36 lines
1.2 KiB
Forth
36 lines
1.2 KiB
Forth
: H HERE @ ;
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: -^ SWAP - ;
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: +! SWAP OVER @ + SWAP ! ;
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: ALLOT HERE +! ;
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: , H ! 2 ALLOT ;
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: C, H C! 1 ALLOT ;
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: BEGIN H ; IMMEDIATE
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: COMPILE ' ['] LITN EXECUTE ['] , , ; IMMEDIATE
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: AGAIN COMPILE (bbr) H -^ C, ; IMMEDIATE
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: NOT 1 SWAP SKIP? EXIT 0 * ;
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: ( BEGIN LITS ) WORD SCMP NOT SKIP? AGAIN ; IMMEDIATE
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( Hello, hello, krkrkrkr... do you hear me?
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Ah, voice at last! Some lines above need comments
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BTW: Forth lines limited to 64 cols because of default
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input buffer size in Collapse OS
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COMPILE; Tough one. Get addr of caller word (example above
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(bbr)) and then call LITN on it. However, LITN is an
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immediate and has to be indirectly executed. Then, write
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a reference to "," so that this word is written to HERE.
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NOT: a bit convulted because we don't have IF yet )
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: IF COMPILE SKIP? COMPILE (fbr) H 1 ALLOT ; IMMEDIATE
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( Subtract TOS from H to get offset to write to IF or ELSE's
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br cell )
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: THEN DUP H -^ SWAP C! ; IMMEDIATE
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( write (fbr) addr, allot, then same as THEN )
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: ELSE
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COMPILE (fbr) 1 ALLOT DUP H -^ SWAP C! H 1 - ; IMMEDIATE
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: ? @ . ;
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: VARIABLE CREATE 2 ALLOT ;
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: CONSTANT CREATE H ! DOES> @ ;
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: = CMP NOT ;
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: < CMP 0 1 - = ;
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: > CMP 1 = ;
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