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50 lines
1.6 KiB
Forth
50 lines
1.6 KiB
Forth
-1 constant true
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0 constant false
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: hex 16 base ! ;
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: nip swap drop ;
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: tuck swap over ;
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: 0> 0 > ;
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: 0<> 0= 0= ;
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: 2r@ ['] r> , ['] r> , ['] 2dup , ['] >r , ['] >r , ['] swap , ; imm
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: compile, postpone literal postpone execute ;
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: \ _source @ >in @ +
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begin dup c@ while 0 over c! char+ repeat drop ; imm
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: again postpone repeat ; imm
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: ?do ['] 2dup , ['] _lit , here 0 , ['] >r , ['] = , postpone if
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['] 2drop , postpone 2r> ['] drop , ['] >r , ['] exit ,
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postpone then postpone 2>r here ; imm
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: .( [char] ) word count type ; imm
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: c" state @ if ['] _jmp , here 0 , then
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[char] " word
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state @ 0= if exit then
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dup count nip allot
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here rot !
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postpone literal ; imm
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: buffer: create allot ;
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: value constant ;
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: to ' 4 cells + state @ if postpone literal ['] ! , else ! then ; imm
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: defer create does> @ execute ;
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: defer@ >body @ ;
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: defer! >body ! ;
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: is state @ if postpone ['] postpone defer! else ' defer! then ; imm
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: action-of state @ if postpone ['] postpone defer@ else ' defer@ then ; imm
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: erase begin dup 0 > while swap 0 over ! 1+ swap 1- repeat ;
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: roll dup if swap >r 1- recurse r> swap exit then drop ;
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: marker create _latest @ , here , does>
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dup @ _latest ! cell+ @ here swap - allot ;
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: case ['] _lit , 1 here 0 , ['] drop , ; imm
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: of ['] over , ['] = , postpone if ; imm
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: endof ['] _jmp , here >r 0 , postpone then
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swap 1+ swap r> tuck ! ; imm
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: endcase swap 0 do dup @ swap here swap ! loop drop ['] drop , ; imm
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