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<?php |
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namespace Vanderlee\Comprehend\Parser\Structure; |
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use Vanderlee\Comprehend\Core\Context; |
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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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* Description of RepeatParser |
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* |
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* @author Martijn |
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*/ |
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class Repeat extends Parser |
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{ |
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use SpacingTrait; |
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//use GreedyTrait; |
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private $parser = null; |
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private $min = null; |
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private $max = null; |
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public function __construct($parser, $min = 0, $max = null) |
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{ |
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$this->parser = $this->getArgument($parser); |
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$this->min = $min; |
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$this->max = $max; |
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if ($this->max !== null && $this->max < $this->min) { |
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throw new \InvalidArgumentException('Invalid repeat range specified'); |
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} |
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} |
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public static function plus($parser) |
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{ |
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return new self($parser, 1, null); |
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} |
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public static function star($parser) |
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{ |
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return new self($parser, 0, null); |
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} |
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public static function optional($parser) |
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{ |
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return new self($parser, 0, 1); |
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} |
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public static function exact($parser, $times) |
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{ |
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return new self($parser, $times, $times); |
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} |
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protected function parse(&$input, $offset, Context $context) |
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{ |
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$this->pushSpacer($context); |
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$child_matches = []; |
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$match = null; |
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$length = 0; |
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do { |
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// No skipping at very start |
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$skip = $length > 0 |
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? $context->skipSpacing($input, $offset + $length) |
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: 0; |
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if ($skip !== false) { |
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$match = $this->parser->parse($input, $offset + $length + $skip, $context); |
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if ($match instanceof Success) { |
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$length += $skip + $match->length; |
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$child_matches[] = $match; |
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} |
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} |
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} while ($skip !== false && $match->match && ($this->max == null || count($child_matches) < $this->max)); |
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$match = (count($child_matches) >= $this->min) && ($this->max == null || count($child_matches) <= $this->max); |
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$this->popSpacer($context); |
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return $match |
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? $this->success($input, $offset, $length, $child_matches) |
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: $this->failure($input, $offset, $length); |
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} |
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public function __toString() |
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{ |
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// Output ABNF formatting |
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$min = $this->min > 0 |
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? $this->min |
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: ''; |
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$max = $this->max === null |
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? '' |
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: $this->max; |
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return ($min === $max |
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? $min |
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: ($min . '*' . $max)) . $this->parser; |
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} |
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} |
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vanderlee /
Comprehend
