77 lines
1.4 KiB
Plaintext
77 lines
1.4 KiB
Plaintext
|
%{
|
||
|
|
#include <stdlib.h>
|
||
|
|
|
||
|
|
typedef enum {cGLOBAL, cLOCAL} class;
|
||
|
|
typedef enum {tREAL, tINTEGER} type;
|
||
|
|
typedef char * name;
|
||
|
|
|
||
|
|
struct symbol { class c; type t; name id; };
|
||
|
|
typedef struct symbol symbol;
|
||
|
|
|
||
|
|
struct namelist { symbol *s; struct namelist *next; };
|
||
|
|
typedef struct namelist namelist;
|
||
|
|
|
||
|
|
extern symbol *mksymbol(type t, class c, name id);
|
||
|
|
|
||
|
|
#ifdef YYBISON
|
||
|
|
#define YYLEX_DECL() yylex(void)
|
||
|
|
#define YYERROR_DECL() yyerror(const char *s)
|
||
|
|
extern int YYLEX_DECL();
|
||
|
|
extern void YYERROR_DECL();
|
||
|
|
#endif
|
||
|
|
%}
|
||
|
|
|
||
|
|
%token <cval> GLOBAL LOCAL
|
||
|
|
%token <tval> REAL INTEGER
|
||
|
|
%token <id> NAME
|
||
|
|
|
||
|
|
%type <nlist> declaration namelist locnamelist
|
||
|
|
%type <cval> class
|
||
|
|
%type <tval> type
|
||
|
|
|
||
|
|
%union
|
||
|
|
{
|
||
|
|
class cval;
|
||
|
|
type tval;
|
||
|
|
namelist * nlist;
|
||
|
|
name id;
|
||
|
|
}
|
||
|
|
|
||
|
|
%start declaration
|
||
|
|
|
||
|
|
%%
|
||
|
|
declaration: class type namelist
|
||
|
|
{ $$ = $3; }
|
||
|
|
| type locnamelist
|
||
|
|
{ $$ = $2; }
|
||
|
|
;
|
||
|
|
|
||
|
|
class : GLOBAL { $$ = cGLOBAL; }
|
||
|
|
| LOCAL { $$ = cLOCAL; }
|
||
|
|
;
|
||
|
|
|
||
|
|
type : REAL { $$ = tREAL; }
|
||
|
|
| INTEGER { $$ = tINTEGER; }
|
||
|
|
;
|
||
|
|
|
||
|
|
namelist: namelist NAME
|
||
|
|
{ $$->s = mksymbol($<tval>0, $<cval>-1, $2);
|
||
|
|
$$->next = $1;
|
||
|
|
}
|
||
|
|
| NAME
|
||
|
|
{ $$->s = mksymbol($<tval>0, $<cval>-1, $1);
|
||
|
|
$$->next = NULL;
|
||
|
|
}
|
||
|
|
;
|
||
|
|
|
||
|
|
locnamelist:
|
||
|
|
{ $<cval>$ = cLOCAL; } /* set up semantic stack for <class> = LOCAL */
|
||
|
|
{ $<tval>$ = $<tval>-1; } /* copy <type> to where <namelist> expects it */
|
||
|
|
namelist
|
||
|
|
{ $$ = $3; }
|
||
|
|
;
|
||
|
|
%%
|
||
|
|
|
||
|
|
extern int YYLEX_DECL();
|
||
|
|
extern void YYERROR_DECL();
|