Re: Bison grammar for .x files

Hans-Peter Diettrich <>
4 Aug 2006 16:39:52 -0400

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Related articles
Bison grammar for .x files (AkiRoss) (2006-08-03)
Re: Bison grammar for .x files (Hans-Peter Diettrich) (2006-08-04)
Re: Bison grammar for .x files (2006-08-04)
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From: Hans-Peter Diettrich <>
Newsgroups: comp.compilers
Date: 4 Aug 2006 16:39:52 -0400
Organization: Compilers Central
References: 06-08-009
Keywords: yacc, parse

AkiRoss wrote:

> i'm trying to use flex+bison to build an interpreter for a file format
> (directx .x files). I hope this group is the right one.

> Quote from specs: "Use of commas and semicolons. This is perhaps the
> most complex syntax issue in the file format, but is very strict:
> Commas are used to separate array members; semicolons terminate every
> data item."

Can arrays be data items?
Can arrays be array members?

> For example, a structure like this:
> struct A { int, int, int[3] } in the .x file will be something like: A
> <name> { 1; 2; 3,4,5;; }
> a nested structure like: struct A {int, int}; struct B {A[3]; } will be
> something like: B {1;2;,3;4;,5;6;;}

I suspect something like this:

Item = SimpleItem ";" | Array ";" .
Array = Item { "," Item } .


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