Re: Fortran

[Hans-Bernhard Broeker]

On Mon, 17 Feb 2003, Mhaxx wrote:

> Could someone tell me if there is a free Fortran grammar to use to develop a
> simple scanner/parser with Flex/Bison or other resources that could help me
> for my project?

AFAIK, there can't be such a thing --- FORTRAN is notorious for being
impossible to parse by a LALR(1) parser, the type YACC and Bison generate.
The problem is that some constructs like

        DO ing=1,10

as opposed to

        DO ING = 1.5

need more than one token look-ahead to be parseable.  

Same goes for scanning --- all thanks to the blasted craziness of FORTRAN
ignoring all blanks, *everywhere*, even in the middle of a reserved word
or identifier, so DOING and D O  I N   G  are the same thing, to F77.

-- 
Hans-Bernhard Broeker (address@hidden)
Even if all the snow were burnt, ashes would remain.