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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 2015 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 1.0 */ |
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namespace Transphporm\Parser; |
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class CssToXpath { |
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private $specialChars = [' ', '.', '>', '~', '#', ':', '[', ']']; |
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private $translators = []; |
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private $css; |
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private $depth; |
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private static $instances = []; |
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public function __construct($css, Value $valueParser, $prefix = '') { |
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$hash = $this->registerInstance(); |
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$this->valueParser = $valueParser; |
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$this->css = str_replace([' >', '> '],['>', '>'], trim($css)); |
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$this->translators = [ |
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' ' => function($string) use ($prefix) { return '//' . $prefix . $string; }, |
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'' => function($string) use ($prefix) { return '/' . $prefix . $string; }, |
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'>' => function($string) use ($prefix) { return '/' . $prefix . $string; }, |
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'#' => function($string) { return '[@id=\'' . $string . '\']'; }, |
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'.' => function($string) { return '[contains(concat(\' \', normalize-space(@class), \' \'), \' ' . $string . ' \')]'; }, |
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'[' => function($string, $xpath) use($hash) { return '[' .'php:function(\'\Transphporm\Parser\CssToXpath::processAttr\', \'' . $string . '\', ., "' . $hash . '")' . ']'; }, |
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']' => function() { return ''; } |
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]; |
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} |
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public function __destruct() { |
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unset(self::$instances[spl_object_hash($this)]); |
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} |
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private function registerInstance() { |
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$hash = spl_object_hash($this); |
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self::$instances[$hash] = $this; |
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return $hash; |
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} |
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private function createSelector() { |
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$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, $hash) { |
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$comparators = ['!=', '=']; |
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$valueParser = self::$instances[$hash]->valueParser; |
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foreach ($comparators as $comparator) { |
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if (strpos($attr, $comparator) !== false) { |
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$parts = explode($comparator, $attr); |
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$parts = array_map(function($val) use ($valueParser, $element) { |
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return $valueParser->parse($val, $element[0])[0]; |
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}, $parts); |
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return self::compare($comparator, $element[0]->getAttribute($parts[0]), $parts[1]); |
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} |
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} |
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return $attr; |
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} |
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private static function compare($comparator, $a, $b) { |
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if ($comparator == '=') return $a == $b; |
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else if ($comparator == '!=') return $a != $b; |
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} |
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//split the css into indivudal functions |
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private function split($css) { |
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$selectors = []; |
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$selector = $this->createSelector(); |
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$selectors[] = $selector; |
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for ($i = 0; $i < strlen($css); $i++) { |
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if (in_array($css[$i], $this->specialChars)) { |
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$selector = $this->createSelector(); |
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$selector->type = $css[$i]; |
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$selectors[] = $selector; |
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} |
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else $selector->string .= $css[$i]; |
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} |
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return $selectors; |
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} |
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public function getXpath() { |
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$css = explode(':', $this->css)[0]; |
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$selectors = $this->split($css); |
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$this->depth = count($selectors); |
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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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public function getDepth() { |
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return $this->depth; |
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} |
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public function getPseudo() { |
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$parts = explode(':', $this->css); |
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array_shift($parts); |
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return $parts; |
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} |
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} |
Level-2 /
Transphporm
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In PHP it is possible to write to properties without declaring them. For example, the following is perfectly valid PHP code:
Generally, it is a good practice to explictly declare properties to avoid accidental typos and provide IDE auto-completion: