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You just need to override this class and * implement the filter method. * * @package core_filters * @copyright 1999 onwards Martin Dougiamas {@link http://moodle.com} * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later */ abstract class text_filter { /** @var context The context we are in. */ protected $context; /** @var array Any local configuration for this filter in this context. */ protected $localconfig; /** * Set any context-specific configuration for this filter. * * @param context $context The current context. * @param array $localconfig Any context-specific configuration for this filter. */ public function __construct($context, array $localconfig) { $this->context = $context; $this->localconfig = $localconfig; } /** * Setup page with filter requirements and other prepare stuff. * * Override this method if the filter needs to setup page * requirements or needs other stuff to be executed. * * Note this method is invoked from {@see setup_page_for_filters()} * for each piece of text being filtered, so it is responsible * for controlling its own execution cardinality. * * @param moodle_page $page the page we are going to add requirements to. * @param context $context the context which contents are going to be filtered. * @since Moodle 2.3 */ public function setup($page, $context) { // Override me, if needed. } /** * Override this function to actually implement the filtering. * * Filter developers must make sure that filtering done after text cleaning * does not introduce security vulnerabilities. * * @param string $text some HTML content to process. * @param array $options options passed to the filters * @return string the HTML content after the filtering has been applied. */ abstract public function filter($text, array $options = []); /** * Filter text before changing format to HTML. * * @param string $text * @param array $options * @return string */ public function filter_stage_pre_format(string $text, array $options): string { // NOTE: override if necessary. return $text; } /** * Filter HTML text before sanitising text. * * NOTE: this is called even if $options['noclean'] is true and text is not cleaned. * * @param string $text * @param array $options * @return string */ public function filter_stage_pre_clean(string $text, array $options): string { // NOTE: override if necessary. return $text; } /** * Filter HTML text at the very end after text is sanitised. * * NOTE: this is called even if $options['noclean'] is true and text is not cleaned. * * @param string $text * @param array $options * @return string */ public function filter_stage_post_clean(string $text, array $options): string { // NOTE: override if necessary. return $this->filter($text, $options); } /** * Filter simple text coming from format_string(). * * Note that unless $CFG->formatstringstriptags is disabled * HTML tags are not expected in returned value. * * @param string $text * @param array $options * @return string */ public function filter_stage_string(string $text, array $options): string { // NOTE: override if necessary. return $this->filter($text, $options); } } // Alias this class to the old name. // This file will be autoloaded by the legacyclasses autoload system. // In future all uses of this class will be corrected and the legacy references will be removed. class_alias(text_filter::class, \moodle_text_filter::class); home/smkb8269/public_html/lms.smk-almanshuriyah.sch.id/filter/tex/classes/text_filter.php000064400000020553152266515500025461 0ustar00. namespace filter_tex; use core\context\system as context_system; use core\exception\coding_exception; use core\output\actions\popup_action; use core\url; use core_useragent; use stdClass; /** * Moodle - Filter for converting TeX expressions to cached gif images * * This Moodle text filter converts TeX expressions delimited * by either $$...$$ or by ... tags to gif images using * mimetex.cgi obtained from http: *www.forkosh.com/mimetex.html authored by * John Forkosh john@forkosh.com. Several binaries of this areincluded with * this distribution. * Note that there may be patent restrictions on the production of gif images * in Canada and some parts of Western Europe and Japan until July 2004. * * @package filter_tex * @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 */ class text_filter extends \core_filters\text_filter { #[\Override] public function filter($text, array $options = []) { global $CFG, $DB; // Do a quick check using stripos to avoid unnecessary work. if ( (!preg_match('/ TeX expression // or TeX expression // or $$ TeX expression $$ // or \[ TeX expression \] // original tag of MathType and TeXaide // or [tex] TeX expression [/tex] // somtime it's more comfortable than . $rules = [ '(.+?)<\/tex>', '\$\$(.+?)\$\$', '\\\\\[(.+?)\\\\\]', '\\\\\((.+?)\\\\\)', '\\[tex\\](.+?)\\[\/tex\\]', ]; $megarule = '/' . implode('|', $rules) . '/is'; preg_match_all($megarule, $text, $matches); for ($i = 0; $i < count($matches[0]); $i++) { $texexp = ''; for ($j = 0; $j < count($rules); $j++) { $texexp .= $matches[$j + 2][$i]; } $alt = $matches[1][$i]; $texexp = str_replace('', '', $texexp); $texexp = str_replace('', '', $texexp); $texexp = str_replace('', '', $texexp); $texexp = str_replace('', '', $texexp); $texexp = preg_replace("//i", '', $texexp); $align = "middle"; if (preg_match('/^align=bottom /', $texexp)) { $align = "text-bottom"; $texexp = preg_replace('/^align=bottom /', '', $texexp); } else if (preg_match('/^align=top /', $texexp)) { $align = "text-top"; $texexp = preg_replace('/^align=top /', '', $texexp); } // Decode entities encoded by editor, luckily there is very little chance of double decoding. $texexp = html_entity_decode($texexp, ENT_QUOTES, 'UTF-8'); if ($texexp === '') { continue; } // Sanitize the decoded string, because $this->get_image_markup() injects the final string between script tags. $texexp = clean_param($texexp, PARAM_TEXT); $md5 = md5($texexp); if (!$DB->record_exists("cache_filters", ["filter" => "tex", "md5key" => $md5])) { $texcache = new stdClass(); $texcache->filter = 'tex'; $texcache->version = 1; $texcache->md5key = $md5; $texcache->rawtext = $texexp; $texcache->timemodified = time(); $DB->insert_record("cache_filters", $texcache, false); } $convertformat = get_config('filter_tex', 'convertformat'); if ($convertformat == 'svg' && !core_useragent::supports_svg()) { $convertformat = 'png'; } $filename = $md5 . ".{$convertformat}"; $text = str_replace($matches[0][$i], $this->get_image_markup($filename, $texexp, 0, 0, $align, $alt), $text); } return $text; } /** * Create image link. * * @param string $imagefile name of file * @param string $tex TeX notation (html entities already decoded) * @param int $height O means automatic * @param int $width O means automatic * @param string $align * @param string $alt * @return string HTML markup */ protected function get_image_markup( string $imagefile, string $tex, int $height, int $width, string $align, string $alt, ): string { global $CFG, $OUTPUT; if (!$imagefile) { throw new coding_exception('Image file argument empty in get_image_markup()'); } // Work out any necessary inline style. $rules = []; if ($align !== 'middle') { $rules[] = 'vertical-align:' . $align . ';'; } if ($height) { $rules[] = 'height:' . $height . 'px;'; } if ($width) { $rules[] = 'width:' . $width . 'px;'; } if (!empty($rules)) { $style = ' style="' . implode('', $rules) . '" '; } else { $style = ''; } // Prepare the title attribute. // Note that we retain the title tag as TeX format rather than using // the alt text, even if supplied. The alt text is intended for blind // users (to provide a text equivalent to the equation) while the title // is there as a convenience for sighted users who want to see the TeX // code. $title = 'title="' . s($tex) . '"'; if ($alt === '') { $alt = s($tex); } else { $alt = s(html_entity_decode($tex, ENT_QUOTES, 'UTF-8')); } // Build the output. $anchorcontents = "\"$alt\"slasharguments) { // Use this method if possible for better client-side caching. $anchorcontents .= "$CFG->wwwroot/filter/tex/pix.php/$imagefile"; } else { $anchorcontents .= "$CFG->wwwroot/filter/tex/pix.php?file=$imagefile"; } $anchorcontents .= "\" $style/>"; $imagefound = file_exists("$CFG->dataroot/filter/tex/$imagefile"); if (!$imagefound && has_capability('moodle/site:config', context_system::instance())) { $link = '/filter/tex/texdebug.php'; $action = null; } else { $link = new url('/filter/tex/displaytex.php', ['texexp' => $tex]); $action = new popup_action('click', $link, 'popup', ['width' => 320, 'height' => 240]); } // TODO: the popups do not work when text caching is enabled. $output = $OUTPUT->action_link($link, $anchorcontents, $action, ['title' => 'TeX']); $output = "$output"; return $output; } }