X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/8f3596a6337cf30a3641967d450d1c9d77861edc..e0c653e7e660c353c59b054de571474450aa4c92:/src/parse-gram.y

diff --git a/src/parse-gram.y b/src/parse-gram.y
index db63e508..cada04f7 100644
--- a/src/parse-gram.y
+++ b/src/parse-gram.y
@@ -1,12 +1,13 @@
 %{/* Bison Grammar Parser                             -*- C -*-
 
-   Copyright (C) 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
+   Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008 Free Software
+   Foundation, Inc.
 
    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
-   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,
@@ -15,10 +16,7 @@
    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"
@@ -29,17 +27,17 @@
 #include "getargs.h"
 #include "gram.h"
 #include "muscle_tab.h"
-#include "output.h"
 #include "quotearg.h"
 #include "reader.h"
 #include "symlist.h"
-#include "strverscmp.h"
+#include "scan-gram.h"
+#include "scan-code.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) \
-          location_print (File, Loc)
+	  location_print (File, Loc)
 
 static void version_check (location const *loc, char const *version);
 
@@ -47,16 +45,30 @@ static void version_check (location const *loc, char const *version);
    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 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 uniqstr current_type = 0;
+static uniqstr current_type = NULL;
 static symbol *current_lhs;
 static location current_lhs_location;
 static int current_prec = 0;
+
+#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
@@ -65,27 +77,27 @@ static int current_prec = 0;
 %locations
 %pure-parser
 %error-verbose
-%defines
 %name-prefix="gram_"
+%expect 0
 
 %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;
-  char *chars;
+  char const *chars;
+  char *code;
   assoc assoc;
   uniqstr uniqstr;
+  unsigned char character;
 };
 
 /* Define the tokens together with their human representation.  */
@@ -97,14 +109,13 @@ static int current_prec = 0;
 %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_NONASSOC    "%nonassoc"
+%token PERCENT_PRECEDENCE  "%precedence"
 
 %token PERCENT_PREC          "%prec"
 %token PERCENT_DPREC         "%dprec"
@@ -116,6 +127,7 @@ static int current_prec = 0;
 `----------------------*/
 
 %token
+  PERCENT_CODE            "%code"
   PERCENT_DEBUG           "%debug"
   PERCENT_DEFAULT_PREC    "%default-prec"
   PERCENT_DEFINE          "%define"
@@ -125,18 +137,19 @@ static int current_prec = 0;
   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
-                          "%nondeterministic-parser"
+			  "%nondeterministic-parser"
   PERCENT_OUTPUT          "%output"
-  PERCENT_PARSE_PARAM     "%parse-param {...}"
+  PERCENT_PARSE_PARAM     "%parse-param"
   PERCENT_PURE_PARSER     "%pure-parser"
-  PERCENT_REQUIRE 	  "%require"
+  PERCENT_REQUIRE	  "%require"
   PERCENT_SKELETON        "%skeleton"
   PERCENT_START           "%start"
   PERCENT_TOKEN_TABLE     "%token-table"
@@ -144,52 +157,50 @@ static int current_prec = 0;
   PERCENT_YACC            "%yacc"
 ;
 
-%token TYPE            "type"
+%token BRACED_CODE     "{...}"
+%token CHAR            "char"
+%token EPILOGUE        "epilogue"
 %token EQUAL           "="
-%token SEMICOLON       ";"
-%token PIPE            "|"
 %token ID              "identifier"
 %token ID_COLON        "identifier:"
 %token PERCENT_PERCENT "%%"
+%token PIPE            "|"
 %token PROLOGUE        "%{...%}"
-%token EPILOGUE        "epilogue"
-%token BRACED_CODE     "{...}"
+%token SEMICOLON       ";"
+%token TAG             "<tag>"
+%token TAG_ANY         "<*>"
+%token 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}", $$); }
+	 braceless content.opt "{...}" "%{...%}" EPILOGUE
 
+%type <uniqstr> TAG ID ID_COLON variable
+%printer { fprintf (stderr, "<%s>", $$); } TAG
+%printer { fputs ($$, stderr); } ID variable
+%printer { fprintf (stderr, "%s:", $$); } ID_COLON
 
-%type <chars> STRING string_content
-	      "%destructor {...}"
-	      "%initial-action {...}"
-	      "%lex-param {...}"
-	      "%parse-param {...}"
-	      "%printer {...}"
-	      "%union {...}"
-	      BRACED_CODE action
-	      PROLOGUE EPILOGUE
-%printer { fprintf (stderr, "\"%s\"", $$); }
-              STRING string_content
-%printer { fprintf (stderr, "{\n%s\n}", $$); }
-	      "%destructor {...}"
-	      "%initial-action {...}"
-	      "%lex-param {...}"
-	      "%parse-param {...}"
-	      "%printer {...}"
-	      "%union {...}"
-	      BRACED_CODE action
-	      PROLOGUE EPILOGUE
-%type <uniqstr> TYPE
-%printer { fprintf (stderr, "<%s>", $$); } TYPE
 %type <integer> INT
 %printer { fprintf (stderr, "%d", $$); } 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
+
+%type <symbol> id id_colon symbol symbol.prec string_as_id
+%printer { fprintf (stderr, "%s", $$->tag); } id symbol string_as_id
+%printer { fprintf (stderr, "%s:", $$->tag); } id_colon
+
 %type <assoc> precedence_declarator
-%type <list>  symbols.1
+%type <list>  symbols.1 symbols.prec generic_symlist generic_symlist_item
 %%
 
 input:
-  declarations "%%" grammar epilogue.opt
+  prologue_declarations "%%" grammar epilogue.opt
 ;
 
 
@@ -197,44 +208,104 @@ input:
 	| Declarations: before the first %%.  |
 	`------------------------------------*/
 
-declarations:
+prologue_declarations:
   /* Nothing */
-| declarations declaration
+| prologue_declarations prologue_declaration
 ;
 
-declaration:
+prologue_declaration:
   grammar_declaration
-| PROLOGUE                                 { prologue_augment ($1, @1); }
-| "%debug"                                 { debug_flag = true; }
-| "%define" string_content                 { muscle_insert ($2, "1"); }
-| "%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; }
+| "%{...%}"
+    {
+      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_flag = true; }
+| "%define" variable content.opt
+    {
+      muscle_percent_define_insert ($2, @2, $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;
-  }
-| "%initial-action {...}"
-  {
-    muscle_code_grow ("initial_action", $1, @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; }
+    {
+      nondeterministic_parser = true;
+      glr_parser = true;
+    }
+| "%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, "");
+      /* 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, "");
+    }
+| "%require" STRING             { version_check (&@2, $2); }
+| "%skeleton" STRING
+    {
+      char const *skeleton_user = $2;
+      if (strchr (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)
+            {
+              strncpy (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);
+    }
+| "%token-table"                { token_table_flag = true; }
+| "%verbose"                    { report_flag |= report_states; }
+| "%yacc"                       { yacc_flag = true; }
 | /*FIXME: Err?  What is this horror doing here? */ ";"
 ;
 
@@ -245,25 +316,19 @@ grammar_declaration:
     {
       grammar_start_symbol_set ($2, @2);
     }
-| "%union {...}"
-    {
-      typed = true;
-      MUSCLE_INSERT_INT ("stype_line", @1.start.line);
-      muscle_insert ("stype", $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);
+      for (list = $3; list; list = list->next)
+	symbol_list_destructor_set (list, $2, @2);
+      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);
+      for (list = $3; list; list = list->next)
+	symbol_list_printer_set (list, $2, @2);
+      symbol_list_free ($3);
     }
 | "%default-prec"
     {
@@ -273,8 +338,44 @@ grammar_declaration:
     {
       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
     {
@@ -286,24 +387,25 @@ symbol_declaration:
       current_class = unknown_sym;
       current_type = NULL;
     }
-| "%type" TYPE symbols.1
+| "%type" TAG symbols.1
     {
       symbol_list *list;
+      tag_seen = true;
       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:
-  precedence_declarator type.opt symbols.1
+  precedence_declarator tag.opt symbols.prec
     {
       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;
@@ -311,49 +413,77 @@ precedence_declaration:
 ;
 
 precedence_declarator:
-  "%left"     { $$ = left_assoc; }
-| "%right"    { $$ = right_assoc; }
-| "%nonassoc" { $$ = non_assoc; }
+  "%left"       { $$ = left_assoc; }
+| "%right"      { $$ = right_assoc; }
+| "%nonassoc"   { $$ = non_assoc; }
+| "%precedence" { $$ = precedence_assoc; }
 ;
 
-type.opt:
+tag.opt:
   /* Nothing. */ { current_type = NULL; }
-| TYPE           { current_type = $1; }
+| TAG            { current_type = $1; tag_seen = true; }
+;
+
+/* 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)); }
 ;
 
-/* One or more nonterminals to be %typed. */
+symbol.prec:
+    symbol { $$ = $1; }
+  | symbol INT { $$ = $1; symbol_user_token_number_set ($1, $2, @2); }
+  ;
 
+/* One or more symbols to be %typed. */
 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    { $$ = symbol_list_sym_new ($1, @1); }
+| TAG       { $$ = symbol_list_type_new ($1, @1); }
+| "<*>"     { $$ = symbol_list_default_tagged_new (@1); }
+| "<>"      { $$ = symbol_list_default_tagless_new (@1); }
 ;
 
 /* One token definition.  */
 symbol_def:
-  TYPE
+  TAG
      {
        current_type = $1;
+       tag_seen = true;
      }
-| ID
+| id
      {
-       symbol_class_set ($1, current_class, @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);
+      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);
+      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);
+      symbol_class_set ($1, current_class, @1, true);
       symbol_type_set ($1, current_type, @1);
       symbol_user_token_number_set ($1, $2, @2);
       symbol_make_alias ($1, $3, @$);
@@ -381,10 +511,6 @@ grammar:
 rules_or_grammar_declaration:
   rules
 | grammar_declaration ";"
-    {
-      if (yacc_flag)
-	complain_at (@$, _("POSIX forbids declarations in the grammar"));
-    }
 | error ";"
     {
       yyerrok;
@@ -392,7 +518,7 @@ rules_or_grammar_declaration:
 ;
 
 rules:
-  ID_COLON { current_lhs = $1; current_lhs_location = @1; } rhses.1
+  id_colon { current_lhs = $1; current_lhs_location = @1; } rhses.1
 ;
 
 rhses.1:
@@ -406,24 +532,79 @@ rhs:
     { grammar_current_rule_begin (current_lhs, current_lhs_location); }
 | rhs symbol
     { grammar_current_rule_symbol_append ($2, @2); }
-| rhs action
+| rhs "{...}"
     { grammar_current_rule_action_append ($2, @2); }
 | rhs "%prec" symbol
     { grammar_current_rule_prec_set ($3, @3); }
 | rhs "%dprec" INT
     { grammar_current_rule_dprec_set ($3, @3); }
-| rhs "%merge" TYPE
+| rhs "%merge" TAG
     { grammar_current_rule_merge_set ($3, @3); }
 ;
 
-symbol:
-  ID              { $$ = $1; }
-| string_as_id    { $$ = $1; }
+
+/*---------------------------.
+| variable and content.opt.  |
+`---------------------------*/
+
+variable:
+  ID
+| STRING { $$ = uniqstr_new ($1); } /* deprecated and not M4-friendly */
+;
+
+/* Some content or empty by default. */
+content.opt:
+  /* Nothing. */
+    {
+      $$ = "";
+    }
+| STRING
+;
+
+
+/*------------.
+| 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);
+    }
 ;
 
-action:
-  BRACED_CODE
-    { $$ = $1; }
+id_colon:
+  ID_COLON { $$ = symbol_from_uniqstr ($1, @1); }
+;
+
+
+symbol:
+  id
+| string_as_id
 ;
 
 /* A string used as an ID: quote it.  */
@@ -431,23 +612,20 @@ string_as_id:
   STRING
     {
       $$ = symbol_get (quotearg_style (c_quoting_style, $1), @1);
-      symbol_class_set ($$, token_sym, @1);
+      symbol_class_set ($$, token_sym, @1, false);
     }
 ;
 
-/* A string used for its contents.  Don't quote it.  */
-string_content:
-  STRING
-    { $$ = $1; }
-;
-
-
 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 ();
     }
 ;
 
@@ -532,9 +710,10 @@ add_param (char const *type, char *decl, location loc)
       free (name);
     }
 
-  scanner_last_string_free ();
+  gram_scanner_last_string_free ();
 }
 
+
 static void
 version_check (location const *loc, char const *version)
 {
@@ -557,3 +736,16 @@ token_name (int 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);
+    }
+}