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<?php |
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namespace GetSky\ParserExpressions\Rules; |
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use GetSky\ParserExpressions\Context; |
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use GetSky\ParserExpressions\Result; |
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/** |
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* The sequence operator e1 e2 first invokes e1, and if e1 succeeds, |
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* subsequently invokes e2 on the remainder of the input string leftc |
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* unconsumed by e1, and returns the result. If either e1 or e2 fails, |
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* then the sequence expression e1 e2 fails. |
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* |
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* @package GetSky\ParserExpressions\Rules |
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* @author Alexander Getmanskii <[email protected]> |
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*/ |
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class Sequence extends AbstractRule |
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{ |
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/** |
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* @var \GetSky\ParserExpressions\RuleInterface[] Array with subrules. |
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*/ |
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protected $rules; |
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/** |
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* @param array $rules Array with subrules |
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* @param string $name |
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* @param callable $action |
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*/ |
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public function __construct(array $rules, $name = "Sequence", callable $action = null) |
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{ |
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foreach ($rules as $rule) { |
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$this->rules[] = $this->toRule($rule); |
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} |
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$this->name = (string) $name; |
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$this->action = $action; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function scan(Context $context) |
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{ |
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$index = $context->getCursor(); |
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$string = ''; |
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$result = new Result($this->name); |
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$context->increaseDepth(); |
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foreach ($this->rules as $rule) { |
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$value = $rule->scan($context); |
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if ($value === false) { |
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$context->setCursor($index); |
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return false; |
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} elseif ($value instanceof Result) { |
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$string .= $value->getValue(); |
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$result->addChild($value); |
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} |
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} |
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$context->decreaseDepth(); |
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$result->setValue($string, $index); |
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$this->action($result); |
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return $result; |
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} |
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} |
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JimmDiGrizli /
RoyalStag
