2007-02-07 Paolo Bonzini <bonzini@gnu.org>

[bison.git] / TODO

diff --git a/TODO b/TODO
index a44f64ece477177531dc7e42dd733d5b37d12751..94bd12c8e76fe288fa5320633b1e69af06bd6ad5 100644 (file)
--- a/TODO
+++ b/TODO
@@ -12,6 +12,8 @@ They should not: it is not documented.  But if they need to, let's
 find something clean (not like YYLSP_NEEDED...).
 
 
+* Installation
+
 * Documentation
 Before releasing, make sure the documentation ("Understanding your
 parser") refers to the current `output' format.
@@ -27,7 +29,7 @@ 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.
 
@@ -47,6 +49,9 @@ Provide better assistance for understanding the conflicts by providing
 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
 
@@ -87,32 +92,6 @@ we should be able to have:
 
 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
@@ -168,23 +147,6 @@ Are there any Texinfo standards for bibliography?
 * 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:
 
@@ -203,28 +165,16 @@ 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?
+** %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.
+Find the best graph parameters.
 
 * BTYacc
 See if we can integrate backtracking in Bison.  Charles-Henri de
@@ -257,9 +207,6 @@ It is unfortunate that there is a total order for precedence.  It
 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,
@@ -339,22 +286,22 @@ at the proper place to bison.simple. Ditto for YYACT_PROLOGUE.
 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 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
+Bison 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.
 
-GNU Bison is distributed in the hope that it will be useful,
+Bison 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.