/* 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 "reader.h"
#include "symlist.h"
-/* Produce verbose syntax errors. */
-#define YYERROR_VERBOSE 1
-
#define YYLLOC_DEFAULT(Current, Rhs, N) (Current) = lloc_default (Rhs, N)
static YYLTYPE lloc_default (YYLTYPE const *, int);
print_token_value (File, Type, &Value)
static void print_token_value (FILE *, int, YYSTYPE const *);
-static void add_param (char const *, char const *, location);
+static void add_param (char const *, char *, location);
symbol_class current_class = unknown_sym;
uniqstr current_type = 0;
location current_lhs_location;
assoc current_assoc;
int current_prec = 0;
-braced_code 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
%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"
%type <chars> STRING string_content
- BRACED_CODE code_content action
+ "%destructor {...}"
+ "%initial-action {...}"
+ "%lex-param {...}"
+ "%parse-param {...}"
+ "%printer {...}"
+ "%union {...}"
+ BRACED_CODE action
PROLOGUE EPILOGUE
%type <uniqstr> TYPE
%type <integer> INT
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" code_content { add_param ("lex_param", $2, @2); }
-| "%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" code_content { add_param ("parse_param", $2, @2); }
-| "%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 = 1;
- MUSCLE_INSERT_INT ("stype_line", @2.start.line);
- muscle_insert ("stype", $2);
+ typed = true;
+ MUSCLE_INSERT_INT ("stype_line", @1.start.line);
+ muscle_insert ("stype", $1);
}
-| "%destructor"
- { current_braced_code = destructor_braced_code; }
- BRACED_CODE symbols.1
+| "%destructor {...}" symbols.1
{
symbol_list *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;
+ for (list = $2; list; list = list->next)
+ symbol_destructor_set (list->sym, $1, @1);
+ symbol_list_free ($2);
}
-| "%printer"
- { current_braced_code = printer_braced_code; }
- BRACED_CODE symbols.1
+| "%printer {...}" symbols.1
{
symbol_list *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;
+ for (list = $2; list; list = list->next)
+ symbol_printer_set (list->sym, $1, list->location);
+ symbol_list_free ($2);
+ }
+| "%default-prec"
+ {
+ default_prec = true;
+ }
+| "%no-default-prec"
+ {
+ default_prec = false;
}
;
body of the grammar. */
rules_or_grammar_declaration:
rules
-| grammar_declaration
+| grammar_declaration ";"
{
if (yacc_flag)
complain_at (@$, _("POSIX forbids declarations in the grammar"));
{
yyerrok;
}
-| ";"
;
rules:
rhses.1:
rhs { grammar_rule_end (@1); }
| rhses.1 "|" rhs { grammar_rule_end (@3); }
+| rhses.1 ";"
;
rhs:
};
-/* A BRACED_CODE used for its contents. Strip the braces. */
-code_content:
- BRACED_CODE
- {
- $$ = $1 + 1;
- $$[strlen ($$) - 1] = '\0';
- };
-
-
epilogue.opt:
/* Nothing. */
| "%%" EPILOGUE
{
- epilogue_augment ($2, @2);
+ muscle_code_grow ("epilogue", $2, @2);
scanner_last_string_free ();
}
;
lloc_default (YYLTYPE const *rhs, int n)
{
int i;
- int j;
- YYLTYPE r;
- r.start = r.end = rhs[n].end;
+ 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))
{
- r.start = rhs[i].start;
-
- for (j = n; i < j; j--)
- if (! equal_boundaries (rhs[j].start, rhs[j].end))
- break;
- r.end = rhs[j].end;
-
+ loc.start = rhs[i].start;
break;
}
- return r;
+ return loc;
}
declaration DECL and location LOC. */
static void
-add_param (char const *type, char const *decl, location loc)
+add_param (char const *type, char *decl, location loc)
{
static char const alphanum[] =
"0123456789"
"_";
char const *alpha = alphanum + 10;
char const *name_start = NULL;
- char const *p;
+ 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
scanner_last_string_free ();
}
-/*------------------------------------------------------------------.
-| When debugging the parser, display tokens' locations and values. |
-`------------------------------------------------------------------*/
+/*----------------------------------------------------.
+| When debugging the parser, display tokens' values. |
+`----------------------------------------------------*/
static void
print_token_value (FILE *file, int type, YYSTYPE const *value)
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);
{
complain_at (*loc, "%s", msg);
}
+
+char const *
+token_name (int type)
+{
+ return yytname[type];
+}
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