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<?php
/**
* @package Warp Theme Framework
* @author YOOtheme http://www.yootheme.com
* @copyright Copyright (C) YOOtheme GmbH
* @license http://www.gnu.org/licenses/gpl.html GNU/GPL
*/
namespace Warp\Dom;
/**
* Converts CSS Selectors to XPath Query.
*/
class CssSelector
{
protected static $regex = array(
'element' => '/^\s*(\*|[\w\-]+)(?:\b|$)?/i',
'id' => '/^#([\w\-\*]+)(?:\b|$)/i',
'class' => '/^\.([\w\-\*]+)(?:\b|$)/i',
'attr1' => '/^\[((?:[\w-]+:)?[\w-]+)\]/i',
'attr2' => '/^\[\s*([^~\*\!\^\$\|=\s]+)\s*([~\*\^\!\$\|]?=)\s*["\']?([^"\'\]]*)["\']?\s*\]/i',
'pseudo' => '/^:((?:first|last|only)-child|(?:en|dis)abled|first|last|empty|checked|not|contains)(?:\((.*?)\))?(?:\b|$|(?=\s|[:+~>]))/i',
'combinator' => '/^(?:\s*[>+~\s])?/i'
);
protected static $xpath = array(
'id' => "@id = '%s'",
'class' => "contains(concat(' ', normalize-space(@class), ' '), ' %s ')",
'attr' => "@%s",
'contains' => "contains(string(.), '%s')",
'not' => 'not(%s)',
'operators' => array("=" => "@%1 = '%3'", "!=" => "not(@%1) or @%1 != '%3'", "^=" => "starts-with(@%1, '%3')", "$=" => "substring(@%1, (string-length(@%1) - string-length('%3') + 1)) = '%3'", "*=" => "contains(@%1, '%3')", "~=" => "contains(concat(' ', normalize-space(@%1), ' '), ' %3 ')", "|=" => "@%1 = '%3' or starts-with(@%1, '%3-')"),
'pseudos' => array('first-child' => 'not(preceding-sibling::*)', 'last-child' => 'not(following-sibling::*)', 'only-child' => 'not(preceding-sibling::* or following-sibling::*)', 'enabled' => "not(@disabled) and (@type!='hidden')", 'disabled' => "(@disabled) and (@type!='hidden')", 'first' => 'position() = 1', 'last' => 'last()', 'empty' => 'count(*) = 0 and (count(text()) = 0)', 'checked' => '@checked'),
'combinators' => array('>' => 'child', '~' => 'general-sibling', '+' => 'adjacent-sibling')
);
protected static $cache = array();
public static function toXPath($selector, $prefix = 'descendant-or-self::')
{
if (!isset(self::$cache[$prefix][$selector])) {
$xpath = array();
foreach (explode(',', $selector) as $sel) {
if ($sel = trim($sel)) {
$xpath[] = self::convertSelector($sel, $prefix);
}
}
if ($xpath = implode(' | ', $xpath)) {
self::$cache[$prefix][$selector] = $xpath;
} else {
return null;
}
}
return self::$cache[$prefix][$selector];
}
protected static function convertSelector($selector, $prefix)
{
$element = array('element' => '*', 'combinator' => null, 'conditions' => array());
$elements = array();
$selector = trim($selector);
$index = 0;
$last = null;
$xpath = null;
while (strlen($selector) > 0 && $selector != $last) {
$last = $selector;
// create element
if (!isset($elements[$index])) {
$elements[$index] = array_merge($element);
}
// match element name
if (preg_match(self::$regex['element'], $selector, $matches)) {
$elements[$index]['element'] = $matches[1];
$selector = substr($selector, strlen($matches[0]));
}
// match id
if (preg_match(self::$regex['id'], $selector, $matches)) {
$elements[$index]['conditions'][] = sprintf(self::$xpath['id'], $matches[1]);
$selector = substr($selector, strlen($matches[0]));
}
// match class name
if (preg_match(self::$regex['class'], $selector, $matches)) {
$elements[$index]['conditions'][] = sprintf(self::$xpath['class'], $matches[1]);
$selector = substr($selector, strlen($matches[0]));
}
// match attribute presence
if ($attr1 = preg_match(self::$regex['attr1'], $selector, $matches)) {
$elements[$index]['conditions'][] = sprintf(self::$xpath['attr'], $matches[1]);
$selector = substr($selector, strlen($matches[0]));
}
// match attribute and value
if (!$attr1 && preg_match(self::$regex['attr2'], $selector, $matches)) {
$elements[$index]['conditions'][] = str_replace(array('%1', '%3'), array($matches[1], $matches[3]), self::$xpath['operators'][$matches[2]]);
$selector = substr($selector, strlen($matches[0]));
}
// match pseudo
if (preg_match(self::$regex['pseudo'], $selector, $matches)) {
if (isset(self::$xpath['pseudos'][$matches[1]])) {
$elements[$index]['conditions'][] = self::$xpath['pseudos'][$matches[1]];
} elseif ($matches[1] == 'not') {
$elements[$index]['conditions'][] = sprintf(self::$xpath['not'], self::toXPath($matches[2]));
} elseif ($matches[1] == 'contains') {
$elements[$index]['conditions'][] = sprintf(self::$xpath['contains'], $matches[2]);
}
$selector = substr($selector, strlen($matches[0]));
}
// match combinators
if (preg_match(self::$regex['combinator'], $selector, $matches) && strlen($matches[0])) {
$combinator = 'descendant';
if (($comb = trim($matches[0])) && isset(self::$xpath['combinators'][$comb])) {
$combinator = self::$xpath['combinators'][$comb];
}
$elements[++$index] = array_merge($element, compact('combinator'));
$selector = substr($selector, strlen($matches[0]));
}
$selector = trim($selector);
}
// create xpath expression
foreach ($elements as $element) {
switch ($element['combinator']) {
case 'descendant':
$xpath .= '/descendant::';
break;
case 'child':
$xpath .= '/child::';
break;
case 'general-sibling':
$xpath .= '/following-sibling::';
break;
case 'adjacent-sibling':
$xpath .= '/following-sibling::';
array_unshift($element['conditions'], 'position() = 1');
if ($element['element'] != '*') {
array_unshift($element['conditions'], sprintf("name() = '%s'", $element['element']));
$element['element'] = '*';
}
break;
default:
$xpath .= $prefix;
}
$xpath .= $element['element'];
if (count($element['conditions'])) {
$xpath .= '[';
foreach ($element['conditions'] as $i => $condition) {
$xpath .= $i == 0 ? $condition : sprintf(' and (%s)', $condition);
}
$xpath .= ']';
}
}
return $xpath;
}
}