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<?php |
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namespace Vanderlee\Comprehend\Directive; |
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use DomainException; |
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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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* Description of OrDirective. |
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* |
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* @author Martijn |
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*/ |
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class Prefer extends Parser |
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{ |
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const FIRST = 'first'; |
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const LONGEST = 'longest'; |
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const SHORTEST = 'shortest'; |
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use ArgumentsTrait; |
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/** |
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* @var Parser; |
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*/ |
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private $parser = null; |
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/** |
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* One of self::*. |
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* |
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* @var int |
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*/ |
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private $preference = null; |
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/** |
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* @param mixed $preference |
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* @param mixed $parser |
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* |
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* @throws DomainException |
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*/ |
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public function __construct($preference, $parser) |
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{ |
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if (!in_array($preference, [ |
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self::FIRST, |
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self::LONGEST, |
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self::SHORTEST, |
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])) { |
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throw new DomainException('Invalid preference `' . $preference . '`'); |
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} |
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$this->preference = $preference; |
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$this->parser = self::getArgument($parser); |
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} |
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protected function parse(&$input, $offset, Context $context) |
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{ |
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$context->pushPreference($this->preference); |
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$match = $this->parser->parse($input, $offset, $context); |
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$context->popPreference(); |
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return $match; |
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} |
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public function __toString() |
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{ |
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switch ($this->preference) { |
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default: |
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case self::FIRST: |
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return (string)$this->parser; |
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case self::LONGEST: |
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return 'longest-of' . $this->parser; |
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case self::SHORTEST: |
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return 'shortest-of' . $this->parser; |
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} |
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} |
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} |
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vanderlee /
Comprehend
