--- loncom/xml/lontexconvert.pm 2001/11/29 19:03:58 1.4
+++ loncom/xml/lontexconvert.pm 2005/02/24 09:28:54 1.51
@@ -1,7 +1,7 @@
# The LearningOnline Network with CAPA
# TeX Conversion Module
#
-# $Id: lontexconvert.pm,v 1.4 2001/11/29 19:03:58 www Exp $
+# $Id: lontexconvert.pm,v 1.51 2005/02/24 09:28:54 albertel Exp $
#
# Copyright Michigan State University Board of Trustees
#
@@ -36,51 +36,108 @@
# The C source of the Code may not be distributed by the Licensee
# to any other parties under any circumstances.
#
-# 05/29/00,05/30,10/11,10/20 Gerd Kortemeyer
-# 05/03/2001 Scott Harrison
-# 5/4 Gerd Kortemeyer
package Apache::lontexconvert;
use strict;
-use tth;
+use tth();
use vars qw($errorstring);
-use Apache::lonmsg;
-use Apache::lonxml;
+use Apache();
+use Apache::lonmsg();
+use Apache::lonxml();
+use Apache::lonmenu();
+use Apache::lonlocal;
# ====================================================================== Header
+sub init_tth {
+ my $options=$ENV{'course.'.$ENV{'request.course.id'}.'.tthoptions'};
+ if ($ENV{'browser.mathml'}) {
+ &tth::ttminit();
+ if ($ENV{'browser.unicode'}) {
+ &tth::ttmoptions('-L -u1 '.$options);
+ } else {
+ &tth::ttmoptions('-L -u0 '.$options);
+ }
+ } else {
+ &tth::tthinit();
+ if ($ENV{'browser.unicode'}) {
+ &tth::tthoptions('-L -u1 '.$options);
+ } else {
+ &tth::tthoptions('-L -u0 '.$options);
+ }
+ }
+}
+
sub header {
- $errorstring='';
- my $time=time;
- if ($ENV{'browser.mathml'}) {
- &tth::ttminit();
- } else {
- &tth::tthinit();
- }
- return &Apache::lonxml::xmlbegin().
- &Apache::lonxml::fontsettings().
- "\n<head>\n".
- &Apache::lonxml::registerurl().
- "\n</head>\n";
+ $errorstring='';
+ my $time=time;
+ &init_tth();
+ return &Apache::lonxml::xmlbegin().
+ "\n<head>\n".
+ &Apache::lonxml::fontsettings().
+ &Apache::lonmenu::registerurl(undef,'tex').
+ "\n</head>\n";
}
# ================================================================== Conversion
+$Apache::lontexconvert::messedup=0;
+
+# we need this routine because &converted can get called from inside
+# of the safespace (through &xmlparse('<m>stuff</m>') which doesn't
+# allow the opcode for alarm, so we need to compile this before we get
+# into the safe space since opcode checks only occur at compile time
+sub convert_real {
+ my ($texstring)=@_;
+ my ($xmlstring,$errorstring);
+ local $SIG{SEGV}=sub { $Apache::lontexconvert::messedup=1; die; };
+ local $SIG{ALRM}=sub {
+ &Apache::lonnet::logthis("ALRM");
+ $xmlstring='['.&mt("TeX unconverted due to errors").']';
+ $Apache::lontexconvert::messedup=1;
+ die &mt("TeX unconverted due to errors");
+ };
+ alarm($Apache::lonnet::perlvar{'lonScriptTimeout'});
+ if ($ENV{'browser.mathml'}) {
+ $xmlstring=&tth::ttm($$texstring);
+ $xmlstring=~s/\<math\>/\<math xmlns=\"\&mathns\;\"\>/g;
+ $xmlstring=~s/\<br\>/\<br\/\>/g;
+ $xmlstring=~s/\<p\>/\<p\>\<\/p\>/g;
+ $errorstring.=&tth::ttmerror();
+ } else {
+ $xmlstring=&tth::tth($$texstring);
+ $errorstring.=&tth::ttherror();
+ $xmlstring=~s-</font(\s*)>-</font>-g;
+ }
+ $xmlstring=~s/^\s*\<br clear\=\"all\"/\<br/s;
+ $xmlstring=~s/^\s*//;
+ $xmlstring=~s/\s*$//;
+ alarm(0);
+ return ($xmlstring,$errorstring);
+}
+
sub converted {
my $texstring=shift;
- my $xmlstring;
- if ($ENV{'browser.mathml'}) {
- $xmlstring=&tth::ttm($$texstring);
- $xmlstring=~s/\<math\>/\<math xmlns=\"\&mathns\;\"\>/g;
- $xmlstring=~s/\<br\>/\<br\/\>/g;
- $xmlstring=~s/\<p\>/\<p\>\<\/p\>/g;
- $errorstring.=&tth::ttmerror();
- } else {
- $xmlstring=&tth::tth($$texstring);
- $errorstring.=&tth::ttherror();
- }
- return $xmlstring;
+ my $xmlstring='['.&mt('UNDISPLAYABLE').']';
+ if ($Apache::lontexconvert::messedup) {
+ return '['.&mt('TeX unconverted due to previous errors').']';
+ }
+ eval(<<'ENDCONV');
+ ($xmlstring,$errorstring)=&convert_real($texstring)
+ENDCONV
+ if ($@) {
+ $errorstring.=&mt("Evaluation Error: ").$@;
+ $Apache::lontexconvert::messedup=1;
+ }
+ if ($Apache::lontexconvert::messedup || &tth::tthmessedup() ||
+ $errorstring) {
+ &Apache::lonnet::logthis("Trying to kill myself");
+ $Apache::lontexconvert::messedup=1;
+ my $request=Apache->request();
+ $request->child_terminate();
+ }
+ return $xmlstring;
}
# ====================================================================== Footer
@@ -97,6 +154,113 @@ sub footer {
return $xmlstring;
}
+# ------------------------------------------------------------ Message display
+
+sub to_convert {
+ my ($string) = @_;
+ $string=~s/\<br\s*\/?\>/ /gs;
+# $string=~s/\s/ /gs;
+ $string=&HTML::Entities::decode($string);
+ return &converted(\$string);
+}
+
+sub smiley {
+ my $expression=shift;
+ if ($ENV{'browser.imagesuppress'} eq 'on') { return $expression; }
+ my %smileys=('\:\-\)' => 'smiley',
+ '8\-\)' => 'coolsmile',
+ '8\-(I|\|)' => 'coolindiff',
+ ':\-(I|\|)' => 'neutral',
+ '\:\-(o|O|\(\))' => 'shocked',
+ ':\-\(' => 'frowny',
+ '\;\-\)' => 'wink',
+ '\:\-P' => 'baeh',
+ '\:\-(\\\|\\/)' => 'hrrm',
+ '\:\-D' => 'bigsmile',
+ '\:\-C' => 'angry',
+ '\:(\'|\`)\-\(' => 'cry',
+ '\:\-(X|\#)' => 'lipsrsealed',
+ '\:\-S' => 'huh');
+ my $iconpath=$Apache::lonnet::perlvar{'lonIconsURL'};
+ foreach (keys %smileys) {
+ $expression=~s/$_/\<img src="$iconpath\/$smileys{$_}.gif" \/\>/gs;
+ }
+ return $expression;
+}
+
+sub msgtexconverted {
+ my ($message,$email) = @_;
+ $errorstring='';
+ &init_tth();
+ my $outmessage='';
+ my $tex=0;
+ foreach (split(/(?:\<\;|\<)\/*m\s*(?:\>\;|\>)/i,$message)) {
+ if ($tex) {
+ if ($email) {
+ $outmessage.='</pre><tt>'.&to_convert($_).'</tt><pre>'; $tex=0;
+ } else {
+ $outmessage.=&to_convert($_); $tex=0;
+ }
+ } else {
+ $outmessage.=&smiley($_); $tex=1;
+ }
+ }
+ if (wantarray) {
+ return ($outmessage,$errorstring);
+ } else {
+ return $outmessage.$errorstring;
+ }
+}
+
+sub algebra {
+ use AlgParser;
+
+ my ($string,$target)=@_;
+ my $parser = new AlgParserWithImplicitExpand;
+ $string=&prepare_algebra($string);
+ my $ret = $parser->parse($string);
+ my $result='['.&mt('Algebra unconverted due to previous errors').']';
+ if ( ref($ret) ) {
+ #$parser->tostring();
+ $parser->normalize();
+ my $latex=$parser->tolatex();
+ $latex=&postprocess_algebra($latex);
+ $latex='$'.$latex.'$';
+ if ($target eq 'web' || $target eq 'analyze') {
+ $result = &converted(\$latex);
+ } else {
+ $result = $latex;
+ }
+ } else {
+ &Apache::lonxml::error($parser->{'htmlerror'});
+ }
+}
+
+sub prepare_algebra {
+ my ($string)=@_;
+
+ # makes the decision about what is a minus sign easier supposedly
+ $string =~ s/([\=\>\<\%\!\#] *)-/$1 zeroplace -/g;
+
+ return $string;
+}
+
+sub postprocess_algebra {
+ my ($string)=@_;
+
+ # moodle had these and I don't know why, ignoring them for now
+ # $string =~s/\\fun/ /g;
+
+ # sqrt(3,4) -> \sqrt\let{3,4\right}, which is annoying
+ $string =~s/\\left\{/\{/g;
+ $string =~s/\\right\}/\}/g;
+
+ # sqrt(3,4) means the 4 root of 3
+ $string =~s/\\sqrt{([^,]+),([^}]+)}/\\sqrt[$2]{$1}/gs;
+
+ &Apache::lonnet::logthis($string);
+ return $string;
+}
1;
__END__