split two single character will be fail, i am mad now

[Peter Cheung]

Hi All

    This:

data : 'db' WS 'Aa'

   Can match

db Aa

    But this can't, why?

data : 'db' WS 'A' 'a'

Why fail after split 'Aa' to 'A' 'a' ?

Thanks

from Peter (mche...@hotmail.com)

[Jim Idle]

As you did not send your lexer rules, it is difficult to say but you probably have another rule that conflicts with this one. 

Remember that you can debug the generated code and find out what the lexer does. 

Jim

---

From: antlr-di...@googlegroups.com <antlr-di...@googlegroups.com> on behalf of Peter Cheung <mche...@gmail.com>
Sent: Thursday, August 24, 2017 5:48:24 AM
To: antlr-discussion
Subject: [antlr-discussion] split two single character will be fail, i am mad now

 

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[Mike Lischke]

> This:
> data : 'db' WS 'Aa'
> Can match
>
> db Aa
>
> But this can't, why?
> data : 'db' WS 'A' 'a'
>
>
> Why fail after split 'Aa' to 'A' 'a' ?

In cases like that where you don't get the expected tokens, print your token list to see if it really gives what you would like to see. Use your CommonTokenStream instance to get the token list (if you do that before parsing call fill() first).

Mike
--
www.soft-gems.net

[Peter Cheung]

Super thanks

Jim Idle於 2017年8月24日星期四 UTC+8下午2時19分37秒寫道：