include term-colours.4th
include defer-is.4th
include catch-throw.4th
+include integer.4th
include float.4th
include debugging.4th
make-type fixnum-type
make-type flonum-type
+make-type ratnum-type
make-type boolean-type
make-type character-type
make-type string-type
make-type symbol-type
make-type primitive-proc-type
make-type compound-proc-type
-make-type fileport-type
+make-type port-type
: istype? ( obj type -- obj bool )
over = ;
\ }}}
-\ ---- Port I/O ---- {{{
-
-: fileport>fid ( fileport -- fid )
- drop ;
-
-: fid>fileport ( fid -- fileport )
- fileport-type ;
-
-: open-input-file ( addr n -- fileport )
- r/o open-file drop fid>fileport
-;
-
-: close-port ( fileport -- )
- fileport>fid close-file drop
-;
-
-objvar console-i/o-port
-0 fileport-type console-i/o-port obj!
-
-objvar current-input-port
-console-i/o-port obj@ current-input-port obj!
-
-: read-port ( fileport -- obj )
- current-input-port obj!
- read ;
-
-: read-console ( -- obj )
- console-i/o-port obj@ read-port ;
-
-\ }}}
-
\ ---- Pre-defined symbols ---- {{{
objvar symbol-table
create-symbol lambda lambda-symbol
create-symbol λ λ-symbol
create-symbol begin begin-symbol
+create-symbol eof eof-symbol
+
+\ Symbol to be bound to welcome message procedure by library
+create-symbol welcome welcome-symbol
+
+\ }}}
+
+\ ---- Port I/O ---- {{{
+
+( Ports are pairs with the fid in the car and the peek buffer in the cdr. )
+
+: fileport>fid ( fileport -- fid )
+ drop pair-type car drop ;
+
+: get-last-peek ( fileport -- char/nil )
+ drop pair-type cdr ;
+
+: set-last-peek ( char/nil fileport -- )
+ drop pair-type set-cdr!
+;
+
+: fid>fileport ( fid -- fileport )
+ fixnum-type nil cons drop port-type ;
+
+: open-input-file ( addr n -- fileport )
+ r/o open-file drop fid>fileport
+;
+
+: close-port ( fileport -- )
+ fileport>fid close-file drop
+;
+
+objvar console-i/o-port
+0 fixnum-type nil cons drop port-type console-i/o-port obj!
+
+objvar current-input-port
+console-i/o-port obj@ current-input-port obj!
+
+: read-char ( port -- char )
+ 2dup get-last-peek nil? if
+ 2drop
+ 2dup console-i/o-port obj@ objeq? if
+ 2drop
+ key character-type
+ else
+ fileport>fid pad 1 rot read-file 0= if
+ eof-symbol
+ else
+ pad @ character-type
+ then
+ then
+ else
+ nil 2rot set-cdr!
+ then
+;
+
+: peek-char ( port -- char )
+ 2dup get-last-peek nil? if
+ 2drop 2dup read-char
+ 2dup 2rot set-last-peek
+ else
+ 2swap 2drop
+ then
+;
+
+variable read-line-buffer-span
+variable read-line-buffer-offset
+
+( Hack to save original read-line while we transition to new one. )
+: orig-read-line immediate
+ ['] read-line , ;
+
+: read-line ( port -- string )
+
+ 2dup get-last-peek
+ nil? if
+ 2drop
+ 0 read-line-buffer-offset !
+ else
+ 2over nil 2swap set-last-peek
+ 2dup drop '\n' = if
+ 2drop nil nil cons exit
+ else
+ drop pad !
+ 1 read-line-buffer-offset !
+ then
+ then
+
+ 2dup console-i/o-port obj@ objeq? if
+ 2drop
+ pad read-line-buffer-offset @ + 200 expect cr
+ span @ read-line-buffer-offset @ + read-line-buffer-span !
+ else
+ pad read-line-buffer-offset @ + 200 2over fileport>fid orig-read-line
+ drop swap read-line-buffer-offset @ + read-line-buffer-span !
+ then
+
+ nil
+
+ begin
+ read-line-buffer-span @ 0>
+ while
+ pad read-line-buffer-span @ 1- + @ character-type 2swap cons
+ -1 read-line-buffer-span +!
+ repeat
+
+ nil? if
+ nil cons drop string-type
+ else
+ drop string-type
+ then
+;
+
+: read-port ( fileport -- obj )
+ current-input-port obj!
+ read ;
+
+: read-console ( -- obj )
+ console-i/o-port obj@ read-port ;
\ }}}
parse-str 160 expect cr
span @ parse-str-span !
else
- parse-str 160 current-input-port obj@ fileport>fid read-line
+ parse-str 160 current-input-port obj@ fileport>fid orig-read-line
drop swap parse-str-span !
parse-str-span @ 0= and if append-eof then
pop-parse-idx
;
+: ratnum? ( -- bool )
+ push-parse-idx
+
+ minus? plus? or if
+ inc-parse-idx
+ then
+
+ digit? invert if
+ pop-parse-idx false exit
+ else
+ inc-parse-idx
+ then
+
+ begin digit? while
+ inc-parse-idx
+ repeat
+
+ [char] / nextchar <> if
+ pop-parse-idx false exit
+ else
+ inc-parse-idx
+ then
+
+ digit? invert if
+ pop-parse-idx false exit
+ else
+ inc-parse-idx
+ then
+
+ begin digit? while
+ inc-parse-idx
+ repeat
+
+ delim? pop-parse-idx
+;
+
: boolean? ( -- bool )
nextchar [char] # <> if false exit then
: string? ( -- bool )
nextchar [char] " = ;
-: readfixnum ( -- num-atom )
+: readfixnum ( -- fixnum )
plus? minus? or if
minus?
inc-parse-idx
fixnum-type
;
+: readflonum ( -- flonum )
+ readfixnum drop
+ dup 0< swap abs i->f
+
+ [char] . nextchar = if
+ inc-parse-idx
+
+ 10.0 ( f exp )
+
+ begin digit? while
+ nextchar [char] 0 - i->f ( f exp d )
+ over f/ rot f+ ( exp f' )
+ swap 10.0 f* ( f' exp' )
+ inc-parse-idx
+ repeat
+
+ drop
+ then
+
+ [char] e nextchar = [char] E nextchar = or if
+ inc-parse-idx
+ 10.0
+ readfixnum drop i->f
+ f^ f*
+ then
+
+ swap if
+ -1.0 f*
+ then
+
+ flonum-type
+;
+
+: make-rational ( fixnum fixnum -- ratnum|fixnum )
+ drop swap drop
+ simplify
+
+ dup 1 = if
+ drop fixnum-type
+ else
+ fixnum-type swap fixnum-type
+ cons drop ratnum-type
+ then
+;
+
+: readratnum ( -- ratnum )
+ readfixnum inc-parse-idx readfixnum
+ make-rational
+;
+
: readbool ( -- bool-obj )
inc-parse-idx
;
: readstring ( -- charlist )
- nextchar [char] " = if
- inc-parse-idx
- delim? false = if
- bold fg red
- ." No delimiter following right double quote. Aborting." cr
- reset-term abort
+ nil nil
+
+ begin
+ nextchar [char] " <>
+ while
+ nextchar [char] \ = if
+ inc-parse-idx
+ nextchar case
+ [char] n of '\n' endof
+ [char] " of [char] " endof
+ [char] \
+ endcase
+ else
+ nextchar
then
+ inc-parse-idx character-type
+ nil cons
- dec-parse-idx
+ ( firstchar prevchar thischar )
- 0 nil-type exit
- then
+ 2swap nil? if
+ 2drop 2swap 2drop 2dup ( thischar thischar )
+ else
+ ( firstchar thischar prevchar )
+ 2over 2swap set-cdr! ( firstchar thischar )
+ then
+ repeat
- nextchar [char] \ = if
- inc-parse-idx
- nextchar case
- [char] n of '\n' endof
- [char] " of [char] " endof
- [char] \
- endcase
- else
- nextchar
+ \ Discard previous character
+ 2drop
+
+ inc-parse-idx
+ delim? false = if
+ bold fg red
+ ." No delimiter following right double quote. Aborting." cr
+ reset-term abort
then
- inc-parse-idx character-type
- recurse
+ dec-parse-idx
- cons
+ nil? if
+ nil cons
+ then
+ drop string-type
;
: readsymbol ( -- charlist )
exit
then
+ flonum? if
+ readflonum
+ exit
+ then
+
+ ratnum? if
+ readratnum
+ exit
+ then
+
boolean? if
readbool
exit
inc-parse-idx
readstring
- drop string-type
nextchar [char] " <> if
bold red ." Missing closing double-quote." reset-term cr
: self-evaluating? ( obj -- obj bool )
boolean-type istype? if true exit then
fixnum-type istype? if true exit then
+ flonum-type istype? if true exit then
+ ratnum-type istype? if true exit then
character-type istype? if true exit then
string-type istype? if true exit then
nil-type istype? if true exit then
\ ---- Print ---- {{{
-: printfixnum ( fixnumobj -- ) drop 0 .R ;
+: printfixnum ( fixnum -- ) drop 0 .R ;
+
+: printflonum ( flonum -- ) drop f. ;
-: printbool ( numobj -- )
+: printratnum ( ratnum -- )
+ drop pair-type 2dup
+ car print ." /" cdr print
+;
+
+: printbool ( bool -- )
drop if
." #t"
else
:noname ( obj -- )
fixnum-type istype? if printfixnum exit then
+ flonum-type istype? if printflonum exit then
+ ratnum-type istype? if printratnum exit then
boolean-type istype? if printbool exit then
character-type istype? if printchar exit then
string-type istype? if printstring exit then
primitive-proc-type istype? if printprim exit then
compound-proc-type istype? if printcomp exit then
none-type istype? if printnone exit then
+ port-type istype? if printport exit then
recoverable-exception throw" Tried to print object with unknown type."
; is print
string-type istype? if true exit then
symbol-type istype? if true exit then
compound-proc-type istype? if true exit then
+ port-type istype? if true exit then
false
;
;
:noname
- \ ." GC! "
+ ." GC! "
gc-unmark
symbol-table obj@ gc-mark-obj
macro-table obj@ gc-mark-obj
+ console-i/o-port obj@ gc-mark-obj
global-env obj@ gc-mark-obj
depth gc-stack-depth @ do
\ ---- Loading files ---- {{{
-: charlist>cstr ( charlist addr -- n )
-
- dup 2swap ( origaddr addr charlist )
-
- begin
- nil? false =
- while
- 2dup cdr 2swap car
- drop ( origaddr addr charlist char )
- -rot 2swap ( origaddr charlist addr char )
- over !
- 1+ -rot ( origaddr nextaddr charlist )
- repeat
-
- 2drop ( origaddr finaladdr )
- swap -
-;
-
: load ( addr n -- finalResult )
open-input-file
;
: repl
- cr ." Welcome to scheme.forth.jl!" cr
- ." Use Ctrl-D to exit." cr
empty-parse-str
enable-gc
+ \ Display welcome message
+ welcome-symbol nil cons global-env obj@ eval 2drop
+
begin
['] repl-body catch
case