%defines
%locations
%pure-parser
-%error-verbose
+// %error-verbose
%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
correctly typed access to it. */
#define yycontrol ((gram_control_t *) gram_control)
-/* Request detailed parse error messages, and pass them to
- GRAM_ERROR. */
+/* 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 (yycontrol, &yylloc, Msg)
+ gram_error (&yylloc, Msg)
-/* When debugging our pure parser, we want to see values and locations
- of the tokens. */
#define YYPRINT(File, Type, Value) \
- yyprint (File, &yylloc, Type, &Value)
-static void yyprint (FILE *file, const yyltype *loc,
- int type, const yystype *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;
-associativity current_assoc;
+location_t current_lhs_location;
+assoc_t current_assoc;
int current_prec = 0;
+braced_code_t current_braced_code = action_braced_code;
%}
%union
{
symbol_t *symbol;
+ symbol_list_t *list;
int integer;
char *string;
- associativity assoc;
+ assoc_t assoc;
};
-/* Define the tokens together with there human representation. */
+/* Define the tokens together with their human representation. */
%token GRAM_EOF 0 "end of string"
%token STRING CHARACTER
%token INT
-%token PERCENT_TOKEN "%token"
-%token PERCENT_NTERM "%nterm"
-%token PERCENT_TYPE "%type"
-%token PERCENT_UNION "%union"
+%token PERCENT_TOKEN "%token"
+%token PERCENT_NTERM "%nterm"
+
+%token PERCENT_TYPE "%type"
+%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_EXPECT "%expect"
%token PERCENT_START "%start"
-%token PERCENT_LEFT "%left"
-%token PERCENT_RIGHT "%right"
-%token PERCENT_NONASSOC "%nonassoc"
%token PERCENT_PREC "%prec"
+%token PERCENT_DPREC "%dprec"
+%token PERCENT_MERGE "%merge"
%token PERCENT_VERBOSE "%verbose"
%token PERCENT_ERROR_VERBOSE "%error-verbose"
%token PERCENT_DEFINE "%define"
%token PERCENT_PURE_PARSER "%pure-parser"
+%token PERCENT_GLR_PARSER "%glr-parser"
%token PERCENT_DEFINES "%defines"
%token PROLOGUE EPILOGUE
%token BRACED_CODE
-%type <string> CHARACTER TYPE BRACED_CODE PROLOGUE EPILOGUE epilogue.opt action STRING string_content
+%type <string> CHARACTER TYPE STRING string_content
+ BRACED_CODE PROLOGUE EPILOGUE epilogue.opt action
%type <integer> INT
%type <symbol> ID symbol string_as_id
-%type <assoc> precedence_directive
+%type <assoc> precedence_declarator
+%type <list> symbols.1
%%
-input: { LOCATION_RESET (yylloc); }
- directives "%%" gram epilogue.opt
+
+input:
+ declarations "%%" grammar epilogue.opt
{
yycontrol->errcode = 0;
- epilogue_set ($5, @5.first_line);
+ epilogue_set ($4, @4);
}
;
-directives:
+
+ /*------------------------------------.
+ | Declarations: before the first %%. |
+ `------------------------------------*/
+
+declarations:
/* Nothing */
-| directives directive
+| declarations declaration semi_colon.opt
;
-directive:
- grammar_directives
-| PROLOGUE { prologue_augment ($1, @1.first_line); }
+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; }
| "%no-lines" { no_lines_flag = 1; }
| "%output" "=" string_content { spec_outfile = $3; }
| "%pure-parser" { pure_parser = 1; }
+| "%glr-parser" { glr_parser = 1; }
| "%skeleton" string_content { skeleton = $2; }
| "%token-table" { token_table_flag = 1; }
| "%verbose" { report_flag = 1; }
| "%yacc" { yacc_flag = 1; }
;
-grammar_directives:
- precedence_directives
-| "%nterm" { current_class = nterm_sym; } symbol_defs.1
+grammar_declaration:
+ precedence_declaration
+| symbol_declaration
+| "%start" symbol
{
- current_class = unknown_sym;
- current_type = NULL;
+ grammar_start_symbol_set ($2, @2);
}
-| "%start" symbol
+| "%union" BRACED_CODE
{
- grammar_start_symbol_set ($2);
+ typed = 1;
+ MUSCLE_INSERT_INT ("stype_line", @2.first_line);
+ muscle_insert ("stype", $2);
}
-| "%token" { current_class = token_sym; } symbol_defs.1
+| "%destructor"
+ { current_braced_code = destructor_braced_code; }
+ BRACED_CODE 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;
+ }
+| "%printer"
+ { current_braced_code = printer_braced_code; }
+ BRACED_CODE symbols.1
+ {
+ 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;
+ }
+;
+
+symbol_declaration:
+ "%nterm" { current_class = nterm_sym; } symbol_defs.1
{
current_class = unknown_sym;
current_type = NULL;
}
-| "%type" TYPE {current_type = $2; } nterms_to_type.1
+| "%token" { current_class = token_sym; } symbol_defs.1
{
+ current_class = unknown_sym;
current_type = NULL;
}
-| "%union" BRACED_CODE semi_colon_opt
+| "%type" TYPE symbols.1
{
- typed = 1;
- MUSCLE_INSERT_INT ("stype_line", @2.first_line);
- muscle_insert ("stype", $2);
+ symbol_list_t *list;
+ for (list = $3; list; list = list->next)
+ symbol_type_set (list->sym, $2, @2);
+ symbol_list_free ($3);
}
;
-precedence_directives:
- precedence_directive type.opt
- { current_assoc = $1; ++current_prec; }
- terms_to_prec.1
- { current_assoc = non_assoc; current_type = NULL; }
+precedence_declaration:
+ precedence_declarator type.opt symbols.1
+ {
+ symbol_list_t *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_list_free ($3);
+ current_type = NULL;
+ }
;
-precedence_directive:
+precedence_declarator:
"%left" { $$ = left_assoc; }
| "%right" { $$ = right_assoc; }
| "%nonassoc" { $$ = non_assoc; }
;
/* One or more nonterminals to be %typed. */
-nterms_to_type.1:
- ID { symbol_type_set ($1, current_type); }
-| nterms_to_type.1 ID { symbol_type_set ($2, current_type); }
-;
-/* One or more symbols to be given a precedence/associativity. */
-terms_to_prec.1:
- symbol
- {
- symbol_type_set ($1, current_type);
- symbol_precedence_set ($1, current_prec, current_assoc);
- }
-| terms_to_prec.1 symbol
- {
- symbol_type_set ($2, current_type);
- symbol_precedence_set ($2, current_prec, current_assoc);
- }
+symbols.1:
+ symbol { $$ = symbol_list_new ($1, @1); }
+| symbols.1 symbol { $$ = symbol_list_prepend ($1, $2, @2); }
;
-
/* One token definition. */
symbol_def:
TYPE
}
| ID
{
- symbol_class_set ($1, current_class);
- symbol_type_set ($1, current_type);
+ symbol_class_set ($1, current_class, @1);
+ symbol_type_set ($1, current_type, @1);
}
| ID INT
{
- symbol_class_set ($1, current_class);
- symbol_type_set ($1, current_type);
- symbol_user_token_number_set ($1, $2);
+ symbol_class_set ($1, current_class, @1);
+ 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);
- symbol_type_set ($1, current_type);
- symbol_make_alias ($1, $2);
+ symbol_class_set ($1, current_class, @1);
+ symbol_type_set ($1, current_type, @1);
+ symbol_make_alias ($1, $2, @$);
}
| ID INT string_as_id
{
- symbol_class_set ($1, current_class);
- symbol_type_set ($1, current_type);
- symbol_user_token_number_set ($1, $2);
- symbol_make_alias ($1, $3);
+ symbol_class_set ($1, current_class, @1);
+ symbol_type_set ($1, current_type, @1);
+ symbol_user_token_number_set ($1, $2, @2);
+ symbol_make_alias ($1, $3, @$);
}
;
{;}
;
-gram:
+
+ /*------------------------------------------.
+ | The grammar section: between the two %%. |
+ `------------------------------------------*/
+
+grammar:
+ rules_or_grammar_declaration
+| 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. */
+rules_or_grammar_declaration:
rules
-| gram rules
+| grammar_declaration ";"
+ {
+ if (yacc_flag)
+ complain_at (@$, _("POSIX forbids declarations in the grammar"));
+ }
+| error ";"
+ {
+ yyerrok;
+ }
;
rules:
- ID ":" { current_lhs = $1; } rhses.1 ";"
+ ID ":" { current_lhs = $1; current_lhs_location = @1; } rhses.1 ";"
{;}
;
rhses.1:
- rhs { grammar_rule_end (); }
-| rhses.1 "|" rhs { grammar_rule_end (); }
+ rhs { grammar_rule_end (@1); }
+| rhses.1 "|" rhs { grammar_rule_end (@3); }
;
rhs:
/* Nothing. */
- { grammar_rule_begin (current_lhs); }
+ { grammar_rule_begin (current_lhs, current_lhs_location); }
| rhs symbol
- { grammar_current_rule_symbol_append ($2); }
+ { grammar_current_rule_symbol_append ($2, @2); }
| rhs action
- { grammar_current_rule_action_append ($2, @2.first_line); }
+ { grammar_current_rule_action_append ($2, @2); }
| rhs "%prec" symbol
- { grammar_current_rule_prec_set ($3); }
+ { grammar_current_rule_prec_set ($3, @3); }
+| rhs "%dprec" INT
+ { grammar_current_rule_dprec_set ($3, @3); }
+| rhs "%merge" TYPE
+ { grammar_current_rule_merge_set ($3, @3); }
;
symbol:
ID { $$ = $1; }
| string_as_id { $$ = $1; }
-| CHARACTER { $$ = getsym ($1); }
+| CHARACTER { $$ = symbol_get ($1, @1); }
;
action:
string_as_id:
STRING
{
- $$ = getsym ($1);
- symbol_class_set ($$, token_sym);
+ $$ = symbol_get ($1, @1);
+ symbol_class_set ($$, token_sym, @1);
}
;
}
;
-semi_colon_opt:
+semi_colon.opt:
/* Nothing. */
| ";"
;
static void
yyprint (FILE *file,
- const yyltype *loc, int type, const yystype *value)
+ int type, const yystype *value)
{
- fputs (" (", file);
- LOCATION_PRINT (file, *loc);
- fputs (")", file);
+ fputc (' ', file);
switch (type)
{
case CHARACTER:
}
void
-gram_error (gram_control_t *control ATTRIBUTE_UNUSED,
- yyltype *yylloc, const char *msg)
+gram_error (location_t *yylloc, const char *msg)
{
- LOCATION_PRINT (stderr, *yylloc);
- fprintf (stderr, ": %s\n", msg);
+ complain_at (*yylloc, "%s", msg);
}
projects / bison.git / blobdiff