[antlr-interest] Re: Fixing grammar rule with trailing optional token

[cintyram <cintyram at yahoo.com>]

did you write the rules as you gave here or did you use : instead of = ?

--- In antlr-interest at yahoogroups.com, "angryal2000
<angryal2000 at y...>" <angryal2000 at y...> wrote:
> I am having difficulty trying to fix the following rule:
> 
> data_type: FLOAT (OPENBRACKET INTEGER CLOSEBRACKET)? ;
> 
> FLOAT="float";
> OPENBRACKET='(';
> CLOSEBRACKET=')';
> INTEGER=('0'..'9')+;
> 
> e.g.
> "float" is accept by the rule data_type
> as is
> "float(23)"
> 
> 
> i know my rule is wrong, i am just not sure how to go about fixing it.
>  any ideas?  thanks.


 

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