variants: document move and swap

[bison.git] / data / glr.cc

diff --git a/data/glr.cc b/data/glr.cc
index 8f0027ee11e8725eae7392bc9308b898971279f1..3f46c95d40dcd0e49d70776833c35842e9bf27df 100644 (file)
--- a/data/glr.cc
+++ b/data/glr.cc
@@ -43,12 +43,17 @@
 #   user must initialize the first positions (in particular the
 #   filename member).
 
+b4_token_ctor_if([b4_variant_if([],
+  [b4_fatal_at(b4_percent_define_get_loc(api.token.constructor),
+               [cannot use '%s' without '%s'],
+               [%define api.token.constructor],
+               [%define api.value.type variant]))])])
+
 # We require a pure interface.
 m4_define([b4_pure_flag],      [1])
 
 m4_include(b4_pkgdatadir/[c++.m4])
-b4_locations_if([b4_percent_define_ifdef([[location_type]], [],
-                [m4_include(b4_pkgdatadir/[location.cc])])])
+b4_bison_locations_if([m4_include(b4_pkgdatadir/[location.cc])])
 
 m4_define([b4_parser_class_name],
           [b4_percent_define_get([[parser_class_name]])])
@@ -56,6 +61,17 @@ m4_define([b4_parser_class_name],
 # Save the parse parameters.
 m4_define([b4_parse_param_orig], m4_defn([b4_parse_param]))
 
+# b4_parse_param_wrap
+# -------------------
+# New ones.
+m4_ifset([b4_parse_param],
+[m4_define([b4_parse_param_wrap],
+           [[b4_namespace_ref::b4_parser_class_name[& yyparser], [[yyparser]]],]
+m4_defn([b4_parse_param]))],
+[m4_define([b4_parse_param_wrap],
+           [[b4_namespace_ref::b4_parser_class_name[& yyparser], [[yyparser]]]])
+])
+
 
 # b4_yy_symbol_print_define
 # -------------------------
@@ -81,12 +97,16 @@ b4_locations_if([,
 ]b4_parse_param_use[]dnl
 [  yyparser.yy_symbol_print_ (yytype, yyvaluep]b4_locations_if([, yylocationp])[);
 }
-]])
+]])[
 
+# Hijack the initial action to initialize the locations.
+]b4_bison_locations_if([m4_define([b4_initial_action],
+[yylloc.initialize ();]m4_ifdef([b4_initial_action], [
+m4_defn([b4_initial_action])]))])[
 
 # Hijack the post prologue to insert early definition of YYLLOC_DEFAULT
 # and declaration of yyerror.
-m4_append([b4_post_prologue],
+]m4_append([b4_post_prologue],
 [b4_syncline([@oline@], [@ofile@])[
 ]b4_yylloc_default_define[
 #define YYRHSLOC(Rhs, K) ((Rhs)[K].yystate.yyloc)
@@ -98,10 +118,28 @@ m4_append([b4_post_prologue],
     [[const char* msg], [msg]])])
 
 
+#undef yynerrs
+#undef yychar
+#undef yylval]b4_locations_if([
+#undef yylloc])
+
+m4_if(b4_prefix, [yy], [],
+[[/* Substitute the variable and function names.  */
+#define yyparse ]b4_prefix[parse
+#define yylex   ]b4_prefix[lex
+#define yyerror ]b4_prefix[error
+#define yydebug ]b4_prefix[debug
+]]b4_pure_if([], [[
+#define yylval  ]b4_prefix[lval
+#define yychar  ]b4_prefix[char
+#define yynerrs ]b4_prefix[nerrs]b4_locations_if([[
+#define yylloc  ]b4_prefix[lloc]])]))
+
 # Hijack the epilogue to define implementations (yyerror, parser member
 # functions etc.).
 m4_append([b4_epilogue],
 [b4_syncline([@oline@], [@ofile@])[
+
 /*------------------.
 | Report an error.  |
 `------------------*/
@@ -212,23 +250,21 @@ b4_namespace_close
 # Declaration that might either go into the header (if --defines)
 # or open coded in the parser body.
 m4_define([b4_shared_declarations],
-[dnl In this section, the parse params are the original parse_params.
-m4_pushdef([b4_parse_param], m4_defn([b4_parse_param_orig]))dnl
+[m4_pushdef([b4_parse_param], m4_defn([b4_parse_param_orig]))dnl
 b4_percent_code_get([[requires]])[
 
+#include <cstdlib>  // abort
 #include <stdexcept>
 #include <string>
 #include <iostream>]b4_defines_if([
-b4_locations_if([b4_percent_define_ifdef([[location_type]], [],
-                                         [[#include "location.hh"]])])])[
+b4_bison_locations_if([[#include "location.hh"]])])[
 
 ]b4_YYDEBUG_define[
 
 ]b4_namespace_open[
 ]b4_defines_if([],
-[b4_locations_if([b4_percent_define_ifdef([[location_type]], [],
-                                          [b4_position_define
-b4_location_define])])])[
+[b4_bison_locations_if([b4_position_define
+b4_location_define])])[
 
   /// A Bison parser.
   class ]b4_parser_class_name[
@@ -279,7 +315,7 @@ b4_location_define])])])[
                                    const semantic_type* yyvaluep]b4_locations_if([[,
                                    const location_type* yylocationp]])[);
   private:
-    /* Debugging.  */
+    // Debugging.
     std::ostream* yycdebug_;
 #endif
 
@@ -303,28 +339,19 @@ b4_percent_define_flag_if([[global_tokens_and_yystype]],
 ])
 
 b4_defines_if(
-[m4_changecom()dnl
-m4_divert_push(0)dnl
-@output(b4_spec_defines_file@)@
+[b4_output_begin([b4_spec_defines_file])
 b4_copyright([Skeleton interface for Bison GLR parsers in C++],
              [2002-2012])[
 
-/* C++ GLR parser skeleton written by Akim Demaille.  */
+// C++ GLR parser skeleton written by Akim Demaille.
 
 ]b4_cpp_guard_open([b4_spec_defines_file])[
 ]b4_shared_declarations[
 ]b4_cpp_guard_close([b4_spec_defines_file])[
-]m4_divert_pop(0)
-m4_changecom[#])])
+]b4_output_end()])
 
 # Let glr.c (and b4_shared_declarations) believe that the user
 # arguments include the parser itself.
-m4_ifset([b4_parse_param],
-[m4_pushdef([b4_parse_param],
-            [[b4_namespace_ref::b4_parser_class_name[& yyparser], [[yyparser]]],]
-m4_defn([b4_parse_param]))],
-[m4_pushdef([b4_parse_param],
-            [[b4_namespace_ref::b4_parser_class_name[& yyparser], [[yyparser]]]])
-])
+m4_pushdef([b4_parse_param], m4_defn([b4_parse_param_wrap]))
 m4_include(b4_pkgdatadir/[glr.c])
 m4_popdef([b4_parse_param])