_processNode(node, level) {
    var that = this;

    node.forEach(function(n) {
      if (node.syntax === 'sass' && n.is('block')) {
        that._processSassBlock(n, level);
      }

      // Continue only with space nodes inside {...}:
      if (node.syntax !== 'sass' && level !== 0 && n.is('space')) {
        that._processSpaceNode(n, level);
      }

      if (n.is('block') || n.is('atrulers')) level++;

      that._processNode(n, level);
    });
  }
@param {Node} node
@param {Number} level