pete286/boot.jor

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2 const cell
: cells cell * ;
key ) const ')'
10 const '\n'
13 const '\r'
key const sp
128 const F_IMMEDIATE
: cr '\n' emit ;
: bl sp emit ;
: if ' BZ_ , here 0 , ; immediate
: else ' GOTO_ , 0 , here swap ! here cell - ; immediate
: then here swap ! ; immediate
: begin here ; immediate
: while ' BZ_ , here 0 , ; immediate
: repeat ' GOTO_ , swap , here swap ! ; immediate
: again ' GOTO_ , , ; immediate
: until ' BZ_ , , ; immediate
: ( begin key ')' = until ; immediate
: lit ' LIT_ , , ;
: inline| ' INLINEDATA_ , here 0 , ;
: |inline [ ' then , ] ;
' cells @ const $DOCOLON ( get the colon execution token )
: :| inline| $DOCOLON , ; immediate
: |; ' ret , |inline ; immediate
key " const '"'
: s" state if inline| else here then
begin key dup '"' != over 0 != and while b, repeat drop 0 b,
state if |inline else dup here! then ; immediate
: interpretword F_IMMEDIATE & state not or if execute else , then ;
: interpretnumber state if lit then ;
: interpretunknown type s" ?" type cr ;
: compileword lookup dup
if interpretword
else drop number
if interpretnumber
else interpretunknown
then
then ;
: interpreter
2019-02-11 00:17:58 +00:00
begin word dup b@ while compileword repeat drop ;
: load-input swap-input >r >r interpreter <r <r swap-input ;
: loadstring ' key-string load-input drop drop ;
( image loading )
: noop ;
: defer word new-word $DODEFERRED , ' noop , ;
: redefine ( cp cpdeferred ) cell + ! ;
: definition ( cpdeferred ) cell + @ ;
defer onload
: postload ' onload definition ' noop ' onload redefine execute ;
: loadimage ( -- [0 | onload] )
imagemagic fget = if
fget fget fget fget fget ( onload tasks latest size start )
here != if tell + seek drop drop drop 0 else
dup here fread here + here! latest! tasks! then
else 0 then ;
: saveimage ( herestart -- )
imagemagic fput
' onload definition here drop fput
tasks fput
latest fput
dup here swap - fput
dup fput
dup here swap - swap fwrite ;
( file loading )
: loadimage-if-uptodate ( filename -- b )
dup image-uptodate if imagefilename open loadimage close else drop 0 then
dup if execute 1 then ;
: interpretjor ( filename -- )
open fdeactivate ' key-file load-input drop factivate close ;
: preservefp ( xt -- ) fdeactivate >r execute <r factivate ;
: loadjor :| interpretjor postload |; preservefp ;
: loadfile ( filename -- )
( active file is preserved for the currently-loading file, but the
new file is always loaded with no active files )
:| dup loadimage-if-uptodate not if
here over >r >r interpretjor
<r <r imagefilename overwrite saveimage close postload
else drop then |; preservefp ;