--- loncom/xml/lontexconvert.pm 2007/08/14 19:32:35 1.84
+++ loncom/xml/lontexconvert.pm 2011/05/27 18:34:07 1.107
@@ -1,7 +1,7 @@
# The LearningOnline Network with CAPA
# TeX Conversion Module
#
-# $Id: lontexconvert.pm,v 1.84 2007/08/14 19:32:35 albertel Exp $
+# $Id: lontexconvert.pm,v 1.107 2011/05/27 18:34:07 raeburn Exp $
#
# Copyright Michigan State University Board of Trustees
#
@@ -47,7 +47,8 @@ use Apache::lonlocal;
use Apache::lonnet;
use lib '/home/httpd/lib/perl/';
use LONCAPA;
-
+use URI::Escape;
+use IO::Socket::INET;
# ====================================================================== Header
@@ -79,10 +80,7 @@ sub init_tth {
$Apache::lontexconvert::messedup=0;
-# we need this routine because &converted can get called from inside
-# of the safespace (through &xmlparse('
new(PeerAddr => $hostname,
+ PeerPort => 'http(80)',
+ Proto => 'tcp');
+ if ($socket) {
+ my $headreq = "HEAD $path HTTP/1.0\r\n\r\n";
+ print $socket $headreq;
+ while (<$socket>) {
+ if (/Vertical\-Align\:\s*?([\-\d]+)/) {
+ $valign = $1;
+ }
+ }
+ $socket->close();
+ }
+ &Apache::lonxml::end_alarm();
+ return $valign;
+}
+
sub mimetex_converted {
my $texstring=shift;
+
+# Alt-Argument for screen readers
+ my $alt_string=$$texstring;
+ $alt_string=~s/\"/\'\'/g;
+
+# Is this displaystyle?
+
my $displaystyle=&displaystyle($texstring);
+# Remove math environment delimiters
+
&clean_out_math_mode($texstring);
if ($displaystyle) {
$$texstring='\\displaystyle \\Large '.$$texstring;
}
- my $result='';
+ my $esc_texstring = &uri_escape($$texstring);
+ my $valign = &mimetex_valign($esc_texstring);
+ my $result='
';
if ($displaystyle) {
- $result='
'; + $outmessage.=''.$algebra.'
'; $tex=0; } else { - $outmessage.=&algebra($fragment,'web'); + $outmessage.=$algebra; $tex=0; } } else { - $outmessage.=$fragment; + $outmessage.=$fragment; $tex=1; } } @@ -342,9 +404,9 @@ sub msgtexconverted { sub algebra { use AlgParser; - - my ($string,$target,$style)=@_; + my ($string,$target,$style,$parstack,$safeeval,$tth)=@_; my $parser = new AlgParserWithImplicitExpand; + if ($tth eq 'tth') {&init_tth();} $string=&prepare_algebra($string); my $ret = $parser->parse($string); my $result='['.&mt('Algebra unconverted due to previous errors').']'; @@ -360,7 +422,9 @@ sub algebra { $latex='\\ensuremath{'.$latex.'}'; } if ($target eq 'web' || $target eq 'analyze') { - $result = &converted(\$latex); + my $display=&Apache::lonxml::get_param('display',$parstack,$safeeval); + $result = &converted(\$latex,$display); +# $result = &converted(\$latex); } else { $result = $latex; } @@ -407,8 +471,111 @@ sub postprocess_algebra { __END__ +=pod + +=head1 NAME + +Apache::lontexconvert; + +=head1 SYNOPSIS + +Access to tth/ttm + +This is part of the LearningOnline Network with CAPA project +described at http://www.lon-capa.org. + + +=head1 SUBROUTINES + +=over + +=item init_tth() + +Header + +=item convert_real() + + we need this routine because &converted can get called from inside + of the safespace (through &xmlparse('stuff ') which doesn't + allow the opcode for alarm, so we need to compile this before we get + into the safe space since opcode checks only occur at compile time + +=item tth_converted() + + +=item clean_out_math_mode() + + +=item displaystyle() + + +=item jsMath_converted() + + +=item tex_engine() + + +=item init_math_support() + +=item mimetex_valign() + + Makes a HEAD call to /cgi-bin/mimetex.cgi via IO:: to retrieve the + vertical alignment, before the subsequent call to mimetex_converted() + which generates thetag and the corresponding image. + + Input: 1. $esc_texstring (escaped TeX to be rendered by mimetex). + Output: 1. $valign - number of pixels: positive or negative integer + which will be included in
tag for mimetex image to + support vertical alignment of image within a line of text. + + If a server is running SSL, and Apache rewrite rules are in place + to rewrite requests for http to https, modification will most likely + be needed for pass through for HEAD requests for /cgi-bin/mimetex.cgi. + + Example rewrite rules which rewrite all http traffic to https, + except HEAD requests for /cgi-bin/mimetex.cgi are: + +
+ RewriteEngine On + RewriteLogLevel 0 + + RewriteCond %{HTTPS} off + RewriteCond %{HTTP:Host} (.*) + RewriteCond %{REQUEST_METHOD} !HEAD + RewriteRule ^/(.*) https://%1/$1 [R=301,L] + + RewriteCond %{HTTPS} off + RewriteCond %{HTTP:Host} (.*) + RewriteCond %{REQUEST_METHOD} HEAD + RewriteCond %{REQUEST_URI} !^/cgi-bin/mimetex.cgi + RewriteRule ^/(.*) https://%1/$1 [R=301,L] + + +=item mimetex_converted() + + +=item converted() + + +=item to_convert() + +message display + +=item smiley() + +??? + +=item msgtexconverted() + +=item algebra() + +=item prepare_algebra() + +=item postprocess_algebra() +=back +=cut