version 1.40, 2004/10/12 22:55:22
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version 1.62, 2005/02/28 19:08:11
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Line 36
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Line 36
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# 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 |
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# 5/4 Gerd Kortemeyer |
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package Apache::lontexconvert; |
package Apache::lontexconvert; |
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Line 112 sub convert_real {
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Line 110 sub convert_real {
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$errorstring.=&tth::ttherror(); |
$errorstring.=&tth::ttherror(); |
$xmlstring=~s-</font(\s*)>-</font>-g; |
$xmlstring=~s-</font(\s*)>-</font>-g; |
} |
} |
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$xmlstring=~s/^\s*\<br clear\=\"all\"/\<br/s; |
$xmlstring=~s/^\s*//; |
$xmlstring=~s/^\s*//; |
$xmlstring=~s/\s*$//; |
$xmlstring=~s/\s*$//; |
alarm(0); |
alarm(0); |
return ($xmlstring,$errorstring); |
return ($xmlstring,$errorstring); |
} |
} |
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sub converted { |
sub tth_converted { |
my $texstring=shift; |
my $texstring=shift; |
my $xmlstring='['.&mt('UNDISPLAYABLE').']'; |
my $xmlstring='['.&mt('UNDISPLAYABLE').']'; |
if ($Apache::lontexconvert::messedup) { |
if ($Apache::lontexconvert::messedup) { |
return '['.&mt('TeX unconverted due to previous errors').']'; |
return '['.&mt('TeX unconverted due to previous errors').']'; |
} |
} |
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$$texstring ='\\documentstyle{article}'.$$texstring; |
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eval(<<'ENDCONV'); |
eval(<<'ENDCONV'); |
($xmlstring,$errorstring)=&convert_real($texstring) |
($xmlstring,$errorstring)=&convert_real($texstring) |
ENDCONV |
ENDCONV |
Line 141 ENDCONV
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Line 142 ENDCONV
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return $xmlstring; |
return $xmlstring; |
} |
} |
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sub clean_out_math_mode { |
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my ($texstring)=@_; |
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$$texstring=~s/(?!\\)\$//g; |
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$$texstring=~s/\\[\)\(\]\[]//g; |
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$$texstring=~s/\\ensuremath//g; |
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return ''; |
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} |
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sub displaystyle { |
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my ($texstring)=@_; |
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#has a $$ or \[ or \displaystyle in it, guessinng it's display mode |
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if ($$texstring=~/[^\\]\$\$/ || |
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$$texstring=~/\\\[/ || |
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$$texstring=~/\\displaystyle/) { return 1; } |
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return 0; |
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} |
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sub jsMath_converted { |
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my $texstring=shift; |
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my $tag='span'; |
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if (&displaystyle($texstring)) { $tag='div'; } |
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&clean_out_math_mode($texstring); |
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return '<'.$tag.' class="math">'.$$texstring.'</'.$tag.'>'; |
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} |
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sub mimetex_converted { |
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my $texstring=shift; |
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my $displaystyle=&displaystyle($texstring); |
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&clean_out_math_mode($texstring); |
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if ($displaystyle) { |
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$$texstring='\\displaystyle \\Large '.$$texstring; |
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} |
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my $result='<img src="/cgi-bin/mimetex.cgi?'.&Apache::lonnet::escape($$texstring).'" />'; |
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if ($displaystyle) { |
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$result='<center>'.$result.'</center>'; |
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} |
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return $result; |
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} |
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sub converted { |
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if ($ENV{'environment.texengine'} eq 'tth') { |
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return &tth_converted; |
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} elsif ($ENV{'environment.texengine'} eq 'jsMath') { |
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return &jsMath_converted; |
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} elsif ($ENV{'environment.texengine'} eq 'mimetex') { |
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return &mimetex_converted; |
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} |
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return &tth_converted; |
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} |
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# ====================================================================== Footer |
# ====================================================================== Footer |
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sub footer { |
sub footer { |
Line 213 sub msgtexconverted {
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Line 266 sub msgtexconverted {
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} |
} |
} |
} |
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sub algebra { |
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use AlgParser; |
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my ($string,$target,$style)=@_; |
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my $parser = new AlgParserWithImplicitExpand; |
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$string=&prepare_algebra($string); |
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my $ret = $parser->parse($string); |
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my $result='['.&mt('Algebra unconverted due to previous errors').']'; |
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if ( ref($ret) ) { |
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#$parser->tostring(); |
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$parser->normalize(); |
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my $latex=$parser->tolatex(); |
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$latex=&postprocess_algebra($latex); |
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if ($style eq 'display') { |
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$latex='$$'.$latex.'$$x'; |
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} else { |
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# style is 'inline' |
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$latex='\\ensuremath{'.$latex.'}'; |
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} |
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if ($target eq 'web' || $target eq 'analyze') { |
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$result = &converted(\$latex); |
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} else { |
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$result = $latex; |
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} |
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} else { |
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&Apache::lonxml::error($parser->{'htmlerror'}); |
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} |
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} |
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sub prepare_algebra { |
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my ($string)=@_; |
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# makes the decision about what is a minus sign easier supposedly |
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$string =~ s/(\<\>|\<\=|\>\=[\=\>\<] *)-/$1 zeroplace -/g; |
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return $string; |
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} |
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sub postprocess_algebra { |
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my ($string)=@_; |
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# moodle had these and I don't know why, ignoring them for now |
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# $string =~s/\\fun/ /g; |
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# sqrt(3,4) -> \sqrt\let{3,4\right}, which is annoying |
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$string =~s/\\left\{/\{/g; |
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$string =~s/\\right\}/\}/g; |
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# remove the extra () in the denominator of a \frac |
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$string =~s/\\frac{(.+?)}{\\left\((.+?)\\right\)}/\\frac{$1}{$2}/gs; |
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# sqrt(3,4) means the 4 root of 3 |
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$string =~s/\\sqrt{([^,]+),([^\}]+)}/\\sqrt[$2]{$1}/gs; |
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# log(3,4) means the log base 4 of 3 |
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$string =~s/\\log\\left\((.+?),(.+?)\\right\)/\\log_{$2}\\left($1\\right)/gs; |
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# log(3,4) means the log base 4 of 3 |
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$string =~s/\\((?:sin|cos|tan|sec|csc|cot)(?:h)?)\\left\((.+?),(.+?)\\right\)/\\$1^{$3}\\left($2\\right)/gs; |
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# int(3,a,b) integral from a to b of 3 |
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$string =~s/\\int\\left\((.+?),(.+?),(.+?)\\right\)/\\int_{$2}^{$3}\\left($1\\right)/gs; |
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# int( ... dx) -> ... |
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$string =~s/\\int\\left\((.+?)d[a-z]\\right\)/$1/gs; |
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# |
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$string =~s/\\lim\\left\((.+?),(.+?),(.+?)\\right\)/\\lim_{$2\\to $3}$1/gs; |
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return $string; |
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} |
1; |
1; |
__END__ |
__END__ |
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