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<?php declare(strict_types=1); |
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/* |
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* This file is part of the pinepain/js-sandbox PHP library. |
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* |
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* Copyright (c) 2016-2017 Bogdan Padalko <[email protected]> |
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* |
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* Licensed under the MIT license: http://opensource.org/licenses/MIT |
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* |
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* For the full copyright and license information, please view the |
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* LICENSE file that was distributed with this source or visit |
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* http://opensource.org/licenses/MIT |
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*/ |
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namespace Pinepain\JsSandbox\Wrappers\FunctionComponents; |
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use Pinepain\JsSandbox\Exceptions\NativeException; |
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use Pinepain\JsSandbox\Extractors\Definition\ExtractorDefinitionInterface; |
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use Pinepain\JsSandbox\Extractors\ExtractorException; |
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use Pinepain\JsSandbox\Extractors\ExtractorInterface; |
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use Pinepain\JsSandbox\Specs\FunctionSpecInterface; |
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use Pinepain\JsSandbox\Specs\Parameters\ParameterSpecInterface; |
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use V8\Context; |
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use V8\FunctionCallbackInfo; |
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use V8\Value; |
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class ArgumentsExtractor implements ArgumentsExtractorInterface |
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{ |
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/** |
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* @var ExtractorInterface |
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*/ |
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private $extractor; |
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public function __construct(ExtractorInterface $extractor) |
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{ |
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$this->extractor = $extractor; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function extract(FunctionCallbackInfo $args, FunctionSpecInterface $spec): array |
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{ |
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$parameters_list = $spec->getParameters(); |
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// this check should be done on higher level |
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// this check is handled as missed required parameter exception |
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// like https://wiki.php.net/rfc/too_few_args |
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// We run this check as it doesn't make sense to start args unpacking if we know that function call requirements are not fulfilled |
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if ($args->length() < $parameters_list->getNumberOfRequiredParameters()) { |
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throw new NativeException("Too few arguments passed: expected at least {$parameters_list->getNumberOfRequiredParameters()}, given {$args->length()}"); |
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} |
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// TODO: this is rather warning then exception |
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//Method call uses 3 parameters, but method signature uses 3 parameters |
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if ($args->length() > $parameters_list->getNumberOfParameters() && !$parameters_list->isVariadic()) { |
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throw new NativeException("Too many arguments passed: expected no more than {$parameters_list->getNumberOfParameters()}, given {$args->length()}"); |
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} |
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return $this->extractUnrolled($args->getContext(), $args->arguments(), $parameters_list->getParameters()); |
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} |
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/** |
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* @param Context $context |
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* @param Value[] $arguments |
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* @param ParameterSpecInterface[] $specs |
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* |
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* @return array |
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* @throws NativeException |
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*/ |
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public function extractUnrolled(Context $context, array $arguments, array $specs) |
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{ |
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$extracted_args = []; |
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$position = 0; |
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/** @var ParameterSpecInterface $spec */ |
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foreach ($specs as $spec) { |
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if ($spec->isVariadic()) { |
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// current argument is variadic and the rest of passed arguments goes to it |
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$variadic_args = $this->extractVariadicArguments($context, $arguments, $spec->getExtractorDefinition(), $position); |
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$extracted_args = array_merge($extracted_args, $variadic_args); |
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// variadic argument is the last possible argument |
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break; |
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} |
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// if no arguments left, we interpret any left as undefined |
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if (empty($arguments)) { |
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if (!$spec->isOptional()) { |
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throw new NativeException("Missing argument {$position}"); |
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} |
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$extracted_args[] = $spec->getDefaultValue(); |
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} else { |
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// extract current argument |
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$argument = array_shift($arguments); |
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$extracted_args[] = $this->extractPlainArgument($context, $argument, $spec->getExtractorDefinition(), $position); |
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} |
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$position++; |
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} |
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return $extracted_args; |
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} |
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/** |
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* @param Context $context |
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* @param Value[] $arguments |
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* @param ExtractorDefinitionInterface $definition |
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* @param int $position |
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* |
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* @return array |
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*/ |
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public function extractVariadicArguments(Context $context, array $arguments, ExtractorDefinitionInterface $definition, int $position): array |
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{ |
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$out = []; |
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foreach ($arguments as $argument) { |
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$out[] = $this->extractPlainArgument($context, $argument, $definition, $position++); |
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} |
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return $out; |
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} |
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/** |
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* @param Context $context |
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* @param Value $argument |
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* @param ExtractorDefinitionInterface $definition |
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* @param int $position |
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* |
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* @return mixed |
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* @throws NativeException |
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*/ |
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public function extractPlainArgument(Context $context, Value $argument, ExtractorDefinitionInterface $definition, int $position) |
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{ |
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try { |
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return $this->extractor->extract($context, $argument, $definition); |
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} catch (ExtractorException $e) { |
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throw new NativeException("Failed to extract argument {$position}: {$e->getMessage()}"); |
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} |
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} |
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} |
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pinepain /
js-sandbox
