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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\UnknownPragmaException; |
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use Railt\Compiler\Reader\Resolver\PragmaResolver\ConfigResolver; |
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use Railt\Io\Readable; |
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use Railt\Lexer\TokenInterface; |
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use Railt\Parser\Configuration; |
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/** |
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* Class PragmaResolver |
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*/ |
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class PragmaResolver implements ResolverInterface |
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{ |
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/** |
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* @var string |
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*/ |
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private const PARSER_RESOLVER = 'parser'; |
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/** |
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* @var array|ConfigResolver[] |
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*/ |
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private $resolvers; |
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/** |
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* @var array |
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*/ |
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private $configs = []; |
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/** |
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* PragmaResolver constructor. |
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*/ |
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public function __construct() |
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{ |
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$this->bootResolvers(); |
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} |
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/** |
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* @return void |
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*/ |
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private function bootResolvers(): void |
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{ |
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$this->resolvers = [ |
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self::PARSER_RESOLVER => new ConfigResolver(self::PARSER_RESOLVER, [ |
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Configuration::PRAGMA_ROOT, |
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Configuration::PRAGMA_LOOKAHEAD, |
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Configuration::PRAGMA_RUNTIME |
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]) |
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]; |
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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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public function resolve(Readable $readable, TokenInterface $token): void |
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{ |
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[$name, $value] = [$token->value(1), $token->value(2)]; |
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foreach ($this->resolvers as $group => $resolver) { |
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if ($resolver->match($name)) { |
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$name = $this->resolvePragmaName($readable, $token, $resolver->resolve($name)); |
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$this->set($group, $name, $value); |
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return; |
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} |
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} |
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} |
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/** |
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* @param string $group |
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* @param string $name |
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* @param string $value |
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*/ |
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private function set(string $group, string $name, string $value): void |
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{ |
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if (! \array_key_exists($group, $this->configs)) { |
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$this->configs[$group] = []; |
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} |
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$this->configs[$group][$name] = $value; |
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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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* @param null|string $name |
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* @return string |
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* @throws \Railt\Io\Exception\ExternalFileException |
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*/ |
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private function resolvePragmaName(Readable $readable, TokenInterface $token, ?string $name): string |
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{ |
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if ($name === null) { |
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$error = \vsprintf('Unknown configuration pragma rule "%s" with value "%s"', [ |
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$token->value(1), |
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$token->value(2), |
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]); |
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throw (new UnknownPragmaException($error))->throwsIn($readable, $token->offset()); |
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} |
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return $name; |
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} |
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/** |
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* @param string $group |
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* @return iterable |
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*/ |
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public function all(string $group): iterable |
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{ |
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return $this->configs[$group] ?? []; |
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} |
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} |
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This error can happen if you refactor code and forget to move the variable initialization.
Let’s take a look at a simple example:
The above code is perfectly fine. Now imagine that we re-order the statements:
In that case,
$x
would be read before it is initialized. This was a very basic example, however the principle is the same for the found issue.