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<?php |
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namespace Vanderlee\Comprehend\Parser; |
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use InvalidArgumentException; |
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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\AbstractMatch; |
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use Vanderlee\Comprehend\Match\Success; |
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use Vanderlee\Comprehend\Parser\Output\AssignTrait; |
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use Vanderlee\Comprehend\Parser\Output\ResultTrait; |
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use Vanderlee\Comprehend\Parser\Output\TokenTrait; |
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abstract class Parser |
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{ |
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use ResultTrait, TokenTrait, AssignTrait; |
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/** |
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* List of callbacks to call when this parser has matched a part of the full parse. |
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* |
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* @var callable[] |
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*/ |
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private $callbacks = []; |
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protected static function parseCharacter($character) |
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{ |
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if ($character === '' || $character === null) { |
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throw new InvalidArgumentException('Empty argument'); |
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} |
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if (is_int($character)) { |
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return chr($character); |
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} elseif (mb_strlen($character) > 1) { |
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throw new InvalidArgumentException('Non-character argument'); |
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} |
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return $character; |
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} |
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/** |
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* Match the input with this parser, starting from the offset position. |
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* |
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* @param string $input |
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* @param int $offset |
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* @param Context $context |
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* |
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* @return AbstractMatch |
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*/ |
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abstract protected function parse(&$input, $offset, Context $context); |
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/** |
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* @param string $input |
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* @param int $offset |
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* |
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* @return AbstractMatch; |
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*/ |
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public function match($input, $offset = 0) |
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{ |
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if ($offset < 0) { |
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throw new InvalidArgumentException('Negative offset'); |
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} |
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return $this->parse($input, $offset, new Context())->resolve(); |
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} |
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public function __invoke($input, $offset = 0) |
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{ |
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return $this->match($input, $offset); |
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} |
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/** |
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* Create a match. |
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* |
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* @param bool $success |
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* @param string $input |
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* @param int $offset |
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* @param int $length |
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* @param Success[]|Success $successes |
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* |
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* @return AbstractMatch |
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*/ |
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protected function makeMatch($success, &$input, $offset, $length = 0, &$successes = []) |
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{ |
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return $success |
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? $this->success($input, $offset, $length, $successes) |
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: $this->failure($input, $offset); |
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} |
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/** |
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* Create a successful match. |
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* |
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* @param string $input |
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* @param int $offset |
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* @param int $length |
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* @param Success[]|Success $successes |
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* |
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* @return Success |
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*/ |
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protected function success($input, $offset, $length = 0, &$successes = []) |
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{ |
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$successes = is_array($successes) |
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? $successes |
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: [$successes]; |
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$success = new Success($length, $successes); |
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// ResultTrait |
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$success->addResultCallback(function (&$results) use ($input, $offset, $length) { |
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$text = substr($input, $offset, $length); |
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$this->resolveResultCallbacks($results, $text); |
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}); |
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// AssignTrait |
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$callbacks = $this->callbacks; |
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$success->addCustomCallback(function () use ($input, $offset, $length, $callbacks) { |
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$text = substr($input, $offset, $length); |
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$this->resolveAssignCallbacks($text); |
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foreach ($callbacks as $callback) { |
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$callback($text, $input, $offset, $length); |
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} |
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}); |
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// TokenTrait |
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$success->setTokenCallback(function (&$children) use ($input, $offset, $length) { |
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return $this->resolveToken($input, $offset, $length, $children, get_class($this)); |
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}); |
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return $success; |
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} |
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/** |
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* Create a failed match. |
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* |
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* @param string $input |
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* @param int $offset |
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* @param int $length |
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* |
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* @return Failure |
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*/ |
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protected function failure(&$input, $offset, $length = 0) |
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{ |
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return new Failure($length); |
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} |
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/** |
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* Assign a function to be called if (and only if) this parser matched successfully as part of the whole syntax. |
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* |
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* @param callable $callback |
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* |
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* @return $this |
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*/ |
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public function callback(callable $callback) |
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{ |
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$this->callbacks[] = $callback; |
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return $this; |
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} |
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abstract public function __toString(); |
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} |
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vanderlee /
Comprehend
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This check looks for parameters that have been defined for a function or method, but which are not used in the method body.