[antlr-interest] Re: Another newbie question

[derek_kusiak]

--- "lgcraymer" <lgc at m...> wrote:
(...)
> ANTLR doesn't do labeled subrules; what you need instead
> is something like command
> { Token f = null; }
>    : INTFUNC i:INTEGER // So far so good
(...)
>      REALFUNC (e:FLOAT { f = e; } | i:INTEGER { f = i} )
>      {
>        cout << "result = "
>             << realfunc(atof(f->getText().c_str()))
>             << endl;
>      }
>    ;
> 
> or have an action for each of the subrule alternatives
> (instead of the single action for both).

Thanks for the tip, Loring.  I modified your idea a bit and
ran with it:

protected
integer returns [int value]
    : i:INTEGER
    {
        value = atoi(i->getText().c_str());
    }
    ;

protected
real returns [float value]
    : i:INTEGER
    {
        value = atof(i->getText().c_str());
    }
    | f:FLOAT
    {
        value = atof(f->getText().c_str());
    }
    ;

realfunc
    { float f; }
    : REALFUNC f=real { realfunc(f); }
    ;

intfunc
    { int i; }
    : INTFUNC i=integer { intfunc(i); }
    ;





 
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