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The problem was that yacc.c didn't always update the yychar translation afterwards. However, other skeletons appear to be fine. glr.c appears to already translate yychar before every use. lalr1.cc does not define yychar and does not document its replacement, yyla, for users. It does provide yyclearin, but that does not manipulate yyla and thus requires no translation update. In lalr1.java, yychar is out of scope during semantic actions. * NEWS (2.5): Document. * data/yacc.c (YYBACKUP): Don't bother translating yychar into yytoken here. (yyparse, yypush_parse): Instead, translate before every use of yytoken, and add comments explaining this approach. * tests/actions.at (Destroying lookahead assigned by semantic action): New test group checking that translation happens before lookahead destructor calls at parser return. Previously, incorrect destructors were called. * tests/conflicts.at (parse.error=verbose and consistent errors): New test group checking that translation happens at syntax error detection before the associated verbose error message and the associated lookahead destructor calls. While the destructor call is fixed by this patch, the verbose error message is currently incorrect due to another bug (see comments in test group), so this is an expected failure for now.
-*- outline -*- This directory contains data needed by Bison. * Skeletons Bison skeletons: the general shapes of the different parser kinds, that are specialized for specific grammars by the bison program. Currently, the supported skeletons are: - yacc.c It used to be named bison.simple: it corresponds to C Yacc compatible LALR(1) parsers. - lalr1.cc Produces a C++ parser class. - lalr1.java Produces a Java parser class. - glr.c A Generalized LR C parser based on Bison's LALR(1) tables. - glr.cc A Generalized LR C++ parser. Actually a C++ wrapper around glr.c. These skeletons are the only ones supported by the Bison team. Because the interface between skeletons and the bison program is not finished, *we are not bound to it*. In particular, Bison is not mature enough for us to consider that ``foreign skeletons'' are supported. * m4sugar This directory contains M4sugar, sort of an extended library for M4, which is used by Bison to instantiate the skeletons. * xslt This directory contains XSLT programs that transform Bison's XML output into various formats. - bison.xsl A library of routines used by the other XSLT programs. - xml2dot.xsl Conversion into GraphViz's dot format. - xml2text.xsl Conversion into text. - xml2xhtml.xsl Conversion into XHTML. ----- Copyright (C) 2002, 2008-2009 Free Software Foundation, Inc. This file is part of GNU Bison. This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see <http://www.gnu.org/licenses/>.