constructor(e, t, r) {
    this.settings = void 0, this.expansionCount = void 0, this.lexer = void 0, this.macros = void 0, this.stack = void 0, this.mode = void 0, this.settings = t, this.expansionCount = 0, this.feed(e), this.macros = new _6(v6, t.macros), this.mode = r, this.stack = [];
  }
Append an array of tokens to the token stack.