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Name	Size	Permission
classes	[ DIR ]	drwxr-xr-x
db	[ DIR ]	drwxr-xr-x
lang	[ DIR ]	drwxr-xr-x
tests	[ DIR ]	drwxr-xr-x
README.mimetex	11.3 KB	-rw-r--r--
displaytex.php	1.72 KB	-rw-r--r--
filter.php	8.35 KB	-rw-r--r--
latex.php	6.91 KB	-rw-r--r--
lib.php	5.99 KB	-rw-r--r--
mimetex.darwin	2.78 MB	-rwxr-xr-x
mimetex.exe	1.36 MB	-rwxr-xr-x
mimetex.freebsd	1.35 MB	-rwxr-xr-x
mimetex.linux	1.67 MB	-rwxr-xr-x
mimetex.linux.aarch64	1.7 MB	-rwxr-xr-x
pix.php	3.06 KB	-rw-r--r--
readme_moodle.txt	1.02 KB	-rw-r--r--
settings.php	4.97 KB	-rw-r--r--
texdebug.php	15.54 KB	-rw-r--r--
thirdpartylibs.xml	229 B	-rw-r--r--
version.php	1.15 KB	-rw-rw-r--

Code Editor : lib.php

<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.

/**
 * TeX filter library functions.
 *
 * @package    filter
 * @subpackage tex
 * @copyright  2004 Zbigniew Fiedorowicz fiedorow@math.ohio-state.edu
 *             Originally based on code provided by Bruno Vernier bruno@vsbeducation.ca
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

defined('MOODLE_INTERNAL') || die();

function filter_tex_get_executable($debug=false) {
    global $CFG;

if ((PHP_OS == "WINNT") || (PHP_OS == "WIN32") || (PHP_OS == "Windows")) {
        return "$CFG->dirroot/filter/tex/mimetex.exe";
    }

if ($pathmimetex = get_config('filter_tex', 'pathmimetex')) {
        if (is_executable($pathmimetex)) {
            return $pathmimetex;
        } else {
            print_error('mimetexnotexecutable', 'error');
        }
    }

$custom_commandpath = "$CFG->dirroot/filter/tex/mimetex";
    if (file_exists($custom_commandpath)) {
        if (is_executable($custom_commandpath)) {
            return $custom_commandpath;
        } else {
            print_error('mimetexnotexecutable', 'error');
        }
    }

switch (PHP_OS) {
        case "Darwin":  return "$CFG->dirroot/filter/tex/mimetex.darwin";
        case "FreeBSD": return "$CFG->dirroot/filter/tex/mimetex.freebsd";
        case "Linux":
            if (php_uname('m') == 'aarch64') {
                return "$CFG->dirroot/filter/tex/mimetex.linux.aarch64";
            }

return "$CFG->dirroot/filter/tex/mimetex.linux";
    }

print_error('mimetexisnotexist', 'error');
}

/**
 * Check the formula expression against the list of denied keywords.
 *
 * List of allowed could be more complete but also harder to maintain.
 *
 * @param string $texexp Formula expression to check.
 * @return string Formula expression with denied keywords replaced with 'forbiddenkeyword'.
 */
function filter_tex_sanitize_formula(string $texexp): string {

$denylist = [
        'include', 'command', 'loop', 'repeat', 'open', 'toks', 'output',
        'input', 'catcode', 'name', '^^',
        '\def', '\edef', '\gdef', '\xdef',
        '\every', '\errhelp', '\errorstopmode', '\scrollmode', '\nonstopmode',
        '\batchmode', '\read', '\write', 'csname', '\newhelp', '\uppercase',
        '\lowercase', '\relax', '\aftergroup',
        '\afterassignment', '\expandafter', '\noexpand', '\special',
        '\let', '\futurelet', '\else', '\fi', '\chardef', '\makeatletter', '\afterground',
        '\noexpand', '\line', '\mathcode', '\item', '\section', '\mbox', '\declarerobustcommand',
    ];

$allowlist = ['inputenc'];

// Prepare the denylist for regular expression.
    $denylist = array_map(function($value){
        return '/' . preg_quote($value, '/') . '/i';
    }, $denylist);

// Prepare the allowlist for regular expression.
    $allowlist = array_map(function($value){
        return '/\bforbiddenkeyword_(' . preg_quote($value, '/') . ')\b/i';
    }, $allowlist);

// First, mangle all denied words.
    $texexp = preg_replace_callback($denylist,
        function($matches) {
            return 'forbiddenkeyword_' . $matches[0];
        },
        $texexp
    );

// Then, change back the allowed words.
    $texexp = preg_replace_callback($allowlist,
        function($matches) {
            return $matches[1];
        },
        $texexp
    );

return $texexp;
}

function filter_tex_get_cmd($pathname, $texexp) {
    $texexp = filter_tex_sanitize_formula($texexp);
    $texexp = escapeshellarg($texexp);
    $executable = filter_tex_get_executable(false);

if ((PHP_OS == "WINNT") || (PHP_OS == "WIN32") || (PHP_OS == "Windows")) {
        $executable = str_replace(' ', '^ ', $executable);
        return "$executable ++ -e  \"$pathname\" -- $texexp";

} else {
        return "\"$executable\" -e \"$pathname\" -- $texexp";
    }
}

/**
 * Purge all caches when settings changed.
 */
function filter_tex_updatedcallback($name) {
    global $CFG, $DB;
    reset_text_filters_cache();

if (file_exists("$CFG->dataroot/filter/tex")) {
        remove_dir("$CFG->dataroot/filter/tex");
    }
    if (file_exists("$CFG->dataroot/filter/algebra")) {
        remove_dir("$CFG->dataroot/filter/algebra");
    }
    if (file_exists("$CFG->tempdir/latex")) {
        remove_dir("$CFG->tempdir/latex");
    }

$DB->delete_records('cache_filters', array('filter'=>'tex'));
    $DB->delete_records('cache_filters', array('filter'=>'algebra'));

$pathlatex = get_config('filter_tex', 'pathlatex');
    if ($pathlatex === false) {
        // detailed settings not present yet
        return;
    }

$pathlatex = trim($pathlatex, " '\"");
    $pathdvips = trim(get_config('filter_tex', 'pathdvips'), " '\"");
    $pathconvert = trim(get_config('filter_tex', 'pathconvert'), " '\"");
    $pathdvisvgm = trim(get_config('filter_tex', 'pathdvisvgm'), " '\"");

$supportedformats = array('gif');
    if ((is_file($pathlatex) && is_executable($pathlatex)) &&
            (is_file($pathdvips) && is_executable($pathdvips))) {
        if (is_file($pathconvert) && is_executable($pathconvert)) {
             $supportedformats[] = 'png';
        }
        if (is_file($pathdvisvgm) && is_executable($pathdvisvgm)) {
             $supportedformats[] = 'svg';
        }
    }
    if (!in_array(get_config('filter_tex', 'convertformat'), $supportedformats)) {
        set_config('convertformat', array_pop($supportedformats), 'filter_tex');
    }

}

${this.title}

Code Editor : lib.php