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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\Grammar\PP2; |
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use Railt\Compiler\Reader\Result; |
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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 Parser |
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*/ |
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class Parser |
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{ |
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private const STATE_CONFIGURE = 0x00; |
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private const STATE_TOKEN = 0x01; |
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private const STATE_PRODUCTIONS = 0x02; |
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/** |
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* @var array|ResolverInterface[] |
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*/ |
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private $resolvers; |
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/** |
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* Parser constructor. |
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*/ |
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public function __construct() |
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{ |
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$tokens = new TokenResolver(); |
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$pragmas = new PragmaResolver(); |
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$rules = new RuleResolver($tokens); |
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$this->resolvers = [ |
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self::STATE_TOKEN => $tokens, |
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self::STATE_CONFIGURE => $pragmas, |
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self::STATE_PRODUCTIONS => $rules, |
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]; |
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} |
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/** |
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* @param Readable $file |
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* @param TokenInterface $token |
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*/ |
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public function process(Readable $file, TokenInterface $token): void |
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{ |
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$this->resolvers[$this->getState($token)]->resolve($file, $token); |
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} |
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/** |
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* @param TokenInterface $token |
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* @return int |
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*/ |
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private function getState(TokenInterface $token): int |
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{ |
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switch ($token->name()) { |
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case 'T_PRAGMA': |
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return self::STATE_CONFIGURE; |
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case 'T_TOKEN': |
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case 'T_SKIP': |
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return self::STATE_TOKEN; |
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default: |
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return self::STATE_PRODUCTIONS; |
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} |
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} |
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/** |
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* @return Result |
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*/ |
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public function getResult(): Result |
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{ |
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return new Result( |
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$this->resolvers[self::STATE_CONFIGURE], |
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$this->resolvers[self::STATE_TOKEN], |
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$this->resolvers[self::STATE_PRODUCTIONS] |
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); |
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} |
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} |
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railt /
compiler
