[antlr-interest] Re: Parsing Identifiers

[Pankaj Rao]

Hi Terence,

Yes I did have the '?' rule before the Ident rule, and that was the issue.
Thanks for your suggestion.

--Pankaj


> Hi All,
>
> I have encoutered this special case while writing my parser and I
> am trying to figure out the cleanest way to handle this.
>
> What I am trying to do is be able to parse identifiers having
> characters beyond alphabets and numbers , for example   "?name" or
> "%name"
>
> My lexer rule for parsing identifiers is as follows:
>
> IDENT
>
>   :  ('a'..'z' | 'A'..'Z' | '_' | '$' ) ( ('a'..'z' | 'A'..'Z' |
> '_' | '$' ) | ('0'..'9' ))*
>
>     ;
>  So I thought about modyfing my Identifier rule to look for '?'.
>
> IDENT
>
>   :  ('a'..'z' | 'A'..'Z' | '_' | '$'|'?' ) ( ('a'..'z' | 'A'..'Z'
> | '_' | '$' | '?') | ('0'..'9' ))*
>
>     ;

My guess is that you also have a '?' rule, which is first and hence
has priority :)

Ter
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