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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; |
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use Railt\Compiler\Exception\IncludeNotFoundException; |
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use Railt\Compiler\Exception\UnrecognizedTokenException; |
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use Railt\Compiler\Grammar\PP2\Lexer; |
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use Railt\Compiler\Grammar\PP2\Parser; |
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use Railt\Compiler\Reader\GrammarInterface; |
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use Railt\Compiler\Reader\Result; |
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use Railt\Io\File; |
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use Railt\Io\Readable; |
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use Railt\Lexer\LexerInterface; |
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use Railt\Lexer\Result\Eoi; |
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use Railt\Lexer\Result\Unknown; |
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use Railt\Lexer\TokenInterface; |
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/** |
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* Class Grammar |
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*/ |
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class PP2 implements GrammarInterface |
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{ |
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/** |
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* @var LexerInterface |
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*/ |
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private $lexer; |
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/** |
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* @var PP2 |
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*/ |
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private $parser; |
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/** |
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* Reader constructor. |
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*/ |
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public function __construct() |
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{ |
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$this->lexer = new Lexer(); |
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$this->parser = new Parser(); |
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} |
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/** |
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* @param Readable $input |
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* @return GrammarInterface |
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* @throws \Railt\Io\Exception\ExternalFileException |
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* @throws \Railt\Io\Exception\NotReadableException |
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*/ |
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public function add(Readable $input): GrammarInterface |
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{ |
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/** @var Readable $file */ |
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foreach ($this->lex($input) as $file => $token) { |
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$this->parser->process($file, $token); |
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} |
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return $this; |
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} |
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/** |
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* @param Readable $input |
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* @return \Traversable |
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* @throws \Railt\Io\Exception\NotReadableException |
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* @throws \Railt\Io\Exception\ExternalFileException |
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*/ |
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private function lex(Readable $input): \Traversable |
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{ |
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$tokens = $this->lexer->lex($input); |
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foreach ($tokens as $token) { |
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if ($token instanceof Unknown) { |
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$error = \sprintf('Unrecognized token "%s" (%s)', $token->value(), $token->name()); |
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throw (new UnrecognizedTokenException($error))->throwsIn($input, $token->offset()); |
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} |
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if ($token instanceof Eoi) { |
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continue; |
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} |
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if ($token->name() === Lexer::T_INCLUDE) { |
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yield from $this->lex($this->include($input, $token)); |
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continue; |
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} |
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yield $input => $token; |
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} |
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} |
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/** |
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* @param Readable $from |
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* @param TokenInterface $token |
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* @return Readable |
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* @throws \Railt\Io\Exception\NotReadableException |
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* @throws \Railt\Io\Exception\ExternalFileException |
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*/ |
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private function include(Readable $from, TokenInterface $token): Readable |
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{ |
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$path = \trim($token->value(1), " \t\n\r\0\x0B\"'"); |
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foreach (['.pp2', ''] as $extension) { |
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$file = \dirname($from->getPathname()) . '/' . $path . $extension; |
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if (\is_file($file)) { |
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return File::fromPathname($file); |
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} |
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} |
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$error = \sprintf('Could not read external grammar file "%s"', $path); |
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throw (new IncludeNotFoundException($error))->throwsIn($from, $token->offset()); |
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} |
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/** |
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* @return Result |
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*/ |
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public function make(): Result |
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{ |
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return $this->parser->getResult(); |
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} |
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} |
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railt /
compiler
Loading history...
Our type inference engine has found an assignment to a property that is incompatible with the declared type of that property.
Either this assignment is in error or the assigned type should be added to the documentation/type hint for that property..