--- loncom/xml/lontexconvert.pm	2005/02/09 15:45:19	1.42
+++ loncom/xml/lontexconvert.pm	2006/01/27 23:55:15	1.69
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA
 # TeX Conversion Module
 #
-# $Id: lontexconvert.pm,v 1.42 2005/02/09 15:45:19 www Exp $
+# $Id: lontexconvert.pm,v 1.69 2006/01/27 23:55:15 albertel Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -36,8 +36,6 @@
 # The C source of the Code may not be distributed by the Licensee
 # to any other parties under any circumstances.
 #
-# 05/29/00,05/30,10/11,10/20 Gerd Kortemeyer
-# 5/4 Gerd Kortemeyer
 
 package Apache::lontexconvert;
 
@@ -49,21 +47,22 @@ use Apache::lonmsg();
 use Apache::lonxml();
 use Apache::lonmenu();
 use Apache::lonlocal;
+use Apache::lonnet;
 
 # ====================================================================== Header
 
 sub init_tth {
-    my $options=$ENV{'course.'.$ENV{'request.course.id'}.'.tthoptions'};
-    if ($ENV{'browser.mathml'}) {
+    my $options=$env{'course.'.$env{'request.course.id'}.'.tthoptions'};
+    if ($env{'browser.mathml'}) {
 	&tth::ttminit();
-	if ($ENV{'browser.unicode'}) {
+	if ($env{'browser.unicode'}) {
 	    &tth::ttmoptions('-L -u1 '.$options);
 	} else {
 	    &tth::ttmoptions('-L -u0 '.$options);
 	}
     } else {
 	&tth::tthinit();
-	if ($ENV{'browser.unicode'}) {
+	if ($env{'browser.unicode'}) {
 	    &tth::tthoptions('-L -u1 '.$options);
 	} else {
 	    &tth::tthoptions('-L -u0 '.$options);
@@ -100,8 +99,8 @@ sub convert_real {
 	$Apache::lontexconvert::messedup=1;
 	die &mt("TeX unconverted due to errors");
     };
-    alarm($Apache::lonnet::perlvar{'lonScriptTimeout'});
-    if ($ENV{'browser.mathml'}) {
+    &Apache::lonxml::start_alarm();
+    if ($env{'browser.mathml'}) {
 	$xmlstring=&tth::ttm($$texstring);
 	$xmlstring=~s/\<math\>/\<math xmlns=\"\&mathns\;\"\>/g;
 	$xmlstring=~s/\<br\>/\<br\/\>/g;
@@ -112,19 +111,21 @@ sub convert_real {
 	$errorstring.=&tth::ttherror();
 	$xmlstring=~s-</font(\s*)>-</font>-g;
     }
-    $xmlstring=~s/\s*\<br clear\=\"all\"/\<br/s;
+    $xmlstring=~s/^\s*\<br clear\=\"all\"/\<br/s;
     $xmlstring=~s/^\s*//;
     $xmlstring=~s/\s*$//;
-    alarm(0);
+    &Apache::lonxml::end_alarm();
     return ($xmlstring,$errorstring);
 }
 
-sub converted {
+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
@@ -136,20 +137,94 @@ ENDCONV
 	$errorstring) {
 	&Apache::lonnet::logthis("Trying to kill myself");
 	$Apache::lontexconvert::messedup=1;
-	my $request=Apache->request();
-	$request->child_terminate();
+	$Apache::lonxml::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=~/\\\[/ ||
+	$$texstring=~/\\displaystyle/) { return 1; }
+    return 0;
+}
+
+sub jsMath_converted {
+    my $texstring=shift;
+    my $tag='span';
+    if (&displaystyle($texstring)) { $tag='div'; }
+    &clean_out_math_mode($texstring);
+    return &jsMath_header().
+	'<'.$tag.' class="math">'.$$texstring.'</'.$tag.'>';
+}
+
+{
+    my $jsMath_sent_header;
+    sub jsMath_reset {
+	$jsMath_sent_header=0;
+    }
+    sub jsMath_header {
+	return '' if $jsMath_sent_header;
+	$jsMath_sent_header=1;
+	return
+            '<script type="text/javascript">
+                     function NoFontMessage () {}
+                   </script>'."\n".
+	    '<script src="/adm/jsMath/jsMath.js"></script>'."\n";
+    }
+    sub jsMath_process {
+	return '' if !$jsMath_sent_header;
+	return '<script type="text/javascript">jsMath.Process()</script>';
+    }
+}
+
+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 $result;
+}
+
+sub converted {
+    my ($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);
+}
+
 # ====================================================================== Footer
 
 sub footer {
   my $xmlstring='';
-  if ($ENV{'request.state'} eq 'construct') {
+  if ($env{'request.state'} eq 'construct') {
       $xmlstring.='<address>'.$errorstring.'</address>';
   } else {
-      &Apache::lonmsg::author_res_msg($ENV{'request.filename'},$errorstring);
+      &Apache::lonmsg::author_res_msg($env{'request.filename'},$errorstring);
   }
 # -------------------------------------------------------------------- End Body
   $xmlstring.=&Apache::lonxml::xmlend();
@@ -168,7 +243,7 @@ sub to_convert {
 
 sub smiley {
     my $expression=shift;
-    if ($ENV{'browser.imagesuppress'} eq 'on') { return $expression; }
+    if ($env{'browser.imagesuppress'} eq 'on') { return $expression; }
     my %smileys=('\:\-\)' => 'smiley',
 		 '8\-\)'  => 'coolsmile',
 		 '8\-(I|\|)'   => 'coolindiff',
@@ -207,6 +282,18 @@ sub msgtexconverted {
             $outmessage.=&smiley($_); $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 {
@@ -214,6 +301,72 @@ sub msgtexconverted {
     }
 }
 
+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;
+
+    # 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;
 __END__