%{/* Bison Grammar Parser -*- C -*-
- Copyright (C) 2002-2012 Free Software Foundation, Inc.
+ Copyright (C) 2002-2013 Free Software Foundation, Inc.
This file is part of Bison, the GNU Compiler Compiler.
static YYLTYPE lloc_default (YYLTYPE const *, int);
#define YY_LOCATION_PRINT(File, Loc) \
- location_print (File, Loc)
+ location_print (Loc, File)
static void version_check (location const *loc, char const *version);
-/* Request detailed syntax error messages, and pass them to GRAM_ERROR.
- FIXME: depends on the undocumented availability of YYLLOC. */
-#undef yyerror
-#define yyerror(Msg) \
- gram_error (&yylloc, Msg)
static void gram_error (location const *, char const *);
+/* A string that describes a char (e.g., 'a' -> "'a'"). */
static char const *char_name (char);
%}
*/
static
void
- current_lhs(symbol *sym, location loc, named_ref *ref)
+ current_lhs (symbol *sym, location loc, named_ref *ref)
{
current_lhs_symbol = sym;
current_lhs_location = loc;
}
%define api.prefix "gram_"
-%define api.pure
+%define api.pure full
%define locations
%define parse.error verbose
%define parse.lac full
boundary_set (&@$.end, current_file, 1, 1);
}
-%union
-{
- assoc assoc;
- char *code;
- char const *chars;
- int integer;
- named_ref *named_ref;
- symbol *symbol;
- symbol_list *list;
- uniqstr uniqstr;
- unsigned char character;
-};
-
/* Define the tokens together with their human representation. */
%token GRAM_EOF 0 "end of file"
%token STRING "string"
-%token INT "integer"
%token PERCENT_TOKEN "%token"
%token PERCENT_NTERM "%nterm"
%token TAG_ANY "<*>"
%token TAG_NONE "<>"
+%union {unsigned char character;}
%type <character> CHAR
%printer { fputs (char_name ($$), yyo); } CHAR
/* braceless is not to be used for rule or symbol actions, as it
calls code_props_plain_init. */
+%union
+{
+ char *code;
+ char const *chars;
+};
%type <chars> STRING "%{...%}" EPILOGUE braceless content.opt
%type <code> "{...}" "%?{...}"
%printer { fputs (quotearg_style (c_quoting_style, $$), yyo); }
%printer { fprintf (yyo, "{\n%s\n}", $$); }
braceless content.opt "{...}" "%{...%}" EPILOGUE
+%union {uniqstr uniqstr;}
%type <uniqstr> BRACKETED_ID ID ID_COLON PERCENT_FLAG TAG tag variable
%printer { fputs ($$, yyo); } <uniqstr>
%printer { fprintf (yyo, "[%s]", $$); } BRACKETED_ID
%printer { fprintf (yyo, "%%%s", $$); } PERCENT_FLAG
%printer { fprintf (yyo, "<%s>", $$); } TAG tag
-%type <integer> INT
+%union {int integer;};
+%token <integer> INT "integer"
%printer { fprintf (yyo, "%d", $$); } <integer>
+%union {symbol *symbol;}
%type <symbol> id id_colon string_as_id symbol symbol.prec
%printer { fprintf (yyo, "%s", $$->tag); } <symbol>
%printer { fprintf (yyo, "%s:", $$->tag); } id_colon
+%union {assoc assoc;};
%type <assoc> precedence_declarator
+
+%union {symbol_list *list;}
%type <list> symbols.1 symbols.prec generic_symlist generic_symlist_item
+
+%union {named_ref *named_ref;}
%type <named_ref> named_ref.opt
/*---------.
{
#define CASE(In, Out) \
case param_ ## In: fputs ("%" #Out, stderr); break
- CASE(lex, lex-param);
- CASE(parse, parse-param);
- CASE(both, param);
+ CASE (lex, lex-param);
+ CASE (parse, parse-param);
+ CASE (both, param);
#undef CASE
case param_none: aver (false); break;
}
`------------------------------------*/
prologue_declarations:
- /* Nothing */
+ %empty
| prologue_declarations prologue_declaration
;
%token PERCENT_UNION "%union";
union_name:
- /* Nothing. */ {}
-| ID { muscle_code_grow ("union_name", $1, @1); }
+ %empty {}
+| ID { muscle_code_grow ("union_name", $1, @1); }
;
grammar_declaration:
"%union" union_name braceless
{
union_seen = true;
- muscle_code_grow ("stype", $3, @3);
+ muscle_code_grow ("union_members", $3, @3);
code_scanner_last_string_free ();
}
;
;
tag.opt:
- /* Nothing. */ { current_type = NULL; }
-| TAG { current_type = $1; tag_seen = true; }
+ %empty { current_type = NULL; }
+| TAG { current_type = $1; tag_seen = true; }
;
/* Just like symbols.1 but accept INT for the sake of POSIX. */
symbol.prec
{ $$ = symbol_list_sym_new ($1, @1); }
| symbols.prec symbol.prec
- { $$ = symbol_list_prepend ($1, symbol_list_sym_new ($2, @2)); }
+ { $$ = symbol_list_append ($1, symbol_list_sym_new ($2, @2)); }
;
symbol.prec:
- symbol { $$ = $1; }
-| symbol INT { $$ = $1; symbol_user_token_number_set ($1, $2, @2); }
+ symbol
+ {
+ $$ = $1;
+ symbol_class_set ($1, token_sym, @1, false);
+ }
+| symbol INT
+ {
+ $$ = $1;
+ symbol_user_token_number_set ($1, $2, @2);
+ symbol_class_set ($1, token_sym, @1, false);
+ }
;
/* One or more symbols to be %typed. */
symbol
{ $$ = symbol_list_sym_new ($1, @1); }
| symbols.1 symbol
- { $$ = symbol_list_prepend ($1, symbol_list_sym_new ($2, @2)); }
+ { $$ = symbol_list_append ($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 generic_symlist_item { $$ = symbol_list_append ($1, $2); }
;
generic_symlist_item:
/* One token definition. */
symbol_def:
TAG
- {
- current_type = $1;
- tag_seen = true;
- }
+ {
+ current_type = $1;
+ tag_seen = true;
+ }
| id
- {
- symbol_class_set ($1, current_class, @1, true);
- symbol_type_set ($1, current_type, @1);
- }
+ {
+ symbol_class_set ($1, current_class, @1, true);
+ symbol_type_set ($1, current_type, @1);
+ }
| id INT
{
symbol_class_set ($1, current_class, @1, true);
| rhses.1 ";"
;
+%token PERCENT_EMPTY "%empty";
rhs:
- /* Nothing. */
+ %empty
{ grammar_current_rule_begin (current_lhs_symbol, current_lhs_location,
current_lhs_named_ref); }
| rhs symbol named_ref.opt
{ grammar_current_rule_action_append ($2, @2, $3, false); }
| rhs "%?{...}"
{ grammar_current_rule_action_append ($2, @2, NULL, true); }
+| rhs "%empty"
+ { grammar_current_rule_empty_set (@2); }
| rhs "%prec" symbol
{ grammar_current_rule_prec_set ($3, @3); }
| rhs "%dprec" INT
;
named_ref.opt:
- /* Nothing. */ { $$ = 0; }
-|
- BRACKETED_ID { $$ = named_ref_new($1, @1); }
+ %empty { $$ = 0; }
+| BRACKETED_ID { $$ = named_ref_new($1, @1); }
;
/*---------------------------.
`---------------------------*/
/* The STRING form of variable is deprecated and is not M4-friendly.
- For example, M4 fails for `%define "[" "value"'. */
+ For example, M4 fails for '%define "[" "value"'. */
variable:
ID
| STRING { $$ = uniqstr_new ($1); }
/* Some content or empty by default. */
content.opt:
- /* Nothing. */ { $$ = ""; }
-| ID { $$ = $1; }
-| STRING
+ %empty { $$ = ""; }
+| ID { $$ = $1; }
+| STRING { $$ = $1; }
;
;
epilogue.opt:
- /* Nothing. */
+ %empty
| "%%" EPILOGUE
{
code_props plain_code;
projects / bison.git / blobdiff