<?php
/************************************************************************/
/* AChecker                                                             */
/************************************************************************/
/* Copyright (c) 2008 by Greg Gay, Cindy Li                             */
/* Adaptive Technology Resource Centre / University of Toronto          */
/*                                                                      */
/* This program is free software. You can redistribute it and/or        */
/* modify it under the terms of the GNU General Public License          */
/* as published by the Free Software Foundation.                        */
/************************************************************************/

/**
* LanguageParser
* Class for parsing XML language info and returning a Language Object
* @access	public
* @author	Joel Kronenberg
* @package	Language
*/
class LanguageParser {

	// all private
	var $parser; // the XML handler
	var $language_rows = array(); // the language data used for creating the Language Object
	var $character_data; // tmp variable for storing the data
	var $element_path; // array of element paths (basically a stack)
	var $row_num;

	function LanguageParser() {
		$this->parser = xml_parser_create(''); 

		xml_set_object($this->parser, $this);
		xml_parser_set_option($this->parser, XML_OPTION_CASE_FOLDING, false); /* conform to W3C specs */
		xml_set_element_handler($this->parser, 'startElement', 'endElement');
		xml_set_character_data_handler($this->parser, 'characterData');
	}

	// public
	function parse($xml_data) {
		$this->element_path   = array();
		$this->language_rows  = array();
		$this->character_data = '';
		$this->row_num        = 0;
		xml_parse($this->parser, $xml_data, TRUE);
	}

	// public
	function getLanguage($row_num) {
		return new Language($this->language_rows[$row_num]);
	}

	// public
	function getLanguageEditor($row_num) {
		require_once(AC_INCLUDE_PATH.'classes/Language/LanguageEditor.class.php');
		return new LanguageEditor($this->language_rows[$row_num]);
	}

	// private
	function startElement($parser, $name, $attributes) {
		array_push($this->element_path, $name);

		if ($this->element_path == array('language')) {
			$this->language_rows[$this->row_num]['language_code'] = $attributes['code'];
		}
   }

	// private
	/* called when an element ends */
	/* removed the current element from the $path */
	function endElement($parser, $name) {
		if ($this->element_path == array('language', 'achecker-version')) {
			$this->language_rows[$this->row_num]['version'] = trim($this->character_data);

		} else if ($this->element_path === array('language', 'charset')) {
			$this->language_rows[$this->row_num]['charset'] = trim($this->character_data);

		} else if ($this->element_path === array('language', 'reg-exp')) {
			$this->language_rows[$this->row_num]['reg_exp'] = trim($this->character_data);

		} else if ($this->element_path === array('language', 'native-name')) {
			$this->language_rows[$this->row_num]['native_name'] = trim($this->character_data);

		} else if ($this->element_path === array('language', 'english-name')) {
			$this->language_rows[$this->row_num]['english_name'] = trim($this->character_data);

		} else if ($this->element_path === array('language', 'status')) {
			$this->language_rows[$this->row_num]['status'] = trim($this->character_data);

		} else if ($this->element_path === array('language')) {
			$this->row_num++;
		}

		array_pop($this->element_path);
		$this->character_data = '';
	}

	// private
   	function characterData($parser, $data){
		$this->character_data .= $data;
	}

	// public
	function getNumLanguages() {
		return count($this->language_rows);
	}
}



?>