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Diff for /loncom/xml/lontexconvert.pm between versions 1.5 and 1.78

version 1.5, 2002/03/06 20:27:00 version 1.78, 2006/09/07 21:51:16
Line 36 Line 36
 # The C source of the Code may not be distributed by the Licensee  # The C source of the Code may not be distributed by the Licensee
 # to any other parties under any circumstances.  # 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;  package Apache::lontexconvert;
   
 use strict;  use strict;
 use tth;  use tth();
 use vars qw($errorstring);  use vars qw($errorstring);
 use Apache::lonmsg;  #use Apache::lonxml();
 use Apache::lonxml;  use Apache::lonlocal;
   use Apache::lonnet;
   use lib '/home/httpd/lib/perl/';
   use LONCAPA;
    
   
 # ====================================================================== Header  # ====================================================================== Header
   
 sub header {  sub init_tth {
   $errorstring='';      my $options=$env{'course.'.$env{'request.course.id'}.'.tthoptions'};
   my $time=time;      if ($options =~ /\S/) {
   if ($ENV{'browser.mathml'}) {   $options = ' '.$options;
       &tth::ttminit();      } else {
   } else {   undef($options);
       &tth::tthinit();      }
   }      if ($env{'browser.mathml'}) {
   return &Apache::lonxml::xmlbegin().   &tth::ttminit();
          &Apache::lonxml::fontsettings().   if ($env{'browser.unicode'}) {
          "\n<head>\n".      &tth::ttmoptions('-L -u1'.$options);
          &Apache::lonxml::registerurl(undef,'tex').   } else {
  "\n</head>\n";      &tth::ttmoptions('-L -u0'.$options);
    }
       } else {
    &tth::tthinit();
    if ($env{'browser.unicode'}) {
       &tth::tthoptions('-L -u1'.$options);
    } else {
       &tth::tthoptions('-L -u0'.$options);
    }
       }
 }  }
   
 # ================================================================== Conversion  # ================================================================== Conversion
   
 sub converted {  $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").']';
    $Apache::lontexconvert::messedup=1;
    die &mt("TeX unconverted due to errors");
       };
       &Apache::lonxml::start_alarm();
       if ($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*//;
       $xmlstring=~s/\s*$//;
       &Apache::lonxml::end_alarm();
       return ($xmlstring,$errorstring);
   }
   
   sub tth_converted {
       my $texstring=shift;
       my $xmlstring='['.&mt('UNDISPLAYABLE').']';
       if ($Apache::lontexconvert::messedup) {
    return '['.&mt('TeX unconverted due to previous errors').']';
       }
       $$texstring ='\\documentstyle{article}'.$$texstring;
   
       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");
    $Apache::lontexconvert::messedup=1;
    if (ref($Apache::lonxml::request)) {
       $Apache::lonxml::request->child_terminate();
    } else {
       my $request;
       eval { $request=Apache->request; };
       if (!$request) {
    eval { $request=Apache2::RequestUtil->request; };
       }
       if ($request) {
    $request->child_terminate();
       } else {
    &Apache::lonnet::logthis("Unable to find a request to do child_terminate on");
       }
    }
       }
       return $xmlstring;
   }
   
   sub clean_out_math_mode {
       my ($texstring)=@_;
       $$texstring=~s/(?!\\)\$//g;
       $$texstring=~s/\\[\)\(\]\[]//g;
       $$texstring=~s/\\ensuremath//g;
       return '';
   }
   
   sub displaystyle {
       my ($texstring)=@_;
       #has a $$ or \[ or \displaystyle in it, guessinng it's display mode
       if ($$texstring=~/[^\\]\$\$/ ||
    $$texstring=~/\\\[/ ||
    $$texstring=~/\\displaystyle/) { return 1; }
       return 0;
   }
   
   sub jsMath_converted {
     my $texstring=shift;      my $texstring=shift;
     my $xmlstring;      my $tag='span';
     if ($ENV{'browser.mathml'}) {      if (&displaystyle($texstring)) { $tag='div'; }
       $xmlstring=&tth::ttm($$texstring);      &clean_out_math_mode($texstring);
       $xmlstring=~s/\<math\>/\<math xmlns=\"\&mathns\;\"\>/g;      return &jsMath_header().
       $xmlstring=~s/\<br\>/\<br\/\>/g;   '<'.$tag.' class="math">'.$$texstring.'</'.$tag.'>';
       $xmlstring=~s/\<p\>/\<p\>\<\/p\>/g;  
       $errorstring.=&tth::ttmerror();  
   } else {  
       $xmlstring=&tth::tth($$texstring);  
       $errorstring.=&tth::ttherror();  
   }  
   return $xmlstring;  
 }  
   
 # ====================================================================== Footer  
   
 sub footer {  
   my $xmlstring='';  
   if ($ENV{'request.state'} eq 'construct') {  
       $xmlstring.='<address>'.$errorstring.'</address>';  
   } else {  
       &Apache::lonmsg::author_res_msg($ENV{'request.filename'},$errorstring);  
   }  
 # -------------------------------------------------------------------- End Body  
   $xmlstring.=&Apache::lonxml::xmlend();  
   return $xmlstring;  
 }  }
   
   {
       my @jsMath_sent_header;
       sub jsMath_reset {
    undef(@jsMath_sent_header);
       }
       sub jsMath_push {
    push(@jsMath_sent_header,0);
       }
       sub jsMath_header {
    return '' if $jsMath_sent_header[-1];
    $jsMath_sent_header[-1]=1;
    return
               '<script type="text/javascript">
                        function NoFontMessage () {}
                        jsMath = {Parser: {prototype: {environments: {\'eqnarray*\' :[\'Array\',null,null,\'rcl\',[5/18,5/18],3,\'D\']}}}};
                      </script>'."\n".
       '<script type="text/javascript" src="/adm/jsMath/jsMath.js"></script>'."\n";
       }
       sub jsMath_process {
    my $state = pop(@jsMath_sent_header);
    return '' if !$state;
    return '<script type="text/javascript">jsMath.Process()</script>';
       }
   }
   
   sub init_math_support {
       &init_tth();
       &Apache::lontexconvert::jsMath_push();
       if ($env{'environment.texengine'} eq 'jsMath' ||
    $env{'form.texengine'}        eq 'jsMath' ) {
    return &Apache::lontexconvert::jsMath_header();
       }
       return;
   }
   
   sub mimetex_converted {
       my $texstring=shift;
       my $displaystyle=&displaystyle($texstring);
   
       &clean_out_math_mode($texstring);
   
       if ($displaystyle) {
    $$texstring='\\displaystyle \\Large '.$$texstring;
       }
       my $result='<img src="/cgi-bin/mimetex.cgi?'.&escape($$texstring).'" />';
       if ($displaystyle) {
    $result='<center>'.$result.'</center>';
       }
       return $result;
   }
   
   sub converted {
       my ($string,$mode)=@_;
       if ($mode eq '') { $mode=$env{'environment.texengine'}; }
       if ($mode =~ /tth/i) {
    return &tth_converted($string);
       } elsif ($mode =~ /jsmath/i) {
    return &jsMath_converted($string);
       } elsif ($mode =~ /mimetex/i) {
    return &mimetex_converted($string);
       }
       return &tth_converted($string);
   }
   
   # ------------------------------------------------------------ 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 $tex=0;
       foreach (split(/(?:\&lt\;|\<)\/*m\s*(?:\&gt\;|\>)/i,$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;
    }
       }
       $message=$outmessage; $outmessage=''; $tex=0;
       foreach (split(/(?:\&lt\;|\<)\/*algebra\s*(?:\&gt\;|\>)/i,$message)) {
    if ($tex) {
       if ($email) {
    $outmessage.='</pre><tt>'.&algebra($_,'web').'</tt><pre>'; $tex=0;
       } else {
    $outmessage.=&algebra($_,'web'); $tex=0;
       }
    } else {
               $outmessage.=$_; $tex=1;
    }
       }
       if (wantarray) {
    return ($outmessage,$errorstring);
       } else {
    return $outmessage.$errorstring;
       }
   }
   
   sub algebra {
       use AlgParser;
   
       my ($string,$target,$style)=@_;
       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);
    if ($style eq 'display') {
       $latex='$$'.$latex.'$$x';
    } else {
       # style is 'inline'
       $latex='\\ensuremath{'.$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) means the 4 root of 3
       $string =~s/\\sqrt{([^,]+),([^\}]+)}/\\sqrt[$2]{$1}/gs;
   
       # log(3,4) means the log base 4 of 3
       $string =~s/\\log\\left\((.+?),(.+?)\\right\)/\\log_{$2}\\left($1\\right)/gs;
   
       # log(3,4) means the log base 4 of 3
       $string =~s/\\((?:sin|cos|tan|sec|csc|cot)(?:h)?)\\left\((.+?),(.+?)\\right\)/\\$1^{$3}\\left($2\\right)/gs;
   
       # int(3,a,b) integral from a to b of 3
       $string =~s/\\int\\left\((.+?),(.+?),(.+?)\\right\)/\\int_{$2}^{$3}\\left($1\\right)/gs;
   
       # int( ... dx) -> ...
       $string =~s/\\int\\left\((.+?)d[a-z]\\right\)/$1/gs;
   
       # 
       $string =~s/\\lim\\left\((.+?),(.+?),(.+?)\\right\)/\\lim_{$2\\to $3}$1/gs;
       return $string;
   }
 1;  1;
 __END__  __END__
   
Removed from v.1.5  
changed lines
  Added in v.1.78

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