492: # Some data
1.174     albertel  493: 
1.416     jms       494: my $resObj = "Apache::lonnavmaps::resource";
1.174     albertel  495: 
1.443     foxr      496: # Keep these mappings in sync with lonquickgrades, which usesthe colors
1.416     jms       497: # instead of the icons.
                    498: my %statusIconMap = 
                    499:     (
                    500:      $resObj->CLOSED       => '',
                    501:      $resObj->OPEN         => 'navmap.open.gif',
                    502:      $resObj->CORRECT      => 'navmap.correct.gif',
                    503:      $resObj->PARTIALLY_CORRECT      => 'navmap.partial.gif',
                    504:      $resObj->INCORRECT    => 'navmap.wrong.gif',
                    505:      $resObj->ATTEMPTED    => 'navmap.ellipsis.gif',
                    506:      $resObj->ERROR        => ''
                    507:      );
1.401     albertel  508: 
1.438     wenzelju  509: my %iconAltTags =   #texthash does not work here
1.439     wenzelju  510:     ( 'navmap.correct.gif'  => 'Correct',
                    511:       'navmap.wrong.gif'    => 'Incorrect',
                    512:       'navmap.open.gif'     => 'Open',
                    513:       'navmap.partial.gif'  => 'Partially Correct',
                    514:       'navmap.ellipsis.gif' => 'Attempted',
                    515:      );
1.401     albertel  516: 
1.416     jms       517: # Defines a status->color mapping, null string means don't color
                    518: my %colormap = 
                    519:     ( $resObj->NETWORK_FAILURE        => '',
                    520:       $resObj->CORRECT                => '',
                    521:       $resObj->EXCUSED                => '#3333FF',
                    522:       $resObj->PAST_DUE_ANSWER_LATER  => '',
                    523:       $resObj->PAST_DUE_NO_ANSWER     => '',
                    524:       $resObj->ANSWER_OPEN            => '#006600',
                    525:       $resObj->OPEN_LATER             => '',
                    526:       $resObj->TRIES_LEFT             => '',
                    527:       $resObj->INCORRECT              => '',
                    528:       $resObj->OPEN                   => '',
                    529:       $resObj->NOTHING_SET            => '',
1.444.2.2  raeburn   530:       $resObj->CREDIT_ATTEMPTED       => '',
1.416     jms       531:       $resObj->ATTEMPTED              => '',
                    532:       $resObj->ANSWER_SUBMITTED       => '',
                    533:       $resObj->PARTIALLY_CORRECT      => '#006600'
                    534:       );
                    535: # And a special case in the nav map; what to do when the assignment
                    536: # is not yet done and due in less than 24 hours
                    537: my $hurryUpColor = "#FF0000";
1.174     albertel  538: 
1.432     raeburn   539: my $future_slots_checked = 0;
                    540: my $future_slots = 0;
                    541: 
1.416     jms       542: sub close {
                    543:     if ($env{'environment.remotenavmap'} ne 'on') { return ''; }
                    544:     return(<<ENDCLOSE);
                    545: <script type="text/javascript">
                    546: window.status='Accessing Nav Control';
                    547: menu=window.open("/adm/rat/empty.html","loncapanav",
                    548:                  "height=600,width=400,scrollbars=1");
                    549: window.status='Closing Nav Control';
                    550: menu.close();
                    551: window.status='Done.';
                    552: </script>
                    553: ENDCLOSE
                    554: }
1.174     albertel  555: 
1.416     jms       556: sub update {
                    557:     if ($env{'environment.remotenavmap'} ne 'on') { return ''; }
                    558:     if (!$env{'request.course.id'}) { return ''; }
                    559:     if ($ENV{'REQUEST_URI'}=~m|^/adm/navmaps|) { return ''; }
                    560:     return(<<ENDUPDATE);
                    561: <form name="navform"></form>
                    562: <script type="text/javascript">
                    563: this.document.navform.action='/adm/navmaps#curloc';
                    564: this.document.navform.target='loncapanav';
                    565: this.document.navform.submit();
                    566: </script>
                    567: ENDUPDATE
                    568: }
1.174     albertel  569: 
1.417     jms       570: 
1.416     jms       571: sub addToFilter {
                    572:     my $hashIn = shift;
                    573:     my $addition = shift;
                    574:     my %hash = %$hashIn;
                    575:     $hash{$addition} = 1;
1.174     albertel  576: 
1.416     jms       577:     return join (",", keys(%hash));
                    578: }
1.174     albertel  579: 
1.416     jms       580: sub removeFromFilter {
                    581:     my $hashIn = shift;
                    582:     my $subtraction = shift;
                    583:     my %hash = %$hashIn;
1.174     albertel  584: 
1.416     jms       585:     delete $hash{$subtraction};
                    586:     return join(",", keys(%hash));
                    587: }
1.174     albertel  588: 
1.416     jms       589: sub getLinkForResource {
                    590:     my $stack = shift;
                    591:     my $res;
1.174     albertel  592: 
1.416     jms       593:     # Check to see if there are any pages in the stack
                    594:     foreach $res (@$stack) {
                    595:         if (defined($res)) {
                    596: 	    my $anchor;
                    597: 	    if ($res->is_page()) {
                    598: 		foreach my $item (@$stack) { if (defined($item)) { $anchor = $item; }  }
                    599: 		$anchor=&escape($anchor->shown_symb());
                    600: 		return ($res->link(),$res->shown_symb(),$anchor);
                    601: 	    }
                    602:             # in case folder was skipped over as "only sequence"
                    603: 	    my ($map,$id,$src)=&Apache::lonnet::decode_symb($res->symb());
                    604: 	    if ($map=~/\.page$/) {
                    605: 		my $url=&Apache::lonnet::clutter($map);
1.437     foxr      606: 		$anchor=&escape($res->shown_symb());
1.416     jms       607: 		return ($url,$res->shown_symb(),$anchor);
                    608: 	    }
                    609:         }
                    610:     }
1.174     albertel  611: 
1.416     jms       612:     # Failing that, return the src of the last resource that is defined
                    613:     # (when we first recurse on a map, it puts an undefined resource
                    614:     # on the bottom because $self->{HERE} isn't defined yet, and we
                    615:     # want the src for the map anyhow)
                    616:     foreach my $item (@$stack) {
                    617:         if (defined($item)) { $res = $item; }
                    618:     }
1.174     albertel  619: 
1.416     jms       620:     if ($res) {
                    621: 	return ($res->link(),$res->shown_symb());
                    622:     }
                    623:     return;
                    624: }
1.174     albertel  625: 
1.417     jms       626: 
1.140     bowersj2  627: 
1.416     jms       628: sub getDescription {
                    629:     my $res = shift;
                    630:     my $part = shift;
                    631:     my $status = $res->status($part);
1.92      bowersj2  632: 
1.416     jms       633:     my $open = $res->opendate($part);
                    634:     my $due = $res->duedate($part);
                    635:     my $answer = $res->answerdate($part);
1.164     bowersj2  636: 
1.416     jms       637:     if ($status == $res->NETWORK_FAILURE) { 
                    638:         return &mt("Having technical difficulties; please check status later"); 
                    639:     }
                    640:     if ($status == $res->NOTHING_SET) {
                    641:         return &mt("Not currently assigned.");
                    642:     }
                    643:     if ($status == $res->OPEN_LATER) {
                    644:         return &mt("Open ") .timeToHumanString($open,'start');
                    645:     }
1.432     raeburn   646:     if ($res->simpleStatus($part) == $res->OPEN) {
                    647:         unless (&Apache::lonnet::allowed('mgr',$env{'request.course.id'})) {
                    648:             my ($slot_status,$slot_time,$slot_name)=$res->check_for_slot($part);
                    649:             if ($slot_status == $res->UNKNOWN) {
                    650:                 return &mt('Reservation status unknown');
                    651:             } elsif ($slot_status == $res->RESERVED) {
1.433     bisitz    652:                 return &mt('Reserved - ends [_1]',
                    653:                            timeToHumanString($slot_time,'end'));
1.432     raeburn   654:             } elsif ($slot_status == $res->RESERVED_LOCATION) {
1.433     bisitz    655:                 return &mt('Reserved - specific location(s) - ends [_1]',
                    656:                            timeToHumanString($slot_time,'end'));
1.432     raeburn   657:             } elsif ($slot_status == $res->RESERVED_LATER) {
1.433     bisitz    658:                 return &mt('Reserved - next open [_1]',
                    659:                            timeToHumanString($slot_time,'start'));
1.432     raeburn   660:             } elsif ($slot_status == $res->RESERVABLE) {
1.433     bisitz    661:                 return &mt('Reservable ending [_1]',
                    662:                            timeToHumanString($slot_time,'end'));
1.432     raeburn   663:             } elsif ($slot_status == $res->RESERVABLE_LATER) {
1.433     bisitz    664:                 return &mt('Reservable starting [_1]',
                    665:                            timeToHumanString($slot_time,'start'));
1.432     raeburn   666:             } elsif ($slot_status == $res->NOT_IN_A_SLOT) {
                    667:                 return &mt('Reserve a time/place to work');
                    668:             } elsif ($slot_status == $res->NOTRESERVABLE) {
                    669:                 return &mt('Reservation not available');
                    670:             } elsif ($slot_status == $res->WAITING_FOR_GRADE) {
                    671:                 return &mt('Submission in grading queue');
                    672:             }
                    673:         }
                    674:     }
1.416     jms       675:     if ($status == $res->OPEN) {
                    676:         if ($due) {
                    677: 	    if ($res->is_practice()) {
                    678: 		return &mt("Closes ")."  " .timeToHumanString($due,'start');
                    679: 	    } else {
                    680: 		return &mt("Due")."  " .timeToHumanString($due,'end');
                    681: 	    }
                    682:         } else {
                    683:             return &mt("Open, no due date");
                    684:         }
                    685:     }
                    686:     if ($status == $res->PAST_DUE_ANSWER_LATER) {
                    687:         return &mt("Answer open")." " .timeToHumanString($answer,'start');
                    688:     }
                    689:     if ($status == $res->PAST_DUE_NO_ANSWER) {
                    690: 	if ($res->is_practice()) {
                    691: 	    return &mt("Closed")." " . timeToHumanString($due,'start');
                    692: 	} else {
                    693: 	    return &mt("Was due")." " . timeToHumanString($due,'end');
                    694: 	}
                    695:     }
                    696:     if (($status == $res->ANSWER_OPEN || $status == $res->PARTIALLY_CORRECT)
                    697: 	&& $res->handgrade($part) ne 'yes') {
                    698:         return &mt("Answer available");
                    699:     }
                    700:     if ($status == $res->EXCUSED) {
                    701:         return &mt("Excused by instructor");
                    702:     }
                    703:     if ($status == $res->ATTEMPTED) {
1.444     raeburn   704:         if ($res->is_anonsurvey($part) || $res->is_survey($part)) {
                    705:             return &mt("Survey submission recorded");
                    706:         } else {
                    707:             return &mt("Answer submitted, not yet graded");
                    708:         }
1.416     jms       709:     }
1.444.2.2  raeburn   710:     if ($status == $res->CREDIT_ATTEMPTED) {
                    711:         if ($res->is_anonsurvey($part) || $res->is_survey($part)) {
                    712:             return &mt("Credit for survey submission");
                    713:         }
                    714:     }
1.416     jms       715:     if ($status == $res->TRIES_LEFT) {
                    716:         my $tries = $res->tries($part);
                    717:         my $maxtries = $res->maxtries($part);
                    718:         my $triesString = "";
                    719:         if ($tries && $maxtries) {
1.422     raeburn   720:             $triesString = '<font size="-1"><i>('.&mt('[_1] of [quant,_2,try,tries] used',$tries,$maxtries).')</i></font>';
1.416     jms       721:             if ($maxtries > 1 && $maxtries - $tries == 1) {
                    722:                 $triesString = "<b>$triesString</b>";
                    723:             }
                    724:         }
                    725:         if ($due) {
                    726:             return &mt("Due")." " . timeToHumanString($due,'end') .
                    727:                 " $triesString";
                    728:         } else {
                    729:             return &mt("No due date")." $triesString";
                    730:         }
                    731:     }
                    732:     if ($status == $res->ANSWER_SUBMITTED) {
                    733:         return &mt('Answer submitted');
                    734:     }
                    735: }
1.92      bowersj2  736: 
1.51      bowersj2  737: 
1.416     jms       738: sub dueInLessThan24Hours {
                    739:     my $res = shift;
                    740:     my $part = shift;
                    741:     my $status = $res->status($part);
1.55      bowersj2  742: 
1.416     jms       743:     return ($status == $res->OPEN() ||
                    744:             $status == $res->TRIES_LEFT()) &&
                    745: 	    $res->duedate($part) && $res->duedate($part) < time()+(24*60*60) &&
                    746: 	    $res->duedate($part) > time();
                    747: }
1.84      bowersj2  748: 
1.417     jms       749: 
1.416     jms       750: sub lastTry {
                    751:     my $res = shift;
                    752:     my $part = shift;
1.115     bowersj2  753: 
1.416     jms       754:     my $tries = $res->tries($part);
                    755:     my $maxtries = $res->maxtries($part);
                    756:     return $tries && $maxtries && $maxtries > 1 &&
                    757:         $maxtries - $tries == 1 && $res->duedate($part) &&
                    758:         $res->duedate($part) > time();
                    759: }
1.55      bowersj2  760: 
1.51      bowersj2  761: 
1.416     jms       762: sub advancedUser {
                    763:     return $env{'request.role.adv'};
                    764: }
1.51      bowersj2  765: 
1.416     jms       766: sub timeToHumanString {
                    767:     my ($time,$type,$format) = @_;
1.153     bowersj2  768: 
1.416     jms       769:     # zero, '0' and blank are bad times
                    770:     if (!$time) {
                    771:         return &mt('never');
                    772:     }
                    773:     unless (&Apache::lonlocal::current_language()=~/^en/) {
                    774: 	return &Apache::lonlocal::locallocaltime($time);
                    775:     } 
                    776:     my $now = time();
1.174     albertel  777: 
1.416     jms       778:     # Positive = future
                    779:     my $delta = $time - $now;
1.190     bowersj2  780: 
1.416     jms       781:     my $minute = 60;
                    782:     my $hour = 60 * $minute;
                    783:     my $day = 24 * $hour;
                    784:     my $week = 7 * $day;
                    785:     my $inPast = 0;
1.190     bowersj2  786: 
1.416     jms       787:     # Logic in comments:
                    788:     # Is it now? (extremely unlikely)
                    789:     if ( $delta == 0 ) {
                    790:         return "this instant";
                    791:     }
1.174     albertel  792: 
1.416     jms       793:     if ($delta < 0) {
                    794:         $inPast = 1;
                    795:         $delta = -$delta;
                    796:     }
1.143     bowersj2  797: 
1.416     jms       798:     if ( $delta > 0 ) {
1.51      bowersj2  799: 
1.416     jms       800:         my $tense = $inPast ? " ago" : "";
                    801:         my $prefix = $inPast ? "" : "in ";
                    802:         
                    803:         # Less than a minute
                    804:         if ( $delta < $minute ) {
                    805:             if ($delta == 1) { return "${prefix}1 second$tense"; }
                    806:             return "$prefix$delta seconds$tense";
                    807:         }
1.51      bowersj2  808: 
1.416     jms       809:         # Less than an hour
                    810:         if ( $delta < $hour ) {
                    811:             # If so, use minutes
                    812:             my $minutes = floor($delta / 60);
                    813:             if ($minutes == 1) { return "${prefix}1 minute$tense"; }
                    814:             return "$prefix$minutes minutes$tense";
                    815:         }
                    816:         
                    817:         # Is it less than 24 hours away? If so,
                    818:         # display hours + minutes
                    819:         if ( $delta < $hour * 24) {
                    820:             my $hours = floor($delta / $hour);
                    821:             my $minutes = floor(($delta % $hour) / $minute);
                    822:             my $hourString = "$hours hours";
                    823:             my $minuteString = ", $minutes minutes";
                    824:             if ($hours == 1) {
                    825:                 $hourString = "1 hour";
                    826:             }
                    827:             if ($minutes == 1) {
                    828:                 $minuteString = ", 1 minute";
                    829:             }
                    830:             if ($minutes == 0) {
                    831:                 $minuteString = "";
                    832:             }
                    833:             return "$prefix$hourString$minuteString$tense";
                    834:         }
1.174     albertel  835: 
1.416     jms       836: 	my $dt = DateTime->from_epoch(epoch => $time)
                    837: 	                 ->set_time_zone(&Apache::lonlocal::gettimezone());
1.216     bowersj2  838: 
1.416     jms       839: 	# If there's a caller supplied format, use it.
1.145     bowersj2  840: 
1.416     jms       841: 	if ($format ne '') {
                    842: 	    my $timeStr = $dt->strftime($format);
                    843: 	    return $timeStr.' ('.$dt->time_zone_short_name().')';
                    844: 	}
1.216     bowersj2  845: 
1.416     jms       846:         # Less than 5 days away, display day of the week and
                    847:         # HH:MM
1.216     bowersj2  848: 
1.416     jms       849:         if ( $delta < $day * 5 ) {
                    850:             my $timeStr = $dt->strftime("%A, %b %e at %I:%M %P (%Z)");
                    851:             $timeStr =~ s/12:00 am/00:00/;
                    852:             $timeStr =~ s/12:00 pm/noon/;
                    853:             return ($inPast ? "last " : "this ") .
                    854:                 $timeStr;
                    855:         }
                    856:         
                    857: 	my $conjunction='on';
                    858: 	if ($type eq 'start') {
                    859: 	    $conjunction='at';
                    860: 	} elsif ($type eq 'end') {
                    861: 	    $conjunction='by';
                    862: 	}
                    863:         # Is it this year?
                    864: 	my $dt_now = DateTime->from_epoch(epoch => $now)
                    865: 	                     ->set_time_zone(&Apache::lonlocal::gettimezone());
                    866:         if ( $dt->year() == $dt_now->year()) {
                    867:             # Return on Month Day, HH:MM meridian
                    868:             my $timeStr = $dt->strftime("$conjunction %A, %b %e at %I:%M %P (%Z)");
                    869:             $timeStr =~ s/12:00 am/00:00/;
                    870:             $timeStr =~ s/12:00 pm/noon/;
                    871:             return $timeStr;
                    872:         }
1.59      bowersj2  873: 
1.416     jms       874:         # Not this year, so show the year
                    875:         my $timeStr = 
                    876: 	    $dt->strftime("$conjunction %A, %b %e %Y at %I:%M %P (%Z)");
                    877:         $timeStr =~ s/12:00 am/00:00/;
                    878:         $timeStr =~ s/12:00 pm/noon/;
                    879:         return $timeStr;
                    880:     }
                    881: }
1.59      bowersj2  882: 
                    883: 
1.133     bowersj2  884: sub resource { return 0; }
                    885: sub communication_status { return 1; }
                    886: sub quick_status { return 2; }
                    887: sub long_status { return 3; }
1.225     bowersj2  888: sub part_status_summary { return 4; }
1.51      bowersj2  889: 
1.133     bowersj2  890: sub render_resource {
                    891:     my ($resource, $part, $params) = @_;
1.51      bowersj2  892: 
1.133     bowersj2  893:     my $nonLinkedText = ''; # stuff after resource title not in link
1.51      bowersj2  894: 
1.134     bowersj2  895:     my $link = $params->{"resourceLink"};
1.306     foxr      896: 
                    897:     #  The URL part is not escaped at this point, but the symb is... 
                    898: 
1.134     bowersj2  899:     my $src = $resource->src();
                    900:     my $it = $params->{"iterator"};
1.133     bowersj2  901:     my $filter = $it->{FILTER};
                    902: 
                    903:     my $title = $resource->compTitle();
1.258     albertel  904: 
1.133     bowersj2  905:     my $partLabel = "";
                    906:     my $newBranchText = "";
1.298     albertel  907:     my $location=&Apache::loncommon::lonhttpdurl("/adm/lonIcons");
1.133     bowersj2  908:     # If this is a new branch, label it so
                    909:     if ($params->{'isNewBranch'}) {
1.429     droeschl  910:         $newBranchText = "<img src='$location/branch.gif' alt=".mt('Branch')." />";
1.51      bowersj2  911:     }
                    912: 
1.133     bowersj2  913:     # links to open and close the folder
1.306     foxr      914: 
1.427     droeschl  915:     my $whitespace = $location.'/whitespace_21.gif';
                    916:     my $linkopen = "<img src='$whitespace' alt='' />"."<a href=\"$link\">";
1.133     bowersj2  917:     my $linkclose = "</a>";
1.51      bowersj2  918: 
1.204     albertel  919:     # Default icon: unknown page
1.426     droeschl  920:     my $icon = "<img class=\"LC_contentImage\" src='$location/unknown.gif' alt='' />";
1.133     bowersj2  921:     
                    922:     if ($resource->is_problem()) {
1.192     bowersj2  923:         if ($part eq '0' || $params->{'condensed'}) {
1.426     droeschl  924: 	    $icon = '<img class="LC_contentImage" src="'.$location.'/';
1.389     albertel  925: 	    if ($resource->is_task()) {
                    926: 		$icon .= 'task.gif" alt="'.&mt('Task');
                    927: 	    } else {
                    928: 		$icon .= 'problem.gif" alt="'.&mt('Problem');
                    929: 	    }
1.426     droeschl  930: 	    $icon .='" />';
1.133     bowersj2  931:         } else {
                    932:             $icon = $params->{'indentString'};
                    933:         }
1.204     albertel  934:     } else {
1.426     droeschl  935: 	$icon = "<img class=\"LC_contentImage\" src='".&Apache::loncommon::icon($resource->src)."' alt='' />";
1.133     bowersj2  936:     }
1.51      bowersj2  937: 
1.133     bowersj2  938:     # Display the correct map icon to open or shut map
                    939:     if ($resource->is_map()) {
                    940:         my $mapId = $resource->map_pc();
                    941:         my $nowOpen = !defined($filter->{$mapId});
                    942:         if ($it->{CONDITION}) {
                    943:             $nowOpen = !$nowOpen;
                    944:         }
1.426     droeschl  945: 	
1.205     bowersj2  946: 	my $folderType = $resource->is_sequence() ? 'folder' : 'page';
1.362     www       947:         my $title=$resource->title;
1.426     droeschl  948: 		$title=~s/\"/\&qout;/g;
1.144     bowersj2  949:         if (!$params->{'resource_no_folder_link'}) {
1.205     bowersj2  950:             $icon = "navmap.$folderType." . ($nowOpen ? 'closed' : 'open') . '.gif';
1.426     droeschl  951:             $icon = "<img src='$location/arrow." . ($nowOpen ? 'closed' : 'open') . ".gif' alt='' />"
                    952:                     ."<img class=\"LC_contentImage\" src='$location/$icon' alt=\""
                    953:                     .($nowOpen ? &mt('Open Folder') : &mt('Close Folder')).' '.$title."\" />";			
1.349     foxr      954:             $linkopen = "<a href=\"" . $params->{'url'} . '?' . 
1.392     albertel  955:                 $params->{'queryString'} . '&amp;filter=';
1.144     bowersj2  956:             $linkopen .= ($nowOpen xor $it->{CONDITION}) ?
                    957:                 addToFilter($filter, $mapId) :
                    958:                 removeFromFilter($filter, $mapId);
1.392     albertel  959:             $linkopen .= "&amp;condition=" . $it->{CONDITION} . '&amp;hereType='
                    960:                 . $params->{'hereType'} . '&amp;here=' .
1.384     www       961:                 &escape($params->{'here'}) . 
1.392     albertel  962:                 '&amp;jump=' .
1.384     www       963:                 &escape($resource->symb()) . 
1.392     albertel  964:                 "&amp;folderManip=1\">";
1.306     foxr      965: 
1.144     bowersj2  966:         } else {
                    967:             # Don't allow users to manipulate folder
1.426     droeschl  968:             $icon = "navmap.$folderType." . ($nowOpen ? 'closed' : 'open') . '.gif';
1.427     droeschl  969:             $icon = "<img class=\"LC_space\" src='$whitespace' alt='' />"."<img class=\"LC_contentImage\" src='$location/$icon' alt=\"".($nowOpen ? &mt('Open Folder') : &mt('Close Folder')).' '.$title."\" />";
1.144     bowersj2  970: 
                    971:             $linkopen = "";
                    972:             $linkclose = "";
                    973:         }
1.133     bowersj2  974:     }
1.51      bowersj2  975: 
1.133     bowersj2  976:     if ($resource->randomout()) {
1.362     www       977:         $nonLinkedText .= ' <i>('.&mt('hidden').')</i> ';
1.133     bowersj2  978:     }
1.342     albertel  979:     if (!$resource->condval()) {
1.362     www       980:         $nonLinkedText .= ' <i>('.&mt('conditionally hidden').')</i> ';
1.342     albertel  981:     }
1.413     www       982:     if (($resource->is_practice()) && ($resource->is_raw_problem())) {
1.412     www       983:         $nonLinkedText .=' <font color="green"><b>'.&mt('not graded').'</b></font>';
                    984:     }
1.426     droeschl  985: 
1.133     bowersj2  986:     # We're done preparing and finally ready to start the rendering
1.426     droeschl  987:     my $result = '<td class="LC_middle">';
                    988:     my $newfolderType = $resource->is_sequence() ? 'folder' : 'page';
                    989: 	
1.140     bowersj2  990:     my $indentLevel = $params->{'indentLevel'};
                    991:     if ($newBranchText) { $indentLevel--; }
                    992: 
1.133     bowersj2  993:     # print indentation
1.140     bowersj2  994:     for (my $i = 0; $i < $indentLevel; $i++) {
1.133     bowersj2  995:         $result .= $params->{'indentString'};
1.84      bowersj2  996:     }
                    997: 
1.133     bowersj2  998:     # Decide what to display
                    999:     $result .= "$newBranchText$linkopen$icon$linkclose";
                   1000:     
                   1001:     my $curMarkerBegin = '';
                   1002:     my $curMarkerEnd = '';
1.51      bowersj2 1003: 
1.133     bowersj2 1004:     # Is this the current resource?
1.158     bowersj2 1005:     if (!$params->{'displayedHereMarker'} && 
                   1006:         $resource->symb() eq $params->{'here'} ) {
1.430     schulted 1007:         $curMarkerBegin = '<em>';
1.424     schulted 1008:         $curMarkerEnd = '</em>';
                   1009: 	$params->{'displayedHereMarker'} = 1;
1.51      bowersj2 1010:     }
                   1011: 
1.192     bowersj2 1012:     if ($resource->is_problem() && $part ne '0' && 
1.133     bowersj2 1013:         !$params->{'condensed'}) {
1.274     matthew  1014: 	my $displaypart=$resource->part_display($part);
1.363     albertel 1015:         $partLabel = " (".&mt('Part: [_1]', $displaypart).")";
1.384     www      1016: 	if ($link!~/\#/) { $link.='#'.&escape($part); }
1.133     bowersj2 1017:         $title = "";
1.51      bowersj2 1018:     }
                   1019: 
1.163     bowersj2 1020:     if ($params->{'condensed'} && $resource->countParts() > 1) {
1.363     albertel 1021:         $nonLinkedText .= ' ('.&mt('[_1] parts', $resource->countParts()).')';
1.51      bowersj2 1022:     }
                   1023: 
1.268     albertel 1024:     my $target;
1.320     albertel 1025:     if ($env{'environment.remotenavmap'} eq 'on') {
1.268     albertel 1026: 	$target=' target="loncapaclient" ';
                   1027:     }
1.266     raeburn  1028:     if (!$params->{'resource_nolink'} && !$resource->is_sequence() && !$resource->is_empty_sequence) {
1.426     droeschl 1029:         $result .= "$curMarkerBegin<a $target href=\"$link\">$title$partLabel</a>$curMarkerEnd$nonLinkedText</td>";
1.144     bowersj2 1030:     } else {
1.426     droeschl 1031:         $result .= "$curMarkerBegin$linkopen$title$partLabel</a>$curMarkerEnd$nonLinkedText</td>";
1.144     bowersj2 1032:     }
1.51      bowersj2 1033: 
1.133     bowersj2 1034:     return $result;
                   1035: }
1.51      bowersj2 1036: 
1.133     bowersj2 1037: sub render_communication_status {
                   1038:     my ($resource, $part, $params) = @_;
1.134     bowersj2 1039:     my $discussionHTML = ""; my $feedbackHTML = ""; my $errorHTML = "";
                   1040: 
                   1041:     my $link = $params->{"resourceLink"};
1.335     albertel 1042:     my $target;
                   1043:     if ($env{'environment.remotenavmap'} eq 'on') {
                   1044: 	$target=' target="loncapaclient" ';
                   1045:     }
1.349     foxr     1046:     my $linkopen = "<a $target href=\"$link\">";
1.134     bowersj2 1047:     my $linkclose = "</a>";
1.298     albertel 1048:     my $location=&Apache::loncommon::lonhttpdurl("/adm/lonMisc");
1.134     bowersj2 1049:     if ($resource->hasDiscussion()) {
                   1050:         $discussionHTML = $linkopen .
1.442     wenzelju 1051:             '<img alt="'.&mt('New Discussion').'" src="'.$location.'/chat.gif" title="'.&mt('New Discussion').'"/>' .
1.134     bowersj2 1052:             $linkclose;
                   1053:     }
                   1054:     
                   1055:     if ($resource->getFeedback()) {
                   1056:         my $feedback = $resource->getFeedback();
1.394     raeburn  1057:         foreach my $msgid (split(/\,/, $feedback)) {
                   1058:             if ($msgid) {
1.335     albertel 1059:                 $feedbackHTML .= '&nbsp;<a '.$target.' href="/adm/email?display='
1.394     raeburn  1060:                     . &escape($msgid) . '">'
1.442     wenzelju 1061:                     . '<img alt="'.&mt('New E-mail').'" src="'.$location.'/feedback.gif" title="'.&mt('New E-mail').'"/></a>';
1.134     bowersj2 1062:             }
                   1063:         }
                   1064:     }
                   1065:     
                   1066:     if ($resource->getErrors()) {
                   1067:         my $errors = $resource->getErrors();
1.254     matthew  1068:         my $errorcount = 0;
1.394     raeburn  1069:         foreach my $msgid (split(/,/, $errors)) {
1.254     matthew  1070:             last if ($errorcount>=10); # Only output 10 bombs maximum
1.394     raeburn  1071:             if ($msgid) {
1.254     matthew  1072:                 $errorcount++;
1.335     albertel 1073:                 $errorHTML .= '&nbsp;<a '.$target.' href="/adm/email?display='
1.394     raeburn  1074:                     . &escape($msgid) . '">'
1.442     wenzelju 1075:                     . '<img alt="'.&mt('New Error').'" src="'.$location.'/bomb.gif" title="'.&mt('New Error').'"/></a>';
1.134     bowersj2 1076:             }
                   1077:         }
1.197     bowersj2 1078:     }
                   1079: 
                   1080:     if ($params->{'multipart'} && $part != '0') {
                   1081: 	$discussionHTML = $feedbackHTML = $errorHTML = '';
1.134     bowersj2 1082:     }
1.426     droeschl 1083:     return "<td class=\"LC_middle\">$discussionHTML$feedbackHTML$errorHTML&nbsp;</td>";
1.134     bowersj2 1084: 
1.133     bowersj2 1085: }
                   1086: sub render_quick_status {
                   1087:     my ($resource, $part, $params) = @_;
1.135     bowersj2 1088:     my $result = "";
                   1089:     my $firstDisplayed = !$params->{'condensed'} && 
                   1090:         $params->{'multipart'} && $part eq "0";
                   1091: 
                   1092:     my $link = $params->{"resourceLink"};
1.335     albertel 1093:     my $target;
                   1094:     if ($env{'environment.remotenavmap'} eq 'on') {
                   1095: 	$target=' target="loncapaclient" ';
                   1096:     }
1.349     foxr     1097:     my $linkopen = "<a $target href=\"$link\">";
1.135     bowersj2 1098:     my $linkclose = "</a>";
1.426     droeschl 1099: 	
                   1100: 	$result .= '<td class="LC_middle">';
1.135     bowersj2 1101:     if ($resource->is_problem() &&
                   1102:         !$firstDisplayed) {
1.224     bowersj2 1103:         my $icon = $statusIconMap{$resource->simpleStatus($part)};
1.135     bowersj2 1104:         my $alt = $iconAltTags{$icon};
                   1105:         if ($icon) {
1.298     albertel 1106: 	    my $location=
                   1107: 		&Apache::loncommon::lonhttpdurl("/adm/lonIcons/$icon");
1.438     wenzelju 1108: 		$result .= $linkopen.'<img src="'.$location.'" alt="'.&mt($alt).'" title="'.&mt($alt).'" />'.$linkclose;            
1.135     bowersj2 1109:         } else {
1.426     droeschl 1110:             $result .= "&nbsp;";
1.135     bowersj2 1111:         }
                   1112:     } else { # not problem, no icon
1.426     droeschl 1113:         $result .= "&nbsp;";
1.135     bowersj2 1114:     }
1.426     droeschl 1115: 	$result .= "</td>\n";
1.135     bowersj2 1116:     return $result;
1.133     bowersj2 1117: }
                   1118: sub render_long_status {
                   1119:     my ($resource, $part, $params) = @_;
1.426     droeschl 1120:     my $result = '<td class="LC_middle LC_right">';
1.136     bowersj2 1121:     my $firstDisplayed = !$params->{'condensed'} && 
                   1122:         $params->{'multipart'} && $part eq "0";
                   1123:                 
                   1124:     my $color;
1.402     albertel 1125:     if ($resource->is_problem() || $resource->is_practice()) {
1.136     bowersj2 1126:         $color = $colormap{$resource->status};
                   1127:         
1.252     matthew  1128:         if (dueInLessThan24Hours($resource, $part) ||
1.136     bowersj2 1129:             lastTry($resource, $part)) {
                   1130:             $color = $hurryUpColor;
                   1131:         }
                   1132:     }
                   1133:     
                   1134:     if ($resource->kind() eq "res" &&
1.402     albertel 1135:         ($resource->is_problem() || $resource->is_practice()) &&
1.136     bowersj2 1136:         !$firstDisplayed) {
                   1137:         if ($color) {$result .= "<font color=\"$color\"><b>"; }
                   1138:         $result .= getDescription($resource, $part);
                   1139:         if ($color) {$result .= "</b></font>"; }
                   1140:     }
1.402     albertel 1141:     if ($resource->is_map() && &advancedUser() && $resource->randompick()) {
1.400     albertel 1142:         $result .= &mt('(randomly select [_1])', $resource->randompick());
                   1143:     }
                   1144:     if ($resource->is_map() && &advancedUser() && $resource->randomorder()) {
                   1145:         $result .= &mt('(randomly ordered)');
1.136     bowersj2 1146:     }
1.210     bowersj2 1147: 
1.213     bowersj2 1148:     # Debugging code
                   1149:     #$result .= " " . $resource->awarded($part) . '/' . $resource->weight($part) .
                   1150:     #	' - Part: ' . $part;
                   1151: 
1.210     bowersj2 1152:     $result .= "</td>\n";
1.136     bowersj2 1153:     
                   1154:     return $result;
1.51      bowersj2 1155: }
                   1156: 
1.227     bowersj2 1157: # Colors obtained by taking the icons, matching the colors, and
                   1158: # possibly reducing the Value (HSV) of the color, if it's too bright
                   1159: # for text, generally by one third or so.
1.225     bowersj2 1160: my %statusColors = 
                   1161:     (
                   1162:      $resObj->CLOSED => '#000000',
1.227     bowersj2 1163:      $resObj->OPEN   => '#998b13',
                   1164:      $resObj->CORRECT => '#26933f',
                   1165:      $resObj->INCORRECT => '#c48207',
                   1166:      $resObj->ATTEMPTED => '#a87510',
1.225     bowersj2 1167:      $resObj->ERROR => '#000000'
                   1168:      );
                   1169: my %statusStrings = 
                   1170:     (
                   1171:      $resObj->CLOSED => 'Not yet open',
                   1172:      $resObj->OPEN   => 'Open',
                   1173:      $resObj->CORRECT => 'Correct',
                   1174:      $resObj->INCORRECT => 'Incorrect',
                   1175:      $resObj->ATTEMPTED => 'Attempted',
                   1176:      $resObj->ERROR => 'Network Error'
                   1177:      );
                   1178: my @statuses = ($resObj->CORRECT, $resObj->ATTEMPTED, $resObj->INCORRECT, $resObj->OPEN, $resObj->CLOSED, $resObj->ERROR);
                   1179: 
                   1180: sub render_parts_summary_status {
                   1181:     my ($resource, $part, $params) = @_;
1.256     albertel 1182:     if (!$resource->is_problem() && !$resource->contains_problem) { return '<td></td>'; }
1.225     bowersj2 1183:     if ($params->{showParts}) { 
                   1184: 	return '<td></td>';
                   1185:     }
                   1186: 
                   1187:     my $td = "<td align='right'>\n";
                   1188:     my $endtd = "</td>\n";
1.256     albertel 1189:     my @probs;
1.225     bowersj2 1190: 
1.256     albertel 1191:     if ($resource->contains_problem) {
                   1192: 	@probs=$resource->retrieveResources($resource,sub { $_[0]->is_problem() },1,0);
                   1193:     } else {
                   1194: 	@probs=($resource);
                   1195:     }
                   1196:     my $return;
                   1197:     my %overallstatus;
                   1198:     my $totalParts;
                   1199:     foreach my $resource (@probs) {
                   1200: 	# If there is a single part, just show the simple status
                   1201: 	if ($resource->singlepart()) {
                   1202: 	    my $status = $resource->simpleStatus(${$resource->parts}[0]);
                   1203: 	    $overallstatus{$status}++;
                   1204: 	    $totalParts++;
                   1205: 	    next;
                   1206: 	}
                   1207: 	# Now we can be sure the $part doesn't really matter.
                   1208: 	my $statusCount = $resource->simpleStatusCount();
                   1209: 	my @counts;
                   1210: 	foreach my $status (@statuses) {
                   1211: 	    # decouple display order from the simpleStatusCount order
                   1212: 	    my $slot = Apache::lonnavmaps::resource::statusToSlot($status);
                   1213: 	    if ($statusCount->[$slot]) {
                   1214: 		$overallstatus{$status}+=$statusCount->[$slot];
                   1215: 		$totalParts+=$statusCount->[$slot];
                   1216: 	    }
                   1217: 	}
                   1218:     }
                   1219:     $return.= $td . $totalParts . ' parts: ';
                   1220:     foreach my $status (@statuses) {
                   1221: 	if ($overallstatus{$status}) {
                   1222: 	    $return.="<font color='" . $statusColors{$status} .
                   1223: 		"'>" . $overallstatus{$status} . ' '
1.225     bowersj2 1224: 		. $statusStrings{$status} . "</font>";
                   1225: 	}
                   1226:     }
1.256     albertel 1227:     $return.= $endtd;
                   1228:     return $return;
1.225     bowersj2 1229: }
                   1230: 
1.133     bowersj2 1231: my @preparedColumns = (\&render_resource, \&render_communication_status,
1.225     bowersj2 1232:                        \&render_quick_status, \&render_long_status,
                   1233: 		       \&render_parts_summary_status);
1.132     bowersj2 1234: 
                   1235: sub setDefault {
                   1236:     my ($val, $default) = @_;
                   1237:     if (!defined($val)) { return $default; }
                   1238:     return $val;
                   1239: }
                   1240: 
1.296     albertel 1241: sub cmp_title {
                   1242:     my ($atitle,$btitle) = (lc($_[0]->compTitle),lc($_[1]->compTitle));
                   1243:     $atitle=~s/^\s*//;
                   1244:     $btitle=~s/^\s*//;
                   1245:     return $atitle cmp $btitle;
                   1246: }
                   1247: 
1.132     bowersj2 1248: sub render {
                   1249:     my $args = shift;
1.140     bowersj2 1250:     &Apache::loncommon::get_unprocessed_cgi($ENV{QUERY_STRING});
                   1251:     my $result = '';
1.132     bowersj2 1252:     # Configure the renderer.
                   1253:     my $cols = $args->{'cols'};
                   1254:     if (!defined($cols)) {
                   1255:         # no columns, no nav maps.
                   1256:         return '';
                   1257:     }
1.140     bowersj2 1258:     my $navmap;
                   1259:     if (defined($args->{'navmap'})) {
                   1260:         $navmap = $args->{'navmap'};
                   1261:     }
                   1262: 
1.158     bowersj2 1263:     my $r = $args->{'r'};
1.140     bowersj2 1264:     my $queryString = $args->{'queryString'};
1.159     bowersj2 1265:     my $jump = $args->{'jump'};
1.158     bowersj2 1266:     my $here = $args->{'here'};
1.153     bowersj2 1267:     my $suppressNavmap = setDefault($args->{'suppressNavmap'}, 0);
1.256     albertel 1268:     my $closeAllPages = setDefault($args->{'closeAllPages'}, 0);
1.140     bowersj2 1269:     my $currentJumpDelta = 2; # change this to change how many resources are displayed
                   1270:                              # before the current resource when using #current
                   1271: 
                   1272:     # If we were passed 'here' information, we are not rendering
                   1273:     # after a folder manipulation, and we were not passed an
                   1274:     # iterator, make sure we open the folders to show the "here"
                   1275:     # marker
                   1276:     my $filterHash = {};
                   1277:     # Figure out what we're not displaying
1.394     raeburn  1278:     foreach my $item (split(/\,/, $env{"form.filter"})) {
                   1279:         if ($item) {
                   1280:             $filterHash->{$item} = "1";
1.140     bowersj2 1281:         }
                   1282:     }
                   1283: 
1.191     bowersj2 1284:     # Filter: Remember filter function and add our own filter: Refuse
                   1285:     # to show hidden resources unless the user can see them.
                   1286:     my $userCanSeeHidden = advancedUser();
                   1287:     my $filterFunc = setDefault($args->{'filterFunc'},
                   1288:                                 sub {return 1;});
                   1289:     if (!$userCanSeeHidden) {
                   1290:         # Without renaming the filterfunc, the server seems to go into
                   1291:         # an infinite loop
                   1292:         my $oldFilterFunc = $filterFunc;
                   1293:         $filterFunc = sub { my $res = shift; return !$res->randomout() && 
                   1294:                                 &$oldFilterFunc($res);};
                   1295:     }
                   1296: 
1.140     bowersj2 1297:     my $condition = 0;
1.320     albertel 1298:     if ($env{'form.condition'}) {
1.140     bowersj2 1299:         $condition = 1;
                   1300:     }
                   1301: 
1.320     albertel 1302:     if (!$env{'form.folderManip'} && !defined($args->{'iterator'})) {
1.140     bowersj2 1303:         # Step 1: Check to see if we have a navmap
                   1304:         if (!defined($navmap)) {
1.221     bowersj2 1305:             $navmap = Apache::lonnavmaps::navmap->new();
1.340     albertel 1306: 	    if (!defined($navmap)) {
1.423     raeburn  1307: 		# no longer in course
1.388     albertel 1308: 		return '<span class="LC_error">'.&mt('No course selected').'</span><br />
1.362     www      1309:                         <a href="/adm/roles">'.&mt('Select a course').'</a><br />';
1.340     albertel 1310: 	    }
                   1311: 	}
1.140     bowersj2 1312: 
                   1313:         # Step two: Locate what kind of here marker is necessary
                   1314:         # Determine where the "here" marker is and where the screen jumps to.
                   1315: 
1.332     albertel 1316:         if ($env{'form.postsymb'} ne '') {
1.320     albertel 1317:             $here = $jump = &Apache::lonnet::symbclean($env{'form.postsymb'});
1.332     albertel 1318:         } elsif ($env{'form.postdata'} ne '') {
1.140     bowersj2 1319:             # couldn't find a symb, is there a URL?
1.320     albertel 1320:             my $currenturl = $env{'form.postdata'};
1.158     bowersj2 1321:             #$currenturl=~s/^http\:\/\///;
                   1322:             #$currenturl=~s/^[^\/]+//;
1.140     bowersj2 1323:             
1.158     bowersj2 1324:             $here = $jump = &Apache::lonnet::symbread($currenturl);
1.331     albertel 1325: 	}
                   1326: 	if ($here eq '') {
1.317     albertel 1327: 	    my $last;
1.320     albertel 1328: 	    if (tie(my %hash,'GDBM_File',$env{'request.course.fn'}.'_symb.db',
1.317     albertel 1329:                     &GDBM_READER(),0640)) {
                   1330: 		$last=$hash{'last_known'};
                   1331: 		untie(%hash);
                   1332: 	    }
                   1333: 	    if ($last) { $here = $jump = $last; }
                   1334: 	}
1.158     bowersj2 1335: 
1.140     bowersj2 1336:         # Step three: Ensure the folders are open
                   1337:         my $mapIterator = $navmap->getIterator(undef, undef, undef, 1);
1.222     bowersj2 1338:         my $curRes;
1.140     bowersj2 1339:         my $found = 0;
                   1340:         
                   1341:         # We only need to do this if we need to open the maps to show the
                   1342:         # current position. This will change the counter so we can't count
                   1343:         # for the jump marker with this loop.
1.294     albertel 1344:         while ($here && ($curRes = $mapIterator->next()) && !$found) {
1.158     bowersj2 1345:             if (ref($curRes) && $curRes->symb() eq $here) {
1.140     bowersj2 1346:                 my $mapStack = $mapIterator->getStack();
                   1347:                 
                   1348:                 # Ensure the parent maps are open
                   1349:                 for my $map (@{$mapStack}) {
                   1350:                     if ($condition) {
                   1351:                         undef $filterHash->{$map->map_pc()};
                   1352:                     } else {
                   1353:                         $filterHash->{$map->map_pc()} = 1;
                   1354:                     }
                   1355:                 }
                   1356:                 $found = 1;
                   1357:             }
                   1358:         }            
1.159     bowersj2 1359:     }        
1.140     bowersj2 1360: 
1.320     albertel 1361:     if ( !defined($args->{'iterator'}) && $env{'form.folderManip'} ) { # we came from a user's manipulation of the nav page
1.140     bowersj2 1362:         # If this is a click on a folder or something, we want to preserve the "here"
                   1363:         # from the querystring, and get the new "jump" marker
1.320     albertel 1364:         $here = $env{'form.here'};
                   1365:         $jump = $env{'form.jump'};
1.140     bowersj2 1366:     } 
                   1367:     
1.132     bowersj2 1368:     my $it = $args->{'iterator'};
                   1369:     if (!defined($it)) {
1.320     albertel 1370:         # Construct a default iterator based on $env{'form.'} information
1.140     bowersj2 1371:         
                   1372:         # Step 1: Check to see if we have a navmap
                   1373:         if (!defined($navmap)) {
1.221     bowersj2 1374:             $navmap = Apache::lonnavmaps::navmap->new();
1.423     raeburn  1375:             if (!defined($navmap)) {
                   1376:                 # no longer in course
                   1377:                 return '<span class="LC_error">'.&mt('No course selected').'</span><br />
                   1378:                         <a href="/adm/roles">'.&mt('Select a course').'</a><br />';
                   1379:             }
1.140     bowersj2 1380:         }
                   1381: 
1.144     bowersj2 1382:         # See if we're being passed a specific map
                   1383:         if ($args->{'iterator_map'}) {
                   1384:             my $map = $args->{'iterator_map'};
1.145     bowersj2 1385:             $map = $navmap->getResourceByUrl($map);
1.144     bowersj2 1386:             my $firstResource = $map->map_start();
                   1387:             my $finishResource = $map->map_finish();
                   1388: 
                   1389:             $args->{'iterator'} = $it = $navmap->getIterator($firstResource, $finishResource, $filterHash, $condition);
                   1390:         } else {
1.401     albertel 1391:             $args->{'iterator'} = $it = $navmap->getIterator(undef, undef, $filterHash, $condition,undef,$args->{'include_top_level_map'});
1.144     bowersj2 1392:         }
1.132     bowersj2 1393:     }
1.256     albertel 1394: 
1.159     bowersj2 1395:     # (re-)Locate the jump point, if any
1.191     bowersj2 1396:     # Note this does not take filtering or hidden into account... need
                   1397:     # to be fixed?
1.159     bowersj2 1398:     my $mapIterator = $navmap->getIterator(undef, undef, $filterHash, 0);
1.222     bowersj2 1399:     my $curRes;
1.159     bowersj2 1400:     my $foundJump = 0;
                   1401:     my $counter = 0;
                   1402:     
1.222     bowersj2 1403:     while (($curRes = $mapIterator->next()) && !$foundJump) {
1.159     bowersj2 1404:         if (ref($curRes)) { $counter++; }
                   1405:         
                   1406:         if (ref($curRes) && $jump eq $curRes->symb()) {
                   1407:             
                   1408:             # This is why we have to use the main iterator instead of the
                   1409:             # potentially faster DFS: The count has to be the same, so
                   1410:             # the order has to be the same, which DFS won't give us.
                   1411:             $args->{'currentJumpIndex'} = $counter;
                   1412:             $foundJump = 1;
                   1413:         }
                   1414:     }
                   1415: 
1.132     bowersj2 1416:     my $showParts = setDefault($args->{'showParts'}, 1);
                   1417:     my $condenseParts = setDefault($args->{'condenseParts'}, 1);
1.139     bowersj2 1418:     # keeps track of when the current resource is found,
                   1419:     # so we can back up a few and put the anchor above the
                   1420:     # current resource
1.140     bowersj2 1421:     my $printKey = $args->{'printKey'};
                   1422:     my $printCloseAll = $args->{'printCloseAll'};
                   1423:     if (!defined($printCloseAll)) { $printCloseAll = 1; }
1.425     schulted 1424:    
1.140     bowersj2 1425:     # Print key?
                   1426:     if ($printKey) {
                   1427:         $result .= '<table border="0" cellpadding="2" cellspacing="0">';
                   1428:         $result.='<tr><td align="right" valign="bottom">Key:&nbsp;&nbsp;</td>';
1.298     albertel 1429: 	my $location=&Apache::loncommon::lonhttpdurl("/adm/lonMisc");
1.140     bowersj2 1430:         if ($navmap->{LAST_CHECK}) {
                   1431:             $result .= 
1.434     bisitz   1432:                 '<img src="'.$location.'/chat.gif" alt="" /> '.&mt('New discussion since').' '.
1.140     bowersj2 1433:                 strftime("%A, %b %e at %I:%M %P", localtime($navmap->{LAST_CHECK})).
                   1434:                 '</td><td align="center" valign="bottom">&nbsp;&nbsp;'.
1.434     bisitz   1435:                 '<img src="'.$location.'/feedback.gif" alt="" /> '.&mt('New message (click to open)').'<p>'.
1.140     bowersj2 1436:                 '</td>'; 
                   1437:         } else {
                   1438:             $result .= '<td align="center" valign="bottom">&nbsp;&nbsp;'.
1.434     bisitz   1439:                 '<img src="'.$location.'/chat.gif" alt="" /> '.&mt('Discussions').'</td><td align="center" valign="bottom">'.
                   1440:                 '&nbsp;&nbsp;<img src="'.$location.'/feedback.gif" alt="" /> '.&mt('New message (click to open)').
1.140     bowersj2 1441:                 '</td>'; 
                   1442:         }
                   1443: 
                   1444:         $result .= '</tr></table>';
                   1445:     }
                   1446: 
1.172     bowersj2 1447:     if ($printCloseAll && !$args->{'resource_no_folder_link'}) {
1.281     albertel 1448: 	my ($link,$text);
1.140     bowersj2 1449:         if ($condition) {
1.444.2.1  raeburn  1450: 	    $link='navmaps?condition=0&amp;filter=&amp;'.$queryString.
1.444.2.2  raeburn  1451: 		'&amp;here='.&escape($here);
1.377     www      1452: 	    $text='Close all folders';
1.140     bowersj2 1453:         } else {
1.444.2.1  raeburn  1454: 	    $link='navmaps?condition=1&amp;filter=&amp;'.$queryString.
1.444.2.2  raeburn  1455: 		'&amp;here='.&escape($here);
1.377     www      1456: 	    $text='Open all folders';
1.281     albertel 1457:         }
1.444.2.1  raeburn  1458:         if ($env{'form.register'}) {
                   1459:             $link .= '&amp;register='.$env{'form.register'};
                   1460:         }
1.281     albertel 1461: 	if ($args->{'caller'} eq 'navmapsdisplay') {
                   1462: 	    &add_linkitem($args->{'linkitems'},'changefolder',
1.444.2.1  raeburn  1463:                           "location.href='$link'",$text);
1.281     albertel 1464: 	} else {
1.444.2.1  raeburn  1465:             $result.= '<a href="'.$link.'">'.&mt($text).'</a>';
1.281     albertel 1466: 	}
1.266     raeburn  1467:         $result .= "\n";
                   1468:     }
1.140     bowersj2 1469: 
1.266     raeburn  1470:     # Check for any unread discussions in all resources.
1.281     albertel 1471:     if ($args->{'caller'} eq 'navmapsdisplay') {
1.296     albertel 1472: 	&add_linkitem($args->{'linkitems'},'clearbubbles',
                   1473: 		      'document.clearbubbles.submit()',
                   1474: 		      'Mark all posts read');
1.297     albertel 1475: 	my $time=time;
1.296     albertel 1476: 	$result .= (<<END);
                   1477:     <form name="clearbubbles" method="post" action="/adm/feedback">
                   1478: 	<input type="hidden" name="navurl" value="$ENV{'QUERY_STRING'}" />
1.297     albertel 1479: 	<input type="hidden" name="navtime" value="$time" />
1.296     albertel 1480: END
1.444.2.1  raeburn  1481:         if ($env{'form.register'}) {
                   1482:             $result .= '<input type="hidden" name="register" value="'.$env{'form.register'}.'" />';
                   1483:         }
1.296     albertel 1484:         if ($args->{'sort'} eq 'discussion') { 
                   1485: 	    my $totdisc = 0;
                   1486: 	    my $haveDisc = '';
                   1487: 	    my @allres=$navmap->retrieveResources();
                   1488: 	    foreach my $resource (@allres) {
                   1489: 		if ($resource->hasDiscussion()) {
1.323     albertel 1490: 		    $haveDisc .= $resource->wrap_symb().':';
1.296     albertel 1491: 		    $totdisc ++;
1.267     albertel 1492: 		}
                   1493: 	    }
1.296     albertel 1494: 	    if ($totdisc > 0) {
                   1495: 		$haveDisc =~ s/:$//;
                   1496: 		$result .= (<<END);
                   1497: 	<input type="hidden" name="navmaps" value="$haveDisc" />
                   1498:     </form>
                   1499: END
                   1500:             }
1.297     albertel 1501: 	}
                   1502: 	$result.='</form>';
1.266     raeburn  1503:     }
1.276     albertel 1504: 
1.281     albertel 1505:     if ($args->{'caller'} eq 'navmapsdisplay') {
1.283     raeburn  1506:         $result .= '<table><tr><td>'.
1.444.2.3  raeburn  1507:                    &Apache::loncommon::help_open_menu('Navigation Screen','Navigation_Screen',undef,'RAT').'</td><td>&nbsp;</td>'.
                   1508:                    '<td class="LC_middle">'.&mt('Tools:').'</td>'.
                   1509:                    &show_linkitems_toolbar($args->{'linkitems'});
1.281     albertel 1510:         if ($args->{'sort_html'}) {
1.320     albertel 1511: 	    if ($env{'environment.remotenavmap'} ne 'on') {
1.444.2.3  raeburn  1512: 	        $result .= '<td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td>'.
                   1513:                            '<td align="right">'.$args->{'sort_html'}.'</td></tr>';
                   1514:             } else {
                   1515: 	        $result .= '</tr><tr><td align="left" colspan="4"><br />'.
                   1516:                            $args->{'sort_html'}.'</td></tr>';
                   1517:             }
                   1518:         } else {
                   1519:             $result .= '</tr>';
                   1520:         }
1.281     albertel 1521:         $result .= '</table>';
                   1522:     } elsif ($args->{'sort_html'}) { 
                   1523:         $result.=$args->{'sort_html'}; 
                   1524:     }
1.276     albertel 1525: 
1.425     schulted 1526:     #$result .= "<br />\n";
1.140     bowersj2 1527:     if ($r) {
                   1528:         $r->print($result);
                   1529:         $r->rflush();
                   1530:         $result = "";
                   1531:     }
1.132     bowersj2 1532:     # End parameter setting
1.425     schulted 1533:     
                   1534:     $result .= "<br />\n";
                   1535: 
1.132     bowersj2 1536:     # Data
1.431     schulted 1537:     $result.=&Apache::loncommon::start_data_table("LC_tableOfContent");    
1.426     droeschl 1538: 
1.132     bowersj2 1539:     my $res = "Apache::lonnavmaps::resource";
                   1540:     my %condenseStatuses =
                   1541:         ( $res->NETWORK_FAILURE    => 1,
                   1542:           $res->NOTHING_SET        => 1,
                   1543:           $res->CORRECT            => 1 );
1.133     bowersj2 1544: 
                   1545:     # Shared variables
                   1546:     $args->{'counter'} = 0; # counts the rows
                   1547:     $args->{'indentLevel'} = 0;
                   1548:     $args->{'isNewBranch'} = 0;
1.426     droeschl 1549:     $args->{'condensed'} = 0;   
                   1550: 
1.428     droeschl 1551:     my $location = &Apache::loncommon::lonhttpdurl("/adm/lonIcons/whitespace_21.gif");
1.426     droeschl 1552:     $args->{'indentString'} = setDefault($args->{'indentString'}, "<img src='$location' alt='' />");
1.133     bowersj2 1553:     $args->{'displayedHereMarker'} = 0;
1.132     bowersj2 1554: 
1.190     bowersj2 1555:     # If we're suppressing empty sequences, look for them here. Use DFS for speed,
                   1556:     # since structure actually doesn't matter, except what map has what resources.
                   1557:     if ($args->{'suppressEmptySequences'}) {
                   1558:         my $dfsit = Apache::lonnavmaps::DFSiterator->new($navmap,
                   1559:                                                          $it->{FIRST_RESOURCE},
                   1560:                                                          $it->{FINISH_RESOURCE},
                   1561:                                                          {}, undef, 1);
1.222     bowersj2 1562:         my $depth = 0;
1.190     bowersj2 1563:         $dfsit->next();
                   1564:         my $curRes = $dfsit->next();
                   1565:         while ($depth > -1) {
                   1566:             if ($curRes == $dfsit->BEGIN_MAP()) { $depth++; }
                   1567:             if ($curRes == $dfsit->END_MAP()) { $depth--; }
                   1568: 
                   1569:             if (ref($curRes)) { 
                   1570:                 # Parallel pre-processing: Do sequences have non-filtered-out children?
1.201     bowersj2 1571:                 if ($curRes->is_map()) {
1.190     bowersj2 1572:                     $curRes->{DATA}->{HAS_VISIBLE_CHILDREN} = 0;
                   1573:                     # Sequences themselves do not count as visible children,
                   1574:                     # unless those sequences also have visible children.
                   1575:                     # This means if a sequence appears, there's a "promise"
                   1576:                     # that there's something under it if you open it, somewhere.
                   1577:                 } else {
                   1578:                     # Not a sequence: if it's filtered, ignore it, otherwise
                   1579:                     # rise up the stack and mark the sequences as having children
                   1580:                     if (&$filterFunc($curRes)) {
                   1581:                         for my $sequence (@{$dfsit->getStack()}) {
                   1582:                             $sequence->{DATA}->{HAS_VISIBLE_CHILDREN} = 1;
                   1583:                         }
                   1584:                     }
                   1585:                 }
                   1586:             }
                   1587:         } continue {
                   1588:             $curRes = $dfsit->next();
                   1589:         }
                   1590:     }
                   1591: 
1.133     bowersj2 1592:     my $displayedJumpMarker = 0;
1.132     bowersj2 1593:     # Set up iteration.
                   1594:     my $now = time();
                   1595:     my $in24Hours = $now + 24 * 60 * 60;
                   1596:     my $rownum = 0;
                   1597: 
1.141     bowersj2 1598:     # export "here" marker information
                   1599:     $args->{'here'} = $here;
                   1600: 
1.222     bowersj2 1601:     $args->{'indentLevel'} = -1; # first BEGIN_MAP takes this to 0
1.270     albertel 1602:     my @resources;
                   1603:     my $code='';# sub { !(shift->is_map();) };
                   1604:     if ($args->{'sort'} eq 'title') {
1.276     albertel 1605:         my $oldFilterFunc = $filterFunc;
                   1606: 	my $filterFunc= 
                   1607: 	    sub {
                   1608: 		my ($res)=@_;
                   1609: 		if ($res->is_map()) { return 0;}
                   1610: 		return &$oldFilterFunc($res);
                   1611: 	    };
                   1612: 	@resources=$navmap->retrieveResources(undef,$filterFunc);
1.296     albertel 1613: 	@resources= sort { &cmp_title($a,$b) } @resources;
                   1614:     } elsif ($args->{'sort'} eq 'duedate') {
                   1615: 	my $oldFilterFunc = $filterFunc;
                   1616: 	my $filterFunc= 
                   1617: 	    sub {
                   1618: 		my ($res)=@_;
                   1619: 		if (!$res->is_problem()) { return 0;}
                   1620: 		return &$oldFilterFunc($res);
                   1621: 	    };
                   1622: 	@resources=$navmap->retrieveResources(undef,$filterFunc);
1.289     raeburn  1623: 	@resources= sort {
1.270     albertel 1624: 	    if ($a->duedate ne $b->duedate) {
                   1625: 	        return $a->duedate cmp $b->duedate;
                   1626: 	    }
1.296     albertel 1627: 	    my $value=&cmp_title($a,$b);
                   1628: 	    return $value;
1.270     albertel 1629: 	} @resources;
1.296     albertel 1630:     } elsif ($args->{'sort'} eq 'discussion') {
                   1631: 	my $oldFilterFunc = $filterFunc;
                   1632: 	my $filterFunc= 
                   1633: 	    sub {
                   1634: 		my ($res)=@_;
                   1635: 		if (!$res->hasDiscussion() &&
                   1636: 		    !$res->getFeedback() &&
                   1637: 		    !$res->getErrors()) { return 0;}
                   1638: 		return &$oldFilterFunc($res);
                   1639: 	    };
                   1640: 	@resources=$navmap->retrieveResources(undef,$filterFunc);
                   1641: 	@resources= sort { &cmp_title($a,$b) } @resources;
1.276     albertel 1642:     } else {
                   1643: 	#unknow sort mechanism or default
                   1644: 	undef($args->{'sort'});
1.270     albertel 1645:     }
                   1646: 
1.276     albertel 1647: 
1.270     albertel 1648:     while (1) {
                   1649: 	if ($args->{'sort'}) {
                   1650: 	    $curRes = shift(@resources);
                   1651: 	} else {
                   1652: 	    $curRes = $it->next($closeAllPages);
                   1653: 	}
                   1654: 	if (!$curRes) { last; }
                   1655: 
1.132     bowersj2 1656:         # Maintain indentation level.
                   1657:         if ($curRes == $it->BEGIN_MAP() ||
                   1658:             $curRes == $it->BEGIN_BRANCH() ) {
1.133     bowersj2 1659:             $args->{'indentLevel'}++;
1.132     bowersj2 1660:         }
                   1661:         if ($curRes == $it->END_MAP() ||
                   1662:             $curRes == $it->END_BRANCH() ) {
1.133     bowersj2 1663:             $args->{'indentLevel'}--;
1.132     bowersj2 1664:         }
                   1665:         # Notice new branches
                   1666:         if ($curRes == $it->BEGIN_BRANCH()) {
1.133     bowersj2 1667:             $args->{'isNewBranch'} = 1;
                   1668:         }
                   1669: 
                   1670:         # If this isn't an actual resource, continue on
                   1671:         if (!ref($curRes)) {
                   1672:             next;
1.132     bowersj2 1673:         }
1.133     bowersj2 1674: 
1.143     bowersj2 1675:         # If this has been filtered out, continue on
                   1676:         if (!(&$filterFunc($curRes))) {
                   1677:             $args->{'isNewBranch'} = 0; # Don't falsely remember this
                   1678:             next;
                   1679:         } 
1.132     bowersj2 1680: 
1.190     bowersj2 1681:         # If this is an empty sequence and we're filtering them, continue on
1.201     bowersj2 1682:         if ($curRes->is_map() && $args->{'suppressEmptySequences'} &&
1.190     bowersj2 1683:             !$curRes->{DATA}->{HAS_VISIBLE_CHILDREN}) {
                   1684:             next;
                   1685:         }
                   1686: 
1.153     bowersj2 1687:         # If we're suppressing navmaps and this is a navmap, continue on
                   1688:         if ($suppressNavmap && $curRes->src() =~ /^\/adm\/navmaps/) {
                   1689:             next;
                   1690:         }
                   1691: 
1.191     bowersj2 1692:         $args->{'counter'}++;
                   1693: 
1.132     bowersj2 1694:         # Does it have multiple parts?
1.133     bowersj2 1695:         $args->{'multipart'} = 0;
                   1696:         $args->{'condensed'} = 0;
1.132     bowersj2 1697:         my @parts;
                   1698:             
                   1699:         # Decide what parts to show.
1.133     bowersj2 1700:         if ($curRes->is_problem() && $showParts) {
1.132     bowersj2 1701:             @parts = @{$curRes->parts()};
1.192     bowersj2 1702:             $args->{'multipart'} = $curRes->multipart();
1.132     bowersj2 1703:             
                   1704:             if ($condenseParts) { # do the condensation
1.133     bowersj2 1705:                 if (!$args->{'condensed'}) {
1.132     bowersj2 1706:                     # Decide whether to condense based on similarity
1.192     bowersj2 1707:                     my $status = $curRes->status($parts[0]);
                   1708:                     my $due = $curRes->duedate($parts[0]);
                   1709:                     my $open = $curRes->opendate($parts[0]);
1.132     bowersj2 1710:                     my $statusAllSame = 1;
                   1711:                     my $dueAllSame = 1;
                   1712:                     my $openAllSame = 1;
1.192     bowersj2 1713:                     for (my $i = 1; $i < scalar(@parts); $i++) {
1.132     bowersj2 1714:                         if ($curRes->status($parts[$i]) != $status){
                   1715:                             $statusAllSame = 0;
                   1716:                         }
                   1717:                         if ($curRes->duedate($parts[$i]) != $due ) {
                   1718:                             $dueAllSame = 0;
                   1719:                         }
                   1720:                         if ($curRes->opendate($parts[$i]) != $open) {
                   1721:                             $openAllSame = 0;
                   1722:                         }
                   1723:                     }
                   1724:                     # $*allSame is true if all the statuses were
                   1725:                     # the same. Now, if they are all the same and
                   1726:                     # match one of the statuses to condense, or they
                   1727:                     # are all open with the same due date, or they are
                   1728:                     # all OPEN_LATER with the same open date, display the
                   1729:                     # status of the first non-zero part (to get the 'correct'
                   1730:                     # status right, since 0 is never 'correct' or 'open').
                   1731:                     if (($statusAllSame && defined($condenseStatuses{$status})) ||
                   1732:                         ($dueAllSame && $status == $curRes->OPEN && $statusAllSame)||
                   1733:                         ($openAllSame && $status == $curRes->OPEN_LATER && $statusAllSame) ){
1.192     bowersj2 1734:                         @parts = ($parts[0]);
1.133     bowersj2 1735:                         $args->{'condensed'} = 1;
1.132     bowersj2 1736:                     }
                   1737:                 }
1.198     bowersj2 1738: 		# Multipart problem with one part: always "condense" (happens
                   1739: 		#  to match the desirable behavior)
                   1740: 		if ($curRes->countParts() == 1) {
                   1741: 		    @parts = ($parts[0]);
                   1742: 		    $args->{'condensed'} = 1;
                   1743: 		}
1.132     bowersj2 1744:             }
1.157     bowersj2 1745:         } 
1.132     bowersj2 1746:             
                   1747:         # If the multipart problem was condensed, "forget" it was multipart
                   1748:         if (scalar(@parts) == 1) {
1.133     bowersj2 1749:             $args->{'multipart'} = 0;
1.192     bowersj2 1750:         } else {
                   1751:             # Add part 0 so we display it correctly.
                   1752:             unshift @parts, '0';
1.132     bowersj2 1753:         }
1.310     albertel 1754: 	
                   1755: 	{
                   1756: 	    my ($src,$symb,$anchor,$stack);
                   1757: 	    if ($args->{'sort'}) {
                   1758: 		my $it = $navmap->getIterator(undef, undef, undef, 1);
                   1759: 		while ( my $res=$it->next()) {
                   1760: 		    if (ref($res) &&
                   1761: 			$res->symb() eq  $curRes->symb()) { last; }
                   1762: 		}
                   1763: 		$stack=$it->getStack();
                   1764: 	    } else {
                   1765: 		$stack=$it->getStack();
                   1766: 	    }
                   1767: 	    ($src,$symb,$anchor)=getLinkForResource($stack);
                   1768: 	    if (defined($anchor)) { $anchor='#'.$anchor; }
                   1769: 	    my $srcHasQuestion = $src =~ /\?/;
                   1770: 	    $args->{"resourceLink"} = $src.
1.444.2.2  raeburn  1771: 		($srcHasQuestion?'&amp;':'?') .
1.384     www      1772: 		'symb=' . &escape($symb).$anchor;
1.310     albertel 1773: 	}
1.132     bowersj2 1774:         # Now, we've decided what parts to show. Loop through them and
                   1775:         # show them.
1.192     bowersj2 1776:         foreach my $part (@parts) {
1.132     bowersj2 1777:             $rownum ++;
                   1778:             
1.431     schulted 1779:             $result .= &Apache::loncommon::start_data_table_row();
1.134     bowersj2 1780: 
                   1781:             # Set up some data about the parts that the cols might want
                   1782:             my $filter = $it->{FILTER};
1.270     albertel 1783: 
1.132     bowersj2 1784:             # Now, display each column.
                   1785:             foreach my $col (@$cols) {
1.139     bowersj2 1786:                 my $colHTML = '';
                   1787:                 if (ref($col)) {
                   1788:                     $colHTML .= &$col($curRes, $part, $args);
                   1789:                 } else {
                   1790:                     $colHTML .= &{$preparedColumns[$col]}($curRes, $part, $args);
                   1791:                 }
1.132     bowersj2 1792: 
1.133     bowersj2 1793:                 # If this is the first column and it's time to print
                   1794:                 # the anchor, do so
                   1795:                 if ($col == $cols->[0] && 
                   1796:                     $args->{'counter'} == $args->{'currentJumpIndex'} - 
1.139     bowersj2 1797:                     $currentJumpDelta) {
                   1798:                     # Jam the anchor after the <td> tag;
                   1799:                     # necessary for valid HTML (which Mozilla requires)
                   1800:                     $colHTML =~ s/\>/\>\<a name="curloc" \/\>/;
1.133     bowersj2 1801:                     $displayedJumpMarker = 1;
                   1802:                 }
1.139     bowersj2 1803:                 $result .= $colHTML . "\n";
1.132     bowersj2 1804:             }
1.431     schulted 1805:             $result .= &Apache::loncommon::end_data_table_row();
1.140     bowersj2 1806:             $args->{'isNewBranch'} = 0;
1.139     bowersj2 1807:         }
1.153     bowersj2 1808: 
1.139     bowersj2 1809:         if ($r && $rownum % 20 == 0) {
                   1810:             $r->print($result);
                   1811:             $result = "";
                   1812:             $r->rflush();
1.132     bowersj2 1813:         }
1.156     bowersj2 1814:     } continue {
1.208     bowersj2 1815: 	if ($r) {
                   1816: 	    # If we have the connection, make sure the user is still connected
                   1817: 	    my $c = $r->connection;
                   1818: 	    if ($c->aborted()) {
                   1819: 		# Who cares what we do, nobody will see it anyhow.
                   1820: 		return '';
                   1821: 	    }
                   1822: 	}
1.132     bowersj2 1823:     }
                   1824:     
1.134     bowersj2 1825:     # Print out the part that jumps to #curloc if it exists
1.159     bowersj2 1826:     # delay needed because the browser is processing the jump before
                   1827:     # it finishes rendering, so it goes to the wrong place!
                   1828:     # onload might be better, but this routine has no access to that.
                   1829:     # On mozilla, the 0-millisecond timeout seems to prevent this;
                   1830:     # it's quite likely this might fix other browsers, too, and 
                   1831:     # certainly won't hurt anything.
1.139     bowersj2 1832:     if ($displayedJumpMarker) {
1.444.2.2  raeburn  1833:         $result .= &Apache::lonhtmlcommon::scripttag("
1.247     albertel 1834: if (location.href.indexOf('#curloc')==-1) {
                   1835:     setTimeout(\"location += '#curloc';\", 0)
                   1836: }
1.444.2.2  raeburn  1837: ");
1.134     bowersj2 1838:     }
                   1839: 
1.431     schulted 1840:     $result.=&Apache::loncommon::end_data_table();
                   1841: 
1.140     bowersj2 1842:     if ($r) {
                   1843:         $r->print($result);
                   1844:         $result = "";
                   1845:         $r->rflush();
                   1846:     }
                   1847:         
1.132     bowersj2 1848:     return $result;
                   1849: }
                   1850: 
1.281     albertel 1851: sub add_linkitem {
                   1852:     my ($linkitems,$name,$cmd,$text)=@_;
                   1853:     $$linkitems{$name}{'cmd'}=$cmd;
                   1854:     $$linkitems{$name}{'text'}=&mt($text);
                   1855: }
                   1856: 
1.430     schulted 1857: sub show_linkitems_toolbar {
                   1858:     my ($linkitems,$condition)=@_;
1.444.2.1  raeburn  1859:     my @linkorder = ("launchnav","closenav","firsthomework",
1.430     schulted 1860: 		     "everything","uncompleted","changefolder","clearbubbles");
1.444.2.1  raeburn  1861:     my $result .='<td align="left">'."\n".
                   1862:                  '<span class="LC_nobreak">'."\n".
                   1863:                  '<ul id="LC_toolbar">';
                   1864:     foreach my $link (@linkorder) {
                   1865:         my $link_id = 'LC_content_toolbar_'.$link;
                   1866:         if (defined($linkitems->{$link})) {
                   1867:             if ($linkitems->{$link}{'text'} ne '') {
                   1868:                 $linkitems->{$link}{'cmd'}=~s/"/'/g;
                   1869:                 if ($linkitems->{$link}{'cmd'}) {
                   1870:                     if ($link eq 'changefolder') {
                   1871:                         if ($condition) {
                   1872:                             $link_id='LC_content_toolbar_changefolder_toggled';
                   1873:                         } else {
                   1874:                             $link_id='LC_content_toolbar_changefolder';
                   1875:                         }
                   1876:                     }
                   1877:                     $result .= '<li><a href="#" '.
                   1878:                                'onclick="'.$linkitems->{$link}{'cmd'}.'" '.
                   1879:                                'id="'.$link_id.'" '.
                   1880:                                'class="LC_toolbarItem" '.
                   1881:                                'title="'.$linkitems->{$link}{'text'}.'">'.
                   1882:                                '</a></li>'."\n";
                   1883:                 }
                   1884:             }
                   1885:         }
1.430     schulted 1886:     }
1.444.2.1  raeburn  1887:     $result .= '</ul>'.
                   1888:                '</span></td>'."\n";
1.430     schulted 1889:     return $result;
                   1890: }
                   1891: 
                   1892: 
1.133     bowersj2 1893: 1;
                   1894: 
1.418     jms      1895: 
                   1896: 
                   1897: 
                   1898: 
                   1899: 
                   1900: 
                   1901: 
                   1902: 
1.133     bowersj2 1903: package Apache::lonnavmaps::navmap;
                   1904: 
                   1905: =pod
                   1906: 
1.216     bowersj2 1907: =head1 Object: Apache::lonnavmaps::navmap
1.133     bowersj2 1908: 
1.217     bowersj2 1909: =head2 Overview
1.133     bowersj2 1910: 
1.217     bowersj2 1911: The navmap object's job is to provide access to the resources
                   1912: in the course as Apache::lonnavmaps::resource objects, and to
                   1913: query and manage the relationship between those resource objects.
                   1914: 
                   1915: Generally, you'll use the navmap object in one of three basic ways.
                   1916: In order of increasing complexity and power:
                   1917: 
                   1918: =over 4
                   1919: 
1.358     albertel 1920: =item * C<$navmap-E<gt>getByX>, where X is B<Id>, B<Symb> or B<MapPc> and getResourceByUrl. This provides
1.217     bowersj2 1921:     various ways to obtain resource objects, based on various identifiers.
                   1922:     Use this when you want to request information about one object or 
                   1923:     a handful of resources you already know the identities of, from some
                   1924:     other source. For more about Ids, Symbs, and MapPcs, see the
                   1925:     Resource documentation. Note that Url should be a B<last resort>,
1.358     albertel 1926:     not your first choice; it only really works when there is only one
1.217     bowersj2 1927:     instance of the resource in the course, which only applies to
1.358     albertel 1928:     maps, and even that may change in the future (see the B<getResourceByUrl>
                   1929:     documentation for more details.)
1.217     bowersj2 1930: 
                   1931: =item * C<my @resources = $navmap-E<gt>retrieveResources(args)>. This
                   1932:     retrieves resources matching some criterion and returns them
                   1933:     in a flat array, with no structure information. Use this when
                   1934:     you are manipulating a series of resources, based on what map
                   1935:     the are in, but do not care about branching, or exactly how
                   1936:     the maps and resources are related. This is the most common case.
                   1937: 
                   1938: =item * C<$it = $navmap-E<gt>getIterator(args)>. This allows you traverse
                   1939:     the course's navmap in various ways without writing the traversal
                   1940:     code yourself. See iterator documentation below. Use this when
                   1941:     you need to know absolutely everything about the course, including
                   1942:     branches and the precise relationship between maps and resources.
                   1943: 
                   1944: =back
                   1945: 
                   1946: =head2 Creation And Destruction
                   1947: 
                   1948: To create a navmap object, use the following function:
1.133     bowersj2 1949: 
                   1950: =over 4
                   1951: 
1.221     bowersj2 1952: =item * B<Apache::lonnavmaps::navmap-E<gt>new>():
1.133     bowersj2 1953: 
1.221     bowersj2 1954: Creates a new navmap object. Returns the navmap object if this is
                   1955: successful, or B<undef> if not.
1.174     albertel 1956: 
1.216     bowersj2 1957: =back
                   1958: 
                   1959: =head2 Methods
                   1960: 
                   1961: =over 4
                   1962: 
1.174     albertel 1963: =item * B<getIterator>(first, finish, filter, condition):
                   1964: 
                   1965: See iterator documentation below.
1.133     bowersj2 1966: 
                   1967: =cut
                   1968: 
                   1969: use strict;
                   1970: use GDBM_File;
1.320     albertel 1971: use Apache::lonnet;
1.397     albertel 1972: use LONCAPA;
1.133     bowersj2 1973: 
                   1974: sub new {
                   1975:     # magic invocation to create a class instance
                   1976:     my $proto = shift;
                   1977:     my $class = ref($proto) || $proto;
                   1978:     my $self = {};
                   1979: 
                   1980:     # Resource cache stores navmap resources as we reference them. We generate
                   1981:     # them on-demand so we don't pay for creating resources unless we use them.
                   1982:     $self->{RESOURCE_CACHE} = {};
                   1983: 
                   1984:     # Network failure flag, if we accessed the course or user opt and
                   1985:     # failed
                   1986:     $self->{NETWORK_FAILURE} = 0;
                   1987: 
                   1988:     # tie the nav hash
                   1989: 
1.168     bowersj2 1990:     my %navmaphash;
                   1991:     my %parmhash;
1.320     albertel 1992:     my $courseFn = $env{"request.course.fn"};
1.220     bowersj2 1993:     if (!(tie(%navmaphash, 'GDBM_File', "${courseFn}.db",
1.133     bowersj2 1994:               &GDBM_READER(), 0640))) {
                   1995:         return undef;
                   1996:     }
                   1997:     
1.220     bowersj2 1998:     if (!(tie(%parmhash, 'GDBM_File', "${courseFn}_parms.db",
1.133     bowersj2 1999:               &GDBM_READER(), 0640)))
                   2000:     {
1.170     matthew  2001:         untie %{$self->{PARM_HASH}};
1.133     bowersj2 2002:         return undef;
                   2003:     }
                   2004: 
1.199     bowersj2 2005:     $self->{NAV_HASH} = \%navmaphash;
1.168     bowersj2 2006:     $self->{PARM_HASH} = \%parmhash;
1.221     bowersj2 2007:     $self->{PARM_CACHE} = {};
1.133     bowersj2 2008: 
                   2009:     bless($self);
                   2010:         
                   2011:     return $self;
                   2012: }
                   2013: 
1.221     bowersj2 2014: sub generate_course_user_opt {
1.133     bowersj2 2015:     my $self = shift;
1.221     bowersj2 2016:     if ($self->{COURSE_USER_OPT_GENERATED}) { return; }
1.133     bowersj2 2017: 
1.320     albertel 2018:     my $uname=$env{'user.name'};
                   2019:     my $udom=$env{'user.domain'};
                   2020:     my $cid=$env{'request.course.id'};
1.326     albertel 2021:     my $cdom=$env{'course.'.$cid.'.domain'};
                   2022:     my $cnum=$env{'course.'.$cid.'.num'};
1.221     bowersj2 2023:     
1.133     bowersj2 2024: # ------------------------------------------------- Get coursedata (if present)
1.326     albertel 2025:     my $courseopt=&Apache::lonnet::get_courseresdata($cnum,$cdom);
                   2026:     # Check for network failure
                   2027:     if (!ref($courseopt)) {
                   2028: 	if ( $courseopt =~ /no.such.host/i || $courseopt =~ /con_lost/i) {
1.324     albertel 2029: 	    $self->{NETWORK_FAILURE} = 1;
1.221     bowersj2 2030: 	}
1.326     albertel 2031: 	undef($courseopt);
                   2032:     }
1.325     albertel 2033: 
1.133     bowersj2 2034: # --------------------------------------------------- Get userdata (if present)
1.325     albertel 2035: 	
1.326     albertel 2036:     my $useropt=&Apache::lonnet::get_userresdata($uname,$udom);
                   2037:     # Check for network failure
                   2038:     if (!ref($useropt)) {
                   2039: 	if ( $useropt =~ /no.such.host/i || $useropt =~ /con_lost/i) {
1.324     albertel 2040: 	    $self->{NETWORK_FAILURE} = 1;
1.221     bowersj2 2041: 	}
1.326     albertel 2042: 	undef($useropt);
1.221     bowersj2 2043:     }
                   2044: 
1.326     albertel 2045:     $self->{COURSE_OPT} = $courseopt;
                   2046:     $self->{USER_OPT} = $useropt;
                   2047: 
1.221     bowersj2 2048:     $self->{COURSE_USER_OPT_GENERATED} = 1;
                   2049:     
                   2050:     return;
                   2051: }
                   2052: 
                   2053: sub generate_email_discuss_status {
                   2054:     my $self = shift;
1.259     raeburn  2055:     my $symb = shift;
1.221     bowersj2 2056:     if ($self->{EMAIL_DISCUSS_GENERATED}) { return; }
1.133     bowersj2 2057: 
1.320     albertel 2058:     my $cid=$env{'request.course.id'};
1.326     albertel 2059:     my $cdom=$env{'course.'.$cid.'.domain'};
                   2060:     my $cnum=$env{'course.'.$cid.'.num'};
1.221     bowersj2 2061:     
                   2062:     my %emailstatus = &Apache::lonnet::dump('email_status');
                   2063:     my $logoutTime = $emailstatus{'logout'};
1.320     albertel 2064:     my $courseLeaveTime = $emailstatus{'logout_'.$env{'request.course.id'}};
1.221     bowersj2 2065:     $self->{LAST_CHECK} = (($courseLeaveTime > $logoutTime) ?
                   2066: 			   $courseLeaveTime : $logoutTime);
                   2067:     my %discussiontime = &Apache::lonnet::dump('discussiontimes', 
                   2068: 					       $cdom, $cnum);
1.259     raeburn  2069:     my %lastread = &Apache::lonnet::dump('nohist_'.$cid.'_discuss',
1.320     albertel 2070:                                         $env{'user.domain'},$env{'user.name'},'lastread');
1.259     raeburn  2071:     my %lastreadtime = ();
1.394     raeburn  2072:     foreach my $key (keys %lastread) {
                   2073:         my $shortkey = $key;
                   2074:         $shortkey =~ s/_lastread$//;
                   2075:         $lastreadtime{$shortkey} = $lastread{$key};
1.259     raeburn  2076:     }
                   2077: 
1.221     bowersj2 2078:     my %feedback=();
                   2079:     my %error=();
1.325     albertel 2080:     my @keys = &Apache::lonnet::getkeys('nohist_email',$env{'user.domain'},
                   2081: 					$env{'user.name'});
1.221     bowersj2 2082:     
1.325     albertel 2083:     foreach my $msgid (@keys) {
1.295     albertel 2084: 	if ((!$emailstatus{$msgid}) || ($emailstatus{$msgid} eq 'new')) {
1.395     raeburn  2085:             my ($sendtime,$shortsubj,$fromname,$fromdomain,$status,$fromcid,
                   2086:                 $symb,$error) = &Apache::lonmsg::unpackmsgid($msgid);
1.396     raeburn  2087:             &Apache::lonenc::check_decrypt(\$symb); 
                   2088:             if (($fromcid ne '') && ($fromcid ne $cid)) {
                   2089:                 next;
                   2090:             }
1.395     raeburn  2091:             if (defined($symb)) {
                   2092:                 if (defined($error) && $error == 1) {
                   2093:                     $error{$symb}.=','.$msgid;
                   2094:                 } else {
                   2095:                     $feedback{$symb}.=','.$msgid;
                   2096:                 }
                   2097:             } else {
                   2098:                 my $plain=
                   2099:                     &LONCAPA::unescape(&LONCAPA::unescape($msgid));
                   2100:                 if ($plain=~/ \[([^\]]+)\]\:/) {
                   2101:                     my $url=$1;
                   2102:                     if ($plain=~/\:Error \[/) {
                   2103:                         $error{$url}.=','.$msgid;
                   2104:                     } else {
                   2105:                         $feedback{$url}.=','.$msgid;
                   2106:                     }
                   2107:                 }
                   2108:             }
1.221     bowersj2 2109: 	}
1.211     bowersj2 2110:     }
1.221     bowersj2 2111:     
1.395     raeburn  2112:     #symbs of resources that have feedbacks (will be urls pre-2.3)
1.221     bowersj2 2113:     $self->{FEEDBACK} = \%feedback;
1.395     raeburn  2114:     #or errors (will be urls pre 2.3)
1.295     albertel 2115:     $self->{ERROR_MSG} = \%error;
1.221     bowersj2 2116:     $self->{DISCUSSION_TIME} = \%discussiontime;
                   2117:     $self->{EMAIL_STATUS} = \%emailstatus;
1.259     raeburn  2118:     $self->{LAST_READ} = \%lastreadtime;
1.221     bowersj2 2119:     
                   2120:     $self->{EMAIL_DISCUSS_GENERATED} = 1;
                   2121: }
                   2122: 
                   2123: sub get_user_data {
                   2124:     my $self = shift;
                   2125:     if ($self->{RETRIEVED_USER_DATA}) { return; }
1.211     bowersj2 2126: 
1.221     bowersj2 2127:     # Retrieve performance data on problems
1.320     albertel 2128:     my %student_data = Apache::lonnet::currentdump($env{'request.course.id'},
                   2129: 						   $env{'user.domain'},
                   2130: 						   $env{'user.name'});
1.221     bowersj2 2131:     $self->{STUDENT_DATA} = \%student_data;
1.133     bowersj2 2132: 
1.221     bowersj2 2133:     $self->{RETRIEVED_USER_DATA} = 1;
1.133     bowersj2 2134: }
                   2135: 
1.354     raeburn  2136: sub get_discussion_data {
                   2137:     my $self = shift;
                   2138:     if ($self->{RETRIEVED_DISCUSSION_DATA}) {
1.366     albertel 2139: 	return $self->{DISCUSSION_DATA};
1.354     raeburn  2140:     }
1.366     albertel 2141: 
                   2142:     $self->generate_email_discuss_status();    
                   2143: 
1.354     raeburn  2144:     my $cid=$env{'request.course.id'};
                   2145:     my $cdom=$env{'course.'.$cid.'.domain'};
                   2146:     my $cnum=$env{'course.'.$cid.'.num'};
                   2147:     # Retrieve discussion data for resources in course
1.367     albertel 2148:     my %discussion_data = &Apache::lonnet::dumpstore($cid,$cdom,$cnum);
1.366     albertel 2149: 
                   2150: 
1.354     raeburn  2151:     $self->{DISCUSSION_DATA} = \%discussion_data;
                   2152:     $self->{RETRIEVED_DISCUSSION_DATA} = 1;
                   2153:     return $self->{DISCUSSION_DATA};
                   2154: }
                   2155: 
                   2156: 
1.133     bowersj2 2157: # Internal function: Takes a key to look up in the nav hash and implements internal
                   2158: # memory caching of that key.
                   2159: sub navhash {
                   2160:     my $self = shift; my $key = shift;
                   2161:     return $self->{NAV_HASH}->{$key};
                   2162: }
                   2163: 
1.217     bowersj2 2164: =pod
                   2165: 
                   2166: =item * B<courseMapDefined>(): Returns true if the course map is defined, 
                   2167:     false otherwise. Undefined course maps indicate an error somewhere in
                   2168:     LON-CAPA, and you will not be able to proceed with using the navmap.
                   2169:     See the B<NAV> screen for an example of using this.
                   2170: 
                   2171: =cut
                   2172: 
1.133     bowersj2 2173: # Checks to see if coursemap is defined, matching test in old lonnavmaps
                   2174: sub courseMapDefined {
                   2175:     my $self = shift;
1.320     albertel 2176:     my $uri = &Apache::lonnet::clutter($env{'request.course.uri'});
1.133     bowersj2 2177: 
                   2178:     my $firstres = $self->navhash("map_start_$uri");
                   2179:     my $lastres = $self->navhash("map_finish_$uri");
                   2180:     return $firstres && $lastres;
                   2181: }
                   2182: 
                   2183: sub getIterator {
                   2184:     my $self = shift;
                   2185:     my $iterator = Apache::lonnavmaps::iterator->new($self, shift, shift,
1.314     albertel 2186:                                                      shift, undef, shift,
                   2187: 						     shift, shift);
1.133     bowersj2 2188:     return $iterator;
                   2189: }
                   2190: 
                   2191: # Private method: Does the given resource (as a symb string) have
                   2192: # current discussion? Returns 0 if chat/mail data not extracted.
                   2193: sub hasDiscussion {
                   2194:     my $self = shift;
                   2195:     my $symb = shift;
1.221     bowersj2 2196:     $self->generate_email_discuss_status();
                   2197: 
1.133     bowersj2 2198:     if (!defined($self->{DISCUSSION_TIME})) { return 0; }
                   2199: 
                   2200:     #return defined($self->{DISCUSSION_TIME}->{$symb});
1.259     raeburn  2201: 
1.323     albertel 2202:     # backward compatibility (bulletin boards used to be 'wrapped')
                   2203:     my $ressymb = $self->wrap_symb($symb);
1.259     raeburn  2204:     if ( defined ( $self->{LAST_READ}->{$ressymb} ) ) {
                   2205:         return $self->{DISCUSSION_TIME}->{$ressymb} > $self->{LAST_READ}->{$ressymb};
                   2206:     } else {
1.266     raeburn  2207: #        return $self->{DISCUSSION_TIME}->{$ressymb} >  $self->{LAST_CHECK}; # v.1.1 behavior 
                   2208:         return $self->{DISCUSSION_TIME}->{$ressymb} >  0; # in 1.2 will display speech bubble icons for all items with posts until marked as read (even if read in v 1.1).
1.259     raeburn  2209:     }
1.133     bowersj2 2210: }
                   2211: 
1.366     albertel 2212: sub last_post_time {
                   2213:     my $self = shift;
                   2214:     my $symb = shift;
                   2215:     my $ressymb = $self->wrap_symb($symb);
                   2216:     return $self->{DISCUSSION_TIME}->{$ressymb};
                   2217: }
                   2218: 
1.393     raeburn  2219: sub discussion_info {
1.366     albertel 2220:     my $self = shift;
                   2221:     my $symb = shift;
1.393     raeburn  2222:     my $filter = shift;
1.366     albertel 2223: 
                   2224:     $self->get_discussion_data();
1.372     raeburn  2225: 
1.366     albertel 2226:     my $ressymb = $self->wrap_symb($symb);
1.372     raeburn  2227:     # keys used to store bulletinboard postings use 'unwrapped' symb. 
1.397     albertel 2228:     my $discsymb = &escape($self->unwrap_symb($ressymb));
1.372     raeburn  2229:     my $version = $self->{DISCUSSION_DATA}{'version:'.$discsymb};
1.366     albertel 2230:     if (!$version) { return; }
                   2231: 
                   2232:     my $prevread = $self->{LAST_READ}{$ressymb};
                   2233: 
1.393     raeburn  2234:     my $count = 0;
1.366     albertel 2235:     my $hiddenflag = 0;
                   2236:     my $deletedflag = 0;
1.393     raeburn  2237:     my ($hidden,$deleted,%info);
1.366     albertel 2238: 
                   2239:     for (my $id=$version; $id>0; $id--) {
1.372     raeburn  2240: 	my $vkeys=$self->{DISCUSSION_DATA}{$id.':keys:'.$discsymb};
1.366     albertel 2241: 	my @keys=split(/:/,$vkeys);
                   2242: 	if (grep(/^hidden$/ ,@keys)) {
                   2243: 	    if (!$hiddenflag) {
1.372     raeburn  2244: 		$hidden = $self->{DISCUSSION_DATA}{$id.':'.$discsymb.':hidden'};
1.366     albertel 2245: 		$hiddenflag = 1;
                   2246: 	    }
                   2247: 	} elsif (grep(/^deleted$/,@keys)) {
                   2248: 	    if (!$deletedflag) {
1.372     raeburn  2249: 		$deleted = $self->{DISCUSSION_DATA}{$id.':'.$discsymb.':deleted'};
1.366     albertel 2250: 		$deletedflag = 1;
                   2251: 	    }
                   2252: 	} else {
1.393     raeburn  2253: 	    if (($hidden !~/\.$id\./) && ($deleted !~/\.$id\./)) {
                   2254:                 if ($filter eq 'unread') {
                   2255: 		    if ($prevread >= $self->{DISCUSSION_DATA}{$id.':'.$discsymb.':timestamp'}) {
                   2256:                         next;
                   2257:                     }
                   2258:                 }
                   2259: 		$count++;
                   2260: 		$info{$count}{'subject'} =
                   2261: 		    $self->{DISCUSSION_DATA}{$id.':'.$discsymb.':subject'};
                   2262:                 $info{$count}{'id'} = $id;
                   2263:                 $info{$count}{'timestamp'} = $self->{DISCUSSION_DATA}{$id.':'.$discsymb.':timestamp'};
                   2264:             }
1.366     albertel 2265: 	}
                   2266:     }
                   2267:     if (wantarray) {
1.393     raeburn  2268: 	return ($count,%info);
1.366     albertel 2269:     }
1.393     raeburn  2270:     return $count;
1.366     albertel 2271: }
                   2272: 
1.321     raeburn  2273: sub wrap_symb {
1.322     albertel 2274:     my $self = shift;
1.321     raeburn  2275:     my $symb = shift;
1.373     albertel 2276:     if ($symb =~ m-___(adm/[^/]+/[^/]+/)(\d+)(/bulletinboard)$-) {
1.322     albertel 2277:         unless ($symb =~ m|adm/wrapper/adm|) {
                   2278:             $symb = 'bulletin___'.$2.'___adm/wrapper/'.$1.$2.$3;
1.321     raeburn  2279:         }
                   2280:     }
1.322     albertel 2281:     return $symb;
1.321     raeburn  2282: }
                   2283: 
1.372     raeburn  2284: sub unwrap_symb {
                   2285:     my $self = shift;
                   2286:     my $ressymb = shift;
                   2287:     my $discsymb = $ressymb;
1.373     albertel 2288:     if ($ressymb =~ m-^(bulletin___\d+___)adm/wrapper/(adm/[^/]+/[^/]+/\d+/bulletinboard)$-) {
1.372     raeburn  2289:          $discsymb = $1.$2;
                   2290:     }
                   2291:     return $discsymb;
                   2292: }
                   2293: 
1.322     albertel 2294: # Private method: Does the given resource (as a symb string) have
                   2295: # current feedback? Returns the string in the feedback hash, which
                   2296: # will be false if it does not exist.
                   2297: 
1.133     bowersj2 2298: sub getFeedback { 
                   2299:     my $self = shift;
                   2300:     my $symb = shift;
1.395     raeburn  2301:     my $source = shift;
1.133     bowersj2 2302: 
1.221     bowersj2 2303:     $self->generate_email_discuss_status();
                   2304: 
1.133     bowersj2 2305:     if (!defined($self->{FEEDBACK})) { return ""; }
                   2306:     
1.395     raeburn  2307:     my $feedback;
                   2308:     if ($self->{FEEDBACK}->{$symb}) {
                   2309:         $feedback = $self->{FEEDBACK}->{$symb};
                   2310:         if ($self->{FEEDBACK}->{$source}) {
                   2311:             $feedback .= ','.$self->{FEEDBACK}->{$source};
                   2312:         }
                   2313:     } else {
                   2314:         if ($self->{FEEDBACK}->{$source}) {
                   2315:             $feedback = $self->{FEEDBACK}->{$source};
                   2316:         }
                   2317:     }
                   2318:     return $feedback;
1.133     bowersj2 2319: }
                   2320: 
                   2321: # Private method: Get the errors for that resource (by source).
                   2322: sub getErrors { 
                   2323:     my $self = shift;
1.395     raeburn  2324:     my $symb = shift;
1.133     bowersj2 2325:     my $src = shift;
1.221     bowersj2 2326: 
                   2327:     $self->generate_email_discuss_status();
                   2328: 
1.133     bowersj2 2329:     if (!defined($self->{ERROR_MSG})) { return ""; }
1.395     raeburn  2330: 
                   2331:     my $errors;
                   2332:     if ($self->{ERROR_MSG}->{$symb}) {
                   2333:         $errors = $self->{ERROR_MSG}->{$symb};
                   2334:         if ($self->{ERROR_MSG}->{$src}) {
                   2335:             $errors .= ','.$self->{ERROR_MSG}->{$src};
                   2336:         }
                   2337:     } else {
                   2338:         if ($self->{ERROR_MSG}->{$src}) {
                   2339:             $errors = $self->{ERROR_MSG}->{$src};
                   2340:         }
                   2341:     }
                   2342:     return $errors;
1.133     bowersj2 2343: }
                   2344: 
                   2345: =pod
                   2346: 
1.174     albertel 2347: =item * B<getById>(id):
                   2348: 
                   2349: Based on the ID of the resource (1.1, 3.2, etc.), get a resource
                   2350: object for that resource. This method, or other methods that use it
                   2351: (as in the resource object) is the only proper way to obtain a
                   2352: resource object.
1.133     bowersj2 2353: 
1.194     bowersj2 2354: =item * B<getBySymb>(symb):
                   2355: 
                   2356: Based on the symb of the resource, get a resource object for that
                   2357: resource. This is one of the proper ways to get a resource object.
                   2358: 
1.444.2.2  raeburn  2359: =item * B<getByMapPc>(map_pc):
1.194     bowersj2 2360: 
                   2361: Based on the map_pc of the resource, get a resource object for
                   2362: the given map. This is one of the proper ways to get a resource object.
                   2363: 
1.133     bowersj2 2364: =cut
                   2365: 
                   2366: # The strategy here is to cache the resource objects, and only construct them
                   2367: # as we use them. The real point is to prevent reading any more from the tied
1.398     banghart 2368: # hash than we have to, which should hopefully alleviate speed problems.
1.133     bowersj2 2369: 
                   2370: sub getById {
                   2371:     my $self = shift;
                   2372:     my $id = shift;
                   2373: 
                   2374:     if (defined ($self->{RESOURCE_CACHE}->{$id}))
                   2375:     {
                   2376:         return $self->{RESOURCE_CACHE}->{$id};
                   2377:     }
                   2378: 
                   2379:     # resource handles inserting itself into cache.
                   2380:     # Not clear why the quotes are necessary, but as of this
                   2381:     # writing it doesn't work without them.
                   2382:     return "Apache::lonnavmaps::resource"->new($self, $id);
1.132     bowersj2 2383: }
1.133     bowersj2 2384: 
1.172     bowersj2 2385: sub getBySymb {
                   2386:     my $self = shift;
                   2387:     my $symb = shift;
1.277     matthew  2388: 
1.228     albertel 2389:     my ($mapUrl, $id, $filename) = &Apache::lonnet::decode_symb($symb);
1.172     bowersj2 2390:     my $map = $self->getResourceByUrl($mapUrl);
1.277     matthew  2391:     my $returnvalue = undef;
                   2392:     if (ref($map)) {
                   2393:         $returnvalue = $self->getById($map->map_pc() .'.'.$id);
                   2394:     }
                   2395:     return $returnvalue;
1.194     bowersj2 2396: }
                   2397: 
                   2398: sub getByMapPc {
                   2399:     my $self = shift;
                   2400:     my $map_pc = shift;
                   2401:     my $map_id = $self->{NAV_HASH}->{'map_id_' . $map_pc};
                   2402:     $map_id = $self->{NAV_HASH}->{'ids_' . $map_id};
                   2403:     return $self->getById($map_id);
1.172     bowersj2 2404: }
                   2405: 
1.133     bowersj2 2406: =pod
                   2407: 
1.174     albertel 2408: =item * B<firstResource>():
                   2409: 
                   2410: Returns a resource object reference corresponding to the first
                   2411: resource in the navmap.
1.133     bowersj2 2412: 
                   2413: =cut
                   2414: 
                   2415: sub firstResource {
                   2416:     my $self = shift;
                   2417:     my $firstResource = $self->navhash('map_start_' .
1.320     albertel 2418:                      &Apache::lonnet::clutter($env{'request.course.uri'}));
1.133     bowersj2 2419:     return $self->getById($firstResource);
1.132     bowersj2 2420: }
1.133     bowersj2 2421: 
                   2422: =pod
                   2423: 
1.174     albertel 2424: =item * B<finishResource>():
                   2425: 
                   2426: Returns a resource object reference corresponding to the last resource
                   2427: in the navmap.
1.133     bowersj2 2428: 
                   2429: =cut
                   2430: 
                   2431: sub finishResource {
                   2432:     my $self = shift;
                   2433:     my $firstResource = $self->navhash('map_finish_' .
1.320     albertel 2434:                      &Apache::lonnet::clutter($env{'request.course.uri'}));
1.133     bowersj2 2435:     return $self->getById($firstResource);
1.132     bowersj2 2436: }
1.133     bowersj2 2437: 
                   2438: # Parmval reads the parm hash and cascades the lookups. parmval_real does
                   2439: # the actual lookup; parmval caches the results.
                   2440: sub parmval {
                   2441:     my $self = shift;
1.399     albertel 2442:     my ($what,$symb,$recurse)=@_;
1.133     bowersj2 2443:     my $hashkey = $what."|||".$symb;
                   2444: 
                   2445:     if (defined($self->{PARM_CACHE}->{$hashkey})) {
1.411     raeburn  2446:         if (ref($self->{PARM_CACHE}->{$hashkey}) eq 'ARRAY') { 
                   2447:             if (defined($self->{PARM_CACHE}->{$hashkey}->[0])) {
                   2448:                 if (wantarray) {
                   2449:                     return @{$self->{PARM_CACHE}->{$hashkey}};
                   2450:                 } else {
                   2451:                     return $self->{PARM_CACHE}->{$hashkey}->[0];
                   2452:                 }
                   2453:             }
                   2454:         } else {
                   2455:             return $self->{PARM_CACHE}->{$hashkey};
                   2456:         }
1.133     bowersj2 2457:     }
1.399     albertel 2458:     my $result = $self->parmval_real($what, $symb, $recurse);
1.133     bowersj2 2459:     $self->{PARM_CACHE}->{$hashkey} = $result;
1.405     albertel 2460:     if (wantarray) {
1.411     raeburn  2461:         return @{$result};
1.405     albertel 2462:     }
                   2463:     return $result->[0];
1.132     bowersj2 2464: }
                   2465: 
1.133     bowersj2 2466: sub parmval_real {
                   2467:     my $self = shift;
1.219     albertel 2468:     my ($what,$symb,$recurse) = @_;
1.133     bowersj2 2469: 
1.221     bowersj2 2470:     # Make sure the {USER_OPT} and {COURSE_OPT} hashes are populated
                   2471:     $self->generate_course_user_opt();
                   2472: 
1.320     albertel 2473:     my $cid=$env{'request.course.id'};
                   2474:     my $csec=$env{'request.course.sec'};
1.350     raeburn  2475:     my $cgroup='';
                   2476:     my @cgrps=split(/:/,$env{'request.course.groups'});
                   2477:     if (@cgrps > 0) {
                   2478:         @cgrps = sort(@cgrps);
                   2479:         $cgroup = $cgrps[0];
                   2480:     } 
1.320     albertel 2481:     my $uname=$env{'user.name'};
                   2482:     my $udom=$env{'user.domain'};
1.133     bowersj2 2483: 
1.405     albertel 2484:     unless ($symb) { return ['']; }
1.133     bowersj2 2485:     my $result='';
                   2486: 
1.226     www      2487:     my ($mapname,$id,$fn)=&Apache::lonnet::decode_symb($symb);
1.383     albertel 2488:     $mapname = &Apache::lonnet::deversion($mapname);
1.133     bowersj2 2489: # ----------------------------------------------------- Cascading lookup scheme
                   2490:     my $rwhat=$what;
                   2491:     $what=~s/^parameter\_//;
                   2492:     $what=~s/\_/\./;
                   2493: 
                   2494:     my $symbparm=$symb.'.'.$what;
                   2495:     my $mapparm=$mapname.'___(all).'.$what;
1.325     albertel 2496:     my $usercourseprefix=$cid;
1.133     bowersj2 2497: 
1.350     raeburn  2498:     my $grplevel=$usercourseprefix.'.['.$cgroup.'].'.$what;
                   2499:     my $grplevelr=$usercourseprefix.'.['.$cgroup.'].'.$symbparm;
                   2500:     my $grplevelm=$usercourseprefix.'.['.$cgroup.'].'.$mapparm;
                   2501: 
1.133     bowersj2 2502:     my $seclevel= $usercourseprefix.'.['.$csec.'].'.$what;
                   2503:     my $seclevelr=$usercourseprefix.'.['.$csec.'].'.$symbparm;
                   2504:     my $seclevelm=$usercourseprefix.'.['.$csec.'].'.$mapparm;
                   2505: 
                   2506:     my $courselevel= $usercourseprefix.'.'.$what;
                   2507:     my $courselevelr=$usercourseprefix.'.'.$symbparm;
                   2508:     my $courselevelm=$usercourseprefix.'.'.$mapparm;
                   2509: 
                   2510:     my $useropt = $self->{USER_OPT};
                   2511:     my $courseopt = $self->{COURSE_OPT};
                   2512:     my $parmhash = $self->{PARM_HASH};
                   2513: 
                   2514: # ---------------------------------------------------------- first, check user
                   2515:     if ($uname and defined($useropt)) {
1.405     albertel 2516:         if (defined($$useropt{$courselevelr})) { return [$$useropt{$courselevelr},'resource']; }
                   2517:         if (defined($$useropt{$courselevelm})) { return [$$useropt{$courselevelm},'map']; }
                   2518:         if (defined($$useropt{$courselevel})) { return [$$useropt{$courselevel},'course']; }
1.133     bowersj2 2519:     }
                   2520: 
                   2521: # ------------------------------------------------------- second, check course
1.350     raeburn  2522:     if ($cgroup ne '' and defined($courseopt)) {
1.405     albertel 2523:         if (defined($$courseopt{$grplevelr})) { return [$$courseopt{$grplevelr},'resource']; }
                   2524:         if (defined($$courseopt{$grplevelm})) { return [$$courseopt{$grplevelm},'map']; }
                   2525:         if (defined($$courseopt{$grplevel})) { return [$$courseopt{$grplevel},'course']; }
1.350     raeburn  2526:     }
                   2527: 
1.133     bowersj2 2528:     if ($csec and defined($courseopt)) {
1.405     albertel 2529:         if (defined($$courseopt{$seclevelr})) { return [$$courseopt{$seclevelr},'resource']; }
                   2530:         if (defined($$courseopt{$seclevelm})) { return [$$courseopt{$seclevelm},'map']; }
                   2531:         if (defined($$courseopt{$seclevel})) { return [$$courseopt{$seclevel},'course']; }
1.133     bowersj2 2532:     }
                   2533: 
                   2534:     if (defined($courseopt)) {
1.405     albertel 2535:         if (defined($$courseopt{$courselevelr})) { return [$$courseopt{$courselevelr},'resource']; }
1.133     bowersj2 2536:     }
                   2537: 
                   2538: # ----------------------------------------------------- third, check map parms
                   2539: 
                   2540:     my $thisparm=$$parmhash{$symbparm};
1.405     albertel 2541:     if (defined($thisparm)) { return [$thisparm,'map']; }
1.133     bowersj2 2542: 
                   2543: # ----------------------------------------------------- fourth , check default
                   2544: 
1.246     albertel 2545:     my $meta_rwhat=$rwhat;
                   2546:     $meta_rwhat=~s/\./_/g;
                   2547:     my $default=&Apache::lonnet::metadata($fn,$meta_rwhat);
1.405     albertel 2548:     if (defined($default)) { return [$default,'resource']}
1.246     albertel 2549:     $default=&Apache::lonnet::metadata($fn,'parameter_'.$meta_rwhat);
1.405     albertel 2550:     if (defined($default)) { return [$default,'resource']}
1.315     albertel 2551: # --------------------------------------------------- fifth, check more course
                   2552:     if (defined($courseopt)) {
1.405     albertel 2553:         if (defined($$courseopt{$courselevelm})) { return [$$courseopt{$courselevelm},'map']; }
                   2554:         if (defined($$courseopt{$courselevel})) {
                   2555:            my $ret = [$$courseopt{$courselevel},'course'];
                   2556:            return $ret;
                   2557:        }
1.315     albertel 2558:     }
                   2559: # --------------------------------------------------- sixth , cascade up parts
1.133     bowersj2 2560: 
                   2561:     my ($space,@qualifier)=split(/\./,$rwhat);
                   2562:     my $qualifier=join('.',@qualifier);
                   2563:     unless ($space eq '0') {
1.160     albertel 2564: 	my @parts=split(/_/,$space);
                   2565: 	my $id=pop(@parts);
                   2566: 	my $part=join('_',@parts);
                   2567: 	if ($part eq '') { $part='0'; }
1.405     albertel 2568:        my @partgeneral=$self->parmval($part.".$qualifier",$symb,1);
                   2569:        if (defined($partgeneral[0])) { return \@partgeneral; }
1.133     bowersj2 2570:     }
1.405     albertel 2571:     if ($recurse) { return []; }
1.399     albertel 2572:     my $pack_def=&Apache::lonnet::packages_tab_default($fn,'resource.'.$rwhat);
1.405     albertel 2573:     if (defined($pack_def)) { return [$pack_def,'resource']; }
                   2574:     return [''];
1.145     bowersj2 2575: }
                   2576: 
1.174     albertel 2577: =pod
1.145     bowersj2 2578: 
1.352     raeburn  2579: =item * B<getResourceByUrl>(url,multiple):
1.145     bowersj2 2580: 
1.352     raeburn  2581: Retrieves a resource object by URL of the resource, unless the optional
1.398     banghart 2582: multiple parameter is included in which case an array of resource 
1.352     raeburn  2583: objects is returned. If passed a resource object, it will simply return  
                   2584: it, so it is safe to use this method in code like
                   2585: "$res = $navmap->getResourceByUrl($res)"
                   2586: if you're not sure if $res is already an object, or just a URL. If the
                   2587: resource appears multiple times in the course, only the first instance 
                   2588: will be returned (useful for maps), unless the multiple parameter has
                   2589: been included, in which case all instances are returned in an array.
1.174     albertel 2590: 
1.314     albertel 2591: =item * B<retrieveResources>(map, filterFunc, recursive, bailout, showall):
1.174     albertel 2592: 
                   2593: The map is a specification of a map to retreive the resources from,
                   2594: either as a url or as an object. The filterFunc is a reference to a
                   2595: function that takes a resource object as its one argument and returns
                   2596: true if the resource should be included, or false if it should not
                   2597: be. If recursive is true, the map will be recursively examined,
                   2598: otherwise it will not be. If bailout is true, the function will return
1.314     albertel 2599: as soon as it finds a resource, if false it will finish. If showall is
                   2600: true it will not hide maps that contain nothing but one other map. By
                   2601: default, the map is the top-level map of the course, filterFunc is a
                   2602: function that always returns 1, recursive is true, bailout is false,
                   2603: showall is false. The resources will be returned in a list containing
                   2604: the resource objects for the corresponding resources, with B<no
                   2605: structure information> in the list; regardless of branching,
                   2606: recursion, etc., it will be a flat list.
1.174     albertel 2607: 
                   2608: Thus, this is suitable for cases where you don't want the structure,
                   2609: just a list of all resources. It is also suitable for finding out how
                   2610: many resources match a given description; for this use, if all you
                   2611: want to know is if I<any> resources match the description, the bailout
                   2612: parameter will allow you to avoid potentially expensive enumeration of
                   2613: all matching resources.
1.145     bowersj2 2614: 
1.318     albertel 2615: =item * B<hasResource>(map, filterFunc, recursive, showall):
1.145     bowersj2 2616: 
1.398     banghart 2617: Convenience method for
1.146     bowersj2 2618: 
1.318     albertel 2619:  scalar(retrieveResources($map, $filterFunc, $recursive, 1, $showall)) > 0
1.146     bowersj2 2620: 
1.174     albertel 2621: which will tell whether the map has resources matching the description
                   2622: in the filter function.
1.146     bowersj2 2623: 
1.352     raeburn  2624: =item * B<usedVersion>(url):
                   2625: 
                   2626: Retrieves version infomation for a url. Returns the version (a number, or 
                   2627: the string "mostrecent") for resources which have version information in  
                   2628: the big hash.
                   2629:     
1.145     bowersj2 2630: =cut
                   2631: 
1.277     matthew  2632: 
1.145     bowersj2 2633: sub getResourceByUrl {
                   2634:     my $self = shift;
                   2635:     my $resUrl = shift;
1.352     raeburn  2636:     my $multiple = shift;
1.145     bowersj2 2637: 
                   2638:     if (ref($resUrl)) { return $resUrl; }
                   2639: 
                   2640:     $resUrl = &Apache::lonnet::clutter($resUrl);
                   2641:     my $resId = $self->{NAV_HASH}->{'ids_' . $resUrl};
1.352     raeburn  2642:     if (!$resId) { return ''; }
                   2643:     if ($multiple) {
                   2644:         my @resources = ();
                   2645:         my @resIds = split (/,/, $resId);
                   2646:         foreach my $id (@resIds) {
1.353     raeburn  2647:             my $resourceId = $self->getById($id);
                   2648:             if ($resourceId) { 
                   2649:                 push(@resources,$resourceId);
1.352     raeburn  2650:             }
                   2651:         }
                   2652:         return @resources;
                   2653:     } else {
                   2654:         if ($resId =~ /,/) {
                   2655:             $resId = (split (/,/, $resId))[0];
                   2656:         }
                   2657:         return $self->getById($resId);
1.145     bowersj2 2658:     }
                   2659: }
                   2660: 
                   2661: sub retrieveResources {
                   2662:     my $self = shift;
                   2663:     my $map = shift;
                   2664:     my $filterFunc = shift;
                   2665:     if (!defined ($filterFunc)) {
                   2666:         $filterFunc = sub {return 1;};
                   2667:     }
                   2668:     my $recursive = shift;
                   2669:     if (!defined($recursive)) { $recursive = 1; }
                   2670:     my $bailout = shift;
                   2671:     if (!defined($bailout)) { $bailout = 0; }
1.314     albertel 2672:     my $showall = shift;
1.145     bowersj2 2673:     # Create the necessary iterator.
                   2674:     if (!ref($map)) { # assume it's a url of a map.
1.172     bowersj2 2675:         $map = $self->getResourceByUrl($map);
1.145     bowersj2 2676:     }
                   2677: 
1.213     bowersj2 2678:     # If nothing was passed, assume top-level map
                   2679:     if (!$map) {
                   2680: 	$map = $self->getById('0.0');
                   2681:     }
                   2682: 
1.145     bowersj2 2683:     # Check the map's validity.
1.213     bowersj2 2684:     if (!$map->is_map()) {
1.145     bowersj2 2685:         # Oh, to throw an exception.... how I'd love that!
                   2686:         return ();
                   2687:     }
                   2688: 
1.146     bowersj2 2689:     # Get an iterator.
                   2690:     my $it = $self->getIterator($map->map_start(), $map->map_finish(),
1.314     albertel 2691:                                 undef, $recursive, $showall);
1.146     bowersj2 2692: 
                   2693:     my @resources = ();
                   2694: 
1.400     albertel 2695:     if (&$filterFunc($map)) {
                   2696: 	push(@resources, $map);
                   2697:     }
                   2698: 
1.146     bowersj2 2699:     # Run down the iterator and collect the resources.
1.222     bowersj2 2700:     my $curRes;
                   2701: 
                   2702:     while ($curRes = $it->next()) {
1.146     bowersj2 2703:         if (ref($curRes)) {
                   2704:             if (!&$filterFunc($curRes)) {
                   2705:                 next;
                   2706:             }
                   2707: 
1.400     albertel 2708:             push(@resources, $curRes);
1.146     bowersj2 2709: 
                   2710:             if ($bailout) {
                   2711:                 return @resources;
                   2712:             }
                   2713:         }
                   2714: 
                   2715:     }
                   2716: 
                   2717:     return @resources;
                   2718: }
                   2719: 
                   2720: sub hasResource {
                   2721:     my $self = shift;
                   2722:     my $map = shift;
                   2723:     my $filterFunc = shift;
                   2724:     my $recursive = shift;
1.318     albertel 2725:     my $showall = shift;
1.146     bowersj2 2726:     
1.318     albertel 2727:     return scalar($self->retrieveResources($map, $filterFunc, $recursive, 1, $showall)) > 0;
1.133     bowersj2 2728: }
1.51      bowersj2 2729: 
1.352     raeburn  2730: sub usedVersion {
                   2731:     my $self = shift;
                   2732:     my $linkurl = shift;
                   2733:     return $self->navhash("version_$linkurl");
                   2734: }
                   2735: 
1.51      bowersj2 2736: 1;
                   2737: 
                   2738: package Apache::lonnavmaps::iterator;
1.365     albertel 2739: use Scalar::Util qw(weaken);
1.320     albertel 2740: use Apache::lonnet;
                   2741: 
1.51      bowersj2 2742: =pod
                   2743: 
                   2744: =back
                   2745: 
1.174     albertel 2746: =head1 Object: navmap Iterator
1.51      bowersj2 2747: 
1.174     albertel 2748: An I<iterator> encapsulates the logic required to traverse a data
                   2749: structure. navmap uses an iterator to traverse the course map
                   2750: according to the criteria you wish to use.
                   2751: 
                   2752: To obtain an iterator, call the B<getIterator>() function of a
                   2753: B<navmap> object. (Do not instantiate Apache::lonnavmaps::iterator
                   2754: directly.) This will return a reference to the iterator:
1.51      bowersj2 2755: 
                   2756: C<my $resourceIterator = $navmap-E<gt>getIterator();>
                   2757: 
                   2758: To get the next thing from the iterator, call B<next>:
                   2759: 
                   2760: C<my $nextThing = $resourceIterator-E<gt>next()>
                   2761: 
                   2762: getIterator behaves as follows:
                   2763: 
                   2764: =over 4
                   2765: 
1.174     albertel 2766: =item * B<getIterator>(firstResource, finishResource, filterHash, condition, forceTop, returnTopMap):
                   2767: 
                   2768: All parameters are optional. firstResource is a resource reference
                   2769: corresponding to where the iterator should start. It defaults to
                   2770: navmap->firstResource() for the corresponding nav map. finishResource
                   2771: corresponds to where you want the iterator to end, defaulting to
                   2772: navmap->finishResource(). filterHash is a hash used as a set
                   2773: containing strings representing the resource IDs, defaulting to
                   2774: empty. Condition is a 1 or 0 that sets what to do with the filter
1.205     bowersj2 2775: hash: If a 0, then only resources that exist IN the filterHash will be
1.174     albertel 2776: recursed on. If it is a 1, only resources NOT in the filterHash will
                   2777: be recursed on. Defaults to 0. forceTop is a boolean value. If it is
                   2778: false (default), the iterator will only return the first level of map
                   2779: that is not just a single, 'redirecting' map. If true, the iterator
                   2780: will return all information, starting with the top-level map,
                   2781: regardless of content. returnTopMap, if true (default false), will
                   2782: cause the iterator to return the top-level map object (resource 0.0)
                   2783: before anything else.
                   2784: 
                   2785: Thus, by default, only top-level resources will be shown. Change the
                   2786: condition to a 1 without changing the hash, and all resources will be
                   2787: shown. Changing the condition to 1 and including some values in the
                   2788: hash will allow you to selectively suppress parts of the navmap, while
                   2789: leaving it on 0 and adding things to the hash will allow you to
                   2790: selectively add parts of the nav map. See the handler code for
                   2791: examples.
                   2792: 
                   2793: The iterator will return either a reference to a resource object, or a
                   2794: token representing something in the map, such as the beginning of a
                   2795: new branch. The possible tokens are:
                   2796: 
                   2797: =over 4
1.51      bowersj2 2798: 
1.222     bowersj2 2799: =item * B<END_ITERATOR>:
                   2800: 
                   2801: The iterator has returned all that it's going to. Further calls to the
                   2802: iterator will just produce more of these. This is a "false" value, and
                   2803: is the only false value the iterator which will be returned, so it can
                   2804: be used as a loop sentinel.
                   2805: 
1.217     bowersj2 2806: =item * B<BEGIN_MAP>:
1.51      bowersj2 2807: 
1.174     albertel 2808: A new map is being recursed into. This is returned I<after> the map
                   2809: resource itself is returned.
1.51      bowersj2 2810: 
1.217     bowersj2 2811: =item * B<END_MAP>:
1.174     albertel 2812: 
                   2813: The map is now done.
1.51      bowersj2 2814: 
1.217     bowersj2 2815: =item * B<BEGIN_BRANCH>:
1.70      bowersj2 2816: 
1.174     albertel 2817: A branch is now starting. The next resource returned will be the first
                   2818: in that branch.
1.70      bowersj2 2819: 
1.217     bowersj2 2820: =item * B<END_BRANCH>:
1.70      bowersj2 2821: 
1.174     albertel 2822: The branch is now done.
1.51      bowersj2 2823: 
                   2824: =back
                   2825: 
1.174     albertel 2826: The tokens are retreivable via methods on the iterator object, i.e.,
                   2827: $iterator->END_MAP.
1.70      bowersj2 2828: 
1.174     albertel 2829: Maps can contain empty resources. The iterator will automatically skip
                   2830: over such resources, but will still treat the structure
                   2831: correctly. Thus, a complicated map with several branches, but
                   2832: consisting entirely of empty resources except for one beginning or
                   2833: ending resource, will cause a lot of BRANCH_STARTs and BRANCH_ENDs,
                   2834: but only one resource will be returned.
1.116     bowersj2 2835: 
1.242     matthew  2836: =back
                   2837: 
1.222     bowersj2 2838: =head2 Normal Usage
                   2839: 
                   2840: Normal usage of the iterator object is to do the following:
                   2841: 
                   2842:  my $it = $navmap->getIterator([your params here]);
                   2843:  my $curRes;
                   2844:  while ($curRes = $it->next()) {
                   2845:    [your logic here]
                   2846:  }
                   2847: 
                   2848: Note that inside of the loop, it's frequently useful to check if
                   2849: "$curRes" is a reference or not with the reference function; only
                   2850: resource objects will be references, and any non-references will 
                   2851: be the tokens described above.
                   2852: 
                   2853: Also note there is some old code floating around that trys to track
                   2854: the depth of the iterator to see when it's done; do not copy that 
1.398     banghart 2855: code. It is difficult to get right and harder to understand than
1.222     bowersj2 2856: this. They should be migrated to this new style.
1.51      bowersj2 2857: 
                   2858: =cut
                   2859: 
                   2860: # Here are the tokens for the iterator:
                   2861: 
1.222     bowersj2 2862: sub END_ITERATOR { return 0; }
1.51      bowersj2 2863: sub BEGIN_MAP { return 1; }    # begining of a new map
                   2864: sub END_MAP { return 2; }      # end of the map
                   2865: sub BEGIN_BRANCH { return 3; } # beginning of a branch
                   2866: sub END_BRANCH { return 4; }   # end of a branch
1.89      bowersj2 2867: sub FORWARD { return 1; }      # go forward
                   2868: sub BACKWARD { return 2; }
1.51      bowersj2 2869: 
1.96      bowersj2 2870: sub min {
                   2871:     (my $a, my $b) = @_;
                   2872:     if ($a < $b) { return $a; } else { return $b; }
                   2873: }
                   2874: 
1.94      bowersj2 2875: sub new {
                   2876:     # magic invocation to create a class instance
                   2877:     my $proto = shift;
                   2878:     my $class = ref($proto) || $proto;
                   2879:     my $self = {};
                   2880: 
1.300     albertel 2881:     weaken($self->{NAV_MAP} = shift);
1.94      bowersj2 2882:     return undef unless ($self->{NAV_MAP});
                   2883: 
                   2884:     # Handle the parameters
                   2885:     $self->{FIRST_RESOURCE} = shift || $self->{NAV_MAP}->firstResource();
                   2886:     $self->{FINISH_RESOURCE} = shift || $self->{NAV_MAP}->finishResource();
                   2887: 
                   2888:     # If the given resources are just the ID of the resource, get the
                   2889:     # objects
                   2890:     if (!ref($self->{FIRST_RESOURCE})) { $self->{FIRST_RESOURCE} = 
                   2891:              $self->{NAV_MAP}->getById($self->{FIRST_RESOURCE}); }
                   2892:     if (!ref($self->{FINISH_RESOURCE})) { $self->{FINISH_RESOURCE} = 
                   2893:              $self->{NAV_MAP}->getById($self->{FINISH_RESOURCE}); }
                   2894: 
                   2895:     $self->{FILTER} = shift;
                   2896: 
                   2897:     # A hash, used as a set, of resource already seen
                   2898:     $self->{ALREADY_SEEN} = shift;
                   2899:     if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };
                   2900:     $self->{CONDITION} = shift;
                   2901: 
1.116     bowersj2 2902:     # Do we want to automatically follow "redirection" maps?
                   2903:     $self->{FORCE_TOP} = shift;
                   2904: 
1.162     bowersj2 2905:     # Do we want to return the top-level map object (resource 0.0)?
                   2906:     $self->{RETURN_0} = shift;
                   2907:     # have we done that yet?
                   2908:     $self->{HAVE_RETURNED_0} = 0;
                   2909: 
1.94      bowersj2 2910:     # Now, we need to pre-process the map, by walking forward and backward
                   2911:     # over the parts of the map we're going to look at.
1.96      bowersj2 2912: 
1.97      bowersj2 2913:     # The processing steps are exactly the same, except for a few small 
                   2914:     # changes, so I bundle those up in the following list of two elements:
                   2915:     # (direction_to_iterate, VAL_name, next_resource_method_to_call,
                   2916:     # first_resource).
                   2917:     # This prevents writing nearly-identical code twice.
                   2918:     my @iterations = ( [FORWARD(), 'TOP_DOWN_VAL', 'getNext', 
                   2919:                         'FIRST_RESOURCE'],
                   2920:                        [BACKWARD(), 'BOT_UP_VAL', 'getPrevious', 
                   2921:                         'FINISH_RESOURCE'] );
                   2922: 
1.98      bowersj2 2923:     my $maxDepth = 0; # tracks max depth
                   2924: 
1.116     bowersj2 2925:     # If there is only one resource in this map, and it's a map, we
                   2926:     # want to remember that, so the user can ask for the first map
                   2927:     # that isn't just a redirector.
                   2928:     my $resource; my $resourceCount = 0;
                   2929: 
1.209     bowersj2 2930:     # Documentation on this algorithm can be found in the CVS repository at 
                   2931:     # /docs/lonnavdocs; these "**#**" markers correspond to documentation
                   2932:     # in that file.
1.107     bowersj2 2933:     # **1**
                   2934: 
1.97      bowersj2 2935:     foreach my $pass (@iterations) {
                   2936:         my $direction = $pass->[0];
                   2937:         my $valName = $pass->[1];
                   2938:         my $nextResourceMethod = $pass->[2];
                   2939:         my $firstResourceName = $pass->[3];
                   2940: 
                   2941:         my $iterator = Apache::lonnavmaps::DFSiterator->new($self->{NAV_MAP}, 
                   2942:                                                             $self->{FIRST_RESOURCE},
                   2943:                                                             $self->{FINISH_RESOURCE},
                   2944:                                                             {}, undef, 0, $direction);
1.96      bowersj2 2945:     
1.97      bowersj2 2946:         # prime the recursion
                   2947:         $self->{$firstResourceName}->{DATA}->{$valName} = 0;
1.222     bowersj2 2948: 	$iterator->next();
1.97      bowersj2 2949:         my $curRes = $iterator->next();
1.222     bowersj2 2950: 	my $depth = 1;
                   2951:         while ($depth > 0) {
                   2952: 	    if ($curRes == $iterator->BEGIN_MAP()) { $depth++; }
                   2953: 	    if ($curRes == $iterator->END_MAP()) { $depth--; }
                   2954: 
1.97      bowersj2 2955:             if (ref($curRes)) {
1.116     bowersj2 2956:                 # If there's only one resource, this will save it
1.117     bowersj2 2957:                 # we have to filter empty resources from consideration here,
                   2958:                 # or even "empty", redirecting maps have two (start & finish)
                   2959:                 # or three (start, finish, plus redirector)
                   2960:                 if($direction == FORWARD && $curRes->src()) { 
                   2961:                     $resource = $curRes; $resourceCount++; 
                   2962:                 }
1.97      bowersj2 2963:                 my $resultingVal = $curRes->{DATA}->{$valName};
                   2964:                 my $nextResources = $curRes->$nextResourceMethod();
1.116     bowersj2 2965:                 my $nextCount = scalar(@{$nextResources});
1.104     bowersj2 2966: 
1.116     bowersj2 2967:                 if ($nextCount == 1) { # **3**
1.97      bowersj2 2968:                     my $current = $nextResources->[0]->{DATA}->{$valName} || 999999999;
                   2969:                     $nextResources->[0]->{DATA}->{$valName} = min($resultingVal, $current);
                   2970:                 }
                   2971:                 
1.116     bowersj2 2972:                 if ($nextCount > 1) { # **4**
1.97      bowersj2 2973:                     foreach my $res (@{$nextResources}) {
                   2974:                         my $current = $res->{DATA}->{$valName} || 999999999;
                   2975:                         $res->{DATA}->{$valName} = min($current, $resultingVal + 1);
                   2976:                     }
                   2977:                 }
                   2978:             }
1.96      bowersj2 2979:             
1.107     bowersj2 2980:             # Assign the final val (**2**)
1.97      bowersj2 2981:             if (ref($curRes) && $direction == BACKWARD()) {
1.98      bowersj2 2982:                 my $finalDepth = min($curRes->{DATA}->{TOP_DOWN_VAL},
                   2983:                                      $curRes->{DATA}->{BOT_UP_VAL});
                   2984:                 
                   2985:                 $curRes->{DATA}->{DISPLAY_DEPTH} = $finalDepth;
                   2986:                 if ($finalDepth > $maxDepth) {$maxDepth = $finalDepth;}
1.190     bowersj2 2987:             }
1.222     bowersj2 2988: 
                   2989: 	    $curRes = $iterator->next();
1.96      bowersj2 2990:         }
                   2991:     }
1.94      bowersj2 2992: 
1.116     bowersj2 2993:     # Check: Was this only one resource, a map?
1.255     albertel 2994:     if ($resourceCount == 1 && $resource->is_sequence() && !$self->{FORCE_TOP}) { 
1.116     bowersj2 2995:         my $firstResource = $resource->map_start();
                   2996:         my $finishResource = $resource->map_finish();
                   2997:         return 
                   2998:             Apache::lonnavmaps::iterator->new($self->{NAV_MAP}, $firstResource,
                   2999:                                               $finishResource, $self->{FILTER},
                   3000:                                               $self->{ALREADY_SEEN}, 
1.314     albertel 3001:                                               $self->{CONDITION},
                   3002: 					      $self->{FORCE_TOP});
1.116     bowersj2 3003:         
                   3004:     }
                   3005: 
1.98      bowersj2 3006:     # Set up some bookkeeping information.
                   3007:     $self->{CURRENT_DEPTH} = 0;
                   3008:     $self->{MAX_DEPTH} = $maxDepth;
                   3009:     $self->{STACK} = [];
                   3010:     $self->{RECURSIVE_ITERATOR_FLAG} = 0;
1.222     bowersj2 3011:     $self->{FINISHED} = 0; # When true, the iterator has finished
1.98      bowersj2 3012: 
                   3013:     for (my $i = 0; $i <= $self->{MAX_DEPTH}; $i++) {
                   3014:         push @{$self->{STACK}}, [];
                   3015:     }
                   3016: 
1.107     bowersj2 3017:     # Prime the recursion w/ the first resource **5**
1.98      bowersj2 3018:     push @{$self->{STACK}->[0]}, $self->{FIRST_RESOURCE};
                   3019:     $self->{ALREADY_SEEN}->{$self->{FIRST_RESOURCE}->{ID}} = 1;
                   3020: 
                   3021:     bless ($self);
                   3022: 
                   3023:     return $self;
                   3024: }
                   3025: 
                   3026: sub next {
                   3027:     my $self = shift;
1.256     albertel 3028:     my $closeAllPages=shift;
1.222     bowersj2 3029:     if ($self->{FINISHED}) {
                   3030: 	return END_ITERATOR();
                   3031:     }
                   3032: 
1.162     bowersj2 3033:     # If we want to return the top-level map object, and haven't yet,
                   3034:     # do so.
                   3035:     if ($self->{RETURN_0} && !$self->{HAVE_RETURNED_0}) {
                   3036:         $self->{HAVE_RETURNED_0} = 1;
                   3037:         return $self->{NAV_MAP}->getById('0.0');
                   3038:     }
1.401     albertel 3039:     if ($self->{RETURN_0} && !$self->{HAVE_RETURNED_0_BEGIN_MAP}) {
                   3040: 	$self->{HAVE_RETURNED_0_BEGIN_MAP} = 1;
                   3041: 	return $self->BEGIN_MAP();
                   3042:     }
1.98      bowersj2 3043: 
                   3044:     if ($self->{RECURSIVE_ITERATOR_FLAG}) {
                   3045:         # grab the next from the recursive iterator 
1.256     albertel 3046:         my $next = $self->{RECURSIVE_ITERATOR}->next($closeAllPages);
1.98      bowersj2 3047: 
                   3048:         # is it a begin or end map? If so, update the depth
                   3049:         if ($next == BEGIN_MAP() ) { $self->{RECURSIVE_DEPTH}++; }
                   3050:         if ($next == END_MAP() ) { $self->{RECURSIVE_DEPTH}--; }
                   3051: 
                   3052:         # Are we back at depth 0? If so, stop recursing
                   3053:         if ($self->{RECURSIVE_DEPTH} == 0) {
                   3054:             $self->{RECURSIVE_ITERATOR_FLAG} = 0;
                   3055:         }
                   3056: 
                   3057:         return $next;
                   3058:     }
                   3059: 
                   3060:     if (defined($self->{FORCE_NEXT})) {
                   3061:         my $tmp = $self->{FORCE_NEXT};
                   3062:         $self->{FORCE_NEXT} = undef;
                   3063:         return $tmp;
                   3064:     }
                   3065: 
                   3066:     # Have we not yet begun? If not, return BEGIN_MAP and
                   3067:     # remember we've started.
                   3068:     if ( !$self->{STARTED} ) { 
                   3069:         $self->{STARTED} = 1;
                   3070:         return $self->BEGIN_MAP();
                   3071:     }
                   3072: 
                   3073:     # Here's the guts of the iterator.
                   3074:     
                   3075:     # Find the next resource, if any.
                   3076:     my $found = 0;
                   3077:     my $i = $self->{MAX_DEPTH};
                   3078:     my $newDepth;
                   3079:     my $here;
                   3080:     while ( $i >= 0 && !$found ) {
1.107     bowersj2 3081:         if ( scalar(@{$self->{STACK}->[$i]}) > 0 ) { # **6**
                   3082:             $here = pop @{$self->{STACK}->[$i]}; # **7**
1.98      bowersj2 3083:             $found = 1;
                   3084:             $newDepth = $i;
                   3085:         }
                   3086:         $i--;
                   3087:     }
                   3088: 
                   3089:     # If we still didn't find anything, we're done.
                   3090:     if ( !$found ) {
                   3091:         # We need to get back down to the correct branch depth
                   3092:         if ( $self->{CURRENT_DEPTH} > 0 ) {
                   3093:             $self->{CURRENT_DEPTH}--;
                   3094:             return END_BRANCH();
                   3095:         } else {
1.222     bowersj2 3096: 	    $self->{FINISHED} = 1;
1.98      bowersj2 3097:             return END_MAP();
                   3098:         }
                   3099:     }
                   3100: 
1.104     bowersj2 3101:     # If this is not a resource, it must be an END_BRANCH marker we want
                   3102:     # to return directly.
1.107     bowersj2 3103:     if (!ref($here)) { # **8**
1.104     bowersj2 3104:         if ($here == END_BRANCH()) { # paranoia, in case of later extension
                   3105:             $self->{CURRENT_DEPTH}--;
                   3106:             return $here;
                   3107:         }
                   3108:     }
                   3109: 
                   3110:     # Otherwise, it is a resource and it's safe to store in $self->{HERE}
                   3111:     $self->{HERE} = $here;
                   3112: 
1.98      bowersj2 3113:     # Get to the right level
                   3114:     if ( $self->{CURRENT_DEPTH} > $newDepth ) {
                   3115:         push @{$self->{STACK}->[$newDepth]}, $here;
                   3116:         $self->{CURRENT_DEPTH}--;
                   3117:         return END_BRANCH();
                   3118:     }
                   3119:     if ( $self->{CURRENT_DEPTH} < $newDepth) {
                   3120:         push @{$self->{STACK}->[$newDepth]}, $here;
                   3121:         $self->{CURRENT_DEPTH}++;
                   3122:         return BEGIN_BRANCH();
                   3123:     }
                   3124: 
                   3125:     # If we made it here, we have the next resource, and we're at the
                   3126:     # right branch level. So let's examine the resource for where
                   3127:     # we can get to from here.
                   3128: 
                   3129:     # So we need to look at all the resources we can get to from here,
                   3130:     # categorize them if we haven't seen them, remember if we have a new
                   3131:     my $nextUnfiltered = $here->getNext();
1.104     bowersj2 3132:     my $maxDepthAdded = -1;
                   3133:     
1.98      bowersj2 3134:     for (@$nextUnfiltered) {
                   3135:         if (!defined($self->{ALREADY_SEEN}->{$_->{ID}})) {
1.104     bowersj2 3136:             my $depth = $_->{DATA}->{DISPLAY_DEPTH};
                   3137:             push @{$self->{STACK}->[$depth]}, $_;
1.98      bowersj2 3138:             $self->{ALREADY_SEEN}->{$_->{ID}} = 1;
1.104     bowersj2 3139:             if ($maxDepthAdded < $depth) { $maxDepthAdded = $depth; }
1.98      bowersj2 3140:         }
                   3141:     }
1.104     bowersj2 3142: 
                   3143:     # Is this the end of a branch? If so, all of the resources examined above
1.398     banghart 3144:     # led to lower levels than the one we are currently at, so we push a END_BRANCH
1.104     bowersj2 3145:     # marker onto the stack so we don't forget.
                   3146:     # Example: For the usual A(BC)(DE)F case, when the iterator goes down the
                   3147:     # BC branch and gets to C, it will see F as the only next resource, but it's
                   3148:     # one level lower. Thus, this is the end of the branch, since there are no
                   3149:     # more resources added to this level or above.
1.111     bowersj2 3150:     # We don't do this if the examined resource is the finish resource,
                   3151:     # because the condition given above is true, but the "END_MAP" will
                   3152:     # take care of things and we should already be at depth 0.
1.104     bowersj2 3153:     my $isEndOfBranch = $maxDepthAdded < $self->{CURRENT_DEPTH};
1.111     bowersj2 3154:     if ($isEndOfBranch && $here != $self->{FINISH_RESOURCE}) { # **9**
1.104     bowersj2 3155:         push @{$self->{STACK}->[$self->{CURRENT_DEPTH}]}, END_BRANCH();
                   3156:     }
                   3157: 
1.98      bowersj2 3158:     # That ends the main iterator logic. Now, do we want to recurse
                   3159:     # down this map (if this resource is a map)?
1.256     albertel 3160:     if ( ($self->{HERE}->is_sequence() || (!$closeAllPages && $self->{HERE}->is_page())) &&
1.98      bowersj2 3161:         (defined($self->{FILTER}->{$self->{HERE}->map_pc()}) xor $self->{CONDITION})) {
                   3162:         $self->{RECURSIVE_ITERATOR_FLAG} = 1;
                   3163:         my $firstResource = $self->{HERE}->map_start();
                   3164:         my $finishResource = $self->{HERE}->map_finish();
                   3165: 
                   3166:         $self->{RECURSIVE_ITERATOR} = 
                   3167:             Apache::lonnavmaps::iterator->new($self->{NAV_MAP}, $firstResource,
                   3168:                                               $finishResource, $self->{FILTER},
1.314     albertel 3169:                                               $self->{ALREADY_SEEN},
                   3170: 					      $self->{CONDITION},
                   3171: 					      $self->{FORCE_TOP});
1.98      bowersj2 3172:     }
                   3173: 
1.116     bowersj2 3174:     # If this is a blank resource, don't actually return it.
1.117     bowersj2 3175:     # Should you ever find you need it, make sure to add an option to the code
                   3176:     #  that you can use; other things depend on this behavior.
1.138     bowersj2 3177:     my $browsePriv = $self->{HERE}->browsePriv();
                   3178:     if (!$self->{HERE}->src() || 
                   3179:         (!($browsePriv eq 'F') && !($browsePriv eq '2')) ) {
1.256     albertel 3180:         return $self->next($closeAllPages);
1.116     bowersj2 3181:     }
                   3182: 
1.98      bowersj2 3183:     return $self->{HERE};
                   3184: 
                   3185: }
                   3186: 
                   3187: =pod
                   3188: 
1.174     albertel 3189: The other method available on the iterator is B<getStack>, which
                   3190: returns an array populated with the current 'stack' of maps, as
                   3191: references to the resource objects. Example: This is useful when
                   3192: making the navigation map, as we need to check whether we are under a
                   3193: page map to see if we need to link directly to the resource, or to the
                   3194: page. The first elements in the array will correspond to the top of
                   3195: the stack (most inclusive map).
1.98      bowersj2 3196: 
                   3197: =cut
                   3198: 
                   3199: sub getStack {
                   3200:     my $self=shift;
                   3201: 
                   3202:     my @stack;
                   3203: 
                   3204:     $self->populateStack(\@stack);
                   3205: 
                   3206:     return \@stack;
                   3207: }
                   3208: 
                   3209: # Private method: Calls the iterators recursively to populate the stack.
                   3210: sub populateStack {
                   3211:     my $self=shift;
                   3212:     my $stack = shift;
                   3213: 
                   3214:     push @$stack, $self->{HERE} if ($self->{HERE});
                   3215: 
                   3216:     if ($self->{RECURSIVE_ITERATOR_FLAG}) {
                   3217:         $self->{RECURSIVE_ITERATOR}->populateStack($stack);
                   3218:     }
1.94      bowersj2 3219: }
                   3220: 
                   3221: 1;
                   3222: 
                   3223: package Apache::lonnavmaps::DFSiterator;
1.365     albertel 3224: use Scalar::Util qw(weaken);
1.320     albertel 3225: use Apache::lonnet;
                   3226: 
1.100     bowersj2 3227: # Not documented in the perldoc: This is a simple iterator that just walks
                   3228: #  through the nav map and presents the resources in a depth-first search
                   3229: #  fashion, ignorant of conditionals, randomized resources, etc. It presents
                   3230: #  BEGIN_MAP and END_MAP, but does not understand branches at all. It is
                   3231: #  useful for pre-processing of some kind, and is in fact used by the main
                   3232: #  iterator that way, but that's about it.
                   3233: # One could imagine merging this into the init routine of the main iterator,
1.251     www      3234: #  but this might as well be left separate, since it is possible some other
1.100     bowersj2 3235: #  use might be found for it. - Jeremy
1.94      bowersj2 3236: 
1.117     bowersj2 3237: # Unlike the main iterator, this DOES return all resources, even blank ones.
                   3238: #  The main iterator needs them to correctly preprocess the map.
                   3239: 
1.94      bowersj2 3240: sub BEGIN_MAP { return 1; }    # begining of a new map
                   3241: sub END_MAP { return 2; }      # end of the map
                   3242: sub FORWARD { return 1; }      # go forward
                   3243: sub BACKWARD { return 2; }
                   3244: 
1.100     bowersj2 3245: # Params: Nav map ref, first resource id/ref, finish resource id/ref,
                   3246: #         filter hash ref (or undef), already seen hash or undef, condition
                   3247: #         (as in main iterator), direction FORWARD or BACKWARD (undef->forward).
1.51      bowersj2 3248: sub new {
                   3249:     # magic invocation to create a class instance
                   3250:     my $proto = shift;
                   3251:     my $class = ref($proto) || $proto;
                   3252:     my $self = {};
                   3253: 
1.300     albertel 3254:     weaken($self->{NAV_MAP} = shift);
1.51      bowersj2 3255:     return undef unless ($self->{NAV_MAP});
                   3256: 
                   3257:     $self->{FIRST_RESOURCE} = shift || $self->{NAV_MAP}->firstResource();
                   3258:     $self->{FINISH_RESOURCE} = shift || $self->{NAV_MAP}->finishResource();
                   3259: 
                   3260:     # If the given resources are just the ID of the resource, get the
                   3261:     # objects
                   3262:     if (!ref($self->{FIRST_RESOURCE})) { $self->{FIRST_RESOURCE} = 
                   3263:              $self->{NAV_MAP}->getById($self->{FIRST_RESOURCE}); }
                   3264:     if (!ref($self->{FINISH_RESOURCE})) { $self->{FINISH_RESOURCE} = 
                   3265:              $self->{NAV_MAP}->getById($self->{FINISH_RESOURCE}); }
                   3266: 
                   3267:     $self->{FILTER} = shift;
                   3268: 
                   3269:     # A hash, used as a set, of resource already seen
                   3270:     $self->{ALREADY_SEEN} = shift;
1.140     bowersj2 3271:      if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };
1.63      bowersj2 3272:     $self->{CONDITION} = shift;
1.89      bowersj2 3273:     $self->{DIRECTION} = shift || FORWARD();
1.51      bowersj2 3274: 
1.100     bowersj2 3275:     # Flag: Have we started yet?
1.51      bowersj2 3276:     $self->{STARTED} = 0;
                   3277: 
                   3278:     # Should we continue calling the recursive iterator, if any?
                   3279:     $self->{RECURSIVE_ITERATOR_FLAG} = 0;
                   3280:     # The recursive iterator, if any
                   3281:     $self->{RECURSIVE_ITERATOR} = undef;
                   3282:     # Are we recursing on a map, or a branch?
                   3283:     $self->{RECURSIVE_MAP} = 1; # we'll manually unset this when recursing on branches
                   3284:     # And the count of how deep it is, so that this iterator can keep track of
                   3285:     # when to pick back up again.
                   3286:     $self->{RECURSIVE_DEPTH} = 0;
                   3287: 
                   3288:     # For keeping track of our branches, we maintain our own stack
1.100     bowersj2 3289:     $self->{STACK} = [];
1.51      bowersj2 3290: 
                   3291:     # Start with the first resource
1.89      bowersj2 3292:     if ($self->{DIRECTION} == FORWARD) {
1.100     bowersj2 3293:         push @{$self->{STACK}}, $self->{FIRST_RESOURCE};
1.89      bowersj2 3294:     } else {
1.100     bowersj2 3295:         push @{$self->{STACK}}, $self->{FINISH_RESOURCE};
1.89      bowersj2 3296:     }
1.51      bowersj2 3297: 
                   3298:     bless($self);
                   3299:     return $self;
                   3300: }
                   3301: 
                   3302: sub next {
                   3303:     my $self = shift;
                   3304:     
                   3305:     # Are we using a recursive iterator? If so, pull from that and
                   3306:     # watch the depth; we want to resume our level at the correct time.
1.98      bowersj2 3307:     if ($self->{RECURSIVE_ITERATOR_FLAG}) {
1.51      bowersj2 3308:         # grab the next from the recursive iterator
                   3309:         my $next = $self->{RECURSIVE_ITERATOR}->next();
                   3310:         
                   3311:         # is it a begin or end map? Update depth if so
                   3312:         if ($next == BEGIN_MAP() ) { $self->{RECURSIVE_DEPTH}++; }
                   3313:         if ($next == END_MAP() ) { $self->{RECURSIVE_DEPTH}--; }
                   3314: 
                   3315:         # Are we back at depth 0? If so, stop recursing.
                   3316:         if ($self->{RECURSIVE_DEPTH} == 0) {
                   3317:             $self->{RECURSIVE_ITERATOR_FLAG} = 0;
                   3318:         }
                   3319:         
                   3320:         return $next;
                   3321:     }
                   3322: 
                   3323:     # Is there a current resource to grab? If not, then return
1.100     bowersj2 3324:     # END_MAP, which will end the iterator.
                   3325:     if (scalar(@{$self->{STACK}}) == 0) {
                   3326:         return $self->END_MAP();
1.51      bowersj2 3327:     }
                   3328: 
                   3329:     # Have we not yet begun? If not, return BEGIN_MAP and 
                   3330:     # remember that we've started.
                   3331:     if ( !$self->{STARTED} ) {
                   3332:         $self->{STARTED} = 1;
                   3333:         return $self->BEGIN_MAP;
                   3334:     }
                   3335: 
                   3336:     # Get the next resource in the branch
1.100     bowersj2 3337:     $self->{HERE} = pop @{$self->{STACK}};
1.52      bowersj2 3338: 
1.100     bowersj2 3339:     # remember that we've seen this, so we don't return it again later
1.51      bowersj2 3340:     $self->{ALREADY_SEEN}->{$self->{HERE}->{ID}} = 1;
                   3341:     
                   3342:     # Get the next possible resources
1.90      bowersj2 3343:     my $nextUnfiltered;
1.89      bowersj2 3344:     if ($self->{DIRECTION} == FORWARD()) {
1.90      bowersj2 3345:         $nextUnfiltered = $self->{HERE}->getNext();
1.89      bowersj2 3346:     } else {
1.90      bowersj2 3347:         $nextUnfiltered = $self->{HERE}->getPrevious();
1.89      bowersj2 3348:     }
1.51      bowersj2 3349:     my $next = [];
                   3350: 
                   3351:     # filter the next possibilities to remove things we've 
1.100     bowersj2 3352:     # already seen.
1.394     raeburn  3353:     foreach my $item (@$nextUnfiltered) {
                   3354:         if (!defined($self->{ALREADY_SEEN}->{$item->{ID}})) {
                   3355:             push @$next, $item;
1.52      bowersj2 3356:         }
1.51      bowersj2 3357:     }
                   3358: 
                   3359:     while (@$next) {
1.100     bowersj2 3360:         # copy the next possibilities over to the stack
                   3361:         push @{$self->{STACK}}, shift @$next;
1.51      bowersj2 3362:     }
                   3363: 
                   3364:     # If this is a map and we want to recurse down it... (not filtered out)
1.70      bowersj2 3365:     if ($self->{HERE}->is_map() && 
1.63      bowersj2 3366:          (defined($self->{FILTER}->{$self->{HERE}->map_pc()}) xor $self->{CONDITION})) { 
1.51      bowersj2 3367:         $self->{RECURSIVE_ITERATOR_FLAG} = 1;
                   3368:         my $firstResource = $self->{HERE}->map_start();
                   3369:         my $finishResource = $self->{HERE}->map_finish();
                   3370: 
                   3371:         $self->{RECURSIVE_ITERATOR} =
1.94      bowersj2 3372:           Apache::lonnavmaps::DFSiterator->new ($self->{NAV_MAP}, $firstResource, 
1.63      bowersj2 3373:                      $finishResource, $self->{FILTER}, $self->{ALREADY_SEEN},
1.91      bowersj2 3374:                                              $self->{CONDITION}, $self->{DIRECTION});
1.51      bowersj2 3375:     }
                   3376: 
                   3377:     return $self->{HERE};
1.190     bowersj2 3378: }
                   3379: 
                   3380: # Identical to the full iterator methods of the same name. Hate to copy/paste
                   3381: # but I also hate to "inherit" either iterator from the other.
                   3382: 
                   3383: sub getStack {
                   3384:     my $self=shift;
                   3385: 
                   3386:     my @stack;
                   3387: 
                   3388:     $self->populateStack(\@stack);
                   3389: 
                   3390:     return \@stack;
                   3391: }
                   3392: 
                   3393: # Private method: Calls the iterators recursively to populate the stack.
                   3394: sub populateStack {
                   3395:     my $self=shift;
                   3396:     my $stack = shift;
                   3397: 
                   3398:     push @$stack, $self->{HERE} if ($self->{HERE});
                   3399: 
                   3400:     if ($self->{RECURSIVE_ITERATOR_FLAG}) {
                   3401:         $self->{RECURSIVE_ITERATOR}->populateStack($stack);
                   3402:     }
1.51      bowersj2 3403: }
                   3404: 
1.1       www      3405: 1;
1.2       www      3406: 
1.51      bowersj2 3407: package Apache::lonnavmaps::resource;
1.365     albertel 3408: use Scalar::Util qw(weaken);
1.51      bowersj2 3409: use Apache::lonnet;
                   3410: 
                   3411: =pod
                   3412: 
1.217     bowersj2 3413: =head1 Object: resource 
1.51      bowersj2 3414: 
1.217     bowersj2 3415: X<resource, navmap object>
1.174     albertel 3416: A resource object encapsulates a resource in a resource map, allowing
                   3417: easy manipulation of the resource, querying the properties of the
                   3418: resource (including user properties), and represents a reference that
                   3419: can be used as the canonical representation of the resource by
                   3420: lonnavmap clients like renderers.
                   3421: 
                   3422: A resource only makes sense in the context of a navmap, as some of the
                   3423: data is stored in the navmap object.
                   3424: 
                   3425: You will probably never need to instantiate this object directly. Use
                   3426: Apache::lonnavmaps::navmap, and use the "start" method to obtain the
                   3427: starting resource.
1.51      bowersj2 3428: 
1.188     bowersj2 3429: Resource objects respect the parameter_hiddenparts, which suppresses 
                   3430: various parts according to the wishes of the map author. As of this
                   3431: writing, there is no way to override this parameter, and suppressed
                   3432: parts will never be returned, nor will their response types or ids be
                   3433: stored.
                   3434: 
1.217     bowersj2 3435: =head2 Overview
1.51      bowersj2 3436: 
1.217     bowersj2 3437: A B<Resource> is the most granular type of object in LON-CAPA that can
                   3438: be included in a course. It can either be a particular resource, like
                   3439: an HTML page, external resource, problem, etc., or it can be a
                   3440: container sequence, such as a "page" or a "map".
                   3441: 
                   3442: To see a sequence from the user's point of view, please see the
                   3443: B<Creating a Course: Maps and Sequences> chapter of the Author's
                   3444: Manual.
                   3445: 
                   3446: A Resource Object, once obtained from a navmap object via a B<getBy*>
                   3447: method of the navmap, or from an iterator, allows you to query
                   3448: information about that resource.
                   3449: 
                   3450: Generally, you do not ever want to create a resource object yourself,
                   3451: so creation has been left undocumented. Always retrieve resources
                   3452: from navmap objects.
                   3453: 
                   3454: =head3 Identifying Resources
                   3455: 
                   3456: X<big hash>Every resource is identified by a Resource ID in the big hash that is
                   3457: unique to that resource for a given course. X<resource ID, in big hash>
                   3458: The Resource ID has the form #.#, where the first number is the same
                   3459: for every resource in a map, and the second is unique. For instance,
                   3460: for a course laid out like this:
                   3461: 
                   3462:  * Problem 1
                   3463:  * Map
                   3464:    * Resource 2
                   3465:    * Resource 3
                   3466: 
                   3467: C<Problem 1> and C<Map> will share a first number, and C<Resource 2>
                   3468: C<Resource 3> will share a first number. The second number may end up
                   3469: re-used between the two groups.
                   3470: 
                   3471: The resource ID is only used in the big hash, but can be used in the
                   3472: context of a course to identify a resource easily. (For instance, the
                   3473: printing system uses it to record which resources from a sequence you 
                   3474: wish to print.)
                   3475: 
                   3476: X<symb> X<resource, symb>
                   3477: All resources also have B<symb>s, which uniquely identify a resource
                   3478: in a course. Many internal LON-CAPA functions expect a symb. A symb
                   3479: carries along with it the URL of the resource, and the map it appears
1.398     banghart 3480: in. Symbs are much larger than resource IDs.
1.51      bowersj2 3481: 
                   3482: =cut
                   3483: 
                   3484: sub new {
                   3485:     # magic invocation to create a class instance
                   3486:     my $proto = shift;
                   3487:     my $class = ref($proto) || $proto;
                   3488:     my $self = {};
                   3489: 
1.300     albertel 3490:     weaken($self->{NAV_MAP} = shift);
1.51      bowersj2 3491:     $self->{ID} = shift;
                   3492: 
                   3493:     # Store this new resource in the parent nav map's cache.
                   3494:     $self->{NAV_MAP}->{RESOURCE_CACHE}->{$self->{ID}} = $self;
1.66      bowersj2 3495:     $self->{RESOURCE_ERROR} = 0;
1.51      bowersj2 3496: 
                   3497:     # A hash that can be used by two-pass algorithms to store data
                   3498:     # about this resource in. Not used by the resource object
                   3499:     # directly.
                   3500:     $self->{DATA} = {};
                   3501:    
                   3502:     bless($self);
                   3503:     
                   3504:     return $self;
                   3505: }
                   3506: 
1.70      bowersj2 3507: # private function: simplify the NAV_HASH lookups we keep doing
                   3508: # pass the name, and to automatically append my ID, pass a true val on the
                   3509: # second param
                   3510: sub navHash {
                   3511:     my $self = shift;
                   3512:     my $param = shift;
                   3513:     my $id = shift;
1.441     raeburn  3514:     my $arg = $param . ($id?$self->{ID}:"");
                   3515:     if (defined($arg)) {
                   3516:         return $self->{NAV_MAP}->navhash($arg);
                   3517:     }
                   3518:     return;
1.70      bowersj2 3519: }
                   3520: 
1.51      bowersj2 3521: =pod
                   3522: 
1.217     bowersj2 3523: =head2 Methods
1.70      bowersj2 3524: 
1.217     bowersj2 3525: Once you have a resource object, here's what you can do with it:
                   3526: 
                   3527: =head3 Attribute Retrieval
                   3528: 
                   3529: Every resource has certain attributes that can be retrieved and used:
1.70      bowersj2 3530: 
                   3531: =over 4
                   3532: 
1.217     bowersj2 3533: =item * B<ID>: Every resource has an ID that is unique for that
                   3534:     resource in the course it is in. The ID is actually in the hash
                   3535:     representing the resource, so for a resource object $res, obtain
                   3536:     it via C<$res->{ID}).
                   3537: 
1.174     albertel 3538: =item * B<compTitle>:
                   3539: 
                   3540: Returns a "composite title", that is equal to $res->title() if the
                   3541: resource has a title, and is otherwise the last part of the URL (e.g.,
                   3542: "problem.problem").
                   3543: 
                   3544: =item * B<ext>:
                   3545: 
                   3546: Returns true if the resource is external.
                   3547: 
                   3548: =item * B<kind>:
                   3549: 
                   3550: Returns the kind of the resource from the compiled nav map.
                   3551: 
                   3552: =item * B<randomout>:
1.106     bowersj2 3553: 
1.174     albertel 3554: Returns true if this resource was chosen to NOT be shown to the user
                   3555: by the random map selection feature. In other words, this is usually
                   3556: false.
1.70      bowersj2 3557: 
1.174     albertel 3558: =item * B<randompick>:
1.70      bowersj2 3559: 
1.400     albertel 3560: Returns the number of randomly picked items for a map if the randompick
                   3561: feature is being used on the map. 
                   3562: 
                   3563: =item * B<randomorder>:
                   3564: 
                   3565: Returns true for a map if the randomorder feature is being used on the
                   3566: map.
1.70      bowersj2 3567: 
1.174     albertel 3568: =item * B<src>:
1.51      bowersj2 3569: 
1.174     albertel 3570: Returns the source for the resource.
1.70      bowersj2 3571: 
1.174     albertel 3572: =item * B<symb>:
1.70      bowersj2 3573: 
1.174     albertel 3574: Returns the symb for the resource.
1.70      bowersj2 3575: 
1.174     albertel 3576: =item * B<title>:
1.70      bowersj2 3577: 
1.174     albertel 3578: Returns the title of the resource.
                   3579: 
1.51      bowersj2 3580: =back
                   3581: 
                   3582: =cut
                   3583: 
                   3584: # These info functions can be used directly, as they don't return
                   3585: # resource information.
1.85      bowersj2 3586: sub comesfrom { my $self=shift; return $self->navHash("comesfrom_", 1); }
1.303     albertel 3587: sub encrypted { my $self=shift; return $self->navHash("encrypted_", 1); }
1.70      bowersj2 3588: sub ext { my $self=shift; return $self->navHash("ext_", 1) eq 'true:'; }
1.85      bowersj2 3589: sub from { my $self=shift; return $self->navHash("from_", 1); }
1.217     bowersj2 3590: # considered private and undocumented
1.51      bowersj2 3591: sub goesto { my $self=shift; return $self->navHash("goesto_", 1); }
                   3592: sub kind { my $self=shift; return $self->navHash("kind_", 1); }
1.68      bowersj2 3593: sub randomout { my $self=shift; return $self->navHash("randomout_", 1); }
                   3594: sub randompick { 
                   3595:     my $self = shift;
1.410     raeburn  3596:     my $randompick = $self->parmval('randompick');
                   3597:     return $randompick;
1.68      bowersj2 3598: }
1.400     albertel 3599: sub randomorder { 
                   3600:     my $self = shift;
1.410     raeburn  3601:     my $randomorder = $self->parmval('randomorder');
                   3602:     return ($randomorder =~ /^yes$/i);
1.400     albertel 3603: }
1.303     albertel 3604: sub link {
                   3605:     my $self=shift;
                   3606:     if ($self->encrypted()) { return &Apache::lonenc::encrypted($self->src); }
                   3607:     return $self->src;
                   3608: }
1.51      bowersj2 3609: sub src { 
                   3610:     my $self=shift;
                   3611:     return $self->navHash("src_", 1);
                   3612: }
1.303     albertel 3613: sub shown_symb {
                   3614:     my $self=shift;
                   3615:     if ($self->encrypted()) {return &Apache::lonenc::encrypted($self->symb());}
                   3616:     return $self->symb();
                   3617: }
1.328     www      3618: sub id {
                   3619:     my $self=shift;
                   3620:     return $self->{ID};
                   3621: }
                   3622: sub enclosing_map_src {
                   3623:     my $self=shift;
                   3624:     (my $first, my $second) = $self->{ID} =~ /(\d+).(\d+)/;
                   3625:     return $self->navHash('map_id_'.$first);
                   3626: }
1.51      bowersj2 3627: sub symb {
                   3628:     my $self=shift;
                   3629:     (my $first, my $second) = $self->{ID} =~ /(\d+).(\d+)/;
                   3630:     my $symbSrc = &Apache::lonnet::declutter($self->src());
1.223     albertel 3631:     my $symb = &Apache::lonnet::declutter($self->navHash('map_id_'.$first)) 
1.51      bowersj2 3632:         . '___' . $second . '___' . $symbSrc;
1.223     albertel 3633:     return &Apache::lonnet::symbclean($symb);
1.51      bowersj2 3634: }
1.321     raeburn  3635: sub wrap_symb {
                   3636:     my $self = shift;
                   3637:     return $self->{NAV_MAP}->wrap_symb($self->symb());
                   3638: }
1.213     bowersj2 3639: sub title { 
                   3640:     my $self=shift; 
                   3641:     if ($self->{ID} eq '0.0') {
                   3642: 	# If this is the top-level map, return the title of the course
                   3643: 	# since this map can not be titled otherwise.
1.320     albertel 3644: 	return $env{'course.'.$env{'request.course.id'}.'.description'};
1.213     bowersj2 3645:     }
                   3646:     return $self->navHash("title_", 1); }
1.217     bowersj2 3647: # considered private and undocumented
1.70      bowersj2 3648: sub to { my $self=shift; return $self->navHash("to_", 1); }
1.301     albertel 3649: sub condition {
                   3650:     my $self=shift;
                   3651:     my $undercond=$self->navHash("undercond_", 1);
                   3652:     if (!defined($undercond)) { return 1; };
                   3653:     my $condid=$self->navHash("condid_$undercond");
                   3654:     if (!defined($condid)) { return 1; };
                   3655:     my $condition=&Apache::lonnet::directcondval($condid);
                   3656:     return $condition;
                   3657: }
1.342     albertel 3658: sub condval {
                   3659:     my $self=shift;
1.359     albertel 3660:     my ($pathname,$filename) = 
                   3661: 	&Apache::lonnet::split_uri_for_cond($self->src());
1.342     albertel 3662: 
                   3663:     my $match=($env{'acc.res.'.$env{'request.course.id'}.'.'.$pathname}=~
                   3664: 	       /\&\Q$filename\E\:([\d\|]+)\&/);
                   3665:     if ($match) {
                   3666: 	return &Apache::lonnet::condval($1);
                   3667:     }
                   3668:     return 0;
                   3669: }
1.106     bowersj2 3670: sub compTitle {
                   3671:     my $self = shift;
                   3672:     my $title = $self->title();
1.176     www      3673:     $title=~s/\&colon\;/\:/gs;
1.106     bowersj2 3674:     if (!$title) {
                   3675:         $title = $self->src();
                   3676:         $title = substr($title, rindex($title, '/') + 1);
                   3677:     }
                   3678:     return $title;
                   3679: }
1.399     albertel 3680: 
1.70      bowersj2 3681: =pod
                   3682: 
                   3683: B<Predicate Testing the Resource>
                   3684: 
                   3685: These methods are shortcuts to deciding if a given resource has a given property.
                   3686: 
                   3687: =over 4
                   3688: 
1.174     albertel 3689: =item * B<is_map>:
                   3690: 
                   3691: Returns true if the resource is a map type.
                   3692: 
                   3693: =item * B<is_problem>:
1.70      bowersj2 3694: 
1.174     albertel 3695: Returns true if the resource is a problem type, false
                   3696: otherwise. (Looks at the extension on the src field; might need more
                   3697: to work correctly.)
1.70      bowersj2 3698: 
1.174     albertel 3699: =item * B<is_page>:
1.70      bowersj2 3700: 
1.174     albertel 3701: Returns true if the resource is a page.
                   3702: 
                   3703: =item * B<is_sequence>:
                   3704: 
                   3705: Returns true if the resource is a sequence.
1.70      bowersj2 3706: 
                   3707: =back
                   3708: 
                   3709: =cut
                   3710: 
1.256     albertel 3711: sub hasResource {
                   3712:    my $self = shift;
                   3713:    return $self->{NAV_MAP}->hasResource(@_);
                   3714: }
                   3715: 
                   3716: sub retrieveResources {
                   3717:    my $self = shift;
                   3718:    return $self->{NAV_MAP}->retrieveResources(@_);
                   3719: }
1.70      bowersj2 3720: 
1.369     albertel 3721: sub is_exam {
                   3722:     my ($self,$part) = @_;
1.410     raeburn  3723:     my $type = $self->parmval('type',$part);
                   3724:     if ($type eq 'exam') {
1.369     albertel 3725:         return 1;
                   3726:     }
                   3727:     if ($self->src() =~ /\.(exam)$/) {
                   3728:         return 1;
                   3729:     }
                   3730:     return 0;
                   3731: }
1.70      bowersj2 3732: sub is_html {
1.51      bowersj2 3733:     my $self=shift;
                   3734:     my $src = $self->src();
1.70      bowersj2 3735:     return ($src =~ /html$/);
1.51      bowersj2 3736: }
1.70      bowersj2 3737: sub is_map { my $self=shift; return defined($self->navHash("is_map_", 1)); }
                   3738: sub is_page {
1.51      bowersj2 3739:     my $self=shift;
                   3740:     my $src = $self->src();
1.205     bowersj2 3741:     return $self->navHash("is_map_", 1) && 
                   3742: 	$self->navHash("map_type_" . $self->map_pc()) eq 'page';
1.51      bowersj2 3743: }
1.361     albertel 3744: sub is_practice {
                   3745:     my $self=shift;
                   3746:     my ($part) = @_;
1.410     raeburn  3747:     my $type = $self->parmval('type',$part);
                   3748:     if ($type eq 'practice') {
1.361     albertel 3749:         return 1;
                   3750:     }
                   3751:     return 0;
                   3752: }
1.70      bowersj2 3753: sub is_problem {
1.51      bowersj2 3754:     my $self=shift;
                   3755:     my $src = $self->src();
1.361     albertel 3756:     if ($src =~ /\.(problem|exam|quiz|assess|survey|form|library|task)$/) {
                   3757: 	return !($self->is_practice());
                   3758:     }
                   3759:     return 0;
1.256     albertel 3760: }
1.443     foxr     3761: #
                   3762: #  The has below is the set of status that are considered 'incomplete'
                   3763: #
                   3764: my %incomplete_hash = 
                   3765: (
                   3766:  TRIES_LEFT()     => 1,
                   3767:  OPEN()           => 1,
                   3768:  ATTEMPTED()      => 1
                   3769: 
                   3770:  );
                   3771: #
                   3772: #  Return tru if a problem is incomplete... for now incomplete means that
                   3773: #  any part of the problem is incomplete. 
                   3774: #  Note that if the resources is not a problem, 0 is returned.
                   3775: #
                   3776: sub is_incomplete {
                   3777:     my $self = shift;
                   3778:     if ($self->is_problem()) {
                   3779: 	&Apache::lonnet::logthis('is problem');
                   3780: 	foreach my $part (@{$self->parts()}) {
                   3781: 	    &Apache::lonnet::logthis("$part status ".$self->status($part));
                   3782: 	    if (exists($incomplete_hash{$self->status($part)})) {
                   3783: 		return 1;
                   3784: 	    }
                   3785: 	}
                   3786:     }
                   3787:     return 0;
                   3788:        
                   3789: }
1.413     www      3790: sub is_raw_problem {
                   3791:     my $self=shift;
                   3792:     my $src = $self->src();
                   3793:     if ($src =~ /\.(problem|exam|quiz|assess|survey|form|library|task)$/) {
                   3794:         return 1;
                   3795:     }
                   3796:     return 0;
                   3797: }
                   3798: 
1.256     albertel 3799: sub contains_problem {
                   3800:     my $self=shift;
                   3801:     if ($self->is_page()) {
                   3802: 	my $hasProblem=$self->hasResource($self,sub { $_[0]->is_problem() },1);
                   3803: 	return $hasProblem;
                   3804:     }
                   3805:     return 0;
1.51      bowersj2 3806: }
1.401     albertel 3807: sub map_contains_problem {
                   3808:     my $self=shift;
                   3809:     if ($self->is_map()) {
                   3810: 	my $has_problem=
                   3811: 	    $self->hasResource($self,sub { $_[0]->is_problem() },1);
                   3812: 	return $has_problem;
                   3813:     }
                   3814:     return 0;
                   3815: }
1.70      bowersj2 3816: sub is_sequence {
1.51      bowersj2 3817:     my $self=shift;
1.205     bowersj2 3818:     return $self->navHash("is_map_", 1) && 
1.426     droeschl 3819:     $self->navHash("map_type_" . $self->map_pc()) eq 'sequence';
1.51      bowersj2 3820: }
1.261     matthew  3821: sub is_survey {
                   3822:     my $self = shift();
                   3823:     my $part = shift();
1.410     raeburn  3824:     my $type = $self->parmval('type',$part);
1.444     raeburn  3825:     if (($type eq 'survey') || ($type eq 'surveycred')) {
1.261     matthew  3826:         return 1;
                   3827:     }
1.263     albertel 3828:     if ($self->src() =~ /\.(survey)$/) {
1.261     matthew  3829:         return 1;
                   3830:     }
                   3831:     return 0;
                   3832: }
1.444     raeburn  3833: sub is_anonsurvey {
                   3834:     my $self = shift();
                   3835:     my $part = shift();
                   3836:     my $type = $self->parmval('type',$part);
                   3837:     if (($type eq 'anonsurvey') || ($type eq 'anonsurveycred')) {
                   3838:         return 1;
                   3839:     }
                   3840:     return 0;
                   3841: }
1.360     albertel 3842: sub is_task {
                   3843:     my $self=shift;
                   3844:     my $src = $self->src();
                   3845:     return ($src =~ /\.(task)$/)
                   3846: }
1.51      bowersj2 3847: 
1.266     raeburn  3848: sub is_empty_sequence {
                   3849:     my $self=shift;
                   3850:     my $src = $self->src();
                   3851:     return !$self->is_page() && $self->navHash("is_map_", 1) && !$self->navHash("map_type_" . $self->map_pc());
                   3852: }
                   3853: 
1.101     bowersj2 3854: # Private method: Shells out to the parmval in the nav map, handler parts.
1.51      bowersj2 3855: sub parmval {
                   3856:     my $self = shift;
                   3857:     my $what = shift;
1.185     bowersj2 3858:     my $part = shift;
                   3859:     if (!defined($part)) { 
                   3860:         $part = '0'; 
                   3861:     }
1.51      bowersj2 3862:     return $self->{NAV_MAP}->parmval($part.'.'.$what, $self->symb());
                   3863: }
                   3864: 
1.70      bowersj2 3865: =pod
                   3866: 
                   3867: B<Map Methods>
                   3868: 
1.174     albertel 3869: These methods are useful for getting information about the map
                   3870: properties of the resource, if the resource is a map (B<is_map>).
1.70      bowersj2 3871: 
                   3872: =over 4
                   3873: 
1.174     albertel 3874: =item * B<map_finish>:
                   3875: 
                   3876: Returns a reference to a resource object corresponding to the finish
                   3877: resource of the map.
1.70      bowersj2 3878: 
1.174     albertel 3879: =item * B<map_pc>:
1.70      bowersj2 3880: 
1.174     albertel 3881: Returns the pc value of the map, which is the first number that
                   3882: appears in the resource ID of the resources in the map, and is the
                   3883: number that appears around the middle of the symbs of the resources in
                   3884: that map.
1.70      bowersj2 3885: 
1.174     albertel 3886: =item * B<map_start>:
                   3887: 
                   3888: Returns a reference to a resource object corresponding to the start
                   3889: resource of the map.
                   3890: 
                   3891: =item * B<map_type>:
                   3892: 
                   3893: Returns a string with the type of the map in it.
1.70      bowersj2 3894: 
1.444.2.2  raeburn  3895: =item *B<map_hierarchy>:
                   3896: 
                   3897: Returns a string with a comma-separated ordered list of map_pc IDs
                   3898: for the hierarchy of maps containing a map, with the top level
                   3899: map first, then descending to deeper levels, with the enclosing map last.
                   3900: 
1.70      bowersj2 3901: =back
1.51      bowersj2 3902: 
1.70      bowersj2 3903: =cut
1.51      bowersj2 3904: 
                   3905: sub map_finish {
                   3906:     my $self = shift;
                   3907:     my $src = $self->src();
1.381     albertel 3908:     $src = &Apache::lonnet::clutter($src);
1.51      bowersj2 3909:     my $res = $self->navHash("map_finish_$src", 0);
                   3910:     $res = $self->{NAV_MAP}->getById($res);
                   3911:     return $res;
                   3912: }
1.70      bowersj2 3913: sub map_pc {
                   3914:     my $self = shift;
1.381     albertel 3915:     my $src = $self->src();
1.70      bowersj2 3916:     return $self->navHash("map_pc_$src", 0);
                   3917: }
1.51      bowersj2 3918: sub map_start {
                   3919:     my $self = shift;
                   3920:     my $src = $self->src();
1.381     albertel 3921:     $src = &Apache::lonnet::clutter($src);
1.51      bowersj2 3922:     my $res = $self->navHash("map_start_$src", 0);
                   3923:     $res = $self->{NAV_MAP}->getById($res);
                   3924:     return $res;
                   3925: }
                   3926: sub map_type {
                   3927:     my $self = shift;
                   3928:     my $pc = $self->map_pc();
                   3929:     return $self->navHash("map_type_$pc", 0);
                   3930: }
1.444.2.2  raeburn  3931: sub map_hierarchy {
                   3932:     my $self = shift;
                   3933:     my $pc = $self->map_pc();
                   3934:     return $self->navHash("map_hierarchy_$pc", 0);
                   3935: }
                   3936: 
1.51      bowersj2 3937: 
                   3938: #####
                   3939: # Property queries
                   3940: #####
                   3941: 
                   3942: # These functions will be responsible for returning the CORRECT
                   3943: # VALUE for the parameter, no matter what. So while they may look
1.398     banghart 3944: # like direct calls to parmval, they can be more than that.
1.51      bowersj2 3945: # So, for instance, the duedate function should use the "duedatetype"
1.398     banghart 3946: # information, rather than the resource object user.
1.51      bowersj2 3947: 
                   3948: =pod
                   3949: 
                   3950: =head2 Resource Parameters
                   3951: 
1.174     albertel 3952: In order to use the resource parameters correctly, the nav map must
                   3953: have been instantiated with genCourseAndUserOptions set to true, so
                   3954: the courseopt and useropt is read correctly. Then, you can call these
                   3955: functions to get the relevant parameters for the resource. Each
                   3956: function defaults to part "0", but can be directed to another part by
                   3957: passing the part as the parameter.
                   3958: 
                   3959: These methods are responsible for getting the parameter correct, not
                   3960: merely reflecting the contents of the GDBM hashes. As we move towards
                   3961: dates relative to other dates, these methods should be updated to
                   3962: reflect that. (Then, anybody using these methods will not have to update
                   3963: their code.)
                   3964: 
                   3965: =over 4
                   3966: 
                   3967: =item * B<acc>:
                   3968: 
                   3969: Get the Client IP/Name Access Control information.
1.51      bowersj2 3970: 
1.174     albertel 3971: =item * B<answerdate>:
1.51      bowersj2 3972: 
1.174     albertel 3973: Get the answer-reveal date for the problem.
                   3974: 
1.211     bowersj2 3975: =item * B<awarded>: 
                   3976: 
                   3977: Gets the awarded value for the problem part. Requires genUserData set to
                   3978: true when the navmap object was created.
                   3979: 
1.174     albertel 3980: =item * B<duedate>:
                   3981: 
                   3982: Get the due date for the problem.
                   3983: 
                   3984: =item * B<tries>:
                   3985: 
                   3986: Get the number of tries the student has used on the problem.
                   3987: 
                   3988: =item * B<maxtries>:
                   3989: 
                   3990: Get the number of max tries allowed.
                   3991: 
                   3992: =item * B<opendate>:
1.51      bowersj2 3993: 
1.174     albertel 3994: Get the open date for the problem.
1.51      bowersj2 3995: 
1.174     albertel 3996: =item * B<sig>:
1.51      bowersj2 3997: 
1.174     albertel 3998: Get the significant figures setting.
1.51      bowersj2 3999: 
1.174     albertel 4000: =item * B<tol>:
1.51      bowersj2 4001: 
1.174     albertel 4002: Get the tolerance for the problem.
1.51      bowersj2 4003: 
1.174     albertel 4004: =item * B<tries>:
1.51      bowersj2 4005: 
1.174     albertel 4006: Get the number of tries the user has already used on the problem.
1.51      bowersj2 4007: 
1.174     albertel 4008: =item * B<type>:
1.51      bowersj2 4009: 
1.174     albertel 4010: Get the question type for the problem.
1.70      bowersj2 4011: 
1.174     albertel 4012: =item * B<weight>:
1.51      bowersj2 4013: 
1.174     albertel 4014: Get the weight for the problem.
1.51      bowersj2 4015: 
                   4016: =back
                   4017: 
                   4018: =cut
                   4019: 
                   4020: sub acc {
                   4021:     (my $self, my $part) = @_;
1.410     raeburn  4022:     my $acc = $self->parmval("acc", $part);
                   4023:     return $acc;
1.51      bowersj2 4024: }
                   4025: sub answerdate {
                   4026:     (my $self, my $part) = @_;
                   4027:     # Handle intervals
1.410     raeburn  4028:     my $answerdatetype = $self->parmval("answerdate.type", $part);
                   4029:     my $answerdate = $self->parmval("answerdate", $part);
                   4030:     my $duedate = $self->parmval("duedate", $part);
                   4031:     if ($answerdatetype eq 'date_interval') {
                   4032:         $answerdate = $duedate + $answerdate; 
1.51      bowersj2 4033:     }
1.410     raeburn  4034:     return $answerdate;
1.106     bowersj2 4035: }
1.211     bowersj2 4036: sub awarded { 
                   4037:     my $self = shift; my $part = shift;
1.221     bowersj2 4038:     $self->{NAV_MAP}->get_user_data();
1.211     bowersj2 4039:     if (!defined($part)) { $part = '0'; }
                   4040:     return $self->{NAV_MAP}->{STUDENT_DATA}->{$self->symb()}->{'resource.'.$part.'.awarded'};
                   4041: }
1.432     raeburn  4042: sub taskversion {
                   4043:     my $self = shift; my $part = shift;
                   4044:     $self->{NAV_MAP}->get_user_data();
                   4045:     if (!defined($part)) { $part = '0'; }
                   4046:     return $self->{NAV_MAP}->{STUDENT_DATA}->{$self->symb()}->{'resource.'.$part.'.version'};
                   4047: }
                   4048: sub taskstatus {
                   4049:     my $self = shift; my $part = shift;
                   4050:     $self->{NAV_MAP}->get_user_data();
                   4051:     if (!defined($part)) { $part = '0'; }
                   4052:     return $self->{NAV_MAP}->{STUDENT_DATA}->{$self->symb()}->{'resource.'.$self->taskversion($part).'.'.$part.'.status'};
                   4053: }
                   4054: sub solved {
                   4055:     my $self = shift; my $part = shift;
                   4056:     $self->{NAV_MAP}->get_user_data();
                   4057:     if (!defined($part)) { $part = '0'; }
                   4058:     return $self->{NAV_MAP}->{STUDENT_DATA}->{$self->symb()}->{'resource.'.$part.'.solved'};
                   4059: }
                   4060: sub checkedin {
                   4061:     my $self = shift; my $part = shift;
                   4062:     $self->{NAV_MAP}->get_user_data();
                   4063:     if (!defined($part)) { $part = '0'; }
                   4064:     if ($self->is_task()) {
                   4065:         my $version = $self->taskversion($part);
                   4066:         return ($self->{NAV_MAP}->{STUDENT_DATA}->{$self->symb()}->{'resource.'.$version .'.'.$part.'.checkedin'},$self->{NAV_MAP}->{STUDENT_DATA}->{$self->symb()}->{'resource.'.$version .'.'.$part.'.checkedin.slot'});
                   4067:     } else {
                   4068:         return ($self->{NAV_MAP}->{STUDENT_DATA}->{$self->symb()}->{'resource.'.$part.'.checkedin'},$self->{NAV_MAP}->{STUDENT_DATA}->{$self->symb()}->{'resource.'.$part.'.checkedin.slot'});
                   4069:     }
                   4070: }
1.382     albertel 4071: # this should work exactly like the copy in lonhomework.pm
1.51      bowersj2 4072: sub duedate {
                   4073:     (my $self, my $part) = @_;
1.382     albertel 4074:     my $date;
1.406     albertel 4075:     my @interval=$self->parmval("interval", $part);
1.382     albertel 4076:     my $due_date=$self->parmval("duedate", $part);
1.406     albertel 4077:     if ($interval[0] =~ /\d+/) {
                   4078:        my $first_access=&Apache::lonnet::get_first_access($interval[1],
                   4079:                                                           $self->symb);
1.382     albertel 4080: 	if (defined($first_access)) {
1.406     albertel 4081:            my $interval = $first_access+$interval[0];
1.404     albertel 4082: 	    $date = (!$due_date || $interval < $due_date) ? $interval 
                   4083:                                                           : $due_date;
1.382     albertel 4084: 	} else {
                   4085: 	    $date = $due_date;
                   4086: 	}
                   4087:     } else {
                   4088: 	$date = $due_date;
1.260     albertel 4089:     }
1.382     albertel 4090:     return $date;
1.51      bowersj2 4091: }
1.334     albertel 4092: sub handgrade {
                   4093:     (my $self, my $part) = @_;
1.399     albertel 4094:     my @response_ids = $self->responseIds($part);
                   4095:     if (@response_ids) {
                   4096: 	foreach my $response_id (@response_ids) {
1.410     raeburn  4097:             my $handgrade = $self->parmval("handgrade",$part.'_'.$response_id);
                   4098: 	    if (lc($handgrade) eq 'yes') {
1.399     albertel 4099: 		return 'yes';
                   4100: 	    }
                   4101: 	}
                   4102:     }
1.410     raeburn  4103:     my $handgrade = $self->parmval("handgrade", $part);
                   4104:     return $handgrade;
1.334     albertel 4105: }
1.51      bowersj2 4106: sub maxtries {
                   4107:     (my $self, my $part) = @_;
1.410     raeburn  4108:     my $maxtries = $self->parmval("maxtries", $part);
                   4109:     return $maxtries;
1.51      bowersj2 4110: }
                   4111: sub opendate {
                   4112:     (my $self, my $part) = @_;
1.410     raeburn  4113:     my $opendatetype = $self->parmval("opendate.type", $part);
                   4114:     my $opendate = $self->parmval("opendate", $part); 
                   4115:     if ($opendatetype eq 'date_interval') {
                   4116:         my $duedate = $self->duedate($part);
                   4117:         $opendate = $duedate - $opendate; 
1.51      bowersj2 4118:     }
1.410     raeburn  4119:     return $opendate;
1.51      bowersj2 4120: }
1.185     bowersj2 4121: sub problemstatus {
                   4122:     (my $self, my $part) = @_;
1.410     raeburn  4123:     my $problemstatus = $self->parmval("problemstatus", $part);
                   4124:     return lc($problemstatus);
1.185     bowersj2 4125: }
1.51      bowersj2 4126: sub sig {
                   4127:     (my $self, my $part) = @_;
1.410     raeburn  4128:     my $sig = $self->parmval("sig", $part);
                   4129:     return $sig;
1.51      bowersj2 4130: }
                   4131: sub tol {
                   4132:     (my $self, my $part) = @_;
1.410     raeburn  4133:     my $tol = $self->parmval("tol", $part);
                   4134:     return $tol;
1.51      bowersj2 4135: }
1.410     raeburn  4136: sub tries {
1.108     bowersj2 4137:     my $self = shift; 
                   4138:     my $tries = $self->queryRestoreHash('tries', shift);
                   4139:     if (!defined($tries)) { return '0';}
1.51      bowersj2 4140:     return $tries;
                   4141: }
1.70      bowersj2 4142: sub type {
                   4143:     (my $self, my $part) = @_;
1.410     raeburn  4144:     my $type = $self->parmval("type", $part);
                   4145:     return $type;
1.70      bowersj2 4146: }
1.109     bowersj2 4147: sub weight { 
                   4148:     my $self = shift; my $part = shift;
1.211     bowersj2 4149:     if (!defined($part)) { $part = '0'; }
1.409     raeburn  4150:     my $weight = &Apache::lonnet::EXT('resource.'.$part.'.weight',
                   4151:                                 $self->symb(), $env{'user.domain'},
                   4152:                                 $env{'user.name'},
                   4153:                                 $env{'request.course.sec'});
                   4154:     return $weight;
1.274     matthew  4155: }
                   4156: sub part_display {
                   4157:     my $self= shift(); my $partID = shift();
                   4158:     if (! defined($partID)) { $partID = '0'; }
                   4159:     my $display=&Apache::lonnet::EXT('resource.'.$partID.'.display',
                   4160:                                      $self->symb);
                   4161:     if (! defined($display) || $display eq '') {
                   4162:         $display = $partID;
                   4163:     }
                   4164:     return $display;
1.70      bowersj2 4165: }
1.432     raeburn  4166: sub slot_control {
                   4167:     my $self=shift(); my $part = shift();
                   4168:     if (!defined($part)) { $part = '0'; }
                   4169:     my $useslots = $self->parmval("useslots", $part);
                   4170:     my $availablestudent = $self->parmval("availablestudent", $part);
                   4171:     my $available = $self->parmval("available", $part); 
                   4172:     return ($useslots,$availablestudent,$available);
                   4173: }
1.51      bowersj2 4174: 
                   4175: # Multiple things need this
                   4176: sub getReturnHash {
                   4177:     my $self = shift;
                   4178:     
                   4179:     if (!defined($self->{RETURN_HASH})) {
1.84      bowersj2 4180:         my %tmpHash  = &Apache::lonnet::restore($self->symb());
1.51      bowersj2 4181:         $self->{RETURN_HASH} = \%tmpHash;
                   4182:     }
                   4183: }       
                   4184: 
                   4185: ######
                   4186: # Status queries
                   4187: ######
                   4188: 
                   4189: # These methods query the status of problems.
                   4190: 
                   4191: # If we need to count parts, this function determines the number of
                   4192: # parts from the metadata. When called, it returns a reference to a list
                   4193: # of strings corresponding to the parts. (Thus, using it in a scalar context
                   4194: # tells you how many parts you have in the problem:
                   4195: # $partcount = scalar($resource->countParts());
                   4196: # Don't use $self->{PARTS} directly because you don't know if it's been
                   4197: # computed yet.
                   4198: 
                   4199: =pod
                   4200: 
                   4201: =head2 Resource misc
                   4202: 
                   4203: Misc. functions for the resource.
                   4204: 
                   4205: =over 4
                   4206: 
1.174     albertel 4207: =item * B<hasDiscussion>:
1.59      bowersj2 4208: 
1.174     albertel 4209: Returns a false value if there has been discussion since the user last
                   4210: logged in, true if there has. Always returns false if the discussion
                   4211: data was not extracted when the nav map was constructed.
                   4212: 
1.366     albertel 4213: =item * B<last_post_time>:
                   4214: 
                   4215: Returns a false value if there hasn't been discussion otherwise returns
                   4216: unix timestamp of last time a discussion posting (or edit) was made.
                   4217: 
1.393     raeburn  4218: =item * B<discussion_info>:
1.366     albertel 4219: 
1.393     raeburn  4220: optional argument is a filter (currently can be 'unread');
                   4221: returns in scalar context the count of the number of discussion postings.
1.366     albertel 4222: 
                   4223: returns in list context both the count of postings and a hash ref
1.393     raeburn  4224: containing information about the postings (subject, id, timestamp) in a hash.
                   4225: 
                   4226: Default is to return counts for all postings.  However if called with a second argument set to 'unread', will return information about only unread postings.
1.366     albertel 4227: 
1.174     albertel 4228: =item * B<getFeedback>:
                   4229: 
                   4230: Gets the feedback for the resource and returns the raw feedback string
                   4231: for the resource, or the null string if there is no feedback or the
                   4232: email data was not extracted when the nav map was constructed. Usually
                   4233: used like this:
1.59      bowersj2 4234: 
1.394     raeburn  4235:  for my $url (split(/\,/, $res->getFeedback())) {
                   4236:     my $link = &escape($url);
1.59      bowersj2 4237:     ...
                   4238: 
                   4239: and use the link as appropriate.
                   4240: 
                   4241: =cut
                   4242: 
                   4243: sub hasDiscussion {
                   4244:     my $self = shift;
                   4245:     return $self->{NAV_MAP}->hasDiscussion($self->symb());
                   4246: }
                   4247: 
1.366     albertel 4248: sub last_post_time {
                   4249:     my $self = shift;
                   4250:     return $self->{NAV_MAP}->last_post_time($self->symb());
                   4251: }
                   4252: 
1.393     raeburn  4253: sub discussion_info {
                   4254:     my ($self,$filter) = @_;
                   4255:     return $self->{NAV_MAP}->discussion_info($self->symb(),$filter);
1.366     albertel 4256: }
                   4257: 
1.59      bowersj2 4258: sub getFeedback {
                   4259:     my $self = shift;
1.124     bowersj2 4260:     my $source = $self->src();
1.395     raeburn  4261:     my $symb = $self->symb();
1.125     bowersj2 4262:     if ($source =~ /^\/res\//) { $source = substr $source, 5; }
1.395     raeburn  4263:     return $self->{NAV_MAP}->getFeedback($symb,$source);
1.124     bowersj2 4264: }
                   4265: 
                   4266: sub getErrors {
                   4267:     my $self = shift;
                   4268:     my $source = $self->src();
1.395     raeburn  4269:     my $symb = $self->symb();
1.124     bowersj2 4270:     if ($source =~ /^\/res\//) { $source = substr $source, 5; }
1.395     raeburn  4271:     return $self->{NAV_MAP}->getErrors($symb,$source);
1.59      bowersj2 4272: }
                   4273: 
                   4274: =pod
                   4275: 
1.174     albertel 4276: =item * B<parts>():
1.51      bowersj2 4277: 
1.174     albertel 4278: Returns a list reference containing sorted strings corresponding to
1.193     bowersj2 4279: each part of the problem. Single part problems have only a part '0'.
                   4280: Multipart problems do not return their part '0', since they typically
                   4281: do not really matter. 
1.174     albertel 4282: 
                   4283: =item * B<countParts>():
                   4284: 
                   4285: Returns the number of parts of the problem a student can answer. Thus,
                   4286: for single part problems, returns 1. For multipart, it returns the
1.193     bowersj2 4287: number of parts in the problem, not including psuedo-part 0. 
1.51      bowersj2 4288: 
1.290     matthew  4289: =item * B<countResponses>():
                   4290: 
                   4291: Returns the total number of responses in the problem a student can answer.
                   4292: 
                   4293: =item * B<responseTypes>():
                   4294: 
                   4295: Returns a hash whose keys are the response types.  The values are the number 
                   4296: of times each response type is used.  This is for the I<entire> problem, not 
                   4297: just a single part.
                   4298: 
1.192     bowersj2 4299: =item * B<multipart>():
                   4300: 
1.193     bowersj2 4301: Returns true if the problem is multipart, false otherwise. Use this instead
                   4302: of countParts if all you want is multipart/not multipart.
1.192     bowersj2 4303: 
1.187     bowersj2 4304: =item * B<responseType>($part):
                   4305: 
                   4306: Returns the response type of the part, without the word "response" on the
                   4307: end. Example return values: 'string', 'essay', 'numeric', etc.
                   4308: 
1.193     bowersj2 4309: =item * B<responseIds>($part):
1.187     bowersj2 4310: 
1.193     bowersj2 4311: Retreives the response IDs for the given part as an array reference containing
                   4312: strings naming the response IDs. This may be empty.
1.187     bowersj2 4313: 
1.51      bowersj2 4314: =back
                   4315: 
                   4316: =cut
                   4317: 
                   4318: sub parts {
                   4319:     my $self = shift;
                   4320: 
1.192     bowersj2 4321:     if ($self->ext) { return []; }
1.67      bowersj2 4322: 
1.51      bowersj2 4323:     $self->extractParts();
                   4324:     return $self->{PARTS};
                   4325: }
                   4326: 
                   4327: sub countParts {
                   4328:     my $self = shift;
                   4329:     
                   4330:     my $parts = $self->parts();
1.191     bowersj2 4331: 
                   4332:     # If I left this here, then it's not necessary.
                   4333:     #my $delta = 0;
                   4334:     #for my $part (@$parts) {
                   4335:     #    if ($part eq '0') { $delta--; }
                   4336:     #}
1.66      bowersj2 4337: 
                   4338:     if ($self->{RESOURCE_ERROR}) {
                   4339:         return 0;
                   4340:     }
                   4341: 
1.191     bowersj2 4342:     return scalar(@{$parts}); # + $delta;
1.192     bowersj2 4343: }
                   4344: 
1.290     matthew  4345: sub countResponses {
                   4346:     my $self = shift;
                   4347:     my $count;
1.293     matthew  4348:     foreach my $part (@{$self->parts()}) {
                   4349:         $count+= scalar($self->responseIds($part));
1.290     matthew  4350:     }
                   4351:     return $count;
                   4352: }
                   4353: 
                   4354: sub responseTypes {
                   4355:     my $self = shift;
1.291     albertel 4356:     my %responses;
1.368     raeburn  4357:     foreach my $part (@{$self->parts()}) {
1.290     matthew  4358:         foreach my $responsetype ($self->responseType($part)) {
1.291     albertel 4359:             $responses{$responsetype}++ if (defined($responsetype));
1.290     matthew  4360:         }
                   4361:     }
1.291     albertel 4362:     return %responses;
1.290     matthew  4363: }
                   4364: 
1.192     bowersj2 4365: sub multipart {
                   4366:     my $self = shift;
                   4367:     return $self->countParts() > 1;
1.51      bowersj2 4368: }
                   4369: 
1.225     bowersj2 4370: sub singlepart {
                   4371:     my $self = shift;
                   4372:     return $self->countParts() == 1;
                   4373: }
                   4374: 
1.187     bowersj2 4375: sub responseType {
1.184     bowersj2 4376:     my $self = shift;
                   4377:     my $part = shift;
                   4378: 
                   4379:     $self->extractParts();
1.235     albertel 4380:     if (defined($self->{RESPONSE_TYPES}->{$part})) {
                   4381: 	return @{$self->{RESPONSE_TYPES}->{$part}};
                   4382:     } else {
                   4383: 	return undef;
                   4384:     }
1.187     bowersj2 4385: }
                   4386: 
1.193     bowersj2 4387: sub responseIds {
1.187     bowersj2 4388:     my $self = shift;
                   4389:     my $part = shift;
                   4390: 
                   4391:     $self->extractParts();
1.235     albertel 4392:     if (defined($self->{RESPONSE_IDS}->{$part})) {
                   4393: 	return @{$self->{RESPONSE_IDS}->{$part}};
                   4394:     } else {
                   4395: 	return undef;
                   4396:     }
1.184     bowersj2 4397: }
                   4398: 
                   4399: # Private function: Extracts the parts information, both part names and
1.187     bowersj2 4400: # part types, and saves it. 
1.51      bowersj2 4401: sub extractParts { 
                   4402:     my $self = shift;
                   4403:     
1.153     bowersj2 4404:     return if (defined($self->{PARTS}));
1.67      bowersj2 4405:     return if ($self->ext);
1.51      bowersj2 4406: 
                   4407:     $self->{PARTS} = [];
                   4408: 
1.181     bowersj2 4409:     my %parts;
                   4410: 
1.82      bowersj2 4411:     # Retrieve part count, if this is a problem
                   4412:     if ($self->is_problem()) {
1.240     albertel 4413: 	my $partorder = &Apache::lonnet::metadata($self->src(), 'partorder');
1.152     matthew  4414:         my $metadata = &Apache::lonnet::metadata($self->src(), 'packages');
1.181     bowersj2 4415: 
1.239     bowersj2 4416: 	if ($partorder) {
                   4417: 	    my @parts;
                   4418: 	    for my $part (split (/,/,$partorder)) {
                   4419: 		if (!Apache::loncommon::check_if_partid_hidden($part, $self->symb())) {
                   4420: 		    push @parts, $part;
1.241     albertel 4421: 		    $parts{$part} = 1;
1.239     bowersj2 4422: 		}
                   4423: 	    }
                   4424: 	    $self->{PARTS} = \@parts;
                   4425: 	} else {
                   4426: 	    if (!$metadata) {
                   4427: 		$self->{RESOURCE_ERROR} = 1;
                   4428: 		$self->{PARTS} = [];
                   4429: 		$self->{PART_TYPE} = {};
                   4430: 		return;
                   4431: 	    }
1.394     raeburn  4432: 	    foreach my $entry (split(/\,/,$metadata)) {
                   4433: 		if ($entry =~ /^(?:part|Task)_(.*)$/) {
1.239     bowersj2 4434: 		    my $part = $1;
                   4435: 		    # This floods the logs if it blows up
                   4436: 		    if (defined($parts{$part})) {
1.241     albertel 4437: 			&Apache::lonnet::logthis("$part multiply defined in metadata for " . $self->symb());
                   4438: 		    }
1.239     bowersj2 4439: 		    
                   4440: 		    # check to see if part is turned off.
                   4441: 		    
                   4442: 		    if (!Apache::loncommon::check_if_partid_hidden($part, $self->symb())) {
                   4443: 			$parts{$part} = 1;
                   4444: 		    }
                   4445: 		}
                   4446: 	    }
                   4447: 	    my @sortedParts = sort keys %parts;
                   4448: 	    $self->{PARTS} = \@sortedParts;
1.51      bowersj2 4449:         }
1.82      bowersj2 4450:         
1.187     bowersj2 4451: 
1.284     matthew  4452:         # These hashes probably do not need names that end with "Hash"....
1.187     bowersj2 4453:         my %responseIdHash;
                   4454:         my %responseTypeHash;
                   4455: 
1.189     bowersj2 4456: 
                   4457:         # Init the responseIdHash
1.394     raeburn  4458:         foreach my $part (@{$self->{PARTS}}) {
                   4459:             $responseIdHash{$part} = [];
1.189     bowersj2 4460:         }
                   4461: 
1.187     bowersj2 4462:         # Now, the unfortunate thing about this is that parts, part name, and
1.239     bowersj2 4463:         # response id are delimited by underscores, but both the part
1.187     bowersj2 4464:         # name and response id can themselves have underscores in them.
                   4465:         # So we have to use our knowlege of part names to figure out 
                   4466:         # where the part names begin and end, and even then, it is possible
                   4467:         # to construct ambiguous situations.
1.379     albertel 4468:         foreach my $data (split /,/, $metadata) {
                   4469:             if ($data =~ /^([a-zA-Z]+)response_(.*)/
                   4470: 		|| $data =~ /^(Task)_(.*)/) {
1.187     bowersj2 4471:                 my $responseType = $1;
                   4472:                 my $partStuff = $2;
                   4473:                 my $partIdSoFar = '';
                   4474:                 my @partChunks = split /_/, $partStuff;
                   4475:                 my $i = 0;
                   4476:                 for ($i = 0; $i < scalar(@partChunks); $i++) {
                   4477:                     if ($partIdSoFar) { $partIdSoFar .= '_'; }
                   4478:                     $partIdSoFar .= $partChunks[$i];
                   4479:                     if ($parts{$partIdSoFar}) {
                   4480:                         my @otherChunks = @partChunks[$i+1..$#partChunks];
                   4481:                         my $responseId = join('_', @otherChunks);
1.379     albertel 4482: 			if ($self->is_task()) {
                   4483: 			    push(@{$responseIdHash{$partIdSoFar}},
                   4484: 				 $partIdSoFar);
                   4485: 			} else {
                   4486: 			    push(@{$responseIdHash{$partIdSoFar}},
                   4487: 				 $responseId);
                   4488: 			}
                   4489:                         push(@{$responseTypeHash{$partIdSoFar}},
                   4490: 			     $responseType);
1.187     bowersj2 4491:                     }
                   4492:                 }
                   4493:             }
                   4494:         }
1.264     albertel 4495: 	my $resorder = &Apache::lonnet::metadata($self->src(),'responseorder');
1.284     matthew  4496:         #
                   4497:         # Reorder the arrays in the %responseIdHash and %responseTypeHash
1.264     albertel 4498: 	if ($resorder) {
                   4499: 	    my @resorder=split(/,/,$resorder);
                   4500: 	    foreach my $part (keys(%responseIdHash)) {
1.286     albertel 4501: 		my $i=0;
                   4502: 		my %resids = map { ($_,$i++) } @{ $responseIdHash{$part} };
1.264     albertel 4503: 		my @neworder;
                   4504: 		foreach my $possibleid (@resorder) {
                   4505: 		    if (exists($resids{$possibleid})) {
1.286     albertel 4506: 			push(@neworder,$resids{$possibleid});
1.264     albertel 4507: 		    }
                   4508: 		}
1.286     albertel 4509: 		my @ids;
                   4510: 		my @type;
                   4511: 		foreach my $element (@neworder) {
                   4512: 		    push (@ids,$responseIdHash{$part}->[$element]);
                   4513: 		    push (@type,$responseTypeHash{$part}->[$element]);
                   4514: 		}
                   4515: 		$responseIdHash{$part}=\@ids;
                   4516: 		$responseTypeHash{$part}=\@type;
1.264     albertel 4517: 	    }
                   4518: 	}
1.187     bowersj2 4519:         $self->{RESPONSE_IDS} = \%responseIdHash;
                   4520:         $self->{RESPONSE_TYPES} = \%responseTypeHash;
1.154     bowersj2 4521:     }
                   4522: 
1.51      bowersj2 4523:     return;
                   4524: }
                   4525: 
                   4526: =pod
                   4527: 
                   4528: =head2 Resource Status
                   4529: 
1.174     albertel 4530: Problem resources have status information, reflecting their various
                   4531: dates and completion statuses.
1.51      bowersj2 4532: 
1.174     albertel 4533: There are two aspects to the status: the date-related information and
                   4534: the completion information.
1.51      bowersj2 4535: 
1.174     albertel 4536: Idiomatic usage of these two methods would probably look something
                   4537: like
1.51      bowersj2 4538: 
1.394     raeburn  4539:  foreach my $part ($resource->parts()) {
                   4540:     my $dateStatus = $resource->getDateStatus($part);
                   4541:     my $completionStatus = $resource->getCompletionStatus($part);
1.51      bowersj2 4542: 
1.70      bowersj2 4543:     or
                   4544: 
1.394     raeburn  4545:     my $status = $resource->status($part);
1.70      bowersj2 4546: 
1.51      bowersj2 4547:     ... use it here ...
                   4548:  }
                   4549: 
1.174     albertel 4550: Which you use depends on exactly what you are looking for. The
                   4551: status() function has been optimized for the nav maps display and may
                   4552: not precisely match what you need elsewhere.
1.101     bowersj2 4553: 
1.174     albertel 4554: The symbolic constants shown below can be accessed through the
                   4555: resource object: C<$res->OPEN>.
1.101     bowersj2 4556: 
1.51      bowersj2 4557: =over 4
                   4558: 
1.174     albertel 4559: =item * B<getDateStatus>($part):
                   4560: 
                   4561: ($part defaults to 0). A convenience function that returns a symbolic
                   4562: constant telling you about the date status of the part. The possible
                   4563: return values are:
1.51      bowersj2 4564: 
                   4565: =back
                   4566: 
                   4567: B<Date Codes>
                   4568: 
                   4569: =over 4
                   4570: 
1.174     albertel 4571: =item * B<OPEN_LATER>:
                   4572: 
                   4573: The problem will be opened later.
                   4574: 
                   4575: =item * B<OPEN>:
                   4576: 
                   4577: Open and not yet due.
                   4578: 
1.51      bowersj2 4579: 
1.174     albertel 4580: =item * B<PAST_DUE_ANSWER_LATER>:
1.51      bowersj2 4581: 
1.174     albertel 4582: The due date has passed, but the answer date has not yet arrived.
1.59      bowersj2 4583: 
1.174     albertel 4584: =item * B<PAST_DUE_NO_ANSWER>:
1.54      bowersj2 4585: 
1.174     albertel 4586: The due date has passed and there is no answer opening date set.
1.51      bowersj2 4587: 
1.174     albertel 4588: =item * B<ANSWER_OPEN>:
1.51      bowersj2 4589: 
1.174     albertel 4590: The answer date is here.
                   4591: 
                   4592: =item * B<NETWORK_FAILURE>:
                   4593: 
                   4594: The information is unknown due to network failure.
1.51      bowersj2 4595: 
                   4596: =back
                   4597: 
                   4598: =cut
                   4599: 
                   4600: # Apparently the compiler optimizes these into constants automatically
1.54      bowersj2 4601: sub OPEN_LATER             { return 0; }
                   4602: sub OPEN                   { return 1; }
                   4603: sub PAST_DUE_NO_ANSWER     { return 2; }
                   4604: sub PAST_DUE_ANSWER_LATER  { return 3; }
                   4605: sub ANSWER_OPEN            { return 4; }
1.432     raeburn  4606: sub NOTHING_SET            { return 5; }
1.54      bowersj2 4607: sub NETWORK_FAILURE        { return 100; }
                   4608: 
                   4609: # getDateStatus gets the date status for a given problem part. 
                   4610: # Because answer date, due date, and open date are fully independent
                   4611: # (i.e., it is perfectly possible to *only* have an answer date), 
                   4612: # we have to completely cover the 3x3 maxtrix of (answer, due, open) x
                   4613: # (past, future, none given). This function handles this with a decision
                   4614: # tree. Read the comments to follow the decision tree.
1.51      bowersj2 4615: 
                   4616: sub getDateStatus {
                   4617:     my $self = shift;
                   4618:     my $part = shift;
                   4619:     $part = "0" if (!defined($part));
1.54      bowersj2 4620: 
                   4621:     # Always return network failure if there was one.
1.51      bowersj2 4622:     return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
                   4623: 
                   4624:     my $now = time();
                   4625: 
1.53      bowersj2 4626:     my $open = $self->opendate($part);
                   4627:     my $due = $self->duedate($part);
                   4628:     my $answer = $self->answerdate($part);
                   4629: 
                   4630:     if (!$open && !$due && !$answer) {
                   4631:         # no data on the problem at all
                   4632:         # should this be the same as "open later"? think multipart.
                   4633:         return $self->NOTHING_SET;
                   4634:     }
1.59      bowersj2 4635:     if (!$open || $now < $open) {return $self->OPEN_LATER}
                   4636:     if (!$due || $now < $due) {return $self->OPEN}
                   4637:     if ($answer && $now < $answer) {return $self->PAST_DUE_ANSWER_LATER}
                   4638:     if ($answer) { return $self->ANSWER_OPEN; }
1.54      bowersj2 4639:     return PAST_DUE_NO_ANSWER;
1.51      bowersj2 4640: }
                   4641: 
                   4642: =pod
                   4643: 
                   4644: B<>
                   4645: 
                   4646: =over 4
                   4647: 
1.174     albertel 4648: =item * B<getCompletionStatus>($part):
1.51      bowersj2 4649: 
1.174     albertel 4650: ($part defaults to 0.) A convenience function that returns a symbolic
                   4651: constant telling you about the completion status of the part, with the
                   4652: following possible results:
                   4653: 
                   4654: =back
1.51      bowersj2 4655: 
                   4656: B<Completion Codes>
                   4657: 
                   4658: =over 4
                   4659: 
1.174     albertel 4660: =item * B<NOT_ATTEMPTED>:
                   4661: 
                   4662: Has not been attempted at all.
                   4663: 
                   4664: =item * B<INCORRECT>:
                   4665: 
                   4666: Attempted, but wrong by student.
1.51      bowersj2 4667: 
1.174     albertel 4668: =item * B<INCORRECT_BY_OVERRIDE>:
1.51      bowersj2 4669: 
1.174     albertel 4670: Attempted, but wrong by instructor override.
1.51      bowersj2 4671: 
1.174     albertel 4672: =item * B<CORRECT>:
1.51      bowersj2 4673: 
1.174     albertel 4674: Correct or correct by instructor.
1.51      bowersj2 4675: 
1.174     albertel 4676: =item * B<CORRECT_BY_OVERRIDE>:
1.51      bowersj2 4677: 
1.174     albertel 4678: Correct by instructor override.
1.51      bowersj2 4679: 
1.174     albertel 4680: =item * B<EXCUSED>:
                   4681: 
                   4682: Excused. Not yet implemented.
                   4683: 
                   4684: =item * B<NETWORK_FAILURE>:
                   4685: 
                   4686: Information not available due to network failure.
                   4687: 
                   4688: =item * B<ATTEMPTED>:
                   4689: 
                   4690: Attempted, and not yet graded.
1.69      bowersj2 4691: 
1.444.2.2  raeburn  4692: =item * B<CREDIT_ATTEMPTED>:
                   4693: 
                   4694: Attempted, and credit received for attempt (survey and anonymous survey only).
                   4695: 
1.51      bowersj2 4696: =back
                   4697: 
                   4698: =cut
                   4699: 
1.53      bowersj2 4700: sub NOT_ATTEMPTED         { return 10; }
                   4701: sub INCORRECT             { return 11; }
                   4702: sub INCORRECT_BY_OVERRIDE { return 12; }
                   4703: sub CORRECT               { return 13; }
                   4704: sub CORRECT_BY_OVERRIDE   { return 14; }
                   4705: sub EXCUSED               { return 15; }
1.69      bowersj2 4706: sub ATTEMPTED             { return 16; }
1.444.2.2  raeburn  4707: sub CREDIT_ATTEMPTED      { return 17; }
1.51      bowersj2 4708: 
                   4709: sub getCompletionStatus {
                   4710:     my $self = shift;
1.332     albertel 4711:     my $part = shift;
1.51      bowersj2 4712:     return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
                   4713: 
1.332     albertel 4714:     my $status = $self->queryRestoreHash('solved', $part);
1.51      bowersj2 4715: 
1.251     www      4716:     # Left as separate if statements in case we ever do more with this
1.51      bowersj2 4717:     if ($status eq 'correct_by_student') {return $self->CORRECT;}
1.288     albertel 4718:     if ($status eq 'correct_by_scantron') {return $self->CORRECT;}
1.332     albertel 4719:     if ($status eq 'correct_by_override') {
                   4720: 	return $self->CORRECT_BY_OVERRIDE;
                   4721:     }
1.51      bowersj2 4722:     if ($status eq 'incorrect_attempted') {return $self->INCORRECT; }
                   4723:     if ($status eq 'incorrect_by_override') {return $self->INCORRECT_BY_OVERRIDE; }
                   4724:     if ($status eq 'excused') {return $self->EXCUSED; }
1.69      bowersj2 4725:     if ($status eq 'ungraded_attempted') {return $self->ATTEMPTED; }
1.444.2.2  raeburn  4726:     if ($status eq 'credit_attempted') {
                   4727:         if ($self->is_anonsurvey($part) || $self->is_survey($part)) {
                   4728:             return $self->CREDIT_ATTEMPTED;
                   4729:         } else {
                   4730:             return $self->ATTEMPTED;
                   4731:         }
                   4732:     }
1.51      bowersj2 4733:     return $self->NOT_ATTEMPTED;
1.108     bowersj2 4734: }
                   4735: 
                   4736: sub queryRestoreHash {
                   4737:     my $self = shift;
                   4738:     my $hashentry = shift;
                   4739:     my $part = shift;
1.185     bowersj2 4740:     $part = "0" if (!defined($part) || $part eq '');
1.108     bowersj2 4741:     return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
                   4742: 
                   4743:     $self->getReturnHash();
                   4744: 
                   4745:     return $self->{RETURN_HASH}->{'resource.'.$part.'.'.$hashentry};
1.51      bowersj2 4746: }
                   4747: 
                   4748: =pod
                   4749: 
                   4750: B<Composite Status>
                   4751: 
1.174     albertel 4752: Along with directly returning the date or completion status, the
                   4753: resource object includes a convenience function B<status>() that will
                   4754: combine the two status tidbits into one composite status that can
1.191     bowersj2 4755: represent the status of the resource as a whole. This method represents
                   4756: the concept of the thing we want to display to the user on the nav maps
                   4757: screen, which is a combination of completion and open status. The precise logic is
1.174     albertel 4758: documented in the comments of the status method. The following results
                   4759: may be returned, all available as methods on the resource object
1.185     bowersj2 4760: ($res->NETWORK_FAILURE): In addition to the return values that match
                   4761: the date or completion status, this function can return "ANSWER_SUBMITTED"
                   4762: if that problemstatus parameter value is set to No, suppressing the
                   4763: incorrect/correct feedback.
1.51      bowersj2 4764: 
                   4765: =over 4
                   4766: 
1.174     albertel 4767: =item * B<NETWORK_FAILURE>:
                   4768: 
                   4769: The network has failed and the information is not available.
1.51      bowersj2 4770: 
1.174     albertel 4771: =item * B<NOTHING_SET>:
1.53      bowersj2 4772: 
1.174     albertel 4773: No dates have been set for this problem (part) at all. (Because only
                   4774: certain parts of a multi-part problem may be assigned, this can not be
                   4775: collapsed into "open later", as we do not know a given part will EVER
                   4776: be opened. For single part, this is the same as "OPEN_LATER".)
1.51      bowersj2 4777: 
1.174     albertel 4778: =item * B<CORRECT>:
1.51      bowersj2 4779: 
1.174     albertel 4780: For any reason at all, the part is considered correct.
1.54      bowersj2 4781: 
1.174     albertel 4782: =item * B<EXCUSED>:
1.51      bowersj2 4783: 
1.174     albertel 4784: For any reason at all, the problem is excused.
1.51      bowersj2 4785: 
1.174     albertel 4786: =item * B<PAST_DUE_NO_ANSWER>:
1.51      bowersj2 4787: 
1.174     albertel 4788: The problem is past due, not considered correct, and no answer date is
                   4789: set.
1.51      bowersj2 4790: 
1.174     albertel 4791: =item * B<PAST_DUE_ANSWER_LATER>:
1.51      bowersj2 4792: 
1.174     albertel 4793: The problem is past due, not considered correct, and an answer date in
                   4794: the future is set.
1.51      bowersj2 4795: 
1.174     albertel 4796: =item * B<ANSWER_OPEN>:
                   4797: 
                   4798: The problem is past due, not correct, and the answer is now available.
                   4799: 
                   4800: =item * B<OPEN_LATER>:
                   4801: 
                   4802: The problem is not yet open.
                   4803: 
                   4804: =item * B<TRIES_LEFT>:
                   4805: 
                   4806: The problem is open, has been tried, is not correct, but there are
                   4807: tries left.
                   4808: 
                   4809: =item * B<INCORRECT>:
                   4810: 
                   4811: The problem is open, and all tries have been used without getting the
                   4812: correct answer.
                   4813: 
                   4814: =item * B<OPEN>:
                   4815: 
                   4816: The item is open and not yet tried.
                   4817: 
                   4818: =item * B<ATTEMPTED>:
                   4819: 
                   4820: The problem has been attempted.
1.69      bowersj2 4821: 
1.444.2.2  raeburn  4822: =item * B<CREDIT_ATTEMPTED>:
                   4823: 
                   4824: The problem has been attempted, and credit given for the attempt (survey and anonymous survey only).
                   4825: 
1.185     bowersj2 4826: =item * B<ANSWER_SUBMITTED>:
                   4827: 
                   4828: An answer has been submitted, but the student should not see it.
                   4829: 
1.51      bowersj2 4830: =back
                   4831: 
                   4832: =cut
                   4833: 
1.432     raeburn  4834: sub TRIES_LEFT        { return 20; }
                   4835: sub ANSWER_SUBMITTED  { return 21; }
                   4836: sub PARTIALLY_CORRECT { return 22; }
                   4837: 
                   4838: sub RESERVED_LATER    { return 30; }
                   4839: sub RESERVED          { return 31; }
                   4840: sub RESERVED_LOCATION { return 32; }
                   4841: sub RESERVABLE        { return 33; }
                   4842: sub RESERVABLE_LATER  { return 34; }
                   4843: sub NOTRESERVABLE     { return 35; }
                   4844: sub NOT_IN_A_SLOT     { return 36; }
                   4845: sub NEEDS_CHECKIN     { return 37; }
                   4846: sub WAITING_FOR_GRADE { return 38; }
                   4847: sub UNKNOWN           { return 39; }
1.51      bowersj2 4848: 
                   4849: sub status {
                   4850:     my $self = shift;
                   4851:     my $part = shift;
                   4852:     if (!defined($part)) { $part = "0"; }
                   4853:     my $completionStatus = $self->getCompletionStatus($part);
                   4854:     my $dateStatus = $self->getDateStatus($part);
                   4855: 
                   4856:     # What we have is a two-dimensional matrix with 4 entries on one
                   4857:     # dimension and 5 entries on the other, which we want to colorize,
1.54      bowersj2 4858:     # plus network failure and "no date data at all".
1.51      bowersj2 4859: 
1.222     bowersj2 4860:     #if ($self->{RESOURCE_ERROR}) { return NETWORK_FAILURE; }
1.53      bowersj2 4861:     if ($completionStatus == NETWORK_FAILURE) { return NETWORK_FAILURE; }
1.51      bowersj2 4862: 
1.408     raeburn  4863:     my $suppressFeedback = 0;
                   4864:     if (($self->problemstatus($part) eq 'no') ||
                   4865:         ($self->problemstatus($part) eq 'no_feedback_ever')) {
                   4866:         $suppressFeedback = 1;
                   4867:     }
1.236     bowersj2 4868:     # If there's an answer date and we're past it, don't
                   4869:     # suppress the feedback; student should know
1.330     albertel 4870:     if ($self->duedate($part) && $self->duedate($part) < time() &&
                   4871: 	$self->answerdate($part) && $self->answerdate($part) < time()) {
1.236     bowersj2 4872: 	$suppressFeedback = 0;
                   4873:     }
1.185     bowersj2 4874: 
1.51      bowersj2 4875:     # There are a few whole rows we can dispose of:
1.53      bowersj2 4876:     if ($completionStatus == CORRECT ||
                   4877:         $completionStatus == CORRECT_BY_OVERRIDE ) {
1.332     albertel 4878: 	if ( $suppressFeedback ) { return ANSWER_SUBMITTED }
                   4879: 	my $awarded=$self->awarded($part);
                   4880: 	if ($awarded < 1 && $awarded > 0) {
                   4881:             return PARTIALLY_CORRECT;
                   4882: 	} elsif ($awarded<1) {
                   4883: 	    return INCORRECT;
                   4884: 	}
                   4885: 	return CORRECT; 
1.69      bowersj2 4886:     }
                   4887: 
1.343     albertel 4888:     # If it's WRONG... and not open
                   4889:     if ( ($completionStatus == INCORRECT || 
                   4890: 	  $completionStatus == INCORRECT_BY_OVERRIDE)
                   4891: 	 && (!$self->opendate($part) ||  $self->opendate($part) > time()) ) {
                   4892: 	return INCORRECT;
                   4893:     }
                   4894: 
1.69      bowersj2 4895:     if ($completionStatus == ATTEMPTED) {
                   4896:         return ATTEMPTED;
1.53      bowersj2 4897:     }
                   4898: 
1.444.2.2  raeburn  4899:     if ($completionStatus == CREDIT_ATTEMPTED) {
                   4900:         return CREDIT_ATTEMPTED;
                   4901:     }
                   4902: 
1.53      bowersj2 4903:     # If it's EXCUSED, then return that no matter what
                   4904:     if ($completionStatus == EXCUSED) {
                   4905:         return EXCUSED; 
1.51      bowersj2 4906:     }
                   4907: 
1.53      bowersj2 4908:     if ($dateStatus == NOTHING_SET) {
                   4909:         return NOTHING_SET;
1.51      bowersj2 4910:     }
                   4911: 
1.69      bowersj2 4912:     # Now we're down to a 4 (incorrect, incorrect_override, not_attempted)
                   4913:     # by 4 matrix (date statuses).
1.51      bowersj2 4914: 
1.54      bowersj2 4915:     if ($dateStatus == PAST_DUE_ANSWER_LATER ||
1.59      bowersj2 4916:         $dateStatus == PAST_DUE_NO_ANSWER ) {
1.272     albertel 4917:         return $suppressFeedback ? ANSWER_SUBMITTED : $dateStatus; 
1.51      bowersj2 4918:     }
                   4919: 
1.53      bowersj2 4920:     if ($dateStatus == ANSWER_OPEN) {
                   4921:         return ANSWER_OPEN;
1.51      bowersj2 4922:     }
                   4923: 
                   4924:     # Now: (incorrect, incorrect_override, not_attempted) x 
                   4925:     # (open_later), (open)
                   4926:     
1.53      bowersj2 4927:     if ($dateStatus == OPEN_LATER) {
                   4928:         return OPEN_LATER;
1.51      bowersj2 4929:     }
                   4930: 
                   4931:     # If it's WRONG...
1.53      bowersj2 4932:     if ($completionStatus == INCORRECT || $completionStatus == INCORRECT_BY_OVERRIDE) {
1.51      bowersj2 4933:         # and there are TRIES LEFT:
1.79      bowersj2 4934:         if ($self->tries($part) < $self->maxtries($part) || !$self->maxtries($part)) {
1.222     bowersj2 4935:             return $suppressFeedback ? ANSWER_SUBMITTED : TRIES_LEFT;
1.51      bowersj2 4936:         }
1.185     bowersj2 4937:         return $suppressFeedback ? ANSWER_SUBMITTED : INCORRECT; # otherwise, return orange; student can't fix this
1.51      bowersj2 4938:     }
                   4939: 
                   4940:     # Otherwise, it's untried and open
1.53      bowersj2 4941:     return OPEN; 
1.224     bowersj2 4942: }
                   4943: 
1.432     raeburn  4944: sub check_for_slot {
                   4945:     my $self = shift;
                   4946:     my $part = shift;
                   4947:     my ($use_slots,$available,$availablestudent) = $self->slot_control($part);
                   4948:     if (($use_slots ne '') && ($use_slots !~ /^\s*no\s*$/i)) {
                   4949:         my @slots = (split(/:/,$availablestudent),split(/:/,$available));
                   4950:         my $cid=$env{'request.course.id'};
                   4951:         my $cdom=$env{'course.'.$cid.'.domain'};
                   4952:         my $cnum=$env{'course.'.$cid.'.num'};
                   4953:         my $now = time;
                   4954:         if (@slots > 0) {
                   4955:             my %slots=&Apache::lonnet::get('slots',[@slots],$cdom,$cnum);
                   4956:             if (&Apache::lonnet::error(%slots)) {
                   4957:                 return (UNKNOWN);
                   4958:             }
                   4959:             my @sorted_slots = &Apache::loncommon::sorted_slots(\@slots,\%slots);
                   4960:             my ($checkedin,$checkedinslot);
                   4961:             foreach my $slot_name (@sorted_slots) {
                   4962:                 next if (!defined($slots{$slot_name}) ||
                   4963:                          !ref($slots{$slot_name}));
                   4964:                 my $end = $slots{$slot_name}->{'endtime'};
                   4965:                 my $start = $slots{$slot_name}->{'starttime'};
                   4966:                 my $ip = $slots{$slot_name}->{'ip'};
                   4967:                 if ($self->simpleStatus() == OPEN) {
                   4968:                     my $startreserve = $slots{$slot_name}->{'startreserve'};
                   4969:                     my @proctors;
                   4970:                     if ($slots{$slot_name}->{'proctor'} ne '') {
                   4971:                         @proctors = split(',',$slots{$slot_name}->{'proctor'});
                   4972:                     }
                   4973:                     if ($end > $now) {
                   4974:                         ($checkedin,$checkedinslot) = $self->checkedin();
                   4975:                         if ($startreserve < $now) {
                   4976:                             if ($start > $now) {
                   4977:                                 return (RESERVED_LATER,$start,$slot_name);
                   4978:                             } else {
                   4979:                                 if ($ip ne '') {
                   4980:                                     if (!&Apache::loncommon::check_ip_acc($ip)) {
                   4981:                                         return (RESERVED_LOCATION,$ip,$slot_name);
                   4982:                                     }
                   4983:                                 } 
                   4984:                                 if (@proctors > 0) {
                   4985:                                     unless ((grep(/^\Q$checkedin\E/,@proctors)) &&
                   4986:                                         ($checkedinslot eq $slot_name)) {
                   4987:                                         return (NEEDS_CHECKIN,undef,$slot_name); 
                   4988:                                     }
                   4989:                                 }
                   4990:                                 return (RESERVED,$end,$slot_name);
                   4991:                             }
                   4992:                         } else {
                   4993:                             if ($start > $now) {
                   4994:                                 return (RESERVABLE,$startreserve,$slot_name);
                   4995:                             }
                   4996:                         }
                   4997:                     }
                   4998:                 }
                   4999:             }
                   5000:             my ($is_correct,$got_grade);
                   5001:             if ($self->is_task()) {
                   5002:                 my $taskstatus = $self->taskstatus();
                   5003:                 $is_correct = (($taskstatus eq 'pass') || 
                   5004:                                ($self->solved() =~ /^correct_/));
1.444.2.4! raeburn  5005:                 $got_grade = ($taskstatus =~ /^(?:pass|fail)$/);
1.432     raeburn  5006:             } else {
                   5007:                 $got_grade = 1;
                   5008:                 $is_correct = ($self->solved() =~ /^correct_/);   
                   5009:             }
                   5010:             ($checkedin,$checkedinslot) = $self->checkedin();
                   5011:             if ($checkedin) {
                   5012:                 if (!$got_grade) {
                   5013:                     return (WAITING_FOR_GRADE);
                   5014:                 } elsif ($is_correct) {
                   5015:                     return (CORRECT); 
                   5016:                 }
                   5017:             }
                   5018:             return(NOT_IN_A_SLOT);
                   5019:         } else {
                   5020:             if (!$future_slots_checked) {
                   5021:                 $future_slots = &get_future_slots($cdom,$cnum,$now);
                   5022:                 $future_slots_checked = 1;
                   5023:             }
                   5024:             if ($future_slots) {
                   5025:                 return(NOT_IN_A_SLOT);
                   5026:             }
                   5027:             return(NOTRESERVABLE);
                   5028:         }
                   5029:     }
                   5030:     return;
                   5031: }
                   5032: 
                   5033: sub get_future_slots {
                   5034:     my ($cdom,$cnum,$now) = @_;
                   5035:     my %slots=&Apache::lonnet::dump('slots',$cdom,$cnum);
                   5036:     my $future_slots = 0;
                   5037:     foreach my $slot (keys(%slots)) {
                   5038:         if (($slots{$slot}->{'starttime'} > $now) &&
                   5039:             ($slots{$slot}->{'endtime'} > $now)) {
                   5040:             $future_slots ++;
                   5041:         }
                   5042:     }
                   5043:     return $future_slots;
                   5044: }
                   5045: 
1.224     bowersj2 5046: sub CLOSED { return 23; }
                   5047: sub ERROR { return 24; }
                   5048: 
                   5049: =pod
                   5050: 
                   5051: B<Simple Status>
                   5052: 
                   5053: Convenience method B<simpleStatus> provides a "simple status" for the resource.
                   5054: "Simple status" corresponds to "which icon is shown on the
                   5055: Navmaps". There are six "simple" statuses:
                   5056: 
                   5057: =over 4
                   5058: 
                   5059: =item * B<CLOSED>: The problem is currently closed. (No icon shown.)
                   5060: 
                   5061: =item * B<OPEN>: The problem is open and unattempted.
                   5062: 
                   5063: =item * B<CORRECT>: The problem is correct for any reason.
                   5064: 
                   5065: =item * B<INCORRECT>: The problem is incorrect and can still be
                   5066: completed successfully.
                   5067: 
                   5068: =item * B<ATTEMPTED>: The problem has been attempted, but the student
                   5069: does not know if they are correct. (The ellipsis icon.)
                   5070: 
                   5071: =item * B<ERROR>: There is an error retrieving information about this
                   5072: problem.
                   5073: 
                   5074: =back
                   5075: 
                   5076: =cut
                   5077: 
                   5078: # This hash maps the composite status to this simple status, and
                   5079: # can be used directly, if you like
                   5080: my %compositeToSimple = 
                   5081:     (
                   5082:       NETWORK_FAILURE()       => ERROR,
                   5083:       NOTHING_SET()           => CLOSED,
                   5084:       CORRECT()               => CORRECT,
1.332     albertel 5085:       PARTIALLY_CORRECT()     => PARTIALLY_CORRECT,
1.224     bowersj2 5086:       EXCUSED()               => CORRECT,
                   5087:       PAST_DUE_NO_ANSWER()    => INCORRECT,
                   5088:       PAST_DUE_ANSWER_LATER() => INCORRECT,
                   5089:       ANSWER_OPEN()           => INCORRECT,
                   5090:       OPEN_LATER()            => CLOSED,
                   5091:       TRIES_LEFT()            => OPEN,
                   5092:       INCORRECT()             => INCORRECT,
                   5093:       OPEN()                  => OPEN,
                   5094:       ATTEMPTED()             => ATTEMPTED,
1.444.2.2  raeburn  5095:       CREDIT_ATTEMPTED()      => CORRECT,
1.224     bowersj2 5096:       ANSWER_SUBMITTED()      => ATTEMPTED
                   5097:      );
                   5098: 
                   5099: sub simpleStatus {
                   5100:     my $self = shift;
                   5101:     my $part = shift;
                   5102:     my $status = $self->status($part);
                   5103:     return $compositeToSimple{$status};
1.225     bowersj2 5104: }
                   5105: 
                   5106: =pod
                   5107: 
                   5108: B<simpleStatusCount> will return an array reference containing, in
                   5109: this order, the number of OPEN, CLOSED, CORRECT, INCORRECT, ATTEMPTED,
                   5110: and ERROR parts the given problem has.
                   5111: 
                   5112: =cut
                   5113:     
                   5114: # This maps the status to the slot we want to increment
                   5115: my %statusToSlotMap = 
                   5116:     (
                   5117:      OPEN()      => 0,
                   5118:      CLOSED()    => 1,
                   5119:      CORRECT()   => 2,
                   5120:      INCORRECT() => 3,
                   5121:      ATTEMPTED() => 4,
                   5122:      ERROR()     => 5
                   5123:      );
                   5124: 
                   5125: sub statusToSlot { return $statusToSlotMap{shift()}; }
                   5126: 
                   5127: sub simpleStatusCount {
                   5128:     my $self = shift;
                   5129: 
                   5130:     my @counts = (0, 0, 0, 0, 0, 0, 0);
                   5131:     foreach my $part (@{$self->parts()}) {
                   5132: 	$counts[$statusToSlotMap{$self->simpleStatus($part)}]++;
                   5133:     }
                   5134: 
                   5135:     return \@counts;
1.191     bowersj2 5136: }
                   5137: 
                   5138: =pod
                   5139: 
                   5140: B<Completable>
                   5141: 
                   5142: The completable method represents the concept of I<whether the student can
                   5143: currently do the problem>. If the student can do the problem, which means
                   5144: that it is open, there are tries left, and if the problem is manually graded
                   5145: or the grade is suppressed via problemstatus, the student has not tried it
                   5146: yet, then the method returns 1. Otherwise, it returns 0, to indicate that 
                   5147: either the student has tried it and there is no feedback, or that for
                   5148: some reason it is no longer completable (not open yet, successfully completed,
                   5149: out of tries, etc.). As an example, this is used as the filter for the
                   5150: "Uncompleted Homework" option for the nav maps.
                   5151: 
                   5152: If this does not quite meet your needs, do not fiddle with it (unless you are
                   5153: fixing it to better match the student's conception of "completable" because
                   5154: it's broken somehow)... make a new method.
                   5155: 
                   5156: =cut
                   5157: 
                   5158: sub completable {
                   5159:     my $self = shift;
                   5160:     if (!$self->is_problem()) { return 0; }
                   5161:     my $partCount = $self->countParts();
                   5162: 
                   5163:     foreach my $part (@{$self->parts()}) {
                   5164:         if ($part eq '0' && $partCount != 1) { next; }
                   5165:         my $status = $self->status($part);
                   5166:         # "If any of the parts are open, or have tries left (implies open),
                   5167:         # and it is not "attempted" (manually graded problem), it is
                   5168:         # not "complete"
1.444.2.2  raeburn  5169:         if ($self->getCompletionStatus($part) == ATTEMPTED() ||
                   5170:             $self->getCompletionStatus($part) == CREDIT_ATTEMPTED() ||
                   5171:             $status == ANSWER_SUBMITTED() ) {
1.216     bowersj2 5172: 	    # did this part already, as well as we can
                   5173: 	    next;
                   5174: 	}
                   5175: 	if ($status == OPEN() || $status == TRIES_LEFT()) {
                   5176: 	    return 1;
                   5177: 	}
1.191     bowersj2 5178:     }
                   5179:         
                   5180:     # If all the parts were complete, so was this problem.
1.216     bowersj2 5181:     return 0;
1.51      bowersj2 5182: }
                   5183: 
                   5184: =pod
                   5185: 
                   5186: =head2 Resource/Nav Map Navigation
                   5187: 
                   5188: =over 4
                   5189: 
1.174     albertel 5190: =item * B<getNext>():
                   5191: 
                   5192: Retreive an array of the possible next resources after this
                   5193: one. Always returns an array, even in the one- or zero-element case.
                   5194: 
                   5195: =item * B<getPrevious>():
1.85      bowersj2 5196: 
1.174     albertel 5197: Retreive an array of the possible previous resources from this
                   5198: one. Always returns an array, even in the one- or zero-element case.
1.51      bowersj2 5199: 
                   5200: =cut
                   5201: 
                   5202: sub getNext {
                   5203:     my $self = shift;
                   5204:     my @branches;
                   5205:     my $to = $self->to();
1.85      bowersj2 5206:     foreach my $branch ( split(/,/, $to) ) {
1.51      bowersj2 5207:         my $choice = $self->{NAV_MAP}->getById($branch);
1.342     albertel 5208:         #if (!$choice->condition()) { next; }
1.51      bowersj2 5209:         my $next = $choice->goesto();
                   5210:         $next = $self->{NAV_MAP}->getById($next);
                   5211: 
1.131     bowersj2 5212:         push @branches, $next;
1.85      bowersj2 5213:     }
                   5214:     return \@branches;
                   5215: }
                   5216: 
                   5217: sub getPrevious {
                   5218:     my $self = shift;
                   5219:     my @branches;
                   5220:     my $from = $self->from();
                   5221:     foreach my $branch ( split /,/, $from) {
                   5222:         my $choice = $self->{NAV_MAP}->getById($branch);
                   5223:         my $prev = $choice->comesfrom();
                   5224:         $prev = $self->{NAV_MAP}->getById($prev);
                   5225: 
1.131     bowersj2 5226:         push @branches, $prev;
1.51      bowersj2 5227:     }
                   5228:     return \@branches;
1.131     bowersj2 5229: }
                   5230: 
                   5231: sub browsePriv {
                   5232:     my $self = shift;
                   5233:     if (defined($self->{BROWSE_PRIV})) {
                   5234:         return $self->{BROWSE_PRIV};
                   5235:     }
                   5236: 
1.311     albertel 5237:     $self->{BROWSE_PRIV} = &Apache::lonnet::allowed('bre',$self->src(),
                   5238: 						    $self->symb());
1.51      bowersj2 5239: }
                   5240: 
                   5241: =pod
1.2       www      5242: 
1.51      bowersj2 5243: =back
1.2       www      5244: 
1.51      bowersj2 5245: =cut
1.2       www      5246: 
1.51      bowersj2 5247: 1;
1.2       www      5248: 
1.51      bowersj2 5249: __END__
1.2       www      5250: 
                   5251: 

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