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forth: Word-ify "[']" and "'"

This commit is contained in:
Virgil Dupras 2020-03-17 16:02:01 -04:00
parent d91af99fde
commit b72901175e
2 changed files with 37 additions and 22 deletions

View File

@ -449,44 +449,57 @@ LITS:
ld (HERE), de
jp next
.db "'"
.fill 6
.db "(find)"
.fill 1
.dw LITS
.db 0
FIND:
FIND_:
.dw nativeWord
call readword
call find
jr z, .found
; not found
push hl
ld de, 0
.found:
push de
jp next
.found:
push de
ld de, 1
push de
jp next
.db "'"
.fill 6
.dw FIND_
.db 0
FIND:
.dw compiledWord
.dw FIND_
.dw CSKIP
.dw FINDERR
.dw EXIT
.db "[']"
.fill 4
.dw FIND
.db 0b01 ; IMMEDIATE
FINDI:
.dw nativeWord
call readword
call find
jr nz, .notfound
ld hl, (HERE)
push de ; --> lvl 1
ld de, NUMBER
call DEinHL
pop de ; <-- lvl 1
call DEinHL
ld (HERE), hl
jp next
.notfound:
ld hl, .msg
call printstr
jp abort
.msg:
.dw compiledWord
.dw FIND_
.dw CSKIP
.dw FINDERR
.dw LITN
.dw EXIT
.db 0b10 ; UNWORD
FINDERR:
.dw compiledWord
.dw DROP ; Drop str addr, we don't use it
.dw LIT
.db "word not found", 0
.dw PRINT
.dw ABORT
; ( -- c )
.db "KEY"

View File

@ -32,10 +32,12 @@ directly, but as part of another word.
"*I*" in description indicates an IMMEDIATE word.
*** Defining words ***
(find) x -- a f Read word x and find it in dict. If found, f=1 and
a = wordref. If not found, f=0 and a = string addr.
: x ... -- Define a new word
; R:I -- Exit a colon definition
, n -- Write n in HERE and advance it.
' x -- a Push addr of word x to a. If not found, push 0
' x -- a Push addr of word x to a. If not found, aborts
['] x -- *I* Like "'", but spits the addr as a number
literal. If not found, aborts.
( -- *I* Comment. Ignore rest of line until ")" is read.