--- loncom/xml/lontexconvert.pm	2005/02/24 10:09:32	1.58
+++ loncom/xml/lontexconvert.pm	2005/02/28 19:08:11	1.62
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA
 # TeX Conversion Module
 #
-# $Id: lontexconvert.pm,v 1.58 2005/02/24 10:09:32 albertel Exp $
+# $Id: lontexconvert.pm,v 1.62 2005/02/28 19:08:11 albertel Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -117,12 +117,14 @@ sub convert_real {
     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
@@ -140,6 +142,58 @@ ENDCONV
     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
 
 sub footer {
@@ -228,6 +282,7 @@ sub algebra {
 	if ($style eq 'display') {
 	    $latex='$$'.$latex.'$$x';
 	} else {
+	    # style is 'inline'
 	    $latex='\\ensuremath{'.$latex.'}';
 	}
 	if ($target eq 'web' || $target eq 'analyze') {
@@ -279,7 +334,6 @@ sub postprocess_algebra {
 
     # 
     $string =~s/\\lim\\left\((.+?),(.+?),(.+?)\\right\)/\\lim_{$2\\to $3}$1/gs;
-    &Apache::lonnet::logthis($string);
     return $string;
 }
 1;