diff options
Diffstat (limited to 'qemu/roms/openbios/forth/bootstrap/interpreter.fs')
| -rw-r--r-- | qemu/roms/openbios/forth/bootstrap/interpreter.fs | 175 |
1 files changed, 0 insertions, 175 deletions
diff --git a/qemu/roms/openbios/forth/bootstrap/interpreter.fs b/qemu/roms/openbios/forth/bootstrap/interpreter.fs deleted file mode 100644 index 51870581f..000000000 --- a/qemu/roms/openbios/forth/bootstrap/interpreter.fs +++ /dev/null @@ -1,175 +0,0 @@ -\ tag: forth interpreter -\ -\ Copyright (C) 2003 Stefan Reinauer -\ -\ See the file "COPYING" for further information about -\ the copyright and warranty status of this work. -\ - - -\ -\ 7.3.4.6 Display pause -\ - -0 value interactive? -0 value terminate? - -: exit? - interactive? 0= if - false exit - then - false \ FIXME we should check whether to interrupt output - \ and ask the user how to proceed. - ; - - -\ -\ 7.3.9.1 Defining words -\ - -: forget - s" This word is obsolescent." type cr - ['] ' execute - cell - dup - @ dup - last ! latest ! - here! - ; - -\ -\ 7.3.9.2.4 Miscellaneous dictionary -\ - -\ interpreter. This word checks whether the interpreted word -\ is a word in dictionary or a number. It honours compile mode -\ and immediate/compile-only words. - -: interpret - 0 >in ! - begin - parse-word dup 0> \ was there a word at all? - while - $find - if - dup flags? 0<> state @ 0= or if - execute - else - , \ compile mode && !immediate - then - else \ word is not known. maybe it's a number - 2dup $number - if - span @ >in ! \ if we encountered an error, don't continue parsing - type 3a emit - -13 throw - else - -rot 2drop 1 handle-lit - then - then - depth 200 >= if -3 throw then - depth 0< if -4 throw then - rdepth 200 >= if -5 throw then - rdepth 0< if -6 throw then - repeat - 2drop - ; - -: refill ( -- ) - ib #ib @ expect 0 >in ! ; - -: print-status ( exception -- ) - space - ?dup if - dup sys-debug \ system debug hook - case - -1 of s" Aborted." type endof - -2 of s" Aborted." type endof - -3 of s" Stack Overflow." type 0 depth! endof - -4 of s" Stack Underflow." type 0 depth! endof - -5 of s" Return Stack Overflow." type endof - -6 of s" Return Stack Underflow." type endof - -13 of s" undefined word." type endof - -15 of s" out of memory." type endof - -21 of s" undefined method." type endof - -22 of s" no such device." type endof - dup s" Exception #" type . - 0 state ! - endcase - else - state @ 0= if - s" ok" - else - s" compiled" - then - type - then - cr - ; - -defer status -['] noop ['] status (to) - -: print-prompt - status - depth . 3e emit space - ; - -defer outer-interpreter -:noname - cr - begin - print-prompt - source 0 fill \ clean input buffer - refill - - ['] interpret catch print-status - terminate? - until -; ['] outer-interpreter (to) - -\ -\ 7.3.8.5 Other control flow commands -\ - -: save-source ( -- ) - r> \ fetch our caller - ib >r #ib @ >r \ save current input buffer - source-id >r \ and all variables - span @ >r \ associated with it. - >in @ >r - >r \ move back our caller - ; - -: restore-source ( -- ) - r> - r> >in ! - r> span ! - r> ['] source-id (to) - r> #ib ! - r> ['] ib (to) - >r - ; - -: (evaluate) ( str len -- ??? ) - save-source - -1 ['] source-id (to) - dup - #ib ! span ! - ['] ib (to) - interpret - restore-source - ; - -: evaluate ( str len -- ?? ) - 2dup + -rot - over + over do - i c@ 0a = if - i over - - (evaluate) - i 1+ - then - loop - swap over - (evaluate) - ; - -: eval evaluate ; |