<?php
/* SVN FILE: $Id$ */
/**
 * SassImportNode 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
 */

/**
 * SassImportNode class.
 * Represents a CSS Import.
 * @package      PHamlP
 * @subpackage  Sass.tree
 */
class SassImportNode extends SassNode
{
  const IDENTIFIER = '@';
  const MATCH = '/^@import\s+(.+)/i';
  const MATCH_CSS = '/^((url)\((.+)\)|.+" \w+|http|.+\.css$)/im';
  const FILES = 1;

  /**
   * @var array files to import
   */
  private $files = array();

  /**
   * SassImportNode.
   * @param object source token
   * @return SassImportNode
   */
  public function __construct($token, $parent)
  {
    parent::__construct($token);
    $this->parent = $parent;
    preg_match(self::MATCH, $token->source, $matches);

    foreach (SassList::_build_list($matches[self::FILES]) as $file) {
      $this->files[] = trim($file, '"\'; ');
    }
  }

  /**
   * Parse this node.
   * If the node is a CSS import return the CSS import rule.
   * Else returns the rendered tree for the file.
   * @param SassContext the context in which this node is parsed
   * @return array the parsed node
   */
  public function parse($context)
  {
    $imported = array();
    foreach ($this->files as $file) {
        if (preg_match(self::MATCH_CSS, $file, $matches)) {
          if (isset($matches[2]) && $matches[2] == 'url') {
            $file = $matches[1];
          } else {
            $file = "url('$file')";
          }

          return array(new SassString("@import $file;"), new SassString("\n"));
        }
        $file = trim($file, '\'"');
        $files = SassFile::get_file($file, $this->parser);
        $tree = array();
        if ($files) {
          if ($this->token->level > 0) {
            $tree = $this->parent;
            while (get_class($tree) != 'SassRuleNode' && get_class($tree) != 'SassRootNode' && isset($tree->parent)) {
              $tree = $tree->parent;
            }
            $tree = clone $tree;
            $tree->children = array();
          } else {
            $tree = new SassRootNode($this->parser);
            $tree->extend_parent = $this->parent;
          }

          foreach ($files as $subfile) {
            if (preg_match(self::MATCH_CSS, $subfile)) {
              $tree->addChild(new SassString("@import url('$subfile');"));
            } else {
              $this->parser->filename = $subfile;
              $subtree = SassFile::get_tree($subfile, $this->parser);
              foreach ($subtree->getChildren() as $child) {
                $tree->addChild($child);
              }
            }
          }
        }
        if (!empty($tree)) {
          # parent may be either SassRootNode (returns an object) or SassRuleNode (returns an array of nodes)
          # so we parse then try get the children.
          $parsed = $tree->parse($context);
          if (!is_array($parsed) && isset($parsed->children)) {
            $parsed = $parsed->children;
          }
          if (is_array($parsed)) {
            $imported = array_merge($imported, $parsed);
          }
        }
    }

    return $imported;
  }
}