X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/c6abeab182fed54a2068fd75978a97f9c09d9da7..d59beda068aef97834ea84ce4f5cc99b487e4b68:/NEWS

diff --git a/NEWS b/NEWS
index e9a5dae0..92567dd8 100644
--- a/NEWS
+++ b/NEWS
@@ -3,7 +3,22 @@ Bison News
 
 * Changes in version ?.? (????-??-??):
 
-** Java skeleton improvements:
+** Additional yylex/yyparse arguments
+
+  The new directive %param declare additional argument to both yylex
+  and yyparse.  The %lex-param, %parse-param, and %param directive
+  support one or more arguments.  Instead of
+
+      %lex-param   {arg1_type *arg1}
+      %lex-param   {arg2_type *arg2}
+      %parse-param {arg1_type *arg1}
+      %parse-param {arg2_type *arg2}
+
+  one may now declare
+
+      %param {arg1_type *arg1} {arg2_type *arg2}
+
+** Java skeleton improvements
 
   The constants for token names were moved to the Lexer interface.
   Also, it is possible to add code to the parser's constructors using
@@ -38,6 +53,31 @@ Bison News
 
 * Changes in version 2.5 (????-??-??):
 
+** Named References Support
+
+  Historically, Yacc and Bison have supported positional references
+  ($n, $$) to allow access to symbol values from inside of semantic
+  actions code.
+
+  Starting from this version, Bison can also accept named references.
+  When no ambiguity is possible, original symbol names may be used
+  as named references:
+
+    if_stmt : 'if' cond_expr 'then' then_stmt ';'
+    { $if_stmt = mk_if_stmt($cond_expr, $then_stmt); }
+
+  In the more common case, explicit names may be declared:
+
+    stmt[res] : 'if' expr[cond] 'then' stmt[then] 'else' stmt[else] ';'
+    { $res = mk_if_stmt($cond, $then, $else); }
+
+  Location information is also accessible using @name syntax.  When
+  accessing symbol names containing dots or dashes, explicit bracketing
+  ($[sym.1]) must be used.
+
+  These features are experimental in this version.  More user feedback
+  will help to stabilize them.
+
 ** IELR(1) and Canonical LR(1) Support
 
   IELR(1) is a minimal LR(1) parser table generation algorithm.  That
@@ -176,6 +216,10 @@ Bison News
 
 ** Detection of GNU M4 1.4.6 or newer during configure is improved.
 
+** Warnings from gcc's -Wundef option about undefined YYENABLE_NLS,
+   YYLTYPE_IS_TRIVIAL, and __STRICT_ANSI__ in C/C++ parsers are now
+   avoided.
+
 ** %code is now a permanent feature.
 
   A traditional Yacc prologue directive is written in the form: