Comment changes.

[bison.git] / data / lalr1.cc

diff --git a/data/lalr1.cc b/data/lalr1.cc
index 7a048152ee8d383a0bc50efa143db28b08e0d594..86e6fd086db3d0eb146a87bdaf8c1d4dbfb6f479 100644 (file)
--- a/data/lalr1.cc
+++ b/data/lalr1.cc
@@ -18,39 +18,39 @@
 
 m4_include(b4_pkgdatadir/[c++.m4])
 
 
 m4_include(b4_pkgdatadir/[c++.m4])
 

-# b4_table_define(TABLE-NAME, CONTENT)
-# ------------------------------------
+
+# 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.
 # Define "parser::yy<TABLE-NAME>_" which contents is CONTENT.

-m4_define([b4_table_define],
-[const b4_int_type_for([$2])
+m4_define([b4_integral_parser_table_define],
+[  const b4_int_type_for([$2])

   b4_parser_class_name::yy$1_[[]] =
   {
   $2
   b4_parser_class_name::yy$1_[[]] =
   {
   $2

-  }dnl
+  };dnl

 ])
 
 ])
 

+

 # b4_symbol_value_template(VAL, [TYPE])
 # -------------------------------------
 # b4_symbol_value_template(VAL, [TYPE])
 # -------------------------------------

-# Same as b4_symbol_value, but used in a template method.
+# 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])
 
 m4_copy([b4_symbol_value], [b4_symbol_value_template])
 

-# How the semantic value is extracted when using variants.
-b4_variant_if([
-  # b4_symbol_value(VAL, [TYPE])
-  # ----------------------------
-  m4_define([b4_symbol_value],
-  [m4_ifval([$2],
-            [$1.as<$2>()],
-            [$1])])
-
-  # b4_symbol_value_template(VAL, [TYPE])
-  # -------------------------------------
-  # Same as b4_symbol_value, but used in a template method.
-  m4_define([b4_symbol_value_template],
-  [m4_ifval([$2],
-            [$1.template as<$2>()],
-            [$1])])
-]) # b4_variant_if
+
+# b4_lex_symbol_if([IF-YYLEX-RETURNS-A-COMPLETE-SYMBOL], [IF-NOT])
+# ----------------------------------------------------------------
+m4_define([b4_lex_symbol_if],
+[b4_percent_define_ifdef([[lex_symbol]], [$1], [$2])])

 
 
 # b4_assert_if([IF-ASSERTIONS-ARE-USED], [IF-NOT])
 
 
 # b4_assert_if([IF-ASSERTIONS-ARE-USED], [IF-NOT])


@@ -63,14 +63,14 @@ m4_define([b4_assert_if],
 # --------------------
 # Expansion of $<TYPE>$.
 m4_define([b4_lhs_value],
 # --------------------
 # Expansion of $<TYPE>$.
 m4_define([b4_lhs_value],

-[b4_symbol_value([yylhs.value], [$1])])
+          [b4_symbol_value([yylhs.value], [$1])])

 
 
 # b4_lhs_location()
 # -----------------
 # Expansion of @$.
 m4_define([b4_lhs_location],
 
 
 # b4_lhs_location()
 # -----------------
 # Expansion of @$.
 m4_define([b4_lhs_location],

-[yylhs.location])
+          [yylhs.location])

 
 
 # b4_rhs_data(RULE-LENGTH, NUM)
 
 
 # b4_rhs_data(RULE-LENGTH, NUM)


@@ -78,11 +78,11 @@ m4_define([b4_lhs_location],
 # Return the data corresponding to the symbol #NUM, where the current
 # rule has RULE-LENGTH symbols on RHS.
 m4_define([b4_rhs_data],
 # Return the data corresponding to the symbol #NUM, where the current
 # rule has RULE-LENGTH symbols on RHS.
 m4_define([b4_rhs_data],

-          [yystack_@{($1) - ($2)@}])
+          [yystack_@{b4_subtract($@)@}])

 
 
 # b4_rhs_state(RULE-LENGTH, NUM)
 
 
 # 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],
 # The state corresponding to the symbol #NUM, where the current
 # rule has RULE-LENGTH symbols on RHS.
 m4_define([b4_rhs_state],


@@ -105,91 +105,199 @@ m4_define([b4_rhs_location],
           [b4_rhs_data([$1], [$2]).location])
 
 
           [b4_rhs_data([$1], [$2]).location])
 
 

-# b4_symbol(NUM, FIELD)
-# ---------------------
-# Recover a FIELD about symbol #NUM.  Thanks to m4_indir, fails if
-# undefined.
-m4_define([b4_symbol],
-[m4_indir([b4_symbol($1, $2)])])
-
-
-# b4_symbol_actions(FILENAME, LINENO,
-#                   SYMBOL-TAG, SYMBOL-NUM,
-#                   SYMBOL-ACTION, SYMBOL-TYPENAME)
-# -------------------------------------------------
+# 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.
 # Same as in C, but using references instead of pointers.

-m4_define([b4_symbol_actions],
+m4_define([b4_symbol_action],
+[b4_symbol_if([$1], [has_$2],

 [m4_pushdef([b4_dollar_dollar],
 [m4_pushdef([b4_dollar_dollar],

-            [b4_symbol_value_template([yysym.value], [$6])])dnl
+    [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
 m4_pushdef([b4_at_dollar], [yysym.location])dnl

-      case $4: // $3
-b4_syncline([$2], [$1])
-        $5;
+      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;
 b4_syncline([@oline@], [@ofile@])
         break;

+

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

-])
+])])

 
 

+# b4_symbol_constructor_declaration_(SYMBOL-NUMBER)
+# -------------------------------------------------
+# Declare the overloaded version of make_symbol for the (common) type of
+# these SYMBOL-NUMBERS.  Use at class-level.
+m4_define([b4_symbol_constructor_declaration_],
+[b4_symbol_if([$1], [is_token], [b4_symbol_if([$1], [has_id],
+[    static inline
+    symbol_type
+    make_[]b4_symbol_([$1], [id]) (dnl
+b4_args(b4_symbol_if([$1], [has_type],
+                     [const b4_symbol([$1], [type])& v]),
+        b4_locations_if([const location_type& l])));

 
 

-# b4_symbol_action_(NUM)
-# ----------------------
-# Invoke b4_dollar_dollar(SYMBOL_TYPENAME) for each symbol.
-m4_define([b4_symbol_action_],
-[m4_ifval(b4_symbol([$1], [type_name]),
-[      case b4_symbol([$1], [number]): // b4_symbol([$1], [tag])
-        b4_dollar_dollar([b4_symbol([$1], [number])],
-                         [b4_symbol([$1], [tag])],
-                         [b4_symbol([$1], [type_name])]);
-       break;
-])])
+])])])

 
 
 
 

-# b4_symbol_variant(YYTYPE, YYVAL, ACTION, [ARGS])
+# b4_symbol_constructor_declarations
+# ----------------------------------
+# Declare symbol constructors for all the value types.
+# Use at class-level.
+m4_define([b4_symbol_constructor_declarations],
+[b4_variant_if([
+    // Symbol constructors declarations.
+b4_symbol_foreach([b4_symbol_constructor_declaration_])])])
+
+
+
+# b4_symbol_constructor_definition_(SYMBOL-NUMBER)

 # ------------------------------------------------
 # ------------------------------------------------

-# Run some ACTION ("build", or "destroy") on YYVAL of symbol type
-# YYTYPE.
-m4_define([b4_symbol_variant],
-[m4_pushdef([b4_dollar_dollar],
-            [$2.$3<$][3>(m4_shift3($@))])dnl
-  switch ($1)
-    {
-m4_map([b4_symbol_action_], m4_defn([b4_symbol_numbers]))
-     default:
-       break;
-    }
-m4_popdef([b4_dollar_dollar])dnl
-])
+# Define symbol constructor for this SYMBOL-NUMBER.
+m4_define([b4_symbol_constructor_definition_],
+[b4_symbol_if([$1], [is_token], [b4_symbol_if([$1], [has_id],
+[  b4_parser_class_name::symbol_type
+  b4_parser_class_name::make_[]b4_symbol_([$1], [id]) (dnl
+b4_args(b4_symbol_if([$1], [has_type],
+                     [const b4_symbol([$1], [type])& v]),
+        b4_locations_if([const location_type& l])))
+  {
+    return symbol_type (b4_args([yytranslate_ (token::b4_symbol([$1], [id]))],
+                                b4_symbol_if([$1], [has_type], [v]),
+                                b4_locations_if([l])));
+  }

 
 

+])])])

 
 

-# _b4_char_sizeof_counter
-# -----------------------
-# A counter used by _b4_char_sizeof_dummy to create fresh symbols.
-m4_define([_b4_char_sizeof_counter],
-[0])

 
 

-# _b4_char_sizeof_dummy
-# ---------------------
-# At each call return a new C++ identifier.
-m4_define([_b4_char_sizeof_dummy],
-[m4_define([_b4_char_sizeof_counter], m4_incr(_b4_char_sizeof_counter))dnl
-dummy[]_b4_char_sizeof_counter])
+# b4_symbol_constructor_definitions
+# ----------------------------------
+# Define the overloaded versions of make_symbol for all the value types.
+m4_define([b4_symbol_constructor_definitions],
+[[  // symbol_base_type.
+  template <typename Exact>
+  ]b4_parser_class_name[::symbol_base_type<Exact>::symbol_base_type ()
+    : value()]b4_locations_if([
+    , location()])[
+  {
+  }]b4_locations_if([[

 
 

+  template <typename Exact>
+  ]b4_parser_class_name[::symbol_base_type<Exact>::symbol_base_type (const location_type& l)
+    : value()
+    , location(l)
+  {
+  }]])[

 
 

-# b4_char_sizeof(SYMBOL-NUM)
-# --------------------------
-# To be mapped on the list of type names to produce:
-#
-#    char dummy1[sizeof(type_name_1)];
-#    char dummy2[sizeof(type_name_2)];
-#
-# for defined type names.
-# $3 is doubly-quoted, do not quote it again.
-m4_define([b4_char_sizeof],
-[m4_ifval(b4_symbol([$1], [type_name]),
-[
-      char _b4_char_sizeof_dummy@{sizeof([b4_symbol([$1], [type_name])])@}; // b4_symbol([$1], [tag])])dnl
-])
+  template <typename Exact>
+  ]b4_parser_class_name[::symbol_base_type<Exact>::symbol_base_type (]b4_args(
+          [const semantic_type& v],
+          b4_locations_if([const location_type& l]))[)
+    : value(v)]b4_locations_if([
+    , location(l)])[
+  {
+  }
+
+  template <typename Exact>
+  const Exact&
+  ]b4_parser_class_name[::symbol_base_type<Exact>::self () const
+  {
+    return static_cast<const Exact&>(*this);
+  }
+
+  template <typename Exact>
+  Exact&
+  ]b4_parser_class_name[::symbol_base_type<Exact>::self ()
+  {
+    return static_cast<Exact&>(*this);
+  }
+
+  template <typename Exact>
+  int
+  ]b4_parser_class_name[::symbol_base_type<Exact>::type_get () const
+  {
+    return self ().type_get_ ();
+  }
+
+  // symbol_type.
+  ]b4_parser_class_name[::symbol_type::symbol_type ()
+    : super_type ()
+    , type ()
+  {
+  }
+
+  ]b4_parser_class_name[::symbol_type::symbol_type (]b4_args(
+                [int t],
+                b4_locations_if([const location_type& l]))[)
+    : super_type (]b4_locations_if([l])[)
+    , type (t)
+  {
+  }
+
+  ]b4_parser_class_name[::symbol_type::symbol_type (]b4_args(
+                 [int t],
+                 [const semantic_type& v],
+                 b4_locations_if([const location_type& l]))[)
+    : super_type (v]b4_locations_if([, l])[)
+    , type (t)
+  {
+  }
+
+  int
+  ]b4_parser_class_name[::symbol_type::type_get_ () const
+  {
+    return type;
+  }
+]b4_lex_symbol_if([[
+  ]b4_parser_class_name[::token_type
+  ]b4_parser_class_name[::symbol_type::token () const
+  {
+    // YYTOKNUM[NUM] -- (External) token number corresponding to the
+    // (internal) symbol number NUM (which must be that of a token).  */
+    static
+    const ]b4_int_type_for([b4_toknum])[
+    yytoken_number_[] =
+    {
+  ]b4_toknum[
+    };
+    return static_cast<token_type> (yytoken_number_[type]);
+  }
+]])[
+
+]b4_variant_if(
+[  // Implementation of make_symbol for each symbol type.
+b4_symbol_foreach([b4_symbol_constructor_definition_])])])
+
+
+# b4_yytranslate_definition
+# -------------------------
+# Define yytranslate_.  Sometimes we want it in the header file,
+# sometimes the cc file suffices.
+m4_define([b4_yytranslate_definition],
+[[  // Symbol number corresponding to token number t.
+  ]b4_parser_class_name[::token_number_type
+  ]b4_parser_class_name[::yytranslate_ (]b4_lex_symbol_if([token_type],
+                                                          [int])[ t)
+  {
+    static
+    const token_number_type
+    translate_table[] =
+    {
+]b4_translate[
+    };
+    const unsigned int user_token_number_max_ = ]b4_user_token_number_max[;
+    const token_number_type undef_token_ = ]b4_undef_token_number[;
+
+    if (static_cast<int>(t) <= yyeof_)
+      return yyeof_;
+    else if (static_cast<unsigned int> (t) <= user_token_number_max_)
+      return translate_table[t];
+    else
+      return undef_token_;
+  }
+]])

 
 
 m4_pushdef([b4_copyright_years],
 
 
 m4_pushdef([b4_copyright_years],


@@ -202,15 +310,17 @@ m4_define([b4_parser_class_name],
 b4_defines_if([],
               [b4_fatal([b4_skeleton[: using %%defines is mandatory]])])
 
 b4_defines_if([],
               [b4_fatal([b4_skeleton[: using %%defines is mandatory]])])
 

-# Backward compatibility.
+b4_locations_if(
+[# Backward compatibility.

 m4_define([b4_location_constructors])
 m4_define([b4_location_constructors])

-m4_include(b4_pkgdatadir/[location.cc])
+m4_include(b4_pkgdatadir/[location.cc])])
+m4_include(b4_pkgdatadir/[stack.hh])
+b4_variant_if([m4_include(b4_pkgdatadir/[variant.hh])])

 
 # We do want M4 expansion after # for CPP macros.
 m4_changecom()
 m4_divert_push(0)dnl
 
 # We do want M4 expansion after # for CPP macros.
 m4_changecom()
 m4_divert_push(0)dnl

-b4_defines_if(
-[@output(b4_spec_defines_file@)@
+@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.
 [
 b4_copyright([Skeleton interface for Bison LALR(1) parsers in C++])
 dnl FIXME: This is wrong, we want computed header guards.
 [


@@ -227,99 +337,12 @@ dnl FIXME: This is wrong, we want computed header guards.
 #include "stack.hh"
 
 ]b4_namespace_open[
 #include "stack.hh"
 
 ]b4_namespace_open[

-  class position;
-  class location;
-]b4_variant_if(
-[[
-  /// A char[S] buffer to store and retrieve objects.
-  ///
-  /// Sort of a variant, but does not keep track of the nature
-  /// of the stored data, since that knowledge is available
-  /// via the current state.
-  template <size_t S>
-  struct variant
-  {]b4_assert_if([
-    /// Whether something is contained.
-    bool built;
-
-    /// Initially uninitialized.
-    variant ()
-      : built(false)
-    {}])[
-
-    /// Instantiate a \a T in here.
-    template <typename T>
-    inline T&
-    build()
-    {]b4_assert_if([
-      assert(!built);
-      built = true;])[
-      return *new (buffer) T;
-    }
-
-    /// Instantiate a \a T in here from \a t.
-    template <typename T>
-    inline T&
-    build(const T& t)
-    {]b4_assert_if([
-      assert(!built);
-      built = true;])[
-      return *new (buffer) T(t);
-    }
-
-    /// Accessor to a built \a T.
-    template <typename T>
-    inline T&
-    as()
-    {]b4_assert_if([
-      assert(built);])[
-      return reinterpret_cast<T&>(buffer);
-    }
-
-    /// Const accessor to a built \a T (for %printer).
-    template <typename T>
-    inline const T&
-    as() const
-    {]b4_assert_if([
-      assert(built);])[
-      return reinterpret_cast<const T&>(buffer);
-    }
-
-    /// Swap the content with \a other.
-    template <typename T>
-    inline void
-    swap(variant<S>& other)
-    {
-      std::swap(as<T>(), other.as<T>());
-    }
-
-    /// Assign the content of \a other to this.
-    /// Destroys \a other.
-    template <typename T>
-    inline void
-    build(variant<S>& other)
-    {
-      build<T>();
-      swap<T>(other);
-      other.destroy<T>();
-    }
-
-    /// Destroy the stored \a T.
-    template <typename T>
-    inline void
-    destroy()
-    {
-      as<T>().~T();]b4_assert_if([
-      built = false;])[
-    }
-
-    /// A buffer large enough to store any of the semantic values.
-    char buffer[S];
-  };
-]])[
+]b4_locations_if([  class position;
+  class location;])[
+]b4_variant_if([b4_variant_definition])[

 ]b4_namespace_close[
 
 ]b4_namespace_close[
 

-#include "location.hh"
+]b4_locations_if([#include "location.hh"])[

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


@@ -339,7 +362,8 @@ dnl FIXME: This is wrong, we want computed header guards.
 # define YYTOKEN_TABLE ]b4_token_table[
 #endif
 
 # define YYTOKEN_TABLE ]b4_token_table[
 #endif
 

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


@@ -356,7 +380,7 @@ do {                                                            \
       (Current).begin = (Current).end = (Rhs)[0].location.end; \
     }                                                           \
 } while (false)
       (Current).begin = (Current).end = (Rhs)[0].location.end; \
     }                                                           \
 } while (false)

-#endif
+#endif]])[

 
 ]b4_namespace_open[
 
 
 ]b4_namespace_open[
 


@@ -368,8 +392,7 @@ do {                                                            \
 ]b4_variant_if(
 [    /// An auxiliary type to compute the largest semantic type.
     union union_type
 ]b4_variant_if(
 [    /// An auxiliary type to compute the largest semantic type.
     union union_type

-    {]m4_map([b4_char_sizeof], m4_defn([b4_symbol_numbers]))[
-    };
+    {]b4_type_foreach([b4_char_sizeof])[};

 
     /// Symbol semantic values.
     typedef variant<sizeof(union_type)> semantic_type;],
 
     /// Symbol semantic values.
     typedef variant<sizeof(union_type)> semantic_type;],


@@ -383,9 +406,9 @@ m4_ifdef([b4_stype],
 [[    typedef YYSTYPE semantic_type;]])])])[
 #else
     typedef YYSTYPE semantic_type;
 [[    typedef YYSTYPE semantic_type;]])])])[
 #else
     typedef YYSTYPE semantic_type;

-#endif
+#endif]b4_locations_if([

     /// Symbol locations.
     /// Symbol locations.

-    typedef ]b4_percent_define_get([[location_type]])[ location_type;
+    typedef b4_percent_define_get([[location_type]]) location_type;])[

     /// Tokens.
     struct token
     {
     /// Tokens.
     struct token
     {


@@ -417,10 +440,10 @@ m4_ifdef([b4_stype],
 #endif
 
   private:
 #endif
 
   private:

-    /// 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);

 
     /// Generate an error message.
     /// \param state   the state where the error occurred.
 
     /// Generate an error message.
     /// \param state   the state where the error occurred.


@@ -432,52 +455,23 @@ m4_ifdef([b4_stype],
 
     /// Internal symbol numbers.
     typedef ]b4_int_type_for([b4_translate])[ token_number_type;
 
     /// Internal symbol numbers.
     typedef ]b4_int_type_for([b4_translate])[ token_number_type;

-    /* Tables.  */
-    /// For a state, the index in \a yytable_ of its portion.
-    static const ]b4_int_type_for([b4_pact])[ yypact_[];

     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

-    /// 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.
     virtual void yy_reduce_print_ (int r);
     /// Print the state stack on the debug stream.
     /// Report on the debug stream that the rule \a r is going to be reduced.
     virtual void yy_reduce_print_ (int r);
     /// Print the state stack on the debug stream.


@@ -489,7 +483,7 @@ m4_ifdef([b4_stype],
 #endif
 
     /// Convert a scanner token number \a t to a symbol number.
 #endif
 
     /// Convert a scanner token number \a t to a symbol number.

-    token_number_type yytranslate_ (int t);
+    static inline token_number_type yytranslate_ (]b4_lex_symbol_if([token_type], [int])[ t);

 
     /// A complete symbol, with its type.
     template <typename Exact>
 
     /// A complete symbol, with its type.
     template <typename Exact>


@@ -498,8 +492,11 @@ m4_ifdef([b4_stype],
       /// Default constructor.
       inline symbol_base_type ();
 
       /// Default constructor.
       inline symbol_base_type ();
 

-      /// Constructor.
-      inline symbol_base_type (const semantic_type& v, const location_type& l);
+      /// Constructor.]b4_locations_if([
+      inline symbol_base_type (const location_type& l)])[;
+      inline symbol_base_type (]b4_args(
+        [const semantic_type& v],
+        b4_locations_if([const location_type& l]))[);

 
       /// Return this with its exact type.
       const Exact& self () const;
 
       /// Return this with its exact type.
       const Exact& self () const;


@@ -509,10 +506,10 @@ m4_ifdef([b4_stype],
       int type_get () const;
 
       /// The semantic value.
       int type_get () const;
 
       /// The semantic value.

-      semantic_type value;
+      semantic_type value;]b4_locations_if([

 
       /// The location.
 
       /// The location.

-      location_type location;
+      location_type location;])[

     };
 
 #if YYDEBUG
     };
 
 #if YYDEBUG


@@ -532,6 +529,7 @@ m4_ifdef([b4_stype],
     inline void yy_destroy_ (const char* yymsg,
                              symbol_base_type<Exact>& yysym) const;
 
     inline void yy_destroy_ (const char* yymsg,
                              symbol_base_type<Exact>& yysym) const;
 

+  public:

     /// Element of the stack: a state and its attributes.
     struct symbol_type : symbol_base_type<symbol_type>
     {
     /// Element of the stack: a state and its attributes.
     struct symbol_type : symbol_base_type<symbol_type>
     {


@@ -542,16 +540,26 @@ m4_ifdef([b4_stype],
       inline symbol_type ();
 
       /// Constructor.
       inline symbol_type ();
 
       /// Constructor.

-      inline symbol_type (int t,
-                          const semantic_type& v, const location_type& l);
+      inline symbol_type (]b4_args([int t],
+                                   [const semantic_type& v],
+                                   b4_locations_if([const location_type& l]))[);
+
+      inline symbol_type (]b4_args([int t],
+                                   b4_locations_if([const location_type& l]))[);

 
       /// The symbol type.
       int type;
 
       /// Return the type corresponding to this state.
       inline int type_get_ () const;
 
       /// The symbol type.
       int type;
 
       /// Return the type corresponding to this state.
       inline int type_get_ () const;

+
+      /// Its token.
+      inline token_type token () const;

     };
 
     };
 

+]b4_symbol_constructor_declarations[
+
+  private:

     /// Element of the stack: a state and its attributes.
     struct stack_symbol_type : symbol_base_type<stack_symbol_type>
     {
     /// Element of the stack: a state and its attributes.
     struct stack_symbol_type : symbol_base_type<stack_symbol_type>
     {


@@ -562,8 +570,9 @@ m4_ifdef([b4_stype],
       inline stack_symbol_type ();
 
       /// Constructor.
       inline stack_symbol_type ();
 
       /// Constructor.

-      inline stack_symbol_type (state_type s,
-                                const semantic_type& v, const location_type& l);
+      inline stack_symbol_type (]b4_args([state_type s],
+                                         [const semantic_type& v],
+                                         b4_locations_if([const location_type& l]))[);

 
       /// The state.
       state_type state;
 
       /// The state.
       state_type state;


@@ -597,20 +606,23 @@ m4_ifdef([b4_stype],
     inline void yypop_ (unsigned int n = 1);
 
     /* Constants.  */
     inline void yypop_ (unsigned int n = 1);
 
     /* 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_;
+    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.
+    };
+

 ]b4_parse_param_vars[
   };
 
 ]b4_parse_param_vars[
   };
 

+]b4_lex_symbol_if([b4_yytranslate_definition])[
+]b4_lex_symbol_if([b4_symbol_constructor_definitions])[

 ]b4_namespace_close[
 
 ]b4_percent_define_flag_if([[global_tokens_and_yystype]],
 ]b4_namespace_close[
 
 ]b4_percent_define_flag_if([[global_tokens_and_yystype]],


@@ -624,7 +636,6 @@ m4_ifdef([b4_stype],
 b4_percent_code_get([[provides]])[]dnl
 
 [#endif /* ! defined PARSER_HEADER_H */]
 b4_percent_code_get([[provides]])[]dnl
 
 [#endif /* ! defined PARSER_HEADER_H */]

-])dnl

 @output(b4_parser_file_name@)@
 b4_copyright([Skeleton implementation for Bison LALR(1) parsers in C++])
 b4_percent_code_get([[top]])[]dnl
 @output(b4_parser_file_name@)@
 b4_copyright([Skeleton implementation for Bison LALR(1) parsers in C++])
 b4_percent_code_get([[top]])[]dnl


@@ -634,10 +645,9 @@ m4_if(b4_prefix, [yy], [],
 #define yylex   b4_prefix[]lex])[
 
 /* First part of user declarations.  */
 #define yylex   b4_prefix[]lex])[
 
 /* First part of user declarations.  */

-]b4_user_pre_prologue
+]b4_user_pre_prologue[

 
 

-b4_defines_if([[
-#include "@basename(]b4_spec_defines_file[@)"]])[
+#include "@basename(]b4_spec_defines_file[@)"

 
 /* User implementation prologue.  */
 ]b4_user_post_prologue
 
 /* User implementation prologue.  */
 ]b4_user_post_prologue


@@ -695,16 +705,15 @@ b4_percent_code_get[]dnl
 
 #endif /* !YYDEBUG */
 
 
 #endif /* !YYDEBUG */
 

-#define yyerrok                (yyerrstatus_ = 0)
-#define yyclearin      (yychar = yyempty_)
+#define yyerrok         (yyerrstatus_ = 0)
+#define yyclearin       (yyempty = true)

 
 

-#define YYACCEPT       goto yyacceptlab
-#define YYABORT                goto yyabortlab
-#define YYERROR                goto yyerrorlab
+#define YYACCEPT        goto yyacceptlab
+#define YYABORT         goto yyabortlab
+#define YYERROR         goto yyerrorlab

 #define YYRECOVERING()  (!!yyerrstatus_)
 
 #define YYRECOVERING()  (!!yyerrstatus_)
 

-]b4_namespace_open[
-#if YYERROR_VERBOSE
+]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
 
   /* Return YYSTR after stripping away unnecessary quotes and
      backslashes, so that it's suitable for yyerror.  The heuristic is


@@ -742,8 +751,7 @@ b4_percent_code_get[]dnl
 
     return yystr;
   }
 
     return yystr;
   }

-
-#endif
+]])[

 
   /// Build a parser object.
   ]b4_parser_class_name::b4_parser_class_name[ (]b4_parse_param_decl[)]m4_ifset([b4_parse_param], [
 
   /// Build a parser object.
   ]b4_parser_class_name::b4_parser_class_name[ (]b4_parse_param_decl[)]m4_ifset([b4_parse_param], [


@@ -764,61 +772,7 @@ b4_percent_code_get[]dnl
   | Symbol types.  |
   `---------------*/
 
   | Symbol types.  |
   `---------------*/
 

-  // symbol_base_type.
-  template <typename Exact>
-  ]b4_parser_class_name[::symbol_base_type<Exact>::symbol_base_type ()
-    : value()
-    , location()
-  {
-  }
-
-  template <typename Exact>
-  ]b4_parser_class_name[::symbol_base_type<Exact>::symbol_base_type (const semantic_type& v, const location_type& l)
-    : value(v)
-    , location(l)
-  {
-  }
-
-  template <typename Exact>
-  const Exact&
-  ]b4_parser_class_name[::symbol_base_type<Exact>::self () const
-  {
-    return static_cast<const Exact&>(*this);
-  }
-
-  template <typename Exact>
-  Exact&
-  ]b4_parser_class_name[::symbol_base_type<Exact>::self ()
-  {
-    return static_cast<Exact&>(*this);
-  }
-
-  template <typename Exact>
-  int
-  ]b4_parser_class_name[::symbol_base_type<Exact>::type_get () const
-  {
-    return self ().type_get_ ();
-  }
-
-  // symbol_type.
-  ]b4_parser_class_name[::symbol_type::symbol_type ()
-    : super_type ()
-    , type ()
-  {
-  }
-
-  ]b4_parser_class_name[::symbol_type::symbol_type (int t,
-                           const semantic_type& v, const location_type& l)
-    : super_type (v, l)
-    , type (t)
-  {
-  }
-
-  int
-  ]b4_parser_class_name[::symbol_type::type_get_ () const
-  {
-    return type;
-  }
+]b4_lex_symbol_if([], [b4_symbol_constructor_definitions])[

 
   // stack_symbol_type.
   ]b4_parser_class_name[::stack_symbol_type::stack_symbol_type ()
 
   // stack_symbol_type.
   ]b4_parser_class_name[::stack_symbol_type::stack_symbol_type ()


@@ -827,9 +781,11 @@ b4_percent_code_get[]dnl
   {
   }
 
   {
   }
 

-  ]b4_parser_class_name[::stack_symbol_type::stack_symbol_type (state_type s,
-                           const semantic_type& v, const location_type& l)
-    : super_type (v, l)
+  ]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)
   {
   }
     , state (s)
   {
   }


@@ -854,13 +810,13 @@ b4_percent_code_get[]dnl
     // User destructor.
     switch (yytype)
       {
     // User destructor.
     switch (yytype)
       {

-]m4_map([b4_symbol_actions], m4_defn([b4_symbol_destructors]))[
-       default:
-         break;
+]b4_symbol_foreach([b4_symbol_destructor])dnl
+[       default:
+          break;

       }]b4_variant_if([
 
     // Type destructor.
       }]b4_variant_if([
 
     // Type destructor.

-    b4_symbol_variant([[yytype]], [[yysym.value]], [[template destroy]])])[
+  b4_symbol_variant([[yytype]], [[yysym.value]], [[template destroy]])])[

   }
 
 #if YYDEBUG
   }
 
 #if YYDEBUG


@@ -871,11 +827,11 @@ b4_percent_code_get[]dnl
   {
     int yytype = yysym.type_get ();
     yyo << (yytype < yyntokens_ ? "token" : "nterm")
   {
     int yytype = yysym.type_get ();
     yyo << (yytype < yyntokens_ ? "token" : "nterm")

-        << ' ' << yytname_[yytype] << " ("
-        << yysym.location << ": ";
+        << ' ' << yytname_[yytype] << " ("]b4_locations_if([
+        << yysym.location << ": "])[;

     switch (yytype)
       {
     switch (yytype)
       {

-]m4_map([b4_symbol_actions], m4_defn([b4_symbol_printers]))dnl
+]b4_symbol_foreach([b4_symbol_printer])dnl

 [       default:
          break;
       }
 [       default:
          break;
       }


@@ -890,10 +846,16 @@ b4_percent_code_get[]dnl
     if (m)
       YY_SYMBOL_PRINT (m, sym);
 ]b4_variant_if(
     if (m)
       YY_SYMBOL_PRINT (m, sym);
 ]b4_variant_if(

-[[    yystack_.push (stack_symbol_type (s, semantic_type(), sym.location));
+[[    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])],
     ]b4_symbol_variant([[yystos_[s]]], [[yystack_[0].value]],
                        [build], [sym.value])],

-[    yystack_.push (stack_symbol_type (s, sym.value, sym.location));])[
+[[    yystack_.push (stack_symbol_type (]b4_args(
+                      [s],
+                      [sym.value],
+                      b4_locations_if([sym.location]))[));]])[

   }
 
   void
   }
 
   void


@@ -902,7 +864,10 @@ b4_percent_code_get[]dnl
     if (m)
       YY_SYMBOL_PRINT (m, s);
 ]b4_variant_if(
     if (m)
       YY_SYMBOL_PRINT (m, s);
 ]b4_variant_if(

-[[    yystack_.push (stack_symbol_type (s.state, semantic_type(), s.location));
+[[    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);])[
     ]b4_symbol_variant([[yystos_[s.state]]], [[yystack_[0].value]],
                        [build], [s.value])],
 [    yystack_.push (s);])[


@@ -944,8 +909,8 @@ b4_percent_code_get[]dnl
   int
   ]b4_parser_class_name[::parse ()
   {
   int
   ]b4_parser_class_name[::parse ()
   {

-    /// Coded type of the lookahead.
-    int yychar = yyempty_;
+    /// Whether yyla contains a lookahead.
+    bool yyempty = true;

 
     /* State.  */
     int yyn;
 
     /* State.  */
     int yyn;


@@ -957,10 +922,10 @@ b4_percent_code_get[]dnl
     int yyerrstatus_ = 0;
 
     /// The lookahead symbol.
     int yyerrstatus_ = 0;
 
     /// The lookahead symbol.

-    symbol_type yyla;
+    symbol_type yyla;]b4_locations_if([[

 
     /// The locations where the error started and ended.
 
     /// The locations where the error started and ended.

-    stack_symbol_type yyerror_range[2];
+    stack_symbol_type yyerror_range[2];]])[

 
     /// $$ and @@$.
     stack_symbol_type yylhs;
 
     /// $$ and @@$.
     stack_symbol_type yylhs;


@@ -1006,27 +971,19 @@ m4_popdef([b4_at_dollar])])dnl
       goto yydefault;
 
     /* Read a lookahead token.  */
       goto yydefault;
 
     /* Read a lookahead token.  */

-    if (yychar == yyempty_)
+    if (yyempty)

       {
       {

-       YYCDEBUG << "Reading a token: ";
-       yychar = ]b4_c_function_call([yylex], [int],
+        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
                                     [[YYSTYPE*], [&yyla.value]][]dnl
 b4_locations_if([, [[location*], [&yyla.location]]])dnl

-m4_ifdef([b4_lex_param], [, ]b4_lex_param))[;
-      }
-
-
-    /* Convert token to internal form.  */
-    if (yychar <= yyeof_)
-      {
-       yychar = yyla.type = yyeof_;
-       YYCDEBUG << "Now at end of input." << std::endl;
-      }
-    else
-      {
-       yyla.type = yytranslate_ (yychar);
-       YY_SYMBOL_PRINT ("Next token is", yyla);
+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.  */
 
     /* If the proper action on seeing token YYLA.TYPE is to reduce or
        to detect an error, take that action.  */


@@ -1045,7 +1002,7 @@ m4_ifdef([b4_lex_param], [, ]b4_lex_param))[;
       }
 
     /* Discard the token being shifted.  */
       }
 
     /* Discard the token being shifted.  */

-    yychar = yyempty_;
+    yyempty = true;

 
     /* Count tokens shifted since error; after three, turn off error
        status.  */
 
     /* Count tokens shifted since error; after three, turn off error
        status.  */


@@ -1074,7 +1031,7 @@ m4_ifdef([b4_lex_param], [, ]b4_lex_param))[;
     /* Variants are always initialized to an empty instance of the
        correct type. The default $$=$1 rule is NOT applied when using
        variants */
     /* Variants are always initialized to an empty instance of the
        correct type. The default $$=$1 rule is NOT applied when using
        variants */

-    ]b4_symbol_variant([[yyr1_@{yyn@}]], [yylhs.value], [build])[],[
+    ]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.
 
     /* If YYLEN is nonzero, implement the default value of the action:
        `$$ = $1'.  Otherwise, use the top of the stack.
 


@@ -1085,18 +1042,19 @@ m4_ifdef([b4_lex_param], [, ]b4_lex_param))[;
       yylhs.value = yystack_@{yylen - 1@}.value;
     else
       yylhs.value = yystack_@{0@}.value;])[
       yylhs.value = yystack_@{yylen - 1@}.value;
     else
       yylhs.value = yystack_@{0@}.value;])[

-
+]b4_locations_if([dnl
+[

     // Compute the default @@$.
     {
       slice<stack_symbol_type, stack_type> slice (yystack_, yylen);
       YYLLOC_DEFAULT (yylhs.location, slice, yylen);
     // Compute the default @@$.
     {
       slice<stack_symbol_type, stack_type> slice (yystack_, yylen);
       YYLLOC_DEFAULT (yylhs.location, slice, yylen);

-    }
+    }]])[

 
     // Perform the reduction.
     YY_REDUCE_PRINT (yyn);
     switch (yyn)
       {
 
     // Perform the reduction.
     YY_REDUCE_PRINT (yyn);
     switch (yyn)
       {

-       ]b4_user_actions[
+]b4_user_actions[

        default:
           break;
       }
        default:
           break;
       }


@@ -1111,16 +1069,18 @@ m4_ifdef([b4_lex_param], [, ]b4_lex_param))[;
     yylhs.state = yystate;
     YY_SYMBOL_PRINT ("-> $$ =", yylhs);
 ]b4_variant_if([[
     yylhs.state = yystate;
     YY_SYMBOL_PRINT ("-> $$ =", yylhs);
 ]b4_variant_if([[

-    // Destroy the lhs symbols.
+    // Destroy the rhs symbols.

     for (int i = 0; i < yylen; ++i)
     for (int i = 0; i < yylen; ++i)

-      // Destroy a variant which value may have be swapped with
-      // yylhs.value.  The value of yylhs.value (hence maybe one of
-      // these lhs symbols) depends on what does the default
-      // contruction for this type.  In the case of pointers for
-      // instance, nothing is done, so the value is junk.  Therefore
-      // do not try to report the content in the debug trace, it's
-      // junk.  Hence yymsg = 0.  Besides, that keeps exactly the same
-      // traces as with the other Bison skeletons.
+      // 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);
       yy_destroy_ (0, yystack_[i]);]])[
 
     yypop_ (yylen);


@@ -1131,33 +1091,32 @@ m4_ifdef([b4_lex_param], [, ]b4_lex_param))[;
     yypush_ (0, yylhs);
     goto yynewstate;
 
     yypush_ (0, yylhs);
     goto yynewstate;
 

-  /*------------------------------------.
-  | yyerrlab -- here on detecting error |
-  `------------------------------------*/
+  /*--------------------------------------.
+  | yyerrlab -- here on detecting error.  |
+  `--------------------------------------*/

   yyerrlab:
     /* If not already recovering from an error, report this error.  */
     if (!yyerrstatus_)
       {
        ++yynerrs_;
   yyerrlab:
     /* If not already recovering from an error, report this error.  */
     if (!yyerrstatus_)
       {
        ++yynerrs_;

-       error (yyla.location, yysyntax_error_ (yystate, yyla.type));
+       error (]b4_args(b4_locations_if([yyla.location]),
+                        [yysyntax_error_ (yystate, yyla.type)])[);

       }
 
       }
 

-    yyerror_range[0].location = yyla.location;
+]b4_locations_if([[
+    yyerror_range[0].location = yyla.location;]])[

     if (yyerrstatus_ == 3)
       {
        /* If just tried and failed to reuse lookahead token after an
     if (yyerrstatus_ == 3)
       {
        /* If just tried and failed to reuse lookahead token after an

-        error, discard it.  */
-
-       if (yychar <= yyeof_)
-         {
-            /* Return failure if at end of input.  */
-            if (yychar == yyeof_)
-              YYABORT;
-         }
-       else
-         {
-           yy_destroy_ ("Error: discarding", yyla);
-           yychar = yyempty_;
+           error, discard it.  */
+
+        /* Return failure if at end of input.  */
+        if (yyla.type == yyeof_)
+          YYABORT;
+        else
+          {
+            yy_destroy_ ("Error: discarding", yyla);
+            yyempty = true;

          }
       }
 
          }
       }
 


@@ -1177,7 +1136,8 @@ m4_ifdef([b4_lex_param], [, ]b4_lex_param))[;
     if (false)
       goto yyerrorlab;
 
     if (false)
       goto yyerrorlab;
 

-    yyerror_range[0].location = yystack_[yylen - 1].location;
+]b4_locations_if([[
+    yyerror_range[0].location = yystack_[yylen - 1].location;]])[

     /* Do not reclaim the symbols of the rule which action triggered
        this YYERROR.  */
     yypop_ (yylen);
     /* Do not reclaim the symbols of the rule which action triggered
        this YYERROR.  */
     yypop_ (yylen);


@@ -1209,16 +1169,16 @@ m4_ifdef([b4_lex_param], [, ]b4_lex_param))[;
           // Pop the current state because it cannot handle the error token.
           if (yystack_.size () == 1)
             YYABORT;
           // Pop the current state because it cannot handle the error token.
           if (yystack_.size () == 1)
             YYABORT;

-
-          yyerror_range[0].location = yystack_[0].location;
+]b4_locations_if([[
+          yyerror_range[0].location = yystack_[0].location;]])[

           yy_destroy_ ("Error: popping", yystack_[0]);
           yypop_ ();
           yystate = yystack_[0].state;
           YY_STACK_PRINT ();
         }
           yy_destroy_ ("Error: popping", yystack_[0]);
           yypop_ ();
           yystate = yystack_[0].state;
           YY_STACK_PRINT ();
         }

-
+]b4_locations_if([[

       yyerror_range[1].location = yyla.location;
       yyerror_range[1].location = yyla.location;

-      YYLLOC_DEFAULT (error_token.location, (yyerror_range - 1), 2);
+      YYLLOC_DEFAULT (error_token.location, (yyerror_range - 1), 2);]])[

 
       /* Shift the error token.  */
       error_token.state = yystate = yyn;
 
       /* Shift the error token.  */
       error_token.state = yystate = yyn;


@@ -1237,7 +1197,7 @@ m4_ifdef([b4_lex_param], [, ]b4_lex_param))[;
     goto yyreturn;
 
   yyreturn:
     goto yyreturn;
 
   yyreturn:

-    if (yychar != yyempty_)
+    if (!yyempty)

       yy_destroy_ ("Cleanup: discarding lookahead", yyla);
 
     /* Do not reclaim the symbols of the rule which action triggered
       yy_destroy_ ("Cleanup: discarding lookahead", yyla);
 
     /* Do not reclaim the symbols of the rule which action triggered


@@ -1254,12 +1214,11 @@ m4_ifdef([b4_lex_param], [, ]b4_lex_param))[;
 
   // Generate an error message.
   std::string
 
   // Generate an error message.
   std::string

-  ]b4_parser_class_name[::yysyntax_error_ (int yystate, int]dnl
-b4_error_verbose_if([ tok])[)
+  ]b4_parser_class_name[::yysyntax_error_ (]dnl
+b4_error_verbose_if([int yystate, int yytoken],
+                    [int, int])[)

   {
   {

-    std::string res;
-    YYUSE (yystate);
-#if YYERROR_VERBOSE
+    std::string yyres;]b4_error_verbose_if([[

     int yyn = yypact_[yystate];
     if (yypact_ninf_ < yyn && yyn <= yylast_)
       {
     int yyn = yypact_[yystate];
     if (yypact_ninf_ < yyn && yyn <= yylast_)
       {


@@ -1270,79 +1229,64 @@ b4_error_verbose_if([ tok])[)
        /* Stay within bounds of both yycheck and yytname.  */
        int yychecklim = yylast_ - yyn + 1;
        int yyxend = yychecklim < yyntokens_ ? yychecklim : yyntokens_;
        /* Stay within bounds of both yycheck and yytname.  */
        int yychecklim = yylast_ - yyn + 1;
        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_[tok], etc.
-       // Until this gets fixed, this message appears in English only.
-       res = "syntax error, unexpected ";
-       res += yytnamerr_ (yytname_[tok]);
-       if (count < 5)
-         {
-           count = 0;
-           for (int x = yyxbegin; x < yyxend; ++x)
-             if (yycheck_[x + yyn] == x && x != yyterror_)
-               {
-                 res += (!count++) ? ", expecting " : " or ";
-                 res += yytnamerr_ (yytname_[x]);
-               }
-         }
+
+        // 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_)
+          {
+            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
       }
     else

-#endif
-      res = YY_("syntax error");
-    return res;
+  ]])dnl
+[    yyres = YY_("syntax error");
+    return yyres;

   }
 
 
   }
 
 

-  /* YYPACT[STATE-NUM] -- Index in YYTABLE of the portion describing
-     STATE-NUM.  */

   const ]b4_int_type(b4_pact_ninf, b4_pact_ninf) b4_parser_class_name::yypact_ninf_ = b4_pact_ninf[;
   const ]b4_int_type(b4_pact_ninf, b4_pact_ninf) b4_parser_class_name::yypact_ninf_ = b4_pact_ninf[;

-  ]b4_table_define([pact], [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.  */
-  ]b4_table_define([defact], [b4_defact])[;
-
-  /* YYPGOTO[NTERM-NUM].  */
-  ]b4_table_define([pgoto], [b4_pgoto])[;

 
 

-  /* YYDEFGOTO[NTERM-NUM].  */
-  ]b4_table_define([defgoto], [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) b4_parser_class_name::yytable_ninf_ = b4_table_ninf[;
   const ]b4_int_type(b4_table_ninf, b4_table_ninf) b4_parser_class_name::yytable_ninf_ = b4_table_ninf[;

-  ]b4_table_define([table], [b4_table])[;
-
-  /* YYCHECK.  */
-  ]b4_table_define([check], [b4_check])[;
-
-  /* STOS_[STATE-NUM] -- The (internal number of the) accessing
-     symbol of state STATE-NUM.  */
-  ]b4_table_define([stos], [b4_stos])[;

 
 

-#if YYDEBUG
-  /* TOKEN_NUMBER_[YYLEX-NUM] -- Internal symbol number corresponding
-     to YYLEX-NUM.  */
-  ]b4_table_define([token_number], [b4_toknum])[;
-#endif
-
-  /* YYR1[YYN] -- Symbol number of symbol that rule YYN derives.  */
-  ]b4_table_define([r1], [b4_r1])[;
-
-  /* YYR2[YYN] -- Number of symbols composing right hand side of rule YYN.  */
-  ]b4_table_define([r2], [b4_r2])[;
+]b4_parser_tables_define[

 
 #if YYDEBUG || YYERROR_VERBOSE || YYTOKEN_TABLE
   /* YYTNAME[SYMBOL-NUM] -- String name of the symbol SYMBOL-NUM.
 
 #if YYDEBUG || YYERROR_VERBOSE || YYTOKEN_TABLE
   /* YYTNAME[SYMBOL-NUM] -- String name of the symbol SYMBOL-NUM.


@@ -1355,8 +1299,7 @@ b4_error_verbose_if([ tok])[)
 #endif
 
 #if YYDEBUG
 #endif
 
 #if YYDEBUG

-  /* YYRLINE[YYN] -- Source line where rule number YYN was defined.  */
-  ]b4_table_define([rline], [b4_rline])[;
+]b4_integral_parser_table_define([rline], [b4_rline])[

 
   // Print the state stack on the debug stream.
   void
 
   // Print the state stack on the debug stream.
   void


@@ -1387,134 +1330,8 @@ b4_error_verbose_if([ tok])[)
   }
 #endif // YYDEBUG
 
   }
 #endif // YYDEBUG
 

-  /* YYTRANSLATE(YYLEX) -- Bison symbol number corresponding to YYLEX.  */
-  ]b4_parser_class_name[::token_number_type
-  ]b4_parser_class_name[::yytranslate_ (int t)
-  {
-    static
-    const token_number_type
-    translate_table[] =
-    {
-  ]b4_translate[
-    };
-    if ((unsigned int) t <= yyuser_token_number_max_)
-      return translate_table[t];
-    else
-      return yyundef_token_;
-  }
-
-  const int ]b4_parser_class_name[::yyeof_ = 0;
-  const int ]b4_parser_class_name[::yylast_ = ]b4_last[;
-  const int ]b4_parser_class_name[::yynnts_ = ]b4_nterms_number[;
-  const int ]b4_parser_class_name[::yyempty_ = -2;
-  const int ]b4_parser_class_name[::yyfinal_ = ]b4_final_state_number[;
-  const int ]b4_parser_class_name[::yyterror_ = 1;
-  const int ]b4_parser_class_name[::yyerrcode_ = 256;
-  const int ]b4_parser_class_name[::yyntokens_ = ]b4_tokens_number[;
-
-  const unsigned int ]b4_parser_class_name[::yyuser_token_number_max_ = ]b4_user_token_number_max[;
-  const ]b4_parser_class_name[::token_number_type ]b4_parser_class_name[::yyundef_token_ = ]b4_undef_token_number[;
-
+]b4_lex_symbol_if([], [b4_yytranslate_definition])[

 ]b4_namespace_close[
 ]b4_namespace_close[

-

 ]b4_epilogue[]dnl
 ]b4_epilogue[]dnl

-@output(b4_dir_prefix[]stack.hh@)@
-b4_copyright([Stack handling for Bison parsers in C++])[
-
-#ifndef BISON_STACK_HH
-# define BISON_STACK_HH
-
-#include <deque>
-
-]b4_namespace_open[
-  template <class T, class S = std::deque<T> >
-  class stack
-  {
-  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
-    typename S::size_type
-    size () const
-    {
-      return seq_.size ();
-    }
-
-    inline const_iterator begin () const { return seq_.rbegin (); }
-    inline const_iterator end ()   const { return seq_.rend ();   }
-
-  private:
-    /// The wrapped container.
-    S seq_;
-  };
-
-  /// Present a slice of the top of a stack.
-  template <class T, class S = stack<T> >
-  class slice
-  {
-  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_;
-  };
-]b4_namespace_close[
-
-#endif // not BISON_STACK_HH[]dnl
-]

 m4_divert_pop(0)
 m4_popdef([b4_copyright_years])dnl
 m4_divert_pop(0)
 m4_popdef([b4_copyright_years])dnl