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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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use GetSky\ParserExpressions\RuleInterface; |
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/** |
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* The zero-or-more operators consume zero or more consecutive |
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* repetitions of their sub-expression e. These operators always |
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* behave greedily, consuming as much input as possible and never |
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* backtracking. |
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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 ZeroOrMore extends AbstractRule |
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{ |
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/** |
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* @var \GetSky\ParserExpressions\RuleInterface |
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*/ |
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protected $rule; |
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/** |
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* @param array|string|RuleInterface $rule |
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* @param string $name |
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* @param callable $action |
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*/ |
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public function __construct($rule, $name = "ZeroOrMore", callable $action = null) |
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{ |
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$this->rule = $this->toRule($rule); |
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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 $context) |
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{ |
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$firstIndex = $index = $context->getCursor(); |
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$string = ''; |
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$result = new Result($this->name); |
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$context->increaseDepth(); |
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while ($value = $this->rule->scan($context)) { |
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if ($value instanceof Result) { |
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$result->addChild($value); |
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$string .= $value->getValue(); |
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$index = $context->getCursor(); |
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} |
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} |
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$context->decreaseDepth(); |
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$context->setCursor($index); |
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if ($firstIndex != $index) { |
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$result->setValue($string, $firstIndex); |
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$this->action($result); |
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return $result; |
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} |
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return true; |
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} |
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} |
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JimmDiGrizli /
RoyalStag
