external/bsd/byacc/dist/test/inherit2.y

   1 /*      $NetBSD: inherit2.y,v 1.1.1.1 2015/01/03 22:58:23 christos Exp $        */
   2
   3 %{
   4 #include <stdlib.h>
   5
   6 typedef enum {cGLOBAL, cLOCAL} class;
   7 typedef enum {tREAL, tINTEGER} type;
   8 typedef char * name;
   9
  10 struct symbol { class c; type t; name id; };
  11 typedef struct symbol symbol;
  12
  13 struct namelist { symbol *s; struct namelist *next; };
  14 typedef struct namelist namelist;
  15
  16 extern symbol *mksymbol(type t, class c, name id);
  17
  18 #ifdef YYBISON
  19 #define YYLEX_DECL() yylex(void)
  20 #define YYERROR_DECL() yyerror(const char *s)
  21 #endif
  22 %}
  23
  24 %token <cval> GLOBAL LOCAL
  25 %token <tval> REAL INTEGER
  26 %token <id>   NAME
  27
  28 %type <nlist> declaration namelist(<cval>, <tval>) locnamelist(<tval>)
  29 %type <cval>  class
  30 %type <tval>  type
  31
  32 %destructor     {
  33                   namelist *p = $$;
  34                   while (p != NULL)
  35                   { namelist *pp = p;
  36                     p = p->next;
  37                     free(pp->s); free(pp);
  38                   }
  39                 } <nlist>
  40
  41 %union
  42 {
  43     class       cval;
  44     type        tval;
  45     namelist *  nlist;
  46     name        id;
  47 }
  48
  49 %start declaration
  50
  51 %%
  52 declaration: class type namelist($1, $2)
  53         { $$ = $3; }
  54         | type locnamelist($1)
  55         { $$ = $2; }
  56         ;
  57
  58 class   : GLOBAL { $$ = cGLOBAL; }
  59         | LOCAL  { $$ = cLOCAL; }
  60         ;
  61
  62 type    : REAL    { $$ = tREAL; }
  63         | INTEGER { $$ = tINTEGER; }
  64         ;
  65
  66 namelist($c, $t): namelist NAME
  67             { $$->s = mksymbol($<tval>t, $<cval>c, $2);
  68               $$->next = $1;
  69             }
  70         | NAME
  71             { $$->s = mksymbol($t, $c, $1);
  72               $$->next = NULL;
  73             }
  74         ;
  75
  76 locnamelist($t): namelist(cLOCAL, $t)
  77         { $$ = $1; }
  78         ;
  79 %%
  80
  81 extern int YYLEX_DECL();
  82 extern void YYERROR_DECL();