factor the handling of m4 escaping

[bison.git] / NEWS

diff --git a/NEWS b/NEWS
index 7eebe9106f0d1ecd5ac22d084b43f46ff6bddfe5..b62aac6dda225991bda53e77c22d844831d85210 100644 (file)
--- a/NEWS
+++ b/NEWS
@@ -2,15 +2,53 @@ GNU Bison NEWS
 
 * Noteworthy changes in release ?.? (????-??-??) [?]
 
 
 * Noteworthy changes in release ?.? (????-??-??) [?]
 

-** Future changes
+ Bison no longer executes user-specified M4 code when processing a grammar.
+
+** Future Changes
+
+  In addition to the removal of the features announced in Bison 2.6, the
+  next major release will remove the "Temporary hack for adding a semicolon
+  to the user action", as announced in the release 2.5.  Instead of:
+
+    exp: exp "+" exp { $$ = $1 + $3 };
+
+  write:
+
+    exp: exp "+" exp { $$ = $1 + $3; };
+
+** Bug fixes
+
+*** Type names are now properly escaped.
+
+*** glr.cc: set_debug_level and debug_level work as expected.
+
+*** Stray @ or $ in actions
+
+  While Bison used to warn about stray $ or @ in action rules, it did not
+  for other actions such as printers, destructors, or initial actions.  It
+  now does.
+
+** Type names in printers and destructors
+
+  For consistency with rule actions, it is now possible to qualify $$ by a
+  type-name in printers and destructors.  For instance:
+
+    %printer { fprintf (yyo, "(%d, %f)", $<ival>$, $<fval>$); } <*> <>;
+
+  will display two values for each typed and untyped symbol (provided
+  that YYSTYPE supports it).
+
+* Noteworthy changes in release 2.6 (2012-07-19) [stable]
+
+** Future Changes

 
   The next major release of Bison will drop support for the following
   deprecated features.  Please report disagreements to bug-bison@gnu.org.
 
 
   The next major release of Bison will drop support for the following
   deprecated features.  Please report disagreements to bug-bison@gnu.org.
 

-*** K&C parsers
+*** K&R C parsers

 
   Support for generating parsers in K&R C will be removed.  Parsers
 
   Support for generating parsers in K&R C will be removed.  Parsers

-  generated for C supprt ISO C90, and are tested with ISO C99 and ISO C11
+  generated for C support ISO C90, and are tested with ISO C99 and ISO C11

   compilers.
 
 *** Features deprecated since Bison 1.875
   compilers.
 
 *** Features deprecated since Bison 1.875


@@ -32,12 +70,12 @@ GNU Bison NEWS
   because existing versions of ylwrap (e.g., Automake 1.12.1) do not support
   it.
 
   because existing versions of ylwrap (e.g., Automake 1.12.1) do not support
   it.
 

-** Headers
+** Generated Parser Headers

 
 *** Guards (yacc.c, glr.c, glr.cc)
 
   The generated headers are now guarded, as is already the case for C++
 
 *** Guards (yacc.c, glr.c, glr.cc)
 
   The generated headers are now guarded, as is already the case for C++

-  parsers (lalr1.cc).  For intance, with --defines=foo.h:
+  parsers (lalr1.cc).  For instance, with --defines=foo.h:

 
     #ifndef YY_FOO_H
     # define YY_FOO_H
 
     #ifndef YY_FOO_H
     # define YY_FOO_H


@@ -65,6 +103,74 @@ GNU Bison NEWS
   header, are removed, as they prevent the possibility of including several
   generated headers from a single compilation unit.
 
   header, are removed, as they prevent the possibility of including several
   generated headers from a single compilation unit.
 

+*** YYLSP_NEEDED
+
+  For the same reasons, the undocumented and unused macro YYLSP_NEEDED is no
+  longer defined.
+
+** New %define variable: api.prefix
+
+  Now that the generated headers are more complete and properly protected
+  against multiple inclusions, constant names, such as YYSTYPE are a
+  problem.  While yyparse and others are properly renamed by %name-prefix,
+  YYSTYPE, YYDEBUG and others have never been affected by it.  Because it
+  would introduce backward compatibility issues in projects not expecting
+  YYSTYPE to be renamed, instead of changing the behavior of %name-prefix,
+  it is deprecated in favor of a new %define variable: api.prefix.
+
+  The following examples compares both:
+
+    %name-prefix "bar_"               | %define api.prefix "bar_"
+    %token <ival> FOO                   %token <ival> FOO
+    %union { int ival; }                %union { int ival; }
+    %%                                  %%
+    exp: 'a';                           exp: 'a';
+
+  bison generates:
+
+    #ifndef BAR_FOO_H                   #ifndef BAR_FOO_H
+    # define BAR_FOO_H                  # define BAR_FOO_H
+
+    /* Enabling traces.  */             /* Enabling traces.  */
+    # ifndef YYDEBUG                  | # ifndef BAR_DEBUG
+                                      > #  if defined YYDEBUG
+                                      > #   if YYDEBUG
+                                      > #    define BAR_DEBUG 1
+                                      > #   else
+                                      > #    define BAR_DEBUG 0
+                                      > #   endif
+                                      > #  else
+    #  define YYDEBUG 0               | #   define BAR_DEBUG 0
+                                      > #  endif
+    # endif                           | # endif
+
+    # if YYDEBUG                      | # if BAR_DEBUG
+    extern int bar_debug;               extern int bar_debug;
+    # endif                             # endif
+
+    /* Tokens.  */                      /* Tokens.  */
+    # ifndef YYTOKENTYPE              | # ifndef BAR_TOKENTYPE
+    #  define YYTOKENTYPE             | #  define BAR_TOKENTYPE
+       enum yytokentype {             |    enum bar_tokentype {
+         FOO = 258                           FOO = 258
+       };                                  };
+    # endif                             # endif
+
+    #if ! defined YYSTYPE \           | #if ! defined BAR_STYPE \
+     && ! defined YYSTYPE_IS_DECLARED |  && ! defined BAR_STYPE_IS_DECLARED
+    typedef union YYSTYPE             | typedef union BAR_STYPE
+    {                                   {
+     int ival;                           int ival;
+    } YYSTYPE;                        | } BAR_STYPE;
+    # define YYSTYPE_IS_DECLARED 1    | # define BAR_STYPE_IS_DECLARED 1
+    #endif                              #endif
+
+    extern YYSTYPE bar_lval;          | extern BAR_STYPE bar_lval;
+
+    int bar_parse (void);               int bar_parse (void);
+
+    #endif /* !BAR_FOO_H  */            #endif /* !BAR_FOO_H  */
+

 * Noteworthy changes in release 2.5.1 (2012-06-05) [stable]
 
 ** Future changes:
 * Noteworthy changes in release 2.5.1 (2012-06-05) [stable]
 
 ** Future changes:


@@ -1233,7 +1339,7 @@ GNU Bison NEWS
 
   - a single argument only can be added,
   - their types are weak (void *),
 
   - a single argument only can be added,
   - their types are weak (void *),

-  - this context is not passed to anciliary functions such as yyerror,
+  - this context is not passed to ancillary functions such as yyerror,

   - only yacc.c parsers support them.
 
   The new %parse-param/%lex-param directives provide a more precise control.
   - only yacc.c parsers support them.
 
   The new %parse-param/%lex-param directives provide a more precise control.


@@ -1731,9 +1837,11 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
  LocalWords:  struct yystype DJGPP lex param Haible NUM alloca YYSTACK NUL goto
  LocalWords:  YYMAXDEPTH Unescaped UCNs YYLTYPE's yyltype typedefs inline Yaccs
  LocalWords:  Heriyanto Reenable dprec Hilfinger Eggert MYEOF Folle Menezes EOF
  LocalWords:  struct yystype DJGPP lex param Haible NUM alloca YYSTACK NUL goto
  LocalWords:  YYMAXDEPTH Unescaped UCNs YYLTYPE's yyltype typedefs inline Yaccs
  LocalWords:  Heriyanto Reenable dprec Hilfinger Eggert MYEOF Folle Menezes EOF

- LocalWords:  Lackovic define's itemset Groff Gettext malloc NEWS'ed YYDEBUG
+ LocalWords:  Lackovic define's itemset Groff Gettext malloc NEWS'ed YYDEBUG YY

  LocalWords:  namespaces strerror const autoconfiguration Dconst Autoconf's FDL
  LocalWords:  namespaces strerror const autoconfiguration Dconst Autoconf's FDL

- LocalWords:  Automake TMPDIR LESSEQ
+ LocalWords:  Automake TMPDIR LESSEQ ylwrap endif yydebug YYTOKEN YYLSP ival hh
+ LocalWords:  extern YYTOKENTYPE TOKENTYPE yytokentype tokentype STYPE lval pdf
+ LocalWords:  lang yyoutput dvi html ps POSIX lvalp llocp

 
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