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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\Compiler\Reader\Resolver; |
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use Railt\Compiler\Exception\GrammarException; |
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use Railt\Io\Readable; |
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use Railt\Lexer\TokenInterface; |
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/** |
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* Class RuleResolver |
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*/ |
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class RuleResolver implements ResolverInterface |
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{ |
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/** |
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* @var array|array[] |
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*/ |
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private $rules = []; |
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/** |
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* @var string|null |
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*/ |
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private $current; |
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/** |
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* @var array|string[] |
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*/ |
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private $keep = []; |
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/** |
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* @var array|string[] |
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*/ |
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private $delegates = []; |
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/** |
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* @var array|Readable[] |
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*/ |
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private $files = []; |
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/** |
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* @param Readable $readable |
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* @param TokenInterface $token |
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* @throws \Railt\Io\Exception\ExternalFileException |
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*/ |
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public function resolve(Readable $readable, TokenInterface $token): void |
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{ |
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if ($this->next($readable, $token)) { |
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return; |
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} |
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if (! \array_key_exists($this->current, $this->rules)) { |
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$this->rules[$this->current] = []; |
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} |
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if (! \array_key_exists($this->current, $this->files)) { |
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$this->files[$this->current] = $readable; |
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} |
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$this->rules[$this->current][] = $token; |
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} |
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/** |
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* @param Readable $readable |
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* @param TokenInterface $token |
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* @return bool |
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* @throws \Railt\Io\Exception\ExternalFileException |
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*/ |
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private function next(Readable $readable, TokenInterface $token): bool |
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{ |
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if ($token->name() === 'T_NODE_DEFINITION') { |
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$this->resolveCurrent($readable, $token); |
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return true; |
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} |
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if ($this->current === null) { |
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$error = \sprintf('Unprocessed production %s', $token->value(0)); |
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throw (new GrammarException($error))->throwsIn($readable, $token->offset()); |
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} |
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return false; |
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} |
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/** |
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* @param Readable $readable |
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* @param TokenInterface $token |
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* @throws \Railt\Io\Exception\ExternalFileException |
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*/ |
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private function resolveCurrent(Readable $readable, TokenInterface $token): void |
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{ |
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[$name, $delegate, $keep] = [ |
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\trim($token->value(1), '#'), |
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$token->value(2), |
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$token->value(1){0} === '#' |
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]; |
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$this->current = $name; |
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if ($keep) { |
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$this->keep[] = $this->current; |
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} |
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if ($delegate) { |
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if (! \class_exists($delegate)) { |
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$error = \sprintf('Could not found class "%s" to delegate rule "%s"', $delegate, $name); |
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throw (new GrammarException($error))->throwsIn($readable, $token->offset()); |
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} |
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$this->delegates[$this->current] = $delegate; |
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} |
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} |
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/** |
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* @return array|array[] |
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*/ |
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public function getRules(): array |
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{ |
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return $this->rules; |
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} |
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/** |
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* @return array|string[] |
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*/ |
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public function getKeep(): array |
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{ |
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return $this->keep; |
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} |
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/** |
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* @return array|string[] |
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*/ |
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public function getDelegates(): array |
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{ |
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return $this->delegates; |
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} |
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/** |
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* @return array |
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*/ |
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public function getFiles(): array |
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{ |
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return $this->files; |
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} |
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} |
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railt /
compiler
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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.