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Changed the name of all filters to be consistent.
Removed texh filter
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moodler
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filter
@ -6,9 +6,9 @@
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// printed text, replacing words with other words
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//
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// To activate this filter, add a line like this to your
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// config.php:
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// list of filters in your Filter configuration:
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//
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// $CFG->textfilter1 = 'filter/censor/censor.php';
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// filter/censor/filter.php
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//
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//////////////////////////////////////////////////////////////
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@ -5,10 +5,10 @@
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// This filter will replace any links to a media file with
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// a media plugin that plays that media inline
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//
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// To activate this filter, add his to your list of filters
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// in Admin -> Configuration -> Variables
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// To activate this filter, add a line like this to your
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// list of filters in your Filter configuration:
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//
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// filter/mediaplugin/mediaplugin.php';
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// filter/mediaplugin/filter.php
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//
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//////////////////////////////////////////////////////////////
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@ -22,6 +22,11 @@
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// //
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///////////////////////////////////////////////////////////////////////////
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// //
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// To activate this filter, add a line like this to your //
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// list of filters in your Filter configuration: //
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// //
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// filter/multilang/filter.php //
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// //
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// See README.txt for more information about this module //
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// //
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///////////////////////////////////////////////////////////////////////////
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@ -24,13 +24,17 @@
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// NOTE: This Moodle text filter converts TeX expressions delimited
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// by either $$...$$ or by <tex...>...</tex> tags to gif images using
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// mimetex.cgi obtained from http://www.forkosh.com/mimetex.html authored by
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// John Forkosh john@forkosh.com. The mimetex.cgi ELF binary compiled for Linux i386
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// is included with this distribution.
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// John Forkosh john@forkosh.com. Several binaries of this areincluded with
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// this distribution.
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// Note that there may be patent restrictions on the production of gif images
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// in Canada and some parts of Western Europe and Japan until July 2004.
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//-------------------------------------------------------------------------
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// You will then need to edit your moodle/config.php to invoke tex_filter.php
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//-------------------------------------------------------------------------
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/////////////////////////////////////////////////////////////////////////////
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// To activate this filter, add a line like this to your //
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// list of filters in your Filter configuration: //
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// //
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// filter/tex/filter.php //
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/////////////////////////////////////////////////////////////////////////////
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$CFG->texfilterdir = "filter/tex";
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@ -1,131 +0,0 @@
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<?php
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///////////////////////////////////////////////////////////////////////////
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// //
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// NOTICE OF COPYRIGHT //
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// //
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// TeXH - convert TeX code in <tex> tags into images, using HeVeA //
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// //
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// Copyright (C) 2001-2003 Bruno Vernier bruno@vsbeducation.ca //
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// //
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// This program is free software; you can redistribute it and/or modify //
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// it under the terms of the GNU General Public License as published by //
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// the Free Software Foundation; either version 2 of the License, or //
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// (at your option) any later version. //
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// //
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// This program is distributed in the hope that it will be useful, //
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// but WITHOUT ANY WARRANTY; without even the implied warranty of //
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
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// GNU General Public License for more details: //
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// //
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// http://www.gnu.org/copyleft/gpl.html //
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// //
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///////////////////////////////////////////////////////////////////////////
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//-------------------------------------------------------------------------
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//
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// README PREREQUISITES:
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//
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// 1: install HeVeA on your server http://pauillac.inria.fr/~maranget/hevea/
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// (debian and rpm available) (it is a TeX to HTML/MathML filter)
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//
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// 2: must include this file "texh.php" in the filters in config.php
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//
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// 3: must include TEX in the legal tags list in lib/weblib.php
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// CAVEAT: if above not yet done, <TEX> gets converted to <TEX>
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// and can only be fixed by editing in HTML conversion mode
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//
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// 4: if you are using Windows then the hevea.bat file that comes with the
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// windows distribution needs to have the line
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// if "%1"=="" goto syn
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// removed.
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//
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//-------------------------------------------------------------------------
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/// These lines are important - the variable must match the name
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/// of the actual function below
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$textfilter_function='texh_filter';
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if (function_exists($textfilter_function)) {
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return;
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}
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function texh_pipe_cmd($cmd, $text) {
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// general function for external system calls to $cmd, piping in $text, retrieving output
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// taken mostly from a php tutorial on php.net website (modified slightly)
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$spec = array(
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0 => array("pipe", "r"), // stdin
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1 => array("pipe", "w"), // stdout
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);
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$process = proc_open($cmd , $spec, $pipes);
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$output="";
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if (is_resource($process)) {
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fwrite($pipes[0], $text);
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fclose($pipes[0]);
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while (!feof($pipes[1])) {
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$buffer = fgets($pipes[1], 1024);
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$output .= $buffer;
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}
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fclose($pipes[1]);
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proc_close($process);
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}
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return $output;
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}
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function texh_filter ($courseid, $text) {
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// TeX conversion with $$ tex code $$
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// written by Bruno Vernier (c) 2004 GPL
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/// Do a quick check using stripos to avoid unnecessary work
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if (!(stripos($text, '<tex') or stripos($text, '$$'))) {
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return $text;
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}
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if (isadmin()) { error_reporting (E_ALL); }; //for debugging
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// <TEX> some general TeX expression </TEX>
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preg_match_all('/<tex>(.+?)<\/tex>/is', $text, $matches);
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for ($i=0; $i<count($matches[0]); $i++) {
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$pipe = texh_pipe_cmd("hevea",$matches[1][$i]); // take the content only (non-math TeX expected)
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$text = str_replace( $matches[0][$i], $pipe, $text);
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}
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// $$ some MATHEMATICAL TeX expression $$
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preg_match_all('/\$\$(.+?)\$\$/', $text, $matches);
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for ($i=0; $i<count($matches[0]); $i++) {
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$pipe = texh_pipe_cmd("hevea",$matches[0][$i]); // take everything since the $$ is part of the TeX syntax for math
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$text = str_replace( $matches[0][$i], $pipe, $text);
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}
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return $text;
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}
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// Various Notes and Possibilities for Developers only:
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// Note to self: the following did not work consistently:
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// $text = preg_replace('/\$\$(.*?)\$\$/', texh_pipe_cmd('hevea',"\\$0"), $text);
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// whereas this seems to work consistently:
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// $text = str_replace( $matches[0][$i], texh_pipe_cmd("hevea",$matches[0][$i]), $text);
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// TODO:
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//
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// - user-friendly guide to inputting TeX (at least enough for up to high school level math)
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// - caveat regarding square-roots and roots being converted to fractional exponents
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// - integrate memaid http://memaid.sourceforge.net
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// - compile a list of useful shortcuts and shorthands worth doing here
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// future possibilities
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// $text = str_replace("my_marks", "my marks are ...%", $text); // insert SQL/php_function results here
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// $text = str_replace("my_uptime", "uptime: ". shell_exec("/usr/bin/uptime") , $text); // a shortcut to a safe system call
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// $text = preg_replace("/vernier/", "Mr. Bruno Vernier" , $text); // a shortcut expanded
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// Version 0.1 Jan 24,2004
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?>
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