Message-ID: <3786BC45.B89C14F5@unb.ca>
From: Endlisnis <s257m AT unb DOT ca>
Organization: Nortel Networks
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Subject: Re: Bison and [f]lexical tie-ins
References: <37863AAA DOT BF85DE25 AT americasm01 DOT nt DOT com> <7m5r26$see$1 AT news DOT luth DOT se>
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Date: Sat, 10 Jul 1999 03:20:30 GMT
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To: djgpp AT delorie DOT com
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Reply-To: djgpp AT delorie DOT com

Martin Str|mberg wrote:

> Campbell, Rolf [SKY:1U32:EXCH] (cp1v45 AT americasm01 DOT nt DOT com) wrote:
> : struct a {int a; int b;};
> : struct b {int a; int b;};
> :
> : int main()
> : {
> :   int a, m(b j), b;
>
> Maybe I'm tired but what is m(b j) above? Is it valid C code? If it is
> what does it mean?
> Anyway in the code there isn't a type called "b". There's a type
> called "struct b", right?

    Well, this is actually C++ code.  In C++, declaring that struct is kinda
like doing this in C:
typedef struct a {int a; int b;} a;

And the m(b j) is a prototype for a function which is called 'm', takes a 'b'
structure as a parameter and the parameter name is 'j'.  It's perfectly valid.

> [Klippa, klapp, kluppit rest of program and bison horror story.]
>
> I think the trick is to delay interpreting the lex/yacc output
> somewhat. Like building an incomplete syntax tree, which you then fill
> in with more information when you have the information that is
> necessary (the easiest is to do this when the whole source file has
> been parsed so you know there won't be any more information).

    But, I'm just trying to parse the code, and the flexical tie-in would help
a lot to get rid of some of my reduce/reduce errors.


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