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<?php

declare (strict_types=1);
namespace PhpParser;

class JsonDecoder
{
    /** @var \ReflectionClass[] Node type to reflection class map */
    private $reflectionClassCache;
    public function decode(string $json)
    {
        $value = \json_decode($json, \true);
        if (\json_last_error()) {
            throw new \RuntimeException('JSON decoding error: ' . \json_last_error_msg());
        }
        return $this->decodeRecursive($value);
    }
    private function decodeRecursive($value)
    {
        if (\is_array($value)) {
            if (isset($value['nodeType'])) {
                if ($value['nodeType'] === 'Comment' || $value['nodeType'] === 'Comment_Doc') {
                    return $this->decodeComment($value);
                }
                return $this->decodeNode($value);
            }
            return $this->decodeArray($value);
        }
        return $value;
    }
    private function decodeArray(array $array) : array
    {
        $decodedArray = [];
        foreach ($array as $key => $value) {
            $decodedArray[$key] = $this->decodeRecursive($value);
        }
        return $decodedArray;
    }
    private function decodeNode(array $value) : \PhpParser\Node
    {
        $nodeType = $value['nodeType'];
        if (!\is_string($nodeType)) {
            throw new \RuntimeException('Node type must be a string');
        }
        $reflectionClass = $this->reflectionClassFromNodeType($nodeType);
        /** @var Node $node */
        $node = $reflectionClass->newInstanceWithoutConstructor();
        if (isset($value['attributes'])) {
            if (!\is_array($value['attributes'])) {
                throw new \RuntimeException('Attributes must be an array');
            }
            $node->setAttributes($this->decodeArray($value['attributes']));
        }
        foreach ($value as $name => $subNode) {
            if ($name === 'nodeType' || $name === 'attributes') {
                continue;
            }
            $node->{$name} = $this->decodeRecursive($subNode);
        }
        return $node;
    }
    private function decodeComment(array $value) : \PhpParser\Comment
    {
        $className = $value['nodeType'] === 'Comment' ? \PhpParser\Comment::class : \PhpParser\Comment\Doc::class;
        if (!isset($value['text'])) {
            throw new \RuntimeException('Comment must have text');
        }
        return new $className($value['text'], $value['line'] ?? -1, $value['filePos'] ?? -1, $value['tokenPos'] ?? -1, $value['endLine'] ?? -1, $value['endFilePos'] ?? -1, $value['endTokenPos'] ?? -1);
    }
    private function reflectionClassFromNodeType(string $nodeType) : \ReflectionClass
    {
        if (!isset($this->reflectionClassCache[$nodeType])) {
            $className = $this->classNameFromNodeType($nodeType);
            $this->reflectionClassCache[$nodeType] = new \ReflectionClass($className);
        }
        return $this->reflectionClassCache[$nodeType];
    }
    private function classNameFromNodeType(string $nodeType) : string
    {
        $className = 'PhpParser\\Node\\' . \strtr($nodeType, '_', '\\');
        if (\class_exists($className)) {
            return $className;
        }
        $className .= '_';
        if (\class_exists($className)) {
            return $className;
        }
        throw new \RuntimeException("Unknown node type \"{$nodeType}\"");
    }
}