EXIT
[ IMMEDIATE
-: / /MOD DROP ;
-: MOD /MOD SWAP DROP ;
-: NEG 0 SWAP - ;
-
: IF IMMEDIATE
' 0BRANCH ,
HERE @
HERE @
;
+: AGAIN IMMEDIATE
+ ' BRANCH ,
+ HERE @ - , ;
+
+: ( IMMEDIATE
+ BEGIN
+ READ-WORD
+ 1 = IF
+ C@ 41 = IF
+ EXIT
+ THEN
+ ELSE
+ DROP
+ THEN
+ AGAIN ;
+
: UNTIL IMMEDIATE
' 0BRANCH ,
HERE @ - ,
;
-: FIB
- 0 1
- 0
+( Compile a literal value into the current word. )
+: LIT, IMMEDIATE ( x -- )
+ ' LIT , , ;
+
+: / /MOD DROP ;
+: MOD /MOD SWAP DROP ;
+: NEG 0 SWAP - ;
+
+: FIB ( n -- Fn )
+ 0 1 ( n a b )
+ 0 ( n a b i )
BEGIN
- ROT
- DUP ROT +
- ROT ROT
+ ROT ( n i a b )
+ DUP ROT + ( n i b a+b )
+ ROT ROT ( n b a+b i )
- 1 +
+ 1 + ( n b a+b i+1 )
DUP 4 PICK = UNTIL
- DROP SWAP DROP SWAP DROP
-;
+ DROP SWAP DROP SWAP DROP ; ( a+b )
: C,
HERE @ C!
HERE @ 1 +
HERE ! ;
-: OVER
- SWAP DUP ROT ;
+: OVER ( a b -- a b a ) SWAP DUP ROT ;
-: STORE-STRING
+( Compile the given string into the current word directly. )
+: STORE-STRING ( str len -- )
BEGIN
OVER C@ C,
SWAP 1 + SWAP
S" Hello!" DUP ROT
STORE-STRING
: HELLO
- ' HELLO-ADDR LIT [ , ] TELL NEWLINE ;
+ ' HELLO-ADDR LIT, TELL NEWLINE ;
HELLO
10 FIB .U
S" (Expected: 59)" TELL NEWLINE
+TERMINATE