<?php
/**
 * Zend Framework
 *
 * LICENSE
 *
 * This source file is subject to the new BSD license that is bundled
 * with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://framework.zend.com/license/new-bsd
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@zend.com so we can send you a copy immediately.
 *
 * @category   Zend
 * @package    Zend_Translator
 * @copyright  Copyright (c) 2005-2012 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 */

namespace Zend\Translator\Adapter;
use Zend\Translator\Adapter\AbstractAdapter,
    Zend\Translator,
    Zend\Translator\Exception\InvalidArgumentException,
    Zend\Translator\Exception\InvalidFileTypeException;

/**
 * @category   Zend
 * @package    Zend_Translator
 * @copyright  Copyright (c) 2005-2012 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 */
class XmlTm extends AbstractAdapter
{
    // Internal variables
    private $_file        = false;
    private $_lang        = null;
    private $_content     = null;
    private $_tag         = null;
    private $_data        = array();

    /**
     * Load translation data (XMLTM file reader)
     *
     * @param  string  $locale    Locale/Language to add data for, identical with locale identifier,
     *                            see Zend_Locale for more information
     * @param  string  $filename  XMLTM file to add, full path must be given for access
     * @param  array   $option    OPTIONAL Options to use
     * @throws \Zend\Translator\Exception\InvalidArgumentException
     * @throws \Zend\Translator\Exception\InvalidFileTypeException
     * @return array
     */
    protected function _loadTranslationData($filename, $locale, array $options = array())
    {
        $this->_data = array();
        $this->_lang = $locale;
        if (!is_readable($filename)) {
            throw new InvalidArgumentException('Translation file \'' . $filename . '\' is not readable.');
        }

        $encoding    = $this->_findEncoding($filename);
        $this->_file = xml_parser_create($encoding);
        xml_set_object($this->_file, $this);
        xml_parser_set_option($this->_file, XML_OPTION_CASE_FOLDING, 0);
        xml_set_element_handler($this->_file, "_startElement", "_endElement");
        xml_set_character_data_handler($this->_file, "_contentElement");

        if (!xml_parse($this->_file, file_get_contents($filename))) {
            $ex = sprintf('XML error: %s at line %d of file %s',
                          xml_error_string(xml_get_error_code($this->_file)),
                          xml_get_current_line_number($this->_file),
                          $filename);
            xml_parser_free($this->_file);
            throw new InvalidFileTypeException($ex);
        }

        return $this->_data;
    }

    private function _startElement($file, $name, $attrib)
    {
        switch(strtolower($name)) {
            case 'tm:tu':
                $this->_tag     = $attrib['id'];
                $this->_content = null;
                break;
            default:
                break;
        }
    }

    private function _endElement($file, $name)
    {
        switch (strtolower($name)) {
            case 'tm:tu':
                if (!empty($this->_tag) and !empty($this->_content) or
                    (isset($this->_data[$this->_lang][$this->_tag]) === false)) {
                    $this->_data[$this->_lang][$this->_tag] = $this->_content;
                }
                $this->_tag     = null;
                $this->_content = null;
                break;

            default:
                break;
        }
    }

    private function _contentElement($file, $data)
    {
        if (($this->_tag !== null)) {
            $this->_content .= $data;
        }
    }

    private function _findEncoding($filename)
    {
        $file = file_get_contents($filename, null, null, 0, 100);
        if (strpos($file, "encoding") !== false) {
            $encoding = substr($file, strpos($file, "encoding") + 9);
            $encoding = substr($encoding, 1, strpos($encoding, $encoding[0], 1) - 1);
            return $encoding;
        }
        return 'UTF-8';
    }

    /**
     * Returns the adapter name
     *
     * @return string
     */
    public function toString()
    {
        return "XmlTm";
    }
}