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<?php |
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/* @description Transformation Style Sheets - Revolutionising PHP templating * |
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* @author Tom Butler [email protected] * |
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* @copyright 2017 Tom Butler <[email protected]> | https://r.je/ * |
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* @license http://www.opensource.org/licenses/bsd-license.php BSD License * |
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* @version 1.2 */ |
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namespace Transphporm\Parser; |
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class CssToXpath { |
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private $specialChars = [Tokenizer::WHITESPACE, Tokenizer::DOT, Tokenizer::GREATER_THAN, |
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'~', Tokenizer::NUM_SIGN, Tokenizer::OPEN_SQUARE_BRACKET, Tokenizer::MULTIPLY]; |
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private $translators = []; |
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private static $instances = []; |
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private $functionSet; |
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private $id; |
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public function __construct(\Transphporm\FunctionSet $functionSet, $prefix = '', $id = null) { |
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$this->id = $id; |
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self::$instances[$this->id] = $this; |
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$this->functionSet = $functionSet; |
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$this->translators = [ |
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Tokenizer::WHITESPACE => function($string) use ($prefix) { return '//' . $prefix . $string; }, |
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Tokenizer::MULTIPLY => function () { return '*'; }, |
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'' => function($string) use ($prefix) { return '/' . $prefix . $string; }, |
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Tokenizer::GREATER_THAN => function($string) use ($prefix) { return '/' . $prefix . $string; }, |
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Tokenizer::NUM_SIGN => function($string) { return '[@id=\'' . $string . '\']'; }, |
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Tokenizer::DOT => function($string) { return '[contains(concat(\' \', normalize-space(@class), \' \'), \' ' . $string . ' \')]'; }, |
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Tokenizer::OPEN_SQUARE_BRACKET => function($string) { return '[' .'php:function(\'\Transphporm\Parser\CssToXpath::processAttr\', \'' . base64_encode(serialize($string)) . '\', ., "' . $this->id . '")' . ']'; } |
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]; |
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} |
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private function createSelector() { |
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$selector = new \stdclass; |
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$selector->type = ''; |
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$selector->string = ''; |
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return $selector; |
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} |
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//XPath only allows registering of static functions... this is a hacky workaround for that |
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public static function processAttr($attr, $element, $hash) { |
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$attr = unserialize(base64_decode($attr)); |
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$functionSet = self::$instances[$hash]->functionSet; |
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$functionSet->setElement($element[0]); |
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$attributes = []; |
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foreach($element[0]->attributes as $name => $node) { |
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$attributes[$name] = $node->nodeValue; |
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} |
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$parser = new \Transphporm\Parser\Value($functionSet, true); |
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$return = $parser->parseTokens($attr, $attributes); |
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return is_array($return[0]) || $return[0] === '' ? false : $return[0]; |
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} |
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public function cleanup() { |
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unset(self::$instances[$this->id]); |
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} |
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//split the css into indivudal functions |
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private function split($css) { |
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$selectors = []; |
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$selector = $this->createSelector(); |
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$selectors[] = $selector; |
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foreach ($css as $token) { |
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if (in_array($token['type'], $this->specialChars)) { |
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$selector = $this->createSelector(); |
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$selector->type = $token['type']; |
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$selectors[] = $selector; |
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} |
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if (isset($token['value'])) $selectors[count($selectors)-1]->string = $token['value']; |
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} |
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return $selectors; |
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} |
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public function getXpath($css) { |
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$css = $this->removeSpacesFromDirectDecend($css)->splitOnToken(Tokenizer::COLON)[0]->trim(); |
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$selectors = $this->split($css); |
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$xpath = '/'; |
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foreach ($selectors as $selector) { |
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if (isset($this->translators[$selector->type])) $xpath .= $this->translators[$selector->type]($selector->string, $xpath); |
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} |
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$xpath = str_replace('/[', '/*[', $xpath); |
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return $xpath; |
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} |
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private function removeSpacesFromDirectDecend($css) { |
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$tokens = new Tokens; |
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$split = $css->splitOnToken(Tokenizer::GREATER_THAN); |
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$numSplits = count($split); |
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if ($numSplits <= 1) return $css; |
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for ($i = 0; $i < $numSplits; $i++) { |
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$tokens->add($split[$i]->trim()); |
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if (isset($split[$i+1])) $tokens->add(['type' => Tokenizer::GREATER_THAN]); |
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} |
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return $tokens; |
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} |
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public function getDepth($css) { |
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$parts = $css->splitOnToken(Tokenizer::COLON); |
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return count($this->split($parts[0])); |
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} |
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public function getPseudo($css) { |
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$parts = $css->splitOnToken(Tokenizer::COLON); |
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array_shift($parts); |
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return $parts; |
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} |
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} |
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Level-2 /
Transphporm
