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126 lines
3.1 KiB
Forth
126 lines
3.1 KiB
Forth
( : variable create 0 , ; )
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( : create here const ; )
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: . 0 sys ;
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: emit 1 sys ;
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: 1+ 1 + ;
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: 1- 1 - ;
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: ! 2 _! ;
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: @ 2 _@ ;
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: , here ! 2 allot ;
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: cell+ 2 + ;
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: cells 2 * ;
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: over 1 pick ;
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: -rot rot rot ;
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: nip swap drop ;
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: tuck swap over ;
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: 2drop drop drop ;
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: 2dup over over ;
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: 2over 3 pick 3 pick ;
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: 2swap rot >r rot r> ;
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: c! 1 _! ;
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: c@ 1 _@ ;
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: c, here c! 1 allot ;
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: char+ 1+ ;
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: chars ;
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: base 0 ;
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: _latest 1 cells ;
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: imm _latest @ dup @ 1 5 << | swap ! ;
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: state 2 cells ;
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: postpone 1 3 cells ! ; imm
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: _input 4 cells ;
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: decimal 1 1+ base ! 1010 base ! ;
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: ['] ' postpone literal ; imm
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: [ 0 state ! ; imm
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: ] 1 state ! ;
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: 2r> ['] r> , ['] r> , ['] swap , ; imm
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: 2>r ['] swap , ['] >r , ['] >r , ; imm
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: r@ ['] r> , ['] dup , ['] >r , ; imm
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: 2! swap over ! cell+ ! ;
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: 2@ dup cell+ @ swap @ ;
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: +! swap over @ + swap ! ;
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: 0= 0 = ;
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: 0< 0 < ;
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: <= - 1- 0< ;
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: > <= 0= ;
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: <> = 0= ;
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: if ['] _jmp0 , here 0 , ; imm
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: then here swap ! ; imm
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: else ['] _jmp , here 0 , here rot ! ; imm
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: begin 0 here ; imm
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: while swap 1+ swap postpone if -rot ; imm
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: repeat ['] _jmp , , if postpone then then ; imm
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: until ['] _jmp0 , , drop ; imm
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: do postpone 2>r here ; imm
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: unloop postpone 2r> ['] 2drop , ; imm
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: +loop postpone 2r> ['] rot , ['] + , ['] 2dup ,
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postpone 2>r ['] - , ['] 0= , ['] _jmp0 , ,
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postpone unloop ; imm
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: loop 1 postpone literal postpone +loop ; imm
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: i postpone r@ ; imm
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: align here 1 & if 1 allot then ;
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: aligned dup 1 & if 1+ then ;
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: and & ;
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: or | ;
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: xor ^ ;
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: lshift << ;
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: rshift >> ;
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: mod % ;
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: 2* 2 * ;
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: 2/ 2 / ;
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: cr 9 emit ;
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: bl 32 ;
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: space bl emit ;
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: spaces begin dup 0 > while space 1- repeat ;
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: ?dup dup if dup then ;
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: negate -1 * ;
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: abs dup 0< if negate then ;
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: min 2dup <= if drop else nip then ;
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: max 2dup <= if nip else drop then ;
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: word here -1 cells over ! dup cell+ rot begin key 2dup <> while
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2 pick c! swap char+ swap repeat
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2drop over - over +! ;
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: count dup cell+ swap @ ;
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: char bl word cell+ c@ ;
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: [char] char postpone literal ; imm
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: type begin dup 0 > while swap dup c@ emit char+ swap 1- repeat ;
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: ." [char] " word count type ;
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: create align here bl word count nip cell+ allot align
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['] _lit , here 3 cells + , ['] exit , 0 ,
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dup @ 31 & over _latest @ - 6 << or over ! _latest ! ;
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: does> _latest @
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dup @ 31 & + cell+ aligned
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2 cells +
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['] _jmp over ! cell+
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here swap ! ] ;
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: >body cell+ @ ;
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: variable create 1 cells allot ;
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: constant create , does> ['] @ , postpone ; ;
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( TODO fix compile-time does>... above should simply be "does> @ ;" )
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: >in _input 80 chars + cell+ _input @ - 4 chars - ;
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: source _input @ 6 chars + >in 3 chars - swap ;
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