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|
: . 0 sys ;
: emit 1 sys ;
: 1+ 1 + ;
: 1- 1 - ;
: ! 2 _! ;
: @ 2 _@ ;
: , here ! 2 allot ;
: cell+ 2 + ;
: cells 2 * ;
: over 1 pick ;
: rot >r swap r> swap ;
: -rot rot rot ;
: nip swap drop ;
: tuck swap over ;
: 2drop drop drop ;
: 2dup over over ;
: 2over 3 pick 3 pick ;
: 2swap rot >r rot r> ;
: c! 1 _! ;
: c@ 1 _@ ;
: c, here c! 1 allot ;
: char+ 1+ ;
: chars ;
: base 0 ;
: _latest 1 cells ;
: imm _latest @ dup @ 1 5 << | swap ! ;
: state 2 cells ;
: postpone 1 3 cells ! ; imm
: _input 4 cells ;
: decimal 1 1+ base ! 1010 base ! ;
: hex 1 1+ base ! 10000 base ! ;
: ['] ' postpone literal ; imm
: [ 0 state ! ; imm
: ] 1 state ! ;
: 2r> ['] r> , ['] r> , ['] swap , ; imm
: 2>r ['] swap , ['] >r , ['] >r , ; imm
: 2r@ ['] r> , ['] r> , ['] 2dup , ['] >r , ['] >r , ['] swap , ; imm
: r@ ['] r> , ['] dup , ['] >r , ; imm
: 2! swap over ! cell+ ! ;
: 2@ dup cell+ @ swap @ ;
: +! swap over @ + swap ! ;
: 0= 0 = ;
: 0< 0 < ;
: <= - 1- 0< ;
: > <= 0= ;
: <> = 0= ;
: 0<> 0= 0= ;
: 0> 0 > ;
: if ['] _jmp0 , here 0 , ; imm
: then here swap ! ; imm
: else ['] _jmp , here 0 , here rot ! ; imm
: begin 0 here ; imm
: while swap 1+ swap postpone if -rot ; imm
: repeat ['] _jmp , , if postpone then then ; imm
: until ['] _jmp0 , , drop ; imm
: again postpone repeat ; imm
: do postpone 2>r here ; imm
: unloop postpone 2r> ['] 2drop , ; imm
: +loop postpone 2r> ['] rot , ['] + , ['] 2dup ,
postpone 2>r ['] - , ['] 0= , ['] _jmp0 , ,
postpone unloop ; imm
: loop 1 postpone literal postpone +loop ; imm
: i postpone r@ ; imm
: j postpone 2r> postpone r@ ['] -rot , postpone 2>r ; imm
: align here 1 & if 1 allot then ;
: aligned dup 1 & if 1+ then ;
: and & ;
: or | ;
: xor ^ ;
: lshift << ;
: rshift >> ;
: invert -1 ^ ;
: mod % ;
: 2* 2 * ;
: 2/ 2 / ;
: cr 10 emit ;
: bl 32 ;
: space bl emit ;
: spaces begin dup 0 > while space 1- repeat drop ;
: ?dup dup if dup then ;
: negate -1 * ;
: abs dup 0< if negate then ;
: min 2dup <= if drop else nip then ;
: max 2dup <= if nip else drop then ;
: word here -1 cells over ! dup cell+ rot begin key 2dup <> while
2 pick c! swap char+ swap repeat
2drop over - over +! ;
: count dup cell+ swap @ ;
: char bl word cell+ c@ ;
: [char] char postpone literal ; imm
: ( begin [char] ) key <> while repeat ; imm
: \ _input @ begin dup 0 > while key drop 1- repeat drop ; imm
: type begin dup 0 > while swap dup c@ emit char+ swap 1- repeat 2drop ;
: s" state @ if ['] _jmp , here 0 , then
[char] " word count
state @ 0= if exit then
dup cell+ allot
rot here swap !
swap postpone literal postpone literal ; imm
: c" state @ if ['] _jmp , here 0 , then
[char] " word
state @ 0= if exit then
dup count nip allot
here rot !
postpone literal ; imm
: ." postpone s" state @ if ['] type , else type then ; imm
: .( [char] ) word count type ; imm
: create align here bl word count nip cell+ allot align
['] _lit , here 3 cells + , ['] exit dup , ,
dup @ 31 & over _latest @ - 6 << or over ! _latest ! ;
: _latword _latest @
dup @ 31 & + cell+ aligned ;
: _does> _latword 2 cells +
['] _jmp over ! cell+
r@ 1 cells - @ swap ! ;
: does> ['] _jmp , here 2 cells + dup , 2 cells + ,
['] _does> , ['] exit , ; imm
: >body cell+ @ ;
: compile, postpone literal postpone execute ;
: buffer: create allot ;
: variable create 1 cells allot ;
: constant create , does> @ ;
: value constant ;
: to ' 4 cells + state @ if postpone literal ['] ! , else ! then ; imm
: defer create does> @ execute ;
: defer@ >body @ ;
: defer! >body ! ;
: is state @ if postpone ['] postpone defer! else ' defer! then ; imm
: action-of state @ if postpone ['] postpone defer@ else ' defer@ then ; imm
-1 constant true
0 constant false
: >in _input 80 chars + cell+ _input @ - 4 chars - ;
: source _input @ 6 chars + >in 3 chars - swap ;
: quit begin _rdepth 1 > while r> drop repeat postpone [ ;
: abort begin depth 0 > while drop repeat quit ;
: recurse _latword , ; imm
: move begin dup 0 > while
rot dup @ >r 1+
rot r> over ! 1+
rot 1- repeat drop 2drop ;
: fill -rot begin dup 0 > while
>r 2dup c! char+ r> 1- repeat
2drop drop ;
: erase begin dup 0 > while swap 0 over ! 1+ swap 1- repeat ;
: roll dup if swap >r 1- recurse r> swap exit then drop ;
: environment? 2drop false ;
: accept over >r begin dup 0 > while
key dup 32 < if 2drop 0
else dup emit rot 2dup c! char+ nip swap 1- then
repeat drop r> - 1 chars / ;
: marker create _latest @ , here , does>
dup @ _latest ! cell+ @ here swap - allot ;
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