100 lines
2.7 KiB
Plaintext
Executable file
100 lines
2.7 KiB
Plaintext
Executable file
0 const 0
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1 const 1
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2 const cell
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: cells cell * ;
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10 const '\n'
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13 const '\r'
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key const sp
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128 const F_IMMEDIATE
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0x100 const F_USERWORD
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: cr '\n' emit ;
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: bl sp emit ;
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: if ' BZ_ , here 0 , ; immediate
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: else ' GOTO_ , 0 , here swap ! here cell - ; immediate
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: then here swap ! ; immediate
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: begin here ; immediate
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: while ' BZ_ , here 0 , ; immediate
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: repeat ' GOTO_ , swap , here swap ! ; immediate
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: again ' GOTO_ , , ; immediate
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: until ' BZ_ , , ; immediate
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: lit ' LIT_ , , ;
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: ( begin key [ key ) lit ] = until ; immediate
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: inline| ' INLINEDATA_ , here 0 , ;
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: |inline [ ' then , ] ;
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' cells @ const $DOCOLON ( get the colon execution token )
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: :| inline| $DOCOLON , ; immediate
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: |; ' ret , |inline ; immediate
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: s" state if inline| else here then
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begin key dup [ key " lit ] != over 0 != and while b, repeat drop 0 b,
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state if |inline else dup here! then ; immediate
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: interpretword F_IMMEDIATE & state not or if execute else , then ;
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: interpretnumber state if lit then ;
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: interpretunknown type s" ?" type cr ;
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: compileword lookup dup
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if interpretword
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else drop number
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if interpretnumber
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else interpretunknown
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then
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then ;
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: interpreter
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begin word dup b@ while compileword repeat drop ;
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: load-input swap-input >r >r interpreter <r <r swap-input ;
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: loadstring ' key-string load-input drop drop ;
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( image loading )
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: noop ;
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: defer word new-word $DODEFERRED , ' noop , ;
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: redefine ( cp cpdeferred ) cell + ! ;
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: definition ( cpdeferred ) cell + @ ;
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defer onload
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: postload ' onload definition ' noop ' onload redefine execute ;
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: loadimage ( -- [0 | onload] )
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imagemagic fget = if
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fget fget fget fget fget ( onload tasks latest size start )
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here != if tell + seek drop drop drop 0 else
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dup here fread here + here! latest! tasks! then
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else 0 then ;
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: saveimage ( herestart -- )
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imagemagic fput
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' onload definition here drop fput
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tasks fput
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latest fput
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dup here swap - fput
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dup fput
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dup here swap - swap fwrite ;
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( file loading )
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: loadimage-if-uptodate ( filename -- b )
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dup image-uptodate if imagefilename open loadimage close else drop 0 then
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dup if execute 1 then ;
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: interpretjor ( filename -- )
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open fdeactivate ' key-file load-input drop factivate close ;
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: preservefp ( xt -- ) fdeactivate >r execute <r factivate ;
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: loadjor :| interpretjor postload |; preservefp ;
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: loadfile ( filename -- )
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( active file is preserved for the currently-loading file, but the
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new file is always loaded with no active files )
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:| dup loadimage-if-uptodate not if
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here over >r >r interpretjor
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<r <r imagefilename overwrite saveimage close postload
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else drop then |; preservefp ;
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