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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 Phplrt\Contracts\Grammar\RuleInterface; |
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use Phplrt\Contracts\Lexer\BufferInterface; |
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use Phplrt\Contracts\Lexer\Exception\LexerRuntimeExceptionInterface; |
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use Phplrt\Contracts\Lexer\LexerInterface; |
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use Phplrt\Contracts\Lexer\TokenInterface; |
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use Phplrt\Contracts\Source\ReadableInterface; |
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use Phplrt\Lexer\Lexer; |
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use Phplrt\Parser\Builder\BuilderInterface; |
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use Phplrt\Parser\Exception\ParserRuntimeException; |
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use Phplrt\Parser\Parser as BaseParser; |
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use Phplrt\Source\File; |
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use Railt\SDL\Exception\SyntaxErrorException; |
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use Railt\SDL\Frontend\Ast\Location; |
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use Railt\SDL\Frontend\Ast\Node; |
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/** |
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* Class Parser |
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*/ |
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final class Parser extends BaseParser implements BuilderInterface |
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{ |
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/** |
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* @var array|\Closure[] |
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*/ |
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private array $reducers; |
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/** |
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* Parser constructor. |
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*/ |
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public function __construct() |
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{ |
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$grammar = require __DIR__ . '/grammar.php'; |
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$this->reducers = $grammar['reducers']; |
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parent::__construct($this->bootLexer($grammar), $grammar['grammar'], [ |
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parent::CONFIG_AST_BUILDER => $this, |
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parent::CONFIG_INITIAL_RULE => $grammar['initial'], |
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]); |
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} |
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/** |
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* @param array $grammar |
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* @return LexerInterface |
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*/ |
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private function bootLexer(array $grammar): LexerInterface |
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{ |
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return new Lexer($grammar['lexemes'], $grammar['skips']); |
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} |
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/** |
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* {@inheritDoc} |
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* @throws SyntaxErrorException |
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* @throws \Throwable |
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*/ |
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public function build( |
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ReadableInterface $file, |
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RuleInterface $rule, |
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TokenInterface $token, |
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$state, |
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$children |
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) { |
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try { |
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if (isset($this->reducers[$state])) { |
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return $this->reducers[$state]($children); |
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} |
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return null; |
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} catch (SyntaxErrorException $e) { |
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throw $e; |
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} catch (\Exception $e) { |
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throw SyntaxErrorException::fromToken($e->getMessage(), $file, $token); |
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} |
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} |
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/** |
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* {@inheritDoc} |
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*/ |
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public function parse($source): iterable |
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{ |
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$source = File::new($source); |
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try { |
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return parent::parse($source); |
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} catch (ParserRuntimeException|LexerRuntimeExceptionInterface $e) { |
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$token = $e->getToken(); |
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throw SyntaxErrorException::fromToken($e->getMessage(), $source, $token); |
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} |
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} |
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/** |
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* {@inheritDoc} |
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*/ |
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protected function next(ReadableInterface $source, BufferInterface $buffer, $state) |
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{ |
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$from = $buffer->current()->getOffset(); |
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$result = parent::next($source, $buffer, $state); |
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if ($result instanceof Node) { |
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$result->loc = new Location($source, $from, $buffer->current()->getOffset()); |
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} |
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return $result; |
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} |
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} |
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railt /
sdl
