mirror of
https://github.com/hsoft/collapseos.git
synced 2024-11-08 18:08:05 +11:00
27 lines
883 B
Forth
27 lines
883 B
Forth
: H HERE @ ;
|
|
: -^ SWAP - ;
|
|
: +! SWAP OVER @ + SWAP ! ;
|
|
: ALLOT HERE +! ;
|
|
: , H ! 2 ALLOT ;
|
|
: C, H C! 1 ALLOT ;
|
|
: IF ['] (fbr?) , H 1 ALLOT ; IMMEDIATE
|
|
: THEN DUP H -^ SWAP C! ; IMMEDIATE
|
|
: ELSE ['] (fbr) , 1 ALLOT DUP H -^ SWAP C! H 1 - ; IMMEDIATE
|
|
: RECURSE R> R> 2 - >R >R EXIT ;
|
|
: ( LIT@ ) WORD SCMP IF RECURSE THEN ; IMMEDIATE
|
|
( Hello, hello, krkrkrkr... do you hear me? )
|
|
( Ah, voice at last! Some lines above need comments )
|
|
( IF: write (fbr?) addr, push HERE, create cell )
|
|
( THEN: Subtract TOS from H to get offset to write to cell )
|
|
( in that same TOS's addr )
|
|
( ELSE: write (fbr) addr, allot, then same as THEN )
|
|
( RECURSE: RS TOS is for RECURSE itself, then we have to dig )
|
|
( one more level to get to RECURSE's parent's caller. )
|
|
: NOT IF 0 ELSE 1 THEN ;
|
|
: ? @ . ;
|
|
: VARIABLE CREATE 2 ALLOT ;
|
|
: CONSTANT CREATE H ! DOES> @ ;
|
|
: = CMP NOT ;
|
|
: < CMP 0 1 - = ;
|
|
: > CMP 1 = ;
|