相关疑难解决方法(0)

我正在尝试创建一个行首标记：

lexer grammar ScriptLexer;

BOL : {getCharPositionInLine() == 0;}; // Beginning Of Line token

但上面发出错误

The name 'getCharPositionInLine' does not exist in the current context

当它创建此代码时：

private void BOL_action(RuleContext _localctx, int actionIndex) {
    switch (actionIndex) {
    case 0: getCharPositionInLine() == 0; break;
    }
}

当getCharPositionInLine()方法不存在...