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<?php declare(strict_types=1); |
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/** |
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* @license http://opensource.org/licenses/mit-license.php MIT |
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* @link https://github.com/nicoSWD |
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* @author Nicolas Oelgart <[email protected]> |
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*/ |
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namespace nicoSWD\Rule\TokenStream; |
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use Closure; |
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use InvalidArgumentException; |
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use nicoSWD\Rule\Grammar\CallableUserFunctionInterface; |
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use nicoSWD\Rule\TokenStream\Exception\UndefinedVariableException; |
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use nicoSWD\Rule\TokenStream\Token\BaseToken; |
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use nicoSWD\Rule\TokenStream\Token\TokenFactory; |
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use nicoSWD\Rule\Tokenizer\TokenizerInterface; |
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class AST |
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{ |
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/** @var TokenizerInterface */ |
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private $tokenizer; |
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/** @var TokenFactory */ |
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private $tokenFactory; |
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/** @var TokenStreamFactory */ |
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private $tokenStreamFactory; |
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/** @var Closure[] */ |
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private $functions = []; |
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/** @var string[] */ |
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private $methods = []; |
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/** @var mixed[] */ |
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private $variables = []; |
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/** @var callable|null */ |
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private $variableCallback; |
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public function __construct( |
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TokenizerInterface $tokenizer, |
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TokenFactory $tokenFactory, |
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TokenStreamFactory $tokenStreamFactory |
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) { |
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$this->tokenizer = $tokenizer; |
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$this->tokenFactory = $tokenFactory; |
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$this->tokenStreamFactory = $tokenStreamFactory; |
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} |
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public function getStream(string $rule): TokenStream |
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{ |
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return $this->tokenStreamFactory->create($this->tokenizer->tokenize($rule), $this); |
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} |
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public function getMethod(string $methodName, BaseToken $token): CallableUserFunctionInterface |
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{ |
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if (empty($this->methods)) { |
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$this->registerMethods(); |
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} |
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if (!isset($this->methods[$methodName])) { |
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throw new Exception\UndefinedMethodException($methodName); |
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} |
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return new $this->methods[$methodName]($token); |
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} |
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private function registerMethods() |
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{ |
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$this->methods = $this->tokenizer->getGrammar()->getInternalMethods(); |
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} |
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public function setVariables(array $variables) |
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{ |
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$this->variables = $variables; |
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} |
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public function registerVariableCallback(callable $callback = null) |
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{ |
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$this->variableCallback = $callback; |
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} |
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public function getVariable(string $variableName): BaseToken |
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{ |
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if ($this->variableExists($variableName)) { |
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return $this->tokenFactory->createFromPHPType($this->variables[$variableName]); |
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} |
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if (is_callable($this->variableCallback)) { |
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try { |
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$value = call_user_func($this->variableCallback, $variableName); |
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return $this->tokenFactory->createFromPHPType($value); |
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} catch (\Throwable $e) { |
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throw new UndefinedVariableException($variableName, $e->getCode(), $e); |
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} |
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} |
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throw new UndefinedVariableException($variableName); |
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} |
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public function variableExists(string $variableName): bool |
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{ |
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return array_key_exists($variableName, $this->variables); |
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} |
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public function getFunction(string $functionName): Closure |
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{ |
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if (empty($this->functions)) { |
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$this->registerFunctions(); |
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} |
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if (!isset($this->functions[$functionName])) { |
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throw new Exception\UndefinedFunctionException($functionName); |
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} |
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return $this->functions[$functionName]; |
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} |
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private function registerFunctionClass(string $functionName, string $className) |
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{ |
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$this->functions[$functionName] = function (BaseToken ...$args) use ($className): BaseToken { |
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$function = new $className(); |
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if (!$function instanceof CallableUserFunctionInterface) { |
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throw new InvalidArgumentException( |
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sprintf( |
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"%s must be an instance of %s", |
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$className, |
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CallableUserFunctionInterface::class |
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) |
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); |
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} |
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return $function->call(...$args); |
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}; |
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} |
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private function registerFunctions() |
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{ |
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foreach ($this->tokenizer->getGrammar()->getInternalFunctions() as $functionName => $className) { |
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$this->registerFunctionClass($functionName, $className); |
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} |
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} |
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} |
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nicoSWD /
php-rule-parser
It seems like the type of the argument is not accepted by the function/method which you are calling.
In some cases, in particular if PHP’s automatic type-juggling kicks in this might be fine. In other cases, however this might be a bug.
We suggest to add an explicit type cast like in the following example: