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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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* This rule is triggered at the first match.The choice operator e1 / e2 |
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* first invokes e1, and if e1 succeeds, returns its result immediately. |
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* Otherwise, if e1 fails, then the choice operator backtracks to the |
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* original input position at which it invoked e1, but then calls e2 |
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* instead, returning e2's result. |
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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 FirstOf 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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* @var string |
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*/ |
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protected $name; |
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/** |
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* @param array $rules Array with subrules. |
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* @param string $name Label for rule. |
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* @param callable $action |
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*/ |
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public function __construct(array $rules, $name = "FirstOf", 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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1 |
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public function scan(Context $context) |
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{ |
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1 |
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$index = $context->getCursor(); |
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1 |
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$context->increaseDepth(); |
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1 |
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foreach ($this->rules as $rule) { |
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$value = $rule->scan($context); |
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1 |
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if ($value instanceof Result) { |
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$result = new Result($this->name); |
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$result->addChild($value); |
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1 |
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$result->setValue($value->getValue(), $index); |
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1 |
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$this->action($result); |
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return $result; |
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} |
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1 |
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$context->setCursor($index); |
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} |
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1 |
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$context->decreaseDepth(); |
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1 |
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$context->setCursor($index); |
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1 |
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$context->error($this, $index); |
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1 |
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return false; |
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} |
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} |
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JimmDiGrizli /
RoyalStag
