version 1.91, 2008/11/24 17:17:51
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version 1.98.2.1, 2011/02/10 20:07:00
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Line 47 use Apache::lonlocal;
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Line 47 use Apache::lonlocal;
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use Apache::lonnet; |
use Apache::lonnet; |
use lib '/home/httpd/lib/perl/'; |
use lib '/home/httpd/lib/perl/'; |
use LONCAPA; |
use LONCAPA; |
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use URI::Escape; |
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use IO::Socket::INET; |
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# ====================================================================== Header |
# ====================================================================== Header |
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Line 241 sub init_math_support {
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Line 242 sub init_math_support {
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return; |
return; |
} |
} |
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sub mimetex_valign { |
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my ($esc_texstring)=@_; |
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my $valign = 0; |
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my $lonhost = $Apache::lonnet::perlvar{'lonHostID'}; |
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my $hostname = &Apache::lonnet::hostname($lonhost); |
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my $path = '/cgi-bin/mimetex.cgi?'.$esc_texstring; |
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my $socket; |
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&Apache::lonxml::start_alarm(); |
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my $socket = IO::Socket::INET->new(PeerAddr => $hostname, |
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PeerPort => 'http(80)', |
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Proto => 'tcp'); |
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if ($socket) { |
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my $headreq = "HEAD $path HTTP/1.0\r\n\r\n"; |
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print $socket $headreq; |
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while (<$socket>) { |
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if (/Vertical\-Align\:\s*?([\-\d]+)/) { |
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$valign = $1; |
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} |
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} |
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$socket->close(); |
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} |
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&Apache::lonxml::end_alarm(); |
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return $valign; |
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} |
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sub mimetex_converted { |
sub mimetex_converted { |
my $texstring=shift; |
my $texstring=shift; |
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# Alt-Argument for screen readers |
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my $alt_string=$$texstring; |
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$alt_string=~s/\"/\'\'/g; |
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# Is this displaystyle? |
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my $displaystyle=&displaystyle($texstring); |
my $displaystyle=&displaystyle($texstring); |
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# Remove math environment delimiters |
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&clean_out_math_mode($texstring); |
&clean_out_math_mode($texstring); |
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if ($displaystyle) { |
if ($displaystyle) { |
$$texstring='\\displaystyle \\Large '.$$texstring; |
$$texstring='\\displaystyle \\Large '.$$texstring; |
} |
} |
my $result='<img src="/cgi-bin/mimetex.cgi?'.&escape($$texstring).'" alt="$'.$$texstring.'$" />'; |
my $esc_texstring = &uri_escape($$texstring); |
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my $valign = &mimetex_valign($esc_texstring); |
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my $result='<img src="/cgi-bin/mimetex.cgi?'.$esc_texstring.'" style="vertical-align:'.$valign.'px" alt="'.$alt_string.'" />'; |
if ($displaystyle) { |
if ($displaystyle) { |
$result='<center>'.$result.'</center>'; |
$result='<center>'.$result.'</center>'; |
} |
} |
Line 266 sub converted {
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Line 303 sub converted {
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return &jsMath_converted($string); |
return &jsMath_converted($string); |
} elsif ($mode =~ /mimetex/i) { |
} elsif ($mode =~ /mimetex/i) { |
return &mimetex_converted($string); |
return &mimetex_converted($string); |
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} elsif ($mode =~ /raw/i) { |
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return $$string; |
} |
} |
return &tth_converted($string); |
return &tth_converted($string); |
} |
} |
Line 462 Header
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Line 501 Header
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=item init_math_support() |
=item init_math_support() |
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=item mimetex_valign() |
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Makes a HEAD call to /cgi-bin/mimetex.cgi via IO:: to retrieve the |
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vertical alignment, before the subsequent call to mimetex_converted() |
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which generates the <img> tag and the corresponding image. |
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Input: 1. $esc_texstring (escaped TeX to be rendered by mimetex). |
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Output: 1. $valign - number of pixels: positive or negative integer |
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which will be included in <img> tag for mimetex image to |
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support vertical alignment of image within a line of text. |
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If a server is running SSL, and Apache rewrite rules are in place |
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to rewrite requests for http to https, modification will most likely |
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be needed for pass through for HEAD requests for /cgi-bin/mimetex.cgi. |
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Example rewrite rules which rewrite all http traffic to https, |
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except HEAD requests for /cgi-bin/mimetex.cgi are: |
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<IfModule mod_rewrite.c> |
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RewriteEngine On |
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RewriteLogLevel 0 |
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RewriteCond %{HTTPS} off |
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RewriteCond %{HTTP:Host} (.*) |
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RewriteCond %{REQUEST_METHOD} !HEAD |
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RewriteRule ^/(.*) https://%1/$1 [R=301,L] |
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RewriteCond %{HTTPS} off |
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RewriteCond %{HTTP:Host} (.*) |
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RewriteCond %{REQUEST_METHOD} HEAD |
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RewriteCond %{REQUEST_URI} !^/cgi-bin/mimetex.cgi |
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RewriteRule ^/(.*) https://%1/$1 [R=301,L] |
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</IfModule> |
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=item mimetex_converted() |
=item mimetex_converted() |
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