code: function(opts) {
      var opts = opts || {};
      this._template = !!(opts.hasOwnProperty('template') ? opts.template : this.template);
      this._treeRemoval = !!(opts.hasOwnProperty('treeRemoval') ? opts.treeRemoval : this.treeRemoval);
      this._varsRemoval = !!(opts.hasOwnProperty('varsRemoval') ? opts.varsRemoval : this.varsRemoval);
      this._parseNode(this.ast);
      return this;
    }
docs: Parses the Thematic AST instance.
  All non-themed rules and declarations will be eliminated by default.
  @param {Object} options for parsing:
  - disableTreeRemoval: true to prevent destructive tree pruning.
  - disableVarsRemoval: true to prevent destructive variables removal.
  - template: true for template parsing.
  @returns {SassThematic} self reference.