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3 liveuser 1 
<?php
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namespace Guzzle\Parser;
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/**
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 * Registry of parsers used by the application
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 */
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class ParserRegistry
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{
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    /** @var ParserRegistry Singleton instance */
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    protected static $instance;
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    /** @var array Array of parser instances */
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    protected $instances = array();
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    /** @var array Mapping of parser name to default class */
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    protected $mapping = array(
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        'message'      => 'Guzzle\\Parser\\Message\\MessageParser',
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        'cookie'       => 'Guzzle\\Parser\\Cookie\\CookieParser',
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        'url'          => 'Guzzle\\Parser\\Url\\UrlParser',
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        'uri_template' => 'Guzzle\\Parser\\UriTemplate\\UriTemplate',
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    );
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    /**
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     * @return self
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     * @codeCoverageIgnore
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     */
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    public static function getInstance()
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    {
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        if (!self::$instance) {
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            self::$instance = new static;
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        }
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        return self::$instance;
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    }
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    public function __construct()
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    {
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        // Use the PECL URI template parser if available
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        if (extension_loaded('uri_template')) {
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            $this->mapping['uri_template'] = 'Guzzle\\Parser\\UriTemplate\\PeclUriTemplate';
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        }
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    }
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    /**
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     * Get a parser by name from an instance
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     *
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     * @param string $name Name of the parser to retrieve
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     *
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     * @return mixed|null
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     */
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    public function getParser($name)
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    {
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        if (!isset($this->instances[$name])) {
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            if (!isset($this->mapping[$name])) {
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                return null;
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            }
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            $class = $this->mapping[$name];
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            $this->instances[$name] = new $class();
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        }
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        return $this->instances[$name];
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    }
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    /**
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     * Register a custom parser by name with the register
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     *
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     * @param string $name   Name or handle of the parser to register
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     * @param mixed  $parser Instantiated parser to register
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     */
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    public function registerParser($name, $parser)
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    {
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        $this->instances[$name] = $parser;
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    }
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}