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Diff for /loncom/xml/lontexconvert.pm between versions 1.98.2.1 and 1.112.2.8

version 1.98.2.1, 2011/02/10 20:07:00 version 1.112.2.8, 2019/02/15 17:52:54
Line 50  use LONCAPA; Line 50  use LONCAPA;
 use URI::Escape;  use URI::Escape;
 use IO::Socket::INET;  use IO::Socket::INET;
   
   
   #
   # Table of substitutions to unicode characters.
   #
   
   my %unicode_harpoons = (
                           '\rightleftharpoons'  => 0x21cc,
                         );
   
   my %unicode_translations = (
   
   # Brackets - unicode for browsers/OS which support it.
   
       ''             => 0x23a1,
       ''             => 0x23a2,
       ''             => 0x23a3,
       ''             => 0x23a4,
       ''             => 0x23a5,
       ''             => 0x23a6,
   
   #  Parens - unicode for browsers/OS which support it
   
       ''              => 0x239b,
       ''              => 0x239c,
       ''              => 0x239d,
       ''              => 0x239e,
       ''              => 0x239f,
       ''              => 0x23a0,
   
   );
   
   my %ascii_8bit_translations = (
   
   # Brackets - pure 8-bit ascii ugliness for browsers/OS which can't handle unicode
   
       ''              => 0x5b,
       ''              => 0x5b,    # '['
       ''              => 0x5b,
       ''              => 0x5d,    # ']'
       ''              => 0x5d,
       ''              => 0x5d,
   
   # Parens - pure 8-bit ascii ugliness for browsers/OS which can't handle unicode
   
       ''              => 0x28,
       ''              => 0x28,      # '('
       ''              => 0x28,
       ''              => 0x29,
       ''              => 0x29,      # '('
       ''              => 0x29,
   
   );
   
   ##
   # Utility to convert elements of a string to unicode:
   #
   # @param input - Input string
   # @param pattern - Pattern to convert
   # @param unicode - Unicode to substitute for pattern.
   #
   # @return string - resulting string.
   # 
   sub unicode_subst {
       my ($input, $pattern, $unicode) = @_;
       
       my $char = pack('U', $unicode);
   
       $input =~ s/$pattern/$char/g;
   
       return $input;
   }
   
 # ====================================================================== Header  # ====================================================================== Header
   
 sub init_tth {  sub init_tth {
Line 106  sub convert_real { Line 178  sub convert_real {
     $xmlstring=~s/^\s*\<br clear\=\"all\"/\<br/s;      $xmlstring=~s/^\s*\<br clear\=\"all\"/\<br/s;
     $xmlstring=~s/^\s*//;      $xmlstring=~s/^\s*//;
     $xmlstring=~s/\s*$//;      $xmlstring=~s/\s*$//;
       &Apache::lonxml::end_alarm();
   
     #      #
     # \rightleftharpoons is not converted by tth but maps      # Several strings produced by tth require
     # reasonably well to &#8660;.  If we get many more of these,      # transliteration -> unicode equivalents to render reliably
     # we're going to need to have a translation sub.      # in browsers. %unicode_translations and %unicode_harpoons are tables of
     #      # string->substitution which we now apply. (%ascii_8bit_translations used
     my $lrharpoon = pack("U", 0x21cc);      # instead for Windows XP and mobile devices.
     $xmlstring=~s/\\rightleftharpoons/$lrharpoon/g;  
       my $use_ascii;
       if ($env{'browser.os'} eq 'win') {
           if (($env{'browser.osversion'}) && ($env{'browser.osversion'} < 6.0)) {
               $use_ascii = 1;
           }
       }
       if ($env{'browser.mobile'}) {
           $use_ascii = 1;
       }
   
       foreach my $pattern (keys(%unicode_translations)) {
    my $unicode = $unicode_translations{$pattern};
    if ($use_ascii) {
       $unicode = $ascii_8bit_translations{$pattern};
    }
    $xmlstring = &unicode_subst($xmlstring, $pattern, $unicode);
       }
   
       foreach my $pattern (keys(%unicode_harpoons)) {
           $xmlstring = &unicode_subst($xmlstring, $pattern, $unicode_harpoons{$pattern});
       }
   
     &Apache::lonxml::end_alarm();  
     return ($xmlstring,$errorstring);      return ($xmlstring,$errorstring);
 }  }
   
Line 165  sub clean_out_math_mode { Line 259  sub clean_out_math_mode {
   
 sub displaystyle {  sub displaystyle {
     my ($texstring)=@_;      my ($texstring)=@_;
     #has a $$ or \[ or \displaystyle in it, guessinng it's display mode      #has a $$ or \[ or \displaystyle or eqnarray in it, guessinng it's display mode
     if ($$texstring=~/[^\\]\$\$/ ||      if ($$texstring=~/[^\\]\$\$/ ||
  $$texstring=~/\\\[/ ||          $$texstring=~/\\\[/ ||
  $$texstring=~/\\displaystyle/) { return 1; }          $$texstring=~/\\displaystyle/ ||
           $$texstring=~/eqnarray/
          ) { return 1; }
     return 0;      return 0;
 }  }
   
 sub jsMath_converted {  sub MathJax_converted {
     my $texstring=shift;      my $texstring=shift;
     my $tag='span';      my ($tag,$startspan,$endspan);
     if (&displaystyle($texstring)) { $tag='div'; }      $tag='math/tex;';
       if (&displaystyle($texstring)) {
           $tag='math/tex; mode=display';
           $startspan='';
           $endspan='';
       } else {
           $startspan='<span style="display:inline-block;">';
           $endspan='</span>';
       }
     &clean_out_math_mode($texstring);      &clean_out_math_mode($texstring);
     return &jsMath_header().      return &MathJax_header().$startspan.
  '<'.$tag.' class="math">'.$$texstring.'</'.$tag.'>';        '<script type="'.$tag.'">'.$$texstring.'</script>'.$endspan;
 }  }
   
 {  {
     my @jsMath_sent_header;      #Relies heavily on the previous jsMath installation
     sub jsMath_reset {      my @MathJax_sent_header;
  undef(@jsMath_sent_header);      sub MathJax_reset {
     }          undef(@MathJax_sent_header);
     sub jsMath_push {      }
  push(@jsMath_sent_header,0);      sub MathJax_push {
     }          push(@MathJax_sent_header,0);
     sub jsMath_header {      }
  if (!@jsMath_sent_header) {      sub MathJax_header {
     &Apache::lonnet::logthis("mismatched calls of jsMath_header and jsMath_process");          if (!@MathJax_sent_header) {
     return '';              &Apache::lonnet::logthis("mismatched calls of MathJax_header and MathJax_process");
  }              return '';
  return '' if $jsMath_sent_header[-1];          }
  $jsMath_sent_header[-1]=1;          return '' if $MathJax_sent_header[-1];
  return          $MathJax_sent_header[-1]=1;
             '<script type="text/javascript">          return
                      function NoFontMessage () {}            '<script type="text/javascript" src="/adm/MathJax/MathJax.js?config=TeX-AMS-MML_HTMLorMML"></script>'."\n";
                      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 "\n".  
     '<script type="text/javascript">jsMath.Process()</script>'."\n";  
     }  
     sub jsMath_state {  
  my ($level) = @_;  
  return $jsMath_sent_header[$level];  
     }      }
 }  }
   
 sub tex_engine {  sub tex_engine {
     if (exists($env{'form.texengine'})) {      if (exists($env{'form.texengine'})) {
  if ($env{'form.texengine'} ne '') {   if ($env{'form.texengine'} ne '') {
               if (lc($env{'form.texengine'}) eq 'jsmath') {
                   return 'MathJax';
               }
             return $env{'form.texengine'};              return $env{'form.texengine'};
         }          }
     }          }    
     if ($env{'request.course.id'}      if ($env{'request.course.id'}
  && exists($env{'course.'.$env{'request.course.id'}.'.texengine'})) {   && exists($env{'course.'.$env{'request.course.id'}.'.texengine'})) {
           if (lc($env{'course.'.$env{'request.course.id'}.'.texengine'}) eq 'jsmath') {
               return 'MathJax';
           }
  return $env{'course.'.$env{'request.course.id'}.'.texengine'};   return $env{'course.'.$env{'request.course.id'}.'.texengine'};
     }      }
     if (exists($env{'environment.texengine'})) {      if (exists($env{'environment.texengine'})) {
           if (lc($env{'environment.texengine'}) eq 'jsmath') {
               return 'MathJax';
           }
  return $env{'environment.texengine'};   return $env{'environment.texengine'};
     }      }
       my $dom = $env{'request.role.domain'} || $env{'user.domain'};
       my %domdefaults = &Apache::lonnet::get_domain_defaults($dom);
       if ($domdefaults{'texengine'} ne '') {
           return $domdefaults{'texengine'};
       }
     return 'tth';      return 'tth';
 }  }
   
 sub init_math_support {  sub init_math_support {
     my ($inherit_jsmath) = @_;  
     &init_tth();      &init_tth();
     &Apache::lontexconvert::jsMath_push();      &Apache::lontexconvert::MathJax_push();
     if (lc(&tex_engine()) eq 'jsmath' ||      if (lc(&tex_engine()) eq 'mathjax') {
  ($inherit_jsmath && &jsMath_state(-2))) {          return &Apache::lontexconvert::MathJax_header();
  return &Apache::lontexconvert::jsMath_header();  
     }      }
     return;      return;
 }  }
Line 245  sub init_math_support { Line 348  sub init_math_support {
 sub mimetex_valign {  sub mimetex_valign {
     my ($esc_texstring)=@_;      my ($esc_texstring)=@_;
     my $valign = 0;      my $valign = 0;
     my $lonhost = $Apache::lonnet::perlvar{'lonHostID'};  
     my $hostname = &Apache::lonnet::hostname($lonhost);  
     my $path = '/cgi-bin/mimetex.cgi?'.$esc_texstring;      my $path = '/cgi-bin/mimetex.cgi?'.$esc_texstring;
     my $socket;      my $socket;
     &Apache::lonxml::start_alarm();      &Apache::lonxml::start_alarm();
     my $socket = IO::Socket::INET->new(PeerAddr => $hostname,      $socket = IO::Socket::INET->new(PeerAddr => 'localhost',
                                        PeerPort => 'http(80)',                                      PeerPort => 'http(80)',
                                        Proto    => 'tcp');                                      Proto    => 'tcp');
     if ($socket) {      if ($socket) {
         my $headreq = "HEAD $path HTTP/1.0\r\n\r\n";          my $headreq = "HEAD $path HTTP/1.0\r\n\r\n";
         print $socket $headreq;          print $socket $headreq;
Line 289  sub mimetex_converted { Line 390  sub mimetex_converted {
     my $valign = &mimetex_valign($esc_texstring);      my $valign = &mimetex_valign($esc_texstring);
     my $result='<img src="/cgi-bin/mimetex.cgi?'.$esc_texstring.'" style="vertical-align:'.$valign.'px" alt="'.$alt_string.'" />';      my $result='<img src="/cgi-bin/mimetex.cgi?'.$esc_texstring.'" style="vertical-align:'.$valign.'px" alt="'.$alt_string.'" />';
     if ($displaystyle) {      if ($displaystyle) {
  $result='<center>'.$result.'</center>';   $result='<div style="text-align:center">'.$result.'</div>';
     }      }
     return $result;      return $result;
 }  }
Line 300  sub converted { Line 401  sub converted {
     if ($mode =~ /tth/i) {      if ($mode =~ /tth/i) {
  return &tth_converted($string);   return &tth_converted($string);
     } elsif ($mode =~ /jsmath/i) {      } elsif ($mode =~ /jsmath/i) {
  return &jsMath_converted($string);   return &MathJax_converted($string);
       } elsif ($mode =~ /mathjax/i) {
           return &MathJax_converted($string);
     } elsif ($mode =~ /mimetex/i) {      } elsif ($mode =~ /mimetex/i) {
  return &mimetex_converted($string);   return &mimetex_converted($string);
     } elsif ($mode =~ /raw/i) {      } elsif ($mode =~ /raw/i) {
Line 313  sub converted { Line 416  sub converted {
   
 sub to_convert {  sub to_convert {
     my ($string) = @_;      my ($string) = @_;
       &init_tth();
     $string=~s/\<br\s*\/?\>/ /gs;      $string=~s/\<br\s*\/?\>/ /gs;
 #    $string=~s/\s/ /gs;  #    $string=~s/\s/ /gs;
     $string=&HTML::Entities::decode($string);      $string=&HTML::Entities::decode($string);
Line 321  sub to_convert { Line 425  sub to_convert {
   
 sub smiley {  sub smiley {
     my $expression=shift;      my $expression=shift;
     if ($env{'browser.imagesuppress'} eq 'on') { return $expression; }      my %smileys=(
     my %smileys=('\:\-\)' => 'smiley',      '\:\-*\)' => 'face-smile.png',
  '8\-\)'  => 'coolsmile',   '8\-\)'  => 'face-cool.png',
  '8\-(I|\|)'   => 'coolindiff',   '8\-(I|\|)'   => 'face-glasses.png',
  ':\-(I|\|)'   => 'neutral',   '\:\-(I|\|)'   => 'face-plain.png',
  '\:\-(o|O|\(\))' => 'shocked',   '\:\-(o|O|\(\))' => 'face-surprise.png',
  ':\-\('  => 'frowny',   ':\-\('  => 'face-sad.png',
  '\;\-\)' => 'wink',   '\;\-\)' => 'face-wink.png',
  '\:\-P'  => 'baeh',   '\:\-(P|p)'  => 'face-raspberry.png',
  '\:\-(\\\|\\/)' => 'hrrm',   '\:\-(\\\|\\/)' => 'face-uncertain.png',
  '\:\-D'  => 'bigsmile',   '\:\-D'  => 'face-smile-big.png',
  '\:\-C'  => 'angry',   '\:\-(C|\@)'  => 'face-angry.png',
  '\:(\'|\`)\-\(' => 'cry',   '\:(\'|\`)\-*\(' => 'face-crying.png',
  '\:\-(X|\#)' => 'lipsrsealed',   '\:\-(X|x|\#)' => 'face-quiet.png',
  '\:\-S' => 'huh');   '\:\-(s|S)' => 'face-uncertain.png',
    '\:\-\$' => 'face-embarrassed.png',
    '\:\-\*' => 'face-kiss.png',
    '\+O\(' => 'face-sick.png',
    '(\&lt\;3|\(heart\))' => 'heart.png',
    '\(rose\)' => 'rose.png',
    '\(pizza\)' => 'food-pizza.png',
    '\(cake\)' => 'food-cake.png',
    '\(ninja\)' => 'face-ninja.png',
    '\(pirate\)' => 'face-pirate.png',
    '\((agree|yes)\)' => 'opinion-agree.png',
    '\((disagree|nay)\)' => 'opinion-disagree.png',
    '(o|O)\-\)' => 'face-angel.png',
    );
     my $iconpath=$Apache::lonnet::perlvar{'lonIconsURL'};      my $iconpath=$Apache::lonnet::perlvar{'lonIconsURL'};
     foreach my $smiley (keys(%smileys)) {      foreach my $smiley (keys(%smileys)) {
  $expression=~s/$smiley/\<img src="$iconpath\/$smileys{$smiley}.gif" \/\>/gs;    $expression=~s/$smiley/\<img src="$iconpath\/$smileys{$smiley}" \/\>/gs; 
     }      }
     return $expression;      return $expression;
 }  }
Line 346  sub smiley { Line 463  sub smiley {
 sub msgtexconverted {  sub msgtexconverted {
     my ($message,$email) = @_;      my ($message,$email) = @_;
     $errorstring='';      $errorstring='';
     &init_tth();  
     my $outmessage='';      my $outmessage='';
     my $tex=0;      my $tex=0;
     foreach my $fragment (split(/(?:\&lt\;|\<)\/*m\s*(?:\&gt\;|\>)/i,$message)) {      foreach my $fragment (split(/(?:\&lt\;|\<)\/*m\s*(?:\&gt\;|\>)/i,$message)) {
Line 367  sub msgtexconverted { Line 483  sub msgtexconverted {
     foreach my $fragment (split(/(?:\&lt\;|\<)\/*algebra\s*(?:\&gt\;|\>)/i,      foreach my $fragment (split(/(?:\&lt\;|\<)\/*algebra\s*(?:\&gt\;|\>)/i,
  $message)) {   $message)) {
  if ($tex) {   if ($tex) {
           my $algebra = &algebra($fragment, 'web', undef, undef, undef, 'tth');
     if ($email) {      if ($email) {
  $outmessage.='</pre><tt>'.&algebra($fragment,'web').'</tt><pre>';   $outmessage.='</pre><tt>'.$algebra.'</tt><pre>';
  $tex=0;   $tex=0;
     } else {      } else {
  $outmessage.=&algebra($fragment,'web');   $outmessage.=$algebra;
  $tex=0;   $tex=0;
     }      }
  } else {   } else {
             $outmessage.=$fragment;          $outmessage.=$fragment;
     $tex=1;      $tex=1;
  }   }
     }      }
Line 388  sub msgtexconverted { Line 505  sub msgtexconverted {
   
 sub algebra {  sub algebra {
     use AlgParser;      use AlgParser;
       my ($string,$target,$style,$parstack,$safeeval,$tth)=@_;
     my ($string,$target,$style,$parstack,$safeeval)=@_;  
     my $parser = new AlgParserWithImplicitExpand;      my $parser = new AlgParserWithImplicitExpand;
       if ($tth eq 'tth') {&init_tth();}
     $string=&prepare_algebra($string);      $string=&prepare_algebra($string);
     my $ret = $parser->parse($string);      my $ret = $parser->parse($string);
     my $result='['.&mt('Algebra unconverted due to previous errors').']';      my $result='['.&mt('Algebra unconverted due to previous errors').']';
Line 433  sub postprocess_algebra { Line 550  sub postprocess_algebra {
     # $string =~s/\\fun/ /g;      # $string =~s/\\fun/ /g;
   
     # sqrt(3,4) means the 4 root of 3      # sqrt(3,4) means the 4 root of 3
     $string =~s/\\sqrt{([^,]+),([^\}]+)}/\\sqrt[$2]{$1}/gs;      $string =~s/\\sqrt\{([^,]+),([^\}]+)}/\\sqrt[$2]{$1}/gs;
   
     # log(3,4) means the log base 4 of 3      # log(3,4) means the log base 4 of 3
     $string =~s/\\log\\left\((.+?),(.+?)\\right\)/\\log_{$2}\\left($1\\right)/gs;      $string =~s/\\log\\left\((.+?),(.+?)\\right\)/\\log_{$2}\\left($1\\right)/gs;
Line 451  sub postprocess_algebra { Line 568  sub postprocess_algebra {
     $string =~s/\\lim\\left\((.+?),(.+?),(.+?)\\right\)/\\lim_{$2\\to $3}$1/gs;      $string =~s/\\lim\\left\((.+?),(.+?),(.+?)\\right\)/\\lim_{$2\\to $3}$1/gs;
     return $string;      return $string;
 }  }
   
   
 1;  1;
 __END__  __END__
   
Line 493  Header Line 612  Header
 =item displaystyle()  =item displaystyle()
   
   
 =item jsMath_converted()  =item MathJax_converted()
   
   
 =item tex_engine()  =item tex_engine()
   
   
 =item init_math_support()  =item init_math_support()
   
 =item mimetex_valign()  =item mimetex_valign()
   
  Makes a HEAD call to /cgi-bin/mimetex.cgi via IO:: to retrieve the   Makes a HEAD call to /cgi-bin/mimetex.cgi via IO:: to retrieve the 
  vertical alignment, before the subsequent call to mimetex_converted()   vertical alignment, before the subsequent call to mimetex_converted()
  which generates the <img> tag and the corresponding image.   which generates the <img> tag and the corresponding image.
   
  Input: 1.  $esc_texstring (escaped TeX to be rendered by mimetex).   Input: 1.  $esc_texstring (escaped TeX to be rendered by mimetex).
  Output: 1. $valign - number of pixels: positive or negative integer   Output: 1. $valign - number of pixels: positive or negative integer 
             which will be included in <img> tag for mimetex image to              which will be included in <img> tag for mimetex image to
             support vertical alignment of image within a line of text.              support vertical alignment of image within a line of text.
   
  If a server is running SSL, and Apache rewrite rules are in place   If a server is running SSL, and Apache rewrite rules are in place 
  to rewrite requests for http to https, modification will most likely   to rewrite requests for http to https, modification will most likely 
  be needed for pass through for HEAD requests for /cgi-bin/mimetex.cgi.   be needed for pass through for HEAD requests for /cgi-bin/mimetex.cgi. 
   
  Example rewrite rules which rewrite all http traffic to https,   Example rewrite rules which rewrite all http traffic to https, 
  except HEAD requests for /cgi-bin/mimetex.cgi are:   except HEAD requests for /cgi-bin/mimetex.cgi are:
   
  <IfModule mod_rewrite.c>   <IfModule mod_rewrite.c>
Line 525  Header Line 642  Header
   
      RewriteCond %{HTTPS} off       RewriteCond %{HTTPS} off
      RewriteCond %{HTTP:Host} (.*)       RewriteCond %{HTTP:Host} (.*)
      RewriteCond %{REQUEST_METHOD} !HEAD       RewriteCond %{REQUEST_METHOD} !HEAD 
      RewriteRule ^/(.*) https://%1/$1 [R=301,L]       RewriteRule ^/(.*) https://%1/$1 [R=301,L]
   
      RewriteCond %{HTTPS} off       RewriteCond %{HTTPS} off
Removed from v.1.98.2.1  
changed lines
  Added in v.1.112.2.8

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