Document that undefined %prec identifier warnings will remain.

[bison.git] / data / lalr1.cc

diff --git a/data/lalr1.cc b/data/lalr1.cc
index 7eddaf90afa17a6f1ab31bbf895dc8f0b130d017..deab86395e879960a974953da3f1bfa382c67fa2 100644 (file)
--- a/data/lalr1.cc
+++ b/data/lalr1.cc
@@ -1,43 +1,79 @@
-m4_divert(-1)
-

 # C++ skeleton for Bison
 
 # C++ skeleton for Bison
 

-# Copyright (C) 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
+# Copyright (C) 2002-2010 Free Software Foundation, Inc.

 
 

-# This program is free software; you can redistribute it and/or modify
+# 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
 # it under the terms of the GNU General Public License as published by

-# the Free Software Foundation; either version 2 of the License, or
+# the Free Software Foundation, either version 3 of the License, or

 # (at your option) any later version.
 # (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.
 # 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
 # You should have received a copy of the GNU General Public License

-# along with this program; if not, write to the Free Software
-# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
-# 02110-1301  USA
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.

 
 

-## ---------------- ##
-## Default values.  ##
-## ---------------- ##
+m4_include(b4_pkgdatadir/[c++.m4])

 
 

-# Default parser class name.
-m4_define_default([b4_parser_class_name], [parser])

 
 

+# b4_integral_parser_table_declare(TABLE-NAME, CONTENT, COMMENT)
+# --------------------------------------------------------------
+# Declare "parser::yy<TABLE-NAME>_" which contents is CONTENT.
+m4_define([b4_integral_parser_table_declare],
+[m4_ifval([$3], [b4_c_comment([$3], [  ])
+])dnl
+  static const b4_int_type_for([$2]) yy$1_[[]];dnl
+])
+
+# b4_integral_parser_table_define(TABLE-NAME, CONTENT, COMMENT)
+# -------------------------------------------------------------
+# Define "parser::yy<TABLE-NAME>_" which contents is CONTENT.
+m4_define([b4_integral_parser_table_define],
+[  const b4_int_type_for([$2])
+  b4_parser_class_name::yy$1_[[]] =
+  {
+  $2
+  };dnl
+])

 
 
 
 

-## ----------------- ##
-## Semantic Values.  ##
-## ----------------- ##
+# b4_symbol_value_template(VAL, [TYPE])
+# -------------------------------------
+# Same as b4_symbol_value, but used in a template method.  It makes
+# a difference when using variants.
+m4_copy([b4_symbol_value], [b4_symbol_value_template])

 
 
 # b4_lhs_value([TYPE])
 # --------------------
 # Expansion of $<TYPE>$.
 m4_define([b4_lhs_value],
 
 
 # b4_lhs_value([TYPE])
 # --------------------
 # Expansion of $<TYPE>$.
 m4_define([b4_lhs_value],

-[(yyval[]m4_ifval([$1], [.$1]))])
+          [b4_symbol_value([yylhs.value], [$1])])
+
+
+# b4_lhs_location()
+# -----------------
+# Expansion of @$.
+m4_define([b4_lhs_location],
+          [yylhs.location])
+
+
+# b4_rhs_data(RULE-LENGTH, NUM)
+# -----------------------------
+# Return the data corresponding to the symbol #NUM, where the current
+# rule has RULE-LENGTH symbols on RHS.
+m4_define([b4_rhs_data],
+          [yystack_@{b4_subtract($@)@}])
+
+
+# b4_rhs_state(RULE-LENGTH, NUM)
+# ------------------------------
+# The state corresponding to the symbol #NUM, where the current
+# rule has RULE-LENGTH symbols on RHS.
+m4_define([b4_rhs_state],
+          [b4_rhs_data([$1], [$2]).state])

 
 
 # b4_rhs_value(RULE-LENGTH, NUM, [TYPE])
 
 
 # b4_rhs_value(RULE-LENGTH, NUM, [TYPE])


@@ -45,16 +81,7 @@ m4_define([b4_lhs_value],
 # Expansion of $<TYPE>NUM, where the current rule has RULE-LENGTH
 # symbols on RHS.
 m4_define([b4_rhs_value],
 # Expansion of $<TYPE>NUM, where the current rule has RULE-LENGTH
 # symbols on RHS.
 m4_define([b4_rhs_value],

-[(yysemantic_stack_@{m4_eval([$1 - $2])@}m4_ifval([$3], [.$3]))])
-
-m4_define_default([b4_location_type], [location])
-m4_define_default([b4_filename_type], [std::string])
-
-# b4_lhs_location()
-# -----------------
-# Expansion of @$.
-m4_define([b4_lhs_location],
-[(yyloc)])
+          [b4_symbol_value([b4_rhs_data([$1], [$2]).value], [$3])])

 
 
 # b4_rhs_location(RULE-LENGTH, NUM)
 
 
 # b4_rhs_location(RULE-LENGTH, NUM)


@@ -62,91 +89,76 @@ m4_define([b4_lhs_location],
 # Expansion of @NUM, where the current rule has RULE-LENGTH symbols
 # on RHS.
 m4_define([b4_rhs_location],
 # Expansion of @NUM, where the current rule has RULE-LENGTH symbols
 # on RHS.
 m4_define([b4_rhs_location],

-[(yylocation_stack_@{m4_eval([$1 - $2])@})])
-
-
-# b4_parse_param_decl
-# -------------------
-# Extra formal arguments of the constructor.
-# Change the parameter names from "foo" into "foo_yyarg", so that
-# there is no collision bw the user chosen attribute name, and the
-# argument name in the constructor.
-m4_define([b4_parse_param_decl],
-[m4_ifset([b4_parse_param],
-          [m4_map_sep([b4_parse_param_decl_1], [, ], [b4_parse_param])])])
-
-m4_define([b4_parse_param_decl_1],
-[$1_yyarg])
-
-
-
-# b4_parse_param_cons
-# -------------------
-# Extra initialisations of the constructor.
-m4_define([b4_parse_param_cons],
-          [m4_ifset([b4_parse_param],
-                   [,
-      b4_cc_constructor_calls(b4_parse_param)])])
-m4_define([b4_cc_constructor_calls],
-         [m4_map_sep([b4_cc_constructor_call], [,
-      ], [$@])])
-m4_define([b4_cc_constructor_call],
-         [$2 ($2_yyarg)])
-
-# b4_parse_param_vars
-# -------------------
-# Extra instance variables.
-m4_define([b4_parse_param_vars],
-          [m4_ifset([b4_parse_param],
-                   [
-    /* User arguments.  */
-b4_cc_var_decls(b4_parse_param)])])
-m4_define([b4_cc_var_decls],
-         [m4_map_sep([b4_cc_var_decl], [
-], [$@])])
-m4_define([b4_cc_var_decl],
-         [    $1;])
+          [b4_rhs_data([$1], [$2]).location])
+
+
+# b4_symbol_action(SYMBOL-NUM, KIND)
+# ----------------------------------
+# Run the action KIND (destructor or printer) for SYMBOL-NUM.
+# Same as in C, but using references instead of pointers.
+m4_define([b4_symbol_action],
+[b4_symbol_if([$1], [has_$2],
+[m4_pushdef([b4_dollar_dollar],
+    [b4_symbol_value_template([yysym.value],
+                              b4_symbol_if([$1], [has_type],
+                                           [b4_symbol([$1], [type])]))])dnl
+m4_pushdef([b4_at_dollar], [yysym.location])dnl
+      b4_symbol_case_([$1])
+b4_syncline([b4_symbol([$1], [$2_line])], ["b4_symbol([$1], [$2_file])"])
+        b4_symbol([$1], [$2])
+b4_syncline([@oline@], [@ofile@])
+        break;

 
 

+m4_popdef([b4_at_dollar])dnl
+m4_popdef([b4_dollar_dollar])dnl
+])])

 
 
 
 

-# We do want M4 expansion after # for CPP macros.
-m4_changecom()
-m4_divert(0)dnl
-m4_if(b4_defines_flag, 0, [],
-[@output @output_header_name@
-b4_copyright([C++ Skeleton parser for LALR(1) parsing with Bison],
-             [2002, 2003, 2004, 2005])[
-/* FIXME: This is wrong, we want computed header guards.
-   I don't know why the macros are missing now. :( */
-#ifndef PARSER_HEADER_H
-# define PARSER_HEADER_H
+m4_pushdef([b4_copyright_years],
+           [2002-2010])

 
 

-#include <string>
-#include <iostream>
+m4_define([b4_parser_class_name],
+          [b4_percent_define_get([[parser_class_name]])])

 
 

-/* Using locations.  */
-#define YYLSP_NEEDED ]b4_locations_flag[
+# The header is mandatory.
+b4_defines_if([],
+              [b4_fatal([b4_skeleton[: using %%defines is mandatory]])])

 
 

-namespace yy
-{
-  class position;
-  class location;
-}
+b4_locations_if(
+[# Backward compatibility.
+m4_define([b4_location_constructors])
+m4_include(b4_pkgdatadir/[location.cc])])
+m4_include(b4_pkgdatadir/[stack.hh])
+b4_variant_if([m4_include(b4_pkgdatadir/[variant.hh])])

 
 

-]b4_token_defines(b4_tokens)[
+# We do want M4 expansion after # for CPP macros.
+m4_changecom()
+m4_divert_push(0)dnl
+@output(b4_spec_defines_file@)@
+b4_copyright([Skeleton interface for Bison LALR(1) parsers in C++])
+dnl FIXME: This is wrong, we want computed header guards.
+[
+/* C++ LALR(1) parser skeleton written by Akim Demaille.  */

 
 

-/* Copy the first part of user declarations.  */
-]b4_pre_prologue[
+#ifndef PARSER_HEADER_H
+# define PARSER_HEADER_H

 
 

-]/* Line __line__ of lalr1.cc.  */
-b4_syncline([@oline@], [@ofile@])[
+]b4_percent_code_get([[requires]])[

 
 

+]b4_parse_assert_if([#include <cassert>])[
+#include <stdexcept>
+#include <string>
+#include <iostream>
+]b4_locations_if([#include "location.hh"])[

 #include "stack.hh"
 #include "stack.hh"

-#include "location.hh"
+
+]b4_namespace_open[
+]b4_variant_if([b4_variant_define])[
+]b4_namespace_close[

 
 /* Enabling traces.  */
 #ifndef YYDEBUG
 
 /* Enabling traces.  */
 #ifndef YYDEBUG

-# define YYDEBUG ]b4_debug[
+# define YYDEBUG ]b4_parse_trace_if([1], [0])[

 #endif
 
 /* Enabling verbose error messages.  */
 #endif
 
 /* Enabling verbose error messages.  */


@@ -154,7 +166,7 @@ b4_syncline([@oline@], [@ofile@])[
 # undef YYERROR_VERBOSE
 # define YYERROR_VERBOSE 1
 #else
 # undef YYERROR_VERBOSE
 # define YYERROR_VERBOSE 1
 #else

-# define YYERROR_VERBOSE ]b4_error_verbose[
+# define YYERROR_VERBOSE ]b4_error_verbose_if([1], [0])[

 #endif
 
 /* Enabling the token table.  */
 #endif
 
 /* Enabling the token table.  */


@@ -162,88 +174,42 @@ b4_syncline([@oline@], [@ofile@])[
 # define YYTOKEN_TABLE ]b4_token_table[
 #endif
 
 # define YYTOKEN_TABLE ]b4_token_table[
 #endif
 

-#if ! defined (YYSTYPE) && ! defined (YYSTYPE_IS_DECLARED)
-]m4_ifdef([b4_stype],
-[b4_syncline([b4_stype_line], [b4_filename])
-union YYSTYPE b4_stype;
-/* Line __line__ of lalr1.cc.  */
-b4_syncline([@oline@], [@ofile@])],
-[typedef int YYSTYPE;])[
-# define yystype YYSTYPE /* obsolescent; will be withdrawn */
-# define YYSTYPE_IS_DECLARED 1
-# define YYSTYPE_IS_TRIVIAL 1
-#endif
-
-/* Copy the second part of user declarations.  */
-]b4_post_prologue[
-
-]/* Line __line__ of lalr1.cc.  */
-b4_syncline([@oline@], [@ofile@])[
-/* YYLLOC_DEFAULT -- Set CURRENT to span from RHS[1] to RHS[N].
+]b4_locations_if([dnl
+[/* YYLLOC_DEFAULT -- Set CURRENT to span from RHS[1] to RHS[N].

    If N is 0, then set CURRENT to the empty location which ends
    the previous symbol: RHS[0] (always defined).  */
 
 #ifndef YYLLOC_DEFAULT
    If N is 0, then set CURRENT to the empty location which ends
    the previous symbol: RHS[0] (always defined).  */
 
 #ifndef YYLLOC_DEFAULT

-# define YYLLOC_DEFAULT(Current, Rhs, N)               \
-do {                                                   \
-  if (N)                                               \
-    {                                                  \
-      (Current).begin = (Rhs)[1].begin;                        \
-      (Current).end   = (Rhs)[N].end;                  \
-    }                                                  \
-  else                                                 \
-    {                                                  \
-      (Current).begin = (Current).end = (Rhs)[0].end;  \
-    }                                                  \
-} while (0)
-#endif
-
-namespace yy
-{
-  class ]b4_parser_class_name[;
-
-  template <typename P>
-  struct traits
-  {
-  };
-
-  template <>
-  struct traits<]b4_parser_class_name[>
-  {
-    typedef ]b4_int_type_for([b4_translate])[ token_number_type;
-    typedef ]b4_int_type_for([b4_rhs])[       rhs_number_type;
-    typedef int state_type;
-    typedef YYSTYPE semantic_type;
-    typedef ]b4_location_type[ location_type;
-  };
-}
+# define YYLLOC_DEFAULT(Current, Rhs, N)                        \
+do {                                                            \
+  if (N)                                                        \
+    {                                                           \
+      (Current).begin = (Rhs)[1].location.begin;                \
+      (Current).end   = (Rhs)[N].location.end;                 \
+    }                                                           \
+  else                                                          \
+    {                                                           \
+      (Current).begin = (Current).end = (Rhs)[0].location.end; \
+    }                                                           \
+} while (false)
+#endif]])[
+
+]b4_namespace_open[

 
 

-namespace yy
-{

   /// A Bison parser.
   class ]b4_parser_class_name[
   {
   /// A Bison parser.
   class ]b4_parser_class_name[
   {

-    /// Symbol semantic values.
-    typedef traits<]b4_parser_class_name[>::semantic_type semantic_type;
-    /// Symbol locations.
-    typedef traits<]b4_parser_class_name[>::location_type location_type;
-

   public:
   public:

+]b4_public_types_declare[

     /// Build a parser object.
     /// Build a parser object.

-    ]b4_parser_class_name[ (]b4_parse_param_decl[) :
-      yydebug_ (false),
-      yycdebug_ (&std::cerr)]b4_parse_param_cons[
-    {
-    }
-
-    virtual ~]b4_parser_class_name[ ()
-    {
-    }
+    ]b4_parser_class_name[ (]b4_parse_param_decl[);
+    virtual ~]b4_parser_class_name[ ();

 
     /// Parse.
     /// \returns  0 iff parsing succeeded.
     virtual int parse ();
 
 
     /// Parse.
     /// \returns  0 iff parsing succeeded.
     virtual int parse ();
 

+#if YYDEBUG

     /// The current debugging stream.
     std::ostream& debug_stream () const;
     /// Set the current debugging stream.
     /// The current debugging stream.
     std::ostream& debug_stream () const;
     /// Set the current debugging stream.


@@ -255,183 +221,180 @@ namespace yy
     debug_level_type debug_level () const;
     /// Set the current debugging level.
     void set_debug_level (debug_level_type l);
     debug_level_type debug_level () const;
     /// Set the current debugging level.
     void set_debug_level (debug_level_type l);

+#endif

 
 

-  private:
-
-    /// Call the scanner.
-    virtual void yylex_ ();
-
-    /// Report a syntax error.
-    /// \param loc    where the syntax error is found.
+    /// Report a syntax error.]b4_locations_if([
+    /// \param loc    where the syntax error is found.])[

     /// \param msg    a description of the syntax error.
     /// \param msg    a description of the syntax error.

-    virtual void error (const location_type& loc, const std::string& msg);
+    virtual void error (]b4_locations_if([const location_type& loc, ])[const std::string& msg);
+
+  private:
+    /// State numbers.
+    typedef int state_type;

 
 

-    /// Generate an error message, and invoke error.
-    virtual void yyreport_syntax_error_ ();
+    /// Generate an error message.
+    /// \param yystate   the state where the error occurred.
+    /// \param yytoken   the lookahead token.
+    virtual std::string yysyntax_error_ (state_type yystate, int yytoken);

 
 

-#if YYDEBUG
-    /// \brief Report a symbol on the debug stream.
-    /// \param yytype       The token type.
-    /// \param yyvaluep     Its semantic value.
-    /// \param yylocationp  Its location.
-    virtual void yysymprint_ (int yytype,
-                             const semantic_type* yyvaluep,
-                             const location_type* yylocationp);
-#endif /* ! YYDEBUG */
+    /// Compute post-reduction state.
+    /// \param yystate   the current state
+    /// \param yylhs     the nonterminal to push on the stack
+    state_type yy_lr_goto_state_ (state_type yystate, int yylhs);

 
 

+    /// Whether the given \c yypact_ value indicates a defaulted state.
+    /// \param yyvalue   the value to check
+    static bool yy_pact_value_is_default_ (int yyvalue);

 
 

-    /// State numbers.
-    typedef traits<]b4_parser_class_name[>::state_type state_type;
-    /// State stack type.
-    typedef stack<state_type>    state_stack_type;
-    /// Semantic value stack type.
-    typedef stack<semantic_type> semantic_stack_type;
-    /// location stack type.
-    typedef stack<location_type> location_stack_type;
-
-    /// The state stack.
-    state_stack_type yystate_stack_;
-    /// The semantic value stack.
-    semantic_stack_type yysemantic_stack_;
-    /// The location stack.
-    location_stack_type yylocation_stack_;
+    /// Whether the given \c yytable_ value indicates a syntax error.
+    /// \param yyvalue   the value to check
+    static bool yy_table_value_is_error_ (int yyvalue);

 
     /// Internal symbol numbers.
 
     /// Internal symbol numbers.

-    typedef traits<]b4_parser_class_name[>::token_number_type token_number_type;
-    /* Tables.  */
-    /// For a state, the index in \a yytable_ of its portion.
-    static const ]b4_int_type_for([b4_pact])[ yypact_[];
+    typedef ]b4_int_type_for([b4_translate])[ token_number_type;

     static const ]b4_int_type(b4_pact_ninf, b4_pact_ninf)[ yypact_ninf_;
     static const ]b4_int_type(b4_pact_ninf, b4_pact_ninf)[ yypact_ninf_;

-
-    /// For a state, default rule to reduce.
-    /// Unless\a  yytable_ specifies something else to do.
-    /// Zero means the default is an error.
-    static const ]b4_int_type_for([b4_defact])[ yydefact_[];
-
-    static const ]b4_int_type_for([b4_pgoto])[ yypgoto_[];
-    static const ]b4_int_type_for([b4_defgoto])[ yydefgoto_[];
-
-    /// What to do in a state.
-    /// \a yytable_[yypact_[s]]: what to do in state \a s.
-    /// - if positive, shift that token.
-    /// - if negative, reduce the rule which number is the opposite.
-    /// - if zero, do what YYDEFACT says.
-    static const ]b4_int_type_for([b4_table])[ yytable_[];

     static const ]b4_int_type(b4_table_ninf, b4_table_ninf)[ yytable_ninf_;
 
     static const ]b4_int_type(b4_table_ninf, b4_table_ninf)[ yytable_ninf_;
 

-    static const ]b4_int_type_for([b4_check])[ yycheck_[];
-
-    /// For a state, its accessing symbol.
-    static const ]b4_int_type_for([b4_stos])[ yystos_[];
-
-    /// For a rule, its LHS.
-    static const ]b4_int_type_for([b4_r1])[ yyr1_[];
-    /// For a rule, its RHS length.
-    static const ]b4_int_type_for([b4_r2])[ yyr2_[];
+    /* Tables.  */
+]b4_parser_tables_declare[

 
 #if YYDEBUG || YYERROR_VERBOSE || YYTOKEN_TABLE
     /// For a symbol, its name in clear.
     static const char* const yytname_[];
 
 #if YYDEBUG || YYERROR_VERBOSE || YYTOKEN_TABLE
     /// For a symbol, its name in clear.
     static const char* const yytname_[];

-#endif
+#endif]b4_error_verbose_if([

 
 

-#if YYERROR_VERBOSE

     /// Convert the symbol name \a n to a form suitable for a diagnostic.
     /// Convert the symbol name \a n to a form suitable for a diagnostic.

-    virtual std::string yytnamerr_ (const char *n);
-#endif
+    static std::string yytnamerr_ (const char *n);])[

 
 #if YYDEBUG
 
 #if YYDEBUG

-    /// A type to store symbol numbers and -1.
-    typedef traits<]b4_parser_class_name[>::rhs_number_type rhs_number_type;
-    /// A `-1'-separated list of the rules' RHS.
-    static const rhs_number_type yyrhs_[];
-    /// For each rule, the index of the first RHS symbol in \a yyrhs_.
-    static const ]b4_int_type_for([b4_prhs])[ yyprhs_[];
-    /// For each rule, its source line number.
-    static const ]b4_int_type_for([b4_rline])[ yyrline_[];
-    /// For each scanner token number, its symbol number.
-    static const ]b4_int_type_for([b4_toknum])[ yytoken_number_[];
+]b4_integral_parser_table_declare([rline], [b4_rline],
+     [YYRLINE[YYN] -- Source line where rule number YYN was defined.])[

     /// Report on the debug stream that the rule \a r is going to be reduced.
     /// Report on the debug stream that the rule \a r is going to be reduced.

-    virtual void yyreduce_print_ (int r);
+    virtual void yy_reduce_print_ (int r);

     /// Print the state stack on the debug stream.
     virtual void yystack_print_ ();
     /// Print the state stack on the debug stream.
     virtual void yystack_print_ ();

+
+    /* Debugging.  */
+    int yydebug_;
+    std::ostream* yycdebug_;

 #endif
 
 #endif
 

-    /// Convert a scanner token number to a symbol number.
-    inline token_number_type yytranslate_ (int token);
+    /// Convert a scanner token number \a t to a symbol number.
+    static inline token_number_type yytranslate_ (]b4_lex_symbol_if([token_type], [int])[ t);
+
+#if YYDEBUG
+    /// \brief Display a symbol type, value and location.
+    /// \param yyo    The output stream.
+    /// \param yysym  The symbol.
+    template <typename Exact>
+    void yy_print_ (std::ostream& yyo,
+                    const symbol_base_type<Exact>& yysym) const;
+#endif

 
     /// \brief Reclaim the memory associated to a symbol.
 
     /// \brief Reclaim the memory associated to a symbol.

-    /// \param yymsg        Why this token is reclaimed.
-    /// \param yytype       The symbol type.
-    /// \param yyvaluep     Its semantic value.
-    /// \param yylocationp  Its location.
-    inline void yydestruct_ (const char* yymsg,
-                             int yytype,
-                             semantic_type* yyvaluep,
-                             location_type* yylocationp);
+    /// \param yymsg     Why this token is reclaimed.
+    ///                  If null, print nothing.
+    /// \param s         The symbol.
+    template <typename Exact>
+    inline void yy_destroy_ (const char* yymsg,
+                             symbol_base_type<Exact>& yysym) const;

 
 

-    /// Pop \a n symbols the three stacks.
-    inline void yypop_ (unsigned int n = 1);
+  private:
+    /// Element of the stack: a state and its attributes.
+    struct stack_symbol_type : symbol_base_type<stack_symbol_type>
+    {
+      /// The parent class.
+      typedef symbol_base_type<stack_symbol_type> super_type;

 
 

-    /* Constants.  */
-    static const int yyeof_;
-    /* LAST_ -- Last index in TABLE_.  */
-    static const int yylast_;
-    static const int yynnts_;
-    static const int yyempty_;
-    static const int yyfinal_;
-    static const int yyterror_;
-    static const int yyerrcode_;
-    static const int yyntokens_;
-    static const unsigned int yyuser_token_number_max_;
-    static const token_number_type yyundef_token_;
+      /// Default constructor.
+      inline stack_symbol_type ();

 
 

-    /* State.  */
-    int yyn_;
-    int yylen_;
-    int yystate_;
+      /// Constructor.
+      inline stack_symbol_type (]b4_args([state_type s],
+                                         [const semantic_type& v],
+                                         b4_locations_if([const location_type& l]))[);

 
 

-    /* Error handling. */
-    int yynerrs_;
-    int yyerrstatus_;
+      /// The state.
+      state_type state;

 
 

-    /* Debugging.  */
-    int yydebug_;
-    std::ostream* yycdebug_;
+      /// The type (corresponding to \a state).
+      inline int type_get_ () const;
+    };

 
 

-    /* Look-ahead and look-ahead in internal form.  */
-    int yylooka_;
-    int yyilooka_;
+    /// Stack type.
+    typedef stack<stack_symbol_type> stack_type;

 
 

-    /// Semantic value of the look-ahead.
-    semantic_type yylval;
-    /// Location of the look-ahead.
-    location_type yylloc;
-    /// The locations where the error started and ended.
-    location yyerror_range_[2];
+    /// The stack.
+    stack_type yystack_;
+
+    /// Push a new state on the stack.
+    /// \param m    a debug message to display
+    ///             if null, no trace is output.
+    /// \param s    the symbol
+    /// \warning the contents of \a s.value is stolen.
+    inline void yypush_ (const char* m, stack_symbol_type& s);
+
+    /// Push a new look ahead token on the state on the stack.
+    /// \param m    a debug message to display
+    ///             if null, no trace is output.
+    /// \param s    the state
+    /// \param sym  the symbol (for its value and location).
+    /// \warning the contents of \a s.value is stolen.
+    inline void yypush_ (const char* m, state_type s, symbol_type& sym);
+
+    /// Pop \a n symbols the three stacks.
+    inline void yypop_ (unsigned int n = 1);
+
+    /* Constants.  */
+    enum
+    {
+      yyeof_ = 0,
+      yylast_ = ]b4_last[,           //< Last index in yytable_.
+      yynnts_ = ]b4_nterms_number[,  //< Number of nonterminal symbols.
+      yyempty_ = -2,
+      yyfinal_ = ]b4_final_state_number[, //< Termination state number.
+      yyterror_ = 1,
+      yyerrcode_ = 256,
+      yyntokens_ = ]b4_tokens_number[,   //< Number of tokens.
+    };

 
 

-    /// $$.
-    semantic_type yyval;
-    /// @@$.
-    location_type yyloc;

 ]b4_parse_param_vars[
   };
 ]b4_parse_param_vars[
   };

-}

 
 

-#endif /* ! defined PARSER_HEADER_H */]
-])dnl
-@output @output_parser_name@
-b4_copyright([C++ Skeleton parser for LALR(1) parsing with Bison],
-             [2002, 2003, 2004, 2005])
-m4_if(b4_prefix[], [yy], [],
+]b4_lex_symbol_if([b4_yytranslate_define
+b4_public_types_define])[
+]b4_namespace_close[
+
+]b4_percent_define_flag_if([[global_tokens_and_yystype]],
+[b4_token_defines(b4_tokens)
+
+#ifndef YYSTYPE
+ /* Redirection for backward compatibility.  */
+# define YYSTYPE b4_namespace_ref::b4_parser_class_name::semantic_type
+#endif
+])
+b4_percent_code_get([[provides]])[]dnl
+
+[#endif /* ! defined PARSER_HEADER_H */]
+@output(b4_parser_file_name@)@
+b4_copyright([Skeleton implementation for Bison LALR(1) parsers in C++])
+b4_percent_code_get([[top]])[]dnl
+m4_if(b4_prefix, [yy], [],

 [
 // Take the name prefix into account.
 [
 // Take the name prefix into account.

-#define yylex   b4_prefix[]lex])
-m4_if(b4_defines_flag, 0, [],
-[
-#include @output_header_name@])[
+#define yylex   b4_prefix[]lex])[

 
 

-#ifndef YY_
-# if YYENABLE_NLS
+/* First part of user declarations.  */
+]b4_user_pre_prologue[
+
+#include "@basename(]b4_spec_defines_file[@)"
+
+/* User implementation prologue.  */
+]b4_user_post_prologue
+b4_percent_code_get[]dnl
+
+[#ifndef YY_
+# if defined YYENABLE_NLS && YYENABLE_NLS

 #  if ENABLE_NLS
 #   include <libintl.h> /* FIXME: INFRINGES ON USER NAME SPACE */
 #   define YY_(msgid) dgettext ("bison-runtime", msgid)
 #  if ENABLE_NLS
 #   include <libintl.h> /* FIXME: INFRINGES ON USER NAME SPACE */
 #   define YY_(msgid) dgettext ("bison-runtime", msgid)


@@ -442,1010 +405,692 @@ m4_if(b4_defines_flag, 0, [],
 # endif
 #endif
 
 # endif
 #endif
 

-/* A pseudo ostream that takes yydebug_ into account. */
-# define YYCDEBUG                                                      \
-  for (bool yydebugcond_ = yydebug_; yydebugcond_; yydebugcond_ = false)       \
-    (*yycdebug_)
+/* Suppress unused-variable warnings by "using" E.  */
+#define YYUSE(e) ((void) (e))

 
 /* Enable debugging if requested.  */
 #if YYDEBUG
 
 
 /* Enable debugging if requested.  */
 #if YYDEBUG
 

-# define YY_SYMBOL_PRINT(Title, Type, Value, Location) \
-do {                                                   \
-  if (yydebug_)                                                \
-    {                                                  \
-      *yycdebug_ << (Title) << ' ';                    \
-      yysymprint_ ((Type), (Value), (Location));       \
-      *yycdebug_ << std::endl;                         \
-    }                                                  \
-} while (0)
+/* A pseudo ostream that takes yydebug_ into account.  */
+# define YYCDEBUG if (yydebug_) (*yycdebug_)
+
+# define YY_SYMBOL_PRINT(Title, Symbol)         \
+  do {                                          \
+    if (yydebug_)                               \
+    {                                           \
+      *yycdebug_ << Title << ' ';               \
+      yy_print_ (*yycdebug_, Symbol);           \
+      *yycdebug_ << std::endl;                  \
+    }                                           \
+  } while (false)

 
 # define YY_REDUCE_PRINT(Rule)         \
 
 # define YY_REDUCE_PRINT(Rule)         \

-do {                                   \
-  if (yydebug_)                                \
-    yyreduce_print_ (Rule);            \
-} while (0)
+  do {                                 \
+    if (yydebug_)                       \
+      yy_reduce_print_ (Rule);         \
+  } while (false)

 
 # define YY_STACK_PRINT()              \
 
 # define YY_STACK_PRINT()              \

-do {                                   \
-  if (yydebug_)                                \
-    yystack_print_ ();                 \
-} while (0)
+  do {                                 \
+    if (yydebug_)                       \
+      yystack_print_ ();                \
+  } while (false)

 
 #else /* !YYDEBUG */
 
 
 #else /* !YYDEBUG */
 

-# define YY_SYMBOL_PRINT(Title, Type, Value, Location)
-# define YY_REDUCE_PRINT(Rule)
-# define YY_STACK_PRINT()
+# define YYCDEBUG if (false) std::cerr
+# define YY_SYMBOL_PRINT(Title, Symbol)  static_cast<void>(0)
+# define YY_REDUCE_PRINT(Rule)           static_cast<void>(0)
+# define YY_STACK_PRINT()                static_cast<void>(0)

 
 #endif /* !YYDEBUG */
 
 
 #endif /* !YYDEBUG */
 

-#define YYACCEPT       goto yyacceptlab
-#define YYABORT                goto yyabortlab
-#define YYERROR                goto yyerrorlab
-
-#if YYERROR_VERBOSE
-
-/* 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
-yy::]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;
-}
-
-#endif
-
-#if YYDEBUG
-/*--------------------------------.
-| Print this symbol on YYOUTPUT.  |
-`--------------------------------*/
-
-void
-yy::]b4_parser_class_name[::yysymprint_ (int yytype,
-                         const semantic_type* yyvaluep, const location_type* yylocationp)
-{
-  /* Pacify ``unused variable'' warnings.  */
-  (void) yyvaluep;
-  (void) yylocationp;
-  /* Backward compatibility, but should be removed eventually. */
-  std::ostream& cdebug_ = *yycdebug_;
-  (void) cdebug_;
-
-  *yycdebug_ << (yytype < yyntokens_ ? "token" : "nterm")
-            << ' ' << yytname_[yytype] << " ("
-             << *yylocationp << ": ";
-  switch (yytype)
-    {
-]m4_map([b4_symbol_actions], m4_defn([b4_symbol_printers]))dnl
-[      default:
-        break;
-    }
-  *yycdebug_ << ')';
-}
-#endif /* ! YYDEBUG */
-
-void
-yy::]b4_parser_class_name[::yydestruct_ (const char* yymsg,
-                         int yytype, semantic_type* yyvaluep, location_type* yylocationp)
-{
-  /* Pacify ``unused variable'' warnings.  */
-  (void) yymsg;
-  (void) yyvaluep;
-  (void) yylocationp;
-
-  YY_SYMBOL_PRINT (yymsg, yytype, yyvaluep, yylocationp);
-
-  switch (yytype)
-    {
-]m4_map([b4_symbol_actions], m4_defn([b4_symbol_destructors]))[
-      default:
-        break;
-    }
-}
-
-void
-yy::]b4_parser_class_name[::yypop_ (unsigned int n)
-{
-  yystate_stack_.pop (n);
-  yysemantic_stack_.pop (n);
-  yylocation_stack_.pop (n);
-}
-
-std::ostream&
-yy::]b4_parser_class_name[::debug_stream () const
-{
-  return *yycdebug_;
-}
-
-void
-yy::]b4_parser_class_name[::set_debug_stream (std::ostream& o)
-{
-  yycdebug_ = &o;
-}
-
-
-yy::]b4_parser_class_name[::debug_level_type
-yy::]b4_parser_class_name[::debug_level () const
-{
-  return yydebug_;
-}
-
-void
-yy::]b4_parser_class_name[::set_debug_level (debug_level_type l)
-{
-  yydebug_ = l;
-}
-
-
-int
-yy::]b4_parser_class_name[::parse ()
-{
-  int yyresult_;
-
-  YYCDEBUG << "Starting parse" << std::endl;
+#define yyerrok         (yyerrstatus_ = 0)
+#define yyclearin       (yyempty = true)

 
 

-  yynerrs_ = 0;
-  yyerrstatus_ = 0;
+#define YYACCEPT        goto yyacceptlab
+#define YYABORT         goto yyabortlab
+#define YYERROR         goto yyerrorlab
+#define YYRECOVERING()  (!!yyerrstatus_)

 
 

-  /* Start.  */
-  yystate_ = 0;
-  yylooka_ = yyempty_;
+]b4_namespace_open[]b4_error_verbose_if([[

 
 

-]m4_ifdef([b4_initial_action], [
-m4_pushdef([b4_at_dollar],     [yylloc])dnl
-m4_pushdef([b4_dollar_dollar], [yylval])dnl
-  /* User initialization code. */
-  b4_initial_action
-m4_popdef([b4_dollar_dollar])dnl
-m4_popdef([b4_at_dollar])dnl
-/* Line __line__ of yacc.c.  */
-b4_syncline([@oline@], [@ofile@])])dnl
-
-[  /* Initialize the stacks.  The initial state will be pushed in
-     yynewstate, since the latter expects the semantical and the
-     location values to have been already stored, initialize these
-     stacks with a primary value.  */
-  yystate_stack_ = state_stack_type (0);
-  yysemantic_stack_ = semantic_stack_type (0);
-  yylocation_stack_ = location_stack_type (0);
-  yysemantic_stack_.push (yylval);
-  yylocation_stack_.push (yylloc);
-
-  /* New state.  */
-yynewstate:
-  yystate_stack_.push (yystate_);
-  YYCDEBUG << "Entering state " << yystate_ << std::endl;
-  goto yybackup;
-
-  /* Backup.  */
-yybackup:
-
-  /* Try to take a decision without look-ahead.  */
-  yyn_ = yypact_[yystate_];
-  if (yyn_ == yypact_ninf_)
-    goto yydefault;
-
-  /* Read a look-ahead token.  */
-  if (yylooka_ == yyempty_)
-    yylex_ ();
-
-  /* Convert token to internal form.  */
-  if (yylooka_ <= yyeof_)
-    {
-      yylooka_ = yyilooka_ = yyeof_;
-      YYCDEBUG << "Now at end of input." << std::endl;
-    }
-  else
-    {
-      yyilooka_ = yytranslate_ (yylooka_);
-      YY_SYMBOL_PRINT ("Next token is", yyilooka_, &yylval, &yylloc);
-    }
+  /* 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;

 
 

-  /* If the proper action on seeing token ILOOKA_ is to reduce or to
-     detect an error, take that action.  */
-  yyn_ += yyilooka_;
-  if (yyn_ < 0 || yylast_ < yyn_ || yycheck_[yyn_] != yyilooka_)
-    goto yydefault;
+        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: ;
+      }

 
 

-  /* Reduce or error.  */
-  yyn_ = yytable_[yyn_];
-  if (yyn_ < 0)
-    {
-      if (yyn_ == yytable_ninf_)
-       goto yyerrlab;
-      else
-       {
-         yyn_ = -yyn_;
-         goto yyreduce;
-       }
-    }
-  else if (yyn_ == 0)
-    goto yyerrlab;
-
-  /* Accept?  */
-  if (yyn_ == yyfinal_)
-    goto yyacceptlab;
-
-  /* Shift the look-ahead token.  */
-  YY_SYMBOL_PRINT ("Shifting", yyilooka_, &yylval, &yylloc);
-
-  /* Discard the token being shifted unless it is eof.  */
-  if (yylooka_ != yyeof_)
-    yylooka_ = yyempty_;
-
-  yysemantic_stack_.push (yylval);
-  yylocation_stack_.push (yylloc);
-
-  /* Count tokens shifted since error; after three, turn off error
-     status.  */
-  if (yyerrstatus_)
-    --yyerrstatus_;
-
-  yystate_ = yyn_;
-  goto yynewstate;
-
-/*-----------------------------------------------------------.
-| yydefault -- do the default action for the current state.  |
-`-----------------------------------------------------------*/
-yydefault:
-  yyn_ = yydefact_[yystate_];
-  if (yyn_ == 0)
-    goto yyerrlab;
-  goto yyreduce;
-
-/*-----------------------------.
-| yyreduce -- Do a reduction.  |
-`-----------------------------*/
-yyreduce:
-  yylen_ = yyr2_[yyn_];
-  /* If LEN_ is nonzero, implement the default value of the action:
-     `$$ = $1'.  Otherwise, use the top of the stack.
-
-     Otherwise, the following line sets YYVAL to garbage.
-     This behavior is undocumented and Bison
-     users should not rely upon it.  */
-  if (yylen_)
-    yyval = yysemantic_stack_[yylen_ - 1];
-  else
-    yyval = yysemantic_stack_[0];
+    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[

   {
   {

-    slice<location_type, location_stack_type> slice (yylocation_stack_, yylen_);
-    YYLLOC_DEFAULT (yyloc, slice, yylen_);

   }
   }

-  YY_REDUCE_PRINT (yyn_);
-  switch (yyn_)
-    {
-      ]b4_actions[
-      default: break;
-    }
-
-]/* Line __line__ of lalr1.cc.  */
-b4_syncline([@oline@], [@ofile@])[
-
-  yypop_ (yylen_);
-
-  YY_STACK_PRINT ();

 
 

-  yysemantic_stack_.push (yyval);
-  yylocation_stack_.push (yyloc);
-
-  /* Shift the result of the reduction.  */
-  yyn_ = yyr1_[yyn_];
-  yystate_ = yypgoto_[yyn_ - yyntokens_] + yystate_stack_[0];
-  if (0 <= yystate_ && yystate_ <= yylast_
-      && yycheck_[yystate_] == yystate_stack_[0])
-    yystate_ = yytable_[yystate_];
-  else
-    yystate_ = yydefgoto_[yyn_ - yyntokens_];
-  goto yynewstate;
-
-/*------------------------------------.
-| yyerrlab -- here on detecting error |
-`------------------------------------*/
-yyerrlab:
-  /* If not already recovering from an error, report this error.  */
-  yyreport_syntax_error_ ();
-
-  yyerror_range_[0] = yylloc;
-  if (yyerrstatus_ == 3)
-    {
-      /* If just tried and failed to reuse look-ahead token after an
-        error, discard it.  */
-
-      if (yylooka_ <= yyeof_)
-        {
-         /* Return failure if at end of input.  */
-         if (yylooka_ == yyeof_)
-           YYABORT;
-        }
-      else
-        {
-          yydestruct_ ("Error: discarding", yyilooka_, &yylval, &yylloc);
-          yylooka_ = yyempty_;
-        }
-    }
-
-  /* Else will try to reuse look-ahead 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;
-
-  yyerror_range_[0] = yylocation_stack_[yylen_ - 1];
-  yypop_ (yylen_);
-  yystate_ = yystate_stack_[0];
-  goto yyerrlab1;
-
-/*-------------------------------------------------------------.
-| yyerrlab1 -- common code for both syntax error and YYERROR.  |
-`-------------------------------------------------------------*/
-yyerrlab1:
-  yyerrstatus_ = 3;    /* Each real token shifted decrements this.  */
-
-  for (;;)
-    {
-      yyn_ = yypact_[yystate_];
-      if (yyn_ != yypact_ninf_)
-       {
-         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 (yystate_stack_.height () == 1)
-       YYABORT;
-
-      yyerror_range_[0] = yylocation_stack_[0];
-      yydestruct_ ("Error: popping",
-                   yystos_[yystate_],
-                   &yysemantic_stack_[0], &yylocation_stack_[0]);
-      yypop_ ();
-      yystate_ = yystate_stack_[0];
-      YY_STACK_PRINT ();
-    }
-
-  if (yyn_ == yyfinal_)
-    goto yyacceptlab;
+  ]b4_parser_class_name::~b4_parser_class_name[ ()
+  {
+  }

 
 

-  yyerror_range_[1] = yylloc;
-  // Using YYLLOC is tempting, but would change the location of
-  // the look-ahead.  YYLOC is available though.
-  YYLLOC_DEFAULT (yyloc, yyerror_range_ - 1, 2);
-  yysemantic_stack_.push (yylval);
-  yylocation_stack_.push (yyloc);

 
 

-  /* Shift the error token. */
-  YY_SYMBOL_PRINT ("Shifting", yystos_[yyn_],
-                  &yysemantic_stack_[0], &yylocation_stack_[0]);
+  /*---------------.
+  | Symbol types.  |
+  `---------------*/

 
 

-  yystate_ = yyn_;
-  goto yynewstate;
+]b4_lex_symbol_if([], [b4_public_types_define])[

 
 

-  /* Accept.  */
-yyacceptlab:
-  yyresult_ = 0;
-  goto yyreturn;
+  // stack_symbol_type.
+  ]b4_parser_class_name[::stack_symbol_type::stack_symbol_type ()
+    : super_type ()
+    , state ()
+  {
+  }

 
 

-  /* Abort.  */
-yyabortlab:
-  yyresult_ = 1;
-  goto yyreturn;
+  ]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)
+  {
+  }

 
 

-yyreturn:
-  if (yylooka_ != yyeof_ && yylooka_ != yyempty_)
-    yydestruct_ ("Error: discarding lookahead", yyilooka_, &yylval, &yylloc);
+  int
+  ]b4_parser_class_name[::stack_symbol_type::type_get_ () const
+  {
+    return yystos_[state];
+  }

 
 

-  while (yystate_stack_.height () != 1)
-    {
-      yydestruct_ ("Error: popping",
-                  yystos_[yystate_stack_[0]],
-                  &yysemantic_stack_[0],
-                  &yylocation_stack_[0]);
-      yypop_ ();
-    }

 
 

-  return yyresult_;
-}
-
-void
-yy::]b4_parser_class_name[::yylex_ ()
-{
-  YYCDEBUG << "Reading a token: ";
-  yylooka_ = ]b4_c_function_call([yylex], [int],
-[[YYSTYPE*], [&yylval]][]dnl
-b4_location_if([, [[location*], [&yylloc]]])dnl
-m4_ifdef([b4_lex_param], [, ]b4_lex_param))[;
-}
-
-// Generate an error message, and invoke error.
-void
-yy::]b4_parser_class_name[::yyreport_syntax_error_ ()
-{
-  /* If not already recovering from an error, report this error.  */
-  if (!yyerrstatus_)
-    {
-      ++yynerrs_;
-      std::string message;
-#if YYERROR_VERBOSE
-      yyn_ = yypact_[yystate_];
-      if (yypact_ninf_ < yyn_ && yyn_ < yylast_)
-       {
-         /* Start YYX at -YYN if negative to avoid negative indexes in
-            YYCHECK.  */
-         int yyxbegin = yyn_ < 0 ? -yyn_ : 0;
-
-         /* Stay within bounds of both yycheck and yytname.  */
-         int yychecklim = yylast_ - yyn_;
-         int yyxend = yychecklim < yyntokens_ ? yychecklim : yyntokens_;
-          int count = 0;
-          for (int x = yyxbegin; x < yyxend; ++x)
-            if (yycheck_[x + yyn_] == x && x != yyterror_)
-              ++count;
-
-         // FIXME: This method of building the message is not compatible
-         // with internationalization.  It should work like yacc.c does it.
-         // That is, first build a string that looks like this:
-         // "syntax error, unexpected %s or %s or %s"
-         // Then, invoke YY_ on this string.
-         // Finally, use the string as a format to output
-         // yytname_[yyilooka_], etc.
-         // Until this gets fixed, this message appears in English only.
-         message = "syntax error, unexpected ";
-         message += yytnamerr_ (yytname_[yyilooka_]);
-          if (count < 5)
-            {
-              count = 0;
-              for (int x = yyxbegin; x < yyxend; ++x)
-                if (yycheck_[x + yyn_] == x && x != yyterror_)
-                  {
-                    message += (!count++) ? ", expecting " : " or ";
-                   message += yytnamerr_ (yytname_[x]);
-                 }
-            }
-       }
-      else
-#endif
-       message = YY_("syntax error");
-      error (yylloc, message);
-    }
-}
-
-
-/* YYPACT[STATE-NUM] -- Index in YYTABLE of the portion describing
-   STATE-NUM.  */
-const ]b4_int_type(b4_pact_ninf, b4_pact_ninf) yy::b4_parser_class_name::yypact_ninf_ = b4_pact_ninf[;
-const ]b4_int_type_for([b4_pact])[
-yy::]b4_parser_class_name[::yypact_[] =
-{
-  ]b4_pact[
-};
-
-/* YYDEFACT[S] -- default rule to reduce with in state S when YYTABLE
-   doesn't specify something else to do.  Zero means the default is an
-   error.  */
-const ]b4_int_type_for([b4_defact])[
-yy::]b4_parser_class_name[::yydefact_[] =
-{
-  ]b4_defact[
-};
-
-/* YYPGOTO[NTERM-NUM].  */
-const ]b4_int_type_for([b4_pgoto])[
-yy::]b4_parser_class_name[::yypgoto_[] =
-{
-  ]b4_pgoto[
-};
-
-/* YYDEFGOTO[NTERM-NUM].  */
-const ]b4_int_type_for([b4_defgoto])[
-yy::]b4_parser_class_name[::yydefgoto_[] =
-{
-  ]b4_defgoto[
-};
-
-/* YYTABLE[YYPACT[STATE-NUM]].  What to do in state STATE-NUM.  If
-   positive, shift that token.  If negative, reduce the rule which
-   number is the opposite.  If zero, do what YYDEFACT says.  */
-const ]b4_int_type(b4_table_ninf, b4_table_ninf) yy::b4_parser_class_name::yytable_ninf_ = b4_table_ninf[;
-const ]b4_int_type_for([b4_table])[
-yy::]b4_parser_class_name[::yytable_[] =
-{
-  ]b4_table[
-};
-
-/* YYCHECK.  */
-const ]b4_int_type_for([b4_check])[
-yy::]b4_parser_class_name[::yycheck_[] =
-{
-  ]b4_check[
-};
-
-/* STOS_[STATE-NUM] -- The (internal number of the) accessing
-   symbol of state STATE-NUM.  */
-const ]b4_int_type_for([b4_stos])[
-yy::]b4_parser_class_name[::yystos_[] =
-{
-  ]b4_stos[
-};
+  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
 
 #if YYDEBUG

-/* TOKEN_NUMBER_[YYLEX-NUM] -- Internal symbol number corresponding
-   to YYLEX-NUM.  */
-const ]b4_int_type_for([b4_toknum])[
-yy::]b4_parser_class_name[::yytoken_number_[] =
-{
-  ]b4_toknum[
-};
+  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
 
 #endif
 

-/* YYR1[YYN] -- Symbol number of symbol that rule YYN derives.  */
-const ]b4_int_type_for([b4_r1])[
-yy::]b4_parser_class_name[::yyr1_[] =
-{
-  ]b4_r1[
-};
+  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]))[));]])[
+  }

 
 

-/* YYR2[YYN] -- Number of symbols composing right hand side of rule YYN.  */
-const ]b4_int_type_for([b4_r2])[
-yy::]b4_parser_class_name[::yyr2_[] =
-{
-  ]b4_r2[
-};
+  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);])[
+  }

 
 

-#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 yy::]b4_parser_class_name[::yytname_[] =
-{
-  ]b4_tname[
-};
-#endif
+  void
+  ]b4_parser_class_name[::yypop_ (unsigned int n)
+  {
+    yystack_.pop (n);
+  }

 
 #if YYDEBUG
 
 #if YYDEBUG

-/* YYRHS -- A `-1'-separated list of the rules' RHS. */
-const yy::]b4_parser_class_name[::rhs_number_type
-yy::]b4_parser_class_name[::yyrhs_[] =
-{
-  ]b4_rhs[
-};
-
-/* YYPRHS[YYN] -- Index of the first RHS symbol of rule number YYN in
-   YYRHS.  */
-const ]b4_int_type_for([b4_prhs])[
-yy::]b4_parser_class_name[::yyprhs_[] =
-{
-  ]b4_prhs[
-};
-
-/* YYRLINE[YYN] -- Source line where rule number YYN was defined.  */
-const ]b4_int_type_for([b4_rline])[
-yy::]b4_parser_class_name[::yyrline_[] =
-{
-  ]b4_rline[
-};
-
-// Print the state stack on the debug stream.
-void
-yy::]b4_parser_class_name[::yystack_print_ ()
-{
-  *yycdebug_ << "Stack now";
-  for (state_stack_type::const_iterator i = yystate_stack_.begin ();
-       i != yystate_stack_.end (); ++i)
-    *yycdebug_ << ' ' << *i;
-  *yycdebug_ << std::endl;
-}
-
-// Report on the debug stream that the rule \a yyrule is going to be reduced.
-void
-yy::]b4_parser_class_name[::yyreduce_print_ (int yyrule)
-{
-  unsigned int yylno = yyrline_[yyrule];
-  /* Print the symbols being reduced, and their result.  */
-  *yycdebug_ << "Reducing stack by rule " << yyn_ - 1
-             << " (line " << yylno << "), ";
-  for (]b4_int_type_for([b4_prhs])[ i = yyprhs_[yyn_];
-       0 <= yyrhs_[i]; ++i)
-    *yycdebug_ << yytname_[yyrhs_[i]] << ' ';
-  *yycdebug_ << "-> " << yytname_[yyr1_[yyn_]] << std::endl;
-}
-#endif // YYDEBUG
-
-/* YYTRANSLATE(YYLEX) -- Bison symbol number corresponding to YYLEX.  */
-yy::]b4_parser_class_name[::token_number_type
-yy::]b4_parser_class_name[::yytranslate_ (int token)
-{
-  static
-  const token_number_type
-  translate_table[] =
-  {
-    ]b4_translate[
-  };
-  if ((unsigned int) token <= yyuser_token_number_max_)
-    return translate_table[token];
-  else
-    return yyundef_token_;
-}
-
-const int yy::]b4_parser_class_name[::yyeof_ = 0;
-const int yy::]b4_parser_class_name[::yylast_ = ]b4_last[;
-const int yy::]b4_parser_class_name[::yynnts_ = ]b4_nterms_number[;
-const int yy::]b4_parser_class_name[::yyempty_ = -2;
-const int yy::]b4_parser_class_name[::yyfinal_ = ]b4_final_state_number[;
-const int yy::]b4_parser_class_name[::yyterror_ = 1;
-const int yy::]b4_parser_class_name[::yyerrcode_ = 256;
-const int yy::]b4_parser_class_name[::yyntokens_ = ]b4_tokens_number[;
-
-const unsigned int yy::]b4_parser_class_name[::yyuser_token_number_max_ = ]b4_user_token_number_max[;
-const yy::]b4_parser_class_name[::token_number_type yy::]b4_parser_class_name[::yyundef_token_ = ]b4_undef_token_number[;
-
-]b4_epilogue
-dnl
-@output stack.hh
-b4_copyright([stack handling for Bison C++ parsers], [2002, 2003, 2004, 2005])[
-
-#ifndef BISON_STACK_HH
-# define BISON_STACK_HH
-
-#include <deque>
-
-namespace yy
-{
-  template <class T, class S = std::deque<T> >
-  class stack
+  std::ostream&
+  ]b4_parser_class_name[::debug_stream () const

   {
   {

-  public:
-
-    // Hide our reversed order.
-    typedef typename S::reverse_iterator iterator;
-    typedef typename S::const_reverse_iterator const_iterator;
-
-    stack () : seq_ ()
-    {
-    }
-
-    stack (unsigned int n) : seq_ (n)
-    {
-    }
-
-    inline
-    T&
-    operator [] (unsigned int i)
-    {
-      return seq_[i];
-    }
-
-    inline
-    const T&
-    operator [] (unsigned int i) const
-    {
-      return seq_[i];
-    }
-
-    inline
-    void
-    push (const T& t)
-    {
-      seq_.push_front (t);
-    }
-
-    inline
-    void
-    pop (unsigned int n = 1)
-    {
-      for (; n; --n)
-       seq_.pop_front ();
-    }
-
-    inline
-    unsigned int
-    height () const
-    {
-      return seq_.size ();
-    }
-
-    inline const_iterator begin () const { return seq_.rbegin (); }
-    inline const_iterator end () const { return seq_.rend (); }
-
-  private:
-
-    S seq_;
-  };
+    return *yycdebug_;
+  }

 
 

-  /// Present a slice of the top of a stack.
-  template <class T, class S = stack<T> >
-  class slice
+  void
+  ]b4_parser_class_name[::set_debug_stream (std::ostream& o)

   {
   {

-  public:
-
-    slice (const S& stack,
-          unsigned int range) : stack_ (stack),
-                                range_ (range)
-    {
-    }
-
-    inline
-    const T&
-    operator [] (unsigned int i) const
-    {
-      return stack_[range_ - i];
-    }
-
-  private:
-
-    const S& stack_;
-    unsigned int range_;
-  };
-}
-
-#endif // not BISON_STACK_HH]
-dnl
-@output position.hh
-b4_copyright([Position class for Bison C++ parsers], [2002, 2003, 2004, 2005])[
-
-/**
- ** \file position.hh
- ** Define the position class.
- */
-
-#ifndef BISON_POSITION_HH
-# define BISON_POSITION_HH
+    yycdebug_ = &o;
+  }

 
 

-# include <iostream>
-# include <string>

 
 

-namespace yy
-{
-  /// Abstract a position.
-  class position
+  ]b4_parser_class_name[::debug_level_type
+  ]b4_parser_class_name[::debug_level () const

   {
   {

-  public:
-    /// Initial column number.
-    static const unsigned int initial_column = 0;
-    /// Initial line number.
-    static const unsigned int initial_line = 1;
-
-    /** \name Ctor & dtor.
-     ** \{ */
-  public:
-    /// Construct a position.
-    position () :
-      filename (0),
-      line (initial_line),
-      column (initial_column)
-    {
-    }
-    /** \} */
-
-
-    /** \name Line and Column related manipulators
-     ** \{ */
-  public:
-    /// (line related) Advance to the COUNT next lines.
-    inline void lines (int count = 1)
-    {
-      column = initial_column;
-      line += count;
-    }
-
-    /// (column related) Advance to the COUNT next columns.
-    inline void columns (int count = 1)
-    {
-      int leftmost = initial_column;
-      int current  = column;
-      if (leftmost <= current + count)
-       column += count;
-      else
-       column = initial_column;
-    }
-    /** \} */
-
-  public:
-    /// File name to which this position refers.
-    ]b4_filename_type[* filename;
-    /// Current line number.
-    unsigned int line;
-    /// Current column number.
-    unsigned int column;
-  };
+    return yydebug_;
+  }

 
 

-  /// Add and assign a position.
-  inline const position&
-  operator+= (position& res, const int width)
+  void
+  ]b4_parser_class_name[::set_debug_level (debug_level_type l)

   {
   {

-    res.columns (width);
-    return res;
+    yydebug_ = l;

   }
   }

+#endif

 
 

-  /// Add two position objects.
-  inline const position
-  operator+ (const position& begin, const int width)
+  inline ]b4_parser_class_name[::state_type
+  ]b4_parser_class_name[::yy_lr_goto_state_ (state_type yystate, int yylhs)

   {
   {

-    position res = begin;
-    return res += width;
+    int yyr = yypgoto_[yylhs - yyntokens_] + yystate;
+    if (0 <= yyr && yyr <= yylast_ && yycheck_[yyr] == yystate)
+      return yytable_[yyr];
+    else
+      return yydefgoto_[yylhs - yyntokens_];

   }
 
   }
 

-  /// Add and assign a position.
-  inline const position&
-  operator-= (position& res, const int width)
+  inline bool
+  ]b4_parser_class_name[::yy_pact_value_is_default_ (int yyvalue)

   {
   {

-    return res += -width;
+    return yyvalue == yypact_ninf_;

   }
 
   }
 

-  /// Add two position objects.
-  inline const position
-  operator- (const position& begin, const int width)
+  inline bool
+  ]b4_parser_class_name[::yy_table_value_is_error_ (int yyvalue)

   {
   {

-    return begin + -width;
+    return yyvalue == yytable_ninf_;

   }
 
   }
 

-  /** \brief Intercept output stream redirection.
-   ** \param ostr the destination output stream
-   ** \param pos a reference to the position to redirect
-   */
-  inline std::ostream&
-  operator<< (std::ostream& ostr, const position& pos)
+  int
+  ]b4_parser_class_name[::parse ()

   {
   {

-    if (pos.filename)
-      ostr << *pos.filename << ':';
-    return ostr << pos.line << '.' << pos.column;
-  }
+    /// Whether yyla contains a lookahead.
+    bool yyempty = true;

 
 

-}
-#endif // not BISON_POSITION_HH]
-@output location.hh
-b4_copyright([Location class for Bison C++ parsers], [2002, 2003, 2004, 2005])[
+    /* State.  */
+    int yyn;
+    int yylen = 0;

 
 

-/**
- ** \file location.hh
- ** Define the location class.
- */
+    /* Error handling.  */
+    int yynerrs_ = 0;
+    int yyerrstatus_ = 0;

 
 

-#ifndef BISON_LOCATION_HH
-# define BISON_LOCATION_HH
+    /// The lookahead symbol.
+    symbol_type yyla;]b4_locations_if([[

 
 

-# include <iostream>
-# include <string>
-# include "position.hh"
+    /// The locations where the error started and ended.
+    stack_symbol_type yyerror_range[3];]])[

 
 

-namespace yy
-{
+    /// $$ and @@$.
+    stack_symbol_type yylhs;

 
 

-  /// Abstract a location.
-  class location
-  {
-    /** \name Ctor & dtor.
-     ** \{ */
-  public:
-    /// Construct a location.
-    location () :
-      begin (),
-      end ()
-    {
-    }
-    /** \} */
+    /// The return value of parse().
+    int yyresult;

 
 

+    YYCDEBUG << "Starting parse" << std::endl;

 
 

-    /** \name Line and Column related manipulators
-     ** \{ */
-  public:
-    /// Reset initial location to final location.
-    inline void step ()
+]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 $$=$1 action is NOT applied when using
+       variants.  */
+    b4_symbol_variant([[yyr1_@{yyn@}]], [yylhs.value], [build])],[
+    /* If YYLEN is nonzero, implement the default value of the action:
+       `$$ = $1'.  Otherwise, use the top of the stack.
+
+       Otherwise, the following line sets YYLHS.VALUE to garbage.
+       This behavior is undocumented and Bison
+       users should not rely upon it.  */
+    if (yylen)
+      yylhs.value = yystack_@{yylen - 1@}.value;
+    else
+      yylhs.value = yystack_@{0@}.value;])[
+]b4_locations_if([dnl
+[
+    // Compute the default @@$.

     {
     {

-      begin = end;
-    }
+      slice<stack_symbol_type, stack_type> slice (yystack_, yylen);
+      YYLLOC_DEFAULT (yylhs.location, slice, yylen);
+    }]])[

 
 

-    /// Extend the current location to the COUNT next columns.
-    inline void columns (unsigned int count = 1)
+    // Perform the reduction.
+    YY_REDUCE_PRINT (yyn);
+    try

     {
     {

-      end += count;
+      switch (yyn)
+      {
+]b4_user_actions[
+       default:
+          break;
+      }

     }
     }

-
-    /// Extend the current location to the COUNT next lines.
-    inline void lines (unsigned int count = 1)
+    catch (const syntax_error& yyexc)

     {
     {

-      end.lines (count);
+      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, 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);]])[

 
 

-  public:
-    /// Beginning of the located region.
-    position begin;
-    /// End of the located region.
-    position end;
-  };
+      /* 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;
+  }

 
 

-  /// Join two location objects to create a location.
-  inline const location operator+ (const location& begin, const location& end)
+  // Generate an error message.
+  std::string
+  ]b4_parser_class_name[::yysyntax_error_ (]dnl
+b4_error_verbose_if([state_type yystate, int yytoken],
+                    [int, int])[)

   {
   {

-    location res = begin;
-    res.end = end.end;
-    return res;
+    std::string yyres;]b4_error_verbose_if([[
+    int yyn = yypact_[yystate];
+    if (yypact_ninf_ < yyn && yyn <= yylast_)
+      {
+       /* 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_;
+
+        // 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];
+        yyarg[yycount++] = yytname_[yytoken];
+       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_(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;
+      }
+    else
+  ]])dnl
+[    yyres = YY_("syntax error");
+    return yyres;

   }
 
   }
 

-  /// Add two location objects.
-  inline const location operator+ (const location& begin, unsigned int width)
+
+  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_[] =

   {
   {

-    location res = begin;
-    res.columns (width);
-    return res;
-  }
+  ]b4_tname[
+  };
+#endif

 
 

-  /// Add and assign a location.
-  inline location& operator+= (location& res, unsigned int width)
+#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_ ()

   {
   {

-    res.columns (width);
-    return res;
+    *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;

   }
 
   }
 

-  /** \brief Intercept output stream redirection.
-   ** \param ostr the destination output stream
-   ** \param loc a reference to the location to redirect
-   **
-   ** Avoid duplicate information.
-   */
-  inline std::ostream& operator<< (std::ostream& ostr, const location& loc)
+  // 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)

   {
   {

-    position last = loc.end - 1;
-    ostr << loc.begin;
-    if (last.filename
-       && (!loc.begin.filename
-           || *loc.begin.filename != *last.filename))
-      ostr << '-' << last;
-    else if (loc.begin.line != last.line)
-      ostr << '-' << last.line  << '.' << last.column;
-    else if (loc.begin.column != last.column)
-      ostr << '-' << last.column;
-    return ostr;
+    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

 
 

-}
-
-#endif // not BISON_LOCATION_HH]
+]b4_lex_symbol_if([], [b4_yytranslate_define])[
+]b4_namespace_close[
+]b4_epilogue[]dnl
+m4_divert_pop(0)
+m4_popdef([b4_copyright_years])dnl