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