--- loncom/xml/londefdef.pm	2006/01/03 23:41:52	1.307
+++ loncom/xml/londefdef.pm	2006/02/15 11:57:44	1.320
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA
 # Tags Default Definition Module 
 #
-# $Id: londefdef.pm,v 1.307 2006/01/03 23:41:52 foxr Exp $
+# $Id: londefdef.pm,v 1.320 2006/02/15 11:57:44 foxr Exp $
 # 
 #
 # Copyright Michigan State University Board of Trustees
@@ -105,11 +105,21 @@ sub start_m {
 	    $inside=&Apache::run::evaluate($inside,$safeeval,$$parstack[-1]);
 	    #&Apache::lonxml::debug("M is evaulated to:$inside:");
 	}
+	my $tex = $inside;
 	my $display=&Apache::lonxml::get_param('display',$parstack,$safeeval);
 	$currentstring = &Apache::lontexconvert::converted(\$inside,$display);
 	if ($Apache::lontexconvert::errorstring) {
-	    &Apache::lonxml::warning("tth error: ".
-				     $Apache::lontexconvert::errorstring);
+	    my $errormsg='<pre>'.&HTML::Entities::encode($Apache::lontexconvert::errorstring,'<>&"').'</pre> occured while attempting to convert this TeX: <pre>';
+	    $tex = &HTML::Entities::encode($tex,'<>&"');
+	    my ($linenumber) =
+		($Apache::lontexconvert::errorstring =~ /Line (\d+)/);
+	    if (defined($linenumber)) {
+		my @tex=split("\n",$tex);
+		$tex[$linenumber]='<b><font color="red">'.
+		    $tex[$linenumber].'</font></b>';
+		$tex=join("\n",@tex);
+	    }
+	    &Apache::lonxml::warning($errormsg.$tex.'</pre>');
 	    $Apache::lontexconvert::errorstring='';
 	}
 	#&Apache::lonxml::debug("M is ends with:$currentstring:");
@@ -594,20 +604,26 @@ sub end_body {
     return $currentstring;
 }
 
+# \begin{center} causes a new paragprah spacing that looks odd inside 
+# of a table cell
+sub center_correction { return '\vspace*{-6 mm}'; }
 #-- <center> tag (end tag required)
 sub start_center {
-    my ($target,$token) = @_;
+    my ($target,$token,$tagstack) = @_;
     my $currentstring = &end_p();	# Close off any prior para.
     if ($target eq 'web') {
 	$currentstring .= $token->[4];     
     } elsif ($target eq 'tex') {
+	if (&is_inside_of($tagstack, "table")) {
+	    $currentstring .= &center_correction();
+	}
 	$currentstring .= '\begin{center}';  
     }
     return $currentstring;
 }
 
 sub end_center {
-    my ($target,$token) = @_;
+    my ($target,$token,$tagstack) = @_;
     my $currentstring = '';
     if ($target eq 'web') {
 	$currentstring = $token->[2];     
@@ -1178,11 +1194,15 @@ sub start_p {
 	    $closing_string = '</p>'; # Deal correctly with <p /> e.g.
 	}
     } elsif ($target eq 'tex' && !$para_disabled) {
+
 	$currentstring .= &end_p();	# close off prior para if in progress.
 	my $align=&Apache::lonxml::get_param('align',$parstack,$safeeval,undef,1);
 	if ($align eq 'center') {
 	    $currentstring .='\begin{center}\par';
 	    $closing_string = '\end{center}';
+	    if (&is_inside_of($tagstack, "table")) {
+		$currentstring = &center_correction().$currentstring;
+	    }
 	} elsif ($align eq 'right') {
 	    $currentstring.='\makebox['.$env{'form.textwidth'}.']{\hfill\llap{';
 	    $closing_string= '}}';
@@ -1191,7 +1211,11 @@ sub start_p {
 	    $closing_string = '}\hfill}';
 	} else {
             $currentstring.='\par ';
-	    $closing_string = '\strut\\\\\strut ';
+	    if (&is_inside_of($tagstack, 'table')) {
+		$closing_string = '\vskip 0pt'; # Seems to be consistent with <p> in tables.
+	    } else {
+		$closing_string = '\strut\\\\\strut ';
+	    }
         }
 
     }
@@ -1524,6 +1548,9 @@ sub start_div {
 	if ($align eq 'center') {
 	    $currentstring .= '\begin{center}';
 	    $endstring      = '\end{center}';
+	    if (&is_inside_of($tagstack, "table")) {
+		$currentstring = &center_correction().$currentstring;
+	    }
 	}
 	elsif ($align eq 'right') {
 	    $currentstring .= '\begin{flushright}';
@@ -1944,11 +1971,16 @@ sub start_table {
 
 	# width either comes forced from the TeXwidth or the width parameters.
 	# in either case it can be a percentage or absolute width.
-
+	# in the width case we ignore absolute width 
 	my $TeXwidth = &Apache::lonxml::get_param('TeXwidth',$parstack,$safeeval,undef,0);
-	if (not defined $TeXwidth) {
-	    $TeXwidth = &Apache::lonxml::get_param('width',$parstack,$safeeval,undef,1);
-
+	if (!defined($TeXwidth)) {
+	    my $htmlwidth = &Apache::lonxml::get_param('width',$parstack,
+						       $safeeval,undef,1);
+	    if ($htmlwidth =~ /%/) {
+		$TeXwidth = $htmlwidth;
+	    } else { 
+		$TeXwidth = $textwidth;
+	    }
 	} else {
 	    $Apache::londefdef::table[-1]{'forcedtablewidth'} = 1;
 	}
@@ -1958,7 +1990,12 @@ sub start_table {
             $Apache::londefdef::table[-1]{'width'}=$1*$textwidth/100;
 	} else {
 	    $Apache::londefdef::table[-1]{'width'}=$TeXwidth;
-	}        
+	}
+        #  In the end, however the table width cannot be wider than $textwidth...
+	
+	if ($Apache::londefdef::table[-1]{'width'} > $textwidth) {
+	    $Apache::londefdef::table[-1]{'width'} = $textwidth;
+	}
 
         #table's border
 	my $border = &Apache::lonxml::get_param('border',$parstack,$safeeval); 
@@ -2002,7 +2039,7 @@ sub end_table {
 	my $inmemory = '';
 	my $output = '';
 	my $WARNING='';
-	# &debug_dump_table($Apache::londefdef::table[-1]);
+	&debug_dump_table($Apache::londefdef::table[-1]);
         #width of columns from TeXwidth attributes
 
 	for (my $in=0;$in<=$Apache::londefdef::table[-1]{'row_number'};$in++) {
@@ -2189,18 +2226,26 @@ sub end_table {
 	for (my $in=0;$in<=$Apache::londefdef::table[-1]{'row_number'};$in++) {
 	    my $have_rowspan = 0;
 	    for (my $jn=0;$jn<=$#fwidth;$jn++) {
+
+		#-----------------------------------------------------------
+                #   I think this order of doing things will ensure that
+		#   single rowspan, columspan and combined row/colspans will
+                #   work correctly.  LaTeX is delicate here.
+		#    RF.
+
+		# Start a rowspan if necessary:
+
+		my $rowspan = $Apache::londefdef::table[-1]{'rowspan'}[$in][$jn];
+		my $colspan = $Apache::londefdef::table[-1]{'colspan'}[$in][$jn];
 		#
 		#  Do the appropriate magic if this has a colspan
 		# 
-		my $colspan = $Apache::londefdef::table[-1]{'colspan'}[$in][$jn];
+
 		if ($colspan > 1) {
 		    $output .= '\multicolumn{'.
 			$colspan
 			.'}{|l|}{';
 		}
-		my $rowspan = $Apache::londefdef::table[-1]{'rowspan'}[$in][$jn];
-
-		# Start a rowspan if necessary:
 
 		if ($rowspan > 1) {
 		    $have_rowspan++;
@@ -2209,16 +2254,15 @@ sub end_table {
 		if (($rowspan eq '^') || ($rowspan eq '_')) {
 		    $have_rowspan++;
 		}
+		#--------------------------------------------------------------
 
 		if ($Apache::londefdef::table[-1]{'align'}[$in][$jn] eq 'c') {
-		    # $output.='\vspace*{-6 mm}\begin{center}';
-		    $output.='\begin{center}';
+		    $output.=&center_correction().'\begin{center}';
 		} elsif ($Apache::londefdef::table[-1]{'align'}[$in][$jn] eq 'r') {
 		    $output.=' \hfill \llap{'
 		}
 		$output.=$Apache::londefdef::table[-1]{'content'}[$in][$jn];
 		if ($Apache::londefdef::table[-1]{'align'}[$in][$jn] eq 'c') {
-		    # $output.='\end{center}\vspace*{-6 mm}';
 		    $output.='\end{center}';
 		} elsif ($Apache::londefdef::table[-1]{'align'}[$in][$jn] eq 'r') {
 		    $output.='} ';
@@ -2245,9 +2289,11 @@ sub end_table {
 		$output .= ' \\\\ ';
 		for (my $jn=0; $jn<=$#fwidth;$jn++) {
 		    my $rowspan = $Apache::londefdef::table[-1]{'rowspan'}[$in][$jn];
-		    if (($rowspan <= 1) || ($rowspan eq '_')) {
-			my $column = $jn+1;
-			$output .= '\cline{'.$column.'-'.$column.'} ';
+		    if ($rowspan ne "^") {
+			if (($rowspan <= 1) || ($rowspan eq '_')) {
+			    my $column = $jn+1;
+			    $output .= '\cline{'.$column.'-'.$column.'} ';
+			}
 		    }
 		}
 
@@ -2417,6 +2463,13 @@ sub end_td_tex {
     $Apache::londefdef::table[-1]{'counter_columns'} = $current_column;
    
 
+    # Get the column and row spans.
+    # Colspan can be done via \multicolumn if I can figure out the data structs.
+
+    my $colspan = &Apache::lonxml::get_param('colspan', $parstack, $safeeval, undef, 0);
+    if (!$colspan) {
+	$colspan = 1;
+    }
 
     my $rowspan = &Apache::lonxml::get_param('rowspan', $parstack, $safeeval, undef, 0);
     if (!$rowspan) {
@@ -2425,11 +2478,13 @@ sub end_td_tex {
 
 
 
-    $Apache::londefdef::table[-1]{'rowspan'}[$current_row][$current_column] = $rowspan;
-    for (my $i = 1; $i < $rowspan; $i++) {
-	$Apache::londefdef::table[-1]{'rowspan'}[$current_row+$i][$current_column] = '^';
-	if ($i == ($rowspan-1)) {
-	    $Apache::londefdef::table[-1]{'rowspan'}[$current_row+$i][$current_column] = '_';
+    for (my $c = 0; $c < $colspan; $c++) {
+	$Apache::londefdef::table[-1]{'rowspan'}[$current_row][$current_column+$c] = $rowspan;
+	for (my $i = 1; $i < $rowspan; $i++) {
+	    $Apache::londefdef::table[-1]{'rowspan'}[$current_row+$i][$current_column+$c] = '^';
+	    if ($i == ($rowspan-1)) {
+		$Apache::londefdef::table[-1]{'rowspan'}[$current_row+$i][$current_column+$c] = '_';
+	    }
 	}
     }
 
@@ -2524,13 +2579,7 @@ sub end_td_tex {
 
     push @ {$Apache::londefdef::table[-1]{'content'}[-1] },$data;
 
-    # Get the column and row spans.
-    # Colspan can be done via \multicolumn if I can figure out the data structs.
 
-    my $colspan = &Apache::lonxml::get_param('colspan', $parstack, $safeeval, undef, 0);
-    if (!$colspan) {
-	$colspan = 1;
-    }
 
 
     #  the colspan array will indicate how many columns will be spanned by this
@@ -2539,14 +2588,16 @@ sub end_td_tex {
     #  counter_columns is incremented in the start_td_tex, we adjust by colspan-1.
     #
 
-    $Apache::londefdef::table[-1]{'colspan'}[$current_row][$current_column] = $colspan;
     $Apache::londefdef::table[-1]{'counter_columns'} += $colspan -1;
-
-    # Put empty text in spanned cols.
-
     for (my $i = 0; $i < ($colspan -1); $i++) {
 	push @ {$Apache::londefdef::table[-1]{'content'}[-1] },'';
     }
+    for (my $r = 0; $r < $rowspan; $r++) {
+	$Apache::londefdef::table[-1]{'colspan'}[$current_row+$r][$current_column] = $colspan;
+	# Put empty text in spanned cols.
+	
+    }
+
 
 
     return '';
@@ -2745,11 +2796,7 @@ sub start_img {
 						  $safeeval,
 						  undef,1));
 	if(!$align) {
-	    if (&is_inside_of($tagstack, "table")) {
-		$align = "right";      # Force wraptext use. 
-	    } else {
 		$align = "bottom";	# This is html's default so it's ours too.
-	    }
 	}
 	#
 	&Apache::lonxml::debug("Alignemnt = $align");
@@ -2764,11 +2811,17 @@ sub start_img {
 							    $parstack,
 							    $safeeval,
 							    undef,0);
-	&Apache::lonxml::debug("LaTeX rendering = $latex_rendering");
+	# &Apache::lonxml::debug("LaTeX rendering = $latex_rendering");
 	if(!$latex_rendering) {
-	    $latex_rendering = "texwrap";
+		$latex_rendering = "texwrap";
+	}
+	# using texwrap inside a table does not work. So, if after all of this,
+	# texwrap is on, we turn it off if we detect we're in a table:
+	#
+	if (($latex_rendering eq 'texwrap') && &is_inside_of($tagstack, "table")) {
+	    $latex_rendering = 'parpic';
 	}
-	&Apache::lonxml::debug("LaTeX rendering = $latex_rendering image file: $src");
+	# &Apache::lonxml::debug("LaTeX rendering = $latex_rendering image file: $src");
 
 	#if original gif/jpg/png file exist do following:
 	my $origsrc=$src;
@@ -3142,6 +3195,7 @@ sub start_pre {
 	$currentstring .= $token->[4];
     } elsif ($target eq 'tex') {
 	$currentstring .= '\begin{verbatim}';
+	&Apache::lonxml::disable_LaTeX_substitutions();
     } 
     return $currentstring;
 }
@@ -3153,6 +3207,7 @@ sub end_pre {
 	$currentstring .= $token->[2];
     } elsif ($target eq 'tex') {
 	$currentstring .= '\end{verbatim}';
+	&Apache::lonxml::enable_LaTeX_substitutions();
     }
     return $currentstring;
 }