/* Bison Grammar Parser -*- C -*-
- Copyright (C) 2002 Free Software Foundation, Inc.
+
+ Copyright (C) 2002, 2003 Free Software Foundation, Inc.
This file is part of Bison, the GNU Compiler Compiler.
%defines
%locations
%pure-parser
-// %error-verbose
+%error-verbose
%defines
%name-prefix="gram_"
%{
#include "system.h"
+
#include "complain.h"
-#include "muscle_tab.h"
+#include "conflicts.h"
#include "files.h"
#include "getargs.h"
-#include "output.h"
-#include "symlist.h"
#include "gram.h"
+#include "muscle_tab.h"
+#include "output.h"
#include "reader.h"
-#include "conflicts.h"
+#include "symlist.h"
+
+#define YYLLOC_DEFAULT(Current, Rhs, N) (Current) = lloc_default (Rhs, N)
+static YYLTYPE lloc_default (YYLTYPE const *, int);
-/* 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 */
+/* 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 *);
#define YYPRINT(File, Type, Value) \
- yyprint (File, Type, &Value)
-static void yyprint (FILE *file, int type, const yystype *value);
+ print_token_value (File, Type, &Value)
+static void print_token_value (FILE *, int, YYSTYPE const *);
+
+static void add_param (char const *, char *, location);
symbol_class current_class = unknown_sym;
-char *current_type = 0;
-symbol_t *current_lhs;
-location_t current_lhs_location;
-assoc_t current_assoc;
+uniqstr current_type = 0;
+symbol *current_lhs;
+location current_lhs_location;
+assoc current_assoc;
int current_prec = 0;
-braced_code_t current_braced_code = action_braced_code;
%}
+%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;
+}
/* Only NUMBERS have a value. */
%union
{
- symbol_t *symbol;
- symbol_list_t *list;
+ symbol *symbol;
+ symbol_list *list;
int integer;
- char *string;
- assoc_t assoc;
+ char *chars;
+ assoc assoc;
+ uniqstr uniqstr;
};
/* Define the tokens together with their human representation. */
%token GRAM_EOF 0 "end of file"
%token STRING "string"
-%token CHARACTER "character"
%token INT "integer"
%token PERCENT_TOKEN "%token"
%token PERCENT_NTERM "%nterm"
%token PERCENT_TYPE "%type"
-%token PERCENT_DESTRUCTOR "%destructor"
-%token PERCENT_PRINTER "%printer"
+%token PERCENT_DESTRUCTOR "%destructor {...}"
+%token PERCENT_PRINTER "%printer {...}"
-%token PERCENT_UNION "%union"
+%token PERCENT_UNION "%union {...}"
%token PERCENT_LEFT "%left"
%token PERCENT_RIGHT "%right"
`----------------------*/
%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"
+ PERCENT_DEBUG "%debug"
+ PERCENT_DEFAULT_PREC "%default-prec"
+ 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_INITIAL_ACTION "%initial-action {...}"
+ 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"
+ 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"
%token EQUAL "="
%token SEMICOLON ";"
-%token COLON ":"
-%token COMMA ","
%token PIPE "|"
%token ID "identifier"
+%token ID_COLON "identifier:"
%token PERCENT_PERCENT "%%"
%token PROLOGUE "%{...%}"
%token EPILOGUE "epilogue"
%token BRACED_CODE "{...}"
-%type <string> CHARACTER TYPE STRING string_content
- BRACED_CODE PROLOGUE EPILOGUE epilogue.opt action
+%type <chars> STRING string_content
+ "%destructor {...}"
+ "%initial-action {...}"
+ "%lex-param {...}"
+ "%parse-param {...}"
+ "%printer {...}"
+ "%union {...}"
+ BRACED_CODE action
+ PROLOGUE EPILOGUE
+%type <uniqstr> TYPE
%type <integer> INT
-%type <symbol> ID symbol string_as_id
+%type <symbol> ID ID_COLON symbol string_as_id
%type <assoc> precedence_declarator
%type <list> symbols.1
%%
input:
declarations "%%" grammar epilogue.opt
- {
- yycontrol->errcode = 0;
- epilogue_set ($4, @4);
- }
;
declarations:
/* Nothing */
-| declarations declaration semi_colon.opt
+| declarations declaration
;
declaration:
grammar_declaration
| PROLOGUE { prologue_augment ($1, @1); }
-| "%debug" { debug_flag = 1; }
+| "%debug" { debug_flag = true; }
| "%define" string_content string_content { muscle_insert ($2, $3); }
-| "%defines" { defines_flag = 1; }
-| "%error-verbose" { error_verbose = 1; }
+| "%defines" { defines_flag = true; }
+| "%error-verbose" { error_verbose = true; }
| "%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; }
+| "%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 = 1; }
+| "%no-lines" { no_lines_flag = true; }
+| "%nondeterministic-parser" { nondeterministic_parser = true; }
| "%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; }
+| "%parse-param {...}" { add_param ("parse_param", $1, @1); }
+| "%pure-parser" { pure_parser = true; }
| "%skeleton" string_content { skeleton = $2; }
-| "%token-table" { token_table_flag = 1; }
-| "%verbose" { report_flag = 1; }
-| "%yacc" { yacc_flag = 1; }
+| "%token-table" { token_table_flag = true; }
+| "%verbose" { report_flag = report_states; }
+| "%yacc" { yacc_flag = true; }
+| /*FIXME: Err? What is this horror doing here? */ ";"
;
grammar_declaration:
{
grammar_start_symbol_set ($2, @2);
}
-| "%union" BRACED_CODE
+| "%union {...}"
+ {
+ typed = true;
+ MUSCLE_INSERT_INT ("stype_line", @1.start.line);
+ muscle_insert ("stype", $1);
+ }
+| "%destructor {...}" symbols.1
{
- typed = 1;
- MUSCLE_INSERT_INT ("stype_line", @2.first_line);
- muscle_insert ("stype", $2);
+ symbol_list *list;
+ for (list = $2; list; list = list->next)
+ symbol_destructor_set (list->sym, $1, @1);
+ symbol_list_free ($2);
}
-| "%destructor"
- { current_braced_code = destructor_braced_code; }
- BRACED_CODE symbols.1
+| "%printer {...}" symbols.1
{
- 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;
+ symbol_list *list;
+ for (list = $2; list; list = list->next)
+ symbol_printer_set (list->sym, $1, list->location);
+ symbol_list_free ($2);
}
-| "%printer"
- { current_braced_code = printer_braced_code; }
- BRACED_CODE symbols.1
+| "%default-prec"
{
- 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;
+ default_prec = true;
+ }
+| "%no-default-prec"
+ {
+ default_prec = false;
}
;
}
| "%type" TYPE symbols.1
{
- symbol_list_t *list;
+ symbol_list *list;
for (list = $3; list; list = list->next)
symbol_type_set (list->sym, $2, @2);
symbol_list_free ($3);
precedence_declaration:
precedence_declarator type.opt symbols.1
{
- symbol_list_t *list;
+ symbol_list *list;
++current_prec;
for (list = $3; list; list = list->next)
{
;
type.opt:
- /* Nothing. */ { current_type = NULL;}
+ /* Nothing. */ { current_type = NULL; }
| TYPE { current_type = $1; }
;
/* One or more symbol definitions. */
symbol_defs.1:
symbol_def
- {;}
| symbol_defs.1 symbol_def
- {;}
;
;
/* 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 ";"
;
rules:
- ID ":" { current_lhs = $1; current_lhs_location = @1; } rhses.1 ";"
- {;}
+ ID_COLON { current_lhs = $1; current_lhs_location = @1; } rhses.1
;
rhses.1:
rhs { grammar_rule_end (@1); }
| rhses.1 "|" rhs { grammar_rule_end (@3); }
+| rhses.1 ";"
;
rhs:
symbol:
ID { $$ = $1; }
| string_as_id { $$ = $1; }
-| CHARACTER { $$ = symbol_get ($1, @1); }
;
action:
epilogue.opt:
/* Nothing. */
- {
- $$ = xstrdup ("");
- }
| "%%" EPILOGUE
{
- $$ = $2;
+ muscle_code_grow ("epilogue", $2, @2);
+ 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;
+ loc.start = loc.end = rhs[n].end;
+
+ /* Ignore empty nonterminals the start of the 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;
+}
+
+
+/* Add a lex-param or a parse-param (depending on TYPE) with
+ declaration DECL and location LOC. */
static void
-yyprint (FILE *file,
- int type, const yystype *value)
+add_param (char const *type, char *decl, location loc)
+{
+ static char const alphanum[] =
+ "0123456789"
+ "abcdefghijklmnopqrstuvwxyz"
+ "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
+ "_";
+ char const *alpha = alphanum + 10;
+ char const *name_start = NULL;
+ char *p;
+
+ for (p = decl; *p; p++)
+ if ((p == decl || ! strchr (alphanum, p[-1])) && strchr (alpha, p[0]))
+ name_start = p;
+
+ /* Strip the surrounding '{' and '}'. */
+ decl++;
+ p[-1] = '\0';
+
+ if (! name_start)
+ complain_at (loc, _("missing identifier in parameter declaration"));
+ else
+ {
+ char *name;
+ size_t name_len;
+
+ for (name_len = 1;
+ name_start[name_len] && strchr (alphanum, name_start[name_len]);
+ name_len++)
+ continue;
+
+ name = xmalloc (name_len + 1);
+ memcpy (name, name_start, name_len);
+ name[name_len] = '\0';
+ muscle_pair_list_grow (type, decl, name);
+ free (name);
+ }
+
+ scanner_last_string_free ();
+}
+
+/*----------------------------------------------------.
+| When debugging the parser, display tokens' values. |
+`----------------------------------------------------*/
+
+static void
+print_token_value (FILE *file, int type, YYSTYPE const *value)
{
fputc (' ', file);
switch (type)
{
- case CHARACTER:
- fprintf (file, " = '%s'", value->string);
- break;
-
case ID:
fprintf (file, " = %s", value->symbol->tag);
break;
break;
case STRING:
- fprintf (file, " = \"%s\"", value->string);
+ fprintf (file, " = \"%s\"", value->chars);
break;
case TYPE:
- fprintf (file, " = <%s>", value->string);
+ fprintf (file, " = <%s>", value->uniqstr);
break;
case BRACED_CODE:
+ case PERCENT_DESTRUCTOR:
+ case PERCENT_LEX_PARAM:
+ case PERCENT_PARSE_PARAM:
+ case PERCENT_PRINTER:
+ case PERCENT_UNION:
case PROLOGUE:
case EPILOGUE:
- fprintf (file, " = {{ %s }}", value->string);
+ fprintf (file, " = {{ %s }}", value->chars);
+ break;
+
+ default:
+ fprintf (file, "unknown token type");
break;
}
}
-void
-gram_error (location_t *yylloc, const char *msg)
+static void
+gram_error (location const *loc, char const *msg)
+{
+ complain_at (*loc, "%s", msg);
+}
+
+char const *
+token_name (int type)
{
- complain_at (*yylloc, "%s", msg);
+ return yytname[type];
}
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