[antlr-interest] limit the number of characters in a string

[Tim Halloran]

Well, since 32 isn't that big you can use brute force.  Below is an example
that gives you identifiers that are no longer than 32 characters need to
start with a letter and then can have letters, numbers, or underscores.

grammar Example;

ID     :    AL
        ALN? ALN? ALN? ALN? ALN?
        ALN? ALN? ALN? ALN? ALN?
        ALN? ALN? ALN? ALN? ALN?
        ALN? ALN? ALN? ALN? ALN?
        ALN? ALN? ALN? ALN? ALN?
        ALN? ALN? ALN? ALN? ALN?
        ALN?
    ;

AL    : 'a'..'z' | 'A'..'Z';
ALN    : AL | '_' | '0'..'9';

Hope this helps,
Tim

On Tue, Sep 23, 2008 at 11:30 AM, waqas javed <waqasjaved at gmail.com> wrote:

>
> Hi,
>
>   I am writing a parser in antlr. Can you tell me how I can limit the
> number
> of characters in string. Actually I want to limit the max number of
> characters
> for an identifier to 32.
>
>   I am using the comman ('a'..'z')+ but this dont put any restriction on
> the
> max number of characters that can be there in an identifier.
>
> regards,
>
> waqas
>
>
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