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<?php
/**
* Zend Framework
*
* LICENSE
*
* This source file is subject to the new BSD license that is bundled
* with this package in the file LICENSE.txt.
* It is also available through the world-wide-web at this URL:
* http://framework.zend.com/license/new-bsd
* If you did not receive a copy of the license and are unable to
* obtain it through the world-wide-web, please send an email
* to license@zend.com so we can send you a copy immediately.
*
* @category Zend
* @package Zend_Dom
* @copyright Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
*/
/**
* Transform CSS selectors to XPath
*
* @package Zend_Dom
* @subpackage Query
* @copyright Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
* @version $Id: Css2Xpath.php 22045 2010-04-28 19:59:49Z matthew $
*/
class Zend_Dom_Query_Css2Xpath
{
/**
* Transform CSS expression to XPath
*
* @param string $path
* @return string
*/
public static function transform($path)
{
$path = (string) $path;
if (strstr($path, ',')) {
$paths = explode(',', $path);
$expressions = array();
foreach ($paths as $path) {
$xpath = self::transform(trim($path));
if (is_string($xpath)) {
$expressions[] = $xpath;
} elseif (is_array($xpath)) {
$expressions = array_merge($expressions, $xpath);
}
}
return implode('|', $expressions);
}
$paths = array('//');
$path = preg_replace('|\s+>\s+|', '>', $path);
$segments = preg_split('/\s+/', $path);
foreach ($segments as $key => $segment) {
$pathSegment = self::_tokenize($segment);
if (0 == $key) {
if (0 === strpos($pathSegment, '[contains(')) {
$paths[0] .= '*' . ltrim($pathSegment, '*');
} else {
$paths[0] .= $pathSegment;
}
continue;
}
if (0 === strpos($pathSegment, '[contains(')) {
foreach ($paths as $key => $xpath) {
$paths[$key] .= '//*' . ltrim($pathSegment, '*');
$paths[] = $xpath . $pathSegment;
}
} else {
foreach ($paths as $key => $xpath) {
$paths[$key] .= '//' . $pathSegment;
}
}
}
if (1 == count($paths)) {
return $paths[0];
}
return implode('|', $paths);
}
/**
* Tokenize CSS expressions to XPath
*
* @param string $expression
* @return string
*/
protected static function _tokenize($expression)
{
// Child selectors
$expression = str_replace('>', '/', $expression);
// IDs
$expression = preg_replace('|#([a-z][a-z0-9_-]*)|i', '[@id=\'$1\']', $expression);
$expression = preg_replace('|(?<![a-z0-9_-])(\[@id=)|i', '*$1', $expression);
// arbitrary attribute strict equality
$expression = preg_replace_callback(
'|\[([a-z0-9_-]+)=[\'"]([^\'"]+)[\'"]\]|i',
array(__CLASS__, '_createEqualityExpression'),
$expression
);
// arbitrary attribute contains full word
$expression = preg_replace_callback(
'|\[([a-z0-9_-]+)~=[\'"]([^\'"]+)[\'"]\]|i',
array(__CLASS__, '_normalizeSpaceAttribute'),
$expression
);
// arbitrary attribute contains specified content
$expression = preg_replace_callback(
'|\[([a-z0-9_-]+)\*=[\'"]([^\'"]+)[\'"]\]|i',
array(__CLASS__, '_createContainsExpression'),
$expression
);
// Classes
$expression = preg_replace(
'|\.([a-z][a-z0-9_-]*)|i',
"[contains(concat(' ', normalize-space(@class), ' '), ' \$1 ')]",
$expression
);
/** ZF-9764 -- remove double asterix */
$expression = str_replace('**', '*', $expression);
return $expression;
}
/**
* Callback for creating equality expressions
*
* @param array $matches
* @return string
*/
protected static function _createEqualityExpression($matches)
{
return '[@' . strtolower($matches[1]) . "='" . $matches[2] . "']";
}
/**
* Callback for creating expressions to match one or more attribute values
*
* @param array $matches
* @return string
*/
protected static function _normalizeSpaceAttribute($matches)
{
return "[contains(concat(' ', normalize-space(@" . strtolower($matches[1]) . "), ' '), ' "
. $matches[2] . " ')]";
}
/**
* Callback for creating a strict "contains" expression
*
* @param array $matches
* @return string
*/
protected static function _createContainsExpression($matches)
{
return "[contains(@" . strtolower($matches[1]) . ", '"
. $matches[2] . "')]";
}
}
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