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<?php |
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namespace Vanderlee\Comprehend\Builder; |
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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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* Dynamically (lazy) binding parser |
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* |
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* @author Martijn |
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*/ |
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class RuleBinding extends Parser |
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{ |
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use ArgumentsTrait; |
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private $rule; |
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private $arguments; |
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public function __construct(&$rule, $arguments = []) |
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{ |
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$this->rule = &$rule; |
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$this->arguments = $arguments; |
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} |
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private function getParser() |
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{ |
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$rule = &$this->rule; |
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if ($rule instanceof Parser) { |
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return clone $rule; |
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} |
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if (is_callable($rule)) { |
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// Generator function (should return Parser) |
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$instance = $rule(...$this->arguments); |
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if (!($instance instanceof Parser)) { |
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throw new \InvalidArgumentException("Generator function does not return Parser"); |
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} |
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return $instance; |
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} |
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if (is_string($rule) && class_exists($rule) && is_subclass_of($rule, Parser::class)) { |
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// Class name of a Parser class |
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return new $rule(...$this->arguments); |
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} |
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if (is_array($rule) || is_string($rule) || is_int($rule)) { |
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// S-C-S Array syntax, plain text or ASCII-code |
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return self::getArgument($rule); |
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} |
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throw new \RuntimeException(sprintf('Cannot dynamically bind definition type `%1$s`', |
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is_object($this->rule) |
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? get_class($this->rule) |
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: gettype($this->rule))); |
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} |
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protected function parse(&$input, $offset, Context $context) |
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{ |
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$match = $this->getParser()->parse($input, $offset, $context); |
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if ($match->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, $match->length); |
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} |
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public function __toString() |
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{ |
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/** @noinspection HtmlUnknownTag */ |
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return $this->rule |
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? (string)$this->getParser() |
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: '<undefined>'; |
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} |
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} |
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vanderlee /
Comprehend
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