<?php
/**
* Copyright (c) 2010-2017 Arne Blankerts <arne@blankerts.de>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* * Neither the name of Arne Blankerts nor the names of contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT * NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER ORCONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
* OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
*
* @category PHP
* @package TheSeer\fDOM
* @author Arne Blankerts <arne@blankerts.de>
* @copyright Arne Blankerts <arne@blankerts.de>, All rights reserved.
* @license http://www.opensource.org/licenses/bsd-license.php BSD License
* @link http://github.com/theseer/fdomdocument
*
*/

namespace TheSeer\fDOM\CSS {

/**
* Class Translator
*
* The regular expressions used in this class are heavily inspired by and mostly adopted from
* the css2xpath.js code by Andrea Giammarchi (http://code.google.com/p/css2xpath/).
* The JavaScript version (css2xpath.js) is licensed under the MIT License
*
*/
class Translator {

/**
* @var array
*/
private $rules;

/**
* @param string $selector A CSS Selector string
*
* @return string
*/
public function translate($selector) {
foreach($this->getRules() as $rule) {
/** @var RuleInterface $rule */
$selector = $rule->apply($selector);
}
return '//' . $selector;
}

/**
* @return array
*/
private function getRules() {
if ($this->rules != NULL) {
return $this->rules;
}

$this->rules = array(

// prefix|name
new RegexRule('/([a-zA-Z0-9\_\-\*]+)\|([a-zA-Z0-9\_\-\*]+)/', '$1:$2'),

// add @ for attribs
new RegexRule("/\[([^\]~\$\*\^\|\!]+)(=[^\]]+)?\]/", '[@$1$2]'),

// multiple queries
new RegexRule("/\s*,\s*/", '|'),

// , + ~ >
new RegexRule("/\s*(\+|~|>)\s*/", '$1'),

//* ~ + >
new RegexRule("/([a-zA-Z0-9\_\-\*])~([a-zA-Z0-9\_\-\*])/", '$1/following-sibling::$2'),
new RegexRule("/([a-zA-Z0-9\_\-\*])\+([a-zA-Z0-9\_\-\*])/", '$1/following-sibling::*[1]/self::$2'),
new RegexRule("/([a-zA-Z0-9\_\-\*])>([a-zA-Z0-9\_\-\*])/", '$1/$2'),

// all unescaped stuff escaped
new RegexRule("/\[([^=]+)=([^'|'][^\]]*)\]/", '[$1="$2"]'),

// all descendant or self to //
new RegexRule("/(^|[^a-zA-Z0-9\_\-\*])(#|\.)([a-zA-Z0-9\_\-]+)/", '$1*$2$3'),
new RegexRule("/([\>\+\|\~\,\s])([a-zA-Z\*]+)/", '$1//$2'),
new RegexRule("/\s+\/\//", '//'),

// :first-child
new RegexRule("/([a-zA-Z0-9\_\-\*]+):first-child/", '*[1]/self::$1'),

// :last-child
new RegexRule("/([a-zA-Z0-9\_\-\*]+):last-child/", '$1[not(following-sibling::*)]'),

// :only-child
new RegexRule("/([a-zA-Z0-9\_\-\*]+):only-child/", '*[last()=1]/self::$1'),

// :empty
new RegexRule("/([a-zA-Z0-9\_\-\*]+):empty/", '$1[not(*) and not(normalize-space())]'),

// :not
new NotRule($this),

// :nth-child
new NthChildRule(),

// :contains(selectors)
new RegexRule('/:contains\(([^\)]*)\)/', '[contains(string(.),"$1")]'),

// |= attrib
new RegexRule("/\[([a-zA-Z0-9\_\-]+)\|=([^\]]+)\]/", '[@$1=$2 or starts-with(@$1,concat($2,"-"))]'),

// *= attrib
new RegexRule("/\[([a-zA-Z0-9\_\-]+)\*=([^\]]+)\]/", '[contains(@$1,$2)]'),

// ~= attrib
new RegexRule("/\[([a-zA-Z0-9\_\-]+)~=([^\]]+)\]/", '[contains(concat(" ",normalize-space(@$1)," "),concat(" ",$2," "))]'),

// ^= attrib
new RegexRule("/\[([a-zA-Z0-9\_\-]+)\^=([^\]]+)\]/", '[starts-with(@$1,$2)]'),

// $= attrib
new DollarEqualRule(),

// != attrib
new RegexRule("/\[([a-zA-Z0-9\_\-]+)\!=([^\]]+)\]/", '[not(@$1) or @$1!=$2]'),

// ids and classes
new RegexRule("/#([a-zA-Z0-9\_\-]+)/", '[@id="$1"]'),
new RegexRule("/\.([a-zA-Z0-9\_\-]+)/", '[contains(concat(" ",normalize-space(@class)," ")," $1 ")]'),

// normalize multiple filters
new RegexRule("/\]\[([^\]]+)/", ' and ($1)')

);
return $this->rules;
}
}

}