338 lines
10 KiB
PHP
338 lines
10 KiB
PHP
<?php
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/**
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* Text Helper
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*
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* Text manipulations: Highlight, excerpt, truncate, strip of links, convert email addresses to mailto: links...
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*
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* PHP versions 4 and 5
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*
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* CakePHP(tm) : Rapid Development Framework (http://cakephp.org)
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* Copyright 2005-2010, Cake Software Foundation, Inc. (http://cakefoundation.org)
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*
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* Licensed under The MIT License
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* Redistributions of files must retain the above copyright notice.
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*
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* @copyright Copyright 2005-2010, Cake Software Foundation, Inc. (http://cakefoundation.org)
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* @link http://cakephp.org CakePHP(tm) Project
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* @package cake
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* @subpackage cake.cake.libs.view.helpers
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* @since CakePHP(tm) v 0.10.0.1076
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* @license MIT License (http://www.opensource.org/licenses/mit-license.php)
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*/
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/**
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* Included libraries.
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*
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*/
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if (!class_exists('HtmlHelper')) {
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App::import('Helper', 'Html');
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}
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if (!class_exists('Multibyte')) {
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App::import('Core', 'Multibyte');
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}
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/**
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* Text helper library.
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*
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* Text manipulations: Highlight, excerpt, truncate, strip of links, convert email addresses to mailto: links...
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*
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* @package cake
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* @subpackage cake.cake.libs.view.helpers
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* @link http://book.cakephp.org/view/1469/Text
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*/
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class TextHelper extends AppHelper {
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/**
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* Highlights a given phrase in a text. You can specify any expression in highlighter that
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* may include the \1 expression to include the $phrase found.
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*
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* ### Options:
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*
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* - `format` The piece of html with that the phrase will be highlighted
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* - `html` If true, will ignore any HTML tags, ensuring that only the correct text is highlighted
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*
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* @param string $text Text to search the phrase in
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* @param string $phrase The phrase that will be searched
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* @param array $options An array of html attributes and options.
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* @return string The highlighted text
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* @access public
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* @link http://book.cakephp.org/view/1469/Text#highlight-1622
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*/
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function highlight($text, $phrase, $options = array()) {
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if (empty($phrase)) {
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return $text;
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}
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$default = array(
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'format' => '<span class="highlight">\1</span>',
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'html' => false
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);
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$options = array_merge($default, $options);
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extract($options);
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if (is_array($phrase)) {
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$replace = array();
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$with = array();
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foreach ($phrase as $key => $segment) {
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$segment = "($segment)";
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if ($html) {
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$segment = "(?![^<]+>)$segment(?![^<]+>)";
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}
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$with[] = (is_array($format)) ? $format[$key] : $format;
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$replace[] = "|$segment|iu";
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}
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return preg_replace($replace, $with, $text);
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} else {
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$phrase = "($phrase)";
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if ($html) {
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$phrase = "(?![^<]+>)$phrase(?![^<]+>)";
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}
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return preg_replace("|$phrase|iu", $format, $text);
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}
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}
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/**
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* Strips given text of all links (<a href=....)
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*
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* @param string $text Text
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* @return string The text without links
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* @access public
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* @link http://book.cakephp.org/view/1469/Text#stripLinks-1623
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*/
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function stripLinks($text) {
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return preg_replace('|<a\s+[^>]+>|im', '', preg_replace('|<\/a>|im', '', $text));
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}
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/**
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* Adds links (<a href=....) to a given text, by finding text that begins with
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* strings like http:// and ftp://.
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*
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* @param string $text Text to add links to
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* @param array $options Array of HTML options.
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* @return string The text with links
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* @access public
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* @link http://book.cakephp.org/view/1469/Text#autoLinkUrls-1619
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*/
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function autoLinkUrls($text, $htmlOptions = array()) {
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$options = var_export($htmlOptions, true);
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$text = preg_replace_callback('#(?<!href="|">)((?:https?|ftp|nntp)://[^\s<>()]+)#i', create_function('$matches',
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'$Html = new HtmlHelper(); $Html->tags = $Html->loadConfig(); return $Html->link($matches[0], $matches[0],' . $options . ');'), $text);
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return preg_replace_callback('#(?<!href="|">)(?<!http://|https://|ftp://|nntp://)(www\.[^\n\%\ <]+[^<\n\%\,\.\ <])(?<!\))#i',
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create_function('$matches', '$Html = new HtmlHelper(); $Html->tags = $Html->loadConfig(); return $Html->link($matches[0], "http://" . $matches[0],' . $options . ');'), $text);
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}
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/**
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* Adds email links (<a href="mailto:....) to a given text.
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*
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* @param string $text Text
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* @param array $options Array of HTML options.
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* @return string The text with links
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* @access public
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* @link http://book.cakephp.org/view/1469/Text#autoLinkEmails-1618
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*/
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function autoLinkEmails($text, $options = array()) {
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$linkOptions = 'array(';
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foreach ($options as $option => $value) {
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$value = var_export($value, true);
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$linkOptions .= "'$option' => $value, ";
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}
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$linkOptions .= ')';
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$atom = '[a-z0-9!#$%&\'*+\/=?^_`{|}~-]';
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return preg_replace_callback(
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'/(' . $atom . '+(?:\.' . $atom . '+)*@[a-z0-9-]+(?:\.[a-z0-9-]+)+)/i',
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create_function('$matches', '$Html = new HtmlHelper(); $Html->tags = $Html->loadConfig(); return $Html->link($matches[0], "mailto:" . $matches[0],' . $linkOptions . ');'), $text);
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}
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/**
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* Convert all links and email adresses to HTML links.
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*
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* @param string $text Text
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* @param array $options Array of HTML options.
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* @return string The text with links
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* @access public
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* @link http://book.cakephp.org/view/1469/Text#autoLink-1620
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*/
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function autoLink($text, $options = array()) {
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return $this->autoLinkEmails($this->autoLinkUrls($text, $options), $options);
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}
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/**
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* Truncates text.
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*
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* Cuts a string to the length of $length and replaces the last characters
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* with the ending if the text is longer than length.
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*
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* ### Options:
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*
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* - `ending` Will be used as Ending and appended to the trimmed string
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* - `exact` If false, $text will not be cut mid-word
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* - `html` If true, HTML tags would be handled correctly
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*
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* @param string $text String to truncate.
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* @param integer $length Length of returned string, including ellipsis.
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* @param array $options An array of html attributes and options.
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* @return string Trimmed string.
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* @access public
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* @link http://book.cakephp.org/view/1469/Text#truncate-1625
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*/
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function truncate($text, $length = 100, $options = array()) {
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$default = array(
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'ending' => '...', 'exact' => true, 'html' => false
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);
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$options = array_merge($default, $options);
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extract($options);
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if ($html) {
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if (mb_strlen(preg_replace('/<.*?>/', '', $text)) <= $length) {
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return $text;
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}
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$totalLength = mb_strlen(strip_tags($ending));
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$openTags = array();
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$truncate = '';
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preg_match_all('/(<\/?([\w+]+)[^>]*>)?([^<>]*)/', $text, $tags, PREG_SET_ORDER);
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foreach ($tags as $tag) {
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if (!preg_match('/img|br|input|hr|area|base|basefont|col|frame|isindex|link|meta|param/s', $tag[2])) {
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if (preg_match('/<[\w]+[^>]*>/s', $tag[0])) {
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array_unshift($openTags, $tag[2]);
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} else if (preg_match('/<\/([\w]+)[^>]*>/s', $tag[0], $closeTag)) {
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$pos = array_search($closeTag[1], $openTags);
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if ($pos !== false) {
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array_splice($openTags, $pos, 1);
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}
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}
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}
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$truncate .= $tag[1];
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$contentLength = mb_strlen(preg_replace('/&[0-9a-z]{2,8};|&#[0-9]{1,7};|&#x[0-9a-f]{1,6};/i', ' ', $tag[3]));
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if ($contentLength + $totalLength > $length) {
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$left = $length - $totalLength;
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$entitiesLength = 0;
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if (preg_match_all('/&[0-9a-z]{2,8};|&#[0-9]{1,7};|&#x[0-9a-f]{1,6};/i', $tag[3], $entities, PREG_OFFSET_CAPTURE)) {
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foreach ($entities[0] as $entity) {
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if ($entity[1] + 1 - $entitiesLength <= $left) {
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$left--;
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$entitiesLength += mb_strlen($entity[0]);
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} else {
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break;
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}
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}
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}
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$truncate .= mb_substr($tag[3], 0 , $left + $entitiesLength);
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break;
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} else {
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$truncate .= $tag[3];
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$totalLength += $contentLength;
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}
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if ($totalLength >= $length) {
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break;
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}
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}
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} else {
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if (mb_strlen($text) <= $length) {
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return $text;
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} else {
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$truncate = mb_substr($text, 0, $length - mb_strlen($ending));
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}
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}
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if (!$exact) {
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$spacepos = mb_strrpos($truncate, ' ');
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if (isset($spacepos)) {
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if ($html) {
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$bits = mb_substr($truncate, $spacepos);
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preg_match_all('/<\/([a-z]+)>/', $bits, $droppedTags, PREG_SET_ORDER);
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if (!empty($droppedTags)) {
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foreach ($droppedTags as $closingTag) {
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if (!in_array($closingTag[1], $openTags)) {
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array_unshift($openTags, $closingTag[1]);
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}
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}
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}
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}
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$truncate = mb_substr($truncate, 0, $spacepos);
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}
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}
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$truncate .= $ending;
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if ($html) {
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foreach ($openTags as $tag) {
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$truncate .= '</'.$tag.'>';
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}
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}
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return $truncate;
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}
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/**
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* Extracts an excerpt from the text surrounding the phrase with a number of characters on each side
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* determined by radius.
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*
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* @param string $text String to search the phrase in
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* @param string $phrase Phrase that will be searched for
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* @param integer $radius The amount of characters that will be returned on each side of the founded phrase
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* @param string $ending Ending that will be appended
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* @return string Modified string
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* @access public
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* @link http://book.cakephp.org/view/1469/Text#excerpt-1621
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*/
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function excerpt($text, $phrase, $radius = 100, $ending = '...') {
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if (empty($text) or empty($phrase)) {
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return $this->truncate($text, $radius * 2, array('ending' => $ending));
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}
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$phraseLen = mb_strlen($phrase);
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if ($radius < $phraseLen) {
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$radius = $phraseLen;
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}
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$pos = mb_strpos(mb_strtolower($text), mb_strtolower($phrase));
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$startPos = 0;
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if ($pos > $radius) {
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$startPos = $pos - $radius;
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}
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$textLen = mb_strlen($text);
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$endPos = $pos + $phraseLen + $radius;
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if ($endPos >= $textLen) {
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$endPos = $textLen;
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}
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$excerpt = mb_substr($text, $startPos, $endPos - $startPos);
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if ($startPos != 0) {
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$excerpt = substr_replace($excerpt, $ending, 0, $phraseLen);
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}
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if ($endPos != $textLen) {
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$excerpt = substr_replace($excerpt, $ending, -$phraseLen);
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}
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return $excerpt;
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}
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/**
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* Creates a comma separated list where the last two items are joined with 'and', forming natural English
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*
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* @param array $list The list to be joined
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* @param string $and The word used to join the last and second last items together with. Defaults to 'and'
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* @param string $separator The separator used to join all othe other items together. Defaults to ', '
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* @return string The glued together string.
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* @access public
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* @link http://book.cakephp.org/view/1469/Text#toList-1624
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*/
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function toList($list, $and = 'and', $separator = ', ') {
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if (count($list) > 1) {
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return implode($separator, array_slice($list, null, -1)) . ' ' . $and . ' ' . array_pop($list);
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} else {
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return array_pop($list);
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}
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}
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}
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