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Wrote integer arithmetic, conditional branch, loop

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Koichi Nakamura 2021-01-01 20:01:29 +09:00
parent 9dc6433850
commit aa8cf33242
1 changed files with 117 additions and 5 deletions
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122
core.fs
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@ -560,18 +560,130 @@ alias-builtin xor ^
: sp0 [ sp@ ] literal ; : sp0 [ sp@ ] literal ;
: rp0 [ rp@ ] literal ; : rp0 [ rp@ ] literal ;
bye
\ === Integer Arithmetic === \ === Integer Arithmetic ===
: 1+ 1 + ; : 1+ 1 + ;
: 1- 1 - ; : 1- 1 - ;
\ ( a b -- (a mod b) (a / b) \ ( a b -- (a mod b) (a / b) )
: /mod o o / { mod } ; : /mod 2dup mod -rot / ;
\ ( n -- -n ) \ ( n -- -n )
: negate 0 ~ - ; : negate 0 swap - ;
\ ( n1 -- n2 )
: not false = ;
: > swap < ;
: <= > not ;
: >= < not ;
: <> = not ;
: 0= 0 = ;
: 0<> 0 <> ;
: 0< 0 < ;
: 0> 0 > ;
: 0<= 0 <= ;
: 0>= 0 >= ;
\ ( a b c -- (a<=c & c<b) )
: within tuck > -rot <= and ;
\ === Conditional Branch ===
\ <condition> if <if-true> then
\ <condition> if <if-true> else <if-false> then
\ <condition> unless <if-false> then
\ <condition> unless <if-false> else <if-true> then
\ compile: ( -- orig )
\ runtime: ( n -- )
: if
compile 0branch
here @ 0 , \ save location of offset, fill dummy
; immediate
\ compile: ( orig -- )
\ runtime: ( -- )
: then
here @ \ ( orig dest )
over - \ ( orig offset )
swap ! \ fill offset to orig
; immediate
\ compile: ( orig1 -- orig2 )
\ runtime: ( -- )
: else
compile branch
here @ 0 , \ save location of offset, fill dummy
swap
\ fill offset, here-orig1, to orig1
here @
over -
swap !
; immediate
\ compile: ( -- orig )
\ runtime: ( n -- )
: unless
compile not
[compile] if
; immediate
\ === Loops ===
\ begin <body> <condition> until
\ begin <body> again
\ begin <condition> while <body> repeat
\ compile: ( -- dest )
\ runtime: ( -- )
: begin
here @ \ save location
; immediate
\ compile: ( dest -- )
\ runtime: ( n -- )
: until
compile 0branch
here @ - , \ fill offset
; immediate
\ compile: ( dest -- )
\ runtime: ( -- )
: again
compile branch
here @ - , \ fill offset
; immediate
\ compile: ( dest -- dest orig )
\ runtime: ( n -- )
\ dest=location of begin
\ orig=location of while
: while
compile 0branch
here @ 0 , \ save location, fill dummy
; immediate
\ compile: ( dest orig -- )
\ runtime: ( -- )
\ dest=location of begin
\ orig=location of while
: repeat
swap
compile branch
here @ - , \ fill offset from here to begin
here @ over - swap ! \ backfill offset from while to here
; immediate
:noname
begin
1
while
[ key A ] literal emit
repeat
; execute
bye
\ === Integer Comparison === \ === Integer Comparison ===