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Discussed starting at <http://lists.gnu.org/archive/html/bison-patches/2006-07/msg00019.html> and <http://lists.gnu.org/archive/html/help-bison/2006-07/msg00013.html>. Make the skeletons consistent in how they pop the end token and invoke its %destructor. * data/glr.c (yyrecoverSyntaxError, yyparse): Don't pop the start state, which has token number 0, since this would invoke the %destructor for the end token. * data/lalr1.cc (yy::parser::parse): Don't check for the final state until after shifting the end token, or else it won't be popped. * data/yacc.c (yyparse): Likewise. * data/glr.c (yyparse): Clear the lookahead after shifting it even when it's the end token. Upon termination, destroy an unshifted lookahead even when it's the end token. * data/lalr1.cc (yy::parser::parse): Likewise. * data/yacc.c (yyparse): Likewise. * src/reader.c (packgram): Don't check rule 0. This suppresses unused value warnings for the end token when the user gives the end token a %destructor. * tests/actions.at (Printers and Destructors): Test all the above.
-*- outline -*- This directory contains Bison skeletons: the general shapes of the different parser kinds, that are specialized for specific grammars by the bison program. Currently, there are only three supported skeletons: - 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. It is still very experimental, and not yet supported. Please, subscribe to bison-patches@gnu.org. - glr.c A Generalized LR C parser based on Bison's LALR(1) tables. 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. ----- Copyright (C) 2002 Free Software Foundation, Inc. This file is part of GNU Bison. GNU Bison 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 2, or (at your option) any later version. GNU Bison 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 Bison; see the file COPYING. If not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.