1 %{
2 #include <stdlib.h>
3
4 typedef enum {cGLOBAL, cLOCAL} class;
5 typedef enum {tREAL, tINTEGER} type;
6 typedef char * name;
7
8 struct symbol { class c; type t; name id; };
9 typedef struct symbol symbol;
10
11 struct namelist { symbol *s; struct namelist *next; };
12 typedef struct namelist namelist;
13
14 extern symbol *mksymbol(type t, class c, name id);
15
16 #ifdef YYBISON
17 #define YYLEX_DECL() yylex(void)
18 #define YYERROR_DECL() yyerror(const char *s)
19 #endif
20 %}
21
22 %token <cval> GLOBAL LOCAL
23 %token <tval> REAL INTEGER
24 %token <id> NAME
25
26 %type <nlist> declaration(<id>) namelist(<cval>, <tval>) locnamelist(<tval>)
27 %type <cval> class
28 %type <tval> type
29
30 %destructor {
31 namelist *p = $$;
32 while (p != NULL)
33 { namelist *pp = p;
34 p = p->next;
35 free(pp->s); free(pp);
36 }
37 } <nlist>
38
39 %union
40 {
41 class cval;
42 type tval;
43 namelist * nlist;
44 name id;
45 }
46
47 %start declaration
48
49 %%
50 declaration($d): class type namelist($1, $2)
51 { $$ = $3; }
52 | type locnamelist($1)
53 { $$ = $2; }
54 ;
55
56 class : GLOBAL { $$ = cGLOBAL; }
57 | LOCAL { $$ = cLOCAL; }
58 ;
59
60 type : REAL { $$ = tREAL; }
61 | INTEGER { $$ = tINTEGER; }
62 ;
63
namelist($c)64 namelist: namelist($c) NAME
65 { $$->s = mksymbol($<tval>t, $<cval>c, $2);
66 $$->next = $1;
67 }
68 | NAME
69 { $$->s = mksymbol($t, $c, $1);
70 $$->next = NULL;
71 }
72 ;
73
locnamelist($t)74 locnamelist($t): namelist(cLOCAL, $t)
75 { $$ = $1; }
76 ;
77 %%
78
79 extern int YYLEX_DECL();
80 extern void YYERROR_DECL();
81