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<?php | |
/** | |
* Shows how to highlight several words in the body of a html document. It adds spans with specified | |
* classes around the found words/word parts. | |
* | |
* @version $Id: highlightWords.php 444 2010-05-10 09:29:49Z subjective $ | |
* @license http://www.opensource.org/licenses/mit-license.php The MIT License | |
* @copyright Copyright (c) 2009 Bastian Feder, Thomas Weinert | |
*/ | |
$html = <<<HTML | |
<head> | |
<!-- | |
The quick brown fox jumps over the lazy dog | |
--> | |
<body> | |
The quick brown <span class="animal">fox</span> jumps over the lazy dog | |
</body> | |
</head> | |
HTML; | |
$highlighter = new FluentDOMHighlighter( | |
array( | |
'jump' => 'highlightOne', | |
'The' => 'highlightTwo', | |
'jumps' => 'highlightThree' | |
) | |
); | |
require('../../FluentDOM.php'); | |
echo $highlighter->highlight( | |
FluentDOM($html, 'html')->find('//body') | |
); | |
/** | |
* Highlights strings in textnodes, by wrapping them into a span with the given class | |
*/ | |
class FluentDOMHighlighter { | |
/** | |
* Internal variable for the string => class name mapping | |
* @var array | |
*/ | |
protected $_highlights = array(); | |
/** | |
* Created pattern to match and split the content of the text nodes | |
* @var unknown_type | |
*/ | |
protected $_pattern = ''; | |
/** | |
* Create highlighter and set string => class name mapping | |
* | |
* @param array $highlights | |
* @return FluentDOMHighlighter | |
*/ | |
public function __construct(array $highlights) { | |
$this->setHighlights($highlights); | |
} | |
/** | |
* Apply Highlight to FluentDOM selection | |
* | |
* @return FluentDOM | |
*/ | |
public function highlight(FluentDOM $fd) { | |
$fd | |
->find('descendant-or-self::text()') | |
->each(array($this, 'replace')); | |
return $fd->spawn(); | |
} | |
/** | |
* Set string => class name mapping | |
* | |
* @param array $highlights | |
*/ | |
public function setHighlights(array $highlights) { | |
uksort($highlights, array($this, 'compareLength')); | |
$this->_highlights = array(); | |
$pattern = ''; | |
foreach ($highlights as $string => $className) { | |
$key = strtolower($string); | |
$this->_highlights[$key] = $className; | |
$pattern .= '|'.preg_quote($key); | |
} | |
$this->_pattern = '(('.substr($pattern, 1).'))ui'; | |
} | |
/** | |
* Compare string by length, longer strings first | |
* | |
* @param string $stringOne | |
* @param string $stringTwo | |
* @return integer | |
*/ | |
public function compareLength($stringOne, $stringTwo) { | |
$lengthOne = strlen($stringOne); | |
$lengthTwo = strlen($stringTwo); | |
if ($lengthOne > $lengthTwo) { | |
return -1; | |
} elseif ($lengthOne < $lengthTwo) { | |
return 1; | |
} else { | |
return strcmp($stringOne, $stringTwo); | |
} | |
} | |
/** | |
* Check text node content for strings, split them by the strings, and replace strings with | |
* a node structure. By using the DOM functions and not a somple replace, we can avoid | |
* any problems with encodings. | |
* | |
* @param DOMText $node | |
*/ | |
public function replace(DOMText $node) { | |
if (preg_match($this->_pattern, $node->nodeValue)) { | |
// split using the pattern, but capture the delimiter strings | |
$parts = preg_split( | |
$this->_pattern, $node->nodeValue, -1, PREG_SPLIT_DELIM_CAPTURE | |
); | |
$items = array(); | |
foreach ($parts as $part) { | |
$string = strtolower($part); | |
if (isset($this->_highlights[$string])) { | |
$span = $node->ownerDocument->createElement('span'); | |
$items[] = FluentDOM($span) | |
->addClass($this->_highlights[$string]) | |
->text($part) | |
->item(0); | |
} else { | |
$items[] = $node->ownerDocument->createTextNode($part); | |
} | |
} | |
// replace the text node | |
FluentDOM($node)->replaceWith($items); | |
} | |
} | |
} |
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