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Diff for /loncom/xml/lontexconvert.pm between versions 1.44 and 1.58

version 1.44, 2005/02/24 01:21:50 version 1.58, 2005/02/24 10:09:32
Line 213  sub msgtexconverted { Line 213  sub msgtexconverted {
 }  }
   
 sub algebra {  sub algebra {
     my ($string,$target)=@_;      use AlgParser;
   
       my ($string,$target,$style)=@_;
     my $parser = new AlgParserWithImplicitExpand;      my $parser = new AlgParserWithImplicitExpand;
       $string=&prepare_algebra($string);
     my $ret = $parser->parse($string);      my $ret = $parser->parse($string);
     my $result='['.&mt('Algebra unconverted due to previous errors').']';      my $result='['.&mt('Algebra unconverted due to previous errors').']';
     if ( ref($ret) ) {      if ( ref($ret) ) {
  $parser->tostring();   #$parser->tostring();
  $parser->normalize();   $parser->normalize();
  my $latex=$parser->tolatex();   my $latex=$parser->tolatex();
  $latex='$$'.$latex.'$$';   $latex=&postprocess_algebra($latex);
    if ($style eq 'display') {
       $latex='$$'.$latex.'$$x';
    } else {
       $latex='\\ensuremath{'.$latex.'}';
    }
  if ($target eq 'web' || $target eq 'analyze') {   if ($target eq 'web' || $target eq 'analyze') {
     $result = &converted(\$latex);      $result = &converted(\$latex);
  } else {   } else {
Line 232  sub algebra { Line 240  sub algebra {
     }      }
 }  }
   
   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;
   
       # 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}$1/gs;
       &Apache::lonnet::logthis($string);
       return $string;
   }
 1;  1;
 __END__  __END__
   
Removed from v.1.44  
changed lines
  Added in v.1.58

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