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<?php |
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/* |
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Plugin Name: Advanced Excerpt |
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Plugin URI: http://basvd.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: 4.1 |
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Author: Bas van Doren |
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Author URI: http://basvd.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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public $name; |
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public $text_domain; |
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public $options; |
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public $default_options = array( |
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'length' => 40, |
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'use_words' => 1, |
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'no_custom' => 1, |
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'no_shortcode' => 1, |
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'finish_word' => 0, |
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'finish_sentence' => 0, |
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'ellipsis' => '…', |
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'read_more' => 'Read the rest', |
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'add_link' => 0, |
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'allowed_tags' => array('_all') |
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); |
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|
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// Basic HTML tags (determines which tags are in the checklist by default) |
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public static $options_basic_tags = array |
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( |
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'a', 'abbr', 'acronym', 'b', 'big', |
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'blockquote', 'br', 'center', 'cite', 'code', 'dd', 'del', 'div', 'dl', 'dt', |
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'em', 'form', 'h1', 'h2', 'h3', 'h4', 'h5', 'h6', 'hr', 'i', 'img', 'ins', |
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'li', 'ol', 'p', 'pre', 'q', 's', 'small', 'span', 'strike', 'strong', 'sub', |
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'sup', 'table', 'td', 'th', 'tr', 'u', 'ul' |
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); |
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|
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// Almost all HTML tags (extra options) |
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public static $options_all_tags = array( |
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'a', 'abbr', 'acronym', 'address', 'applet', |
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'area', 'b', 'bdo', 'big', 'blockquote', 'br', 'button', 'caption', 'center', |
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'cite', 'code', 'col', 'colgroup', 'dd', 'del', 'dfn', 'dir', 'div', 'dl', |
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'dt', 'em', 'fieldset', 'font', 'form', 'frame', 'frameset', 'h1', 'h2', 'h3', |
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'h4', 'h5', 'h6', 'hr', 'i', 'iframe', 'img', 'input', 'ins', 'isindex', 'kbd', |
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'label', 'legend', 'li', 'map', 'menu', 'noframes', 'noscript', 'object', |
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'ol', 'optgroup', 'option', 'p', 'param', 'pre', 'q', 's', 'samp', 'script', |
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'select', 'small', 'span', 'strike', 'strong', 'style', 'sub', 'sup', 'table', |
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'tbody', 'td', 'textarea', 'tfoot', 'th', 'thead', 'tr', 'tt', 'u', 'ul', |
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'var' |
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); |
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|
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// Singleton |
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private static $inst = null; |
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public static function Instance($new = false) |
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{ |
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if (self::$inst == null || $new) |
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{ |
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self::$inst = new AdvancedExcerpt(); |
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} |
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return self::$inst; |
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} |
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|
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private function __construct() |
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{ |
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$this->name = strtolower(get_class()); |
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$this->text_domain = $this->name; |
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$this->load_options(); |
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|
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load_plugin_textdomain($this->text_domain, false, dirname(plugin_basename(__FILE__))); |
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register_activation_hook(__FILE__, array( |
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&$this, |
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'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( |
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&$this, |
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'add_pages' |
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)); |
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|
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// Replace the default filter (see /wp-includes/default-filters.php) |
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//remove_filter('get_the_excerpt', 'wp_trim_excerpt'); |
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// Replace everything |
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remove_all_filters('get_the_excerpt'); |
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add_filter('get_the_excerpt', array( |
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&$this, |
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'filter' |
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)); |
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} |
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|
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public function filter($text) |
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{ |
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// Extract options (skip collisions) |
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if (is_array($this->options)) |
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{ |
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extract($this->options, EXTR_SKIP); |
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$this->options = null; // Reset |
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} |
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extract($this->default_options, EXTR_SKIP); |
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|
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// Avoid custom excerpts |
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if (!empty($text) && !$no_custom) |
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return $text; |
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|
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// Get the full content and filter it |
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$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(']]>', ']]>', $text); |
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|
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// Determine allowed tags |
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if(!isset($allowed_tags)) |
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$allowed_tags = self::$options_all_tags; |
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|
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if(isset($exclude_tags)) |
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$allowed_tags = array_diff($allowed_tags, $exclude_tags); |
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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, $tag_string); |
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} |
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|
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// Create the excerpt |
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$text = $this->text_excerpt($text, $length, $use_words, $finish_word, $finish_sentence); |
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|
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// Add the ellipsis or link |
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$text = $this->text_add_more($text, $ellipsis, ($add_link) ? $read_more : false); |
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|
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return $text; |
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} |
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|
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public function text_excerpt($text, $length, $use_words, $finish_word, $finish_sentence) |
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{ |
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$tokens = array(); |
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$out = ''; |
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$w = 0; |
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|
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// Divide the string into tokens; HTML tags, or words, followed by any whitespace |
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// (<[^>]+>|[^<>\s]+\s*) |
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preg_match_all('/(<[^>]+>|[^<>\s]+)\s*/u', $text, $tokens); |
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foreach ($tokens[0] as $t) |
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{ // Parse each token |
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if ($w >= $length && !$finish_sentence) |
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{ // Limit reached |
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break; |
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} |
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if ($t[0] != '<') |
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{ // Token is not a tag |
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if ($w >= $length && $finish_sentence && preg_match('/[\?\.\!]\s*$/uS', $t) == 1) |
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{ // Limit reached, continue until ? . or ! occur at the end |
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$out .= trim($t); |
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break; |
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} |
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if (1 == $use_words) |
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{ // Count words |
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$w++; |
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} else |
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{ // Count/trim characters |
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$chars = trim($t); // Remove surrounding space |
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$c = strlen($chars); |
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if ($c + $w > $length && !$finish_sentence) |
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{ // Token is too long |
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$c = ($finish_word) ? $c : $length - $w; // Keep token to finish word |
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$t = substr($t, 0, $c); |
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} |
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$w += $c; |
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} |
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} |
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// Append what's left of the token |
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$out .= $t; |
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} |
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|
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return trim(force_balance_tags($out)); |
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} |
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|
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public function text_add_more($text, $ellipsis, $read_more) |
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{ |
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// New filter in WP2.9, seems unnecessary for now |
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//$ellipsis = apply_filters('excerpt_more', $ellipsis); |
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|
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if ($read_more) |
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$ellipsis .= sprintf(' <a href="%s" class="read_more">%s</a>', get_permalink(), $read_more); |
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|
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$pos = strrpos($text, '</'); |
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if ($pos !== false) |
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// Inside last HTML tag |
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$text = substr_replace($text, $ellipsis, $pos, 0); |
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else |
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// After the content |
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$text .= $ellipsis; |
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|
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return $text; |
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} |
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|
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public function install() |
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{ |
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foreach($this->default_options as $k => $v) |
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{ |
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add_option($this->name . '_' . $k, $v); |
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} |
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} |
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|
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public function uninstall() |
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{ |
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// Nothing to do (note: deactivation hook is also disabled) |
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} |
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|
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private function load_options() |
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{ |
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foreach($this->default_options as $k => $v) |
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{ |
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$this->default_options[$k] = get_option($this->name . '_' . $k, $v); |
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} |
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} |
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|
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private function update_options() |
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{ |
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$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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$finish_word = ('on' == $_POST[$this->name . '_finish_word']) ? 1 : 0; |
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$finish_sentence = ('on' == $_POST[$this->name . '_finish_sentence']) ? 1 : 0; |
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$add_link = ('on' == $_POST[$this->name . '_add_link']) ? 1 : 0; |
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|
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// TODO: Drop magic quotes (deprecated in php 5.3) |
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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 . '_finish_word', $finish_word); |
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update_option($this->name . '_finish_sentence', $finish_sentence); |
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update_option($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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public 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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$ellipsis = htmlentities($ellipsis); |
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$read_more = htmlentities($read_more); |
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|
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$tag_list = array_unique(self::$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 |
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_e("Advanced Excerpt Options", $this->text_domain); |
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?></h2> |
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<form method="post" action=""> |
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<?php |
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if (function_exists('wp_nonce_field')) |
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wp_nonce_field($this->name . '_update_options'); |
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?> |
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|
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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"> |
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<?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" |
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id="<?php echo $this->name; ?>_length" |
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value="<?php echo $length; ?>" size="2"/> |
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<input name="<?php echo $this->name; ?>_use_words" type="checkbox" |
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id="<?php echo $this->name; ?>_use_words" value="on"<?php |
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echo (1 == $use_words) ? ' checked="checked"' : ''; ?>/> |
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<?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"> |
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<?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" |
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id="<?php echo $this->name; ?>_ellipsis" |
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value="<?php echo $ellipsis; ?>" size="5"/> |
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<?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; ?>_length"> |
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<?php _e("Finish:", $this->text_domain); ?></label></th> |
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<td> |
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<input name="<?php echo $this->name; ?>_finish_word" type="checkbox" |
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id="<?php echo $this->name; ?>_finish_word" value="on"<?php |
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echo (1 == $finish_word) ? ' checked="checked"' : ''; ?>/> |
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<?php _e("Word", $this->text_domain); ?><br/> |
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<input name="<?php echo $this->name; ?>_finish_sentence" type="checkbox" |
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id="<?php echo $this->name; ?>_finish_sentence" value="on"<?php |
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echo (1 == $finish_sentence) ? ' checked="checked"' : ''; ?>/> |
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<?php _e("Sentence", $this->text_domain); ?> |
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<br /> |
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<?php _e("Prevents cutting a word or sentence at the end of an excerpt. This option can result in (slightly) longer excerpts.", $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"> |
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<?php _e("‘Read-more’ Text:", $this->text_domain); ?></label></th> |
| 349 |
<td> |
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<input name="<?php echo $this->name; ?>_read_more" type="text" |
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id="<?php echo $this->name; ?>_read_more" value="<?php echo $read_more; ?>" /> |
| 352 |
<input name="<?php echo $this->name; ?>_add_link" type="checkbox" |
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id="<?php echo $this->name; ?>_add_link" value="on" <?php |
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echo (1 == $add_link) ? 'checked="checked" ' : ''; ?>/> |
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<?php _e("Add link to excerpt", $this->text_domain); ?> |
| 356 |
</td> |
| 357 |
</tr> |
| 358 |
<tr valign="top"> |
| 359 |
<th scope="row"><label for="<?php echo $this->name; ?>_no_custom"> |
| 360 |
<?php _e("No Custom Excerpts:", $this->text_domain); ?></label></th> |
| 361 |
<td> |
| 362 |
<input name="<?php echo $this->name; ?>_no_custom" type="checkbox" |
| 363 |
id="<?php echo $this->name; ?>_no_custom" value="on" <?php |
| 364 |
echo (1 == $no_custom) ? 'checked="checked" ' : ''; ?>/> |
| 365 |
<?php _e("Generate excerpts even if a post has a custom excerpt attached.", $this->text_domain); ?> |
| 366 |
</td> |
| 367 |
</tr> |
| 368 |
<tr valign="top"> |
| 369 |
<th scope="row"><label for="<?php echo $this->name; ?>_no_shortcode"> |
| 370 |
<?php _e("Strip Shortcodes:", $this->text_domain); ?></label></th> |
| 371 |
<td> |
| 372 |
<input name="<?php echo $this->name; ?>_no_shortcode" type="checkbox" |
| 373 |
id="<?php echo $this->name; ?>_no_shortcode" value="on" <?php |
| 374 |
echo (1 == $no_shortcode) ? 'checked="checked" ' : ''; ?>/> |
| 375 |
<?php _e("Remove shortcodes from the excerpt. <em>(recommended)</em>", $this->text_domain); ?> |
| 376 |
</td> |
| 377 |
</tr> |
| 378 |
<tr valign="top"> |
| 379 |
<th scope="row"><?php _e("Keep Markup:", $this->text_domain); ?></th> |
| 380 |
<td> |
| 381 |
<table id="<?php echo $this->name; ?>_tags_table"> |
| 382 |
<tr> |
| 383 |
<td colspan="<?php echo $tag_cols; ?>"> |
| 384 |
<input name="<?php echo $this->name; ?>_allowed_tags[]" type="checkbox" |
| 385 |
value="_all" <?php echo (in_array('_all', $allowed_tags)) ? 'checked="checked" ' : ''; ?>/> |
| 386 |
<?php _e("Don't remove any markup", $this->text_domain); ?> |
| 387 |
</td> |
| 388 |
</tr> |
| 389 |
<?php |
| 390 |
$i = 0; |
| 391 |
foreach ($tag_list as $tag): |
| 392 |
if ($tag == '_all') |
| 393 |
continue; |
| 394 |
if (0 == $i % $tag_cols): |
| 395 |
?> |
| 396 |
<tr> |
| 397 |
<?php |
| 398 |
endif; |
| 399 |
$i++; |
| 400 |
?> |
| 401 |
<td> |
| 402 |
<input name="<?php echo $this->name; ?>_allowed_tags[]" type="checkbox" |
| 403 |
value="<?php echo $tag; ?>" <?php |
| 404 |
echo (in_array($tag, $allowed_tags)) ? 'checked="checked" ' : ''; ?>/> |
| 405 |
<code><?php echo $tag; ?></code> |
| 406 |
</td> |
| 407 |
<?php |
| 408 |
if (0 == $i % $tag_cols): |
| 409 |
$i = 0; |
| 410 |
echo '</tr>'; |
| 411 |
endif; |
| 412 |
endforeach; |
| 413 |
if (0 != $i % $tag_cols): |
| 414 |
?> |
| 415 |
<td colspan="<?php echo ($tag_cols - $i); ?>"> </td> |
| 416 |
</tr> |
| 417 |
<?php |
| 418 |
endif; |
| 419 |
?> |
| 420 |
</table> |
| 421 |
<a href="" id="<?php echo $this->name; ?>_select_all">Select all</a> |
| 422 |
/ <a href="" id="<?php echo $this->name; ?>_select_none">Select none</a><br /> |
| 423 |
More tags: |
| 424 |
<select name="<?php echo $this->name; ?>_more_tags" id="<?php echo $this->name; ?>_more_tags"> |
| 425 |
<?php |
| 426 |
foreach (self::$options_all_tags as $tag): |
| 427 |
?> |
| 428 |
<option value="<?php echo $tag; ?>"><?php echo $tag; ?></option> |
| 429 |
<?php |
| 430 |
endforeach; |
| 431 |
?> |
| 432 |
</select> |
| 433 |
<input type="button" name="<?php echo $this->name; ?>_add_tag" id="<?php echo $this->name; ?>_add_tag" class="button" value="Add tag" /> |
| 434 |
</td> |
| 435 |
</tr> |
| 436 |
</table> |
| 437 |
<p class="submit"><input type="submit" name="Submit" class="button-primary" |
| 438 |
value="<?php _e("Save Changes", $this->text_domain); ?>" /></p> |
| 439 |
</form> |
| 440 |
</div> |
| 441 |
<?php |
| 442 |
} |
| 443 |
|
| 444 |
public function page_script() |
| 445 |
{ |
| 446 |
wp_enqueue_script($this->name . '_script', WP_PLUGIN_URL . '/advanced-excerpt/advanced-excerpt.js', array( |
| 447 |
'jquery' |
| 448 |
)); |
| 449 |
} |
| 450 |
|
| 451 |
public function add_pages() |
| 452 |
{ |
| 453 |
$options_page = add_options_page(__("Advanced Excerpt Options", $this->text_domain), __("Excerpt", $this->text_domain), 'manage_options', 'options-' . $this->name, array( |
| 454 |
&$this, |
| 455 |
'page_options' |
| 456 |
)); |
| 457 |
|
| 458 |
// Scripts |
| 459 |
add_action('admin_print_scripts-' . $options_page, array( |
| 460 |
&$this, |
| 461 |
'page_script' |
| 462 |
)); |
| 463 |
} |
| 464 |
} |
| 465 |
|
| 466 |
AdvancedExcerpt::Instance(); |
| 467 |
|
| 468 |
// Do not use outside the Loop! |
| 469 |
function the_advanced_excerpt($args = '', $get = true) |
| 470 |
{ |
| 471 |
if (!empty($args) && !is_array($args)) |
| 472 |
{ |
| 473 |
$args = wp_parse_args($args); |
| 474 |
|
| 475 |
// Parse query style parameters |
| 476 |
if (isset($args['ellipsis'])) |
| 477 |
$args['ellipsis'] = urldecode($args['ellipsis']); |
| 478 |
|
| 479 |
if (isset($args['allowed_tags'])) |
| 480 |
$args['allowed_tags'] = preg_split('/[\s,]+/', $args['allowed_tags']); |
| 481 |
|
| 482 |
if (isset($args['exclude_tags'])) |
| 483 |
{ |
| 484 |
$args['exclude_tags'] = preg_split('/[\s,]+/', $args['exclude_tags']); |
| 485 |
} |
| 486 |
} |
| 487 |
// Set temporary options |
| 488 |
AdvancedExcerpt::Instance()->options = $args; |
| 489 |
|
| 490 |
if ($get) |
| 491 |
return get_the_excerpt(); |
| 492 |
else |
| 493 |
the_excerpt(); |
| 494 |
} |
| 495 |
endif; |
| 496 |
|
