On Tue, Dec 29, 2009 at 11:17 PM, John Levine <jo...@iecc.com> wrote: >>I just start reading the book "flex & bison Text Processing Tools" by >>John Levine. Please excuse me if I ask some question that are >>available somewhere in the book. When the grammar become huge, it >>would be inconvenient put all BNFs in a single file. I'm wondering how >>a huge grammar is handled in bison? > > Slowly. Bison has no built in provision for handling multiple source > files, but it's easy enough to use something like soelim in your > Makefile to combine several files into one and hand it to bison.
I have never used soelim before. I have been looking for some introductory material on it, but I don't find anything useful. (The man page is too terse and hard for me to figure out how to use it if I know nothing about it). The following document seem contains nothing, either. http://sunsite.ualberta.ca/Documentation/Gnu/groff-1.16/html_chapter/groff_toc.html#TOC126 Would you please provide me with some tutorial on soelim? >>> For some languages, like Fortran, Bison/Flex are not a good at all. > > Scanning Fortran with flex would be a losing battle, but once you have > a scanner, parsing it with bison isn't hard. Here's a scanner and > parser for most of Fortran 77 that I wrote 20 years ago: > > ftp://ftp.iecc.com/pub/file/ftn-grammar.gz > > R's, > John > _______________________________________________ help-bison@gnu.org http://lists.gnu.org/mailman/listinfo/help-bison
