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<?php
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/**
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* @file
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* Provides the Highlight JS filter.
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*
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* @author Juned Kazi
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*/
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/**
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* Implement hook_filter_info().
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*/
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function highlight_js_filter_filter_info() {
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$filters['highlight_js'] = array(
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'title' => t('Highlight JS Filter'),
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'description' => t('Allows users to post code verbatim using <code> and <?php ?> tags.'),
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'prepare callback' => '_highlight_js_filter_prepare',
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'process callback' => '_highlight_js_filter_process',
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'tips callback' => '_highlight_js_filter_tips',
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'cache' => TRUE,
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);
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return $filters;
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}
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/**
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* Tips callback for Highlight JS filter.
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*/
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function _highlight_js_filter_tips($format, $long = FALSE) {
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if ($long) {
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return t('To post pieces of code, surround them with <code>...</code> tags.');
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}
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else {
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return t('You may post code using <code>...</code> (generic) tags.');
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}
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}
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/**
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* Prepare callback for Highlight JS filter.
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*/
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function _highlight_js_filter_prepare($text) {
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$text = preg_replace_callback('@^<\?php(.+?)\?>@sm', '_highlight_js_filter_escape_code_tag_callback', $text);
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$text = preg_replace_callback('@^<code>(.+?)</code>@sm', '_highlight_js_filter_escape_code_tag_callback', $text);
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$text = preg_replace_callback('@^<code class="(.+?)">(.+?)</code>@sm', '_highlight_js_filter_escape_code_tag_lang_callback', $text);
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return $text;
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}
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/**
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* Callback to escape content of <code> elements.
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*/
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function _highlight_js_filter_escape_code_tag_callback($matches) {
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return highlight_js_filter_escape($matches[1], 'code');
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}
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/**
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* Callback to escape content of <code lang="php"> elements.
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*/
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function _highlight_js_filter_escape_code_tag_lang_callback($matches) {
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return highlight_js_filter_escape($matches[2], 'code', $matches[1]);
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}
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/**
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* Escape code blocks during input filter 'prepare'.
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*
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* @param $text
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* The string to escape.
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* @param $type
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* The type of code block, either 'code' or 'php'.
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* @return
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* The escaped string.
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*/
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function highlight_js_filter_escape($text, $type = 'code', $lang = '') {
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// Note, pay attention to odd preg_replace-with-/e behaviour on slashes
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$text = check_plain(str_replace('\"', '"', $text));
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// Protect newlines from line break converter
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$text = str_replace(array("\r", "\n"), array('', ' '), $text);
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$lang = empty($lang) ? '' : ' class="' . $lang . '"';
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// Add codefilter escape tags
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$text = "[highlightjs_$type$lang]{$text}[/highlightjs_$type]";
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return $text;
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}
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function _highlight_js_filter_process($text, $format) {
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$text = preg_replace_callback('@\[highlightjs_code\](.+?)\[/highlightjs_code\]@s', '_highlight_js_filter_process_code_callback', $text);
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$text = preg_replace_callback('@\[highlightjs_code class="(.+?)"\](.+?)\[/highlightjs_code\]@s', '_highlight_js_filter_process_code_lang_callback', $text);
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return $text;
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}
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/**
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* Callback to replace content of the <code> elements.
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*/
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function _highlight_js_filter_process_code_callback($matches) {
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return highlight_js_filter_process_code($matches[1]);
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}
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/**
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* Callback to replace content of the <code> elements.
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*/
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function _highlight_js_filter_process_code_lang_callback($matches) {
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$lang = $matches[1];
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$text = $matches[2];
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return highlight_js_filter_process_code($text, $lang);
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}
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/**
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* Processes chunks of escaped code into HTML.
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*/
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function highlight_js_filter_process_code($text, $lang = '') {
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// Undo linebreak escaping
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$text = str_replace(' ', "\n", $text);
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// Inline or block level piece?
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$multiline = strpos($text, "\n") !== FALSE;
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// Note, pay attention to odd preg_replace-with-/e behaviour on slashes
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$text = preg_replace("/^\n/", '', preg_replace('@</?(br|p)\s*/?>@', '', str_replace('\"', '"', $text)));
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// Trim leading and trailing linebreaks
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$text = trim($text, "\n");
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$class = empty($lang) ? '' : ' class="' . $lang . '"';
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$text = '<pre><code' . $class . '>' . highlight_js_filter_fix_spaces(str_replace(' ', ' ', $text)) . '</code></pre>';
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return $text;
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}
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function highlight_js_filter_fix_spaces($text) {
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return preg_replace('@ (?! )@', ' ', $text);
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}
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