--- loncom/xml/lonxml.pm 2000/07/20 15:37:54 1.12 +++ loncom/xml/lonxml.pm 2002/07/23 14:17:45 1.183 @@ -1,169 +1,784 @@ # The LearningOnline Network with CAPA # XML Parser Module # +# $Id: lonxml.pm,v 1.183 2002/07/23 14:17:45 sakharuk 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/ +# +# Copyright for TtHfunc and TtMfunc by Ian Hutchinson. +# TtHfunc and TtMfunc (the "Code") may be compiled and linked into +# binary executable programs or libraries distributed by the +# Michigan State University (the "Licensee"), but any binaries so +# distributed are hereby licensed only for use in the context +# of a program or computational system for which the Licensee is the +# primary author or distributor, and which performs substantial +# additional tasks beyond the translation of (La)TeX into HTML. +# The C source of the Code may not be distributed by the Licensee +# to any other parties under any circumstances. +# # last modified 06/26/00 by Alexander Sakharuk +# 11/6 Gerd Kortemeyer +# 6/1/1 Gerd Kortemeyer +# 2/21,3/13 Guy +# 3/29,5/4 Gerd Kortemeyer +# 5/10 Scott Harrison +# 5/26 Gerd Kortemeyer +# 5/27 H. K. Ng +# 6/2,6/3,6/8,6/9 Gerd Kortemeyer +# 6/12,6/13 H. K. Ng +# 6/16 Gerd Kortemeyer +# 7/27 H. K. Ng +# 8/7,8/9,8/10,8/11,8/15,8/16,8/17,8/18,8/20,8/23,8/24 Gerd Kortemeyer +# Guy Albertelli +# 9/26 Gerd Kortemeyer +# Dec Guy Albertelli +# YEAR=2002 +# 1/1 Gerd Kortemeyer +# 1/2 Matthew Hall +# 1/3 Gerd Kortemeyer +# package Apache::lonxml; - +use vars +qw(@pwd @outputstack $redirection $import @extlinks $metamode $evaluate %insertlist @namespace $prevent_entity_encode); use strict; -use HTML::TokeParser; -use Safe; +use HTML::LCParser(); +use HTML::TreeBuilder(); +use HTML::Entities(); +use Safe(); +use Safe::Hole(); +use Math::Cephes(); +use Math::Random(); +use Opcode(); sub register { - my $space; - my @taglist; - my $temptag; - ($space,@taglist) = @_; - foreach $temptag (@taglist) { - $Apache::lonxml::alltags{$temptag}=$space; + my ($space,@taglist) = @_; + foreach my $temptag (@taglist) { + push(@{ $Apache::lonxml::alltags{$temptag} },$space); + } +} + +sub deregister { + my ($space,@taglist) = @_; + foreach my $temptag (@taglist) { + my $tempspace = $Apache::lonxml::alltags{$temptag}[-1]; + if ($tempspace eq $space) { + pop(@{ $Apache::lonxml::alltags{$temptag} }); + } } + #&printalltags(); } - -use Apache::style; -use Apache::lontexconvert; -use Apache::run; -use Apache::londefdef; -use Apache::scripttag; + +use Apache::Constants qw(:common); +use Apache::lontexconvert(); +use Apache::style(); +use Apache::run(); +use Apache::londefdef(); +use Apache::scripttag(); +use Apache::edit(); +use Apache::lonnet(); +use Apache::File(); +use Apache::loncommon(); + #================================================== Main subroutine: xmlparse +#debugging control, to turn on debugging modify the correct handler +$Apache::lonxml::debug=0; + +#path to the directory containing the file currently being processed +@pwd=(); + +#these two are used for capturing a subset of the output for later processing, +#don't touch them directly use &startredirection and &endredirection +@outputstack = (); +$redirection = 0; + +#controls wheter the tag actually does +$import = 1; +@extlinks=(); + +# meta mode is a bit weird only some output is to be turned off +# tag turns metamode off (defined in londefdef.pm) +$metamode = 0; + +# turns on and of run::evaluate actually derefencing var refs +$evaluate = 1; + +# data structure for eidt mode, determines what tags can go into what other tags +%insertlist=(); + +# stores the list of active tag namespaces +@namespace=(); + +# if 0 all high ASCII characters will be encoded into HTML Entities +$prevent_entity_encode=0; + +# has the dynamic menu been updated to know about this resource +$Apache::lonxml::registered=0; + +# a pointer the the Apache request object +$Apache::lonxml::request=''; + +sub xmlbegin { + my $output=''; + if ($ENV{'browser.mathml'}) { + $output='' + .'' + .']>' + .''; + } else { + $output=''; + } + return $output; +} + +sub xmlend { + my $discussion=''; + if ($ENV{'request.course.id'}) { + my $crs='/'.$ENV{'request.course.id'}; + if ($ENV{'request.course.sec'}) { + $crs.='_'.$ENV{'request.course.sec'}; + } + $crs=~s/\_/\//g; + my $seeid=&Apache::lonnet::allowed('rin',$crs); + my $symb=&Apache::lonnet::symbread(); + if ($symb) { + my %contrib=&Apache::lonnet::restore($symb,$ENV{'request.course.id'}, + $ENV{'course.'.$ENV{'request.course.id'}.'.domain'}, + $ENV{'course.'.$ENV{'request.course.id'}.'.num'}); + if ($contrib{'version'}) { + $discussion.= + '

Course Discussion of Resource

'; + my $idx; + for ($idx=1;$idx<=$contrib{'version'};$idx++) { + my $hidden=($contrib{'hidden'}=~/\.$idx\./); + unless (($hidden) && (!$seeid)) { + my $message=$contrib{$idx.':message'}; + $message=~s/\n/\
/g; + if ($message) { + if ($hidden) { + $message=''.$message.''; + } + my $sender='Anonymous'; + if ((!$contrib{$idx.':anonymous'}) || ($seeid)) { + $sender=$contrib{$idx.':plainname'}.' ('. + $contrib{$idx.':sendername'}.' at '. + $contrib{$idx.':senderdomain'}.')'; + if ($contrib{$idx.':anonymous'}) { + $sender.=' [anonymous] '. + $contrib{$idx.':screenname'}; + } + if ($seeid) { + if ($hidden) { + $sender.=' Make Visible'; + } else { + $sender.=' Hide'; + } + } + } else { + if ($contrib{$idx.':screenname'}) { + $sender=''.$contrib{$idx.':screenname'}.''; + } + } + $discussion.='

'.$sender.' ('. + localtime($contrib{$idx.':timestamp'}). + '):

'.$message. + '

'; + } + } + } + $discussion.='
'; + } + } + } + return $discussion.''; +} + +sub tokeninputfield { + my $defhost=$Apache::lonnet::perlvar{'lonHostID'}; + $defhost=~tr/a-z/A-Z/; + return (< + function updatetoken() { + var comp=new Array; + var barcode=unescape(document.tokeninput.barcode.value); + comp=barcode.split('*'); + if (typeof(comp[0])!="undefined") { + document.tokeninput.codeone.value=comp[0]; + } + if (typeof(comp[1])!="undefined") { + document.tokeninput.codetwo.value=comp[1]; + } + if (typeof(comp[2])!="undefined") { + comp[2]=comp[2].toUpperCase(); + document.tokeninput.codethree.value=comp[2]; + } + document.tokeninput.barcode.value=''; + } + +
+ + + + +
DocID Checkin
+ + + + + + + +
Scan in Barcode
or Type in DocID + +* + +* + +
+
+
+ENDINPUTFIELD +} + +sub maketoken { + my ($symb,$tuname,$tudom,$tcrsid)=@_; + unless ($symb) { + $symb=&Apache::lonnet::symbread(); + } + unless ($tuname) { + $tuname=$ENV{'user.name'}; + $tudom=$ENV{'user.domain'}; + $tcrsid=$ENV{'request.course.id'}; + } + + return &Apache::lonnet::checkout($symb,$tuname,$tudom,$tcrsid); +} + +sub printtokenheader { + my ($target,$token,$tsymb,$tcrsid,$tudom,$tuname)=@_; + unless ($token) { return ''; } + + my ($symb,$courseid,$domain,$name) = &Apache::lonxml::whichuser(); + unless ($tsymb) { + $tsymb=$symb; + } + unless ($tuname) { + $tuname=$name; + $tudom=$domain; + $tcrsid=$courseid; + } + + my %reply=&Apache::lonnet::get('environment', + ['firstname','middlename','lastname','generation'], + $tudom,$tuname); + my $plainname=$reply{'firstname'}.' '. + $reply{'middlename'}.' '. + $reply{'lastname'}.' '. + $reply{'generation'}; + + if ($target eq 'web') { + my %idhash=&Apache::lonnet::idrget($tudom,($tuname)); + return + ''. + 'Checked out for '.$plainname. + '
User: '.$tuname.' at '.$tudom. + '
ID: '.$idhash{$tuname}. + '
CourseID: '.$tcrsid. + '
Course: '.$ENV{'course.'.$tcrsid.'.description'}. + '
DocID: '.$token. + '
Time: '.localtime().'
'; + } else { + return $token; + } +} + +sub fontsettings() { + my $headerstring=''; + if (($ENV{'browser.os'} eq 'mac') && (!$ENV{'browser.mathml'})) { + $headerstring.= + ''; + } + return $headerstring; +} + +sub registerurl { + my $forcereg=shift; + my $target = shift; + my $result = ''; + if ($target eq 'edit') { + $result .="\n"; + } + if ((($ENV{'request.publicaccess'}) || + (!&Apache::lonnet::is_on_map($ENV{'REQUEST_URI'}))) && + (!$forcereg)) { + return $result. + ''; + } + if ($Apache::lonxml::registered && !$forcereg) { return ''; } + $Apache::lonxml::registered=1; + my $nothing=''; + if ($ENV{'browser.type'} eq 'explorer') { $nothing='javascript:void(0);'; } + my $timesync='menu.syncclock(1000*'.time.');'; + if (($ENV{'REQUEST_URI'}!~/^\/(res\/)*adm\//) || ($forcereg)) { + my $hwkadd=''; + if ($ENV{'request.filename'}=~/\.(problem|exam|quiz|assess|survey|form)$/) { + if (&Apache::lonnet::allowed('vgr',$ENV{'request.course.id'})) { + $hwkadd.=(< +// BEGIN LON-CAPA Internal + + function LONCAPAreg() { + menu=window.open("$nothing","LONCAPAmenu","",false); + menu.clearTimeout(menu.menucltim); + $timesync + menu.currentURL=window.location.pathname; + menu.reloadURL=window.location.pathname; + menu.currentStale=0; + menu.clearbut(3,1); + menu.switchbutton + (6,3,'catalog.gif','catalog','info','catalog_info()'); + menu.switchbutton + (8,1,'eval.gif','evaluate','this','gopost("/adm/evaluate",currentURL)'); + menu.switchbutton + (8,2,'fdbk.gif','feedback','on this','gopost("/adm/feedback",currentURL)'); + menu.switchbutton + (8,3,'prt.gif','prepare','printout','gopost("/adm/printout",currentURL)'); + menu.switchbutton + (2,1,'back.gif','backward','','gopost("/adm/flip","back:"+currentURL)'); + menu.switchbutton + (2,3,'forw.gif','forward','','gopost("/adm/flip","forward:"+currentURL)'); + menu.switchbutton + (9,1,'sbkm.gif','set','bookmark','set_bookmark()'); + menu.switchbutton + (9,2,'vbkm.gif','view','bookmark','edit_bookmarks()'); + menu.switchbutton + (9,3,'anot.gif','anno-','tations','annotate()'); + $hwkadd + } + + function LONCAPAstale() { + menu=window.open("$nothing","LONCAPAmenu","",false); + menu.currentStale=1; + if (menu.reloadURL!='' && menu.reloadURL!= null) { + menu.switchbutton + (3,1,'reload.gif','return','location','go(reloadURL)'); + } + menu.clearbut(7,1); + menu.clearbut(7,2); + menu.clearbut(7,3); + menu.menucltim=menu.setTimeout( + 'clearbut(2,1);clearbut(2,3);clearbut(8,1);clearbut(8,2);clearbut(8,3);'+ + 'clearbut(9,1);clearbut(9,2);clearbut(9,3);clearbut(6,3)', + 2000); + + } + +// END LON-CAPA Internal + +ENDREGTHIS + + } else { + $result = (< +// BEGIN LON-CAPA Internal + + function LONCAPAreg() { + menu=window.open("$nothing","LONCAPAmenu","",false); + $timesync + menu.currentStale=1; + menu.clearbut(2,1); + menu.clearbut(2,3); + menu.clearbut(8,1); + menu.clearbut(8,2); + menu.clearbut(8,3); + if (menu.currentURL) { + menu.switchbutton + (3,1,'reload.gif','return','location','go(currentURL)'); + } else { + menu.clearbut(3,1); + } + } + + function LONCAPAstale() { + } + +// END LON-CAPA Internal + +ENDDONOTREGTHIS + } + return $result; +} + +sub loadevents() { + return 'LONCAPAreg();'; +} + +sub unloadevents() { + return 'LONCAPAstale();'; +} + +sub printalltags { + my $temp; + foreach $temp (sort keys %Apache::lonxml::alltags) { + &Apache::lonxml::debug("$temp -- ". + join(',',@{ $Apache::lonxml::alltags{$temp} })); + } +} sub xmlparse { + my ($request,$target,$content_file_string,$safeinit,%style_for_target) = @_; + + &setup_globals($request,$target); +# +# do we have a course style file? +# + + if ($ENV{'request.course.id'}) { + my $bodytext= + $ENV{'course.'.$ENV{'request.course.id'}.'.default_xml_style'}; + if ($bodytext) { + my $location=&Apache::lonnet::filelocation('',$bodytext); + my $styletext=&Apache::lonnet::getfile($location); + if ($styletext ne '-1') { + %style_for_target = (%style_for_target, + &Apache::style::styleparser($target,$styletext)); + } + } + } + + #&printalltags(); + my @pars = (); + my $pwd=$ENV{'request.filename'}; + $pwd =~ s:/[^/]*$::; + &newparser(\@pars,\$content_file_string,$pwd); - my ($target,$content_file_string,%style_for_target) = @_; - my $pars = HTML::TokeParser->new(\$content_file_string); - my $currentstring = ''; - my $finaloutput = ''; - my $newarg = ''; my $safeeval = new Safe; - $safeeval->permit("entereval"); + my $safehole = new Safe::Hole; + &init_safespace($target,$safeeval,$safehole,$safeinit); #-------------------- Redefinition of the target in the case of compound target ($target, my @tenta) = split('&&',$target); -#------------------------- Stack definition (in stack we have all current tags) - - my @stack = (); + my @stack = (); my @parstack = (); + &initdepth; -#------------------------------------- Parse input string (content_file_string) - - my $token; - - while ($token = $pars->get_token) { - if ($token->[0] eq 'T') { - $finaloutput .= &Apache::run::evaluate($token->[1],$safeeval,''); - } elsif ($token->[0] eq 'S') { - # add tag to stack - push (@stack,$token->[1]); - # add parameters list to another stack - push (@parstack,&parstring($token)); - - if (exists $style_for_target{$token->[1]}) { - #basically recurse, but we never got more than one level down so just - #create the new context here - my @innerstack = (); - my @innerparstack = (); - # use style file definition - $newarg = $style_for_target{$token->[1]}; - my $pat = HTML::TokeParser->new(\$newarg); - my $tokenpat = ''; - my $partstring = ''; - - while ($tokenpat = $pat->get_token) { - if ($tokenpat->[0] eq 'T') { - $partstring = $tokenpat->[1]; - } elsif ($tokenpat->[0] eq 'S') { - push (@innerstack,$tokenpat->[1]); - push (@innerparstack,&parstring($tokenpat)); - $partstring = &callsub("start_$tokenpat->[1]", - $target, $tokenpat, \@innerparstack, - $pat, $safeeval); - } elsif ($tokenpat->[0] eq 'E') { - #clear out any tags that didn't end - while ($tokenpat->[1] ne $innerstack[$#innerstack] - && ($#innerstack > 0)) {pop @innerstack;pop @innerparstack;} - $partstring = &callsub("end_$tokenpat->[1]", - $target, $tokenpat, \@innerparstack, - $pat, $safeeval); - } - #pass both the variable to the style tag, and the tag we - #are processing inside the - $finaloutput .= &Apache::run::evaluate($partstring,$safeeval, - $parstack[$#parstack].$innerparstack[$#innerparstack]); - if ($tokenpat->[0] eq 'E') { pop @innerstack;pop @innerparstack; } - } - } else { - my $result = &callsub("start_$token->[1]", $target, $token,\@parstack, - $pars, $safeeval); - $finaloutput .= &Apache::run::evaluate($result,$safeeval, - $parstack[$#parstack]); - } - } elsif ($token->[0] eq 'E') { - #clear out any tags that didn't end - while ($token->[1] ne $stack[$#stack] - && ($#stack > 0)) {pop @stack;pop @parstack;} - - if (exists $style_for_target{'/'."$token->[1]"}) { - my @innerstack = (); - my @innerparstack = (); - $newarg = $style_for_target{'/'."$token->[1]"}; - -# print "qqq: $token->[1],$newarg\n"; - - my $pat = HTML::TokeParser->new(\$newarg); - my $tokenpat; - my $partstring = ''; - - while ($tokenpat = $pat->get_token) { - if ($tokenpat->[0] eq 'T') { - $partstring = $tokenpat->[1]; - } elsif ($tokenpat->[0] eq 'S') { - push (@innerstack,$tokenpat->[1]); - push (@innerparstack,&parstring($tokenpat)); - $partstring = &callsub("start_$tokenpat->[1]", - $target, $tokenpat, \@innerparstack, - $pat, $safeeval); - } elsif ($tokenpat->[0] eq 'E') { - #clear out any tags that didn't end - while ($tokenpat->[1] ne $innerstack[$#innerstack] - && ($#innerstack > 0)) {pop @innerstack;pop @innerparstack;} - $partstring = &callsub("end_$tokenpat->[1]", - $target, $tokenpat, \@innerparstack, - $pat, $safeeval); - } - #pass both the variable to the style tag, and the tag we - #are processing inside the - $finaloutput .= &Apache::run::evaluate($partstring,$safeeval, - $parstack[$#parstack].$innerparstack[$#innerparstack]); - if ($tokenpat->[0] eq 'E') { pop @innerstack;pop @innerparstack; } - } - } else { - my $result = &callsub("end_$token->[1]", $target, $token, \@parstack, - $pars,$safeeval); - $finaloutput .= &Apache::run::evaluate($result,$safeeval, - $parstack[$#parstack]); - } - pop @stack; - pop @parstack; - } + my $finaloutput = &inner_xmlparse($target,\@stack,\@parstack,\@pars, + $safeeval,\%style_for_target); + if ($ENV{'request.uri'}) { + &writeallows($ENV{'request.uri'}); } return $finaloutput; } +sub htmlclean { + my ($raw,$full)=@_; + + my $tree = HTML::TreeBuilder->new; + $tree->ignore_unknown(0); + + $tree->parse($raw); + + my $output= $tree->as_HTML(undef,' '); + + $output=~s/\<(br|hr|img|meta|allow)(.*?)\>/\<$1$2 \/\>/gis; + $output=~s/\<\/(br|hr|img|meta|allow)\>//gis; + unless ($full) { + $output=~s/\<[\/]*(body|head|html)\>//gis; + } + + $tree = $tree->delete; + + return $output; +} + +sub inner_xmlparse { + my ($target,$stack,$parstack,$pars,$safeeval,$style_for_target)=@_; + my $finaloutput = ''; + my $result; + my $token; + while ( $#$pars > -1 ) { + while ($token = $$pars['-1']->get_token) { + if (($token->[0] eq 'T') || ($token->[0] eq 'C') || ($token->[0] eq 'D') ) { + if ($metamode<1) { + if ($target eq 'tex') { + my @temp_array = @$stack; + if ($temp_array[-1] ne 'm') { + if ($temp_array[-1] ne 'tt') { + if ($token->[1]=~m/\^/) {$token->[1]=~s/\^/\\verb|\^|/g;} + } else { + if ($token->[1]=~m/\^/) {$token->[1]=~s/\^/}\\verb|\^|{/g;} + } + if ($token->[1]=~m/>/) {$token->[1]=~s/>/\$>\$/g;} + if ($token->[1]=~m/[1]=~s/[1]; + } + } elsif ($token->[0] eq 'PI') { + if ($metamode<1) { + $result=$token->[2]; + } + } elsif ($token->[0] eq 'S') { + # add tag to stack + push (@$stack,$token->[1]); + # add parameters list to another stack + push (@$parstack,&parstring($token)); + &increasedepth($token); + if (exists $$style_for_target{$token->[1]}) { + if ($Apache::lonxml::redirection) { + $Apache::lonxml::outputstack['-1'] .= + &recurse($$style_for_target{$token->[1]},$target,$safeeval, + $style_for_target,@$parstack); + } else { + $finaloutput .= &recurse($$style_for_target{$token->[1]},$target, + $safeeval,$style_for_target,@$parstack); + } + } else { + $result = &callsub("start_$token->[1]", $target, $token, $stack, + $parstack, $pars, $safeeval, $style_for_target); + } + } elsif ($token->[0] eq 'E') { + #clear out any tags that didn't end + while ($token->[1] ne $$stack['-1'] && ($#$stack > -1)) { + my $lasttag=$$stack[-1]; + if ($token->[1] =~ /^$lasttag$/i) { + &Apache::lonxml::warning('Using tag </'.$token->[1].'> as end tag to <'.$$stack[-1].'>'); + last; + } else { + &Apache::lonxml::warning('Found tag </'.$token->[1].'> when looking for </'.$$stack[-1].'> in file'); + &end_tag($stack,$parstack,$token); + } + } + + if (exists($$style_for_target{'/'."$token->[1]"})) { + if ($Apache::lonxml::redirection) { + $Apache::lonxml::outputstack['-1'] .= + &recurse($$style_for_target{'/'."$token->[1]"}, + $target,$safeeval,$style_for_target,@$parstack); + } else { + $finaloutput .= &recurse($$style_for_target{'/'."$token->[1]"}, + $target,$safeeval,$style_for_target, + @$parstack); + } + } else { + $result = &callsub("end_$token->[1]", $target, $token, $stack, + $parstack, $pars,$safeeval, $style_for_target); + } + } else { + &Apache::lonxml::error("Unknown token event :$token->[0]:$token->[1]:"); + } + #evaluate variable refs in result + if ($result ne "") { + if ( $#$parstack > -1 ) { + $result=&Apache::run::evaluate($result,$safeeval,$$parstack[-1]); + } else { + $result= &Apache::run::evaluate($result,$safeeval,''); + } + } + # Encode any high ASCII characters + if (!$Apache::lonxml::prevent_entity_encode) { + $result=&HTML::Entities::encode($result,"\200-\377"); + } + if ($Apache::lonxml::redirection) { + $Apache::lonxml::outputstack['-1'] .= $result; + } else { + $finaloutput.=$result; + } + $result = ''; + + if ($token->[0] eq 'E') { + &end_tag($stack,$parstack,$token); + } + } + pop @$pars; + pop @Apache::lonxml::pwd; + } + + # if ($target eq 'meta') { + # $finaloutput.=&endredirection; + # } + + + if (($ENV{'QUERY_STRING'}) && ($target eq 'web')) { + $finaloutput=&afterburn($finaloutput); + } + return $finaloutput; +} + +sub recurse { + my @innerstack = (); + my @innerparstack = (); + my ($newarg,$target,$safeeval,$style_for_target,@parstack) = @_; + my @pat = (); + &newparser(\@pat,\$newarg); + my $tokenpat; + my $partstring = ''; + my $output=''; + my $decls=''; + &Apache::lonxml::debug("Recursing"); + while ( $#pat > -1 ) { + while ($tokenpat = $pat[$#pat]->get_token) { + if (($tokenpat->[0] eq 'T') || ($tokenpat->[0] eq 'C') || ($tokenpat->[0] eq 'D') ) { + if ($metamode<1) { $partstring=$tokenpat->[1]; } + } elsif ($tokenpat->[0] eq 'PI') { + if ($metamode<1) { $partstring=$tokenpat->[2]; } + } elsif ($tokenpat->[0] eq 'S') { + push (@innerstack,$tokenpat->[1]); + push (@innerparstack,&parstring($tokenpat)); + &increasedepth($tokenpat); + $partstring = &callsub("start_$tokenpat->[1]", $target, $tokenpat, + \@innerstack, \@innerparstack, \@pat, + $safeeval, $style_for_target); + } elsif ($tokenpat->[0] eq 'E') { + #clear out any tags that didn't end + while ($tokenpat->[1] ne $innerstack[$#innerstack] + && ($#innerstack > -1)) { + my $lasttag=$innerstack[-1]; + if ($tokenpat->[1] =~ /^$lasttag$/i) { + &Apache::lonxml::warning('Using tag </'.$tokenpat->[1].'> as end tag to <'.$innerstack[-1].'>'); + last; + } else { + &Apache::lonxml::warning('Found tag </'.$tokenpat->[1].'> when looking for </'.$innerstack[-1].'> in file'); + &end_tag(\@innerstack,\@innerparstack,$tokenpat); + } + } + $partstring = &callsub("end_$tokenpat->[1]", $target, $tokenpat, + \@innerstack, \@innerparstack, \@pat, + $safeeval, $style_for_target); + } else { + &Apache::lonxml::error("Unknown token event :$tokenpat->[0]:$tokenpat->[1]:"); + } + #pass both the variable to the style tag, and the tag we + #are processing inside the + if ( $partstring ne "" ) { + if ( $#parstack > -1 ) { + if ( $#innerparstack > -1 ) { + $decls= $parstack[$#parstack].$innerparstack[$#innerparstack]; + } else { + $decls= $parstack[$#parstack]; + } + } else { + if ( $#innerparstack > -1 ) { + $decls=$innerparstack[$#innerparstack]; + } else { + $decls=''; + } + } + $output .= &Apache::run::evaluate($partstring,$safeeval,$decls); + $partstring = ''; + } + if ($tokenpat->[0] eq 'E') { pop @innerstack;pop @innerparstack; + &decreasedepth($tokenpat);} + } + pop @pat; + pop @Apache::lonxml::pwd; + } + &Apache::lonxml::debug("Exiting Recursing"); + return $output; +} + sub callsub { - my ($sub,$target,$token,$parstack,$parser,$safeeval)=@_; + my ($sub,$target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_; my $currentstring=''; + my $nodefault; { + my $sub1; no strict 'refs'; - if (my $space=$Apache::lonxml::alltags{$token->[1]}) { - #print "Calling sub $sub in $space \n"; - $sub="$space\:\:$sub"; - $currentstring = &$sub($target,$token,\@$parstack,$parser,$safeeval); - } else { - #print "NOT Calling sub $sub\n"; - if (defined($token->[4])) { - $currentstring = $token->[4]; + my $tag=$token->[1]; + my $space=$Apache::lonxml::alltags{$tag}[-1]; + if (!$space) { + $tag=~tr/A-Z/a-z/; + $sub=~tr/A-Z/a-z/; + $space=$Apache::lonxml::alltags{$tag}[-1] + } + + my $deleted=0; + $Apache::lonxml::curdepth=join('_',@Apache::lonxml::depthcounter); + if (($token->[0] eq 'S') && ($target eq 'modified')) { + $deleted=&Apache::edit::handle_delete($space,$target,$token,$tagstack, + $parstack,$parser,$safeeval, + $style); + } + if (!$deleted) { + if ($space) { + #&Apache::lonxml::debug("Calling sub $sub in $space $metamode"); + $sub1="$space\:\:$sub"; + ($currentstring,$nodefault) = &$sub1($target,$token,$tagstack, + $parstack,$parser,$safeeval, + $style); } else { - $currentstring = $token->[2]; + #&Apache::lonxml::debug("NOT Calling sub $sub in $space $metamode"); + if ($metamode <1) { + if (defined($token->[4]) && ($metamode < 1)) { + $currentstring = $token->[4]; + } else { + $currentstring = $token->[2]; + } + } + } + # &Apache::lonxml::debug("nodefalt:$nodefault:"); + if ($currentstring eq '' && $nodefault eq '') { + if ($target eq 'edit') { + &Apache::lonxml::debug("doing default edit for $token->[1]"); + if ($token->[0] eq 'S') { + $currentstring = &Apache::edit::tag_start($target,$token); + } elsif ($token->[0] eq 'E') { + $currentstring = &Apache::edit::tag_end($target,$token); + } + } elsif ($target eq 'modified') { + if ($token->[0] eq 'S') { + $currentstring = $token->[4]; + $currentstring.=&Apache::edit::handle_insert(); + } else { + $currentstring = $token->[2]; + } + } } } use strict 'refs'; @@ -171,16 +786,621 @@ sub callsub { return $currentstring; } +sub setup_globals { + my ($request,$target)=@_; + $Apache::lonxml::request=$request; + $Apache::lonxml::registered = 0; + @Apache::lonxml::pwd=(); + @Apache::lonxml::extlinks=(); + if ($target eq 'meta') { + $Apache::lonxml::redirection = 0; + $Apache::lonxml::metamode = 1; + $Apache::lonxml::evaluate = 1; + $Apache::lonxml::import = 0; + } elsif ($target eq 'answer') { + $Apache::lonxml::redirection = 0; + $Apache::lonxml::metamode = 1; + $Apache::lonxml::evaluate = 1; + $Apache::lonxml::import = 1; + } elsif ($target eq 'grade') { + &startredirection; + $Apache::lonxml::metamode = 0; + $Apache::lonxml::evaluate = 1; + $Apache::lonxml::import = 1; + } elsif ($target eq 'modified') { + $Apache::lonxml::redirection = 0; + $Apache::lonxml::metamode = 0; + $Apache::lonxml::evaluate = 0; + $Apache::lonxml::import = 0; + } elsif ($target eq 'edit') { + $Apache::lonxml::redirection = 0; + $Apache::lonxml::metamode = 0; + $Apache::lonxml::evaluate = 0; + $Apache::lonxml::import = 0; + } elsif ($target eq 'analyze') { + $Apache::lonxml::redirection = 0; + $Apache::lonxml::metamode = 0; + $Apache::lonxml::evaluate = 1; + $Apache::lonxml::import = 1; + } else { + $Apache::lonxml::redirection = 0; + $Apache::lonxml::metamode = 0; + $Apache::lonxml::evaluate = 1; + $Apache::lonxml::import = 1; + } +} + +sub init_safespace { + my ($target,$safeeval,$safehole,$safeinit) = @_; + $safeeval->permit("entereval"); + $safeeval->permit(":base_math"); + $safeeval->permit("sort"); + $safeeval->deny(":base_io"); + $safehole->wrap(\&Apache::scripttag::xmlparse,$safeeval,'&xmlparse'); + $safehole->wrap(\&Apache::lonnet::EXT,$safeeval,'&EXT'); + + $safehole->wrap(\&Math::Cephes::asin,$safeeval,'&asin'); + $safehole->wrap(\&Math::Cephes::acos,$safeeval,'&acos'); + $safehole->wrap(\&Math::Cephes::atan,$safeeval,'&atan'); + $safehole->wrap(\&Math::Cephes::sinh,$safeeval,'&sinh'); + $safehole->wrap(\&Math::Cephes::cosh,$safeeval,'&cosh'); + $safehole->wrap(\&Math::Cephes::tanh,$safeeval,'&tanh'); + $safehole->wrap(\&Math::Cephes::asinh,$safeeval,'&asinh'); + $safehole->wrap(\&Math::Cephes::acosh,$safeeval,'&acosh'); + $safehole->wrap(\&Math::Cephes::atanh,$safeeval,'&atanh'); + $safehole->wrap(\&Math::Cephes::erf,$safeeval,'&erf'); + $safehole->wrap(\&Math::Cephes::erfc,$safeeval,'&erfc'); + $safehole->wrap(\&Math::Cephes::j0,$safeeval,'&j0'); + $safehole->wrap(\&Math::Cephes::j1,$safeeval,'&j1'); + $safehole->wrap(\&Math::Cephes::jn,$safeeval,'&jn'); + $safehole->wrap(\&Math::Cephes::jv,$safeeval,'&jv'); + $safehole->wrap(\&Math::Cephes::y0,$safeeval,'&y0'); + $safehole->wrap(\&Math::Cephes::y1,$safeeval,'&y1'); + $safehole->wrap(\&Math::Cephes::yn,$safeeval,'&yn'); + $safehole->wrap(\&Math::Cephes::yv,$safeeval,'&yv'); + $safehole->wrap(\&Math::Random::random_beta,$safeeval,'&math_random_beta'); + $safehole->wrap(\&Math::Random::random_chi_square,$safeeval,'&math_random_chi_square'); + $safehole->wrap(\&Math::Random::random_exponential,$safeeval,'&math_random_exponential'); + $safehole->wrap(\&Math::Random::random_f,$safeeval,'&math_random_f'); + $safehole->wrap(\&Math::Random::random_gamma,$safeeval,'&math_random_gamma'); + $safehole->wrap(\&Math::Random::random_multivariate_normal,$safeeval,'&math_random_multivariate_normal'); + $safehole->wrap(\&Math::Random::random_multinomial,$safeeval,'&math_random_multinomial'); + $safehole->wrap(\&Math::Random::random_noncentral_chi_square,$safeeval,'&math_random_noncentral_chi_square'); + $safehole->wrap(\&Math::Random::random_noncentral_f,$safeeval,'&math_random_noncentral_f'); + $safehole->wrap(\&Math::Random::random_normal,$safeeval,'&math_random_normal'); + $safehole->wrap(\&Math::Random::random_permutation,$safeeval,'&math_random_permutation'); + $safehole->wrap(\&Math::Random::random_permuted_index,$safeeval,'&math_random_permuted_index'); + $safehole->wrap(\&Math::Random::random_uniform,$safeeval,'&math_random_uniform'); + $safehole->wrap(\&Math::Random::random_poisson,$safeeval,'&math_random_poisson'); + $safehole->wrap(\&Math::Random::random_uniform_integer,$safeeval,'&math_random_uniform_integer'); + $safehole->wrap(\&Math::Random::random_negative_binomial,$safeeval,'&math_random_negative_binomial'); + $safehole->wrap(\&Math::Random::random_binomial,$safeeval,'&math_random_binomial'); + $safehole->wrap(\&Math::Random::random_seed_from_phrase,$safeeval,'&random_seed_from_phrase'); + $safehole->wrap(\&Math::Random::random_set_seed_from_phrase,$safeeval,'&random_set_seed_from_phrase'); + $safehole->wrap(\&Math::Random::random_get_seed,$safeeval,'&random_get_seed'); + $safehole->wrap(\&Math::Random::random_set_seed,$safeeval,'&random_set_seed'); + +#need to inspect this class of ops +# $safeeval->deny(":base_orig"); + $safeinit .= ';$external::target="'.$target.'";'; + my $rndseed; + my ($symb,$courseid,$domain,$name) = &Apache::lonxml::whichuser(); + $rndseed=&Apache::lonnet::rndseed($symb,$courseid,$domain,$name); + $safeinit .= ';$external::randomseed='.$rndseed.';'; + &Apache::run::run($safeinit,$safeeval); +} + +sub startredirection { + $Apache::lonxml::redirection++; + push (@Apache::lonxml::outputstack, ''); +} + +sub endredirection { + if (!$Apache::lonxml::redirection) { + &Apache::lonxml::error("Endredirection was called, before a startredirection, perhaps you have unbalanced tags. Some debuging information:".join ":",caller); + return ''; + } + $Apache::lonxml::redirection--; + pop @Apache::lonxml::outputstack; +} + +sub end_tag { + my ($tagstack,$parstack,$token)=@_; + pop(@$tagstack); + pop(@$parstack); + &decreasedepth($token); +} + +sub initdepth { + @Apache::lonxml::depthcounter=(); + $Apache::lonxml::depth=-1; + $Apache::lonxml::olddepth=-1; +} + +sub increasedepth { + my ($token) = @_; + $Apache::lonxml::depth++; + $Apache::lonxml::depthcounter[$Apache::lonxml::depth]++; + if ($Apache::lonxml::depthcounter[$Apache::lonxml::depth]==1) { + $Apache::lonxml::olddepth=$Apache::lonxml::depth; + } + my $curdepth=join('_',@Apache::lonxml::depthcounter); + &Apache::lonxml::debug("s $Apache::lonxml::depth : $Apache::lonxml::olddepth : $curdepth : $token->[1]\n"); +#print "
s $Apache::lonxml::depth : $Apache::lonxml::olddepth : $curdepth : $token->[1]\n"; +} + +sub decreasedepth { + my ($token) = @_; + $Apache::lonxml::depth--; + if ($Apache::lonxml::depth<$Apache::lonxml::olddepth-1) { + $#Apache::lonxml::depthcounter--; + $Apache::lonxml::olddepth=$Apache::lonxml::depth+1; + } + if ( $Apache::lonxml::depth < -1) { + &Apache::lonxml::warning("Missing tags, unable to properly run file."); + $Apache::lonxml::depth='-1'; + } + my $curdepth=join('_',@Apache::lonxml::depthcounter); + &Apache::lonxml::debug("e $Apache::lonxml::depth : $Apache::lonxml::olddepth : $token->[1] : $curdepth\n"); +#print "
e $Apache::lonxml::depth : $Apache::lonxml::olddepth : $token->[1] : $curdepth\n"; +} + +sub get_all_text_unbalanced { + my($tag,$pars)= @_; + my $token; + my $result=''; + $tag='<'.$tag.'>'; + while ($token = $$pars[-1]->get_token) { + if (($token->[0] eq 'T')||($token->[0] eq 'C')||($token->[0] eq 'D')) { + $result.=$token->[1]; + } elsif ($token->[0] eq 'PI') { + $result.=$token->[2]; + } elsif ($token->[0] eq 'S') { + $result.=$token->[4]; + } elsif ($token->[0] eq 'E') { + $result.=$token->[2]; + } + if ($result =~ /(.*)$tag(.*)/) { + &Apache::lonxml::debug('Got a winner with leftovers ::'.$2); + &Apache::lonxml::debug('Result is :'.$1); + $result=$1; + my $redo=$tag.$2; + &Apache::lonxml::newparser($pars,\$redo); + last; + } + } + return $result +} + +sub get_all_text { + my($tag,$pars)= @_; + my $depth=0; + my $token; + my $result=''; + if ( $tag =~ m:^/: ) { + my $tag=substr($tag,1); +# &Apache::lonxml::debug("have:$tag:"); + while (($depth >=0) && ($token = $pars->get_token)) { +# &Apache::lonxml::debug("e token:$token->[0]:$depth:$token->[1]"); + if (($token->[0] eq 'T')||($token->[0] eq 'C')||($token->[0] eq 'D')) { + $result.=$token->[1]; + } elsif ($token->[0] eq 'PI') { + $result.=$token->[2]; + } elsif ($token->[0] eq 'S') { + if ($token->[1] =~ /^$tag$/i) { $depth++; } + $result.=$token->[4]; + } elsif ($token->[0] eq 'E') { + if ( $token->[1] =~ /^$tag$/i) { $depth--; } + #skip sending back the last end tag + if ($depth > -1) { $result.=$token->[2]; } else { + $pars->unget_token($token); + } + } + } + } else { + while ($token = $pars->get_token) { +# &Apache::lonxml::debug("s token:$token->[0]:$depth:$token->[1]"); + if (($token->[0] eq 'T')||($token->[0] eq 'C')||($token->[0] eq 'D')) { + $result.=$token->[1]; + } elsif ($token->[0] eq 'PI') { + $result.=$token->[2]; + } elsif ($token->[0] eq 'S') { + if ( $token->[1] =~ /^$tag$/i) { + $pars->unget_token($token); last; + } else { + $result.=$token->[4]; + } + } elsif ($token->[0] eq 'E') { + $result.=$token->[2]; + } + } + } +# &Apache::lonxml::debug("Exit:$result:"); + return $result +} + +sub newparser { + my ($parser,$contentref,$dir) = @_; + push (@$parser,HTML::LCParser->new($contentref)); + $$parser['-1']->xml_mode('1'); + if ( $dir eq '' ) { + push (@Apache::lonxml::pwd, $Apache::lonxml::pwd[$#Apache::lonxml::pwd]); + } else { + push (@Apache::lonxml::pwd, $dir); + } +# &Apache::lonxml::debug("pwd:$#Apache::lonxml::pwd"); +# &Apache::lonxml::debug("pwd:$Apache::lonxml::pwd[$#Apache::lonxml::pwd]"); +} + sub parstring { my ($token) = @_; my $temp=''; - map {$temp .= "my \$$_=\"$token->[2]->{$_}\";"} @{$token->[3]}; + foreach (@{$token->[3]}) { + unless ($_=~/\W/) { + my $val=$token->[2]->{$_}; + $val =~ s/([\%\@\\\"])/\\$1/g; + #if ($val =~ m/^[\%\@]/) { $val="\\".$val; } + $temp .= "my \$$_=\"$val\";" + } + } return $temp; } -1; -__END__ +sub writeallows { + unless ($#extlinks>=0) { return; } + my $thisurl='/res/'.&Apache::lonnet::declutter(shift); + if ($ENV{'httpref.'.$thisurl}) { + $thisurl=$ENV{'httpref.'.$thisurl}; + } + my $thisdir=$thisurl; + $thisdir=~s/\/[^\/]+$//; + my %httpref=(); + foreach (@extlinks) { + $httpref{'httpref.'. + &Apache::lonnet::hreflocation($thisdir,$_)}=$thisurl; + } + @extlinks=(); + &Apache::lonnet::appenv(%httpref); +} + +# +# Afterburner handles anchors, highlights and links +# +sub afterburn { + my $result=shift; + &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'}, + ['highlight','anchor','link']); + if ($ENV{'form.highlight'}) { + foreach (split(/\,/,$ENV{'form.highlight'})) { + my $anchorname=$_; + my $matchthis=$anchorname; + $matchthis=~s/\_+/\\s\+/g; + $result=~s/($matchthis)/\$1\<\/font\>/gs; + } + } + if ($ENV{'form.link'}) { + foreach (split(/\,/,$ENV{'form.link'})) { + my ($anchorname,$linkurl)=split(/\>/,$_); + my $matchthis=$anchorname; + $matchthis=~s/\_+/\\s\+/g; + $result=~s/($matchthis)/\$1\<\/a\>/gs; + } + } + if ($ENV{'form.anchor'}) { + my $anchorname=$ENV{'form.anchor'}; + my $matchthis=$anchorname; + $matchthis=~s/\_+/\\s\+/g; + $result=~s/($matchthis)/\$1\<\/a\>/s; + $result.=(<<"ENDSCRIPT"); + +ENDSCRIPT + } + return $result; +} + +sub storefile { + my ($file,$contents)=@_; + if (my $fh=Apache::File->new('>'.$file)) { + print $fh $contents; + $fh->close(); + } else { + &warning("Unable to save file $file"); + } +} + +sub createnewhtml { + my $filecontents=(< + + + Title of Document Goes Here + + + + + Body of Document Goes Here + + + +SIMPLECONTENT + return $filecontents; +} + + +sub inserteditinfo { + my ($result,$filecontents)=@_; + $filecontents = &HTML::Entities::encode($filecontents); +# my $editheader='Edit below
'; + my $buttons=(< + + +BUTTONS + my $editfooter=(< + +
+ +$buttons
+ +
$buttons +
+
+ENDFOOTER +# $result=~s/(\]*\>)/$1$editheader/is; + $result=~s/(\<\/body\>)/$editfooter/is; + return $result; +} + +sub get_target { + my $viewgrades=&Apache::lonnet::allowed('vgr',$ENV{'request.course.id'}); + if ( $ENV{'request.state'} eq 'published') { + if ( defined($ENV{'form.grade_target'}) + && ($viewgrades == 'F' )) { + return ($ENV{'form.grade_target'}); + } elsif (defined($ENV{'form.grade_target'})) { + if (($ENV{'form.grade_target'} eq 'web') || + ($ENV{'form.grade_target'} eq 'tex') ) { + return $ENV{'form.grade_target'} + } else { + return 'web'; + } + } else { + return 'web'; + } + } elsif ($ENV{'request.state'} eq 'construct') { + if ( defined($ENV{'form.grade_target'})) { + return ($ENV{'form.grade_target'}); + } else { + return 'web'; + } + } else { + return 'web'; + } +} + +sub handler { + my $request=shift; + + my $target=&get_target(); + + $Apache::lonxml::debug=0; + + if ($ENV{'browser.mathml'}) { + $request->content_type('text/xml'); + } else { + $request->content_type('text/html'); + } + &Apache::loncommon::no_cache($request); + $request->send_http_header; + + return OK if $request->header_only; + + + my $file=&Apache::lonnet::filelocation("",$request->uri); +# +# Edit action? Save file. +# + unless ($ENV{'request.state'} eq 'published') { + if (($ENV{'form.savethisfile'}) || ($ENV{'form.attemptclean'})) { + &storefile($file,$ENV{'form.filecont'}); + } + } + my %mystyle; + my $result = ''; + my $filecontents=&Apache::lonnet::getfile($file); + if ($filecontents == -1) { + $result=(< + +File not found + + +File not found: $file + + +ENDNOTFOUND + $filecontents=''; + if ($ENV{'request.state'} ne 'published') { + $filecontents=&createnewhtml(); + $ENV{'form.editmode'}='Edit'; #force edit mode + } + } else { + unless ($ENV{'request.state'} eq 'published') { + if ($ENV{'form.attemptclean'}) { + $filecontents=&htmlclean($filecontents,1); + } + } + if (!$ENV{'form.editmode'} || $ENV{'form.viewmode'}) { + $result = &Apache::lonxml::xmlparse($request,$target,$filecontents, + '',%mystyle); + } + } + +# +# Edit action? Insert editing commands +# + unless ($ENV{'request.state'} eq 'published') { + if ($ENV{'form.editmode'} && (!($ENV{'form.viewmode'}))) { + my $displayfile=$request->uri; + $displayfile=~s/^\/[^\/]*//; + $result='

'.$displayfile. + '

'; + $result=&inserteditinfo($result,$filecontents); + } + } + + writeallows($request->uri); + + $request->print($result); + + return OK; +} + +sub debug { + if ($Apache::lonxml::debug eq 1) { + $|=1; + print("DEBUG:".&HTML::Entities::encode($_[0])."
\n"); + } +} + +sub error { + if (($Apache::lonxml::debug eq 1) || ($ENV{'request.state'} eq 'construct') ) { + # If printing in construction space, put the error inside 

+    print "ERROR:".join("\n",@_)."\n";
+  } else {
+    print "An Error occured while processing this resource. The instructor has been notified. 
";
+    #notify author
+    &Apache::lonmsg::author_res_msg($ENV{'request.filename'},join('
',@_));
+    #notify course
+    if ( $ENV{'request.course.id'} ) {
+      my $users=$ENV{'course.'.$ENV{'request.course.id'}.'.comment.email'};
+      my $declutter=&Apache::lonnet::declutter($ENV{'request.filename'});
+      foreach my $user (split /\,/, $users) {
+	($user,my $domain) = split /:/, $user;
+	&Apache::lonmsg::user_normal_msg($user,$domain,
+        "Error [$declutter]",join('
',@_));
+      }
+    }
+
+    #FIXME probably shouldn't have me get everything forever.
+    &Apache::lonmsg::user_normal_msg('albertel','msu',"Error in $ENV{'request.filename'}",join('
',@_));
+    #&Apache::lonmsg::user_normal_msg('albertel','103',"Error in $ENV{'request.filename'}",$_[0]);
+  }
+}
+
+sub warning {
+  if ($ENV{'request.state'} eq 'construct') {
+    print "WARNING:".join('
',@_)."
\n";
+  }
+}
+
+sub get_param {
+  my ($param,$parstack,$safeeval,$context) = @_;
+  if ( ! $context ) { $context = -1; }
+  my $args ='';
+  if ( $#$parstack > (-2-$context) ) { $args=$$parstack[$context]; }
+  if ( ! $args ) { return undef; }
+  if ( $args =~ /my \$$param=\"/ ) {
+    return &Apache::run::run("{$args;".'return $'.$param.'}',$safeeval); #'
+  } else {
+    return undef;
+  }
+}
+
+sub get_param_var {
+  my ($param,$parstack,$safeeval,$context) = @_;
+  if ( ! $context ) { $context = -1; }
+  my $args ='';
+  if ( $#$parstack > (-2-$context) ) { $args=$$parstack[$context]; }
+  if ( $args !~ /my \$$param=\"/ ) { return undef; }
+  my $value=&Apache::run::run("{$args;".'return $'.$param.'}',$safeeval); #'
+  if ($value =~ /^[\$\@\%]/) {
+    return &Apache::run::run("return $value",$safeeval,1);
+  } else {
+    return $value;
+  }
+}
 
+sub register_insert {
+  my @data = split /\n/, &Apache::lonnet::getfile('/home/httpd/lonTabs/insertlist.tab');
+  my $i;
+  my $tagnum=0;
+  my @order;
+  for ($i=0;$i < $#data; $i++) {
+    my $line = $data[$i];
+    if ( $line =~ /^\#/ || $line =~ /^\s*\n/) { next; }
+    if ( $line =~ /TABLE/ ) { last; }
+    my ($tag,$descrip,$color,$function,$show) = split(/,/, $line);
+    if ($tag) {
+      $insertlist{"$tagnum.tag"} = $tag;
+      $insertlist{"$tagnum.description"} = $descrip;
+      $insertlist{"$tagnum.color"} = $color;
+      $insertlist{"$tagnum.function"} = $function;
+      if (!defined($show)) { $show='yes'; }
+      $insertlist{"$tagnum.show"}= $show;
+      $insertlist{"$tag.num"}=$tagnum;
+      $tagnum++;
+    }
+  }
+  $i++; #skipping TABLE line
+  $tagnum = 0;
+  for (;$i < $#data;$i++) {
+    my $line = $data[$i];
+    my ($mnemonic,@which) = split(/ +/,$line);
+    my $tag = $insertlist{"$tagnum.tag"};
+    for (my $j=0;$j <=$#which;$j++) {
+      if ( $which[$j] eq 'Y' ) {
+	if ($insertlist{"$j.show"} ne 'no') {
+	  push(@{ $insertlist{"$tag.which"} },$j);
+	}
+      }
+    }
+    $tagnum++;
+  }
+}
 
+sub description {
+  my ($token)=@_;
+  my $tagnum;
+  my $tag=$token->[1];
+  foreach my $namespace (reverse @Apache::lonxml::namespace) {
+    my $testtag=$namespace.'::'.$tag;
+    $tagnum=$insertlist{"$testtag.num"};
+    if (defined($tagnum)) { last; }
+  }
+  if (!defined ($tagnum)) { $tagnum=$Apache::lonxml::insertlist{"$tag.num"}; }
+  return $insertlist{$tagnum.'.description'};
+}
+
+# ----------------------------------------------------------------- whichuser
+# returns a list of $symb, $courseid, $domain, $name that is correct for
+# calls to lonnet functions for this setup.
+# - looks for form.grade_ parameters
+sub whichuser {
+  my ($symb,$courseid,$domain,$name);
+  if (defined($ENV{'form.grade_symb'})) {
+    my $tmp_courseid=$ENV{'form.grade_courseid'};
+    my $allowed=&Apache::lonnet::allowed('mgr',$tmp_courseid);
+    if ($allowed) {
+      $symb=$ENV{'form.grade_symb'};
+      $courseid=$ENV{'form.grade_courseid'};
+      $domain=$ENV{'form.grade_domain'};
+      $name=$ENV{'form.grade_username'};
+    }
+  } else {
+    $symb=&Apache::lonnet::symbread();
+    $courseid=$ENV{'request.course.id'};
+    $domain=$ENV{'user.domain'};
+    $name=$ENV{'user.name'};
+  }
+  return ($symb,$courseid,$domain,$name);
+}
+
+1;
+__END__
 
 


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