collapseos/forth/core.fs

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: H HERE @ ;
: -^ SWAP - ;
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: [LITN] LITN ; IMMEDIATE
: LIT ROUTINE S [LITN] , ;
: LITS LIT SCPY ;
: LIT< WORD LITS ; IMMEDIATE
: COMPILE ' LITN ['] , , ; IMMEDIATE
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: [COMPILE] ' , ; IMMEDIATE
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: BEGIN H ; IMMEDIATE
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: AGAIN COMPILE (bbr) H -^ C, ; IMMEDIATE
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: UNTIL COMPILE SKIP? COMPILE (bbr) H -^ C, ; IMMEDIATE
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: ( BEGIN LIT< ) WORD SCMP NOT UNTIL ; IMMEDIATE
( Hello, hello, krkrkrkr... do you hear me?
Ah, voice at last! Some lines above need comments
BTW: Forth lines limited to 64 cols because of default
input buffer size in Collapse OS
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COMPILE: Tough one. Get addr of caller word (example above
(bbr)) and then call LITN on it. )
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: +! SWAP OVER @ + SWAP ! ;
: ALLOT HERE +! ;
: IF ( -- a | a: br cell addr )
COMPILE SKIP? ( if true, don't branch )
COMPILE (fbr)
H ( push a )
1 ALLOT ( br cell allot )
; IMMEDIATE
: THEN ( a -- | a: br cell addr )
DUP H -^ SWAP ( a-H a )
C!
; IMMEDIATE
: ELSE ( a1 -- a2 | a1: IF cell a2: ELSE cell )
COMPILE (fbr)
1 ALLOT
DUP H -^ SWAP ( a-H a )
C!
H 1 - ( push a. -1 for allot offset )
; IMMEDIATE
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: CREATE
(entry) ( empty header with name )
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ROUTINE C [LITN] ( push cellWord addr )
, ( write it )
;
: VARIABLE CREATE 2 ALLOT ;
: CONSTANT CREATE H ! DOES> @ ;
: = CMP NOT ;
: < CMP 0 1 - = ;
: > CMP 1 = ;
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: / /MOD SWAP DROP ;
: MOD /MOD DROP ;
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( In addition to pushing H this compiles 2 >R so that loop
variables are sent to PS at runtime )
: DO
COMPILE SWAP COMPILE >R COMPILE >R
H
; IMMEDIATE
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( One could think that we should have a sub word to avoid all
these COMPILE, but we can't because otherwise it messes with
the RS )
: LOOP
COMPILE R> 1 LITN COMPILE + COMPILE DUP COMPILE >R
COMPILE I' COMPILE = COMPILE SKIP? COMPILE (bbr)
H -^ C,
COMPILE R> COMPILE DROP COMPILE R> COMPILE DROP
; IMMEDIATE