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<?php
/**
 * CGettextPoFile class file.
 *
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @link http://www.yiiframework.com/
 * @copyright 2008-2013 Yii Software LLC
 * @license http://www.yiiframework.com/license/
 */

/**
 * CGettextPoFile represents a PO Gettext message file.
 *
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @package system.i18n.gettext
 * @since 1.0
 */
class CGettextPoFile extends CGettextFile
{
	/**
	 * Loads messages from a PO file.
	 * @param string $file file path
	 * @param string $context message context
	 * @return array message translations (source message => translated message)
	 */
	public function load($file,$context)
	{
		$pattern='/(msgctxt\s+"(.*?(?<!\\\\))")?\s+'
			.'msgid\s+((?:".*(?<!\\\\)"\s*)+)\s+'
			.'msgstr\s+((?:".*(?<!\\\\)"\s*)+)/';
		$matches=array();
		$n=preg_match_all($pattern,file_get_contents($file),$matches);

$messages=array();
		for($i=0; $i<$n; $i++)
		{
			if($matches[2][$i]===$context)
			{
				$id=$this->decode($matches[3][$i]);
				$message=$this->decode($matches[4][$i]);
				$messages[$id]=$message;
			}
		}
		return $messages;
	}

/**
	 * Saves messages to a PO file.
	 * @param string $file file path
	 * @param array $messages message translations (message id => translated message).
	 * Note if the message has a context, the message id must be prefixed with
	 * the context with chr(4) as the separator.
	 */
	public function save($file,$messages)
	{
		$content='';
		foreach($messages as $id=>$message)
		{
			if(($pos=strpos($id,chr(4)))!==false)
			{
				$content.='msgctxt "'.substr($id,0,$pos)."\"\n";
				$id=substr($id,$pos+1);
			}
			$content.='msgid "'.$this->encode($id)."\"\n";
			$content.='msgstr "'.$this->encode($message)."\"\n\n";
		}
		file_put_contents($file,$content);
	}

/**
	 * Encodes special characters in a message.
	 * @param string $string message to be encoded
	 * @return string the encoded message
	 */
	protected function encode($string)
	{
		return str_replace(
			array('"',"\n","\t","\r"),
			array('\\"',"\\n",'\\t','\\r'),
			$string
		);
	}

/**
	 * Decodes special characters in a message.
	 * @param string $string message to be decoded
	 * @return string the decoded message
	 */
	protected function decode($string)
	{
		$string=preg_replace(
			array('/"\s+"/','/\\\\n/','/\\\\r/','/\\\\t/','/\\\\"/'),
			array('',"\n","\r","\t",'"'),
			$string
		);
		return substr(rtrim($string),1,-1);
	}
}