<?php

/**

 * CodeIgniter

 *

 * An open source application development framework for PHP

 *

 * This content is released under the MIT License (MIT)

 *

 * Copyright (c) 2014 - 2017, British Columbia Institute of Technology

 *

 * Permission is hereby granted, free of charge, to any person obtaining a copy

 * of this software and associated documentation files (the "Software"), to deal

 * in the Software without restriction, including without limitation the rights

 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

 * copies of the Software, and to permit persons to whom the Software is

 * furnished to do so, subject to the following conditions:

 *

 * The above copyright notice and this permission notice shall be included in

 * all copies or substantial portions of the Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

 * THE SOFTWARE.

 *

 * @package	CodeIgniter

 * @author	EllisLab Dev Team

 * @copyright	Copyright (c) 2008 - 2014, EllisLab, Inc. (https://ellislab.com/)

 * @copyright	Copyright (c) 2014 - 2017, British Columbia Institute of Technology (http://bcit.ca/)

 * @license	http://opensource.org/licenses/MIT	MIT License

 * @link	https://codeigniter.com

 * @since	Version 1.0.0

 * @filesource

 */

defined('BASEPATH') OR exit('No direct script access allowed');



/**

 * Parser Class

 *

 * @package		CodeIgniter

 * @subpackage	Libraries

 * @category	Parser

 * @author		EllisLab Dev Team

 * @link		https://codeigniter.com/user_guide/libraries/parser.html

 */

class CI_Parser {



	/**

	 * Left delimiter character for pseudo vars

	 *

	 * @var string

	 */

	public $l_delim = '{';



	/**

	 * Right delimiter character for pseudo vars

	 *

	 * @var string

	 */

	public $r_delim = '}';



	/**

	 * Reference to CodeIgniter instance

	 *

	 * @var object

	 */

	protected $CI;



	// --------------------------------------------------------------------



	/**

	 * Class constructor

	 *

	 * @return	void

	 */

	public function __construct()

	{

		$this->CI =& get_instance();

		log_message('info', 'Parser Class Initialized');

	}



	// --------------------------------------------------------------------



	/**

	 * Parse a template

	 *

	 * Parses pseudo-variables contained in the specified template view,

	 * replacing them with the data in the second param

	 *

	 * @param	string

	 * @param	array

	 * @param	bool

	 * @return	string

	 */

	public function parse($template, $data, $return = FALSE)

	{

		$template = $this->CI->load->view($template, $data, TRUE);



		return $this->_parse($template, $data, $return);

	}



	// --------------------------------------------------------------------



	/**

	 * Parse a String

	 *

	 * Parses pseudo-variables contained in the specified string,

	 * replacing them with the data in the second param

	 *

	 * @param	string

	 * @param	array

	 * @param	bool

	 * @return	string

	 */

	public function parse_string($template, $data, $return = FALSE)

	{

		return $this->_parse($template, $data, $return);

	}



	// --------------------------------------------------------------------



	/**

	 * Parse a template

	 *

	 * Parses pseudo-variables contained in the specified template,

	 * replacing them with the data in the second param

	 *

	 * @param	string

	 * @param	array

	 * @param	bool

	 * @return	string

	 */

	protected function _parse($template, $data, $return = FALSE)

	{

		if ($template === '')

		{

			return FALSE;

		}



		$replace = array();

		foreach ($data as $key => $val)

		{

			$replace = array_merge(

				$replace,

				is_array($val)

					? $this->_parse_pair($key, $val, $template)

					: $this->_parse_single($key, (string) $val, $template)

			);

		}



		unset($data);

		$template = strtr($template, $replace);



		if ($return === FALSE)

		{

			$this->CI->output->append_output($template);

		}



		return $template;

	}



	// --------------------------------------------------------------------



	/**

	 * Set the left/right variable delimiters

	 *

	 * @param	string

	 * @param	string

	 * @return	void

	 */

	public function set_delimiters($l = '{', $r = '}')

	{

		$this->l_delim = $l;

		$this->r_delim = $r;

	}



	// --------------------------------------------------------------------



	/**

	 * Parse a single key/value

	 *

	 * @param	string

	 * @param	string

	 * @param	string

	 * @return	string

	 */

	protected function _parse_single($key, $val, $string)

	{

		return array($this->l_delim.$key.$this->r_delim => (string) $val);

	}



	// --------------------------------------------------------------------



	/**

	 * Parse a tag pair

	 *

	 * Parses tag pairs: {some_tag} string... {/some_tag}

	 *

	 * @param	string

	 * @param	array

	 * @param	string

	 * @return	string

	 */

	protected function _parse_pair($variable, $data, $string)

	{

		$replace = array();

		preg_match_all(

			'#'.preg_quote($this->l_delim.$variable.$this->r_delim).'(.+?)'.preg_quote($this->l_delim.'/'.$variable.$this->r_delim).'#s',

			$string,

			$matches,

			PREG_SET_ORDER

		);



		foreach ($matches as $match)

		{

			$str = '';

			foreach ($data as $row)

			{

				$temp = array();

				foreach ($row as $key => $val)

				{

					if (is_array($val))

					{

						$pair = $this->_parse_pair($key, $val, $match[1]);

						if ( ! empty($pair))

						{

							$temp = array_merge($temp, $pair);

						}



						continue;

					}



					$temp[$this->l_delim.$key.$this->r_delim] = $val;

				}



				$str .= strtr($match[1], $temp);

			}



			$replace[$match[0]] = $str;

		}



		return $replace;

	}



}

