find something clean (not like YYLSP_NEEDED...).
+* Installation
+
* Documentation
Before releasing, make sure the documentation ("Understanding your
parser") refers to the current `output' format.
* lalr1.cc
-** vector
-Move to using vector, drop stack.hh.
-
** I18n
Catch up with yacc.c.
** GLR
How would Paul like to display the conflicted actions? In particular,
-what when two reductions are possible on a given look-ahead token, but one is
+what when two reductions are possible on a given lookahead token, but one is
part of $default. Should we make the two reductions explicit, or just
keep $default? See the following point.
a sample text exhibiting the (LALR) ambiguity. See the paper from
DeRemer and Penello: they already provide the algorithm.
+** Statically check for potential ambiguities in GLR grammars. See
+<http://www.i3s.unice.fr/~schmitz/papers.html#expamb> for an approach.
+
* Extensions
Or something like this.
-** yysymprint interface
-It should be improved, in particular when using Bison features such as
-locations, and YYPARSE_PARAMS. For the time being, it is almost
-recommended to yyprint to steal internal variables...
-
-** Several %unions
-I think this is a pleasant (but useless currently) feature, but in the
-future, I want a means to %include other bits of grammars, and _then_
-it will be important for the various bits to define their needs in
-%union.
-
-When implementing multiple-%union support, bare the following in mind:
-
-- when --yacc, this must be flagged as an error. Don't make it fatal
- though.
-
-- The #line must now appear *inside* the definition of yystype.
- Something like
-
- {
- #line 12 "foo.y"
- int ival;
- #line 23 "foo.y"
- char *sval;
- }
-
** %if and the like
It should be possible to have %if/%else/%endif. The implementation is
not clear: should it be lexical or syntactic. Vadim Maslow thinks it
* Java, Fortran, etc.
-** Java
-
-There are a couple of proposed outputs:
-
-- BYACC/J
- which is based on Byacc.
- <http://troi.lincom-asg.com/~rjamison/byacc/>
-
-- Bison Java
- which is based on Bison.
- <http://www.goice.co.jp/member/mo/hack-progs/bison-java.html>
-
-Sebastien Serrurier (serrur_s@epita.fr) is working on this: he is
-expected to contact the authors, design the output, and implement it
-into Bison.
-
-
* Coding system independence
Paul notes:
the source code. This should get fixed.
* --graph
-Show reductions. []
+Show reductions.
* Broken options ?
-** %no-parser []
-** %token-table []
-** Skeleton strategy. []
-Must we keep %no-parser?
- %token-table?
-
-* src/print_graph.c
-Find the best graph parameters. []
-
-* doc/bison.texinfo
-** Update
-informations about ERROR_VERBOSE. []
-** Add explanations about
-skeleton muscles. []
-%skeleton. []
-
-* testsuite
-** tests/pure-parser.at []
-New tests.
+** %token-table
+** Skeleton strategy
+Must we keep %token-table?
* BTYacc
See if we can integrate backtracking in Bison. Charles-Henri de
-Boysson <de-boy_c@epita.fr> is working on this, and already has some
-results. Vadim Maslow, the maintainer of BTYacc was contacted, and we
-stay in touch with him. Adjusting the Bison grammar parser will be
-needed to support some extra BTYacc features. This is less urgent.
+Boysson <de-boy_c@epita.fr> has been working on this, but never gave
+the results.
+
+Vadim Maslow, the maintainer of BTYacc was once contacted. Adjusting
+the Bison grammar parser will be needed to support some extra BTYacc
+features. This is less urgent.
** Keeping the conflicted actions
First, analyze the differences between byacc and btyacc (I'm referring
** Adjust the skeletons
Import the skeletons for C and C++.
-** Improve the skeletons
-Have them support yysymprint, yydestruct and so forth.
-
* Precedence
makes it impossible to have modular precedence information. We should
move to partial orders (sounds like series/parallel orders to me).
-This will be possible with a Bison parser for the grammar, as it will
-make it much easier to extend the grammar.
-
** Correlation b/w precedence and associativity
Also, I fail to understand why we have to assign the same
associativity to operators with the same precedence. For instance,
a Bison option where every typed default rule is explicitly written out
(same typed ruled can of course be grouped together).
-Note: Robert Anisko handles this. He knows how to do it.
-
-
-* Warnings
-It would be nice to have warning support. See how Autoconf handles
-them, it is fairly well described there. It would be very nice to
-implement this in such a way that other programs could use
-lib/warnings.[ch].
-
-Don't work on this without first announcing you do, as I already have
-thought about it, and know many of the components that can be used to
-implement it.
-
-
* Pre and post actions.
From: Florian Krohm <florian@edamail.fishkill.ibm.com>
Subject: YYACT_EPILOGUE
I was wondering what you think about adding YYACT_PROLOGUE/EPILOGUE
to bison. If you're interested, I'll work on a patch.
-* Move to Graphviz
-Well, VCG seems really dead. Move to Graphviz instead. Also, equip
-the parser with a means to create the (visual) parse tree.
+* Better graphics
+Equip the parser with a means to create the (visual) parse tree.
-----
-Copyright (C) 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
+Copyright (C) 2001, 2002, 2003, 2004, 2006, 2008 Free Software Foundation,
+Inc.
-This file is part of GNU Bison.
+This file is part of Bison, the GNU Compiler Compiler.
-GNU Bison is free software; you can redistribute it and/or modify
+This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
-the Free Software Foundation; either version 2, or (at your option)
-any later version.
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
-GNU Bison is distributed in the hope that it will be useful,
+This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
-along with Bison; see the file COPYING. If not, write to
-the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
-Boston, MA 02110-1301, USA.
+along with this program. If not, see <http://www.gnu.org/licenses/>.
projects / bison.git / blobdiff