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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.
35 lines
1.1 KiB
C
35 lines
1.1 KiB
C
/* Associativity information.
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Copyright (C) 2002, 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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#ifndef ASSOC_H_
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# define ASSOC_H_
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/* Associativity values for tokens and rules. */
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typedef enum
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{
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undef_assoc, /** Not defined. */
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right_assoc, /** %right */
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left_assoc, /** %left */
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non_assoc, /** %nonassoc */
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precedence_assoc /** %precedence */
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} assoc;
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char const *assoc_to_string (assoc a);
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#endif /* !ASSOC_H_ */
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