collapseos/apps/forth/fmt.fs
2020-03-17 21:44:32 -04:00

47 lines
1021 B
Forth

( requires core, parse )
( TODO FORGET this word )
: PUSHDGTS
999 SWAP ( stop indicator )
DUP 0 = IF '0' EXIT THEN ( 0 is a special case )
BEGIN
DUP 0 = IF DROP EXIT THEN
10 /MOD ( r q )
SWAP '0' + SWAP ( d q )
AGAIN
;
: . ( n -- )
( handle negative )
( that "0 1 -" thing is because we don't parse negative
number correctly yet. )
DUP 0 < IF '-' EMIT 0 1 - * THEN
PUSHDGTS
BEGIN
DUP '9' > IF DROP EXIT THEN ( stop indicator, we're done )
EMIT
AGAIN
;
: PUSHDGTS
999 SWAP ( stop indicator )
DUP 0 = IF '0' EXIT THEN ( 0 is a special case )
BEGIN
DUP 0 = IF DROP EXIT THEN
16 /MOD ( r q )
SWAP ( r q )
DUP 9 > IF 10 - 'a' +
ELSE '0' + THEN ( q d )
SWAP ( d q )
AGAIN
;
: .X ( n -- )
( For hex display, there are no negatives )
PUSHDGTS
BEGIN
DUP 'f' > IF DROP EXIT THEN ( stop indicator, we're done )
EMIT
AGAIN
;