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<?php |
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/** |
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* This file is part of Railt package. |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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declare(strict_types=1); |
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namespace Railt\SDL\Frontend; |
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use Railt\Io\Readable; |
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use Railt\Parser\Ast\RuleInterface; |
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use Railt\SDL\Frontend\Builder\Factory; |
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use Railt\SDL\IR\Definition; |
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/** |
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* Class Builder |
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*/ |
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class Builder |
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{ |
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/** |
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* @var Factory |
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*/ |
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private $factory; |
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/** |
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* Builder constructor. |
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*/ |
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public function __construct() |
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{ |
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$this->factory = new Factory(); |
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} |
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/** |
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* @param Readable $readable |
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* @param RuleInterface $ast |
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* @return \Generator|RuleInterface[]|Definition[] |
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* @throws \LogicException |
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*/ |
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public function build(Readable $readable, RuleInterface $ast) |
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{ |
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$iterator = $this->forEach($readable, $ast); |
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while ($iterator->valid()) { |
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[$key, $value] = [$iterator->key(), $iterator->current()]; |
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if ($value instanceof RuleInterface) { |
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yield from $children = $this->build($readable, $value); |
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$iterator->send($children->getReturn()); |
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continue; |
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} |
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$iterator->send(yield $key => $value); |
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} |
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return $iterator->getReturn(); |
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} |
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/** |
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* @param Readable $readable |
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* @param RuleInterface $ast |
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* @return mixed|null |
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* @throws \LogicException |
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*/ |
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public function reduce(Readable $readable, RuleInterface $ast) |
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{ |
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$iterator = $this->build($readable, $ast); |
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while ($iterator->valid()) { |
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$iterator->send($iterator->current()); |
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} |
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return $iterator->getReturn(); |
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} |
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/** |
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* @param Readable $readable |
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* @param RuleInterface $ast |
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* @return \Generator |
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* @throws \LogicException |
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*/ |
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private function forEach(Readable $readable, RuleInterface $ast): \Generator |
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{ |
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$builder = $this->factory->resolve($readable, $ast); |
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$result = $builder->build($readable, $ast); |
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if (\is_iterable($result)) { |
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yield from $result; |
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} |
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return $result instanceof \Generator ? $result->getReturn() : $result; |
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} |
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} |
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railt /
sdl
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This check marks access to variables or properties that have not been declared yet. While PHP has no explicit notion of declaring a variable, accessing it before a value is assigned to it is most likely a bug.