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<?php

namespace PhpParser\Unserializer;

use DomainException;
use PhpParser\Unserializer;
use XMLReader;

/**
 * @deprecated
 */
class XML implements Unserializer
{
    protected $reader;

public function __construct() {
        $this->reader = new XMLReader;
    }

public function unserialize($string) {
        $this->reader->XML($string);

$this->reader->read();
        if ('AST' !== $this->reader->name) {
            throw new DomainException('AST root element not found');
        }

return $this->read($this->reader->depth);
    }

protected function read($depthLimit, $throw = true, &$nodeFound = null) {
        $nodeFound = true;
        while ($this->reader->read() && $depthLimit < $this->reader->depth) {
            if (XMLReader::ELEMENT !== $this->reader->nodeType) {
                continue;
            }

if ('node' === $this->reader->prefix) {
                return $this->readNode();
            } elseif ('scalar' === $this->reader->prefix) {
                return $this->readScalar();
            } elseif ('comment' === $this->reader->name) {
                return $this->readComment();
            } else {
                throw new DomainException(sprintf('Unexpected node of type "%s"', $this->reader->name));
            }
        }

$nodeFound = false;
        if ($throw) {
            throw new DomainException('Expected node or scalar');
        }
    }

protected function readNode() {
        $className = $this->getClassNameFromType($this->reader->localName);

// create the node without calling it's constructor
        $node = unserialize(
            sprintf(
                "O:%d:\"%s\":1:{s:13:\"\0*\0attributes\";a:0:{}}",
                strlen($className), $className
            )
        );

$depthLimit = $this->reader->depth;
        while ($this->reader->read() && $depthLimit < $this->reader->depth) {
            if (XMLReader::ELEMENT !== $this->reader->nodeType) {
                continue;
            }

$type = $this->reader->prefix;
            if ('subNode' !== $type && 'attribute' !== $type) {
                throw new DomainException(
                    sprintf('Expected sub node or attribute, got node of type "%s"', $this->reader->name)
                );
            }

$name = $this->reader->localName;
            $value = $this->read($this->reader->depth);

if ('subNode' === $type) {
                $node->$name = $value;
            } else {
                $node->setAttribute($name, $value);
            }
        }

return $node;
    }

protected function readScalar() {
        switch ($name = $this->reader->localName) {
            case 'array':
                $depth = $this->reader->depth;
                $array = array();
                while (true) {
                    $node = $this->read($depth, false, $nodeFound);
                    if (!$nodeFound) {
                        break;
                    }
                    $array[] = $node;
                }
                return $array;
            case 'string':
                return $this->reader->readString();
            case 'int':
                return $this->parseInt($this->reader->readString());
            case 'float':
                $text = $this->reader->readString();
                if (false === $float = filter_var($text, FILTER_VALIDATE_FLOAT)) {
                    throw new DomainException(sprintf('"%s" is not a valid float', $text));
                }
                return $float;
            case 'true':
            case 'false':
            case 'null':
                if (!$this->reader->isEmptyElement) {
                    throw new DomainException(sprintf('"%s" scalar must be empty', $name));
                }
                return constant($name);
            default:
                throw new DomainException(sprintf('Unknown scalar type "%s"', $name));
        }
    }

private function parseInt($text) {
        if (false === $int = filter_var($text, FILTER_VALIDATE_INT)) {
            throw new DomainException(sprintf('"%s" is not a valid integer', $text));
        }
        return $int;
    }

protected function readComment() {
        $className = $this->reader->getAttribute('isDocComment') === 'true'
            ? 'PhpParser\Comment\Doc'
            : 'PhpParser\Comment'
        ;
        return new $className(
            $this->reader->readString(),
            $this->parseInt($this->reader->getAttribute('line'))
        );
    }

protected function getClassNameFromType($type) {
        $className = 'PhpParser\\Node\\' . strtr($type, '_', '\\');
        if (!class_exists($className)) {
            $className .= '_';
        }
        if (!class_exists($className)) {
            throw new DomainException(sprintf('Unknown node type "%s"', $type));
        }
        return $className;
    }
}