TODO: statistics.

[bison.git] / TODO

diff --git a/TODO b/TODO
index b12a039a3bc9eec33f49861fc7a209ca507bad4a..216c97f4f84958ecc858ec691643720df010b76a 100644 (file)
--- a/TODO
+++ b/TODO
@@ -15,8 +15,6 @@ I have seen messages like the following from GCC.
 <built-in>:0: fatal error: opening dependency file .deps/libltdl/argz.Tpo: No such file or directory
 
 
-** Document %define assert
-
 ** Discuss about %printer/%destroy in the case of C++.
 It would be very nice to provide the symbol classes with an operator<<
 and a destructor.  Unfortunately the syntax we have chosen for
@@ -56,6 +54,22 @@ number for the error token, which POSIX wants to be 256, but which
 Bison might renumber if the user used number 256.  Keep fix and doc?
 Throw away?
 
+Also, why don't we output the token name of the error token in the
+output?  It is explicitly skipped:
+
+      /* Skip error token and tokens without identifier.  */
+      if (sym != errtoken && id)
+
+Of course there are issues with name spaces, but if we disable we have
+something which seems to be more simpler and more consistent instead
+of the special case YYERRCODE.
+
+   enum yytokentype {
+     error = 256,
+     // ...
+   };
+
+
 We could (should?) also treat the case of the undef_token, which is
 numbered 257 for yylex, and 2 internal.  Both appear for instance in
 toknum:
@@ -156,10 +170,6 @@ other improvements and also made it faster (probably because memory
 management is performed once instead of three times).  I suggest that
 we do the same in yacc.c.
 
-** yysyntax_error
-In lalr1.cc we invoke it with the translated lookahead (yytoken), and
-yacc.c uses yychar.  I don't see why.
-
 ** yysyntax_error
 The code bw glr.c and yacc.c is really alike, we can certainly factor
 some parts.
@@ -184,6 +194,13 @@ parser") refers to the current `output' format.
 
 * Report
 
+** Figures
+Some statistics about the grammar and the parser would be useful,
+especially when asking the user to send some information about the
+grammars she is working on.  We should probably also include some
+information about the variables (I'm not sure for instance we even
+specify what LR variant was used).
+
 **  GLR
 How would Paul like to display the conflicted actions?  In particular,
 what when two reductions are possible on a given lookahead token, but one is
@@ -296,7 +313,8 @@ this issue.  Does anybody have it?
 Some history of Bison and some bibliography would be most welcome.
 Are there any Texinfo standards for bibliography?
 
-
+** %printer
+Wow, %printer is not documented.  Clearly mark YYPRINT as obsolete.
 
 * Java, Fortran, etc.
 
@@ -417,8 +435,8 @@ Equip the parser with a means to create the (visual) parse tree.
 
 -----
 
-Copyright (C) 2001, 2002, 2003, 2004, 2006, 2008 Free Software Foundation,
-Inc.
+Copyright (C) 2001, 2002, 2003, 2004, 2006, 2008-2009 Free Software
+Foundation, Inc.
 
 This file is part of Bison, the GNU Compiler Compiler.