: * m* drop ; : s>d 1 m* ; : / >r s>d r> _/ ; : % >r s>d r> _% ; : um* 0 swap 0 _uma ; : cell+ 2 + ; : cells 2 * ; : char+ 1 + ; : chars ; : . 0 sys ; : emit 2 sys ; : 1+ 1 + ; : 1- 1 - ; : over 1 pick ; : rot >r swap r> swap ; : -rot rot rot ; : ' _' drop ; : ! 1 _! ; : @ 1 _@ ; : +! dup >r swap r> @ + swap ! ; : _latest 2 cells ; : imm _latest @ dup @ 1 5 << | swap ! ; : immediate imm ; : [ 0 3 cells ! ; imm : ] 1 3 cells ! ; : , 1 cells dup >r @ ! r> dup +! ; : literal [ ' _lit dup , , ] , , ; imm : ['] ' [ ' literal , ] ; imm : base 0 ; : here [ 1 cells ] literal @ ; : allot [ 1 cells ] literal +! ; : state [ 3 cells ] literal ; : _compxt [ 4 cells ] literal ; : _source [ 5 cells ] literal ; : _sourceu [ 6 cells ] literal ; : >in [ 7 cells ] literal ; : _begin [ 8 cells 80 chars + ] literal ; : c! 0 _! ; : c@ 0 _@ ; : c, here c! 1 allot ; : if ['] _jmp0 , here 0 , ; imm : then here swap ! ; imm : else ['] _jmp , here 0 , swap here swap ! ; imm : postpone _' dup 0 = if exit then 1 = swap ['] _lit , , if ['] execute , else ['] , , then ; imm : 2drop drop drop ; : 2dup over over ; : 2over 3 pick 3 pick ; : 2swap rot >r rot r> ; : decimal 10 base ! ; : 2r> ['] r> , ['] r> , ['] swap , ; imm : 2>r ['] swap , ['] >r , ['] >r , ; imm : r@ ['] r> , ['] dup , ['] >r , ; imm : 2! swap over ! cell+ ! ; : 2@ dup cell+ @ swap @ ; : 0= 0 = ; : 0< 0 < ; : <= 2dup < >r = r> | ; : > swap < ; : <> = 0= ; : begin 0 here ; imm : while swap 1+ swap postpone if -rot ; imm : repeat ['] _jmp , , if postpone then then ; imm : until ['] _jmp0 , , drop ; imm : do ['] _lit , here 0 , ['] >r , postpone 2>r here ; imm : unloop postpone 2r> ['] 2drop , ['] r> , ['] drop , ; imm : leave postpone 2r> ['] 2drop , ['] exit , ; imm : +loop ['] r> , ['] 2dup , ['] + , postpone r@ ['] swap , ['] >r , ['] - , ['] 2dup , ['] + , ['] over , ['] ^ , ['] rot , ['] rot , ['] ^ , ['] & , ['] _lit , 0 , ['] < , ['] _jmp0 , , postpone unloop here 1 cells - swap ! ; imm : loop postpone 2r> ['] 1+ , ['] 2dup , postpone 2>r ['] = , ['] _jmp0 , , postpone unloop here 1 cells - swap ! ; imm : i postpone r@ ; imm : j postpone 2r> ['] r> , postpone r@ ['] swap , ['] >r , ['] -rot , postpone 2>r ; imm : and & ; : or | ; : xor ^ ; : lshift << ; : rshift >> ; : invert -1 ^ ; : mod % ; : 2* 2 * ; : _msb [ 1 1 cells 8 * 1- << ] literal ; : 2/ dup 1 >> swap 0< if _msb or then ; : aligned [ 1 cells 1- ] literal swap over + swap invert and ; : align here dup aligned swap - allot ; : /mod 2dup % -rot / ; : */ >r m* r> _/ ; : sm/rem >r 2dup r@ _% -rot r> _/ ; : */mod >r m* r> sm/rem ; : fm/mod 2dup dup >r ^ >r sm/rem swap dup if r> 0< if r> + swap 1- else swap r> drop then else swap 2r> 2drop then ; : 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 swap drop then ; : max 2dup <= if swap drop else drop then ; : source _source @ _sourceu @ ; : key _source @ >in @ + begin dup c@ 0 = while _in repeat c@ 1 >in +! ; : key? _source @ >in @ + c@ 0 <> ; : word begin key? if key else -1 then 2dup <> until key? 0= if 2drop 0 here c! here exit then here begin char+ swap over c! swap key? if key else dup then 2dup <> while rot repeat 2drop here - here c! here ; : count dup char+ swap c@ ; : char 0 here char+ c! bl word char+ c@ ; : [char] char postpone literal ; imm : ( begin [char] ) key <> while repeat ; imm : _type >r begin dup 0 > while swap dup c@ r@ execute char+ swap 1- repeat 2drop r> drop ; : type [ ' emit ] literal _type ; : 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 : ." postpone s" state @ if ['] type , else type then ; imm : :noname here dup _compxt ! 0 , here swap ] ; : create : here [ 4 cells ] literal + postpone literal postpone ; 0 , ; : >body cell+ @ ; : _does> >r _latest @ dup @ 31 & + cell+ aligned [ 2 cells ] literal + ['] _jmp over ! cell+ r> cell+ swap ! ; : does> state @ if ['] _lit , here 2 cells + , ['] _does> , ['] exit , else here dup _does> dup _compxt ! 0 , ] then ; imm : variable create [ 1 cells ] literal allot ; : constant create , does> @ ; : quit begin _rdepth 1 > while r> drop repeat postpone [ ; : abort begin depth 0 > while drop repeat quit ; : abort" postpone s" ['] rot , postpone if ['] type , ['] abort , postpone else ['] 2drop , postpone then ; imm : recurse _compxt @ dup @ 31 & + cell+ aligned , ; imm : move dup 0 <= if drop 2drop exit then >r 2dup < r> swap if 1- 0 swap do over i + c@ over i + c! -1 +loop else 0 do over i + c@ over i + c! loop then 2drop ; : fill -rot begin dup 0 > while >r 2dup c! char+ r> 1- repeat 2drop drop ; : environment? 2drop 1 0= ; : accept over >r begin dup 0 > while key dup 32 < if 2drop 0 else dup emit rot 2dup c! char+ swap drop swap 1- then repeat drop r> - [ 1 chars ] literal / ; : evaluate _source @ >r _sourceu @ >r >in @ >r 0 >in ! _sourceu ! _source ! _ev r> >in ! r> _sourceu ! r> _source ! ; : _isdigit ( ch -- bch ) dup [char] 0 over <= swap [char] 0 base @ 10 min 1- + <= and if drop [char] 0 exit then base @ 11 < if drop 0 exit then base @ 36 min 10 - >r dup [char] a over <= swap [char] a r@ + < and if r> 2drop [char] a 10 - exit then [char] A over <= swap [char] A r> + < and if [char] A 10 - else 0 then ; : >number begin dup 0 > dup if drop over c@ _isdigit then while >r dup c@ swap >r base @ swap dup _isdigit - _uma r> char+ r> 1- repeat ; : <# [ 20 cells ] literal here c! ; : #> 2drop here dup c@ + [ 20 cells ] literal here c@ - ; : hold -1 here +! here dup c@ + c! ; : # base @ >r 0 i um/mod r> swap >r um/mod r> rot 9 over < if 7 + then 48 + hold ; : #s begin # 2dup or 0= until ; : sign 0< if [char] - hold then ; : u. 0 <# bl hold #s #> type ;