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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\Hook; |
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/** Determines whether $element matches the pseudo rule such as nth-child() or [attribute="value"] */ |
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class PseudoMatcher { |
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private $pseudo; |
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private $dataFunction; |
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public function __construct($pseudo, DataFunction $dataFunction) { |
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$this->pseudo = $pseudo; |
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$this->dataFunction = $dataFunction; |
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} |
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public function matches($element) { |
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$matches = true; |
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foreach ($this->pseudo as $pseudo) { |
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$matches = $matches && $this->attribute($pseudo, $element) && $this->nth($pseudo, $element); |
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} |
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return $matches; |
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} |
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private function betweenBrackets($string, $openChr, $closingChr, $start = 0) { |
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$open = strpos($string, $openChr, $start); |
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$close = strpos($string, $closingChr, $open); |
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$cPos = $open+1; |
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while (($cPos = strpos($string, $openChr, $cPos+1)) !== false && $cPos < $close) $close = strpos($string, $closingChr, $close+1); |
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return substr($string, $open+1, $close-$open-1); |
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} |
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private function attribute($pseudo, $element) { |
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$pos = strpos($pseudo, '['); |
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if ($pos === false) return true; |
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$name = substr($pseudo, 0, $pos); |
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if (!is_callable([$this->dataFunction, $name])) return true; |
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$criteria = $this->betweenBrackets($pseudo, '[', ']'); |
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if (strpos($pseudo, '=') === false) { |
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$lookupValue = $this->dataFunction->$name([$criteria], $element); |
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return $lookupValue !== null; |
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} |
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list ($field, $value) = explode('=', $criteria); |
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$operator = $this->getOperator($field); |
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$field = trim($field, $operator); |
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$value = $this->parseValue(trim($value, '"')); |
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$lookupValue = $this->dataFunction->$name([$field], $element); |
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return $this->processOperator($operator, $lookupValue, $value); |
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} |
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//Currently only not is supported, but this is separated out to support others in future |
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private function processOperator($operator, $lookupValue, $value) { |
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$matched = $lookupValue == $value; |
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return $operator === '!' ? !$matched : $matched; |
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} |
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private function parseValue($value) { |
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if ($value == 'true') return true; |
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else if ($value == 'false') return false; |
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else return $value; |
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} |
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private function getOperator($field) { |
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if ($field[strlen($field)-1] == '!') { |
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return '!'; |
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} |
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else return ''; |
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} |
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private function nth($pseudo, $element) { |
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if (strpos($pseudo, 'nth-child') === 0) { |
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$criteria = $this->getBetween($pseudo, '(', ')'); |
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$num = $this->getBetween($element->getNodePath(), '[', ']'); |
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if (is_callable([$this, $criteria])) return $this->$criteria($num); |
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else return $num == $criteria; |
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} |
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return true; |
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} |
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public function attr() { |
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foreach ($this->pseudo as $pseudo) { |
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if (strpos($pseudo, 'attr') === 0) { |
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$criteria = trim($this->getBetween($pseudo, '(', ')')); |
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return $criteria; |
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} |
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} |
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return false; |
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} |
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public function header($element) { |
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if ($this->matches($element)) { |
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foreach ($this->pseudo as $pseudo) { |
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if (strpos($pseudo, 'header') === 0) return $this->getBetween($pseudo, '[', ']'); |
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} |
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} |
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} |
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private function odd($num) { |
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return $num % 2 === 1; |
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} |
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private function even($num) { |
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return $num % 2 === 0; |
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} |
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private function getBetween($string, $start, $end) { |
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$open = strpos($string, $start); |
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if ($open === false) return false; |
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$close = strpos($string, $end, $open); |
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return substr($string, $open+1, $close-$open-1); |
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} |
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public function getPseudo() { |
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return $this->pseudo; |
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} |
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} |
Level-2 /
Transphporm
