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Accept a token number in a %left, %right, or %nonassoc for POSIX

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conformance.  Reported by Tim Josling at
<http://lists.gnu.org/archive/html/bug-bison/2008-01/msg00010.html>.
* NEWS (2.3a+): Mention.
* doc/bison.texinfo (Precedence Decl): Describe how literal strings
and code numbers are treated by precedence declarations.
* src/parse-gram.y (precedence_declaration): Use symbols.prec instead
of symbols.1.
(symbols.prec): New, just like symbols.1 but uses symbol.prec instead
of symbol.
(symbol.prec): New, just like symbol but allows INT.
* src/symtab.c (symbol_user_token_number_set): Remove an aver that no
longer holds.
* tests/regression.at (Token number in precedence declaration): New
test case.
This commit is contained in:
Joel E. Denny
2008-02-17 00:18:36 +00:00
parent 80d2c3adcc
commit ab7f29f8f9
7 changed files with 365 additions and 225 deletions
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17
doc/bison.texinfo
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@@ -34,7 +34,8 @@ This manual is for @acronym{GNU} Bison (version @value{VERSION},
@value{UPDATED}), the @acronym{GNU} parser generator.
Copyright @copyright{} 1988, 1989, 1990, 1991, 1992, 1993, 1995, 1998,
1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007 Free Software Foundation, Inc.
1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 Free Software
Foundation, Inc.
@quotation
Permission is granted to copy, distribute and/or modify this document
@@ -4088,7 +4089,7 @@ once. These are called @dfn{precedence declarations}.
@xref{Precedence, ,Operator Precedence}, for general information on
operator precedence.
The syntax of a precedence declaration is the same as that of
The syntax of a precedence declaration is nearly the same as that of
@code{%token}: either
@example
@@ -4126,6 +4127,18 @@ When two tokens declared in different precedence declarations associate,
the one declared later has the higher precedence and is grouped first.
@end itemize
For backward compatibility, there is a confusing difference between the
argument lists of @code{%token} and precedence declarations.
Only a @code{%token} can associate a literal string with a token type name.
A precedence declaration always interprets a literal string as a reference to a
separate token.
For example:
@example
%left OR "<=" // Does not declare an alias.
%left OR 134 "<=" 135 // Declares 134 for OR and 135 for "<=".
@end example
@node Union Decl
@subsection The Collection of Value Types
@cindex declaring value types