X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/e776192e4fcb3b34d8a279d7cc1ea153e96ae2e7..985d7177e8aaedcabe48dd911077ddcc8f74891f:/src/parse-gram.y?ds=sidebyside
diff --git a/src/parse-gram.y b/src/parse-gram.y
index 66b8c68e..4c87c909 100644
--- a/src/parse-gram.y
+++ b/src/parse-gram.y
@@ -1,11 +1,12 @@
/* 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,
@@ -14,89 +15,101 @@
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 . */
+%code requires
+{
+ #include "symlist.h"
+ #include "symtab.h"
+}
-%debug
-%defines
-%locations
-%pure-parser
-// %error-verbose
+%code
+{
+ #include
+ #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 "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. */
-#undef yyerror
-#define yyerror(Msg) \
- gram_error (yycontrol, &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;
-associativity 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;
- associativity 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 there human representation. */
-%token GRAM_EOF 0 "end of string"
-%token STRING CHARACTER
-%token INT
+/* Define the tokens together with their human representation. */
+%token GRAM_EOF 0 "end of file"
+%token STRING "string"
%token PERCENT_TOKEN "%token"
%token PERCENT_NTERM "%nterm"
@@ -105,91 +118,246 @@ braced_code_t current_braced_code = action_braced_code;
%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_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 "%"
+ 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 PERCENT_EXPECT "%expect"
-%token PERCENT_START "%start"
-%token PERCENT_PREC "%prec"
-%token PERCENT_VERBOSE "%verbose"
-%token PERCENT_ERROR_VERBOSE "%error-verbose"
-
-%token PERCENT_OUTPUT "%output"
-%token PERCENT_FILE_PREFIX "%file-prefix"
-%token PERCENT_NAME_PREFIX "%name-prefix"
-
-%token PERCENT_DEFINE "%define"
-%token PERCENT_PURE_PARSER "%pure-parser"
+%token BRACED_CODE "{...}"
+%token BRACED_PREDICATE "%?{...}"
+%token BRACKETED_ID "[identifier]"
+%token CHAR "char"
+%token EPILOGUE "epilogue"
+%token EQUAL "="
+%token ID "identifier"
+%token ID_COLON "identifier:"
+%token PERCENT_PERCENT "%%"
+%token PIPE "|"
+%token PROLOGUE "%{...%}"
+%token SEMICOLON ";"
+%token TAG ""
+%token TAG_ANY "<*>"
+%token TAG_NONE "<>"
+
+%union {unsigned char character;}
+%type CHAR
+%printer { fputs (char_name ($$), yyo); } CHAR
+
+%union {char *code;};
+%type "{...}" "%?{...}" "%{...%}" EPILOGUE STRING
+%printer { fputs (quotearg_style (c_quoting_style, $$), yyo); } STRING
+%printer { fprintf (yyo, "{\n%s\n}", $$); }
+
+%union {uniqstr uniqstr;}
+%type BRACKETED_ID ID ID_COLON PERCENT_FLAG TAG tag variable
+%printer { fputs ($$, yyo); }
+%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 INT "integer"
+%printer { fprintf (yyo, "%d", $$); }
+
+%union {symbol *symbol;}
+%type id id_colon string_as_id symbol symbol.prec
+%printer { fprintf (yyo, "%s", $$->tag); }
+%printer { fprintf (yyo, "%s:", $$->tag); } id_colon
+
+%union {assoc assoc;};
+%type precedence_declarator
-%token PERCENT_DEFINES "%defines"
+%union {symbol_list *list;}
+%type symbols.1 symbols.prec generic_symlist generic_symlist_item
-%token PERCENT_YACC "%yacc"
+%union {named_ref *named_ref;}
+%type named_ref.opt
-%token PERCENT_DEBUG "%debug"
-%token PERCENT_LOCATIONS "%locations"
-%token PERCENT_NO_LINES "%no-lines"
-%token PERCENT_SKELETON "%skeleton"
-%token PERCENT_TOKEN_TABLE "%token-table"
+/*---------.
+| %param. |
+`---------*/
+%code requires
+{
+ typedef enum
+ {
+ param_none = 0,
+ param_lex = 1 << 0,
+ param_parse = 1 << 1,
+ param_both = param_lex | param_parse
+ } param_type;
+};
+%code
+{
+ /** Add a lex-param and/or a parse-param.
+ *
+ * \param type where to push this formal argument.
+ * \param decl the formal argument. Destroyed.
+ * \param loc the location in the source.
+ */
+ static void add_param (param_type type, char *decl, location loc);
+ static param_type current_param = param_none;
+};
+%union {param_type param;}
+%token PERCENT_PARAM "%param";
+%printer
+{
+ switch ($$)
+ {
+#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;
+ }
+} ;
-%token TYPE
-%token EQUAL "="
-%token SEMICOLON ";"
-%token COLON ":"
-%token PIPE "|"
-%token ID "identifier"
-%token PERCENT_PERCENT "%%"
-%token PROLOGUE EPILOGUE
-%token BRACED_CODE
-%type CHARACTER TYPE STRING string_content
- BRACED_CODE PROLOGUE EPILOGUE epilogue.opt action
-%type INT
-%type ID symbol string_as_id
-%type precedence_declarator
-%type symbols.1
+ /*==========\
+ | Grammar. |
+ \==========*/
%%
input:
- declarations "%%" grammar epilogue.opt
- {
- yycontrol->errcode = 0;
- epilogue_set ($4, @4);
- }
+ 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; }
-| "%locations" { locations_flag = 1; }
-| "%name-prefix" "=" string_content { spec_name_prefix = $3; }
-| "%no-lines" { no_lines_flag = 1; }
-| "%output" "=" string_content { spec_outfile = $3; }
-| "%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 ();
+ }
+| "%"
+ {
+ 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
@@ -197,34 +365,72 @@ grammar_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"
{
- typed = 1;
- MUSCLE_INSERT_INT ("stype_line", @2.first_line);
- muscle_insert ("stype", $2);
+ default_prec = true;
}
-| "%destructor"
- { current_braced_code = destructor_braced_code; }
- BRACED_CODE symbols.1
+| "%no-default-prec"
{
- symbol_list_t *list;
- for (list = $4; list; list = list->next)
- symbol_destructor_set (list->sym, list->location, $3);
- symbol_list_free ($4);
- current_braced_code = action_braced_code;
+ default_prec = false;
}
-| "%printer"
- { current_braced_code = printer_braced_code; }
- BRACED_CODE symbols.1
+| "%code" "{...}"
{
- 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;
+ /* 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 ();
}
+| "%code" ID "{...}"
+ {
+ muscle_percent_code_grow ($2, @2, translate_code_braceless ($3, @3), @3);
+ code_scanner_last_string_free ();
+ }
+;
+
+%type code_props_type;
+%union {code_props_type code_type;};
+%printer { fprintf (yyo, "%s", code_props_type_string ($$)); } ;
+code_props_type:
+ "%destructor" { $$ = destructor; }
+| "%printer" { $$ = printer; }
;
+/*---------.
+| %union. |
+`---------*/
+
+%token PERCENT_UNION "%union";
+
+union_name:
+ %empty {}
+| ID { muscle_code_grow ("union_name", $1, @1); }
+;
+
+grammar_declaration:
+ "%union" union_name "{...}"
+ {
+ union_seen = true;
+ muscle_code_grow ("union_members", translate_code_braceless ($3, @3), @3);
+ code_scanner_last_string_free ();
+ }
+;
+
+
+
+
symbol_declaration:
"%nterm" { current_class = nterm_sym; } symbol_defs.1
{
@@ -236,92 +442,132 @@ symbol_declaration:
current_class = unknown_sym;
current_type = NULL;
}
-| "%type" TYPE symbols.1
+| "%type" TAG symbols.1
{
- symbol_list_t *list;
+ symbol_list *list;
+ tag_seen = true;
for (list = $3; list; list = list->next)
- symbol_type_set (list->sym, list->location, $2);
+ symbol_type_set (list->content.sym, $2, @2);
symbol_list_free ($3);
}
;
precedence_declaration:
- precedence_declarator type.opt symbols.1
+ precedence_declarator tag.opt symbols.prec
{
- symbol_list_t *list;
+ symbol_list *list;
++current_prec;
for (list = $3; list; list = list->next)
- {
- symbol_type_set (list->sym, list->location, current_type);
- symbol_precedence_set (list->sym, list->location, current_prec, $1);
- }
+ {
+ symbol_type_set (list->content.sym, current_type, @2);
+ symbol_precedence_set (list->content.sym, current_prec, $1, @1);
+ }
symbol_list_free ($3);
current_type = NULL;
}
;
precedence_declarator:
- "%left" { $$ = 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, @1, current_type);
- }
-| ID INT
- {
- symbol_class_set ($1, current_class, @1);
- symbol_type_set ($1, @1, current_type);
+ 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_type_set ($1, @1, current_type);
- 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);
- symbol_type_set ($1, @1, current_type);
+ 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);
+ 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
@@ -329,122 +575,295 @@ grammar:
;
/* 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 ";"
+| 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" TAG
+ { grammar_current_rule_merge_set ($3, @3); }
;
-symbol:
- ID { $$ = $1; }
-| string_as_id { $$ = $1; }
-| CHARACTER { $$ = getsym ($1, @1); }
+named_ref.opt:
+ %empty { $$ = 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 { $$ = uniqstr_new ($1); }
;
-/* A string used as an ID: we have to keep the quotes. */
-string_as_id:
- STRING
+/* Some content or empty by default. */
+%code requires {#include "muscle-tab.h"};
+%union
+{
+ struct
+ {
+ char const *chars;
+ muscle_kind kind;
+ } value;
+};
+%type value;
+%printer
+{
+ switch ($$.kind)
{
- $$ = getsym ($1, @1);
- symbol_class_set ($$, 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\"", $$.chars); break;
}
+} ;
+
+value:
+ %empty { $$.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 CHARACTER:
- fprintf (file, " = '%s'", value->string);
- 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 ID:
- fprintf (file, " = %s", value->symbol->tag);
- break;
+ gram_scanner_last_string_free ();
+}
- case INT:
- fprintf (file, " = %d", value->integer);
- break;
- case STRING:
- 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 TYPE:
- 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)];
+}
- case BRACED_CODE:
- case PROLOGUE:
- case EPILOGUE:
- fprintf (file, " = {{ %s }}", value->string);
- break;
+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 (gram_control_t *control ATTRIBUTE_UNUSED,
- location_t *yylloc, const char *msg)
+current_lhs (symbol *sym, location loc, named_ref *ref)
{
- LOCATION_PRINT (stderr, *yylloc);
- fprintf (stderr, ": %s\n", 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;
}