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235 lines
6.8 KiB
Forth
235 lines
6.8 KiB
Forth
: * m* drop ;
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: s>d 1 m* ;
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: / >r s>d r> _/ ;
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: % >r s>d r> _% ;
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: um* 0 swap 0 _uma ;
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: cell+ 2 + ;
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: cells 2 * ;
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: char+ 1 + ;
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: chars ;
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: . 0 sys ;
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: emit 2 sys ;
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: 1+ 1 + ;
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: 1- 1 - ;
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: over 1 pick ;
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: rot >r swap r> swap ;
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: -rot rot rot ;
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: ' _' drop ;
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: ! 1 _! ;
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: @ 1 _@ ;
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: +! dup >r swap r> @ + swap ! ;
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: _latest 2 cells ;
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: imm _latest @ dup @ 1 5 << | swap ! ;
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: immediate imm ;
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: [ 0 3 cells ! ; imm
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: ] 1 3 cells ! ;
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: , 1 cells dup >r @ ! r> dup +! ;
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: literal [ ' _lit dup , , ] , , ; imm
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: ['] ' [ ' literal , ] ; imm
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: base 0 ;
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: here [ 1 cells ] literal @ ;
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: allot [ 1 cells ] literal +! ;
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: state [ 3 cells ] literal ;
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: _compxt [ 4 cells ] literal ;
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: _source [ 5 cells ] literal ;
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: _sourceu [ 6 cells ] literal ;
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: >in [ 7 cells ] literal ;
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: _begin [ 8 cells 80 chars + ] literal ;
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: c! 0 _! ;
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: c@ 0 _@ ;
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: c, here c! 1 allot ;
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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 , swap here swap ! ; imm
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: postpone _' dup 0 = if exit then
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1 = swap ['] _lit , , if ['] execute ,
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else ['] , , then ; imm
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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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: decimal 10 base ! ;
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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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: 0= 0 = ;
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: 0< 0 < ;
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: <= 2dup < >r = r> | ;
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: > swap < ;
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: <> = 0= ;
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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 ['] _lit , here 0 , ['] >r , postpone 2>r here ; imm
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: unloop postpone 2r> ['] 2drop , ['] r> , ['] drop , ; imm
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: leave postpone 2r> ['] 2drop , ['] exit , ; imm
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: +loop ['] r> , ['] 2dup , ['] + ,
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postpone r@ ['] swap , ['] >r ,
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['] - , ['] 2dup , ['] + , ['] over , ['] ^ ,
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['] rot , ['] rot , ['] ^ , ['] & , ['] _lit , 0 ,
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['] < , ['] _jmp0 , ,
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postpone unloop here 1 cells - swap ! ; imm
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: loop postpone 2r> ['] 1+ , ['] 2dup ,
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postpone 2>r ['] = , ['] _jmp0 , ,
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postpone unloop here 1 cells - swap ! ; imm
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: i postpone r@ ; imm
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: j postpone 2r> ['] r> , postpone r@ ['] swap ,
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['] >r , ['] -rot , postpone 2>r ; imm
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: aligned dup [ 1 cells 1- ] literal swap over & if [ 1 cells ] literal
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swap - + else drop then ;
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: align here dup aligned swap - allot ;
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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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: invert -1 ^ ;
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: mod % ;
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: 2* 2 * ;
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: _msb [ 1 1 cells 8 * 1- << ] literal ;
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: 2/ dup 1 >> swap 0< if _msb or then ;
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: /mod 2dup % -rot / ;
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: */ >r m* r> _/ ;
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: sm/rem >r 2dup r@ _% -rot r> _/ ;
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: */mod >r m* r> sm/rem ;
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: fm/mod 2dup dup >r ^ >r sm/rem swap dup
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if r> 0< if r> + swap 1- else swap r> drop then
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else swap 2r> 2drop then ;
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: cr 10 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 drop ;
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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 swap drop then ;
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: max 2dup <= if swap drop else drop then ;
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: source _source @ _sourceu @ ;
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: key _source @ >in @ +
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begin dup c@ 0 = while _in repeat
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c@ 1 >in +! ;
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: key? _source @ >in @ + c@ 0 <> ;
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: word begin key? if key else -1 then 2dup <> until
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key? 0= if 2drop 0 here c! here exit then
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here begin char+ swap over c! swap
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key? if key else dup then
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2dup <> while rot repeat
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2drop here - here c! here ;
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: count dup char+ swap c@ ;
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: char bl word char+ c@ ;
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: [char] char postpone literal ; imm
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: ( begin [char] ) key <> while repeat ; imm
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: _type >r begin dup 0 > while
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swap dup c@ r@ execute char+ swap 1- repeat 2drop r> drop ;
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: type [ ' emit ] literal _type ;
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: s" state @ if ['] _jmp , here 0 , then
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[char] " word count
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state @ 0= if exit then
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dup cell+ allot
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rot here swap !
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swap postpone literal postpone literal ; imm
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: ." postpone s" state @ if ['] type , else type then ; imm
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: :noname here dup _compxt ! 0 , here swap ] ;
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: create : here [ 4 cells ] literal + postpone literal postpone ; 0 , ;
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: >body cell+ @ ;
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: _does> >r _latest @ dup @ 31 & + cell+ aligned [ 2 cells ] literal +
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['] _jmp over ! cell+ r> cell+ swap ! ;
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: does> state @ if
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['] _lit , here 2 cells + , ['] _does> , ['] exit , else
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here dup _does> dup _compxt ! 0 , ] then ; imm
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: variable create [ 1 cells ] literal allot ;
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: constant create , does> @ ;
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: quit begin _rdepth 1 > while r> drop repeat postpone [ ;
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: abort begin depth 0 > while drop repeat quit ;
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: abort" postpone s" ['] rot ,
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postpone if ['] type , ['] abort ,
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postpone else ['] 2drop , postpone then ; imm
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: recurse _compxt @ dup @ 31 & + cell+ aligned , ; imm
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: move dup 0 <= if drop 2drop exit then
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>r 2dup < r> swap if
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1- 0 swap do over i + c@ over i + c! -1 +loop
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else
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0 do over i + c@ over i + c! loop
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then 2drop ;
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: fill -rot begin dup 0 > while
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>r 2dup c! char+ r> 1- repeat
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2drop drop ;
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: environment? 2drop 1 0= ;
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: accept over >r begin dup 0 > while
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key dup 32 < if 2drop 0
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else dup emit rot 2dup c! char+ swap drop swap 1- then
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repeat drop r> - [ 1 chars ] literal / ;
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: evaluate _source @ >r _sourceu @ >r >in @ >r
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0 >in ! _sourceu ! _source ! _ev
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r> >in ! r> _sourceu ! r> _source ! ;
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: _isdigit ( ch -- bch )
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dup [char] 0 over <= swap [char] 0 base @ 10 min 1- + <= and
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if drop [char] 0 exit then
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base @ 11 < if drop 0 exit then
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base @ 36 min 10 - >r
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dup [char] a over <= swap [char] a r@ + < and
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if r> 2drop [char] a 10 - exit then
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[char] A over <= swap [char] A r> + < and
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if [char] A 10 - else 0 then ;
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: >number begin dup 0 >
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dup if drop over c@ _isdigit then while
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>r dup c@ swap >r base @ swap
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dup _isdigit - _uma
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r> char+ r> 1- repeat ;
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: <# 40 here c! ;
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: #> 2drop here dup c@ + 40 here c@ - ;
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: hold -1 here +! here dup c@ + c! ;
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: # base @
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>r 0 i um/mod r> swap >r um/mod r>
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rot 9 over <
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if 7 + then 48 + hold ;
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: #s begin # 2dup or 0= until ;
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: sign 0< if [char] - hold then ;
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: u. 0 <# bl hold #s #> type ;
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