yacc.c: initialize yylval and yylloc.

[bison.git] / src / parse-gram.y

diff --git a/src/parse-gram.y b/src/parse-gram.y
index f45873513b967b455baf71f18432fce9577c1809..5f77a5bd08abd0355531dadbbebe53503442c77a 100644 (file)
--- a/src/parse-gram.y
+++ b/src/parse-gram.y
@@ -1,12 +1,12 @@
 %{/* Bison Grammar Parser                             -*- C -*-
 
 %{/* Bison Grammar Parser                             -*- C -*-
 

-   Copyright (C) 2002, 2003, 2004, 2005, 2006 Free Software Foundation, Inc.
+   Copyright (C) 2002-2012 Free Software Foundation, Inc.

 
    This file is part of Bison, the GNU Compiler Compiler.
 
 
    This file is part of Bison, the GNU Compiler Compiler.
 

-   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.
 
    This program is distributed in the hope that it will be useful,
    (at your option) any later version.
 
    This program is distributed in the hope that it will be useful,


@@ -15,31 +15,31 @@
    GNU General Public License for more details.
 
    You should have received a copy of the GNU General Public License
    GNU General Public License for more details.
 
    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/>.  */

 
 #include <config.h>
 #include "system.h"
 
 
 #include <config.h>
 #include "system.h"
 

+#include "c-ctype.h"

 #include "complain.h"
 #include "conflicts.h"
 #include "files.h"
 #include "getargs.h"
 #include "gram.h"
 #include "complain.h"
 #include "conflicts.h"
 #include "files.h"
 #include "getargs.h"
 #include "gram.h"

-#include "muscle_tab.h"
-#include "output.h"
+#include "muscle-tab.h"
+#include "named-ref.h"

 #include "quotearg.h"
 #include "reader.h"
 #include "symlist.h"
 #include "quotearg.h"
 #include "reader.h"
 #include "symlist.h"

-#include "strverscmp.h"
+#include "scan-gram.h"
+#include "scan-code.h"
+#include "xmemdup0.h"

 
 #define YYLLOC_DEFAULT(Current, Rhs, N)  (Current) = lloc_default (Rhs, N)
 static YYLTYPE lloc_default (YYLTYPE const *, int);
 
 #define YY_LOCATION_PRINT(File, Loc) \
 
 #define YYLLOC_DEFAULT(Current, Rhs, N)  (Current) = lloc_default (Rhs, N)
 static YYLTYPE lloc_default (YYLTYPE const *, int);
 
 #define YY_LOCATION_PRINT(File, Loc) \

-          location_print (File, Loc)
+         location_print (File, Loc)

 
 static void version_check (location const *loc, char const *version);
 
 
 static void version_check (location const *loc, char const *version);
 


@@ -47,45 +47,81 @@ static void version_check (location const *loc, char const *version);
    FIXME: depends on the undocumented availability of YYLLOC.  */
 #undef  yyerror
 #define yyerror(Msg) \
    FIXME: depends on the undocumented availability of YYLLOC.  */
 #undef  yyerror
 #define yyerror(Msg) \

-        gram_error (&yylloc, Msg)
+       gram_error (&yylloc, Msg)

 static void gram_error (location const *, char const *);
 
 static void gram_error (location const *, char const *);
 

-static void add_param (char const *, char *, location);
+static char const *char_name (char);
+
+/** Add a lex-param or a parse-param.
+ *
+ * \param type  \a lex_param or \a parse_param
+ * \param decl  the formal argument
+ * \param loc   the location in the source.
+ */
+static void add_param (char const *type, char *decl, location loc);
+

 
 static symbol_class current_class = unknown_sym;
 
 static symbol_class current_class = unknown_sym;

-static uniqstr current_type = 0;
-static symbol *current_lhs;
+static uniqstr current_type = NULL;
+static symbol *current_lhs_symbol;

 static location current_lhs_location;
 static location current_lhs_location;

+static named_ref *current_lhs_named_ref;

 static int current_prec = 0;
 static int current_prec = 0;

+
+/** Set the new current left-hand side symbol, possibly common
+ * to several right-hand side parts of rule.
+ */
+static
+void
+current_lhs(symbol *sym, location loc, named_ref *ref)
+{
+  current_lhs_symbol = sym;
+  current_lhs_location = loc;
+  /* In order to simplify memory management, named references for lhs
+     are always assigned by deep copy into the current symbol_list
+     node.  This is because a single named-ref in the grammar may
+     result in several uses when the user factors lhs between several
+     rules using "|".  Therefore free the parser's original copy.  */
+  free (current_lhs_named_ref);
+  current_lhs_named_ref = ref;
+}
+
+
+#define YYTYPE_INT16 int_fast16_t
+#define YYTYPE_INT8 int_fast8_t
+#define YYTYPE_UINT16 uint_fast16_t
+#define YYTYPE_UINT8 uint_fast8_t

 %}
 
 %debug
 %}
 
 %debug

-%verbose
+%define api.prefix "gram_"
+%define api.pure
+%define parse.lac full

 %defines
 %defines

-%locations
-%pure-parser

 %error-verbose
 %error-verbose

-%defines
-%name-prefix="gram_"
+%expect 0
+%locations
+%verbose

 
 %initial-action
 {
   /* Bison's grammar can initial empty locations, hence a default
      location is needed. */
 
 %initial-action
 {
   /* Bison's grammar can initial empty locations, hence a default
      location is needed. */

-  @$.start.file   = @$.end.file   = current_file;
-  @$.start.line   = @$.end.line   = 1;
-  @$.start.column = @$.end.column = 0;
+  boundary_set (&@$.start, current_file, 1, 1);
+  boundary_set (&@$.end, current_file, 1, 1);

 }
 
 }
 

-/* Only NUMBERS have a value.  */

 %union
 {
   symbol *symbol;
   symbol_list *list;
   int integer;
 %union
 {
   symbol *symbol;
   symbol_list *list;
   int integer;

-  char *chars;
+  char const *chars;
+  char *code;

   assoc assoc;
   uniqstr uniqstr;
   assoc assoc;
   uniqstr uniqstr;

+  unsigned char character;
+  named_ref *named_ref;

 };
 
 /* Define the tokens together with their human representation.  */
 };
 
 /* Define the tokens together with their human representation.  */


@@ -97,10 +133,8 @@ static int current_prec = 0;
 %token PERCENT_NTERM       "%nterm"
 
 %token PERCENT_TYPE        "%type"
 %token PERCENT_NTERM       "%nterm"
 
 %token PERCENT_TYPE        "%type"

-%token PERCENT_DESTRUCTOR  "%destructor {...}"
-%token PERCENT_PRINTER     "%printer {...}"
-
-%token PERCENT_UNION       "%union {...}"
+%token PERCENT_DESTRUCTOR  "%destructor"
+%token PERCENT_PRINTER     "%printer"

 
 %token PERCENT_LEFT        "%left"
 %token PERCENT_RIGHT       "%right"
 
 %token PERCENT_LEFT        "%left"
 %token PERCENT_RIGHT       "%right"


@@ -116,6 +150,7 @@ static int current_prec = 0;
 `----------------------*/
 
 %token
 `----------------------*/
 
 %token

+  PERCENT_CODE            "%code"

   PERCENT_DEBUG           "%debug"
   PERCENT_DEFAULT_PREC    "%default-prec"
   PERCENT_DEFINE          "%define"
   PERCENT_DEBUG           "%debug"
   PERCENT_DEFAULT_PREC    "%default-prec"
   PERCENT_DEFINE          "%define"


@@ -125,18 +160,19 @@ static int current_prec = 0;
   PERCENT_EXPECT_RR      "%expect-rr"
   PERCENT_FILE_PREFIX     "%file-prefix"
   PERCENT_GLR_PARSER      "%glr-parser"
   PERCENT_EXPECT_RR      "%expect-rr"
   PERCENT_FILE_PREFIX     "%file-prefix"
   PERCENT_GLR_PARSER      "%glr-parser"

-  PERCENT_INITIAL_ACTION  "%initial-action {...}"
-  PERCENT_LEX_PARAM       "%lex-param {...}"
+  PERCENT_INITIAL_ACTION  "%initial-action"
+  PERCENT_LANGUAGE        "%language"
+  PERCENT_LEX_PARAM       "%lex-param"

   PERCENT_LOCATIONS       "%locations"
   PERCENT_NAME_PREFIX     "%name-prefix"
   PERCENT_NO_DEFAULT_PREC "%no-default-prec"
   PERCENT_NO_LINES        "%no-lines"
   PERCENT_NONDETERMINISTIC_PARSER
   PERCENT_LOCATIONS       "%locations"
   PERCENT_NAME_PREFIX     "%name-prefix"
   PERCENT_NO_DEFAULT_PREC "%no-default-prec"
   PERCENT_NO_LINES        "%no-lines"
   PERCENT_NONDETERMINISTIC_PARSER

-                          "%nondeterministic-parser"
+                         "%nondeterministic-parser"

   PERCENT_OUTPUT          "%output"
   PERCENT_OUTPUT          "%output"

-  PERCENT_PARSE_PARAM     "%parse-param {...}"
+  PERCENT_PARSE_PARAM     "%parse-param"

   PERCENT_PURE_PARSER     "%pure-parser"
   PERCENT_PURE_PARSER     "%pure-parser"

-  PERCENT_REQUIRE        "%require"
+  PERCENT_REQUIRE        "%require"

   PERCENT_SKELETON        "%skeleton"
   PERCENT_START           "%start"
   PERCENT_TOKEN_TABLE     "%token-table"
   PERCENT_SKELETON        "%skeleton"
   PERCENT_START           "%start"
   PERCENT_TOKEN_TABLE     "%token-table"


@@ -144,52 +180,54 @@ static int current_prec = 0;
   PERCENT_YACC            "%yacc"
 ;
 
   PERCENT_YACC            "%yacc"
 ;
 

-%token TYPE            "type"
+%token BRACED_CODE     "{...}"
+%token BRACKETED_ID    "[identifier]"
+%token CHAR            "char"
+%token EPILOGUE        "epilogue"

 %token EQUAL           "="
 %token EQUAL           "="

-%token SEMICOLON       ";"
-%token PIPE            "|"

 %token ID              "identifier"
 %token ID_COLON        "identifier:"
 %token PERCENT_PERCENT "%%"
 %token ID              "identifier"
 %token ID_COLON        "identifier:"
 %token PERCENT_PERCENT "%%"

+%token PIPE            "|"

 %token PROLOGUE        "%{...%}"
 %token PROLOGUE        "%{...%}"

-%token EPILOGUE        "epilogue"
-%token BRACED_CODE     "{...}"
-
-
-%type <chars> STRING string_content
-             "%destructor {...}"
-             "%initial-action {...}"
-             "%lex-param {...}"
-             "%parse-param {...}"
-             "%printer {...}"
-             "%union {...}"
-             BRACED_CODE action
-             PROLOGUE EPILOGUE
-%printer { fprintf (stderr, "\"%s\"", $$); }
-              STRING string_content
+%token SEMICOLON       ";"
+%token TYPE            "type"
+%token TYPE_TAG_ANY    "<*>"
+%token TYPE_TAG_NONE   "<>"
+
+%type <character> CHAR
+%printer { fputs (char_name ($$), stderr); } CHAR
+
+/* braceless is not to be used for rule or symbol actions, as it
+   calls code_props_plain_init.  */
+%type <chars> STRING "%{...%}" EPILOGUE braceless content.opt
+%type <code> "{...}"
+%printer { fputs (quotearg_style (c_quoting_style, $$), stderr); }
+        STRING

 %printer { fprintf (stderr, "{\n%s\n}", $$); }
 %printer { fprintf (stderr, "{\n%s\n}", $$); }

-             "%destructor {...}"
-             "%initial-action {...}"
-             "%lex-param {...}"
-             "%parse-param {...}"
-             "%printer {...}"
-             "%union {...}"
-             BRACED_CODE action
-             PROLOGUE EPILOGUE
-%type <uniqstr> TYPE
+        braceless content.opt "{...}" "%{...%}" EPILOGUE
+
+%type <uniqstr> BRACKETED_ID ID ID_COLON TYPE variable
+%printer { fputs ($$, stderr); } <uniqstr>
+%printer { fprintf (stderr, "[%s]", $$); } BRACKETED_ID
+%printer { fprintf (stderr, "%s:", $$); } ID_COLON

 %printer { fprintf (stderr, "<%s>", $$); } TYPE
 %printer { fprintf (stderr, "<%s>", $$); } TYPE

+

 %type <integer> INT
 %type <integer> INT

-%printer { fprintf (stderr, "%d", $$); } INT
-%type <symbol> ID symbol string_as_id
-%printer { fprintf (stderr, "%s", $$->tag); } ID symbol string_as_id
-%type <symbol> ID_COLON
-%printer { fprintf (stderr, "%s:", $$->tag); } ID_COLON
+%printer { fprintf (stderr, "%d", $$); } <integer>
+
+%type <symbol> id id_colon string_as_id symbol symbol.prec
+%printer { fprintf (stderr, "%s", $$->tag); } <symbol>
+%printer { fprintf (stderr, "%s:", $$->tag); } id_colon
+

 %type <assoc> precedence_declarator
 %type <assoc> precedence_declarator

-%type <list>  symbols.1
+%type <list>  symbols.1 symbols.prec generic_symlist generic_symlist_item
+%type <named_ref> named_ref.opt
+

 %%
 
 input:
 %%
 
 input:

-  declarations "%%" grammar epilogue.opt
+  prologue_declarations "%%" grammar epilogue.opt

 ;
 
 
 ;
 
 


@@ -197,48 +235,107 @@ input:
        | Declarations: before the first %%.  |
        `------------------------------------*/
 
        | Declarations: before the first %%.  |
        `------------------------------------*/
 

-declarations:
+prologue_declarations:

   /* Nothing */
   /* Nothing */

-| declarations declaration
+| prologue_declarations prologue_declaration

 ;
 
 ;
 

-declaration:
+prologue_declaration:

   grammar_declaration
   grammar_declaration

-| PROLOGUE                                 { prologue_augment ($1, @1); }
-| "%debug"                                 { debug_flag = true; }
-| "%define" string_content
+| "%{...%}"
+    {
+      code_props plain_code;
+      code_props_plain_init (&plain_code, $1, @1);
+      code_props_translate_code (&plain_code);
+      gram_scanner_last_string_free ();
+      muscle_code_grow (union_seen ? "post_prologue" : "pre_prologue",
+                        plain_code.code, @1);
+      code_scanner_last_string_free ();
+    }
+| "%debug"                         { debug = true; }
+| "%define" variable content.opt

     {
     {

-      static char one[] = "1";
-      muscle_insert ($2, one);
+      muscle_percent_define_insert ($2, @2, $3,
+                                    MUSCLE_PERCENT_DEFINE_GRAMMAR_FILE);

     }
     }

-| "%define" string_content string_content  { muscle_insert ($2, $3); }
-| "%defines"                               { defines_flag = true; }
-| "%error-verbose"                         { error_verbose = true; }
-| "%expect" INT                            { expected_sr_conflicts = $2; }
-| "%expect-rr" INT                        { expected_rr_conflicts = $2; }
-| "%file-prefix" "=" string_content        { spec_file_prefix = $3; }
+| "%defines"                       { defines_flag = true; }
+| "%defines" STRING
+    {
+      defines_flag = true;
+      spec_defines_file = xstrdup ($2);
+    }
+| "%error-verbose"                 { error_verbose = true; }
+| "%expect" INT                    { expected_sr_conflicts = $2; }
+| "%expect-rr" INT                { expected_rr_conflicts = $2; }
+| "%file-prefix" STRING            { spec_file_prefix = $2; }
+| "%file-prefix" "=" STRING        { spec_file_prefix = $3; } /* deprecated */

 | "%glr-parser"
     {
       nondeterministic_parser = true;
       glr_parser = true;
     }
 | "%glr-parser"
     {
       nondeterministic_parser = true;
       glr_parser = true;
     }

-| "%initial-action {...}"
+| "%initial-action" "{...}"
+    {
+      code_props action;
+      code_props_symbol_action_init (&action, $2, @2);
+      code_props_translate_code (&action);
+      gram_scanner_last_string_free ();
+      muscle_code_grow ("initial_action", action.code, @2);
+      code_scanner_last_string_free ();
+    }
+| "%language" STRING           { language_argmatch ($2, grammar_prio, @1); }
+| "%lex-param" "{...}"         { add_param ("lex_param", $2, @2); }
+| "%locations"                  { locations_flag = true; }
+| "%name-prefix" STRING         { spec_name_prefix = $2; }
+| "%name-prefix" "=" STRING     { spec_name_prefix = $3; } /* deprecated */
+| "%no-lines"                   { no_lines_flag = true; }
+| "%nondeterministic-parser"   { nondeterministic_parser = true; }
+| "%output" STRING              { spec_outfile = $2; }
+| "%output" "=" STRING          { spec_outfile = $3; }  /* deprecated */
+| "%parse-param" "{...}"       { add_param ("parse_param", $2, @2); }
+| "%pure-parser"
+    {
+      /* %pure-parser is deprecated in favor of `%define api.pure', so use
+         `%define api.pure' in a backward-compatible manner here.  First, don't
+         complain if %pure-parser is specified multiple times.  */
+      if (!muscle_find_const ("percent_define(api.pure)"))
+        muscle_percent_define_insert ("api.pure", @1, "",
+                                      MUSCLE_PERCENT_DEFINE_GRAMMAR_FILE);
+      /* In all cases, use api.pure now so that the backend doesn't complain if
+         the skeleton ignores api.pure, but do warn now if there's a previous
+         conflicting definition from an actual %define.  */
+      if (!muscle_percent_define_flag_if ("api.pure"))
+        muscle_percent_define_insert ("api.pure", @1, "",
+                                      MUSCLE_PERCENT_DEFINE_GRAMMAR_FILE);
+    }
+| "%require" STRING             { version_check (&@2, $2); }
+| "%skeleton" STRING

     {
     {

-      muscle_code_grow ("initial_action", $1, @1);
+      char const *skeleton_user = $2;
+      if (mbschr (skeleton_user, '/'))
+        {
+          size_t dir_length = strlen (current_file);
+          char *skeleton_build;
+          while (dir_length && current_file[dir_length - 1] != '/')
+            --dir_length;
+          while (dir_length && current_file[dir_length - 1] == '/')
+            --dir_length;
+          skeleton_build =
+            xmalloc (dir_length + 1 + strlen (skeleton_user) + 1);
+          if (dir_length > 0)
+            {
+              memcpy (skeleton_build, current_file, dir_length);
+              skeleton_build[dir_length++] = '/';
+            }
+          strcpy (skeleton_build + dir_length, skeleton_user);
+          skeleton_user = uniqstr_new (skeleton_build);
+          free (skeleton_build);
+        }
+      skeleton_arg (skeleton_user, grammar_prio, @1);

     }
     }

-| "%lex-param {...}"                      { add_param ("lex_param", $1, @1); }
-| "%locations"                             { locations_flag = true; }
-| "%name-prefix" "=" string_content        { spec_name_prefix = $3; }
-| "%no-lines"                              { no_lines_flag = true; }
-| "%nondeterministic-parser"              { nondeterministic_parser = true; }
-| "%output" "=" string_content             { spec_outfile = $3; }
-| "%parse-param {...}"                    { add_param ("parse_param", $1, @1); }
-| "%pure-parser"                           { pure_parser = true; }
-| "%require" string_content                { version_check (&@2, $2); }
-| "%skeleton" string_content               { skeleton = $2; }
-| "%token-table"                           { token_table_flag = true; }
-| "%verbose"                               { report_flag = report_states; }
-| "%yacc"                                  { yacc_flag = true; }
+| "%token-table"                { token_table_flag = true; }
+| "%verbose"                    { report_flag |= report_states; }
+| "%yacc"                       { yacc_flag = true; }

 | /*FIXME: Err?  What is this horror doing here? */ ";"
 ;
 
 | /*FIXME: Err?  What is this horror doing here? */ ";"
 ;
 


@@ -249,35 +346,29 @@ grammar_declaration:
     {
       grammar_start_symbol_set ($2, @2);
     }
     {
       grammar_start_symbol_set ($2, @2);
     }

-| "%union {...}"
-    {
-      char const *body = $1;
-
-      if (typed)
-       {
-         /* Concatenate the union bodies, turning the first one's
-            trailing '}' into '\n', and omitting the second one's '{'.  */
-         char *code = muscle_find ("stype");
-         code[strlen (code) - 1] = '\n';
-         body++;
-       }
-
-      typed = true;
-      muscle_code_grow ("stype", body, @1);
-    }
-| "%destructor {...}" symbols.1
+| "%destructor" "{...}" generic_symlist

     {
     {

-      symbol_list *list;
-      for (list = $2; list; list = list->next)
-       symbol_destructor_set (list->sym, $1, @1);
-      symbol_list_free ($2);
+      code_props code;
+      code_props_symbol_action_init (&code, $2, @2);
+      code_props_translate_code (&code);
+      {
+        symbol_list *list;
+        for (list = $3; list; list = list->next)
+          symbol_list_destructor_set (list, &code);
+        symbol_list_free ($3);
+      }

     }
     }

-| "%printer {...}" symbols.1
+| "%printer" "{...}" generic_symlist

     {
     {

-      symbol_list *list;
-      for (list = $2; list; list = list->next)
-       symbol_printer_set (list->sym, $1, list->location);
-      symbol_list_free ($2);
+      code_props code;
+      code_props_symbol_action_init (&code, $2, @2);
+      code_props_translate_code (&code);
+      {
+        symbol_list *list;
+        for (list = $3; list; list = list->next)
+          symbol_list_printer_set (list, &code);
+        symbol_list_free ($3);
+      }

     }
 | "%default-prec"
     {
     }
 | "%default-prec"
     {


@@ -287,8 +378,44 @@ grammar_declaration:
     {
       default_prec = false;
     }
     {
       default_prec = false;
     }

+| "%code" braceless
+    {
+      /* Do not invoke muscle_percent_code_grow here since it invokes
+         muscle_user_name_list_grow.  */
+      muscle_code_grow ("percent_code()", $2, @2);
+      code_scanner_last_string_free ();
+    }
+| "%code" ID braceless
+    {
+      muscle_percent_code_grow ($2, @2, $3, @3);
+      code_scanner_last_string_free ();
+    }

 ;
 
 ;
 

+
+/*----------*
+ | %union.  |
+ *----------*/
+
+%token PERCENT_UNION "%union";
+
+union_name:
+  /* Nothing. */ {}
+| ID             { muscle_code_grow ("union_name", $1, @1); }
+;
+
+grammar_declaration:
+  "%union" union_name braceless
+    {
+      union_seen = true;
+      muscle_code_grow ("stype", $3, @3);
+      code_scanner_last_string_free ();
+    }
+;
+
+
+
+

 symbol_declaration:
   "%nterm" { current_class = nterm_sym; } symbol_defs.1
     {
 symbol_declaration:
   "%nterm" { current_class = nterm_sym; } symbol_defs.1
     {


@@ -303,21 +430,22 @@ symbol_declaration:
 | "%type" TYPE symbols.1
     {
       symbol_list *list;
 | "%type" TYPE symbols.1
     {
       symbol_list *list;

+      tag_seen = true;

       for (list = $3; list; list = list->next)
       for (list = $3; list; list = list->next)

-       symbol_type_set (list->sym, $2, @2);
+       symbol_type_set (list->content.sym, $2, @2);

       symbol_list_free ($3);
     }
 ;
 
 precedence_declaration:
       symbol_list_free ($3);
     }
 ;
 
 precedence_declaration:

-  precedence_declarator type.opt symbols.1
+  precedence_declarator type.opt symbols.prec

     {
       symbol_list *list;
       ++current_prec;
       for (list = $3; list; list = list->next)
        {
     {
       symbol_list *list;
       ++current_prec;
       for (list = $3; list; list = list->next)
        {

-         symbol_type_set (list->sym, current_type, @2);
-         symbol_precedence_set (list->sym, current_prec, $1, @1);
+         symbol_type_set (list->content.sym, current_type, @2);
+         symbol_precedence_set (list->content.sym, current_prec, $1, @1);

        }
       symbol_list_free ($3);
       current_type = NULL;
        }
       symbol_list_free ($3);
       current_type = NULL;


@@ -332,14 +460,40 @@ precedence_declarator:
 
 type.opt:
   /* Nothing. */ { current_type = NULL; }
 
 type.opt:
   /* Nothing. */ { current_type = NULL; }

-| TYPE           { current_type = $1; }
+| TYPE           { current_type = $1; tag_seen = true; }

 ;
 
 ;
 

-/* One or more nonterminals to be %typed. */
+/* Just like symbols.1 but accept INT for the sake of POSIX.  */
+symbols.prec:
+  symbol.prec
+    { $$ = symbol_list_sym_new ($1, @1); }
+| symbols.prec symbol.prec
+    { $$ = symbol_list_prepend ($1, symbol_list_sym_new ($2, @2)); }
+;
+
+symbol.prec:
+    symbol { $$ = $1; }
+  | symbol INT { $$ = $1; symbol_user_token_number_set ($1, $2, @2); }
+  ;

 
 

+/* One or more symbols to be %typed. */

 symbols.1:
 symbols.1:

-  symbol            { $$ = symbol_list_new ($1, @1); }
-| symbols.1 symbol  { $$ = symbol_list_prepend ($1, $2, @2); }
+  symbol
+    { $$ = symbol_list_sym_new ($1, @1); }
+| symbols.1 symbol
+    { $$ = symbol_list_prepend ($1, symbol_list_sym_new ($2, @2)); }
+;
+
+generic_symlist:
+  generic_symlist_item { $$ = $1; }
+| generic_symlist generic_symlist_item { $$ = symbol_list_prepend ($1, $2); }
+;
+
+generic_symlist_item:
+  symbol            { $$ = symbol_list_sym_new ($1, @1); }
+| TYPE              { $$ = symbol_list_type_new ($1, @1); }
+| "<*>"             { $$ = symbol_list_default_tagged_new (@1); }
+| "<>"             { $$ = symbol_list_default_tagless_new (@1); }

 ;
 
 /* One token definition.  */
 ;
 
 /* One token definition.  */


@@ -347,25 +501,26 @@ symbol_def:
   TYPE
      {
        current_type = $1;
   TYPE
      {
        current_type = $1;

+       tag_seen = true;

      }
      }

-| ID
+| id

      {
        symbol_class_set ($1, current_class, @1, true);
        symbol_type_set ($1, current_type, @1);
      }
      {
        symbol_class_set ($1, current_class, @1, true);
        symbol_type_set ($1, current_type, @1);
      }

-| ID INT
+| id INT

     {
       symbol_class_set ($1, current_class, @1, true);
       symbol_type_set ($1, current_type, @1);
       symbol_user_token_number_set ($1, $2, @2);
     }
     {
       symbol_class_set ($1, current_class, @1, true);
       symbol_type_set ($1, current_type, @1);
       symbol_user_token_number_set ($1, $2, @2);
     }

-| ID string_as_id
+| id string_as_id

     {
       symbol_class_set ($1, current_class, @1, true);
       symbol_type_set ($1, current_type, @1);
       symbol_make_alias ($1, $2, @$);
     }
     {
       symbol_class_set ($1, current_class, @1, true);
       symbol_type_set ($1, current_type, @1);
       symbol_make_alias ($1, $2, @$);
     }

-| ID INT string_as_id
+| id INT string_as_id

     {
       symbol_class_set ($1, current_class, @1, true);
       symbol_type_set ($1, current_type, @1);
     {
       symbol_class_set ($1, current_class, @1, true);
       symbol_type_set ($1, current_type, @1);


@@ -402,7 +557,11 @@ rules_or_grammar_declaration:
 ;
 
 rules:
 ;
 
 rules:

-  ID_COLON { current_lhs = $1; current_lhs_location = @1; } rhses.1
+  id_colon named_ref.opt { current_lhs ($1, @1, $2); } rhses.1
+  {
+    /* Free the current lhs. */
+    current_lhs (0, @1, 0);
+  }

 ;
 
 rhses.1:
 ;
 
 rhses.1:


@@ -413,11 +572,12 @@ rhses.1:
 
 rhs:
   /* Nothing.  */
 
 rhs:
   /* Nothing.  */

-    { grammar_current_rule_begin (current_lhs, current_lhs_location); }
-| rhs symbol
-    { grammar_current_rule_symbol_append ($2, @2); }
-| rhs action
-    { grammar_current_rule_action_append ($2, @2); }
+    { grammar_current_rule_begin (current_lhs_symbol, current_lhs_location,
+                                 current_lhs_named_ref); }
+| rhs symbol named_ref.opt
+    { grammar_current_rule_symbol_append ($2, @2, $3); }
+| rhs "{...}" named_ref.opt
+    { grammar_current_rule_action_append ($2, @2, $3); }

 | rhs "%prec" symbol
     { grammar_current_rule_prec_set ($3, @3); }
 | rhs "%dprec" INT
 | rhs "%prec" symbol
     { grammar_current_rule_prec_set ($3, @3); }
 | rhs "%dprec" INT


@@ -426,14 +586,75 @@ rhs:
     { grammar_current_rule_merge_set ($3, @3); }
 ;
 
     { grammar_current_rule_merge_set ($3, @3); }
 ;
 

-symbol:
-  ID              { $$ = $1; }
-| string_as_id    { $$ = $1; }
+named_ref.opt:
+  /* Nothing. */ { $$ = 0; }
+|
+  BRACKETED_ID   { $$ = named_ref_new($1, @1); }
+;
+
+
+/*----------------------------*
+ | variable and content.opt.  |
+ *---------------------------*/
+
+/* The STRING form of variable is deprecated and is not M4-friendly.
+   For example, M4 fails for `%define "[" "value"'.  */
+variable:
+  ID
+| STRING { $$ = uniqstr_new ($1); }
+;
+
+/* Some content or empty by default. */
+content.opt:
+  /* Nothing. */   { $$ = ""; }
+| ID { $$ = $1; }
+| STRING

 ;
 
 ;
 

-action:
-  BRACED_CODE
-    { $$ = $1; }
+
+/*-------------*
+ | braceless.  |
+ *-------------*/
+
+braceless:
+  "{...}"
+    {
+      code_props plain_code;
+      $1[strlen ($1) - 1] = '\n';
+      code_props_plain_init (&plain_code, $1+1, @1);
+      code_props_translate_code (&plain_code);
+      gram_scanner_last_string_free ();
+      $$ = plain_code.code;
+    }
+;
+
+
+/*---------------*
+ | Identifiers.  |
+ *---------------*/
+
+/* Identifiers are returned as uniqstr values by the scanner.
+   Depending on their use, we may need to make them genuine symbols.  */
+
+id:
+  ID
+    { $$ = symbol_from_uniqstr ($1, @1); }
+| CHAR
+    {
+      $$ = symbol_get (char_name ($1), @1);
+      symbol_class_set ($$, token_sym, @1, false);
+      symbol_user_token_number_set ($$, $1, @1);
+    }
+;
+
+id_colon:
+  ID_COLON { $$ = symbol_from_uniqstr ($1, @1); }
+;
+
+
+symbol:
+  id
+| string_as_id

 ;
 
 /* A string used as an ID: quote it.  */
 ;
 
 /* A string used as an ID: quote it.  */


@@ -445,19 +666,16 @@ string_as_id:
     }
 ;
 
     }
 ;
 

-/* A string used for its contents.  Don't quote it.  */
-string_content:
-  STRING
-    { $$ = $1; }
-;
-
-

 epilogue.opt:
   /* Nothing.  */
 | "%%" EPILOGUE
     {
 epilogue.opt:
   /* Nothing.  */
 | "%%" EPILOGUE
     {

-      muscle_code_grow ("epilogue", $2, @2);
-      scanner_last_string_free ();
+      code_props plain_code;
+      code_props_plain_init (&plain_code, $2, @2);
+      code_props_translate_code (&plain_code);
+      gram_scanner_last_string_free ();
+      muscle_code_grow ("epilogue", plain_code.code, @2);
+      code_scanner_last_string_free ();

     }
 ;
 
     }
 ;
 


@@ -480,7 +698,7 @@ lloc_default (YYLTYPE const *rhs, int n)
   loc.start = rhs[n].end;
   loc.end = rhs[n].end;
 
   loc.start = rhs[n].end;
   loc.end = rhs[n].end;
 

-  /* Ignore empty nonterminals the start of the the right-hand side.
+  /* Ignore empty nonterminals the start of the right-hand side.

      Do not bother to ignore them at the end of the right-hand side,
      since empty nonterminals have the same end as their predecessors.  */
   for (i = 1; i <= n; i++)
      Do not bother to ignore them at the end of the right-hand side,
      since empty nonterminals have the same end as their predecessors.  */
   for (i = 1; i <= n; i++)


@@ -517,42 +735,35 @@ add_param (char const *type, char *decl, location loc)
 
   /* Strip the surrounding '{' and '}', and any blanks just inside
      the braces.  */
 
   /* Strip the surrounding '{' and '}', and any blanks just inside
      the braces.  */

-  while (*--p == ' ' || *p == '\t')
-    continue;
+  --p;
+  while (c_isspace ((unsigned char) *p))
+    --p;

   p[1] = '\0';
   p[1] = '\0';

-  while (*++decl == ' ' || *decl == '\t')
-    continue;
+  ++decl;
+  while (c_isspace ((unsigned char) *decl))
+    ++decl;

 
   if (! name_start)
     complain_at (loc, _("missing identifier in parameter declaration"));
   else
     {
 
   if (! name_start)
     complain_at (loc, _("missing identifier in parameter declaration"));
   else
     {

-      char *name;
-      size_t name_len;
-
-      for (name_len = 1;
-          memchr (alphanum, name_start[name_len], sizeof alphanum);
-          name_len++)
-       continue;
-
-      name = xmalloc (name_len + 1);
-      memcpy (name, name_start, name_len);
-      name[name_len] = '\0';
+      char *name = xmemdup0 (name_start, strspn (name_start, alphanum));

       muscle_pair_list_grow (type, decl, name);
       free (name);
     }
 
       muscle_pair_list_grow (type, decl, name);
       free (name);
     }
 

-  scanner_last_string_free ();
+  gram_scanner_last_string_free ();

 }
 
 }
 

+

 static void
 version_check (location const *loc, char const *version)
 {
   if (strverscmp (version, PACKAGE_VERSION) > 0)
     {
       complain_at (*loc, "require bison %s, but have %s",
 static void
 version_check (location const *loc, char const *version)
 {
   if (strverscmp (version, PACKAGE_VERSION) > 0)
     {
       complain_at (*loc, "require bison %s, but have %s",

-                  version, PACKAGE_VERSION);
-      exit (63);
+                   version, PACKAGE_VERSION);
+      exit (EX_MISMATCH);

     }
 }
 
     }
 }
 


@@ -567,3 +778,16 @@ token_name (int type)
 {
   return yytname[YYTRANSLATE (type)];
 }
 {
   return yytname[YYTRANSLATE (type)];
 }

+
+static char const *
+char_name (char c)
+{
+  if (c == '\'')
+    return "'\\''";
+  else
+    {
+      char buf[4];
+      buf[0] = '\''; buf[1] = c; buf[2] = '\''; buf[3] = '\0';
+      return quotearg_style (escape_quoting_style, buf);
+    }
+}