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Edit File: ParserRegistry.php

<?php

namespace Guzzle\Parser;

/**
 * Registry of parsers used by the application
 */
class ParserRegistry
{
    /** @var ParserRegistry Singleton instance */
    protected static $instance;

/** @var array Array of parser instances */
    protected $instances = array();

/** @var array Mapping of parser name to default class */
    protected $mapping = array(
        'message'      => 'Guzzle\\Parser\\Message\\MessageParser',
        'cookie'       => 'Guzzle\\Parser\\Cookie\\CookieParser',
        'url'          => 'Guzzle\\Parser\\Url\\UrlParser',
        'uri_template' => 'Guzzle\\Parser\\UriTemplate\\UriTemplate',
    );

/**
     * @return self
     * @codeCoverageIgnore
     */
    public static function getInstance()
    {
        if (!self::$instance) {
            self::$instance = new static;
        }

return self::$instance;
    }

public function __construct()
    {
        // Use the PECL URI template parser if available
        if (extension_loaded('uri_template')) {
            $this->mapping['uri_template'] = 'Guzzle\\Parser\\UriTemplate\\PeclUriTemplate';
        }
    }

/**
     * Get a parser by name from an instance
     *
     * @param string $name Name of the parser to retrieve
     *
     * @return mixed|null
     */
    public function getParser($name)
    {
        if (!isset($this->instances[$name])) {
            if (!isset($this->mapping[$name])) {
                return null;
            }
            $class = $this->mapping[$name];
            $this->instances[$name] = new $class();
        }

return $this->instances[$name];
    }

/**
     * Register a custom parser by name with the register
     *
     * @param string $name   Name or handle of the parser to register
     * @param mixed  $parser Instantiated parser to register
     */
    public function registerParser($name, $parser)
    {
        $this->instances[$name] = $parser;
    }
}

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