<?php /* SVN FILE: $Id: SassMixinNode.php 118 2010-09-21 09:45:11Z chris.l.yates@gmail.com $ */ /**

* SassMixinNode class file.
* @author                      Chris Yates <chris.l.yates@gmail.com>
* @copyright   Copyright (c) 2010 PBM Web Development
* @license                     http://phamlp.googlecode.com/files/license.txt
* @package                     PHamlP
* @subpackage  Sass.tree
*/

/**

* SassMixinNode class.
* Represents a Mixin.
* @package                     PHamlP
* @subpackage  Sass.tree
*/

class SassMixinNode extends SassNode {

const NODE_IDENTIFIER = '+';
const MATCH = '/^(\+|@include\s+)([-\w]+)\s*(?:\((.*?)\))?$/i';
const IDENTIFIER = 1;
const NAME = 2;
const ARGS = 3;

/**
 * @var string name of the mixin
 */
private $name;
/**
 * @var array arguments for the mixin
 */
private $args = array();

/**
 * SassMixinDefinitionNode constructor.
 * @param object source token
 * @return SassMixinNode
 */
public function __construct($token) {
        parent::__construct($token);
        preg_match(self::MATCH, $token->source, $matches);
        $this->name = $matches[self::NAME];
  if (isset($matches[self::ARGS])) {
        $this->args = SassScriptFunction::extractArgs($matches[self::ARGS]);
  }
}

/**
 * Parse this node.
 * Set passed arguments and any optional arguments not passed to their
 * defaults, then render the children of the mixin definition.
 * @param SassContext the context in which this node is parsed
 * @return array the parsed node
 */
public function parse($context) {
        $mixin = $context->getMixin($this->name);

        $context = new SassContext($context);
        $argc = count($this->args);
        $count = 0;
        foreach ($mixin->args as $name=>$value) {
                if ($count < $argc) {
                        $context->setVariable($name, $this->evaluate($this->args[$count++], $context));
                }
                elseif (!is_null($value)) {
                        $context->setVariable($name, $this->evaluate($value, $context));
                }
                else {
                        throw new SassMixinNodeException("Mixin::{mname}: Required variable ({vname}) not given.\nMixin defined: {dfile}::{dline}\nMixin used", array('{vname}'=>$name, '{mname}'=>$this->name, '{dfile}'=>$mixin->token->filename, '{dline}'=>$mixin->token->line), $this);
                }
        } // foreach

        $children = array();
        foreach ($mixin->children as $child) {
                $child->parent = $this;
                $children = array_merge($children, $child->parse($context));
        } // foreach

        $context->merge();
        return $children;
}

/**
 * Returns a value indicating if the token represents this type of node.
 * @param object token
 * @return boolean true if the token represents this type of node, false if not
 */
public static function isa($token) {
        return $token->source[0] === self::NODE_IDENTIFIER;
}

}