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d78f0ac9d8
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.
49 lines
1.2 KiB
C
49 lines
1.2 KiB
C
/* Associativity information.
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Copyright (C) 2002, 2005, 2006, 2008 Free Software Foundation, Inc.
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This file is part of Bison, the GNU Compiler Compiler.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include <config.h>
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#include "system.h"
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#include "assoc.h"
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const char *
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assoc_to_string (assoc a)
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{
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switch (a)
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{
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default:
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abort ();
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case undef_assoc:
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return "undefined associativity";
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case right_assoc:
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return "%right";
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case left_assoc:
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return "%left";
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case non_assoc:
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return "%nonassoc";
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case precedence_assoc:
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return "%precedence";
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}
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}
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