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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) 2005-2015 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) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
  * @license    http://framework.zend.com/license/new-bsd     New BSD License
  * @version    $Id$
  */
 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] . "')]";
     }
 }