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<?php
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<?php
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// This file is part of Moodle - http://moodle.org/
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// This file is part of Moodle - http://moodle.org/
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//
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//
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// Moodle is free software: you can redistribute it and/or modify
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// Moodle 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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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// the Free Software Foundation, either version 3 of the License, or
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//
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//
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// You should have received a copy of the GNU General Public License
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// You should have received a copy of the GNU General Public License
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// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
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// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
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/**
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 * Filter converting emoticon texts into images
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 *
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/**
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 * This filter uses the emoticon settings in Site admin > Appearance > HTML settings
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 * and replaces emoticon texts with images.
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 * File only retained to prevent fatal errors in code that tries to require/include this.
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 *
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 *
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 * @package    filter
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 * @todo MDL-82708 delete this file as part of Moodle 6.0 development.
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 * @subpackage emoticon
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 * @deprecated This file is no longer required in Moodle 4.5+.
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 * @see        emoticon_manager
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 * @package filter_emoticon
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 * @copyright  2010 David Mudrak <david@moodle.com>
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 * @copyright David Mudrak <david@moodle.com>
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 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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 */
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 */
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defined('MOODLE_INTERNAL') || die();
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class filter_emoticon extends moodle_text_filter {
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    /**
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     * Internal cache used for replacing. Multidimensional array;
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     * - dimension 1: language,
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     * - dimension 2: theme.
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     * @var array
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     */
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    protected static $emoticontexts = array();
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    /**
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     * Internal cache used for replacing. Multidimensional array;
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     * - dimension 1: language,
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     * - dimension 2: theme.
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     * @var array
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     */
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    protected static $emoticonimgs = array();
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    /**
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     * Apply the filter to the text
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     *
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     * @see filter_manager::apply_filter_chain()
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     * @param string $text to be processed by the text
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     * @param array $options filter options
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     * @return string text after processing
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     */
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    public function filter($text, array $options = array()) {
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        if (!isset($options['originalformat'])) {
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            // if the format is not specified, we are probably called by {@see format_string()}
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            // in that case, it would be dangerous to replace text with the image because it could
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            // be stripped. therefore, we do nothing
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            return $text;
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        }
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        if (in_array($options['originalformat'], explode(',', get_config('filter_emoticon', 'formats')))) {
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            return $this->replace_emoticons($text);
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        }
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        return $text;
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    }
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    ////////////////////////////////////////////////////////////////////////////
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    // internal implementation starts here
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    ////////////////////////////////////////////////////////////////////////////
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    /**
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     * Replace emoticons found in the text with their images
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     *
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     * @param string $text to modify
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     * @return string the modified result
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     */
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    protected function replace_emoticons($text) {
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        global $CFG, $OUTPUT, $PAGE;
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        $lang = current_language();
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        $theme = $PAGE->theme->name;
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        if (!isset(self::$emoticontexts[$lang][$theme]) or !isset(self::$emoticonimgs[$lang][$theme])) {
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            // prepare internal caches
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            $manager = get_emoticon_manager();
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            $emoticons = $manager->get_emoticons();
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            self::$emoticontexts[$lang][$theme] = array();
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            self::$emoticonimgs[$lang][$theme] = array();
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            foreach ($emoticons as $emoticon) {
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                self::$emoticontexts[$lang][$theme][] = $emoticon->text;
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                self::$emoticonimgs[$lang][$theme][] = $OUTPUT->render($manager->prepare_renderable_emoticon($emoticon));
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            }
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            unset($emoticons);
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        }
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        if (empty(self::$emoticontexts[$lang][$theme])) { // No emoticons defined, nothing to process here.
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            return $text;
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        }
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        // Detect all zones that we should not handle (including the nested tags).
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        $processing = preg_split('/(<\/?(?:span|script|pre)[^>]*>)/is', $text, 0, PREG_SPLIT_DELIM_CAPTURE | PREG_SPLIT_NO_EMPTY);
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        // Initialize the results.
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        $resulthtml = "";
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        $exclude = 0;
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        // Define the patterns that mark the start of the forbidden zones.
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        $excludepattern = array('/^<script/is', '/^<span[^>]+class="nolink[^"]*"/is', '/^<pre/is');
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        // Loop through the fragments.
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        foreach ($processing as $fragment) {
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            // If we are not ignoring, we MUST test if we should.
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            if ($exclude == 0) {
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                foreach ($excludepattern as $exp) {
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                    if (preg_match($exp, $fragment)) {
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                        $exclude = $exclude + 1;
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                        break;
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                    }
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                }
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            }
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            if ($exclude > 0) {
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                // If we are ignoring the fragment, then we must check if we may have reached the end of the zone.
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                if (strpos($fragment, '</span') !== false || strpos($fragment, '</script') !== false
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                    || strpos($fragment, '</pre') !== false) {
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                    $exclude -= 1;
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                    // This is needed because of a double increment at the first element.
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                    if ($exclude == 1) {
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                        $exclude -= 1;
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                    }
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                } else if (strpos($fragment, '<span') !== false || strpos($fragment, '<script') !== false
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                    || strpos($fragment, '<pre') !== false) {
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                    // If we find a nested tag we increase the exclusion level.
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                    $exclude = $exclude + 1;
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                }
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            } else if (strpos($fragment, '<span') === false ||
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                       strpos($fragment, '</span') === false) {
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defined('MOODLE_INTERNAL') || die();
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                // This is the meat of the code - this is run every time.
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                // This code only runs for fragments that are not ignored (including the tags themselves).
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                $fragment = str_replace(self::$emoticontexts[$lang][$theme], self::$emoticonimgs[$lang][$theme], $fragment);
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            }
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            $resulthtml .= $fragment;
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        }
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        return $resulthtml;
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