1 <?php

     2 /**

     3  * Zend Framework

     4  *

     5  * LICENSE

     6  *

     7  * This source file is subject to the new BSD license that is bundled

     8  * with this package in the file LICENSE.txt.

     9  * It is also available through the world-wide-web at this URL:

    10  * http://framework.zend.com/license/new-bsd

    11  * If you did not receive a copy of the license and are unable to

    12  * obtain it through the world-wide-web, please send an email

    13  * to license@zend.com so we can send you a copy immediately.

    14  *

    15  * @category   Zend

    16  * @package    Zend_Dom

    17  * @copyright  Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)

    18  * @license    http://framework.zend.com/license/new-bsd     New BSD License

    19  */

    20 

    21 /**

    22  * Transform CSS selectors to XPath

    23  *

    24  * @package    Zend_Dom

    25  * @subpackage Query

    26  * @copyright  Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)

    27  * @license    http://framework.zend.com/license/new-bsd     New BSD License

    28  * @version    $Id: Css2Xpath.php 22044 2010-04-28 19:58:29Z matthew $

    29  */

    30 class Zend_Dom_Query_Css2Xpath

    31 {

    32     /**

    33      * Transform CSS expression to XPath

    34      *

    35      * @param  string $path

    36      * @return string

    37      */

    38     public static function transform($path)

    39     {

    40         $path = (string) $path;

    41         if (strstr($path, ',')) {

    42             $paths       = explode(',', $path);

    43             $expressions = array();

    44             foreach ($paths as $path) {

    45                 $xpath = self::transform(trim($path));

    46                 if (is_string($xpath)) {

    47                     $expressions[] = $xpath;

    48                 } elseif (is_array($xpath)) {

    49                     $expressions = array_merge($expressions, $xpath);

    50                 }

    51             }

    52             return implode('|', $expressions);

    53         }

    54 

    55         $paths    = array('//');

    56         $path     = preg_replace('|\s+>\s+|', '>', $path);

    57         $segments = preg_split('/\s+/', $path);

    58         foreach ($segments as $key => $segment) {

    59             $pathSegment = self::_tokenize($segment);

    60             if (0 == $key) {

    61                 if (0 === strpos($pathSegment, '[contains(')) {

    62                     $paths[0] .= '*' . ltrim($pathSegment, '*');

    63                 } else {

    64                     $paths[0] .= $pathSegment;

    65                 }

    66                 continue;

    67             }

    68             if (0 === strpos($pathSegment, '[contains(')) {

    69                 foreach ($paths as $key => $xpath) {

    70                     $paths[$key] .= '//*' . ltrim($pathSegment, '*');

    71                     $paths[]      = $xpath . $pathSegment;

    72                 }

    73             } else {

    74                 foreach ($paths as $key => $xpath) {

    75                     $paths[$key] .= '//' . $pathSegment;

    76                 }

    77             }

    78         }

    79 

    80         if (1 == count($paths)) {

    81             return $paths[0];

    82         }

    83         return implode('|', $paths);

    84     }

    85 

    86     /**

    87      * Tokenize CSS expressions to XPath

    88      *

    89      * @param  string $expression

    90      * @return string

    91      */

    92     protected static function _tokenize($expression)

    93     {

    94         // Child selectors

    95         $expression = str_replace('>', '/', $expression);

    96 

    97         // IDs

    98         $expression = preg_replace('|#([a-z][a-z0-9_-]*)|i', '[@id=\'$1\']', $expression);

    99         $expression = preg_replace('|(?<![a-z0-9_-])(\[@id=)|i', '*$1', $expression);

   100 

   101         // arbitrary attribute strict equality

   102         $expression = preg_replace_callback(

   103             '|\[([a-z0-9_-]+)=[\'"]([^\'"]+)[\'"]\]|i',

   104             array(__CLASS__, '_createEqualityExpression'),

   105             $expression

   106         );

   107 

   108         // arbitrary attribute contains full word

   109         $expression = preg_replace_callback(

   110             '|\[([a-z0-9_-]+)~=[\'"]([^\'"]+)[\'"]\]|i',

   111             array(__CLASS__, '_normalizeSpaceAttribute'),

   112             $expression

   113         );

   114 

   115         // arbitrary attribute contains specified content

   116         $expression = preg_replace_callback(

   117             '|\[([a-z0-9_-]+)\*=[\'"]([^\'"]+)[\'"]\]|i',

   118             array(__CLASS__, '_createContainsExpression'),

   119             $expression

   120         );

   121 

   122         // Classes

   123         $expression = preg_replace(

   124             '|\.([a-z][a-z0-9_-]*)|i', 

   125             "[contains(concat(' ', normalize-space(@class), ' '), ' \$1 ')]", 

   126             $expression

   127         );

   128 

   129         /** ZF-9764 -- remove double asterix */

   130         $expression = str_replace('**', '*', $expression);

   131 

   132         return $expression;

   133     }

   134 

   135     /**

   136      * Callback for creating equality expressions

   137      * 

   138      * @param  array $matches 

   139      * @return string

   140      */

   141     protected static function _createEqualityExpression($matches)

   142     {

   143         return '[@' . strtolower($matches[1]) . "='" . $matches[2] . "']";

   144     }

   145 

   146     /**

   147      * Callback for creating expressions to match one or more attribute values

   148      * 

   149      * @param  array $matches 

   150      * @return string

   151      */

   152     protected static function _normalizeSpaceAttribute($matches)

   153     {

   154         return "[contains(concat(' ', normalize-space(@" . strtolower($matches[1]) . "), ' '), ' " 

   155              . $matches[2] . " ')]";

   156     }

   157 

   158     /**

   159      * Callback for creating a strict "contains" expression

   160      * 

   161      * @param  array $matches 

   162      * @return string

   163      */

   164     protected static function _createContainsExpression($matches)

   165     {

   166         return "[contains(@" . strtolower($matches[1]) . ", '" 

   167              . $matches[2] . "')]";

   168     }

   169 }