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<?php |
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namespace Vanderlee\Comprehend\Parser\Terminal; |
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use InvalidArgumentException; |
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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 RangeParser. |
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* |
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* @author Martijn |
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*/ |
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class Range extends Parser |
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{ |
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use CaseSensitiveTrait; |
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private $first = null; |
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private $last = null; |
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private $in = true; |
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public function __construct($first, $last, $in = true) |
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{ |
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if ($first === null |
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&& $last === null) { |
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throw new InvalidArgumentException('Empty arguments'); |
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} |
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$this->first = $first === null |
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? null |
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: self::parseCharacter($first); |
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$this->last = $last === null |
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? null |
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: self::parseCharacter($last); |
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$this->in = (bool)$in; |
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} |
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protected function parse(&$input, $offset, Context $context) |
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{ |
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if ($offset >= mb_strlen($input)) { |
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return $this->failure($input, $offset); |
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} |
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$isSuccess = !$this->in; // By default not successful if required to match only within range |
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$this->pushCaseSensitivityToContext($context); |
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$first = ord($context->handleCase($this->first)); |
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$last = ord($context->handleCase($this->last)); |
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$ord = ord($context->handleCase($input[$offset])); |
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$this->popCaseSensitivityFromContext($context); |
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if ($first <= $ord |
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&& ($this->last === null |
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|| $ord <= $last)) { |
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$isSuccess = !$isSuccess; |
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} |
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return $isSuccess |
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? $this->success($input, $offset, 1) |
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: $this->failure($input, $offset); |
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} |
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public function __toString() |
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{ |
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return sprintf('x%02x-x%02x', ord($this->first), ord($this->last)); |
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} |
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} |
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vanderlee /
Comprehend
