docs: function(opts) {
      var tok = this.scan(/^:([\w\-]+)/, 'filter');
      var inInclude = opts && opts.inInclude;
      if (tok) {
        this.tokens.push(tok);
        this.incrementColumn(tok.val.length);
        this.callLexerFunction('attrs');
        if (!inInclude) {
          this.interpolationAllowed = false;
          this.callLexerFunction('pipelessText');
        }
        return true;
      }
    }