-/* Bison Grammar Parser -*- C -*-
+%{/* Bison Grammar Parser -*- C -*-
- Copyright (C) 2002, 2003 Free Software Foundation, Inc.
+ Copyright (C) 2002, 2003, 2004, 2005, 2006 Free Software Foundation, Inc.
This file is part of Bison, the GNU Compiler Compiler.
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
+ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ 02110-1301 USA
*/
-
-%debug
-%defines
-%locations
-%pure-parser
-// %error-verbose
-%defines
-%name-prefix="gram_"
-
-%{
+#include <config.h>
#include "system.h"
#include "complain.h"
#include "getargs.h"
#include "gram.h"
#include "muscle_tab.h"
-#include "output.h"
+#include "quotearg.h"
#include "reader.h"
#include "symlist.h"
-
-/* Produce verbose syntax errors. */
-#define YYERROR_VERBOSE 1
+#include "strverscmp.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)
+
+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)
+ gram_error (&yylloc, Msg)
static void gram_error (location const *, char const *);
-#define YYPRINT(File, Type, 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;
-uniqstr current_type = 0;
-symbol *current_lhs;
-location current_lhs_location;
-assoc current_assoc;
-int current_prec = 0;
+static symbol_class current_class = unknown_sym;
+static uniqstr current_type = 0;
+static symbol *current_lhs;
+static location current_lhs_location;
+static int current_prec = 0;
+
+#ifdef UINT_FAST8_MAX
+# define YYTYPE_UINT8 uint_fast8_t
+#endif
+#ifdef INT_FAST8_MAX
+# define YYTYPE_INT8 int_fast8_t
+#endif
+#ifdef UINT_FAST16_MAX
+# define YYTYPE_UINT16 uint_fast16_t
+#endif
+#ifdef INT_FAST16_MAX
+# define YYTYPE_INT16 int_fast16_t
+#endif
%}
+%debug
+%verbose
+%defines
+%locations
+%pure-parser
+%error-verbose
+%defines
+%name-prefix="gram_"
+
+%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
`----------------------*/
%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_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"
+ PERCENT_DEBUG "%debug"
+ 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_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_REQUIRE "%require"
+ PERCENT_SKELETON "%skeleton"
+ PERCENT_START "%start"
+ PERCENT_TOKEN_TABLE "%token-table"
+ PERCENT_VERBOSE "%verbose"
+ PERCENT_YACC "%yacc"
;
%token TYPE "type"
%type <chars> STRING string_content
"%destructor {...}"
+ "%initial-action {...}"
+ "%lex-param {...}"
+ "%parse-param {...}"
+ "%printer {...}"
+ "%union {...}"
+ 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>", $$); } TYPE
%type <integer> INT
-%type <symbol> ID ID_COLON symbol string_as_id
+%printer { fprintf (stderr, "%d", $$); } 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 <assoc> precedence_declarator
%type <list> symbols.1
%%
declaration:
grammar_declaration
| PROLOGUE { prologue_augment ($1, @1); }
-| "%debug" { debug_flag = 1; }
+| "%debug" { debug_flag = true; }
+| "%define" string_content
+ {
+ static char one[] = "1";
+ muscle_insert ($2, one);
+ }
| "%define" string_content string_content { muscle_insert ($2, $3); }
-| "%defines" { defines_flag = 1; }
-| "%error-verbose" { error_verbose = 1; }
-| "%expect" INT { expected_conflicts = $2; }
+| "%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; }
-| "%glr-parser" { nondeterministic_parser = true;
- glr_parser = true; }
+| "%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 = 1; }
+| "%locations" { locations_flag = true; }
| "%name-prefix" "=" string_content { spec_name_prefix = $3; }
-| "%no-lines" { no_lines_flag = 1; }
-| "%nondeterministic-parser" { nondeterministic_parser = true; }
+| "%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); }
+| "%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 = 1; }
+| "%token-table" { token_table_flag = true; }
| "%verbose" { report_flag = report_states; }
-| "%yacc" { yacc_flag = 1; }
-| ";"
+| "%yacc" { yacc_flag = true; }
+| /*FIXME: Err? What is this horror doing here? */ ";"
;
grammar_declaration:
}
| "%union {...}"
{
- typed = 1;
- MUSCLE_INSERT_INT ("stype_line", @1.start.line);
- muscle_insert ("stype", $1);
+ char const *body = $1;
+
+ if (typed)
+ {
+ /* Concatenate the union bodies, turning the first one's
+ trailing '}' into '\n', and omitting the second one's '{'. */
+ char *code = muscle_find ("stype");
+ code[strlen (code) - 1] = '\n';
+ body++;
+ }
+
+ typed = true;
+ muscle_code_grow ("stype", body, @1);
}
| "%destructor {...}" symbols.1
{
{
symbol_list *list;
for (list = $2; list; list = list->next)
- symbol_printer_set (list->sym, $1, list->location);
+ symbol_printer_set (list->sym, $1, @1);
symbol_list_free ($2);
}
+| "%default-prec"
+ {
+ default_prec = true;
+ }
+| "%no-default-prec"
+ {
+ default_prec = false;
+ }
;
symbol_declaration:
}
| 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
{
- 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
{
- 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
{
- 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, $3, @$);
body of the grammar. */
rules_or_grammar_declaration:
rules
-| grammar_declaration
- {
- if (yacc_flag)
- complain_at (@$, _("POSIX forbids declarations in the grammar"));
- }
+| grammar_declaration ";"
| error ";"
{
yyerrok;
}
-| ";"
;
rules:
;
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 ";"
;
rhs:
/* Nothing. */
- { grammar_rule_begin (current_lhs, current_lhs_location); }
+ { grammar_current_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); }
| rhs "%prec" symbol
{ grammar_current_rule_prec_set ($3, @3); }
| rhs "%dprec" INT
| string_as_id { $$ = $1; }
;
+/* Handle the semantics of an action specially, with a mid-rule
+ action, so that grammar_current_rule_action_append is invoked
+ immediately after the braced code is read by the scanner.
+
+ This implementation relies on the LALR(1) parsing algorithm.
+ If grammar_current_rule_action_append were executed in a normal
+ action for this rule, then when the input grammar contains two
+ successive actions, the scanner would have to read both actions
+ before reducing this rule. That wouldn't work, since the scanner
+ relies on all preceding input actions being processed by
+ grammar_current_rule_action_append before it scans the next
+ action. */
action:
+ { grammar_current_rule_action_append (last_string, last_braced_code_loc); }
BRACED_CODE
- { $$ = $1; }
;
-/* A string used as an ID: we have to keep the quotes. */
+/* A string used as an ID: quote it. */
string_as_id:
STRING
{
- $$ = symbol_get ($1, @1);
- symbol_class_set ($$, token_sym, @1);
+ $$ = symbol_get (quotearg_style (c_quoting_style, $1), @1);
+ symbol_class_set ($$, token_sym, @1, false);
}
;
-/* A string used for its contents. Strip the quotes. */
+/* A string used for its contents. Don't quote it. */
string_content:
STRING
- {
- $$ = $1 + 1;
- $$[strlen ($$) - 1] = '\0';
- };
+ { $$ = $1; }
+;
epilogue.opt:
/* Nothing. */
| "%%" EPILOGUE
{
- epilogue_augment ($2, @2);
+ muscle_code_grow ("epilogue", $2, @2);
scanner_last_string_free ();
}
;
{
int i;
YYLTYPE loc;
- loc.start = loc.end = rhs[n].end;
+
+ /* 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 the right-hand side.
Do not bother to ignore them at the end of the right-hand side,
static void
add_param (char const *type, char *decl, location loc)
{
- static char const alphanum[] =
- "0123456789"
+ static char const alphanum[26 + 26 + 1 + 10] =
"abcdefghijklmnopqrstuvwxyz"
"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
- "_";
- char const *alpha = alphanum + 10;
+ "_"
+ "0123456789";
char const *name_start = NULL;
char *p;
- for (p = decl; *p; p++)
- if ((p == decl || ! strchr (alphanum, p[-1])) && strchr (alpha, p[0]))
+ /* 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 '}'. */
- decl++;
- p[-1] = '\0';
+ /* Strip the surrounding '{' and '}', and any blanks just inside
+ the braces. */
+ while (*--p == ' ' || *p == '\t')
+ continue;
+ p[1] = '\0';
+ while (*++decl == ' ' || *decl == '\t')
+ continue;
if (! name_start)
complain_at (loc, _("missing identifier in parameter declaration"));
size_t name_len;
for (name_len = 1;
- name_start[name_len] && strchr (alphanum, name_start[name_len]);
+ memchr (alphanum, name_start[name_len], sizeof alphanum);
name_len++)
continue;
scanner_last_string_free ();
}
-/*----------------------------------------------------.
-| When debugging the parser, display tokens' values. |
-`----------------------------------------------------*/
-
static void
-print_token_value (FILE *file, int type, YYSTYPE const *value)
+version_check (location const *loc, char const *version)
{
- fputc (' ', file);
- switch (type)
+ if (strverscmp (version, PACKAGE_VERSION) > 0)
{
- case ID:
- fprintf (file, " = %s", value->symbol->tag);
- break;
-
- case INT:
- fprintf (file, " = %d", value->integer);
- break;
-
- case STRING:
- fprintf (file, " = \"%s\"", value->chars);
- break;
-
- case TYPE:
- 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->chars);
- break;
-
- default:
- fprintf (file, "unknown token type");
- break;
+ complain_at (*loc, "require bison %s, but have %s",
+ version, PACKAGE_VERSION);
+ exit (63);
}
}
char const *
token_name (int type)
{
- return yytname[type];
+ return yytname[YYTRANSLATE (type)];
}
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