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<?php |
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namespace Vanderlee\Comprehend\Parser\Terminal; |
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use Exception; |
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use Vanderlee\Comprehend\Core\Context; |
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use Vanderlee\Comprehend\Match\Failure; |
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use Vanderlee\Comprehend\Match\Success; |
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use Vanderlee\Comprehend\Parser\Parser; |
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/** |
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* Matches an integer within the specified range |
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* |
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* @author Martijn |
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*/ |
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class Integer extends Parser |
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{ |
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use CaseSensitiveTrait; |
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/** |
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* List of digits to use for the different bases (up to 36) |
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* @var string |
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*/ |
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private static $set = '0123456789abcdefghijklmnopqrstuvwxyz'; |
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/** |
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* @var int|null |
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*/ |
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private $minimum; |
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/** |
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* @var int|null |
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*/ |
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private $maximum; |
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/** |
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* @var int |
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*/ |
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private $base; |
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/** |
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* @param int|null $minimum |
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* @param int|null $maximum |
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* @param int $base |
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* @throws Exception |
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*/ |
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public function __construct($minimum = 0, $maximum = null, $base = 10) |
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{ |
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if ($minimum !== null |
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&& $maximum !== null |
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&& $minimum > $maximum) { |
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throw new \Exception('Maximum must be greater than minimum'); |
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} |
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$this->setMinimum($minimum); |
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$this->setMaximum($maximum); |
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$this->base = intval($base); |
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if ($base < 2 |
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|| $base > strlen(self::$set)) { |
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throw new \Exception('Unsupported base'); |
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} |
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} |
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/** |
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* @param int|null $minimum |
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* @throws Exception |
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*/ |
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private function setMinimum($minimum) |
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{ |
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if ($minimum !== null |
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&& !is_int($minimum)) { |
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throw new Exception('Minimum must be integer or `null`'); |
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} |
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$this->minimum = $minimum; |
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} |
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/** |
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* @param int|null $maximum |
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* @throws Exception |
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*/ |
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private function setMaximum($maximum) |
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{ |
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if ($maximum !== null |
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&& !is_int($maximum)) { |
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throw new Exception('Maximum must be integer or `null`'); |
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} |
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$this->maximum = $maximum; |
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} |
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private function isInRange($integer) |
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{ |
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return ($this->minimum === null |
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|| $integer >= $this->minimum) |
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&& ($this->maximum === null |
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|| $integer <= $this->maximum); |
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} |
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/** |
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* @param string $input |
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* @param int $offset |
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* @param Context $context |
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* @return Failure|Success |
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*/ |
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protected function parse(&$input, $offset, Context $context) |
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{ |
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$this->pushCaseSensitivityToContext($context); |
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// Build pattern |
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$set0 = substr(self::$set, 0, $this->base); |
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$set1 = substr(self::$set, 1, $this->base - 1); |
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$pattern = '/(?:0|-?[' . $set1 . '][' . $set0 . ']*)/A' . ($context->isCaseSensitive() |
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? '' |
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: 'i'); |
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$this->popCaseSensitivityFromContext($context); |
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if (preg_match($pattern, $input, $match, 0, $offset) === 1) { |
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do { |
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$integer = intval($match[0], $this->base); |
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if ($this->isInRange($integer) |
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&& $match[0] !== '-') { |
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return $this->success($input, $offset, mb_strlen($match[0])); |
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} |
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$match[0] = substr($match[0], 0, -1); // strip off last char |
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} while ($match[0] !== ''); |
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} |
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return $this->failure($input, $offset); |
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} |
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/** |
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* @return string |
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*/ |
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public function __toString() |
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{ |
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return ($this->minimum === null |
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? '<-INF' |
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: ('[' . $this->minimum)) . ',' . ($this->maximum === null |
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? 'INF>' |
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: ($this->maximum . ']')); |
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} |
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} |
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vanderlee /
Comprehend
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