<?php
/**
 * Harmony
 * Copyright (c) 2008 Maxime Bouroumeau-Fuseau
 *
 * 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.
 *
 * @category Harmony
 * @package Harmony_Script
 * @subpackage Harmony_Script_Context
 * @author Maxime Bouroumeau-Fuseau
 * @copyright 2008 (c) Maxime Bouroumeau-Fuseau
 * @license http://www.opensource.org/licenses/mit-license.php
 * @link http://www.harmony-framework.com
 */

/** Harmony_Script_Context */
require_once 'Harmony/Script/Context.php';

/**
 * Handles functions
 * 
 * @category Harmony
 * @package Harmony_Script 
 * @subpackage Harmony_Script_Context
 * @copyright 2008 (c) Maxime Bouroumeau-Fuseau
 * @license http://www.opensource.org/licenses/mit-license.php
 */
class Harmony_Script_Context_Function extends Harmony_Script_Context
{
	/**
	 * Optional arguments
	 * 
	 * @var array
	 */
	protected $_optionalArgs = array();
	
	/**
	 * Whether it's a native function
	 * 
	 * @var bool
	 */
	protected $_isNative = false;
	
	/**
	 * Gets the function name
	 */
	public function tokenString($text)
	{
		if ($this->hasParam('method')) {
			if ($this->getParam('static')) {
				/* static method */
				$this->_js .= $text . ' = function';
			} else {
				/* method */
				$this->_js .= $text . ': function';
			}
		} else {
			/* function */
			$this->_js .= 'function ' . $text;
		}
	}
	
	/**
	 * Arguments list
	 */
	public function tokenParenthesesStart($text)
	{
		/* gets arguments */
		$args = $this->getParser()->enterContext('Arguments');
		$reqArgs = array();
		
		/* stores optional arguments separatly */
		for($i = 0, $c = count($args); $i < $c; $i++) {
			if (empty($args[$i][1])) {
				$reqArgs[] = $args[$i][0];
			} else {
				$this->_optionalArgs[$i] = $args[$i];
			}
		}
		
		$this->_js .= '(' . implode(',', $reqArgs) . ")\n";
	}
	
	/**
	 * If it's a native function, the first comment after the
	 * argument list should be the javascript code
	 */
	public function tokenComment($text)
	{
		if ($this->hasParam('docComment')) {
			if (!preg_match('/@harmony-native/', $this->getParam('docComment'))) {
				return;
			}
		} else {
			return;
		}
		
		$text = trim($text, '/*');
		$this->_js .= $text;
		$this->_isNative = true;
	}
	
	/**
	 * In interfaces, functions end with ;
	 */
	public function tokenLineEnd($text)
	{
		/* native function, no more action */
		if ($this->_isNative) {
			$this->exitContext($this->_js);
			return;
		}
		
		$this->_js .= '{}';
		$this->exitContext($this->_js);
	}
	
	/**
	 * Function core start
	 */
	public function tokenCurlyBracesStart($text)
	{
		$block = $this->getParser()->enterContext('Block');
		
		/* native function, no more action */
		if ($this->_isNative) {
			$this->exitContext($this->_js);
			return;
		}
		
		$this->_js .= "{\n";

		/* defines variables for each optional arguments */
		foreach ($this->_optionalArgs as $i => $arg) {
			$this->_js .= 'var ' . $arg[0] . ' = arguments.length >= ' 
					    . ($i + 1) . ' ? arguments[' . $i . '] : ' . $arg[1] . ";\n";
		}
		
		$this->_js .= $block . '}';
		$this->exitContext($this->_js);
	}
}