/* Bison Grammar Parser -*- C -*-
- Copyright (C) 2002 Free Software Foundation, Inc.
+
+ Copyright (C) 2002-2013 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,
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., 59 Temple Place, Suite 330, Boston, MA
- 02111-1307 USA
-*/
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
+%code requires
+{
+ #include "symlist.h"
+ #include "symtab.h"
+}
-%debug
-%defines
-%locations
-%pure-parser
-// %error-verbose
+%code
+{
+ #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 "named-ref.h"
+ #include "quotearg.h"
+ #include "reader.h"
+ #include "scan-gram.h"
+ #include "scan-code.h"
+ #include "xmemdup0.h"
+
+ static int current_prec = 0;
+ static location current_lhs_location;
+ static named_ref *current_lhs_named_ref;
+ static symbol *current_lhs_symbol;
+ static symbol_class current_class = unknown_sym;
+ static uniqstr current_type = NULL;
+
+ /** 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);
+
+ #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 (Loc, File)
+
+ /* Strip initial '{' and final '}' (must be first and last characters).
+ Return the result. */
+ static char *strip_braces (char *code);
+
+ /* Convert CODE by calling code_props_plain_init if PLAIN, otherwise
+ code_props_symbol_action_init. Call
+ gram_scanner_last_string_free to release the latest string from
+ the scanner (should be CODE). */
+ static char const *translate_code (char *code, location loc, bool plain);
+
+ /* Convert CODE by calling code_props_plain_init after having
+ stripped the first and last characters (expected to be '{', and
+ '}'). Call gram_scanner_last_string_free to release the latest
+ string from the scanner (should be CODE). */
+ static char const *translate_code_braceless (char *code, location loc);
+
+ static void version_check (location const *loc, char const *version);
+
+ static void gram_error (location const *, char const *);
+
+ /* A string that describes a char (e.g., 'a' -> "'a'"). */
+ static char const *char_name (char);
+
+ #define YYTYPE_INT16 int_fast16_t
+ #define YYTYPE_INT8 int_fast8_t
+ #define YYTYPE_UINT16 uint_fast16_t
+ #define YYTYPE_UINT8 uint_fast8_t
+}
+
+%define api.prefix {gram_}
+%define api.pure full
+%define locations
+%define parse.error verbose
+%define parse.lac full
+%define parse.trace
%defines
-%name-prefix="gram_"
-
-%{
-#include "system.h"
-#include "complain.h"
-#include "muscle_tab.h"
-#include "files.h"
-#include "getargs.h"
-#include "output.h"
-#include "symlist.h"
-#include "gram.h"
-#include "reader.h"
-#include "conflicts.h"
-
-/* Produce verbose parse errors. */
-#define YYERROR_VERBOSE 1
-#define YYLLOC_DEFAULT(Current, Rhs, N) \
-do { \
- if (N) \
- { \
- Current.first_column = Rhs[1].first_column; \
- Current.first_line = Rhs[1].first_line; \
- Current.last_column = Rhs[N].last_column; \
- Current.last_line = Rhs[N].last_line; \
- } \
- else \
- { \
- Current = Rhs[0]; \
- } \
-} while (0)
-
-/* Pass the control structure to YYPARSE and YYLEX. */
-#define YYPARSE_PARAM gram_control
-#define YYLEX_PARAM gram_control
-/* YYPARSE receives GRAM_CONTROL as a void *. Provide a
- correctly typed access to it. */
-#define yycontrol ((gram_control_t *) gram_control)
-
-/* Request detailed parse error messages, and pass them to GRAM_ERROR.
- FIXME: depends on the undocumented availability of YYLLOC.t */
-#undef yyerror
-#define yyerror(Msg) \
- gram_error (&yylloc, Msg)
-
-#define YYPRINT(File, Type, Value) \
- yyprint (File, Type, &Value)
-static void yyprint (FILE *file, int type, const yystype *value);
-
-symbol_class current_class = unknown_sym;
-char *current_type = 0;
-symbol_t *current_lhs;
-location_t current_lhs_location;
-assoc_t current_assoc;
-int current_prec = 0;
-braced_code_t current_braced_code = action_braced_code;
-%}
-
-
-/* Only NUMBERS have a value. */
-%union
+%expect 0
+%verbose
+
+%initial-action
{
- symbol_t *symbol;
- symbol_list_t *list;
- int integer;
- char *string;
- assoc_t assoc;
-};
+ /* Bison's grammar can initial empty locations, hence a default
+ location is needed. */
+ boundary_set (&@$.start, current_file, 1, 1);
+ boundary_set (&@$.end, current_file, 1, 1);
+}
/* 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 PERCENT_DESTRUCTOR "%destructor"
%token PERCENT_PRINTER "%printer"
-%token PERCENT_UNION "%union"
-
%token PERCENT_LEFT "%left"
%token PERCENT_RIGHT "%right"
%token PERCENT_NONASSOC "%nonassoc"
+%token PERCENT_PRECEDENCE "%precedence"
%token PERCENT_PREC "%prec"
%token PERCENT_DPREC "%dprec"
%token PERCENT_MERGE "%merge"
-
/*----------------------.
| Global Declarations. |
`----------------------*/
%token
- PERCENT_DEBUG "%debug"
- PERCENT_DEFINE "%define"
- PERCENT_DEFINES "%defines"
- PERCENT_ERROR_VERBOSE "%error-verbose"
- PERCENT_EXPECT "%expect"
- PERCENT_FILE_PREFIX "%file-prefix"
- PERCENT_GLR_PARSER "%glr-parser"
- PERCENT_LEX_PARAM "%lex-param"
- PERCENT_LOCATIONS "%locations"
- PERCENT_NAME_PREFIX "%name-prefix"
- PERCENT_NO_LINES "%no-lines"
- PERCENT_OUTPUT "%output"
- PERCENT_PARSE_PARAM "%parse-param"
- PERCENT_PURE_PARSER "%pure-parser"
- PERCENT_SKELETON "%skeleton"
- PERCENT_START "%start"
- PERCENT_TOKEN_TABLE "%token-table"
- PERCENT_VERBOSE "%verbose"
- PERCENT_YACC "%yacc"
-;
-
-%token TYPE "type"
+ PERCENT_CODE "%code"
+ PERCENT_DEFAULT_PREC "%default-prec"
+ PERCENT_DEFINE "%define"
+ PERCENT_DEFINES "%defines"
+ PERCENT_ERROR_VERBOSE "%error-verbose"
+ PERCENT_EXPECT "%expect"
+ PERCENT_EXPECT_RR "%expect-rr"
+ PERCENT_FLAG "%<flag>"
+ PERCENT_FILE_PREFIX "%file-prefix"
+ PERCENT_GLR_PARSER "%glr-parser"
+ PERCENT_INITIAL_ACTION "%initial-action"
+ PERCENT_LANGUAGE "%language"
+ PERCENT_NAME_PREFIX "%name-prefix"
+ PERCENT_NO_DEFAULT_PREC "%no-default-prec"
+ PERCENT_NO_LINES "%no-lines"
+ PERCENT_NONDETERMINISTIC_PARSER
+ "%nondeterministic-parser"
+ PERCENT_OUTPUT "%output"
+ PERCENT_REQUIRE "%require"
+ PERCENT_SKELETON "%skeleton"
+ PERCENT_START "%start"
+ PERCENT_TOKEN_TABLE "%token-table"
+ PERCENT_VERBOSE "%verbose"
+ PERCENT_YACC "%yacc"
+;
+
+%token BRACED_CODE "{...}"
+%token BRACED_PREDICATE "%?{...}"
+%token BRACKETED_ID "[identifier]"
+%token CHAR "char"
+%token EPILOGUE "epilogue"
%token EQUAL "="
-%token SEMICOLON ";"
-%token COLON ":"
-%token COMMA ","
-%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 "<>"
+
+%union {unsigned char character;}
+%type <character> CHAR
+%printer { fputs (char_name ($$), yyo); } CHAR
+
+%union {char *code;};
+%type <code> "{...}" "%?{...}" "%{...%}" EPILOGUE STRING
+%printer { fputs (quotearg_style (c_quoting_style, $$), yyo); } STRING
+%printer { fprintf (yyo, "{\n%s\n}", $$); } <code>
+
+%union {uniqstr uniqstr;}
+%type <uniqstr> BRACKETED_ID ID ID_COLON PERCENT_FLAG TAG tag variable
+%printer { fputs ($$, yyo); } <uniqstr>
+%printer { fprintf (yyo, "[%s]", $$); } BRACKETED_ID
+%printer { fprintf (yyo, "%s:", $$); } ID_COLON
+%printer { fprintf (yyo, "%%%s", $$); } PERCENT_FLAG
+%printer { fprintf (yyo, "<%s>", $$); } TAG tag
+
+%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:", $$->tag); } id_colon
+
+%union {assoc assoc;};
+%type <assoc> precedence_declarator
+%union {symbol_list *list;}
+%type <list> symbols.1 symbols.prec generic_symlist generic_symlist_item
-%type <string> TYPE STRING string_content
- BRACED_CODE PROLOGUE EPILOGUE epilogue.opt action
-%type <integer> INT
-%type <symbol> ID symbol string_as_id
-%type <assoc> precedence_declarator
-%type <list> symbols.1
-%%
+%union {named_ref *named_ref;}
+%type <named_ref> named_ref.opt
-input:
- declarations "%%" grammar epilogue.opt
+/*---------.
+| %param. |
+`---------*/
+%code requires
+{
+ typedef enum
+ {
+ param_none = 0,
+ param_lex = 1 << 0,
+ param_parse = 1 << 1,
+ param_both = param_lex | param_parse
+ } param_type;
+};
+%code
+{
+ /** Add a lex-param and/or a parse-param.
+ *
+ * \param type where to push this formal argument.
+ * \param decl the formal argument. Destroyed.
+ * \param loc the location in the source.
+ */
+ static void add_param (param_type type, char *decl, location loc);
+ static param_type current_param = param_none;
+};
+%union {param_type param;}
+%token <param> PERCENT_PARAM "%param";
+%printer
+{
+ switch ($$)
{
- yycontrol->errcode = 0;
- epilogue_set ($4, @4);
+#define CASE(In, Out) \
+ case param_ ## In: fputs ("%" #Out, yyo); break
+ CASE (lex, lex-param);
+ CASE (parse, parse-param);
+ CASE (both, param);
+#undef CASE
+ case param_none: aver (false); break;
}
+} <param>;
+
+
+ /*==========\
+ | Grammar. |
+ \==========*/
+%%
+
+input:
+ prologue_declarations "%%" grammar epilogue.opt
;
- /*------------------------------------.
- | Declarations: before the first %%. |
- `------------------------------------*/
+ /*------------------------------------.
+ | Declarations: before the first %%. |
+ `------------------------------------*/
-declarations:
- /* Nothing */
-| declarations declaration semi_colon.opt
+prologue_declarations:
+ %empty
+| prologue_declarations prologue_declaration
;
-declaration:
+prologue_declaration:
grammar_declaration
-| PROLOGUE { prologue_augment ($1, @1); }
-| "%debug" { debug_flag = 1; }
-| "%define" string_content string_content { muscle_insert ($2, $3); }
-| "%defines" { defines_flag = 1; }
-| "%error-verbose" { error_verbose = 1; }
-| "%expect" INT { expected_conflicts = $2; }
-| "%file-prefix" "=" string_content { spec_file_prefix = $3; }
-| "%glr-parser" { glr_parser = 1; }
-| "%lex-param" string_content "," string_content
- { muscle_pair_list_grow ("lex_param", $2, $4); }
-| "%locations" { locations_flag = 1; }
-| "%name-prefix" "=" string_content { spec_name_prefix = $3; }
-| "%no-lines" { no_lines_flag = 1; }
-| "%output" "=" string_content { spec_outfile = $3; }
-| "%parse-param" string_content "," string_content
- { muscle_pair_list_grow ("parse_param", $2, $4); }
-| "%pure-parser" { pure_parser = 1; }
-| "%skeleton" string_content { skeleton = $2; }
-| "%token-table" { token_table_flag = 1; }
-| "%verbose" { report_flag = 1; }
-| "%yacc" { yacc_flag = 1; }
+| "%{...%}"
+ {
+ muscle_code_grow (union_seen ? "post_prologue" : "pre_prologue",
+ translate_code ($1, @1, true), @1);
+ code_scanner_last_string_free ();
+ }
+| "%<flag>"
+ {
+ muscle_percent_define_ensure ($1, @1, true);
+ }
+| "%define" variable value
+ {
+ muscle_percent_define_insert ($2, @2, $3.kind, $3.chars,
+ MUSCLE_PERCENT_DEFINE_GRAMMAR_FILE);
+ }
+| "%defines" { defines_flag = true; }
+| "%defines" STRING
+ {
+ defines_flag = true;
+ spec_defines_file = xstrdup ($2);
+ }
+| "%error-verbose"
+ {
+ muscle_percent_define_insert ("parse.error", @1, muscle_keyword,
+ "verbose",
+ MUSCLE_PERCENT_DEFINE_GRAMMAR_FILE);
+ }
+| "%expect" INT { expected_sr_conflicts = $2; }
+| "%expect-rr" INT { expected_rr_conflicts = $2; }
+| "%file-prefix" STRING { spec_file_prefix = $2; }
+| "%glr-parser"
+ {
+ nondeterministic_parser = true;
+ glr_parser = true;
+ }
+| "%initial-action" "{...}"
+ {
+ muscle_code_grow ("initial_action", translate_code ($2, @2, false), @2);
+ code_scanner_last_string_free ();
+ }
+| "%language" STRING { language_argmatch ($2, grammar_prio, @1); }
+| "%name-prefix" STRING { spec_name_prefix = $2; }
+| "%no-lines" { no_lines_flag = true; }
+| "%nondeterministic-parser" { nondeterministic_parser = true; }
+| "%output" STRING { spec_outfile = $2; }
+| "%param" { current_param = $1; } params { current_param = param_none; }
+| "%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)
+ {
+ 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);
+ }
+| "%token-table" { token_table_flag = true; }
+| "%verbose" { report_flag |= report_states; }
+| "%yacc" { yacc_flag = true; }
+| /*FIXME: Err? What is this horror doing here? */ ";"
;
+params:
+ params "{...}" { add_param (current_param, $2, @2); }
+| "{...}" { add_param (current_param, $1, @1); }
+;
+
+
+/*----------------------.
+| grammar_declaration. |
+`----------------------*/
+
grammar_declaration:
precedence_declaration
| symbol_declaration
{
grammar_start_symbol_set ($2, @2);
}
-| "%union" BRACED_CODE
+| code_props_type "{...}" generic_symlist
+ {
+ 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_code_props_set (list, $1, &code);
+ symbol_list_free ($3);
+ }
+ }
+| "%default-prec"
+ {
+ default_prec = true;
+ }
+| "%no-default-prec"
{
- typed = 1;
- MUSCLE_INSERT_INT ("stype_line", @2.first_line);
- muscle_insert ("stype", $2);
+ default_prec = false;
}
-| "%destructor"
- { current_braced_code = destructor_braced_code; }
- BRACED_CODE symbols.1
+| "%code" "{...}"
{
- symbol_list_t *list;
- for (list = $4; list; list = list->next)
- symbol_destructor_set (list->sym, $3, @3);
- symbol_list_free ($4);
- current_braced_code = action_braced_code;
+ /* Do not invoke muscle_percent_code_grow here since it invokes
+ muscle_user_name_list_grow. */
+ muscle_code_grow ("percent_code()",
+ translate_code_braceless ($2, @2), @2);
+ code_scanner_last_string_free ();
}
-| "%printer"
- { current_braced_code = printer_braced_code; }
- BRACED_CODE symbols.1
+| "%code" ID "{...}"
{
- symbol_list_t *list;
- for (list = $4; list; list = list->next)
- symbol_printer_set (list->sym, $3, list->location);
- symbol_list_free ($4);
- current_braced_code = action_braced_code;
+ muscle_percent_code_grow ($2, @2, translate_code_braceless ($3, @3), @3);
+ code_scanner_last_string_free ();
}
;
+%type <code_type> code_props_type;
+%union {code_props_type code_type;};
+%printer { fprintf (yyo, "%s", code_props_type_string ($$)); } <code_type>;
+code_props_type:
+ "%destructor" { $$ = destructor; }
+| "%printer" { $$ = printer; }
+;
+
+/*---------.
+| %union. |
+`---------*/
+
+%token PERCENT_UNION "%union";
+
+union_name:
+ %empty {}
+| ID { muscle_code_grow ("union_name", $1, @1); }
+;
+
+grammar_declaration:
+ "%union" union_name "{...}"
+ {
+ union_seen = true;
+ muscle_code_grow ("union_members", translate_code_braceless ($3, @3), @3);
+ code_scanner_last_string_free ();
+ }
+;
+
+
+
+
symbol_declaration:
"%nterm" { current_class = nterm_sym; } symbol_defs.1
{
current_class = unknown_sym;
current_type = NULL;
}
-| "%type" TYPE symbols.1
+| "%type" TAG symbols.1
{
- symbol_list_t *list;
+ symbol_list *list;
+ tag_seen = true;
for (list = $3; list; list = list->next)
- symbol_type_set (list->sym, $2, @2);
+ symbol_type_set (list->content.sym, $2, @2);
symbol_list_free ($3);
}
;
precedence_declaration:
- precedence_declarator type.opt symbols.1
+ precedence_declarator tag.opt symbols.prec
{
- symbol_list_t *list;
+ symbol_list *list;
++current_prec;
for (list = $3; list; list = list->next)
- {
- symbol_type_set (list->sym, current_type, @2);
- symbol_precedence_set (list->sym, current_prec, $1, @1);
- }
+ {
+ symbol_type_set (list->content.sym, current_type, @2);
+ symbol_precedence_set (list->content.sym, current_prec, $1, @1);
+ }
symbol_list_free ($3);
current_type = NULL;
}
;
precedence_declarator:
- "%left" { $$ = left_assoc; }
-| "%right" { $$ = right_assoc; }
-| "%nonassoc" { $$ = non_assoc; }
+ "%left" { $$ = left_assoc; }
+| "%right" { $$ = right_assoc; }
+| "%nonassoc" { $$ = non_assoc; }
+| "%precedence" { $$ = precedence_assoc; }
;
-type.opt:
- /* Nothing. */ { current_type = NULL; }
-| TYPE { current_type = $1; }
+tag.opt:
+ %empty { current_type = NULL; }
+| TAG { 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_append ($1, symbol_list_sym_new ($2, @2)); }
+;
+
+symbol.prec:
+ 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. */
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_append ($1, symbol_list_sym_new ($2, @2)); }
+;
+
+generic_symlist:
+ generic_symlist_item { $$ = $1; }
+| generic_symlist generic_symlist_item { $$ = symbol_list_append ($1, $2); }
+;
+
+generic_symlist_item:
+ symbol { $$ = symbol_list_sym_new ($1, @1); }
+| tag { $$ = symbol_list_type_new ($1, @1); }
+;
+
+tag:
+ TAG
+| "<*>" { $$ = uniqstr_new ("*"); }
+| "<>" { $$ = uniqstr_new (""); }
;
/* One token definition. */
symbol_def:
- TYPE
- {
- current_type = $1;
- }
-| ID
- {
- symbol_class_set ($1, current_class, @1);
- symbol_type_set ($1, current_type, @1);
- }
-| ID INT
- {
- symbol_class_set ($1, current_class, @1);
+ TAG
+ {
+ current_type = $1;
+ tag_seen = true;
+ }
+| id
+ {
+ 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);
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, $3, @$);
/* One or more symbol definitions. */
symbol_defs.1:
symbol_def
- {;}
| symbol_defs.1 symbol_def
- {;}
;
- /*------------------------------------------.
- | The grammar section: between the two %%. |
- `------------------------------------------*/
+ /*------------------------------------------.
+ | The grammar section: between the two %%. |
+ `------------------------------------------*/
grammar:
rules_or_grammar_declaration
;
/* As a Bison extension, one can use the grammar declarations in the
- body of the grammar. But to remain LALR(1), they must be ended
- with a semi-colon. */
+ body of the grammar. */
rules_or_grammar_declaration:
rules
| grammar_declaration ";"
- {
- if (yacc_flag)
- complain_at (@$, _("POSIX forbids declarations in the grammar"));
- }
| error ";"
{
yyerrok;
;
rules:
- ID ":" { 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:
- rhs { grammar_rule_end (@1); }
-| rhses.1 "|" rhs { grammar_rule_end (@3); }
+ rhs { grammar_current_rule_end (@1); }
+| rhses.1 "|" rhs { grammar_current_rule_end (@3); }
+| rhses.1 ";"
;
+%token PERCENT_EMPTY "%empty";
rhs:
- /* Nothing. */
- { grammar_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); }
+ %empty
+ { 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, 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
{ 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; }
+named_ref.opt:
+ %empty { $$ = 0; }
+| BRACKETED_ID { $$ = named_ref_new($1, @1); }
;
-action:
- BRACED_CODE
- { $$ = $1; }
+/*---------------------.
+| variable and value. |
+`---------------------*/
+
+/* The STRING form of variable is deprecated and is not M4-friendly.
+ For example, M4 fails for '%define "[" "value"'. */
+variable:
+ ID
+| STRING { $$ = uniqstr_new ($1); }
;
-/* A string used as an ID: we have to keep the quotes. */
-string_as_id:
- STRING
+/* Some content or empty by default. */
+%code requires {#include "muscle-tab.h"};
+%union
+{
+ struct
+ {
+ char const *chars;
+ muscle_kind kind;
+ } value;
+};
+%type <value> value;
+%printer
+{
+ switch ($$.kind)
{
- $$ = symbol_get ($1, @1);
- symbol_class_set ($$, token_sym, @1);
+ case muscle_code: fprintf (yyo, "{%s}", $$.chars); break;
+ case muscle_keyword: fprintf (yyo, "%s", $$.chars); break;
+ case muscle_string: fprintf (yyo, "\"%s\"", $$.chars); break;
}
+} <value>;
+
+value:
+ %empty { $$.kind = muscle_keyword; $$.chars = ""; }
+| ID { $$.kind = muscle_keyword; $$.chars = $1; }
+| STRING { $$.kind = muscle_string; $$.chars = $1; }
+| "{...}" { $$.kind = muscle_code;
+ $$.chars = translate_code_braceless ($1, @1); }
;
-/* A string used for its contents. Strip the quotes. */
-string_content:
- STRING
+
+/*--------------.
+| Identifiers. |
+`--------------*/
+
+/* Identifiers are returned as uniqstr values by the scanner.
+ Depending on their use, we may need to make them genuine symbols. */
+
+id:
+ ID
+ { $$ = symbol_from_uniqstr ($1, @1); }
+| CHAR
{
- $$ = $1 + 1;
- $$[strlen ($$) - 1] = '\0';
- };
+ $$ = symbol_get (char_name ($1), @1);
+ symbol_class_set ($$, token_sym, @1, false);
+ symbol_user_token_number_set ($$, $1, @1);
+ }
+;
+
+id_colon:
+ ID_COLON { $$ = symbol_from_uniqstr ($1, @1); }
+;
-epilogue.opt:
- /* Nothing. */
+symbol:
+ id
+| string_as_id
+;
+
+/* A string used as an ID: quote it. */
+string_as_id:
+ STRING
{
- $$ = xstrdup ("");
+ $$ = symbol_get (quotearg_style (c_quoting_style, $1), @1);
+ symbol_class_set ($$, token_sym, @1, false);
}
+;
+
+epilogue.opt:
+ %empty
| "%%" EPILOGUE
{
- $$ = $2;
+ muscle_code_grow ("epilogue", translate_code ($2, @2, true), @2);
+ code_scanner_last_string_free ();
}
;
-semi_colon.opt:
- /* Nothing. */
-| ";"
-;
%%
-/*------------------------------------------------------------------.
-| When debugging the parser, display tokens' locations and values. |
-`------------------------------------------------------------------*/
+
+/* Return the location of the left-hand side of a rule whose
+ right-hand side is RHS[1] ... RHS[N]. Ignore empty nonterminals in
+ the right-hand side, and return an empty location equal to the end
+ boundary of RHS[0] if the right-hand side is empty. */
+
+static YYLTYPE
+lloc_default (YYLTYPE const *rhs, int n)
+{
+ int i;
+ YYLTYPE loc;
+
+ /* SGI MIPSpro 7.4.1m miscompiles "loc.start = loc.end = rhs[n].end;".
+ The bug is fixed in 7.4.2m, but play it safe for now. */
+ loc.start = rhs[n].end;
+ loc.end = rhs[n].end;
+
+ /* 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++)
+ if (! equal_boundaries (rhs[i].start, rhs[i].end))
+ {
+ loc.start = rhs[i].start;
+ break;
+ }
+
+ return loc;
+}
+
+static
+char *strip_braces (char *code)
+{
+ code[strlen(code) - 1] = 0;
+ return code + 1;
+}
+
+static
+char const *
+translate_code (char *code, location loc, bool plain)
+{
+ code_props plain_code;
+ if (plain)
+ code_props_plain_init (&plain_code, code, loc);
+ else
+ code_props_symbol_action_init (&plain_code, code, loc);
+ code_props_translate_code (&plain_code);
+ gram_scanner_last_string_free ();
+ return plain_code.code;
+}
+
+static
+char const *
+translate_code_braceless (char *code, location loc)
+{
+ return translate_code (strip_braces (code), loc, true);
+}
static void
-yyprint (FILE *file,
- int type, const yystype *value)
+add_param (param_type type, char *decl, location loc)
{
- fputc (' ', file);
- switch (type)
+ static char const alphanum[26 + 26 + 1 + 10] =
+ "abcdefghijklmnopqrstuvwxyz"
+ "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
+ "_"
+ "0123456789";
+
+ char const *name_start = NULL;
+ {
+ char *p;
+ /* Stop on last actual character. */
+ for (p = decl; p[1]; p++)
+ if ((p == decl
+ || ! memchr (alphanum, p[-1], sizeof alphanum))
+ && memchr (alphanum, p[0], sizeof alphanum - 10))
+ name_start = p;
+
+ /* Strip the surrounding '{' and '}', and any blanks just inside
+ the braces. */
+ --p;
+ while (c_isspace ((unsigned char) *p))
+ --p;
+ p[1] = '\0';
+ ++decl;
+ while (c_isspace ((unsigned char) *decl))
+ ++decl;
+ }
+
+ if (! name_start)
+ complain (&loc, complaint, _("missing identifier in parameter declaration"));
+ else
{
- case ID:
- fprintf (file, " = %s", value->symbol->tag);
- break;
+ char *name = xmemdup0 (name_start, strspn (name_start, alphanum));
+ if (type & param_lex)
+ muscle_pair_list_grow ("lex_param", decl, name);
+ if (type & param_parse)
+ muscle_pair_list_grow ("parse_param", decl, name);
+ free (name);
+ }
- case INT:
- fprintf (file, " = %d", value->integer);
- break;
+ gram_scanner_last_string_free ();
+}
- case STRING:
- fprintf (file, " = \"%s\"", value->string);
- break;
- case TYPE:
- fprintf (file, " = <%s>", value->string);
- break;
+static void
+version_check (location const *loc, char const *version)
+{
+ if (strverscmp (version, PACKAGE_VERSION) > 0)
+ {
+ complain (loc, complaint, "require bison %s, but have %s",
+ version, PACKAGE_VERSION);
+ exit (EX_MISMATCH);
+ }
+}
- case BRACED_CODE:
- case PROLOGUE:
- case EPILOGUE:
- fprintf (file, " = {{ %s }}", value->string);
- break;
+static void
+gram_error (location const *loc, char const *msg)
+{
+ complain (loc, complaint, "%s", msg);
+}
+
+char const *
+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);
}
}
+static
void
-gram_error (location_t *yylloc, const char *msg)
+current_lhs (symbol *sym, location loc, named_ref *ref)
{
- complain_at (*yylloc, "%s", msg);
+ 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;
}
projects / bison.git / blobdiff