Generalize the display of semantic values and locations in traces.

[bison.git] / NEWS

diff --git a/NEWS b/NEWS
index 272168f2c2403d2432db8ecec5382cf4ed2b630f..de75edb6dd7121692e04ae1543189bbdfb9dbb6f 100644 (file)
--- a/NEWS
+++ b/NEWS
@@ -1,17 +1,53 @@
 Bison News
 ----------
 
 Bison News
 ----------
 

-Changes in the next version (not yet released):
+Changes in version 2.1a:

 
 

-* Bison-generated C parsers now support the translation of diagnostics like
+* GLR, YACC parsers.
+  The %parse-params are available in the %destructor's (and the
+  experimental %printer's) as per the documentation.
+
+* Bison now warns if it finds a stray `$' or `@' in an action.
+
+* %require "VERSION"
+  To specify that the grammar file depends on features implemented in
+  Bison version VERSION or higher.
+
+* lalr1.cc: The token and value types are now class members.
+  The tokens where defined as free form enums and cpp macros.  YYSTYPE
+  was defined as a free form union.  Both are now class members:
+  tokens are enumerations of the `yy::parser::token' struct, and the
+  semantic values have the `yy::parser::semantic_type' type.
+
+  If you do not want or can update to this scheme, the directive
+  `%define "global_tokens_and_yystype" "1"' triggers the global
+  definition of tokens and YYSTYPE.  This change is suitable both
+  for previous releases of Bison, and this one.
+
+  If you wish to update, then make sure older version of Bison will
+  fail using `%require "2.1a"'.
+
+* DJGPP support added.
+
+Changes in version 2.1, 2005-09-16:
+
+* Bison-generated parsers now support the translation of diagnostics like

   "syntax error" into languages other than English.  The default
   language is still English.  For details, please see the new
   "syntax error" into languages other than English.  The default
   language is still English.  For details, please see the new

-  Internationalization section of the Bison manual.  Thanks to Bruno
-  Haible for this new feature.
+  Internationalization section of the Bison manual.  Software
+  distributors should also see the new PACKAGING file.  Thanks to
+  Bruno Haible for this new feature.

 
 

-The following change was also in version 2.0a, 2005-05-22:
+* Wording in the Bison-generated parsers has been changed slightly to
+  simplify translation.  In particular, the message "memory exhausted"
+  has replaced "parser stack overflow", as the old message was not
+  always accurate for modern Bison-generated parsers.

 
 

-* When generating verbose diagnostics, Bison-generated C parsers no longer
+* Destructors are now called when the parser aborts, for all symbols left
+  behind on the stack.  Also, the start symbol is now destroyed after a
+  successful parse.  In both cases, the behavior was formerly inconsistent.
+
+* When generating verbose diagnostics, Bison-generated parsers no longer

   quote the literal strings associated with tokens.  For example, for
   a syntax error associated with '%token NUM "number"' they might
   print 'syntax error, unexpected number' instead of 'syntax error,
   quote the literal strings associated with tokens.  For example, for
   a syntax error associated with '%token NUM "number"' they might
   print 'syntax error, unexpected number' instead of 'syntax error,


@@ -415,6 +451,8 @@ Changes in version 1.31, 2002-01-14:
   alloca is used only when compiled with GCC, to avoid portability
   problems as on AIX.
 
   alloca is used only when compiled with GCC, to avoid portability
   problems as on AIX.
 

+* yyparse now returns 2 if memory is exhausted; formerly it dumped core.
+

 * When the generated parser lacks debugging code, YYDEBUG is now 0
   (as POSIX requires) instead of being undefined.
 
 * When the generated parser lacks debugging code, YYDEBUG is now 0
   (as POSIX requires) instead of being undefined.