Annotation of gforth/toolsext.fs, revision 1.5
1.4 pazsan 1: \ Interpretative Structuren 16feb92py
1.1 anton 2:
1.4 pazsan 3: Variable countif
1.1 anton 4:
1.4 pazsan 5: : dummy ; immediate
6: : >exec >r ; restrict ( :-)
7: : scanIF f83find dup 0= IF drop ['] dummy >name THEN ;
8:
9: Create [struct]-search ' scanIF A, ' (reveal) A, ' drop A,
10: Create [struct]-voc NIL A, G [struct]-search T A,
11: NIL A, NIL A,
12:
13: : ?if countif @ 0<
14: IF [ [struct]-voc 3 cells + ] ALiteral @ lookup ! THEN ;
15:
16: UNLOCK Tlast @ NIL Tlast ! LOCK
17:
18: : [IF] 1 countif +! ?if ; immediate
19: : [THEN] -1 countif +! ?if ; immediate
20: : [ELSE] postpone [THEN] r> >exec postpone [IF] ;
21: immediate
22: ' [IF] Alias [IFDEF] immediate
23: ' [IF] Alias [IFUNDEF] immediate
1.5 ! anton 24: ' [THEN] Alias [ENDIF] immediate
1.4 pazsan 25: ' [IF] Alias [BEGIN] immediate
26: ' [IF] Alias [WHILE] immediate
27: ' [THEN] Alias [UNTIL] immediate
28: ' [THEN] Alias [AGAIN] immediate
29: ' [IF] Alias [DO] immediate
30: ' [IF] Alias [?DO] immediate
31: ' [THEN] Alias [LOOP] immediate
32: ' [THEN] Alias [+LOOP] immediate
33: : [REPEAT] postpone [AGAIN] postpone [THEN] ;
34: immediate
35: ' ( Alias ( immediate
36: ' \ Alias \ immediate
37:
38: UNLOCK Tlast @ swap Tlast ! LOCK
39: 1 cells - G [struct]-voc T !
40:
41: \ Interpretative Structuren 30apr92py
42:
43: : defined bl word find nip 0<> ; immediate
44: : [IF] 0= IF countif off
45: lookup @ [ [struct]-voc 3 cells + ] ALiteral !
46: [struct]-voc lookup !
47: THEN ; immediate
48: : [IFDEF] postpone defined postpone [IF] ; immediate
49: : [IFUNDEF] postpone defined 0= postpone [IF] ; immediate
50: : [ELSE] 0 postpone [IF] ; immediate
51: : [THEN] ; immediate
1.5 ! anton 52: : [ENDIF] ; immediate
1.4 pazsan 53:
54: \ Structs for interpreter 28nov92py
55:
56: User (i)
57:
58: : [DO] ( start end -- ) >in @ -rot
59: DO I (i) ! dup >r >in ! interpret r> swap +LOOP drop ;
60: immediate
61: : [?DO] 2dup = IF 2drop postpone [ELSE] ELSE postpone [DO] THEN ;
62: immediate
63: : [+LOOP] ( n -- ) rdrop rdrop ; immediate
64: : [LOOP] ( -- ) 1 rdrop rdrop ; immediate
65: : [FOR] ( n -- ) 0 swap postpone [DO] ; immediate
66: : [NEXT] ( n -- ) -1 rdrop rdrop ; immediate
67: : [I] ( -- index ) (I) @ postpone Literal ; immediate
68: : [BEGIN] >in @ >r BEGIN r@ >in ! interpret UNTIL rdrop ;
69: immediate
70: ' [+LOOP] Alias [UNTIL] immediate
71: : [REPEAT] ( -- ) false rdrop rdrop ; immediate
72: ' [REPEAT] Alias [AGAIN] immediate
73: : [WHILE] ( flag -- )
74: 0= IF postpone [ELSE] true rdrop rdrop 1 countif +! THEN ;
75: immediate
1.1 anton 76:
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