mirror of
https://git.savannah.gnu.org/git/bison.git
synced 2026-03-09 12:23:04 +00:00
d2060f0634
* NEWS (2.5): Document. * data/yacc.c (yysyntax_error): In a verbose syntax error message while in a consistent state with a default action (which must be an error action given that yysyntax_error is being invoked), continue to drop the expected token list, but don't drop the unexpected token unless there actually is no lookahead. Moreover, handle that internally instead of returning 1 to tell the caller to do it. With that meaning of 1 gone, renumber return codes more usefully. (yyparse, yypush_parse): Update yysyntax_error usage. Most importantly, set yytoken to YYEMPTY when there's no lookahead. * data/glr.c (yyreportSyntaxError): As in yacc.c, don't drop the unexpected token unless there actually is no lookahead. * data/lalr1.cc (yy::parser::parse): If there's no lookahead, pass yyempty_ not yyla.type to yysyntax_error_. (yy::parser::yysyntax_error_): Again, don't drop the unexpected token unless there actually is no lookahead. * data/lalr1.java (YYParser::parse): If there's no lookahead, set yytoken to yyempty_ before invoking yysyntax_error. (YYParser::yysyntax_error): Again, don't drop the unexpected token unless there actually is no lookahead. * tests/conflicts.at (parse.error=verbose and consistent errors): Extend test group to further reveal how the previous use of the simple "syntax error" message was too general. Test yacc.c, glr.c, lalr1.cc, and lalr1.java. No longer an expected failure. * tests/java.at (AT_JAVA_COMPILE, AT_JAVA_PARSER_CHECK): Move to... * tests/local.at: ... here. (_AT_BISON_OPTION_PUSHDEFS): Push AT_SKEL_JAVA_IF definition. (AT_BISON_OPTION_POPDEFS): Pop it. (AT_FULL_COMPILE): Extend to handle Java.
1128 lines
34 KiB
C++
1128 lines
34 KiB
C++
# C++ skeleton for Bison
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# Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009,
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# 2010 Free Software Foundation, Inc.
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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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#
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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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#
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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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m4_include(b4_pkgdatadir/[c++.m4])
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# b4_integral_parser_table_declare(TABLE-NAME, CONTENT, COMMENT)
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# --------------------------------------------------------------
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# Declare "parser::yy<TABLE-NAME>_" which contents is CONTENT.
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m4_define([b4_integral_parser_table_declare],
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[m4_ifval([$3], [b4_c_comment([$3], [ ])
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])dnl
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static const b4_int_type_for([$2]) yy$1_[[]];dnl
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])
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# b4_integral_parser_table_define(TABLE-NAME, CONTENT, COMMENT)
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# -------------------------------------------------------------
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# Define "parser::yy<TABLE-NAME>_" which contents is CONTENT.
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m4_define([b4_integral_parser_table_define],
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[ const b4_int_type_for([$2])
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b4_parser_class_name::yy$1_[[]] =
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{
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$2
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};dnl
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])
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# b4_symbol_value_template(VAL, [TYPE])
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# -------------------------------------
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# Same as b4_symbol_value, but used in a template method. It makes
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# a difference when using variants.
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m4_copy([b4_symbol_value], [b4_symbol_value_template])
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# b4_lhs_value([TYPE])
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# --------------------
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# Expansion of $<TYPE>$.
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m4_define([b4_lhs_value],
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[b4_symbol_value([yylhs.value], [$1])])
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# b4_lhs_location()
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# -----------------
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# Expansion of @$.
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m4_define([b4_lhs_location],
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[yylhs.location])
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# b4_rhs_data(RULE-LENGTH, NUM)
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# -----------------------------
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# Return the data corresponding to the symbol #NUM, where the current
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# rule has RULE-LENGTH symbols on RHS.
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m4_define([b4_rhs_data],
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[yystack_@{b4_subtract($@)@}])
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# b4_rhs_state(RULE-LENGTH, NUM)
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# ------------------------------
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# The state corresponding to the symbol #NUM, where the current
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# rule has RULE-LENGTH symbols on RHS.
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m4_define([b4_rhs_state],
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[b4_rhs_data([$1], [$2]).state])
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# b4_rhs_value(RULE-LENGTH, NUM, [TYPE])
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# --------------------------------------
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# Expansion of $<TYPE>NUM, where the current rule has RULE-LENGTH
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# symbols on RHS.
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m4_define([b4_rhs_value],
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[b4_symbol_value([b4_rhs_data([$1], [$2]).value], [$3])])
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# b4_rhs_location(RULE-LENGTH, NUM)
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# ---------------------------------
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# Expansion of @NUM, where the current rule has RULE-LENGTH symbols
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# on RHS.
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m4_define([b4_rhs_location],
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[b4_rhs_data([$1], [$2]).location])
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# b4_symbol_action(SYMBOL-NUM, KIND)
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# ----------------------------------
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# Run the action KIND (destructor or printer) for SYMBOL-NUM.
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# Same as in C, but using references instead of pointers.
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m4_define([b4_symbol_action],
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[b4_symbol_if([$1], [has_$2],
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[m4_pushdef([b4_dollar_dollar],
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[b4_symbol_value_template([yysym.value],
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b4_symbol_if([$1], [has_type],
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[b4_symbol([$1], [type])]))])dnl
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m4_pushdef([b4_at_dollar], [yysym.location])dnl
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b4_symbol_case_([$1])
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b4_syncline([b4_symbol([$1], [$2_line])], ["b4_symbol([$1], [$2_file])"])
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b4_symbol([$1], [$2])
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b4_syncline([@oline@], [@ofile@])
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break;
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m4_popdef([b4_at_dollar])dnl
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m4_popdef([b4_dollar_dollar])dnl
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])])
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m4_pushdef([b4_copyright_years],
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[2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010])
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m4_define([b4_parser_class_name],
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[b4_percent_define_get([[parser_class_name]])])
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# The header is mandatory.
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b4_defines_if([],
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[b4_fatal([b4_skeleton[: using %%defines is mandatory]])])
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b4_locations_if([b4_percent_define_ifdef([[location_type]], [],
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[# Backward compatibility.
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m4_define([b4_location_constructors])
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m4_include(b4_pkgdatadir/[location.cc])])])
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m4_include(b4_pkgdatadir/[stack.hh])
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b4_variant_if([m4_include(b4_pkgdatadir/[variant.hh])])
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# We do want M4 expansion after # for CPP macros.
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m4_changecom()
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m4_divert_push(0)dnl
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@output(b4_spec_defines_file@)@
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b4_copyright([Skeleton interface for Bison LALR(1) parsers in C++])
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dnl FIXME: This is wrong, we want computed header guards.
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[
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/* C++ LALR(1) parser skeleton written by Akim Demaille. */
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#ifndef PARSER_HEADER_H
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# define PARSER_HEADER_H
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]b4_percent_code_get([[requires]])[
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]b4_parse_assert_if([#include <cassert>])[
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#include <stdexcept>
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#include <string>
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#include <iostream>
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#include "stack.hh"
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]b4_locations_if([b4_percent_define_ifdef([[location_type]], [],
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[[#include "location.hh"]])])[
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]b4_variant_if([b4_namespace_open
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b4_variant_define
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b4_namespace_close])[
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/* Enabling traces. */
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#ifndef YYDEBUG
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# define YYDEBUG ]b4_parse_trace_if([1], [0])[
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#endif
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/* Enabling verbose error messages. */
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#ifdef YYERROR_VERBOSE
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# undef YYERROR_VERBOSE
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# define YYERROR_VERBOSE 1
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#else
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# define YYERROR_VERBOSE ]b4_error_verbose_if([1], [0])[
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#endif
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/* Enabling the token table. */
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#ifndef YYTOKEN_TABLE
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# define YYTOKEN_TABLE ]b4_token_table[
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#endif
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]b4_namespace_open[
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/// A Bison parser.
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class ]b4_parser_class_name[
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{
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public:
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]b4_public_types_declare[
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/// Build a parser object.
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]b4_parser_class_name[ (]b4_parse_param_decl[);
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virtual ~]b4_parser_class_name[ ();
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/// Parse.
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/// \returns 0 iff parsing succeeded.
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virtual int parse ();
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#if YYDEBUG
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/// The current debugging stream.
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std::ostream& debug_stream () const;
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/// Set the current debugging stream.
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void set_debug_stream (std::ostream &);
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/// Type for debugging levels.
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typedef int debug_level_type;
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/// The current debugging level.
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debug_level_type debug_level () const;
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/// Set the current debugging level.
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void set_debug_level (debug_level_type l);
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#endif
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/// Report a syntax error.]b4_locations_if([
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/// \param loc where the syntax error is found.])[
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/// \param msg a description of the syntax error.
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virtual void error (]b4_locations_if([const location_type& loc, ])[const std::string& msg);
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private:
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/// State numbers.
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typedef int state_type;
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/// Generate an error message.
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/// \param yystate the state where the error occurred.
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/// \param yytoken the lookahead token.
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virtual std::string yysyntax_error_ (state_type yystate, int yytoken);
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/// Compute post-reduction state.
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/// \param yystate the current state
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/// \param yylhs the nonterminal to push on the stack
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state_type yy_lr_goto_state_ (state_type yystate, int yylhs);
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/// Whether the given \c yypact_ value indicates a defaulted state.
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/// \param yyvalue the value to check
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static bool yy_pact_value_is_default_ (int yyvalue);
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/// Whether the given \c yytable_ value indicates a syntax error.
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/// \param yyvalue the value to check
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static bool yy_table_value_is_error_ (int yyvalue);
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/// Internal symbol numbers.
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typedef ]b4_int_type_for([b4_translate])[ token_number_type;
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static const ]b4_int_type(b4_pact_ninf, b4_pact_ninf)[ yypact_ninf_;
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static const ]b4_int_type(b4_table_ninf, b4_table_ninf)[ yytable_ninf_;
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/* Tables. */
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]b4_parser_tables_declare[
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#if YYDEBUG || YYERROR_VERBOSE || YYTOKEN_TABLE
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/// For a symbol, its name in clear.
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static const char* const yytname_[];
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#endif]b4_error_verbose_if([
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/// Convert the symbol name \a n to a form suitable for a diagnostic.
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static std::string yytnamerr_ (const char *n);])[
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#if YYDEBUG
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]b4_integral_parser_table_declare([rline], [b4_rline],
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[YYRLINE[YYN] -- Source line where rule number YYN was defined.])[
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/// Report on the debug stream that the rule \a r is going to be reduced.
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virtual void yy_reduce_print_ (int r);
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/// Print the state stack on the debug stream.
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virtual void yystack_print_ ();
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/* Debugging. */
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int yydebug_;
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std::ostream* yycdebug_;
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#endif
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/// Convert a scanner token number \a t to a symbol number.
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static inline token_number_type yytranslate_ (]b4_lex_symbol_if([token_type], [int])[ t);
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#if YYDEBUG
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/// \brief Display a symbol type, value and location.
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/// \param yyo The output stream.
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/// \param yysym The symbol.
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template <typename Exact>
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void yy_print_ (std::ostream& yyo,
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const symbol_base_type<Exact>& yysym) const;
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#endif
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/// \brief Reclaim the memory associated to a symbol.
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/// \param yymsg Why this token is reclaimed.
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/// If null, print nothing.
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/// \param s The symbol.
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template <typename Exact>
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inline void yy_destroy_ (const char* yymsg,
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symbol_base_type<Exact>& yysym) const;
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private:
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/// Element of the stack: a state and its attributes.
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struct stack_symbol_type : symbol_base_type<stack_symbol_type>
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{
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/// The parent class.
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typedef symbol_base_type<stack_symbol_type> super_type;
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/// Default constructor.
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inline stack_symbol_type ();
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/// Constructor.
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inline stack_symbol_type (]b4_args([state_type s],
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[const semantic_type& v],
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b4_locations_if([const location_type& l]))[);
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/// The state.
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state_type state;
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/// The type (corresponding to \a state).
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inline int type_get_ () const;
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};
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/// Stack type.
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typedef stack<stack_symbol_type> stack_type;
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/// The stack.
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stack_type yystack_;
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/// Push a new state on the stack.
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/// \param m a debug message to display
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/// if null, no trace is output.
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/// \param s the symbol
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/// \warning the contents of \a s.value is stolen.
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inline void yypush_ (const char* m, stack_symbol_type& s);
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/// Push a new look ahead token on the state on the stack.
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/// \param m a debug message to display
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/// if null, no trace is output.
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/// \param s the state
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/// \param sym the symbol (for its value and location).
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/// \warning the contents of \a s.value is stolen.
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inline void yypush_ (const char* m, state_type s, symbol_type& sym);
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/// Pop \a n symbols the three stacks.
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inline void yypop_ (unsigned int n = 1);
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/* Constants. */
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enum
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{
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yyeof_ = 0,
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yylast_ = ]b4_last[, //< Last index in yytable_.
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yynnts_ = ]b4_nterms_number[, //< Number of nonterminal symbols.
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yyempty_ = -2,
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yyfinal_ = ]b4_final_state_number[, //< Termination state number.
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yyterror_ = 1,
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yyerrcode_ = 256,
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yyntokens_ = ]b4_tokens_number[, //< Number of tokens.
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};
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]b4_parse_param_vars[
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};
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]b4_lex_symbol_if([b4_yytranslate_define
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b4_public_types_define])[
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]b4_namespace_close[
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]b4_percent_define_flag_if([[global_tokens_and_yystype]],
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[b4_token_defines(b4_tokens)
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#ifndef YYSTYPE
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/* Redirection for backward compatibility. */
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# define YYSTYPE b4_namespace_ref::b4_parser_class_name::semantic_type
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#endif
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])
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b4_percent_code_get([[provides]])[]dnl
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[#endif /* ! defined PARSER_HEADER_H */]
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@output(b4_parser_file_name@)@
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b4_copyright([Skeleton implementation for Bison LALR(1) parsers in C++])
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b4_percent_code_get([[top]])[]dnl
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m4_if(b4_prefix, [yy], [],
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[
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// Take the name prefix into account.
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#define yylex b4_prefix[]lex])[
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/* First part of user declarations. */
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]b4_user_pre_prologue[
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#include "@basename(]b4_spec_defines_file[@)"
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/* User implementation prologue. */
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]b4_user_post_prologue
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b4_percent_code_get[]dnl
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[#ifndef YY_
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# if defined YYENABLE_NLS && YYENABLE_NLS
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# if ENABLE_NLS
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# include <libintl.h> /* FIXME: INFRINGES ON USER NAME SPACE */
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# define YY_(msgid) dgettext ("bison-runtime", msgid)
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# endif
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# endif
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# ifndef YY_
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# define YY_(msgid) msgid
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# endif
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#endif
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]b4_locations_if([dnl
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[/* YYLLOC_DEFAULT -- Set CURRENT to span from RHS[1] to RHS[N].
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If N is 0, then set CURRENT to the empty location which ends
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the previous symbol: RHS[0] (always defined). */
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#define YYRHSLOC(Rhs, K) ((Rhs)[K].location)
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#ifndef YYLLOC_DEFAULT
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# define YYLLOC_DEFAULT(Current, Rhs, N) \
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do \
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if (N) \
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{ \
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(Current).begin = YYRHSLOC (Rhs, 1).begin; \
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(Current).end = YYRHSLOC (Rhs, N).end; \
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} \
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else \
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{ \
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(Current).begin = (Current).end = YYRHSLOC (Rhs, 0).end; \
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} \
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while (false)
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|
#endif]])[
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|
|
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/* Suppress unused-variable warnings by "using" E. */
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|
#define YYUSE(e) ((void) (e))
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|
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/* Enable debugging if requested. */
|
|
#if YYDEBUG
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|
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/* A pseudo ostream that takes yydebug_ into account. */
|
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# define YYCDEBUG if (yydebug_) (*yycdebug_)
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# define YY_SYMBOL_PRINT(Title, Symbol) \
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|
do { \
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if (yydebug_) \
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{ \
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*yycdebug_ << Title << ' '; \
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yy_print_ (*yycdebug_, Symbol); \
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*yycdebug_ << std::endl; \
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} \
|
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} while (false)
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# define YY_REDUCE_PRINT(Rule) \
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do { \
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if (yydebug_) \
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yy_reduce_print_ (Rule); \
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} while (false)
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|
|
|
# define YY_STACK_PRINT() \
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do { \
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if (yydebug_) \
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yystack_print_ (); \
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} while (false)
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|
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#else /* !YYDEBUG */
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# define YYCDEBUG if (false) std::cerr
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# define YY_SYMBOL_PRINT(Title, Symbol) static_cast<void>(0)
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# define YY_REDUCE_PRINT(Rule) static_cast<void>(0)
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# define YY_STACK_PRINT() static_cast<void>(0)
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#endif /* !YYDEBUG */
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|
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#define yyerrok (yyerrstatus_ = 0)
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|
#define yyclearin (yyempty = true)
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#define YYACCEPT goto yyacceptlab
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#define YYABORT goto yyabortlab
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#define YYERROR goto yyerrorlab
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#define YYRECOVERING() (!!yyerrstatus_)
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|
|
]b4_namespace_open[]b4_error_verbose_if([[
|
|
|
|
/* Return YYSTR after stripping away unnecessary quotes and
|
|
backslashes, so that it's suitable for yyerror. The heuristic is
|
|
that double-quoting is unnecessary unless the string contains an
|
|
apostrophe, a comma, or backslash (other than backslash-backslash).
|
|
YYSTR is taken from yytname. */
|
|
std::string
|
|
]b4_parser_class_name[::yytnamerr_ (const char *yystr)
|
|
{
|
|
if (*yystr == '"')
|
|
{
|
|
std::string yyr = "";
|
|
char const *yyp = yystr;
|
|
|
|
for (;;)
|
|
switch (*++yyp)
|
|
{
|
|
case '\'':
|
|
case ',':
|
|
goto do_not_strip_quotes;
|
|
|
|
case '\\':
|
|
if (*++yyp != '\\')
|
|
goto do_not_strip_quotes;
|
|
/* Fall through. */
|
|
default:
|
|
yyr += *yyp;
|
|
break;
|
|
|
|
case '"':
|
|
return yyr;
|
|
}
|
|
do_not_strip_quotes: ;
|
|
}
|
|
|
|
return yystr;
|
|
}
|
|
]])[
|
|
|
|
/// Build a parser object.
|
|
]b4_parser_class_name::b4_parser_class_name[ (]b4_parse_param_decl[)]m4_ifset([b4_parse_param], [
|
|
:])[
|
|
#if YYDEBUG
|
|
]m4_ifset([b4_parse_param], [ ], [ :])[yydebug_ (false),
|
|
yycdebug_ (&std::cerr)]m4_ifset([b4_parse_param], [,])[
|
|
#endif]b4_parse_param_cons[
|
|
{
|
|
}
|
|
|
|
]b4_parser_class_name::~b4_parser_class_name[ ()
|
|
{
|
|
}
|
|
|
|
|
|
/*---------------.
|
|
| Symbol types. |
|
|
`---------------*/
|
|
|
|
]b4_lex_symbol_if([], [b4_public_types_define])[
|
|
|
|
// stack_symbol_type.
|
|
]b4_parser_class_name[::stack_symbol_type::stack_symbol_type ()
|
|
: super_type ()
|
|
, state ()
|
|
{
|
|
}
|
|
|
|
]b4_parser_class_name[::stack_symbol_type::stack_symbol_type (]b4_args(
|
|
[state_type s],
|
|
[const semantic_type& v],
|
|
b4_locations_if([const location_type& l]))[)
|
|
: super_type (v]b4_locations_if([, l])[)
|
|
, state (s)
|
|
{
|
|
}
|
|
|
|
int
|
|
]b4_parser_class_name[::stack_symbol_type::type_get_ () const
|
|
{
|
|
return yystos_[state];
|
|
}
|
|
|
|
|
|
template <typename Exact>
|
|
void
|
|
]b4_parser_class_name[::yy_destroy_ (const char* yymsg,
|
|
symbol_base_type<Exact>& yysym) const
|
|
{
|
|
int yytype = yysym.type_get ();
|
|
YYUSE (yymsg);
|
|
if (yymsg)
|
|
YY_SYMBOL_PRINT (yymsg, yysym);
|
|
|
|
// User destructor.
|
|
switch (yytype)
|
|
{
|
|
]b4_symbol_foreach([b4_symbol_destructor])dnl
|
|
[ default:
|
|
break;
|
|
}]b4_variant_if([
|
|
|
|
// Type destructor.
|
|
b4_symbol_variant([[yytype]], [[yysym.value]], [[template destroy]])])[
|
|
}
|
|
|
|
#if YYDEBUG
|
|
template <typename Exact>
|
|
void
|
|
]b4_parser_class_name[::yy_print_ (std::ostream& yyo,
|
|
const symbol_base_type<Exact>& yysym) const
|
|
{
|
|
int yytype = yysym.type_get ();
|
|
yyo << (yytype < yyntokens_ ? "token" : "nterm")
|
|
<< ' ' << yytname_[yytype] << " ("]b4_locations_if([
|
|
<< yysym.location << ": "])[;
|
|
switch (yytype)
|
|
{
|
|
]b4_symbol_foreach([b4_symbol_printer])dnl
|
|
[ default:
|
|
break;
|
|
}
|
|
yyo << ')';
|
|
}
|
|
#endif
|
|
|
|
void
|
|
]b4_parser_class_name[::yypush_ (const char* m, state_type s,
|
|
symbol_type& sym)
|
|
{
|
|
if (m)
|
|
YY_SYMBOL_PRINT (m, sym);
|
|
]b4_variant_if(
|
|
[[ yystack_.push (stack_symbol_type (]b4_args(
|
|
[s],
|
|
[semantic_type()],
|
|
b4_locations_if([sym.location]))[));
|
|
]b4_symbol_variant([[yystos_[s]]], [[yystack_[0].value]],
|
|
[build], [sym.value])],
|
|
[[ yystack_.push (stack_symbol_type (]b4_args(
|
|
[s],
|
|
[sym.value],
|
|
b4_locations_if([sym.location]))[));]])[
|
|
}
|
|
|
|
void
|
|
]b4_parser_class_name[::yypush_ (const char* m, stack_symbol_type& s)
|
|
{
|
|
if (m)
|
|
YY_SYMBOL_PRINT (m, s);
|
|
]b4_variant_if(
|
|
[[ yystack_.push (stack_symbol_type (]b4_args(
|
|
[s.state],
|
|
[semantic_type()],
|
|
b4_locations_if([s.location]))[));
|
|
]b4_symbol_variant([[yystos_[s.state]]], [[yystack_[0].value]],
|
|
[build], [s.value])],
|
|
[ yystack_.push (s);])[
|
|
}
|
|
|
|
void
|
|
]b4_parser_class_name[::yypop_ (unsigned int n)
|
|
{
|
|
yystack_.pop (n);
|
|
}
|
|
|
|
#if YYDEBUG
|
|
std::ostream&
|
|
]b4_parser_class_name[::debug_stream () const
|
|
{
|
|
return *yycdebug_;
|
|
}
|
|
|
|
void
|
|
]b4_parser_class_name[::set_debug_stream (std::ostream& o)
|
|
{
|
|
yycdebug_ = &o;
|
|
}
|
|
|
|
|
|
]b4_parser_class_name[::debug_level_type
|
|
]b4_parser_class_name[::debug_level () const
|
|
{
|
|
return yydebug_;
|
|
}
|
|
|
|
void
|
|
]b4_parser_class_name[::set_debug_level (debug_level_type l)
|
|
{
|
|
yydebug_ = l;
|
|
}
|
|
#endif
|
|
|
|
inline ]b4_parser_class_name[::state_type
|
|
]b4_parser_class_name[::yy_lr_goto_state_ (state_type yystate, int yylhs)
|
|
{
|
|
int yyr = yypgoto_[yylhs - yyntokens_] + yystate;
|
|
if (0 <= yyr && yyr <= yylast_ && yycheck_[yyr] == yystate)
|
|
return yytable_[yyr];
|
|
else
|
|
return yydefgoto_[yylhs - yyntokens_];
|
|
}
|
|
|
|
inline bool
|
|
]b4_parser_class_name[::yy_pact_value_is_default_ (int yyvalue)
|
|
{
|
|
return yyvalue == yypact_ninf_;
|
|
}
|
|
|
|
inline bool
|
|
]b4_parser_class_name[::yy_table_value_is_error_ (int yyvalue)
|
|
{
|
|
return yyvalue == yytable_ninf_;
|
|
}
|
|
|
|
int
|
|
]b4_parser_class_name[::parse ()
|
|
{
|
|
/// Whether yyla contains a lookahead.
|
|
bool yyempty = true;
|
|
|
|
/* State. */
|
|
int yyn;
|
|
int yylen = 0;
|
|
|
|
/* Error handling. */
|
|
int yynerrs_ = 0;
|
|
int yyerrstatus_ = 0;
|
|
|
|
/// The lookahead symbol.
|
|
symbol_type yyla;]b4_locations_if([[
|
|
|
|
/// The locations where the error started and ended.
|
|
stack_symbol_type yyerror_range[3];]])[
|
|
|
|
/// $$ and @@$.
|
|
stack_symbol_type yylhs;
|
|
|
|
/// The return value of parse().
|
|
int yyresult;
|
|
|
|
YYCDEBUG << "Starting parse" << std::endl;
|
|
|
|
]m4_ifdef([b4_initial_action], [
|
|
m4_pushdef([b4_at_dollar], [yyla.location])dnl
|
|
m4_pushdef([b4_dollar_dollar], [yyla.value])dnl
|
|
/* User initialization code. */
|
|
b4_user_initial_action
|
|
m4_popdef([b4_dollar_dollar])dnl
|
|
m4_popdef([b4_at_dollar])])dnl
|
|
|
|
[ /* Initialize the stack. The initial state will be set in
|
|
yynewstate, since the latter expects the semantical and the
|
|
location values to have been already stored, initialize these
|
|
stacks with a primary value. */
|
|
yystack_ = stack_type (0);
|
|
yypush_ (0, 0, yyla);
|
|
|
|
// A new symbol was pushed on the stack.
|
|
yynewstate:
|
|
YYCDEBUG << "Entering state " << yystack_[0].state << std::endl;
|
|
|
|
/* Accept? */
|
|
if (yystack_[0].state == yyfinal_)
|
|
goto yyacceptlab;
|
|
|
|
goto yybackup;
|
|
|
|
/* Backup. */
|
|
yybackup:
|
|
|
|
/* Try to take a decision without lookahead. */
|
|
yyn = yypact_[yystack_[0].state];
|
|
if (yy_pact_value_is_default_ (yyn))
|
|
goto yydefault;
|
|
|
|
/* Read a lookahead token. */
|
|
if (yyempty)
|
|
{
|
|
YYCDEBUG << "Reading a token: ";
|
|
]b4_lex_symbol_if(
|
|
[ yyla = b4_c_function_call([yylex], [symbol_type],
|
|
m4_ifdef([b4_lex_param], b4_lex_param));],
|
|
[ yyla.type = yytranslate_ (b4_c_function_call([yylex], [int],
|
|
[[YYSTYPE*], [&yyla.value]][]dnl
|
|
b4_locations_if([, [[location*], [&yyla.location]]])dnl
|
|
m4_ifdef([b4_lex_param], [, ]b4_lex_param)));])[
|
|
yyempty = false;
|
|
}
|
|
YY_SYMBOL_PRINT ("Next token is", yyla);
|
|
|
|
/* If the proper action on seeing token YYLA.TYPE is to reduce or
|
|
to detect an error, take that action. */
|
|
yyn += yyla.type;
|
|
if (yyn < 0 || yylast_ < yyn || yycheck_[yyn] != yyla.type)
|
|
goto yydefault;
|
|
|
|
/* Reduce or error. */
|
|
yyn = yytable_[yyn];
|
|
if (yyn <= 0)
|
|
{
|
|
if (yy_table_value_is_error_ (yyn))
|
|
goto yyerrlab;
|
|
yyn = -yyn;
|
|
goto yyreduce;
|
|
}
|
|
|
|
/* Discard the token being shifted. */
|
|
yyempty = true;
|
|
|
|
/* Count tokens shifted since error; after three, turn off error
|
|
status. */
|
|
if (yyerrstatus_)
|
|
--yyerrstatus_;
|
|
|
|
/* Shift the lookahead token. */
|
|
yypush_ ("Shifting", yyn, yyla);
|
|
goto yynewstate;
|
|
|
|
/*-----------------------------------------------------------.
|
|
| yydefault -- do the default action for the current state. |
|
|
`-----------------------------------------------------------*/
|
|
yydefault:
|
|
yyn = yydefact_[yystack_[0].state];
|
|
if (yyn == 0)
|
|
goto yyerrlab;
|
|
goto yyreduce;
|
|
|
|
/*-----------------------------.
|
|
| yyreduce -- Do a reduction. |
|
|
`-----------------------------*/
|
|
yyreduce:
|
|
yylen = yyr2_[yyn];
|
|
yylhs.state = yy_lr_goto_state_(yystack_[yylen].state, yyr1_[yyn]);]b4_variant_if([
|
|
/* Variants are always initialized to an empty instance of the
|
|
correct type. The default $$=$1 action is NOT applied when using
|
|
variants. */
|
|
b4_symbol_variant([[yyr1_@{yyn@}]], [yylhs.value], [build])],[
|
|
/* If YYLEN is nonzero, implement the default value of the action:
|
|
`$$ = $1'. Otherwise, use the top of the stack.
|
|
|
|
Otherwise, the following line sets YYLHS.VALUE to garbage.
|
|
This behavior is undocumented and Bison
|
|
users should not rely upon it. */
|
|
if (yylen)
|
|
yylhs.value = yystack_@{yylen - 1@}.value;
|
|
else
|
|
yylhs.value = yystack_@{0@}.value;])[
|
|
]b4_locations_if([dnl
|
|
[
|
|
// Compute the default @@$.
|
|
{
|
|
slice<stack_symbol_type, stack_type> slice (yystack_, yylen);
|
|
YYLLOC_DEFAULT (yylhs.location, slice, yylen);
|
|
}]])[
|
|
|
|
// Perform the reduction.
|
|
YY_REDUCE_PRINT (yyn);
|
|
try
|
|
{
|
|
switch (yyn)
|
|
{
|
|
]b4_user_actions[
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
catch (const syntax_error& yyexc)
|
|
{
|
|
error (]b4_args(b4_locations_if([yyexc.location]),
|
|
[[yyexc.what()]])[);
|
|
YYERROR;
|
|
}
|
|
YY_SYMBOL_PRINT ("-> $$ =", yylhs);
|
|
]b4_variant_if([[
|
|
// Destroy the rhs symbols.
|
|
for (int i = 0; i < yylen; ++i)
|
|
// Destroy a variant which value may have been swapped with
|
|
// yylhs.value (for instance if the action was "std::swap($$,
|
|
// $1)"). The value of yylhs.value (hence possibly one of these
|
|
// rhs symbols) depends on the default contruction for this
|
|
// type. In the case of pointers for instance, no
|
|
// initialization is done, so the value is junk. Therefore do
|
|
// not try to report the value of symbols about to be destroyed
|
|
// in the debug trace, it's possibly junk. Hence yymsg = 0.
|
|
// Besides, that keeps exactly the same traces as with the other
|
|
// Bison skeletons.
|
|
yy_destroy_ (0, yystack_[i]);]])[
|
|
|
|
yypop_ (yylen);
|
|
yylen = 0;
|
|
YY_STACK_PRINT ();
|
|
|
|
/* Shift the result of the reduction. */
|
|
yypush_ (0, yylhs);
|
|
goto yynewstate;
|
|
|
|
/*--------------------------------------.
|
|
| yyerrlab -- here on detecting error. |
|
|
`--------------------------------------*/
|
|
yyerrlab:
|
|
/* If not already recovering from an error, report this error. */
|
|
if (!yyerrstatus_)
|
|
{
|
|
++yynerrs_;
|
|
error (]b4_args(b4_locations_if([yyla.location]),
|
|
[[yysyntax_error_ (yystack_[0].state,
|
|
yyempty ? yyempty_ : yyla.type)]])[);
|
|
}
|
|
|
|
]b4_locations_if([[
|
|
yyerror_range[1].location = yyla.location;]])[
|
|
if (yyerrstatus_ == 3)
|
|
{
|
|
/* If just tried and failed to reuse lookahead token after an
|
|
error, discard it. */
|
|
|
|
/* Return failure if at end of input. */
|
|
if (yyla.type == yyeof_)
|
|
YYABORT;
|
|
else if (!yyempty)
|
|
{
|
|
yy_destroy_ ("Error: discarding", yyla);
|
|
yyempty = true;
|
|
}
|
|
}
|
|
|
|
/* Else will try to reuse lookahead token after shifting the error
|
|
token. */
|
|
goto yyerrlab1;
|
|
|
|
|
|
/*---------------------------------------------------.
|
|
| yyerrorlab -- error raised explicitly by YYERROR. |
|
|
`---------------------------------------------------*/
|
|
yyerrorlab:
|
|
|
|
/* Pacify compilers like GCC when the user code never invokes
|
|
YYERROR and the label yyerrorlab therefore never appears in user
|
|
code. */
|
|
if (false)
|
|
goto yyerrorlab;]b4_locations_if([[
|
|
yyerror_range[1].location = yystack_[yylen - 1].location;]])b4_variant_if([[
|
|
/* $$ was initialized before running the user action. */
|
|
yy_destroy_ ("Error: discarding", yylhs);]])[
|
|
/* Do not reclaim the symbols of the rule which action triggered
|
|
this YYERROR. */
|
|
yypop_ (yylen);
|
|
yylen = 0;
|
|
goto yyerrlab1;
|
|
|
|
/*-------------------------------------------------------------.
|
|
| yyerrlab1 -- common code for both syntax error and YYERROR. |
|
|
`-------------------------------------------------------------*/
|
|
yyerrlab1:
|
|
yyerrstatus_ = 3; /* Each real token shifted decrements this. */
|
|
{
|
|
stack_symbol_type error_token;
|
|
for (;;)
|
|
{
|
|
yyn = yypact_[yystack_[0].state];
|
|
if (!yy_pact_value_is_default_ (yyn))
|
|
{
|
|
yyn += yyterror_;
|
|
if (0 <= yyn && yyn <= yylast_ && yycheck_[yyn] == yyterror_)
|
|
{
|
|
yyn = yytable_[yyn];
|
|
if (0 < yyn)
|
|
break;
|
|
}
|
|
}
|
|
|
|
// Pop the current state because it cannot handle the error token.
|
|
if (yystack_.size () == 1)
|
|
YYABORT;
|
|
]b4_locations_if([[
|
|
yyerror_range[1].location = yystack_[0].location;]])[
|
|
yy_destroy_ ("Error: popping", yystack_[0]);
|
|
yypop_ ();
|
|
YY_STACK_PRINT ();
|
|
}
|
|
]b4_locations_if([[
|
|
yyerror_range[2].location = yyla.location;
|
|
YYLLOC_DEFAULT (error_token.location, yyerror_range, 2);]])[
|
|
|
|
/* Shift the error token. */
|
|
error_token.state = yyn;
|
|
yypush_ ("Shifting", error_token);
|
|
}
|
|
goto yynewstate;
|
|
|
|
/* Accept. */
|
|
yyacceptlab:
|
|
yyresult = 0;
|
|
goto yyreturn;
|
|
|
|
/* Abort. */
|
|
yyabortlab:
|
|
yyresult = 1;
|
|
goto yyreturn;
|
|
|
|
yyreturn:
|
|
if (!yyempty)
|
|
yy_destroy_ ("Cleanup: discarding lookahead", yyla);
|
|
|
|
/* Do not reclaim the symbols of the rule which action triggered
|
|
this YYABORT or YYACCEPT. */
|
|
yypop_ (yylen);
|
|
while (yystack_.size () != 1)
|
|
{
|
|
yy_destroy_ ("Cleanup: popping", yystack_[0]);
|
|
yypop_ ();
|
|
}
|
|
|
|
return yyresult;
|
|
}
|
|
|
|
// Generate an error message.
|
|
std::string
|
|
]b4_parser_class_name[::yysyntax_error_ (]dnl
|
|
b4_error_verbose_if([state_type yystate, int yytoken],
|
|
[int, int])[)
|
|
{]b4_error_verbose_if([[
|
|
std::string yyres;
|
|
// Number of reported tokens (one for the "unexpected", one per
|
|
// "expected").
|
|
size_t yycount = 0;
|
|
// Its maximum.
|
|
enum { YYERROR_VERBOSE_ARGS_MAXIMUM = 5 };
|
|
// Arguments of yyformat.
|
|
char const *yyarg[YYERROR_VERBOSE_ARGS_MAXIMUM];
|
|
|
|
/* There are many possibilities here to consider:
|
|
- If this state is a consistent state with a default action, then
|
|
the only way this function was invoked is if the default action
|
|
is an error action. In that case, don't check for expected
|
|
tokens because there are none.
|
|
- The only way there can be no lookahead present (in yytoken) is
|
|
if this state is a consistent state with a default action.
|
|
Thus, detecting the absence of a lookahead is sufficient to
|
|
determine that there is no unexpected or expected token to
|
|
report. In that case, just report a simple "syntax error".
|
|
- Don't assume there isn't a lookahead just because this state is
|
|
a consistent state with a default action. There might have
|
|
been a previous inconsistent state, consistent state with a
|
|
non-default action, or user semantic action that manipulated
|
|
yyla. (However, yyla is currently not documented for users.)
|
|
- Of course, the expected token list depends on states to have
|
|
correct lookahead information, and it depends on the parser not
|
|
to perform extra reductions after fetching a lookahead from the
|
|
scanner and before detecting a syntax error. Thus, state
|
|
merging (from LALR or IELR) and default reductions corrupt the
|
|
expected token list. However, the list is correct for
|
|
canonical LR with one exception: it will still contain any
|
|
token that will not be accepted due to an error action in a
|
|
later state.
|
|
*/
|
|
if (yytoken != yyempty_)
|
|
{
|
|
yyarg[yycount++] = yytname_[yytoken];
|
|
int yyn = yypact_[yystate];
|
|
if (!yy_pact_value_is_default_ (yyn))
|
|
{
|
|
/* Start YYX at -YYN if negative to avoid negative indexes in
|
|
YYCHECK. In other words, skip the first -YYN actions for
|
|
this state because they are default actions. */
|
|
int yyxbegin = yyn < 0 ? -yyn : 0;
|
|
/* Stay within bounds of both yycheck and yytname. */
|
|
int yychecklim = yylast_ - yyn + 1;
|
|
int yyxend = yychecklim < yyntokens_ ? yychecklim : yyntokens_;
|
|
for (int yyx = yyxbegin; yyx < yyxend; ++yyx)
|
|
if (yycheck_[yyx + yyn] == yyx && yyx != yyterror_
|
|
&& !yy_table_value_is_error_ (yytable_[yyx + yyn]))
|
|
{
|
|
if (yycount == YYERROR_VERBOSE_ARGS_MAXIMUM)
|
|
{
|
|
yycount = 1;
|
|
break;
|
|
}
|
|
else
|
|
yyarg[yycount++] = yytname_[yyx];
|
|
}
|
|
}
|
|
}
|
|
|
|
char const* yyformat = 0;
|
|
switch (yycount)
|
|
{
|
|
#define YYCASE_(N, S) \
|
|
case N: \
|
|
yyformat = S; \
|
|
break
|
|
YYCASE_(0, YY_("syntax error"));
|
|
YYCASE_(1, YY_("syntax error, unexpected %s"));
|
|
YYCASE_(2, YY_("syntax error, unexpected %s, expecting %s"));
|
|
YYCASE_(3, YY_("syntax error, unexpected %s, expecting %s or %s"));
|
|
YYCASE_(4, YY_("syntax error, unexpected %s, expecting %s or %s or %s"));
|
|
YYCASE_(5, YY_("syntax error, unexpected %s, expecting %s or %s or %s or %s"));
|
|
#undef YYCASE_
|
|
}
|
|
|
|
// Argument number.
|
|
size_t yyi = 0;
|
|
for (char const* yyp = yyformat; *yyp; ++yyp)
|
|
if (yyp[0] == '%' && yyp[1] == 's' && yyi < yycount)
|
|
{
|
|
yyres += yytnamerr_ (yyarg[yyi++]);
|
|
++yyp;
|
|
}
|
|
else
|
|
yyres += *yyp;
|
|
return yyres;]], [[
|
|
return YY_("syntax error");]])[
|
|
}
|
|
|
|
|
|
const ]b4_int_type(b4_pact_ninf, b4_pact_ninf) b4_parser_class_name::yypact_ninf_ = b4_pact_ninf[;
|
|
|
|
const ]b4_int_type(b4_table_ninf, b4_table_ninf) b4_parser_class_name::yytable_ninf_ = b4_table_ninf[;
|
|
|
|
]b4_parser_tables_define[
|
|
|
|
#if YYDEBUG || YYERROR_VERBOSE || YYTOKEN_TABLE
|
|
/* YYTNAME[SYMBOL-NUM] -- String name of the symbol SYMBOL-NUM.
|
|
First, the terminals, then, starting at \a yyntokens_, nonterminals. */
|
|
const char*
|
|
const ]b4_parser_class_name[::yytname_[] =
|
|
{
|
|
]b4_tname[
|
|
};
|
|
#endif
|
|
|
|
#if YYDEBUG
|
|
]b4_integral_parser_table_define([rline], [b4_rline])[
|
|
|
|
// Print the state stack on the debug stream.
|
|
void
|
|
]b4_parser_class_name[::yystack_print_ ()
|
|
{
|
|
*yycdebug_ << "Stack now";
|
|
for (stack_type::const_iterator
|
|
i = yystack_.begin (),
|
|
i_end = yystack_.end ();
|
|
i != i_end; ++i)
|
|
*yycdebug_ << ' ' << i->state;
|
|
*yycdebug_ << std::endl;
|
|
}
|
|
|
|
// Report on the debug stream that the rule \a yyrule is going to be reduced.
|
|
void
|
|
]b4_parser_class_name[::yy_reduce_print_ (int yyrule)
|
|
{
|
|
unsigned int yylno = yyrline_[yyrule];
|
|
int yynrhs = yyr2_[yyrule];
|
|
/* Print the symbols being reduced, and their result. */
|
|
*yycdebug_ << "Reducing stack by rule " << yyrule - 1
|
|
<< " (line " << yylno << "):" << std::endl;
|
|
/* The symbols being reduced. */
|
|
for (int yyi = 0; yyi < yynrhs; yyi++)
|
|
YY_SYMBOL_PRINT (" $" << yyi + 1 << " =",
|
|
]b4_rhs_data(yynrhs, yyi + 1)[);
|
|
}
|
|
#endif // YYDEBUG
|
|
|
|
]b4_lex_symbol_if([], [b4_yytranslate_define])[
|
|
]b4_namespace_close[
|
|
]b4_epilogue[]dnl
|
|
m4_divert_pop(0)
|
|
m4_popdef([b4_copyright_years])dnl
|