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<?php
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// $Id: url_replace_filter.module,v 1.1.2.2 2007/08/14 03:02:53 davidlesieur Exp $
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/**
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* Implementation of hook_filter().
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*/
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function url_replace_filter_filter($op, $delta = 0, $format = -1, $text = '') {
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switch ($op) {
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case 'list':
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return array(0 => t('URL Replace Filter'));
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case 'description':
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return t('Allows administrators to replace the base URL in <img> and <a> elements.');
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case 'settings':
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return _url_replace_filter_settings($format);
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case 'process':
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$text = _url_replace_filter_process($text, $format);
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return $text;
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default:
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return $text;
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}
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}
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/**
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* Filter the given text.
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*/
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function _url_replace_filter_process($text, $format) {
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$settings = _url_replace_filter_get_settings($format);
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foreach ($settings as $index => $setting) {
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if ($setting['original']) {
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$pattern = '!((<a\s[^>]*href)|(<img\s[^>]*src))\s*=\s*"'. preg_quote($setting['original']) .'!iU';
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if (preg_match_all($pattern, $text, $matches)) {
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$replacement = str_replace('%baseurl', rtrim(base_path(), '/'), $setting['replacement']);
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foreach ($matches[0] as $key => $match) {
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$text = str_replace($match, $matches[1][$key] .'="'. $replacement, $text);
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}
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}
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}
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}
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return $text;
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}
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/**
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* Settings for the HTML filter.
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*/
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function _url_replace_filter_settings($format) {
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$form['#tree'] = TRUE;
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$form['url_replace_filter_'. $format] = array(
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'#type' => 'fieldset',
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'#title' => t('URL Replace Filter'),
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'#collapsible' => TRUE,
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'#collapsed' => FALSE,
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'#theme' => 'url_replace_filter_settings_form',
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);
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$settings = _url_replace_filter_get_settings($format);
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foreach ($settings as $index => $setting) {
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_url_replace_filter_row_form($form, $format, $index, $setting['original'], $setting['replacement']);
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if (!$setting['original']) {
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$empty++;
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}
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}
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// Append some empty fields
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while ($empty < 3) {
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$index++;
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$empty++;
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_url_replace_filter_row_form($form, $format, $index, '', '');
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}
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return $form;
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}
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function _url_replace_filter_row_form(&$form, $format, $index, $original, $replacement) {
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$form['url_replace_filter_'. $format][$index]['original'] = array(
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'#type' => 'textfield',
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'#size' => 50,
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'#default_value' => $original,
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);
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$form['url_replace_filter_'. $format][$index]['replacement'] = array(
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'#type' => 'textfield',
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'#size' => 50,
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'#default_value' => $replacement,
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);
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}
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function _url_replace_filter_get_settings($format) {
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return variable_get('url_replace_filter_'. $format, array(0 => array('original' => '', 'replacement' => '')));
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}
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function theme_url_replace_filter_settings_form(&$form) {
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$header = array(t('Original'), t('Replacement'));
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foreach (element_children($form) as $index) {
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$row = array();
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foreach (element_children($form[$index]) as $key) {
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$row[] = drupal_render($form[$index][$key]);
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}
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$rows[] = $row;
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}
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$output .= '<p>'. t('This filter allows you to replace the base URL in <img> and <a> elements.') .'</p>';
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$output .= theme('table', $header, $rows);
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$output .= t('<p>Enter original base URLs and their replacements. Matching is case-insensitive. You may use %baseurl in the replacement string to insert your site\'s base URL (without the trailing slash).</p><p><strong>Warning</strong>: To avoid unexpected results, you must include trailing slashes in both the original and replacement strings.</p><p><strong>Warning</strong>: Replacements are executed in the order you give them. Place the most specific URLs first. For example, <em>http://example.com/somepath/</em> should be replaced before <em>http://example.com/</em>.</p><p>If you need more replacement rules, more fields will be added after saving the settings.</p>');
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$output .= drupal_render($form);
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return $output;
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}
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