collapseos/blk/387

( handle backspace: go back one char in IN>, if possible, then
  emit BS + SPC + BS )
: _bs
    ( already at IN( ? )
    IN> @ IN( = IF EXIT THEN
    IN> @ 1- IN> !
    BS SPC BS
;
( del is same as backspace )
: BS? DUP 0x7f = SWAP 0x8 = OR ;

: KEY
    0x55 RAM+ @ ( (key) override )
    ?DUP IF EXECUTE ELSE (key) THEN ;
( cont.: read one char into input buffer and returns whether we
  should continue, that is, whether CR was not met. )
Move core's readln to xcomp core (high) 2020-05-13 09:28:32 -04:00			`( handle backspace: go back one char in IN>, if possible, then`
Don't emit BS when at beginning of input buffer 2020-05-15 20:51:09 -04:00			`emit BS + SPC + BS )`
VE: add backspace support in replace mode 2020-06-11 22:29:05 -04:00			`: _bs`
Move core's readln to xcomp core (high) 2020-05-13 09:28:32 -04:00			`( already at IN( ? )`
			`IN> @ IN( = IF EXIT THEN`
			`IN> @ 1- IN> !`
Don't emit BS when at beginning of input buffer 2020-05-15 20:51:09 -04:00			`BS SPC BS`
Move core's readln to xcomp core (high) 2020-05-13 09:28:32 -04:00			`;`
VE: add backspace support in replace mode 2020-06-11 22:29:05 -04:00			`( del is same as backspace )`
			`: BS? DUP 0x7f = SWAP 0x8 = OR ;`
Move core's readln to xcomp core (high) 2020-05-13 09:28:32 -04:00
			`: KEY`
z80: fix tricky memory initialization issue Among random "better safe than sorry" changes, the real fix is in changing "4" for "5" above _find declaration. This off-by-one error had that word, which is the root word in z80, have a 0x01 prev field instead of a 0x00 one. When all memory was initialized to zero, it didn't matter, we ended up hitting 0 prev and considered ourselves properly at the end of dict. When memory wasn't initialized, however, we would end up jumping at all kinds of places, leading to random behavior. 2020-08-15 16:37:58 -04:00			`0x55 RAM+ @ ( (key) override )`
Add word ?DUP 2020-05-22 13:48:30 -04:00			`?DUP IF EXECUTE ELSE (key) THEN ;`
Move core's readln to xcomp core (high) 2020-05-13 09:28:32 -04:00			`( cont.: read one char into input buffer and returns whether we`
			`should continue, that is, whether CR was not met. )`