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<?php |
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/* |
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Plugin Name: Advanced Excerpt |
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Plugin URI: http://sparepencil.com/code/advanced-excerpt/ |
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Description: Several improvements over WP's default excerpt. The size of the excerpt can be limited using character or word count, and HTML markup is not removed. |
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Version: 3.0 |
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Author: Bas van Doren |
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Author URI: http://sparepencil.com/ |
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|
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Copyright 2007 Bas van Doren |
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|
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This program 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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the Free Software Foundation; either version 3 of the License, or |
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(at your option) any later version. |
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|
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This program is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU General Public License for more details. |
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|
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You should have received a copy of the GNU General Public License |
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along with this program. If not, see <http://www.gnu.org/licenses/>. |
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*/ |
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|
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if(!class_exists('AdvancedExcerpt')) : |
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class AdvancedExcerpt |
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{ |
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// Plugin configuration |
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var $name; |
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var $text_domain; |
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var $mb; |
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|
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var $default_options; |
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var $custom_options; |
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|
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// Tricky variable |
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var $skip_next_call; |
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|
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// Reference arrays |
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// Basic HTML tags (determines which tags are in the checklist) |
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var $options_basic_tags = array( |
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'a', 'abbr', 'acronym', |
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'b', 'big', 'blockquote', 'br', |
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'center', 'cite', 'code', |
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'dd', 'del', 'div', 'dl', 'dt', |
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'em', |
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'form', |
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'h1', 'h2', 'h3', 'h4', 'h5', 'h6', 'hr', |
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'i', 'img', 'ins', |
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'li', |
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'ol', |
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'p', 'pre', |
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'q', |
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's', 'small', 'span', 'strike', 'strong', 'sub', 'sup', |
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'table', 'td', 'th', 'tr', |
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'u', 'ul' |
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); |
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|
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// HTML tags allowed in <body> |
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// <style> is <head>-only, but usage is often non-standard, so it's included here |
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var $options_body_tags = array( |
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'a', 'abbr', 'acronym', 'address', 'applet', 'area', |
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'b', 'bdo', 'big', 'blockquote', 'br', 'button', |
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'caption', 'center', 'cite', 'code', 'col', 'colgroup', |
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'dd', 'del', 'dfn', 'dir', 'div', 'dl', 'dt', |
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'em', |
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'fieldset', 'font', 'form', 'frame', 'frameset', |
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'h1', 'h2', 'h3', 'h4', 'h5', 'h6', 'hr', |
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'i', 'iframe', 'img', 'input', 'ins', 'isindex', |
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'kbd', |
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'label', 'legend', 'li', |
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'map', 'menu', |
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'noframes', 'noscript', |
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'object', 'ol', 'optgroup', 'option', |
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'p', 'param', 'pre', |
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'q', |
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's', 'samp', 'script', 'select', 'small', 'span', 'strike', 'strong', 'style', 'sub', 'sup', |
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'table', 'tbody', 'td', 'textarea', 'tfoot', 'th', 'thead', 'tr', 'tt', |
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'u', 'ul', |
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'var' |
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); |
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|
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// (not used) HTML tags which may have content that should not be considered actual text |
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// TODO: Implement a way to remove tag + content if tag is not allowed (low priority) |
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var $non_text_tags = array( |
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'applet', 'noframes', 'noscript', 'object', 'select', 'script', 'style' |
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); |
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|
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|
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function AdvancedExcerpt() |
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{ |
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$this->name = strtolower(get_class($this)); |
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$this->text_domain = $this->name; |
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$this->skip_next_call = false; |
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$this->charset = get_bloginfo('charset'); |
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|
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$this->load_options(); |
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|
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// Carefully support multibyte languages |
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if(extension_loaded('mbstring') && function_exists('mb_list_encodings')) |
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$this->mb = in_array($this->charset, mb_list_encodings()); |
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|
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load_plugin_textdomain($this->text_domain, PLUGINDIR . '/advanced-excerpt/'); |
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|
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register_activation_hook(__FILE__, array(&$this, 'install')); |
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|
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//register_deactivation_hook(__FILE__, array(&$this, 'uninstall')); |
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|
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add_action('admin_menu', array(&$this, 'add_pages')); |
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|
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// Replace the default filter (see /wp-includes/default-filters.php) |
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remove_filter('get_the_excerpt', 'wp_trim_excerpt'); |
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add_filter('get_the_excerpt', array(&$this, 'filter')); |
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} |
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|
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function __construct() |
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{ |
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self::AdvancedExcerpt(); |
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} |
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|
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function filter($text) |
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{ |
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// Merge custom parameters |
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if(is_array($this->custom_options)) |
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$r = array_merge($this->custom_options, $this->default_options); |
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else |
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$r = $this->default_options; |
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|
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extract($r, EXTR_SKIP); |
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|
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// Only make the excerpt if it does not exist or 'No Custom Excerpt' is set to true |
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if('' == $text || $no_custom) |
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{ |
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// Get the full content and filter it |
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$text = get_the_content(''); |
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if(1 == $no_shortcode) |
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$text = strip_shortcodes($text); |
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$text = apply_filters('the_content', $text); |
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|
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// From the default wp_trim_excerpt(): |
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// Some kind of precaution against malformed CDATA in RSS feeds I suppose |
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$text = str_replace(']]>', ']]>', $text); |
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|
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// Strip HTML if allow-all is not set |
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if(!in_array('_all', $allowed_tags)) |
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{ |
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if(count($allowed_tags) > 0) |
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$tag_string = '<' . implode('><', $allowed_tags) . '>'; |
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else |
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$tag_string = ''; |
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$text = strip_tags($text, $tag_string); |
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} |
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|
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if(1 == $use_words) |
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{ |
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// Words |
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|
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// Skip if text is already within limit |
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if($length >= count(preg_split('/[\s]+/', strip_tags($text)))) |
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return $text; |
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|
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// Split on whitespace and start counting (for real) |
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$text_bits = preg_split('/([\s]+)/', $text, -1, PREG_SPLIT_DELIM_CAPTURE | PREG_SPLIT_NO_EMPTY); |
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$in_tag = false; |
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$n_words = 0; |
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$text = ''; |
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foreach($text_bits as $chunk) |
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{ |
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if(!in_tag || strpos($chunk, '>') !== false) |
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$in_tag = (strrpos($chunk, '>') < strrpos($chunk, '<')); |
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|
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// Whitespace outside tags is word separator |
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if(!$in_tag && '' == trim($chunk)) |
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$n_words++; |
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|
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if($n_words >= $length && !$in_tag) |
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break; |
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|
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$text .= $chunk; |
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} |
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} |
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else |
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{ |
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// Characters |
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|
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// Count characters, not whitespace, not those belonging to HTML tags |
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if($length > $this->strlen(strip_tags($text))) |
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return $text; |
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|
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$in_tag = false; |
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$n_chars = 0; |
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for($i = 0; $n_chars < $length || $in_tag; $i++) |
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{ |
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// TODO: Improve this loop |
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|
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$char = $this->substr($text, $i, 1); |
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// Is the character worth counting (ie. not part of an HTML tag) |
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if($char == '<') |
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$in_tag = true; |
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elseif($char == '>') |
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$in_tag = false; |
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elseif(!$in_tag && '' != trim($char)) |
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$n_chars++; |
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|
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// Prevent eternal loops (this could happen with incomplete HTML tags) |
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if($i >= $this->strlen($text) - 1) |
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break; |
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} |
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$text = $this->substr($text, 0, $i); |
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} |
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$text = force_balance_tags($text); |
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|
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// New filter in WP2.9, seems unnecessary for now |
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//$ellipsis = apply_filters('excerpt_more', $ellipsis); |
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|
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// Read more |
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if(1 == $add_link) |
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{ |
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$ellipsis = $ellipsis . sprintf(' <a href="%s" class="read_more">%s</a>', get_permalink(), $read_more); |
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} |
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|
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// Adding the ellipsis |
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if(($pos = strpos($text, '</p>', strlen($text) - 6)) !== false) |
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{ |
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// Stay inside the last paragraph (if it's in the last 6 characters) |
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$text = substr_replace($text, $ellipsis, $pos, 0); |
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} |
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else |
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{ |
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// If <p> is an allowed tag, |
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// wrap the ellipsis for consistency with excerpt markup |
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if(in_array('_all', $allowed_tags) || in_array('p', $allowed_tags)) |
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$ellipsis = '<p>' . $ellipsis . '</p>'; |
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|
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$text = $text . $ellipsis; |
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} |
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} |
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|
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return $text; |
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} |
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|
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function install() |
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{ |
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add_option($this->name . '_length', 40); |
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add_option($this->name . '_use_words', 1); |
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add_option($this->name . '_no_custom', 0); |
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add_option($this->name . '_no_shortcode', 1); |
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add_option($this->name . '_ellipsis', '…'); |
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add_option($this->name . '_read_more', 'Read the rest'); |
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add_option($this->name . '_add_link', 0); |
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add_option($this->name . '_allowed_tags', $this->options_basic_tags); |
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|
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//$this->load_options(); |
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} |
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|
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function uninstall() |
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{ |
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// Nothing to do (note: deactivation hook is also disabled) |
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} |
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|
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function load_options() |
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{ |
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$this->default_options = array( |
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'length' => get_option($this->name . '_length'), |
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'use_words' => get_option($this->name . '_use_words'), |
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'no_custom' => get_option($this->name . '_no_custom'), |
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'no_shortcode' => get_option($this->name . '_no_shortcode'), |
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'ellipsis' => get_option($this->name . '_ellipsis'), |
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'read_more' => get_option($this->name . '_read_more'), |
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'add_link' => get_option($this->name . '_add_link'), |
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'allowed_tags' => get_option($this->name . '_allowed_tags') |
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); |
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} |
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|
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|
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function update_options() |
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{ |
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$length = (int) $_POST[$this->name . '_length']; |
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$use_words = ('on' == $_POST[$this->name . '_use_words']) ? 1 : 0 ; |
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$no_custom = ('on' == $_POST[$this->name . '_no_custom']) ? 1 : 0 ; |
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$no_shortcode = ('on' == $_POST[$this->name . '_no_shortcode']) ? 1 : 0 ; |
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$add_link = ('on' == $_POST[$this->name . '_add_link']) ? 1 : 0 ; |
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|
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$ellipsis = (get_magic_quotes_gpc() == 1) ? stripslashes($_POST[$this->name . '_ellipsis']) : $_POST[$this->name . '_ellipsis']; |
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$read_more = (get_magic_quotes_gpc() == 1) ? stripslashes($_POST[$this->name . '_read_more']) : $_POST[$this->name . '_read_more']; |
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|
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$allowed_tags = array_unique((array) $_POST[$this->name . '_allowed_tags']); |
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|
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update_option($this->name . '_length', $length); |
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update_option($this->name . '_use_words', $use_words); |
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update_option($this->name . '_no_custom', $no_custom); |
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update_option($this->name . '_no_shortcode', $no_shortcode); |
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update_option($this->name . '_ellipsis', $ellipsis); |
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update_option($this->name . '_read_more', $read_more); |
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update_option($this->name . '_add_link', $add_link); |
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update_option($this->name . '_allowed_tags', $allowed_tags); |
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|
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$this->load_options(); |
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?> |
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<div id="message" class="updated fade"><p>Options saved.</p></div> |
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<?php |
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} |
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|
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function page_options() |
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{ |
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if ('POST' == $_SERVER['REQUEST_METHOD']) |
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{ |
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check_admin_referer($this->name . '_update_options'); |
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$this->update_options(); |
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} |
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|
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extract($this->default_options, EXTR_SKIP); |
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|
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// HTML entities for textbox |
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$ellipsis = htmlentities($ellipsis); |
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$read_more = htmlentities($read_more); |
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|
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// Basic tags + enabled tags |
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$tag_list = $this->set_union($this->options_basic_tags, $allowed_tags); |
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sort($tag_list); |
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$tag_cols = 5; |
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?> |
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<div class="wrap"> |
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<div id="icon-options-general" class="icon32"><br /></div> |
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<h2><?php _e("Advanced Excerpt Options", $this->text_domain); ?></h2> |
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<form method="post" action=""> |
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<?php |
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if ( function_exists('wp_nonce_field') ) |
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wp_nonce_field($this->name . '_update_options'); ?> |
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|
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<table class="form-table"> |
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<tr valign="top"> |
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<th scope="row"><label for="<?php echo $this->name ?>_length"><?php _e("Excerpt Length:", $this->text_domain); ?></label></th> |
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<td> |
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<input name="<?php echo $this->name ?>_length" type="text" id="<?php echo $this->name ?>_length" value="<?php echo $length; ?>" size="2" /> |
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<input name="<?php echo $this->name ?>_use_words" type="checkbox" id="<?php echo $this->name ?>_use_words" value="on" <?php echo (1 == $use_words) ? 'checked="checked" ': ''; ?>/> <?php _e("Use words?", $this->text_domain); ?> |
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</td> |
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</tr> |
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<tr valign="top"> |
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<th scope="row"><label for="<?php echo $this->name ?>_ellipsis"><?php _e("Ellipsis:", $this->text_domain); ?></label></th> |
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<td> |
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<input name="<?php echo $this->name ?>_ellipsis" type="text" id="<?php echo $this->name ?>_ellipsis" value="<?php echo $ellipsis; ?>" size="5" /> <?php _e('(use <a href="http://www.w3schools.com/tags/ref_entities.asp">HTML entities</a>)', $this->text_domain); ?> |
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<br /> |
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<?php _e("Will substitute the part of the post that is omitted in the excerpt.", $this->text_domain); ?> |
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</td> |
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</tr> |
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<tr valign="top"> |
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<th scope="row"><label for="<?php echo $this->name ?>_read_more"><?php _e("‘Read-more’ Text:", $this->text_domain); ?></label></th> |
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<td> |
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<input name="<?php echo $this->name ?>_read_more" type="text" id="<?php echo $this->name ?>_read_more" value="<?php echo $read_more; ?>" /> |
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<input name="<?php echo $this->name ?>_add_link" type="checkbox" id="<?php echo $this->name ?>_add_link" value="on" <?php echo (1 == $add_link) ? 'checked="checked" ': ''; ?>/> <?php _e("Add link to excerpt", $this->text_domain); ?> |
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</td> |
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</tr> |
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<tr valign="top"> |
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<th scope="row"><label for="<?php echo $this->name ?>_no_custom"><?php _e("No Custom Excerpts:", $this->text_domain); ?></label></th> |
| 357 |
<td> |
| 358 |
<input name="<?php echo $this->name ?>_no_custom" type="checkbox" id="<?php echo $this->name ?>_no_custom" value="on" <?php echo (1 == $no_custom) ? 'checked="checked" ': ''; ?>/> |
| 359 |
<?php _e("Generate excerpts even if a post has a custom excerpt attached.", $this->text_domain); ?> |
| 360 |
</td> |
| 361 |
</tr> |
| 362 |
<tr valign="top"> |
| 363 |
<th scope="row"><label for="<?php echo $this->name ?>_no_shortcode"><?php _e("Strip Shortcodes:", $this->text_domain); ?></label></th> |
| 364 |
<td> |
| 365 |
<input name="<?php echo $this->name ?>_no_shortcode" type="checkbox" id="<?php echo $this->name ?>_no_shortcode" value="on" <?php echo (1 == $no_shortcode) ? 'checked="checked" ': ''; ?>/> |
| 366 |
<?php _e("Remove shortcodes from the excerpt. <em>(recommended)</em>", $this->text_domain); ?> |
| 367 |
</td> |
| 368 |
</tr> |
| 369 |
<tr valign="top"> |
| 370 |
<th scope="row"><?php _e("Keep Markup:", $this->text_domain); ?></th> |
| 371 |
<td> |
| 372 |
<table id="<?php echo $this->name ?>_tags_table"> |
| 373 |
<tr> |
| 374 |
<td colspan="<?php echo $tag_cols; ?>"> |
| 375 |
<input name="<?php echo $this->name ?>_allowed_tags[]" type="checkbox" value="_all" <?php echo (in_array('_all', $allowed_tags)) ? 'checked="checked" ': ''; ?>/> |
| 376 |
<?php _e("Don't remove any markup", $this->text_domain); ?> |
| 377 |
</td> |
| 378 |
</tr> |
| 379 |
<?php |
| 380 |
$i = 0; |
| 381 |
foreach($tag_list as $tag) : |
| 382 |
if($tag == '_all') continue; |
| 383 |
if(0 == $i % $tag_cols) : ?> |
| 384 |
<tr> |
| 385 |
<?php |
| 386 |
endif; |
| 387 |
$i++; |
| 388 |
?> |
| 389 |
<td> |
| 390 |
<input name="<?php echo $this->name ?>_allowed_tags[]" type="checkbox" value="<?php echo $tag; ?>" <?php echo (in_array($tag, $allowed_tags)) ? 'checked="checked" ': ''; ?>/> |
| 391 |
<code><?php echo $tag; ?></code> |
| 392 |
</td> |
| 393 |
<?php |
| 394 |
if(0 == $i % $tag_cols) : $i = 0; ?> |
| 395 |
</tr> |
| 396 |
<?php |
| 397 |
endif; |
| 398 |
endforeach; |
| 399 |
if(0 != $i % $tag_cols) : ?><td colspan="<?php echo ($tag_cols - $i); ?>"> </td></tr><?php endif;?> |
| 400 |
</table> |
| 401 |
<a href="" id="<?php echo $this->name ?>_select_all">Select all</a> / <a href="" id="<?php echo $this->name ?>_select_none">Select none</a><br /> |
| 402 |
More tags: |
| 403 |
<select name="<?php echo $this->name ?>_more_tags" id="<?php echo $this->name ?>_more_tags"> |
| 404 |
<?php |
| 405 |
foreach($this->options_body_tags as $tag) : |
| 406 |
?> |
| 407 |
<option value="<?php echo $tag; ?>"><?php echo $tag; ?></option> |
| 408 |
<?php |
| 409 |
endforeach; |
| 410 |
?> |
| 411 |
</select> |
| 412 |
<input type="button" name="<?php echo $this->name ?>_add_tag" id="<?php echo $this->name ?>_add_tag" class="button" value="Add tag" /> |
| 413 |
</td> |
| 414 |
</tr> |
| 415 |
</table> |
| 416 |
<p class="submit"><input type="submit" name="Submit" class="button-primary" value="<?php _e("Save Changes", $this->text_domain); ?>" /></p> |
| 417 |
</form> |
| 418 |
</div> |
| 419 |
<?php |
| 420 |
} |
| 421 |
|
| 422 |
function page_script() |
| 423 |
{ |
| 424 |
wp_enqueue_script($this->name . '_script', WP_PLUGIN_URL . '/advanced-excerpt/advanced-excerpt.js', array('jquery')); |
| 425 |
} |
| 426 |
|
| 427 |
function add_pages() |
| 428 |
{ |
| 429 |
$options_page = add_options_page(__("Advanced Excerpt Options", $this->text_domain), __("Excerpt", $this->text_domain), 'manage_options', 'options-' . $this->name, array(&$this, 'page_options')); |
| 430 |
|
| 431 |
// Scripts |
| 432 |
add_action('admin_print_scripts-' . $options_page, array(&$this, 'page_script')); |
| 433 |
} |
| 434 |
|
| 435 |
// Careful multibyte support (fallback to normal functions if not available) |
| 436 |
|
| 437 |
function substr($str, $start, $length = null) |
| 438 |
{ |
| 439 |
$length = (is_null($length)) ? $this->strlen($str) : $length; |
| 440 |
if($this->mb) |
| 441 |
return mb_substr($str, $start, $length, $this->charset); |
| 442 |
else |
| 443 |
return substr($str, $start, $length); |
| 444 |
} |
| 445 |
|
| 446 |
function strlen($str) |
| 447 |
{ |
| 448 |
if($this->mb) |
| 449 |
return mb_strlen($str, $this->charset); |
| 450 |
else |
| 451 |
return strlen($str); |
| 452 |
} |
| 453 |
|
| 454 |
// Some utility functions |
| 455 |
|
| 456 |
function set_complement($a, $b) |
| 457 |
{ |
| 458 |
$c = array_diff($a, $b); |
| 459 |
return array_unique($c); |
| 460 |
} |
| 461 |
|
| 462 |
function set_union($a, $b) |
| 463 |
{ |
| 464 |
$c = array_merge($a, $b); |
| 465 |
return array_unique($c); |
| 466 |
} |
| 467 |
} |
| 468 |
|
| 469 |
$advancedexcerpt = new AdvancedExcerpt(); |
| 470 |
|
| 471 |
// Do not use outside the Loop! |
| 472 |
function the_advanced_excerpt($args = '', $get = true) |
| 473 |
{ |
| 474 |
global $advancedexcerpt; |
| 475 |
|
| 476 |
$r = wp_parse_args($args); |
| 477 |
|
| 478 |
if(isset($r['ellipsis'])) |
| 479 |
$r['ellipsis'] = urldecode($r['ellipsis']); |
| 480 |
|
| 481 |
// TODO: Switch to 'allowed_tags' (compatibility code) |
| 482 |
if(isset($r['allow_tags'])) |
| 483 |
{ |
| 484 |
$r['allowed_tags'] = $r['allow_tags']; |
| 485 |
unset($r['allow_tags']); |
| 486 |
} |
| 487 |
|
| 488 |
if(isset($r['allowed_tags'])) |
| 489 |
$r['allowed_tags'] = preg_split('/[\s,]+/', $r['allow_tags']); |
| 490 |
|
| 491 |
if(isset($r['exclude_tags'])) |
| 492 |
{ |
| 493 |
$r['exclude_tags'] = preg_split('/[\s,]+/', $r['exclude_tags']); |
| 494 |
// {all_tags} - {exclude_tags} |
| 495 |
$r['allowed_tags'] = $advancedexcerpt->set_complement($advancedexcerpt->options_body_tags, $r['exclude_tags']); |
| 496 |
unset($r['exclude_tags']); |
| 497 |
} |
| 498 |
|
| 499 |
// Set custom options (discard after use) |
| 500 |
$advancedexcerpt->custom_options = $r; |
| 501 |
if($get) |
| 502 |
echo get_the_excerpt(); |
| 503 |
else |
| 504 |
the_excerpt(); |
| 505 |
$advancedexcerpt->custom_options = null; |
| 506 |
} |
| 507 |
endif; |
