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<?php |
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namespace Vanderlee\Comprehend\Parser\Structure; |
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use InvalidArgumentException; |
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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 SequenceParser. |
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* |
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* @author Martijn |
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*/ |
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class Sequence extends IterableParser |
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{ |
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use SpacingTrait; |
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public function __construct(...$arguments) |
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{ |
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if (empty($arguments)) { |
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throw new InvalidArgumentException('No arguments'); |
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} |
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$this->parsers = self::getArguments($arguments, false); |
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} |
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142 |
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protected function parse(&$input, $offset, Context $context) |
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{ |
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$childMatches = []; |
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$this->pushSpacer($context); |
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$total = 0; |
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/** @var Parser $parser */ |
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foreach ($this->parsers as $parser) { |
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if ($total > 0) { |
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$skip = $context->skipSpacing($input, $offset + $total); |
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if ($skip === false) { |
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return $this->failure($input, $offset, $total); |
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} |
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$total += $skip; |
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} |
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$match = $parser->parse($input, $offset + $total, $context); |
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$total += $match->length; |
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if (!($match instanceof Success)) { // must match |
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$this->popSpacer($context); |
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return $this->failure($input, $offset, $total); |
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} |
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$childMatches[] = $match; |
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} |
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$this->popSpacer($context); |
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return $this->success($input, $offset, $total, $childMatches); |
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} |
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/** |
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* Add one or more parsers to the end of this sequence. |
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* |
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* @param string[]|int[]|Parser[] $arguments |
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* |
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* @return $this |
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*/ |
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public function add(...$arguments) |
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{ |
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$this->parsers = array_merge($this->parsers, self::getArguments($arguments)); |
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return $this; |
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} |
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public function __toString() |
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{ |
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return '( ' . implode(' ', $this->parsers) . ' )'; |
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} |
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} |
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vanderlee /
Comprehend
