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Add %precedence support.

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Unfortunately it is not possible to reuse the %prec directive.  This
is because to please POSIX, we do not require to end the rules with a
semicolon.  As a result,

foo: bar %prec baz

is ambiguous: either a rule which precedence is that of baz, or a rule,
and then a declaration of the precedence of the token baz.

	* doc/bison.texinfo: Document %precedence.
	(Precedence Only): New.
	* src/assoc.h, src/assoc.c (precedence_assoc): New.
	* src/conflicts.c (resolve_sr_conflict): Support it.
	* src/scan-gram.l, src/parse-gram.y (%precedence): New token.
	Parse it.
	* tests/calc.at: Use %precedence for NEG.
	* tests/conflicts.at (%precedence does not suffice)
	(%precedence suffices): New tests.
This commit is contained in:
Akim Demaille
2008-08-07 23:15:34 +02:00
parent c85be41a07
commit d78f0ac9d8
9 changed files with 195 additions and 40 deletions
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5
src/assoc.c
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@@ -1,5 +1,5 @@
/* Associativity information.
Copyright (C) 2002, 2005, 2006 Free Software Foundation, Inc.
Copyright (C) 2002, 2005, 2006, 2008 Free Software Foundation, Inc.
This file is part of Bison, the GNU Compiler Compiler.
@@ -41,5 +41,8 @@ assoc_to_string (assoc a)
case non_assoc:
return "%nonassoc";
case precedence_assoc:
return "%precedence";
}
}