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<?php |
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namespace Vanderlee\Comprehend\Parser\Structure; |
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use Vanderlee\Comprehend\Core\ArgumentsTrait; |
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use Vanderlee\Comprehend\Core\Context; |
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use Vanderlee\Comprehend\Parser\Parser; |
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/** |
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* Match the first parser but not the second. |
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* Essentially the same as (A - B) = (A + !B) |
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* |
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* @author Martijn |
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*/ |
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class Except extends Parser |
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{ |
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use ArgumentsTrait; |
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private $parser_match = null; |
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private $parser_not = null; |
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/** |
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* |
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* @param Parser|string $match |
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* @param Parser|string $not |
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*/ |
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public function __construct($match, $not) |
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{ |
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$this->parser_match = self::getArgument($match); |
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$this->parser_not = self::getArgument($not); |
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} |
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protected function parse(&$input, $offset, Context $context) |
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{ |
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$match = $this->parser_match->parse($input, $offset, $context); |
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$not = $this->parser_not->parse($input, $offset, $context); |
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if ($match->match && !$not->match) { |
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return $this->success($input, $offset, $match->length, $match); |
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} |
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return $this->failure($input, $offset, min($match->length, $not->length)); |
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} |
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public function __toString() |
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{ |
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return '( ' . $this->parser_match . ' - ' . $this->parser_not . ' )'; |
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} |
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} |
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vanderlee /
Comprehend
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