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Diff for /loncom/xml/lontexconvert.pm between versions 1.13 and 1.66

version 1.13, 2002/11/09 22:05:33 version 1.66, 2005/06/09 02:17:11
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();
 use Apache::lonxml;  use Apache::lonmsg();
   use Apache::lonxml();
   use Apache::lonmenu();
   use Apache::lonlocal;
   use Apache::lonnet;
   
 # ====================================================================== Header  # ====================================================================== 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 {  sub header {
   $errorstring='';      $errorstring='';
   my $time=time;      my $time=time;
   if ($ENV{'browser.mathml'}) {      &init_tth();
       &tth::ttminit();      return &Apache::lonxml::xmlbegin().
       if ($ENV{'browser.unicode'}) {   "\n<head>\n".
   &tth::ttmoptions('-L -u1');   &Apache::lonxml::fontsettings().
       } else {   &Apache::lonmenu::registerurl(undef,'tex').
   &tth::ttmoptions('-L -u0');   "\n</head>\n";
       }  
   } else {  
       &tth::tthinit();  
       if ($ENV{'browser.unicode'}) {  
   &tth::tthoptions('-L -u1');  
       } else {  
   &tth::tthoptions('-L -u0');  
       }  
   }  
   return &Apache::lonxml::xmlbegin().  
          &Apache::lonxml::fontsettings().  
          "\n<head>\n".  
          &Apache::lonxml::registerurl(undef,'tex').  
  "\n</head>\n";  
 }  }
   
 # ================================================================== Conversion  # ================================================================== Conversion
   
 sub converted {  $Apache::lontexconvert::messedup=0;
   my $texstring=shift;  
   my $xmlstring='[UNDISPLAYABLE]';  # we need this routine because &converted can get called from inside
   eval(<<'ENDCONV');  # 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
     local $SIG{SEGV}=sub { die; };  # into the safe space since opcode checks only occur at compile time
     if ($ENV{'browser.mathml'}) {  sub convert_real {
       $xmlstring=&tth::ttm($$texstring);      my ($texstring)=@_;
       $xmlstring=~s/\<math\>/\<math xmlns=\"\&mathns\;\"\>/g;      my ($xmlstring,$errorstring);
       $xmlstring=~s/\<br\>/\<br\/\>/g;      local $SIG{SEGV}=sub { $Apache::lontexconvert::messedup=1; die; };
       $xmlstring=~s/\<p\>/\<p\>\<\/p\>/g;      local $SIG{ALRM}=sub { 
       $errorstring.=&tth::ttmerror();   &Apache::lonnet::logthis("ALRM");
    $xmlstring='['.&mt("TeX unconverted due to errors").']';
    $Apache::lontexconvert::messedup=1;
    die &mt("TeX unconverted due to errors");
       };
       &Apache::lonxml::start_alarm();
       if ($env{'browser.mathml'}) {
    $xmlstring=&tth::ttm($$texstring);
    $xmlstring=~s/\<math\>/\<math xmlns=\"\&mathns\;\"\>/g;
    $xmlstring=~s/\<br\>/\<br\/\>/g;
    $xmlstring=~s/\<p\>/\<p\>\<\/p\>/g;
    $errorstring.=&tth::ttmerror();
     } else {      } else {
       $xmlstring=&tth::tth($$texstring);   $xmlstring=&tth::tth($$texstring);
       $errorstring.=&tth::ttherror();   $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  ENDCONV
   return $xmlstring;      if ($@) {
    $errorstring.=&mt("Evaluation Error: ").$@;
    $Apache::lontexconvert::messedup=1;
       }
       if ($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;
   }
   
   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 $tag='span';
       if (&displaystyle($texstring)) { $tag='div'; }
       &clean_out_math_mode($texstring);
       return '<'.$tag.' class="math">'.$$texstring.'</'.$tag.'>';
   }
   
   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?'.&Apache::lonnet::escape($$texstring).'" />';
       if ($displaystyle) {
    $result='<center>'.$result.'</center>';
       }
       return $result;
   }
   
   sub converted {
       if ($env{'environment.texengine'} eq 'tth') {
    return &tth_converted;
       } elsif ($env{'environment.texengine'} eq 'jsMath') {
    return &jsMath_converted;
       } elsif ($env{'environment.texengine'} eq 'mimetex') {
    return &mimetex_converted;
       }
       return &tth_converted;
 }  }
   
 # ====================================================================== Footer  # ====================================================================== Footer
   
 sub footer {  sub footer {
   my $xmlstring='';    my $xmlstring='';
   if ($ENV{'request.state'} eq 'construct') {    if ($env{'request.state'} eq 'construct') {
       $xmlstring.='<address>'.$errorstring.'</address>';        $xmlstring.='<address>'.$errorstring.'</address>';
   } else {    } else {
       &Apache::lonmsg::author_res_msg($ENV{'request.filename'},$errorstring);        &Apache::lonmsg::author_res_msg($env{'request.filename'},$errorstring);
   }    }
 # -------------------------------------------------------------------- End Body  # -------------------------------------------------------------------- End Body
   $xmlstring.=&Apache::lonxml::xmlend();    $xmlstring.=&Apache::lonxml::xmlend();
Line 116  sub footer { Line 213  sub footer {
   
 sub to_convert {  sub to_convert {
     my ($string) = @_;      my ($string) = @_;
     $string=~s/\<br\s*\/?\>/ /g;      $string=~s/\<br\s*\/?\>/ /gs;
   #    $string=~s/\s/ /gs;
       $string=&HTML::Entities::decode($string);
     return &converted(\$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 {  sub msgtexconverted {
     my $message=shift;      my ($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;
   
     #FIXME this crap needs to go but right now the -L option might be      my ($string,$target,$style)=@_;
     #ignored if this isn;t the first time the tth engine is used      my $parser = new AlgParserWithImplicitExpand;
     #thus the \\document class crap, it makes sure we init the LaTeX stuff      $string=&prepare_algebra($string);
     if ($ENV{'browser.mathml'}) {      my $ret = $parser->parse($string);
       &tth::ttminit();      my $result='['.&mt('Algebra unconverted due to previous errors').']';
       &tth::ttmoptions("-L");      if ( ref($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 = $latex;
    }
     } else {      } else {
       &tth::tthinit();   &Apache::lonxml::error($parser->{'htmlerror'});
       &tth::tthoptions("-L");  
     }      }
     $message=~s/(\$\$.+?\$\$)/&to_convert("\\documentclass{article}".$1)/ge;  
     $message=~s/(\$.+?\$)/&to_convert("\\documentclass{article}".$1)/ge;  
     $message=~s/(\\\(.+?\\\))/&to_convert("\\documentclass{article}".$1)/ge;  
     $message=~s/(\\\[.+?\\\])/&to_convert("\\documentclass{article}".$1)/ge;  
     return $message.$errorstring;  
 }  }
   
   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;
   
       # remove the extra () in the denominator of a \frac
       $string =~s/\\frac{(.+?)}{\\left\((.+?)\\right\)}/\\frac{$1}{$2}/gs;
       
       # 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.1.13  
changed lines
  Added in v.1.66

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