--- loncom/interface/lonsearchcat.pm 2001/03/15 18:52:17 1.21 +++ loncom/interface/lonsearchcat.pm 2002/06/24 16:45:22 1.128 @@ -1,129 +1,381 @@ -# The LearningOnline Network +# The LearningOnline Network with CAPA # Search Catalog # -# 03/08/2001 Scott Harrison +# $Id: lonsearchcat.pm,v 1.128 2002/06/24 16:45:22 harris41 Exp $ # +# Copyright Michigan State University Board of Trustees +# +# This file is part of the LearningOnline Network with CAPA (LON-CAPA). +# +# LON-CAPA is free software; you can redistribute it and/or modify +# it under the terms of the GNU General Public License as published by +# the Free Software Foundation; either version 2 of the License, or +# (at your option) any later version. +# +# LON-CAPA is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with LON-CAPA; if not, write to the Free Software +# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA +# +# /home/httpd/html/adm/gpl.txt +# +# http://www.lon-capa.org/ +# +# YEAR=2001 +# 3/8, 3/12, 3/13, 3/14, 3/15, 3/19 Scott Harrison +# 3/20, 3/21, 3/22, 3/26, 3/27, 4/2, 8/15, 8/24, 8/25 Scott Harrison +# 10/12,10/14,10/15,10/16,11/28,11/29,12/10,12/12,12/16 Scott Harrison +# YEAR=2002 +# 1/17 Scott Harrison +# 6/17 Matthew Hall +# +############################################################################### +############################################################################### + +=pod + +=head1 NAME + +lonsearchcat + +=head1 SYNOPSIS + +Search interface to LON-CAPAs digital library + +=head1 DESCRIPTION + +This module enables searching for a distributed browseable catalog. + +This is part of the LearningOnline Network with CAPA project +described at http://www.lon-capa.org. + +lonsearchcat presents the user with an interface to search the LON-CAPA +digital library. lonsearchcat also initiates the execution of a search +by sending the search parameters to LON-CAPA servers. The progress of +search (on a server basis) is displayed to the user in a seperate window. + +=head1 Internals + +=over 4 + +=cut + +############################################################################### +############################################################################### + +############################################################################### +## ## +## ORGANIZATION OF THIS PERL MODULE ## +## ## +## 1. Modules used by this module ## +## 2. Variables used throughout the module ## +## 3. handler subroutine called via Apache and mod_perl ## +## 4. Other subroutines ## +## ## +############################################################################### + package Apache::lonsearchcat; +# ------------------------------------------------- modules used by this module use strict; use Apache::Constants qw(:common); use Apache::lonnet(); use Apache::File(); use CGI qw(:standard); +use Text::Query; +use GDBM_File; +use Apache::loncommon(); + +# ---------------------------------------- variables used throughout the module + +###################################################################### +###################################################################### + +=pod + +=item Global variables + +=over 4 + +=item $closebutton + +button that closes the search window -my %language; -my $scrout; -my %metadatafields; -my %cprtag; -my %mimetag; +=item $importbutton +button to take the selecte results and go to group sorting + +=item %hash + +The ubiquitous database hash + +=item $diropendb + +The full path to the (temporary) search database file. This is set and +used in &handler() and is also used in &output_results(). + +=back + +=cut + +###################################################################### +###################################################################### + +# -- dynamically rendered interface components +my $closebutton; # button that closes the search window +my $importbutton; # button to take the selected results and go to group sorting + +# -- miscellaneous variables +my %hash; # database hash +my $diropendb = ""; # db file + +###################################################################### +###################################################################### + +=pod + +=item &handler() - main handler invoked by httpd child + +=item Variables + +=over 4 + +=item $hidden + +holds 'hidden' html forms + +=item $scrout + +string that holds portions of the screen output + +=back + +=cut + +###################################################################### +###################################################################### sub handler { my $r = shift; - -# -------------------------------------- see if called from an interactive mode - map { - my ($name, $value) = split(/=/,$_); - $value =~ tr/+/ /; - $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg; - if ($name eq 'catalogmode') { - $ENV{'form.'.$name}=$value; - } - } (split(/&/,$ENV{'QUERY_STRING'})); + untie %hash; $r->content_type('text/html'); $r->send_http_header; return OK if $r->header_only; - %metadatafields=(); - - my $hidden=''; - $hidden=< -END - -# ------------------------------------------------ First, check out environment - $metadatafields{'owner'}=$ENV{'user.name'}.'@'.$ENV{'user.domain'}; - -# --------------------------------- Compute various listings of metadata values - - %language=(); - $language{'any'}='Any language'; - { - my $fh=Apache::File->new($r->dir_config('lonTabDir').'/language.tab'); - map { - $_=~/(\w+)\s+([\w\s\-]+)/; - $language{$1}=$2; - } <$fh>; - } - - %cprtag=(); - $cprtag{'any'}='Any copyright/distribution'; - { - my $fh=Apache::File->new($r->dir_config('lonIncludes').'/copyright.tab'); - map { - $_=~/(\w+)\s+([\w\s\-]+)/; - $cprtag{$1}=$2; - } <$fh>; - } - - %mimetag=(); - $mimetag{'any'}='Any type'; - { - my $fh=Apache::File->new($r->dir_config('lonTabDir').'/filetypes.tab'); - map { - $_=~/(\w+)\s+(\w+)\s+([\w\s\-]+)/; - $mimetag{$1}=".$1 $3"; - } <$fh>; + my $domain = $r->dir_config('lonDefDomain'); + $diropendb= "/home/httpd/perl/tmp/".&Apache::lonnet::escape($domain). + "\_".&Apache::lonnet::escape($ENV{'user.name'})."_searchcat.db"; + + &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'}, + ['catalogmode','launch','acts','mode','form','element', + 'reqinterface']); + ## + ## Clear out old values from database + ## + if ($ENV{'form.launch'} eq '1') { + if (tie(%hash,'GDBM_File',$diropendb,&GDBM_WRCREAT,0640)) { + &start_fresh_session(); + untie %hash; + } else { + $r->print('Unable to tie hash to db '. + 'file'); + return OK; + } } - + ## + ## Produce some output, so people know it is working + ## + $r->print("\n"); + $r->rflush; + ## + ## Configure dynamic components of interface + ## + my $hidden; # Holds 'hidden' html forms + if ($ENV{'form.catalogmode'} eq 'interactive') { + $hidden="". + "\n"; + $closebutton=""."\n"; + } elsif ($ENV{'form.catalogmode'} eq 'groupsearch') { + $hidden=< +END + $closebutton=< +END + $importbutton=< +END + } + $hidden .= < + + + +END + ## + ## What are we doing? + ## if ($ENV{'form.basicsubmit'} eq 'SEARCH') { - return &basicsearch($r,\%ENV); + # Perform basic search and give results + return &basicsearch($r,\%ENV,$hidden); + } elsif ($ENV{'form.advancedsubmit'} eq 'SEARCH') { + # Perform advanced search and give results + return &advancedsearch($r,\%ENV,$hidden); + } elsif ($ENV{'form.reqinterface'} eq 'advanced') { + # Output the advanced interface + $r->print(&advanced_search_form($closebutton,$hidden)); + return OK; + } else { + # Output normal search interface + $r->print(&basic_search_form($closebutton,$hidden)); } - elsif ($ENV{'form.advancedsubmit'} eq 'SEARCH') { - return &advancedsearch($r,\%ENV); + return OK; +} + +###################################################################### +###################################################################### + +=pod + +=item &basic_search_form() + +Returns a scalar which holds html for the basic search form. + +=cut + +###################################################################### +###################################################################### + +sub basic_search_form{ + my ($closebutton,$hidden) = @_; + my $scrout=<<"ENDDOCUMENT"; + + +The LearningOnline Network with CAPA + + + + +

Search Catalog

+
+$hidden +

Basic Search

+

+Enter terms or phrases separated by AND, OR, or NOT then press SEARCH below. +

+

+ +
+ENDDOCUMENT + $scrout.=' '.&simpletextfield('basicexp',$ENV{'form.basicexp'},40). + ' '; +# $scrout.=&simplecheckbox('allversions',$ENV{'form.allversions'}); +# $scrout.='Search historic archives'; + $scrout.=<Advanced Search
+

+

+   +$closebutton + + + + +

+
+ + +ENDDOCUMENT + return $scrout; +} +###################################################################### +###################################################################### + +=pod + +=item &advanced_search_form() - $scrout=''; # building a part of screen output +Returns a scalar which holds html for the advanced search form. + +=cut + +###################################################################### +###################################################################### + +sub advanced_search_form{ + my ($closebutton,$hidden) = @_; + my $scrout=<<"ENDHEADER"; + + +The LearningOnline Network with CAPA + + + + +

Search Catalog

+
+$hidden +
+

Advanced Search

+ENDHEADER $scrout.=&searchphrasefield('Limit by title','title', $ENV{'form.title'}); - $scrout.=&searchphrasefield('Limit by author','author', $ENV{'form.author'}); - $scrout.=&searchphrasefield('Limit by subject','subject', $ENV{'form.subject'}); - $scrout.=&searchphrasefield('Limit by keywords','keywords', $ENV{'form.keywords'}); - $scrout.=&searchphrasefield('Limit by URL','url', $ENV{'form.url'}); - - $scrout.=&searchphrasefield('Limit by version','version', - $ENV{'form.version'}); - +# $scrout.=&searchphrasefield('Limit by version','version', +# $ENV{'form.version'}); $scrout.=&searchphrasefield('Limit by notes','notes', $ENV{'form.notes'}); - $scrout.=&searchphrasefield('Limit by abstract','abstract', $ENV{'form.abstract'}); - - $ENV{'form.mime'}='notxxx' unless length($ENV{'form.mime'}); + $ENV{'form.mime'}='any' unless length($ENV{'form.mime'}); $scrout.=&selectbox('Limit by MIME type','mime', - $ENV{'form.mime'},%mimetag); - + $ENV{'form.mime'}, + 'any','Any type', + \&{Apache::loncommon::filedescriptionex}, + (&Apache::loncommon::fileextensions)); $ENV{'form.language'}='any' unless length($ENV{'form.language'}); - $scrout.=&selectbox('Limit by language','language', - $ENV{'form.language'},%language); - - + $ENV{'form.language'},'any','Any Language', + \&{Apache::loncommon::languagedescription}, + (&Apache::loncommon::languageids), + ); # ------------------------------------------------ Compute date selection boxes $scrout.=< LIMIT BY CREATION DATE RANGE: -
+
between: CREATIONDATESTART $scrout.=&dateboxes('creationdatestart',1,1,1976, @@ -131,21 +383,18 @@ CREATIONDATESTART $ENV{'form.creationdatestart_day'}, $ENV{'form.creationdatestart_year'}, ); - $scrout.=< LIMIT BY LAST REVISION DATE RANGE: -
between: +
between: LASTREVISIONDATESTART $scrout.=&dateboxes('lastrevisiondatestart',1,1,1976, $ENV{'form.lastrevisiondatestart_month'}, @@ -161,374 +410,986 @@ LASTREVISIONDATEEND $ENV{'form.lastrevisiondateend_year'}, ); $scrout.='

'; - $scrout.=&searchphrasefield('Limit by publisher/owner','owner', $ENV{'form.owner'}); -# $metadatafields{'owner'}); - $ENV{'form.copyright'}='any' unless length($ENV{'form.copyright'}); $scrout.=&selectbox('Limit by copyright/distribution','copyright', - $ENV{'form.copyright'},%cprtag); - + $ENV{'form.copyright'}, + 'any','Any copyright/distribution', + \&{Apache::loncommon::copyrightdescription}, + (&Apache::loncommon::copyrightids), + ); # ------------------------------------------- Compute customized metadata field $scrout.=< -LIMIT BY OTHER METADATA FIELDS: +LIMIT BY SPECIAL METADATA FIELDS: -For author-specific metadata, enter in an expression in the form of -key=value separated by operators such as AND or OR.
+For resource-specific metadata, enter in an expression in the form of +key=value separated by operators such as AND, OR or NOT.
Example: grandmother=75 OR grandfather=85 -
+
CUSTOMMETADATA -$scrout.=&simpletextfield('custommetadata',$ENV{'form.custommetadata'}); -$scrout.=' initial users of this system do not need to worry about this option'; - -# ---------------------------------------------------------------- Print screen - $r->print(< - -The LearningOnline Network with CAPA - - - -

Search Catalog

- -$hidden -
-

Basic Search

+ $scrout.=&simpletextfield('custommetadata',$ENV{'form.custommetadata'}); + $scrout.=< -Enter terms or phrases separated by search operators -such as AND or OR then press SEARCH below. Terms should be specific -to the title, author, subject, notes, or abstract information associated -with a resource. -
-ENDDOCUMENT - $r->print(&simpletextfield('basicexp',$ENV{'form.basicexp'})); - $r->print(' '); - $r->print(&simplecheckbox('titleonly',$ENV{'form.titleonly'})); - $r->print('Title only '); - $r->print(&simplecheckbox('allversions',$ENV{'form.allversions'})); - $r->print(<Search historic archives -
- - - -

-
-

Advanced Search

-$scrout +SHOW SPECIAL METADATA FIELDS: + +Enter in a space-separated list of special metadata fields to show +in a fielded listing for each record result. +
+CUSTOMSHOW + $scrout.=&simpletextfield('customshow',$ENV{'form.customshow'}); + $scrout.=< - - - + + +$closebutton + + + +

ENDDOCUMENT - return OK; -} + return $scrout; +} -# --------------------------------------------------------- Various form fields +###################################################################### +###################################################################### -sub textfield { - my ($title,$name,$value)=@_; - return "\n

$title:
". - ''; +=pod + +=item &make_persistent() + +Returns a scalar which holds the current ENV{'form.*'} values in +a 'hidden' html input tag. This allows search interface information +to be somewhat persistent. + +=cut + +###################################################################### +###################################################################### + +sub make_persistent { + my $persistent=''; + foreach (keys %ENV) { + if (/^form\./ && !/submit/) { + my $name=$_; + my $key=$name; + $ENV{$key}=~s/\'//g; # do not mess with html field syntax + $name=~s/^form\.//; + $persistent.=< +END + } + } + return $persistent; } + +###################################################################### +###################################################################### + +=pod + +=item HTML form building functions + +=over 4 + +=item &simpletextfield() + +Inputs: $name,$value,$size + +Returns a text input field with the given name, value, and size. +If size is not specified, a value of 20 is used. + +=item &simplecheckbox() + +Inputs: $name,$value + +Returns a simple check box with the given $name. +If $value eq 'on' the box is checked. + +=item &searchphrasefield() + +Inputs: $title,$name,$value + +Returns html for a title line and an input field for entering search terms. +the instructions "Enter terms or phrases separated by search operators such +as AND, OR, or NOT." are given following the title. The entry field (which +is where the $name and $value are used) is an 80 column simpletextfield. + +=item &dateboxes() + +Returns html selection form elements for the specification of +the day, month, and year. + +=item &selectbox() + +Returns html selection form. + +=back + +=cut + +###################################################################### +###################################################################### + sub simpletextfield { - my ($name,$value)=@_; - return ''; + my ($name,$value,$size)=@_; + $size = 20 if (! defined($size)); + return ''; } sub simplecheckbox { my ($name,$value)=@_; my $checked=''; $checked="CHECKED" if $value eq 'on'; - return ''; + return ''; } sub searchphrasefield { my ($title,$name,$value)=@_; my $instruction=<$uctitle:". - " $instruction
". - ''; + return "\n". + '

'.$uctitle.':'. + " $instruction
".&simpletextfield($name,$value,80); } sub dateboxes { my ($name,$defaultmonth,$defaultday,$defaultyear, $currentmonth,$currentday,$currentyear)=@_; ($defaultmonth,$defaultday,$defaultyear)=('','',''); - my $month=< - - - - - - - - - - - - - - -END - $month=~s/(\"$currentmonth\")/$1 SELECTED/ if length($currentmonth); + # + # Day my $day=< - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - END + for (my $i = 1; $i<=31; $i++) { + $day.="\n"; + } + $day.="\n"; $day=~s/(\"$currentday\")/$1 SELECTED/ if length($currentday); + # + # Month + my $month=< + +END + my $i = 1; + foreach (qw/January February March April May June + July August September October November December /){ + $month .="\n"; + $i++; + } + $month.="\n"; + $month=~s/(\"$currentmonth\")/$1 SELECTED/ if length($currentmonth); + # + # Year (obviously) my $year=< - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - END + my $maxyear = 2051; + for (my $i = 1976; $i<=$maxyear; $i++) { + $year.="\n"; + } + $year.="\n"; $year=~s/(\"$currentyear\")/$1 SELECTED/ if length($currentyear); return "$month$day$year"; } sub selectbox { - my ($title,$name,$value,%options)=@_; + my ($title,$name,$value,$anyvalue,$anytag,$functionref,@idlist)=@_; my $uctitle=uc($title); - my $selout="\n

$uctitle:". - "
".''; + foreach ($anyvalue,@idlist) { $selout.=''; + } + elsif ($_ eq $value and /^$anyvalue$/) { + $selout.=' selected >'.$anytag.''; + } + else {$selout.='>'.&{$functionref}($_).'';} + } return $selout.''; } -# ------------------------------------------------ Performing a advanced search +###################################################################### +###################################################################### + +=pod + +=item &advancedsearch() + +Parse advanced search results. + +=cut + +###################################################################### +###################################################################### sub advancedsearch { - my ($r,$envhash)=@_; + my ($r,$envhash,$hidden)=@_; my %ENV=%{$envhash}; - + my $fillflag=0; + # Clean up fields for safety + for my $field ('title','author','subject','keywords','url','version', + 'creationdatestart_month','creationdatestart_day', + 'creationdatestart_year','creationdateend_month', + 'creationdateend_day','creationdateend_year', + 'lastrevisiondatestart_month','lastrevisiondatestart_day', + 'lastrevisiondatestart_year','lastrevisiondateend_month', + 'lastrevisiondateend_day','lastrevisiondateend_year', + 'notes','abstract','mime','language','owner', + 'custommetadata','customshow') { + $ENV{"form.$field"}=~s/[^\w\/\s\(\)\=\-\"\']//g; + } + foreach ('mode','form','element') { + # is this required? Hmmm. + next unless (exists($ENV{"form.$_"})); + $ENV{"form.$_"}=&Apache::lonnet::unescape($ENV{"form.$_"}); + $ENV{"form.$_"}=~s/[^\w\/\s\(\)\=\-\"\']//g; + } + # Check to see if enough information was filled in + for my $field ('title','author','subject','keywords','url','version', + 'notes','abstract','mime','language','owner', + 'custommetadata') { + if (&filled($ENV{"form.$field"})) { + $fillflag++; + } + } + unless ($fillflag) { + &output_blank_field_error($r); + return OK; + } + # Turn the form input into a SQL-based query + my $query=''; + my @queries; + # Evaluate logical expression AND/OR/NOT phrase fields. + foreach my $field ('title','author','subject','notes','abstract','url', + 'keywords','version','owner') { + if ($ENV{'form.'.$field}) { + push @queries,&build_SQL_query($field,$ENV{'form.'.$field}); + } + } + # Evaluate option lists + if ($ENV{'form.language'} and $ENV{'form.language'} ne 'any') { + push @queries,"(language like \"$ENV{'form.language'}\")"; + } + if ($ENV{'form.mime'} and $ENV{'form.mime'} ne 'any') { + push @queries,"(mime like \"$ENV{'form.mime'}\")"; + } + if ($ENV{'form.copyright'} and $ENV{'form.copyright'} ne 'any') { + push @queries,"(copyright like \"$ENV{'form.copyright'}\")"; + } + # Evaluate date windows + my $datequery=&build_date_queries( + $ENV{'form.creationdatestart_month'}, + $ENV{'form.creationdatestart_day'}, + $ENV{'form.creationdatestart_year'}, + $ENV{'form.creationdateend_month'}, + $ENV{'form.creationdateend_day'}, + $ENV{'form.creationdateend_year'}, + $ENV{'form.lastrevisiondatestart_month'}, + $ENV{'form.lastrevisiondatestart_day'}, + $ENV{'form.lastrevisiondatestart_year'}, + $ENV{'form.lastrevisiondateend_month'}, + $ENV{'form.lastrevisiondateend_day'}, + $ENV{'form.lastrevisiondateend_year'}, + ); + # Test to see if date windows are legitimate + if ($datequery=~/^Incorrect/) { + &output_date_error($r,$datequery); + return OK; + } + elsif ($datequery) { + push @queries,$datequery; + } + # Process form information for custom metadata querying + my $customquery=''; + if ($ENV{'form.custommetadata'}) { + $customquery=&build_custommetadata_query('custommetadata', + $ENV{'form.custommetadata'}); + } + my $customshow=''; + if ($ENV{'form.customshow'}) { + $customshow=$ENV{'form.customshow'}; + $customshow=~s/[^\w\s]//g; + my @fields=split(/\s+/,$customshow); + $customshow=join(" ",@fields); + } + # Send query statements over the network to be processed by either the SQL + # database or a recursive scheme of 'grep'-like actions (for custom + # metadata). + if (@queries) { + $query=join(" AND ",@queries); + $query="select * from metadata where $query"; + my $reply; # reply hash reference + unless ($customquery or $customshow) { + $reply=&Apache::lonnet::metadata_query($query); + } + else { + $reply=&Apache::lonnet::metadata_query($query, + $customquery,$customshow); + } + &output_results('Advanced',$r,$envhash,$customquery,$reply,$hidden); + return OK; + } elsif ($customquery) { + my $reply; # reply hash reference + $reply=&Apache::lonnet::metadata_query('', + $customquery,$customshow); + &output_results('Advanced',$r,$envhash,$customquery,$reply,$hidden); + return OK; + } + # should not get to this point + return 'Error. Should not have gone to this point.'; } -# --------------------------------------------------- Performing a basic search +###################################################################### +###################################################################### + +=pod + +=item &basicsearch() + +Parse basic search form. + +=cut + +###################################################################### +###################################################################### sub basicsearch { - my ($r,$envhash)=@_; + my ($r,$envhash,$hidden)=@_; my %ENV=%{$envhash}; + # Clean up fields for safety + for my $field ('basicexp') { + $ENV{"form.$field"}=~s/[^\w\s\(\)\-]//g; + } + foreach ('mode','form','element') { + # is this required? Hmmm. + next unless (exists($ENV{"form.$_"})); + $ENV{"form.$_"}=&Apache::lonnet::unescape($ENV{"form.$_"}); + $ENV{"form.$_"}=~s/[^\w\/\s\(\)\=\-\"\']//g; + } + + # Check to see if enough is filled in + unless (&filled($ENV{'form.basicexp'})) { + &output_blank_field_error($r); + return OK; + } + + # Build SQL query string based on form page + my $query=''; + my $concatarg=join('," ",', + ('title', 'author', 'subject', 'notes', 'abstract', + 'keywords')); + $concatarg='title' if $ENV{'form.titleonly'}; + + $query=&build_SQL_query('concat('.$concatarg.')',$ENV{'form.'.'basicexp'}); + + # Get reply (either a hash reference to filehandles or bad connection) +# &Apache::lonnet::logthis("metadata query started:".time); + my $reply=&Apache::lonnet::metadata_query('select * from metadata where '.$query); +# &Apache::lonnet::logthis("metadata query finished:".time); + # Output search results + + &output_results('Basic',$r,$envhash,$query,$reply,$hidden); - my $query=$ENV{'form.basicexp'}; - $query="select * from metadata where concat(title,\" \",author) like '\%$ENV{'form.basicexp'}\%'"; - my $reply=&Apache::lonnet::metadata_query($query); - &output_results($r,$envhash,$reply); return OK; } -# ----------------------------- format and output results based on a reply list + +###################################################################### +###################################################################### + +=pod + +=item &build_SQL_query() + +Builds a SQL query string from a logical expression with AND/OR keywords +using Text::Query and &recursive_SQL_query_builder() + +=cut + +###################################################################### +###################################################################### +sub build_SQL_query { + my ($field_name,$logic_statement)=@_; + my $q=new Text::Query('abc', + -parse => 'Text::Query::ParseAdvanced', + -build => 'Text::Query::Build'); + $q->prepare($logic_statement); + my $matchexp=${$q}{'matchexp'}; chomp $matchexp; + my $sql_query=&recursive_SQL_query_build($field_name,$matchexp); + return $sql_query; +} + +###################################################################### +###################################################################### + +=pod + +=item &build_custommetadata_query() + +Constructs a custom metadata query using a rather heinous regular +expression. + +=cut + +###################################################################### +###################################################################### +sub build_custommetadata_query { + my ($field_name,$logic_statement)=@_; + my $q=new Text::Query('abc', + -parse => 'Text::Query::ParseAdvanced', + -build => 'Text::Query::BuildAdvancedString'); + $q->prepare($logic_statement); + my $matchexp=${$q}{'-parse'}{'-build'}{'matchstring'}; + # quick fix to change literal into xml tag-matching + # will eventually have to write a separate builder module + # wordone=wordtwo becomes\[^\<] *wordtwo[^\<]*\<\/wordone\> + $matchexp =~ s/(\w+)\\=([\w\\\+]+)?# wordone=wordtwo is changed to + /\\<$1\\>?# \ + \[\^\\<\]?# [^\<] + \*$2\[\^\\<\]?# *wordtwo[^\<] + \*\\<\\\/$1\\>?# *\<\/wordone\> + /g; + return $matchexp; +} + +###################################################################### +###################################################################### + +=pod + +=item &recursive_SQL_query_build() + +Recursively constructs an SQL query. Takes as input $dkey and $pattern. + +=cut + +###################################################################### +###################################################################### +sub recursive_SQL_query_build { + my ($dkey,$pattern)=@_; + my @matches=($pattern=~/(\[[^\]|\[]*\])/g); + return $pattern unless @matches; + foreach my $match (@matches) { + $match=~/\[ (\w+)\s(.*) \]/; + my ($key,$value)=($1,$2); + my $replacement=''; + if ($key eq 'literal') { + $replacement="($dkey like \"\%$value\%\")"; + } + elsif ($key eq 'not') { + $value=~s/like/not like/; +# $replacement="($dkey not like $value)"; + $replacement="$value"; + } + elsif ($key eq 'and') { + $value=~/(.*[\"|\)]) ([|\(|\^].*)/; + $replacement="($1 AND $2)"; + } + elsif ($key eq 'or') { + $value=~/(.*[\"|\)]) ([|\(|\^].*)/; + $replacement="($1 OR $2)"; + } + substr($pattern, + index($pattern,$match), + length($match), + $replacement + ); + } + &recursive_SQL_query_build($dkey,$pattern); +} + +###################################################################### +###################################################################### + +=pod + +=item &build_date_queries() + +Builds a SQL logic query to check time/date entries. +Also reports errors (check for /^Incorrect/). + +=cut + +###################################################################### +###################################################################### +sub build_date_queries { + my ($cmonth1,$cday1,$cyear1,$cmonth2,$cday2,$cyear2, + $lmonth1,$lday1,$lyear1,$lmonth2,$lday2,$lyear2)=@_; + my @queries; + if ($cmonth1 or $cday1 or $cyear1 or $cmonth2 or $cday2 or $cyear2) { + unless ($cmonth1 and $cday1 and $cyear1 and + $cmonth2 and $cday2 and $cyear2) { + return "Incorrect entry for the creation date. You must specify ". + "a starting month, day, and year and an ending month, ". + "day, and year."; + } + my $cnumeric1=sprintf("%d%2d%2d",$cyear1,$cmonth1,$cday1); + $cnumeric1+=0; + my $cnumeric2=sprintf("%d%2d%2d",$cyear2,$cmonth2,$cday2); + $cnumeric2+=0; + if ($cnumeric1>$cnumeric2) { + return "Incorrect entry for the creation date. The starting ". + "date must occur before the ending date."; + } + my $cquery="(creationdate BETWEEN '$cyear1-$cmonth1-$cday1' AND '". + "$cyear2-$cmonth2-$cday2 23:59:59')"; + push @queries,$cquery; + } + if ($lmonth1 or $lday1 or $lyear1 or $lmonth2 or $lday2 or $lyear2) { + unless ($lmonth1 and $lday1 and $lyear1 and + $lmonth2 and $lday2 and $lyear2) { + return "Incorrect entry for the last revision date. You must ". + "specify a starting month, day, and year and an ending ". + "month, day, and year."; + } + my $lnumeric1=sprintf("%d%2d%2d",$lyear1,$lmonth1,$lday1); + $lnumeric1+=0; + my $lnumeric2=sprintf("%d%2d%2d",$lyear2,$lmonth2,$lday2); + $lnumeric2+=0; + if ($lnumeric1>$lnumeric2) { + return "Incorrect entry for the last revision date. The ". + "starting date must occur before the ending date."; + } + my $lquery="(lastrevisiondate BETWEEN '$lyear1-$lmonth1-$lday1' AND '". + "$lyear2-$lmonth2-$lday2 23:59:59')"; + push @queries,$lquery; + } + if (@queries) { + return join(" AND ",@queries); + } + return ''; +} + +###################################################################### +###################################################################### + +=pod + +=item &output_results() + +Format and output results based on a reply list. +There are two windows that this function writes to. The main search +window ("srch") has a listing of the results. A secondary window ("popwin") +gives the status of the network search (time elapsed, number of machines +contacted, etc.) + +=cut + +###################################################################### +###################################################################### sub output_results { - my ($r,$envhash,@replylist)=@_; +# &Apache::lonnet::logthis("output_results:".time); + my $fnum; # search result counter + my ($mode,$r,$envhash,$query,$replyref,$hidden)=@_; my %ENV=%{$envhash}; - foreach my $reply (@replylist) { - + my %rhash=%{$replyref}; + my $compiledresult=''; + my $timeremain=300; # (seconds) + my $elapsetime=0; + my $resultflag=0; + my $tflag=1; + # + # make query information persistent to allow for subsequent revision + my $persistent=&make_persistent(); + # spit out the generic header + $r->print(&search_results_header()); + $r->rflush(); + # begin showing the cataloged results + $r->print(< + + +

Search Catalog

+CATALOGBEGIN + $r->print(< +$hidden + + +$importbutton +$closebutton +$persistent +
+

Search Query

+CATALOGCONTROLS + # + # Remind them what they searched for + # + if ($mode eq 'Basic') { + $r->print('

Basic search: '.$ENV{'form.basicexp'}.'

'); + } elsif ($mode eq 'Advanced') { + $r->print('

Advanced search '.$query.'

'); + } + $r->print('

Search Results

'); + $r->rflush(); + # + # make the pop-up window for status + # + $r->print(&make_popwin(%rhash)); + $r->rflush(); + ## + ## Prepare for the main loop below + ## + my $servercount=0; + my $hitcountsum=0; + my $servernum=(keys %rhash); + my $serversleft=$servernum; + ## + ## Run until we run out of time or we run out of servers + ## + while($serversleft && $timeremain) { + ## + ## %rhash has servers deleted from it as results come in + ## (within the foreach loop below). + ## + foreach my $rkey (sort keys %rhash) { +# &Apache::lonnet::logthis("Server $rkey:".time); + $servercount++; + $compiledresult=''; + my $reply=$rhash{$rkey}; my @results; - - my $replyfile=''; - $reply=~/^([\.\w]+)$/; # must do since 'use strict' checks for tainting - $replyfile=$r->dir_config('lonDaemons').'/tmp/'.$1; - $reply=~/(.*?)\_/; - my $hostname=$1; - - { - while (1) { - last if -e $replyfile; - sleep 1; + if ($reply eq 'con_lost') { + &popwin_imgupdate($r,$rkey,"srvbad.gif"); + $serversleft--; + delete $rhash{$rkey}; + } else { + # must do since 'use strict' checks for tainting + $reply=~/^([\.\w]+)$/; + my $replyfile=$r->dir_config('lonDaemons').'/tmp/'.$1; + $reply=~/(.*?)\_/; + for (my $counter=0;$counter<2;$counter++) { + if (-e $replyfile && ! -e "$replyfile.end") { + &popwin_imgupdate($r,$rkey,"srvhalf.gif"); + &popwin_js($r,'popwin.hc["'.$rkey.'"]='. + '"still transferring..."'.';'); + } + # Are we finished transferring data? + if (-e "$replyfile.end") { + $serversleft--; + delete $rhash{$rkey}; + if (-s $replyfile) { + &popwin_imgupdate($r,$rkey,"srvgood.gif"); + my $fh; + unless ($fh=Apache::File->new($replyfile)){ + # Is it really appropriate to die on this error? + $r->print('ERROR: file '. + $replyfile.' cannot be opened'); + return OK; + } + @results=<$fh> if $fh; + my $hits =@results; + &popwin_js($r,'popwin.hc["'.$rkey.'"]='. + $hits.';'); + $hitcountsum+=$hits; + &popwin_js($r,'popwin.document.forms.popremain.'. + 'numhits.value='.$hitcountsum.';'); + } else { + &popwin_imgupdate($r,$rkey,"srvempty.gif"); + &popwin_js($r,'popwin.hc["'.$rkey.'"]=0;'); + } + last; + } # end of if ( -e "$replyfile.end") + last unless $timeremain; + sleep 1; # wait for daemons to write files? + $timeremain--; + $elapsetime++; + &popwin_js($r,"popwin.document.popremain.". + "elapsetime.value=$elapsetime;"); } - # QUESTION: how should I handle this error condition.. - # I'm sure there is syntax elsewhere I can use.. - my $fh=Apache::File->new($replyfile) or - ($r->print('file cannot be opened') and return OK); - @results=<$fh>; - } - - my $compiledresult=''; - - foreach my $result (@results) { - my ($title,$author,$subject,$url,$keywords,$version, - $notes,$abstract,$mime,$lang, - $creationdate,$lastrevisiondate,$owner,$copyright - )=map {&Apache::lonnet::unescape($_)} (split(/\,/,$result)); - my $shortabstract=$abstract; - $shortabstract=substr($abstract,0,200) if length($abstract)>200; - $compiledresult.=< -END - $compiledresult.=<print('Unable to tie hash to db '. + 'file'); + } else { + if ($ENV{'form.launch'} eq '1') { + &start_fresh_session(); + } + foreach my $result (@results) { + next if $result=~/^custom\=/; + chomp $result; + next unless $result; + %Fields = &parse_raw_result($result,$rkey); + $Fields{'extrashow'}=$extrashow; + if ($extrashow) { + foreach my $field (@customfields) { + my $value=''; + $value = $1 if ($customhash{$Fields{'url'}}=~/\<{$field}[^\>]*\>(.*?)\<\/{$field}[^\>]*\>/s); + $Fields{'extrashow'}=~s/\<\!\-\- $field \-\-\>/ $value/g; + } + } + if ($compiledresult or $servercount!=$servernum) { + $compiledresult.="
"; + } + $compiledresult.="\n

\n"; + if ($ENV{'form.catalogmode'} eq 'interactive') { + my $titleesc=$Fields{'title'}; + $titleesc=~s/\'/\\'/; # ' + $compiledresult.=< +onClick="javascript:select_data('$titleesc','$Fields{'url'}')"> -
+
END - $compiledresult.=<URL: $url -
-Title: $title
-Author(s): $author
-Subject: $subject
-Keyword(s): $keywords
-Notes: $notes
-Abstract: $shortabstract
-MIME Type: $mimetag{$mime}
-Language: $language{$lang}
-Creation Date: $creationdate
-Last Revision Date: $lastrevisiondate
-Publisher/Owner: $owner
-Copyright/Distribution: $copyright
-Repository Location: $hostname -

+ } + if ($ENV{'form.catalogmode'} eq 'groupsearch') { + $fnum+=0; + $hash{"pre_${fnum}_link"}=$Fields{'url'}; + $hash{"pre_${fnum}_title"}=$Fields{'title'}; + $compiledresult.=< + + +
END +# +# + $fnum++; + } + my $viewselect; + if ($mode eq 'Basic') { + $viewselect=$ENV{'form.basicviewselect'}; + } + elsif ($mode eq 'Advanced') { + $viewselect=$ENV{'form.advancedviewselect'}; + } + if ($viewselect eq 'Detailed Citation View') { + $compiledresult.=&detailed_citation_view + (%Fields, hostname => $rkey ); + } + elsif ($viewselect eq 'Summary View') { + $compiledresult.=&summary_view + (%Fields, hostname => $rkey ); + } + elsif ($viewselect eq 'Fielded Format') { + $compiledresult.=&fielded_format_view + (%Fields, hostname => $rkey ); + } + elsif ($viewselect eq 'XML/SGML') { + $compiledresult.=&xml_sgml_view + (%Fields, hostname => $rkey ); + } + } + untie %hash; } - - unless ($compiledresult) { - $compiledresult="There were no results that matched your query"; + if ($compiledresult) { + $resultflag=1; + $r->print($compiledresult); } + my $percent=sprintf('%3.0f',($servercount/$servernum*100)); + } # End of foreach loop over servers remaining + } # End of big loop - while($serversleft && $timeremain) + unless ($resultflag) { + $r->print("\nThere were no results that matched your query\n"); + } +# $r->print(''."\n"); $r->rflush(); + $r->print("\n\n"); + return; +} - # make query information persistent to allow for subsequent revision - my $persistent=''; - map { - if (/^form\./ && !/submit/) { - my $name=$_; - my $key=$name; - $name=~s/^form\.//; - $persistent.=< -END - } - } (keys %ENV); +########################################################### +########################################################### + +=pod + +=item &parse_raw_result() + +Takes a line from the file of results and parse it. Returns a hash +with keys for the following fields: +'title', 'author', 'subject', 'url', 'keywords', 'version', 'notes', +'abstract', 'mime', 'lang', 'owner', 'copyright', 'creationdate', +'lastrevisiondate'. + +In addition, the following tags are set by calling the appropriate +lonnet function: 'language', 'cprtag', 'mimetag'. + +The 'title' field is set to "Untitled" if the title field is blank. + +'abstract' and 'keywords' are truncated to 200 characters. + +=cut + +########################################################### +########################################################### +sub parse_raw_result { + my ($result,$hostname) = @_; + # Check for a comma - if it is there then we do not need to unescape the + # string. There seems to be some kind of problem with some items in + # the database - the entire string gets sent out unescaped...? + unless ($result =~ /,/) { + $result = &Apache::lonnet::unescape($result); + } + my @fields=map { + &Apache::lonnet::unescape($_); + } (split(/\,/,$result)); + my ($title,$author,$subject,$url,$keywords,$version, + $notes,$abstract,$mime,$lang, + $creationdate,$lastrevisiondate,$owner,$copyright)=@fields; + my %Fields = + ( title => &Apache::lonnet::unescape($title), + author => &Apache::lonnet::unescape($author), + subject => &Apache::lonnet::unescape($subject), + url => &Apache::lonnet::unescape($url), + keywords => &Apache::lonnet::unescape($keywords), + version => &Apache::lonnet::unescape($version), + notes => &Apache::lonnet::unescape($notes), + abstract => &Apache::lonnet::unescape($abstract), + mime => &Apache::lonnet::unescape($mime), + lang => &Apache::lonnet::unescape($lang), + owner => &Apache::lonnet::unescape($owner), + copyright => &Apache::lonnet::unescape($copyright), + creationdate => &Apache::lonnet::unescape($creationdate), + lastrevisiondate => &Apache::lonnet::unescape($lastrevisiondate) + ); + $Fields{'language'} = + &Apache::loncommon::languagedescription($Fields{'lang'}); + $Fields{'copyrighttag'} = + &Apache::loncommon::copyrightdescription($Fields{'copyright'}); + $Fields{'mimetag'} = + &Apache::loncommon::filedescription($Fields{'mime'}); + # Put spaces in the keyword list, if needed. + $Fields{'keywords'}=~ s/,([A-z])/, $1/g; + if ($Fields{'title'}=~ /^\s*$/ ) { + $Fields{'title'}='Untitled'; + } + unless ($ENV{'user.adv'}) { + $Fields{'keywords'} = '- not displayed -'; + $Fields{'notes'} = '- not displayed -'; + $Fields{'abstract'} = '- not displayed -'; + $Fields{'subject'} = '- not displayed -'; + } + if (length($Fields{'abstract'})>200) { + $Fields{'abstract'} = + substr($Fields{'abstract'},0,200).'...'; + } + if (length($Fields{'keywords'})>200) { + $Fields{'keywords'} = + substr($Fields{'keywords'},0,200).'...'; + } + return %Fields; +} + +########################################################### +########################################################### + +=pod + +=item &handle_custom_fields() + +=cut + +########################################################### +########################################################### +sub handle_custom_fields { + my @results = @{shift()}; + my $customshow=''; + my $extrashow=''; + my @customfields; + if ($ENV{'form.customshow'}) { + $customshow=$ENV{'form.customshow'}; + $customshow=~s/[^\w\s]//g; + my @fields=map { + "$_:"; + } split(/\s+/,$customshow); + @customfields=split(/\s+/,$customshow); + if ($customshow) { + $extrashow="
  • ".join("
  • ",@fields)."
\n"; + } + } + my $customdata=''; + my %customhash; + foreach my $result (@results) { + if ($result=~/^(custom\=.*)$/) { # grab all custom metadata + my $tmp=$result; + $tmp=~s/^custom\=//; + my ($k,$v)=map {&Apache::lonnet::unescape($_); + } split(/\,/,$tmp); + $customhash{$k}=$v; + } + } + return ($extrashow,\@customfields,\%customhash); +} + +###################################################################### +###################################################################### + +=pod + +=item &search_results_header + +Output the proper javascript code to deal with different calling modes. + +Takes inputs directly from from %ENV. The following environment variables +are checked: - $r->print(< The LearningOnline Network with CAPA BEGINNING - $r->print(< + # conditional output of script functions dependent on the mode in + # which the search was invoked + if ($ENV{'form.catalogmode'} eq 'interactive'){ + if (! exists($ENV{'form.mode'}) || $ENV{'form.mode'} ne 'edit') { + $result.=< function select_data(title,url) { changeTitle(title); changeURL(url); + self.close(); } function changeTitle(val) { if (opener.inf.document.forms.resinfo.elements.t) { @@ -542,29 +1403,512 @@ BEGINNING } SCRIPT - $r->print(< +function select_data(title,url) { + changeURL(url); + self.close(); +} +function changeTitle(val) { +} +function changeURL(val) { + if (window.opener.document) { + window.opener.document.forms["$form"].elements["$element"].value=val; + } else { + var url = 'forms[\"$form\"].elements[\"$element\"].value'; + alert("Unable to transfer data to "+url); + } +} + +SCRIPT + } + } + $result.=< +SCRIPT + $result.=< + function displayinfo(val) { + popwin.document.forms.popremain.sdetails.value=val; + } + function openhelp(val) { + openhelpwin=open('/adm/help/searchcat.html','helpscreen', + 'scrollbars=1,width=400,height=300'); + openhelpwin.focus(); + } + function abortsearch(val) { + popwin.close(); + } + +SCRIPT + return $result; +} + +###################################################################### +###################################################################### + +=pod + +=item &make_popwin() + +Returns html with javascript in it to open up the status window. + +=cut + +###################################################################### +###################################################################### +sub make_popwin { + my %rhash = @_; + my $servernum=(keys %rhash); + my $hcinit; + my $grid="'
'+\n"; + # $sn is the server number, used ONLY to make sure we have + # rows of 10 each. No longer used to index images. + my $sn=1; + foreach my $sk (sort keys %rhash) { + # ''+ + $grid.="'+\"'\"+')\">'+"; + $grid.="\n"; + $grid.="'\"".$sk.'+\n"; + $grid.="'
'+\n" unless $sn%10; + $sn++; + } + my $result.=< + popwin=open('','popwin','scrollbars=1,width=400,height=220'); + popwin.focus(); + popwin.document.writeln('<'+'html>'); + popwin.document.writeln('<'+'head>'); + popwin.document.writeln('<'+'script>'); + popwin.document.writeln('hc=new Array();$hcinit'); + popwin.document.writeln('<'+'/script>'); + popwin.document.writeln('<'+'/head>'+ + '<'+'body bgcolor="#FFFFFF">'+ + '<'+'image name="whirly" align="right" src="/adm/lonIcons/'+ + 'lonanim.gif" '+ + 'alt="animated logo" />'+ + '<'+'h3>Search Results Progress<'+'/h3>'+ + '<'+'form name="popremain">'+ + '<'+'tt>'+ + '<'+'br clear="all"/>PLEASE BE PATIENT'+ + '<'+'br />SCANNING $servernum SERVERS'+ + '<'+'br clear="all" />Number of record hits found '+ + '<'+'input type="text" size="10" name="numhits"'+ + ' value="0" />'+ + '<'+'br clear="all" />Time elapsed '+ + '<'+'input type="text" size="10" name="elapsetime"'+ + ' value="0" />'+ + '<'+'br />'+ + 'SERVER GRID (click on any cell for details)'+ + $grid + '<'+'br />'+ + 'Server details '+ + '<'+'input type="text" size="35" name="sdetails"'+ + ' value="" />'+ + '<'+'br />'+ + ' <'+'input type="button" name="button"'+ + ' value="close this window" '+ + ' onClick="javascript:opener.abortsearch()" />'+ + ' <'+'input type="button" name="button"'+ + ' value="help" onClick="javascript:opener.openhelp()" />'+ + '<'+'/tt>'+ + '<'+'/form>'+ + '<'+'/body><'+'/html>'); + popwin.document.close(); + +ENDPOP + return $result; +} + +###################################################################### +###################################################################### + +=pod + +=item Metadata Viewing Functions + +Output is a HTML-ified string. +Input arguments are title, author, subject, url, keywords, version, +notes, short abstract, mime, language, creation date, +last revision date, owner, copyright, hostname, and +extra custom metadata to show. + +=over 4 + +=item &detailed_citation_view() + +=cut + +###################################################################### +###################################################################### +sub detailed_citation_view { + my %values = @_; + my $result=<$values{'owner'}, last revised $values{'lastrevisiondate'} +

$values{'title'}

+

$values{'author'}

+

+

+Subject: $values{'subject'}
+Keyword(s): $values{'keywords'}
+Notes: $values{'notes'}
+MIME Type: +END + $result.=&Apache::loncommon::filedescription($values{'mime'}); + $result.=< +Language: +END + $result.=&Apache::loncommon::languagedescription($values{'lang'}); + $result.=< +Copyright/Distribution: +END + $result.=&Apache::loncommon::copyrightdescription($values{'copyright'}); + $result.=< +

+$values{'extrashow'} +

+$values{'shortabstract'} +

+END + return $result; +} + +###################################################################### +###################################################################### + +=pod + +=item &summary_view() + +=cut + +###################################################################### +###################################################################### +sub summary_view { + my %values = @_; + my $result=<$values{'author'}
+$values{'title'}
+$values{'owner'} -- $values{'lastrevisiondate'}
+$values{'copyrighttag'}
+$values{'extrashow'} +

+END + return $result; +} + +###################################################################### +###################################################################### + +=pod + +=item &fielded_format_view() + +=cut + +###################################################################### +###################################################################### +sub fielded_format_view { + my %values = @_; + my $result=<URL: $values{'url'} +
+Title: $values{'title'}
+Author(s): $values{'author'}
+Subject: $values{'subject'}
+Keyword(s): $values{'keywords'}
+Notes: $values{'notes'}
+MIME Type: $values{'mimetag'}
+Language: $values{'language'}
+Creation Date: $values{'creationdate'}
+Last Revision Date: $values{'lastrevisiondate'}
+Publisher/Owner: $values{'owner'}
+Copyright/Distribution: $values{'copyrighttag'}
+Repository Location: $values{'hostname'}
+Abstract: $values{'shortabstract'}
+$values{'extrashow'} +

+END + return $result; +} + +###################################################################### +###################################################################### + +=pod + +=item &xml_sgml_view() + +=back + +=cut + +###################################################################### +###################################################################### +sub xml_sgml_view { + my %values = @_; + my $result=< +<LonCapaResource> +<url>$values{'url'}</url> +<title>$values{'title'}</title> +<author>$values{'author'}</author> +<subject>$values{'subject'}</subject> +<keywords>$values{'keywords'}</keywords> +<notes>$values{'notes'}</notes> +<mimeInfo> +<mime>$values{'mime'}</mime> +<mimetag>$values{'mimetag'}</mimetag> +</mimeInfo> +<languageInfo> +<language>$values{'lang'}</language> +<languagetag>$values{'language'}</languagetag> +</languageInfo> +<creationdate>$values{'creationdate'}</creationdate> +<lastrevisiondate>$values{'lastrevisiondate'}</lastrevisiondate> +<owner>$values{'owner'}</owner> +<copyrightInfo> +<copyright>$values{'copyright'}</copyright> +<copyrighttag>$values{'copyrighttag'}</copyrighttag> +</copyrightInfo> +<repositoryLocation>$values{'hostname'}</repositoryLocation> +<shortabstract>$values{'shortabstract'}</shortabstract> +</LonCapaResource> + +$values{'extrashow'} +END + return $result; +} + +###################################################################### +###################################################################### + +=pod + +=item &filled() see if field is filled. + +=cut + +###################################################################### +###################################################################### +sub filled { + my ($field)=@_; + if ($field=~/\S/ && $field ne 'any') { + return 1; + } + else { + return 0; + } +} + +###################################################################### +###################################################################### + +=pod + +=item &output_blank_field_error() + +=cut + +###################################################################### +###################################################################### +sub output_blank_field_error { + my ($r)=@_; + # make query information persistent to allow for subsequent revision + my $persistent=&make_persistent(); + + $r->print(< + +The LearningOnline Network with CAPA +BEGINNING + $r->print(< - +

Search Catalog

+$persistent - +onClick='this.form.submit();' /> +$closebutton +
+

Helpful Message

+

+Incorrect search query due to blank entry fields. +You need to fill in the relevant +fields on the search page in order for a query to be +processed. +

+ + +RESULTS +} + +###################################################################### +###################################################################### + +=pod + +=item &output_date_error() + +Output a full html page with an error message. + +=cut + +###################################################################### +###################################################################### +sub output_date_error { + my ($r,$message)=@_; + # make query information persistent to allow for subsequent revision + my $persistent=&make_persistent(); + + $r->print(< + +The LearningOnline Network with CAPA + + + +

Search Catalog

+ $persistent -
-

Search Query

+ +$closebutton +
+

Helpful Message

-Basic search: $ENV{'form.basicexp'} +$message

-

Search Results

-$compiledresult RESULTS +} + +###################################################################### +###################################################################### + +=pod + +=item &start_fresh_session() + +Cleans the global %hash by removing all fields which begin with +'pre_' or 'store'. + +=cut + +###################################################################### +###################################################################### +sub start_fresh_session { + delete $hash{'mode_catalog'}; + foreach (keys %hash) { + if ($_ =~ /^pre_/) { + delete $hash{$_}; + } + if ($_ =~ /^store/) { + delete $hash{$_}; + } } } +###################################################################### +###################################################################### + +=pod + +=item &popwin_js() send javascript to popwin + +=cut + +###################################################################### +###################################################################### +sub popwin_js { + # Print javascript out to popwin, but make sure we dont generate + # any javascript errors in doing so. + my ($r,$text) = @_; + $r->print(<<"END"); + +END + $r->rflush(); +} + +###################################################################### +###################################################################### + +=pod + +=item &popwin_imgupdate() + +Send a given image (and its location) out to the browser. Takes as +input $r, loncapa server id, and an icon URL. + +=cut + +###################################################################### +###################################################################### +sub popwin_imgupdate { + my ($r,$server,$icon) = @_; + &popwin_js($r,'popwin.document.img_'.$Apache::lonnet::hostdom{$server}. + '_'.$server.'.'.'src="/adm/lonIcons/'.$icon.'";'); +} + 1; + __END__ + +=pod + +=back + +=cut