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wal-phisics · 3 years

Text

subleq.fth

only forth definitions hex

system +order

variable meta.1

variable target.1

variable assembler.1

variable target.only.1

meta.1 +order definitions

2 constant =cell

4000 constant size

8000 constant =end

40 constant =stksz

100 constant =buf

0008 constant =bksp

000A constant =lf

000D constant =cr

007F constant =del

create tflash size cells here over erase allot

variable tdp

variable tep

variable tlast

size =cell - tep !

0 tlast !

: :m meta.1 +order definitions : ;

: ;m postpone ; ; immediate

:m there tdp @ ;m

:m tc! tflash + c! ;m

:m tc@ tflash + c@ ;m

:m t! over $FF and over tc! swap 8 rshift swap 1+ tc! ;m

:m t@ dup tc@ swap 1+ tc@ 8 lshift or ;m

:m taligned dup 1 and + ;m

:m talign there 1 and tdp +! ;m

:m tc, there tc! 1 tdp +! ;m

:m t, there t! 2 tdp +! ;m

:m $literal

talign [char] " word count dup tc, for aft count tc, then next drop talign ;m

:m tallot tdp +! ;m

:m parse-word bl word ?nul count ;m

:m thead

talign

there tlast @ t, tlast !

parse-word talign dup tc, for aft count tc, then next drop talign ;m

:m #dec dup >r abs 0 <# $A hold #s r> sign #> type ;m ( n -- print number )

:m mdump aligned begin ?dup while swap dup @ #dec cell+ swap cell - repeat drop ;m

:m save-target parse-word drop decimal tflash there mdump ;m

:m .end only forth definitions decimal ;m

:m setlast tlast ! ;m

:m atlast tlast @ ;m

:m tvar

get-current >r meta.1 set-current create r> set-current there , t, does> @ ;m

:m label:

get-current >r meta.1 set-current create r> set-current there , does> @ ;m

:m tdown =cell negate and ;m

:m tnfa =cell + ;m ( pwd -- nfa : move to name field address )

:m tcfa tnfa dup c@ $1F and + =cell + tdown ;m ( pwd -- cfa )

:m compile-only tlast @ tnfa t@ $20 or tlast @ tnfa t! ;m ( -- )

:m immediate tlast @ tnfa t@ $40 or tlast @ tnfa t! ;m ( -- )

:m half dup 1 and abort" unaligned" 2/ ;m

:m double 2* ;m

:m (') bl word find ?found cfa ;m

:m t' (') >body @ ;m

:m to' target.only.1 +order (') >body @ target.only.1 -order ;m

:m tcksum taligned dup $C0DE - $FFFF and >r

begin ?dup while swap dup t@ r> + $FFFF and >r =cell + swap =cell - repeat

drop r> ;m

:m mkck dup there swap - tcksum ;m

system -order

\ ---------------------------------- Forth VM --------------------------------

:m Z 0 t, ;m \ Address 0 must contain 0

:m NADDR there 2/ 1+ t, ;m

:m HALT 0 t, 0 t, -1 t, ;m

:m JMP 2/ Z Z t, ;m

:m ADD swap 2/ t, Z NADDR Z 2/ t, NADDR Z Z NADDR ;m

:m SUB swap 2/ t, 2/ t, NADDR ;m

:m NOP Z Z NADDR ;m

:m ZERO dup 2/ t, 2/ t, NADDR ;m

:m PUT 2/ t, -1 t, NADDR ;m

:m MOV 2/ >r r@ dup t, t, NADDR 2/ t, Z NADDR r> Z t, NADDR Z Z NADDR ;m

:m iLOAD there 2/ 3 4 * 3 + + 2* MOV 0 swap MOV ;m

:m iJMP there 2/ E + 2* MOV NOP ;m

:m iSTORE ( addr w -- )

swap >r there 2/ 24 + 2dup 2* MOV 2dup 1+ 2* MOV 7 + 2* MOV r> 0 MOV ;m

assembler.1 +order definitions

: begin talign there ;

: again JMP ;

: mark there 0 t, ;

: if ( NB. "if" does not work for 8000 )

2/ dup t, Z there 2/ 4 + dup t, Z Z 6 + t, Z Z NADDR Z t, mark ;

: until 2/ dup t, Z there 2/ 4 + dup t, Z Z 6 + t, Z Z NADDR Z t, 2/ t, ;

: +if Z 2/ t, mark ;

: -if 2/ t, Z there 2/ 4 + t, Z Z there 2/ 4 + t, Z Z mark ;

: then begin 2/ swap t! ;

: while if swap ;

: repeat JMP then ;

assembler.1 -order

meta.1 +order definitions

0 t, 0 t, \ both locations must be zero

label: entry \ used to set entry point in next cell

-1 t, \ system entry point

B tvar {options} \ bit #1=echo off, #2 = checksum on, #4=info, #8=die on EOF

0 tvar h \ dictionary pointer

0 tvar primitive \ any address lower than this one must be a primitive

0 tvar check \ used for system checksum

8000 tvar hbit \ must contain 8000

-2 tvar ntwo \ must contain -2

-1 tvar neg1 \ must contain -1

1 tvar one \ must contain 1

2 tvar two \ must contain 1

$10 tvar bwidth \ must contain 16

0 tvar INVREG \ temporary register used for inversion only

0 tvar {cold} \ entry point of virtual machine program, set later on

0 tvar {key} \ execution vector for key?

0 tvar {emit} \ execution vector for emit

0 tvar {literal} \ execution vector for literal

0 tvar {ok} \ execution vector for .ok

0 tvar {echo} \ execution vector for echo

0 tvar ip \ instruction pointer

0 tvar w \ working pointer

0 tvar x \ working pointer

0 tvar t \ temporary register for Virtual Machine

0 tvar bl1 \ bitwise extra register

0 tvar bl2 \ bitwise extra register

0 tvar bt \ bitwise extra register

0 tvar tos \ top of stack

0 tvar {state} \ compiler state

0 tvar {hld} \ hold space pointer

$A tvar {base} \ input/output radix

-1 tvar {dpl} \ number of places after fraction

0 tvar {in} \ position in query string

0 tvar {handler} \ throw/catch handler

0 tvar {last} \ last defined word

0 tvar #tib \ terminal input buffer

0 tvar {context} $E tallot \ vocabulary context

0 tvar {current} \ vocabulary which new definitions are added to

0 tvar {forth-wordlist} \ forth word list (main vocabulary)

0 tvar {root-voc} \ absolute minimum vocabulary

0 tvar {system} \ system functions vocabulary

=end dup tvar {sp0} tvar {sp} \ grows downwards

=end =stksz 4 * - dup tvar {rp0} tvar {rp} \ grows upwards

=end =stksz 4 * - =buf - constant TERMBUF \ pad buffer space

TERMBUF =buf + constant =tbufend

:m INC 2/ neg1 2/ t, t, NADDR ;m ( b -- )

:m DEC 2/ one 2/ t, t, NADDR ;m ( b -- )

:m INV ( b -- : invert NB. b - a = b + ~a + 1 )

INVREG ZERO dup INVREG SUB dup INVREG swap MOV DEC ;m

:m ++sp {sp} DEC ;m

:m --sp {sp} INC ;m

:m --rp {rp} DEC ;m

:m ++rp {rp} INC ;m

:m a-optim >r there =cell - r> 2/ t! ;m

assembler.1 +order

label: start

start 2/ entry t!

{sp0} {sp} MOV

{rp0} {rp} MOV

{cold} ip MOV

( fall-through )

label: vm ( Forth Inner Interpreter )

ip w MOV

ip INC

t w iLOAD

t w MOV

primitive t SUB

t -if w iJMP then ( jump straight to VM functions )

++rp

ip {rp} iSTORE

w ip MOV vm a-optim

vm JMP

assembler.1 -order

:m header >in @ thead >in ! ;m

:m :ht ( "name" -- : forth routine, no header )

get-current >r target.1 set-current create

r> set-current $BABE talign there ,

does> @ 2/ t, ;m

:m :t header :ht ;m ( "name" -- : forth routine )

:m :to ( "name" -- : forth, target only routine )

header

get-current >r target.only.1 set-current create r> set-current

$BABE talign there ,

does> @ 2/ t, ;m

:m :a ( "name" -- : assembly routine, no header )

D00D

target.1 +order definitions

create talign there , assembler.1 +order does> @ 2/ t, ;m

:m (a); D00D <> if abort" unstructured" then assembler.1 -order ;m

:m ;a (a); vm a-optim vm JMP ;m

:m postpone target.only.1 +order t' target.only.1 -order 2/ t, ;m

\ NB. There are some bugs with the comparison operators "op<" and "op>" when

\ they deal with extreme values like "$8000 1 <", "$8002 1 <" words fine.

:a bye HALT ;a

:a 1- tos DEC ;a

:a 1+ tos INC ;a

:a invert tos INV ;a

:a [@] tos tos iLOAD ;a

:a [!] w {sp} iLOAD w tos iSTORE --sp tos {sp} iLOAD --sp ;a

:a opEmit tos PUT tos {sp} iLOAD --sp ;a

:a opPush ++sp tos {sp} iSTORE tos ip iLOAD ip INC ;a

:a opSwap tos w MOV tos {sp} iLOAD w {sp} iSTORE ;a

:a opDup ++sp tos {sp} iSTORE ;a

:a opOver w {sp} iLOAD ++sp tos {sp} iSTORE w tos MOV ;a

:a opDrop tos {sp} iLOAD --sp ;a

:a opToR ++rp tos {rp} iSTORE tos {sp} iLOAD --sp ;a

:a opFromR ++sp tos {sp} iSTORE tos {rp} iLOAD --rp ;a

:a opMul w {sp} iLOAD t ZERO

begin w while tos t ADD w DEC repeat t tos MOV --sp ;a

:a opExit ip {rp} iLOAD --rp ;a

:a - w {sp} iLOAD tos w SUB w tos MOV --sp ;a

:a + w {sp} iLOAD w tos ADD --sp ;a

:a r@ ++sp tos {sp} iSTORE tos {rp} iLOAD ;a

:a rdrop --rp ;a

:a sp@ ++sp tos {sp} iSTORE {sp} tos MOV tos INC ;a

:a sp! tos {sp} MOV ;a

:a rp@ ++sp tos {sp} iSTORE {rp} tos MOV ;a

:a rp! tos {rp} MOV tos {sp} iLOAD --sp ;a

:a opNext w {rp} iLOAD

w if w DEC w {rp} iSTORE t ip iLOAD t ip MOV vm JMP then ip INC --rp ;a

:a lsb

tos tos ADD tos tos ADD tos tos ADD tos tos ADD

tos tos ADD tos tos ADD

tos w MOV 0 tos MOV w if neg1 tos MOV then ;a

:a opJump ip ip iLOAD ;a

:a opJumpZ

tos w MOV 0 t MOV w if neg1 t MOV then w DEC w +if neg1 t MOV then

tos {sp} iLOAD --sp t if ip INC vm JMP then w ip iLOAD w ip MOV ;a

:a op0> tos w MOV 0 tos MOV w +if neg1 tos MOV then ;a

:a op0=

tos w MOV neg1 tos MOV w if 0 tos MOV then w DEC w +if 0 tos MOV then ;a

:a op0<

tos w MOV 0 tos MOV w -if neg1 tos MOV then w INC w -if neg1 tos MOV then ;a

:a op< w {sp} iLOAD --sp tos w SUB 0 tos MOV w -if neg1 tos MOV then ;a

:a op> w {sp} iLOAD --sp tos w SUB 0 tos MOV w +if neg1 tos MOV then ;a

:a op2* tos tos ADD ;a

:a op2/

bwidth w MOV

x ZERO

begin w DEC w while

x x ADD

tos bt MOV 0 bl1 MOV bt -if neg1 bl1 MOV then bt INC bt -if neg1 bl1 MOV then

bl1 if x INC then

tos tos ADD

repeat

x tos MOV ;a

:a rshift

bwidth w MOV

tos w SUB

tos {sp} iLOAD --sp

x ZERO

begin w while

x x ADD

tos bt MOV 0 bl1 MOV bt -if neg1 bl1 MOV then bt INC bt -if neg1 bl1 MOV then

bl1 if x INC then

tos tos ADD

w DEC

repeat

x tos MOV ;a

:a opOr

bwidth w MOV

x ZERO

t {sp} iLOAD

--sp

begin w while

x x ADD

tos bt MOV 0 bl1 MOV bt -if neg1 bl1 MOV then bt INC bt -if neg1 bl1 MOV then

t bt MOV 0 bl2 MOV bt -if neg1 bl2 MOV then bt INC bt -if neg1 bl2 MOV then

bl1 bl2 ADD bl2 if x INC then

t t ADD

tos tos ADD

w DEC

repeat

x tos MOV ;a

:a opXor

bwidth w MOV

x ZERO

t {sp} iLOAD

--sp

begin w while

x x ADD

tos bt MOV 0 bl1 MOV bt -if neg1 bl1 MOV then bt INC bt -if neg1 bl1 MOV then

t bt MOV 0 bl2 MOV bt -if neg1 bl2 MOV then bt INC bt -if neg1 bl2 MOV then

bl1 bl2 ADD bl2 INC one bl1 MOV bl2 if 0 bl1 MOV then bl1 x ADD

t t ADD

tos tos ADD

w DEC

repeat

x tos MOV ;a

:a opAnd

bwidth w MOV

x ZERO

t {sp} iLOAD

--sp

begin w while

x x ADD

tos bt MOV 0 bl1 MOV bt -if neg1 bl1 MOV then bt INC bt -if neg1 bl1 MOV then

t bt MOV 0 bl2 MOV bt -if neg1 bl2 MOV then bt INC bt -if neg1 bl2 MOV then

bl1 bl2 ADD two bl2 ADD one bl1 MOV bl2 if 0 bl1 MOV then bl1 x ADD

t t ADD

tos tos ADD

w DEC

repeat

x tos MOV ;a

there 2/ primitive t!

:m ;t $BABE <>

if abort" unstructured" then talign opExit target.only.1 -order ;m

:m :s tlast @ {system} t@ tlast ! $F00D :t drop 0 ;m

:m :so tlast @ {system} t@ tlast ! $F00D :to drop 0 ;m

:m ;s drop $BABE ;t $F00D <> if abort" unstructured" then

tlast @ {system} t! tlast ! ;m

:m :r tlast @ {root-voc} t@ tlast ! $F00D :t drop 0 ;m

:m ;r drop $BABE ;t $F00D <> if abort" unstructured" then

tlast @ {root-voc} t! tlast ! ;m

:m lit opPush t, ;m

:m [char] char opPush t, ;m

:m char char opPush t, ;m

:m begin talign there ;m

:m until talign opJumpZ 2/ t, ;m

:m again talign opJump 2/ t, ;m

:m if opJumpZ there 0 t, ;m

:m mark opJump there 0 t, ;m

:m then there 2/ swap t! ;m

:m else mark swap then ;m

:m while if ;m

:m repeat swap again then ;m

:m aft drop mark begin swap ;m

:m next talign opNext 2/ t, ;m

:m for opToR begin ;m

:m =push [ t' opPush half ] literal ;m

:m =jump [ t' opJump half ] literal ;m

:m =jumpz [ t' opJumpZ half ] literal ;m

:m =unnest [ t' opExit half ] literal ;m

:m =>r [ t' opToR half ] literal ;m

:m =next [ t' opNext half ] literal ;m

:m dup opDup ;m

:m drop opDrop ;m

:m over opOver ;m

:m swap opSwap ;m

:m >r opToR ;m

:m r> opFromR ;m

:m 0> op0> ;m

:m 0= op0= ;m

:m 0< op0< ;m

:m < op< ;m

:m > op> ;m

:m or opOr ;m

:m xor opXor ;m

:m and opAnd ;m

:m exit opExit ;m

:m 2/ op2/ ;m

:ht #0 0 lit ;t

:ht #1 1 lit ;t

:ht #-1 FFFF lit ;t

:to 1+ 1+ ;t

:to 1- 1- ;t

:to + + ;t

:to - - ;t

:to invert invert ;t

:to bye bye ;t

:to dup dup ;t

:to drop opDrop ;t

:to over opOver ;t

:to swap opSwap ;t

:to rshift rshift ;t

:so [@] [@] ;s

:so [!] [!] ;s

:so lsb lsb ;s

:to sp@ sp@ ;t

:to sp! sp! ;t

:to 0> op0> ;t

:to 0= op0= ;t

:to 0< op0< ;t

:to < op< ;t

:to > op> ;t

:to 2/ op2/ ;t

:to or opOr ;t

:to xor opXor ;t

:to and opAnd ;t

:to * opMul ;t

:t nop ;t

:t <ok> {ok} lit ;t

:s <emit> {emit} lit ;s

:s <key> {key} lit ;s

:s <literal> {literal} lit ;s

:s <cold> {cold} lit ;s

:s <echo> {echo} lit ;s

:t current {current} lit ;t

:t root-voc {root-voc} lit ;t

:t #vocs 8 lit ;t

:t context {context} lit ;t

:t here h half lit [@] ;t

:t base {base} lit ;t

:t dpl {dpl} lit ;t

:t hld {hld} lit ;t

:t bl 20 lit ;t

:t >in {in} lit ;t

:t hex $10 lit {base} half lit [!] ;t

:t decimal $A lit {base} half lit [!] ;t

:t source TERMBUF lit #tib half lit [@] ;t

:s many #0 {in} half lit [!] ;s

:t state {state} lit ;t

:t ] #-1 {state} half lit [!] ;t

:t [ #0 {state} half lit [!] ;t immediate

:t nip swap drop ;t

:t tuck swap over ;t

:t ?dup dup if dup then ;t

:t rot >r swap r> swap ;t

:t -rot rot rot ;t

:t 2drop drop drop ;t

:t 2dup over over ;t

:t 0<= 0> 0= ;t

:t 0<> 0= 0= ;t

:t = - 0= ;t

:t <> = 0= ;t

:t >= < 0= ;t

:t <= > 0= ;t

:t 0>= 0< 0= ;t

:t negate 1- invert ;t

:t s>d dup 0< ;t

:t abs s>d if negate then ;t

:t 2* op2* ;t

:t cell 2 lit ;t

:t cell+ cell + ;t

:t cells op2* ;t

:t u< 2dup 0< 0= swap 0< 0= <> >r < r> <> ;t

:t u> swap u< ;t

:t u>= u< 0= ;t

:t u<= u> 0= ;t

:t execute 2/ >r ;t

:t key? #-1 [@] negate s>d if

{options} half lit [@] 8 lit and if bye then drop #0 exit then #-1 ;t

:t key begin {key} half lit [@] execute until ;t

:t emit {emit} half lit [@] execute ;t

:t cr =cr lit emit =lf lit emit ;t

:t @ 2/ [@] ;t

:t ! 2/ [!] ;t

:t get-current current @ ;t

:t set-current current ! ;t

:s last get-current @ ;s

:t pick sp@ + [@] ;t

:t +! 2/ tuck [@] + swap [!] ;t

:t lshift begin ?dup while 1- swap 2* swap repeat ;t

:t c@ dup @ swap lsb if 8 lit rshift else $FF lit and then ;t

:t c! swap $FF lit and dup 8 lit lshift or swap

tuck dup @ swap lsb 0= $FF lit xor

>r over xor r> and xor swap ! ;t

:t max 2dup < if nip else drop then ;t

:t min 2dup > if nip else drop then ;t

:t count dup 1+ swap c@ ;t

:s logical 0<> if #1 else #0 then ;s

:t aligned dup lsb logical + ;t

:t align here aligned h half lit [!] ;t

:t +string #1 over min rot over + rot rot - ;t

:t type begin dup while swap count emit swap 1- repeat 2drop ;t

:t cmove for aft >r dup c@ r@ c! 1+ r> 1+ then next 2drop ;t ( b1 b2 u -- )

:t fill swap for swap aft 2dup c! 1+ then next 2drop ;t ( b u c -- )

:t erase #0 fill ;t ( NB. blank is bl fill )

:s do$ r> r> 2* dup count + aligned 2/ >r swap >r ;s ( -- a : )

:s ($) do$ ;s ( -- a : do string NB. )

:s .$ do$ count type ;s ( -- : print string, next cells contain string )

:m ." .$ $literal ;m

:m $" ($) $literal ;m

:t space bl emit ;t

:t catch ( xt -- exception# | 0 \ return addr on stack )

sp@ >r ( xt ) \ save data stack pointer

{handler} half lit [@] >r ( xt ) \ and previous handler

rp@ {handler} half lit [!] ( xt ) \ set current handler

execute ( ) \ execute returns if no throw

r> {handler} half lit [!] ( ) \ restore previous handler

rdrop ( ) \ discard saved stack ptr

#0 ;t ( 0 ) \ normal completion

:t throw ( ??? exception# -- ??? exception# )

?dup if ( exc# ) \ 0 throw is no-op

{handler} half lit [@] rp! ( exc# ) \ restore prev return stack

r> {handler} half lit [!] ( exc# ) \ restore prev handler

r> swap >r ( saved-sp ) \ exc# on return stack

sp! drop r> ( exc# ) \ restore stack

then ;t

:t abort #-1 throw ;t

:s (abort) do$ swap if count type abort then drop ;s

:t um+

2dup + >r r@ #0 >= >r 2dup and 0< r> or >r or 0< r> and invert 1+ r> swap ;t

:t dnegate invert >r invert #1 um+ r> + ;t ( d -- d )

:t d+ >r swap >r um+ r> + r> + ;t ( d d -- d )

:t um* ( u u -- ud : double cell width multiply )

#0 swap ( u1 0 u2 ) $F lit

for

dup um+ >r >r dup um+ r> + r>

if >r over um+ r> + then

next rot drop ;t

:t um/mod ( ud u -- ur uq : unsigned double cell width divide/modulo )

?dup 0= if -A lit throw then

2dup u<

if negate $F lit

for >r dup um+ >r >r dup um+ r> + dup

r> r@ swap >r um+ r> ( or -> ) 0<> swap 0<> +

if >r drop 1+ r> else drop then r>

drop swap exit

then 2drop drop #-1 dup ;t

:t m/mod ( d n -- r q : floored division )

s>d dup >r

negate >r dnegate r>

then

>r s>d if r@ + then r> um/mod r>

if swap negate swap exit then ;t

:t /mod over 0< swap m/mod ;t

:t mod /mod drop ;t

:t / /mod nip ;t

:s depth {sp0} half lit [@] sp@ - 1- ;s

:s (emit) opEmit ;s

:t echo {echo} half lit [@] execute ;t

:s tap dup echo over c! 1+ ;s ( bot eot cur c -- bot eot cur )

:s ktap ( bot eot cur c -- bot eot cur )

dup dup =cr lit <> >r =lf lit <> r> and if ( Not End of Line? )

dup =bksp lit <> >r =del lit <> r> and if ( Not Delete Char? )

bl tap

exit

then

>r over r@ < dup if

=bksp lit dup echo bl echo echo

then

r> +

exit

then drop nip dup ;s

:t accept ( b u -- b u : read in a line of user input )

over + over begin

2dup <>

while

key dup bl - $5F lit u< if tap else ktap then

repeat drop over - ;t

:t query TERMBUF lit =buf lit accept #tib lit ! drop #0 >in ! ;t

:s ?depth depth > if -4 lit throw then ;s ( u -- : check stack depth )

:t -trailing for aft bl over r@ + c@ < if r> 1+ exit then then next #0 ;t

:s look ( b u c xt -- b u : skip until *xt* test succeeds )

swap >r rot rot

begin

dup

while

over c@ r@ - r@ bl = 4 lit pick execute

if rdrop rot drop exit then

+string

repeat rdrop rot drop ;s

:s unmatch if 0> exit then 0<> ;s ( c1 c2 -- t )

:s match unmatch invert ;s ( c1 c2 -- t )

:t parse ( c -- b u ; <string> )

>r source drop >in @ + #tib lit @ >in @ - r@

>r over r> swap >r >r

r@ t' unmatch lit look 2dup

r> t' match lit look swap r> - >r - r> 1+ ( b u c -- b u delta )

>in +!

r> bl = if -trailing then #0 max ;t

:t spaces begin dup 0> while space 1- repeat drop ;t ( +n -- )

:t hold #-1 hld +! hld @ c! ;t ( c -- : save a character in hold space )

:t #> 2drop hld @ =tbufend lit over - ;t ( u -- b u )

:s extract dup >r um/mod r> swap >r um/mod r> rot ;s ( ud ud -- ud u )

:s digit 9 lit over < 7 lit and + [char] 0 + ;s ( u -- c )

:t # 2 lit ?depth #0 base @ extract digit hold ;t ( d -- d )

:t #s begin # 2dup ( d0= -> ) or 0= until ;t ( d -- 0 )

:t <# =tbufend lit hld ! ;t ( -- )

:t sign 0< if [char] - hold then ;t ( n -- )

:t u.r >r #0 <# #s #> r> over - spaces type ;t

:t u. #0 <# #s #> space type ;t

:t . dup >r abs #0 <# #s r> sign #> space type ;t ( n -- print number )

:t >number ( ud b u -- ud b u : convert string to number )

begin

2dup >r >r drop c@ base @ ( get next character )

( digit? -> ) >r [char] 0 - 9 lit over <

if 7 lit - dup $A lit < or then dup r> u< ( c base -- u f )

0= if ( d char )

drop ( d char -- d )

r> r> ( restore string )

exit ( ..exit )

then ( d char )

swap base @ um* drop rot base @ um* d+ ( accumulate digit )

r> r> ( restore string )

+string dup 0= ( advance string and test for end )

until ;t

:t number? ( a u -- d -1 | a u 0 : string to a number [easier to use] )

#-1 dpl !

base @ >r

over c@ [char] - = dup >r if +string then

over c@ [char] $ = if hex +string then

>r >r #0 dup r> r>

begin

>number dup

while over c@ [char] . <>

if rot drop rot r> 2drop #0 r> base ! exit then

1- dpl ! 1+ dpl @

repeat

2drop r> if dnegate then r> base ! #-1 ;t

:t compare ( a1 u1 a2 u2 -- n : string equality )

rot

over - ?dup if >r 2drop r> nip exit then

for ( a1 a2 )

aft

count rot count rot - ?dup

if rdrop nip nip exit then

then

next 2drop #0 ;t

:t .s depth for aft r@ pick . then next ;t

:t nfa cell+ ;t ( pwd -- nfa : move word pointer to name field )

:t cfa nfa dup c@ $1F lit and + cell+ cell negate and ;t ( pwd -- cfa )

:t allot aligned h lit +! ;t

:t , align here ! cell allot ;t

:s (search-wordlist) ( a wid -- PWD PWD 1|PWD PWD -1|0 a 0: find word in WID )

swap >r dup

begin

dup

while

dup nfa count $9F lit ( $1F:word-length + $80:hidden )

and r@ count compare 0=

if ( found! )

rdrop

dup ( immediate? -> ) nfa $40 lit swap @ and 0<>

#1 or negate exit

then

nip dup @

repeat

rdrop 2drop #0 ;s

:s (find) ( a -- pwd pwd 1 | pwd pwd -1 | 0 a 0 : find a word dictionary )

context

begin

dup @

while

dup @ @ r@ swap (search-wordlist) ?dup

>r rot drop r> rdrop exit

then

cell+

repeat drop #0 r> #0 ;s

:t search-wordlist (search-wordlist) rot drop ;t ( a wid -- PWD 1|PWD -1|a 0 )

:t find ( a -- pwd 1 | pwd -1 | a 0 : find a word in the dictionary )

(find) rot drop ;t

:s (literal) state @ if =push lit , , then ;s

:t literal <literal> @ execute ;t immediate ( u -- )

:t compile, 2/ align , ;t ( xt -- )

:s ?found

if exit then space count type [char] ? emit cr -D lit throw ;s ( u f -- )

:t interpret ( b -- )

find ?dup if

state @

0> if cfa execute exit then \ <- immediate word are executed

cfa compile, exit \ <- compiling word are...compiled.

then

drop

dup nfa c@ 20 lit and if -E lit throw then ( <- ?compile )

cfa execute exit \ <- if its not, execute it, then exit *interpreter*

then

\ not a word

dup >r count number? if rdrop \ it is a number!

dpl @ 0< if \ <- dpl will be -1 if it is a single cell number

drop \ drop high cell from 'number?' for single cell output

else \ <- dpl is not -1, it is a double cell number

state @ if swap then

postpone literal \ literal is executed twice if it's a double

then

postpone literal exit

then

r> #0 ?found ;t \ Could vector ?found here, to handle arbitrary words

:s .id nfa count $1F lit and type space ;s ( pwd -- : print out a word )

:t get-order ( -- widn ... wid1 n : get the current search order )

context

( find empty cell -> ) #0 >r begin dup @ r@ xor while cell+ repeat rdrop

dup cell - swap

context - 2/ dup >r 1- s>d if -50 lit throw then

for aft dup @ swap cell - then next @ r> ;t

:r set-order ( widn ... wid1 n -- : set the current search order )

dup #-1 = if drop root-voc #1 set-order exit then ( NB. Recursion! )

dup #vocs > if -49 lit throw then

context swap for aft tuck ! cell+ then next #0 swap ! ;r

:r forth-wordlist {forth-wordlist} lit ;r ( -- wid )

:r system {system} lit ;r ( -- wid )

:r forth root-voc forth-wordlist 2 lit set-order ;r ( -- )

:r only #-1 set-order ;r ( -- )

:r words

get-order begin ?dup while swap dup cr u. ." : " @

begin ?dup while dup nfa c@ $80 lit and 0= if dup .id then @ repeat cr

1- repeat ;r

:t definitions context @ set-current ;t

:t (order) ( w wid*n n -- wid*n w n )

dup if

1- swap >r (order) over r@ xor

1+ r> -rot exit

then rdrop

then ;t

:t -order get-order (order) nip set-order ;t

:t +order dup >r -order get-order r> swap 1+ set-order ;t

:t word parse here dup >r 2dup ! 1+ swap cmove r> ;t ( c -- b )

:s ?unique ( a -- a : print a message if a word definition is not unique )

dup get-current (search-wordlist) 0= if exit then space

2drop {last} lit @ .id ." redefined" cr ;s

:s ?nul dup c@ if exit then -10 lit throw ;s

:to char bl word ?nul count drop c@ ;t

:to [char] postpone char =push lit , , ;t immediate

:to ; $BABE lit <> if -16 lit throw then =unnest lit , postpone [

?dup if get-current ! exit then ;t immediate compile-only ( -- wid )

:to : align here dup {last} lit ! ( "name", -- colon-sys )

last , bl word ?nul ?unique count + h lit ! align $BABE lit postpone ] ;t

:to :noname here $BABE lit ] ;t

:to begin align here ;t immediate compile-only

:to until =jumpz lit , 2/ , ;t immediate compile-only

:to again =jump lit , 2/ , ;t immediate compile-only

:to if =jumpz lit , here #0 , ;t immediate compile-only

:to then here 2/ swap ! ;t immediate compile-only

:to while postpone if ;t immediate compile-only

:to repeat swap postpone again postpone then ;t immediate compile-only

:to else =jump lit , here #0 , swap postpone then ;t immediate compile-only

:to for =>r lit , here ;t immediate compile-only

:to aft drop =jump lit , here #0 , align here swap ;t immediate compile-only

:to next =next lit , 2/ , ;t immediate compile-only

:to ' bl word find ?found cfa literal ;t immediate

:t compile r> dup [@] , 1+ >r ;t compile-only

:t recurse {last} lit @ cfa compile, ;t immediate compile-only

:s toggle tuck @ xor swap ! ;s

:s hide bl word find ?found nfa $80 lit swap toggle ;s

:s (var) r> 2* ;s compile-only

:s (const) r> [@] ;s compile-only

:s (marker) r> 2* dup @ h lit ! cell+ @ get-current ! ;s compile-only

:t create postpone : drop postpone [ compile (var) get-current ! ;t

:to variable create #0 , ;t

:to constant create cell negate allot compile (const) , ;t

:to marker last here create cell negate allot compile (marker) , , ;t

:t >body cell+ ;t ( a -- a )

:s (does) r> r> 2* swap >r ;s compile-only

:s (comp) r> {last} lit @ cfa ! ;s compile-only

:t does> compile (comp) compile (does) ;t immediate compile-only

:to rp! compile rp! ;t immediate compile-only

:to rp@ compile rp@ ;t immediate compile-only

:to >r compile opToR ;t immediate compile-only

:to r> compile opFromR ;t immediate compile-only

:to r@ compile r@ ;t immediate compile-only

:to rdrop compile rdrop ;t immediate compile-only

:to exit compile opExit ;t immediate compile-only

:to ." compile .$

[char] " word count + h half lit [!] align ;t immediate compile-only

:to $" compile ($)

[char] " word count + h half lit [!] align ;t immediate compile-only

:to abort" compile (abort)

[char] " word count + h half lit [!] align ;t immediate compile-only

:to ( [char] ) parse 2drop ;t immediate

:to .( [char] ) parse type ;t immediate

:to postpone bl word find ?found cfa compile, ;t immediate

:to ) ;t immediate

:to \ source drop @ {in} half lit [!] ;t immediate

:to immediate last nfa @ $40 lit or last nfa ! ;t

:to see bl word find ?found

cr begin dup @ =unnest lit <> while dup @ u. cell+ repeat @ u. ;t

:to dump aligned begin ?dup while swap dup @ . cell+ swap cell - repeat drop ;t

:s cksum aligned dup $C0DE lit - >r

begin ?dup while swap dup @ r> + >r cell+ swap cell - repeat drop r> ;s

:s ok state @ 0= if ." ok" cr then ;s

:t eval

begin bl word dup c@ while

interpret #1 ?depth

repeat drop {ok} half lit [@] execute ;t ( "word" -- )

:s info cr

." Project: eForth v1.5 " ( here . ) cr

." Author: Richard James Howe" cr

." Email: [email protected]" cr

." Repo: https://github.com/howerj/subleq" cr

." License: The Unlicense / Public Domain" cr ;s

:s ini only forth definitions decimal postpone [

#0 {in} half lit [!] #-1 {dpl} half lit [!] ;s ( -- )

:s opts

{options} half lit [@] lsb if to' drop lit {echo} half lit [!] then

{options} half lit [@] 4 lit and if info then

{options} half lit [@] 2 lit and if

primitive half lit [@] 2* dup here swap - cksum

check half lit [@] <> if ." cksum fail" bye then

{options} half lit [@] 2 lit xor {options} half lit [!]

then ;s

:t quit ( -- : interpreter loop, and more, does more than most QUITs )

ini

opts

begin

query t' eval lit catch

?dup if dup space . [char] ? emit cr #-1 = if bye then ini then

again ;t

:t cold {cold} half lit [@] execute ;t

\ ---------------------------------- Image Generation ------------------------

t' quit half {cold} t!

t' key? {key} t!

t' (emit) {echo} t!

t' (emit) {emit} t!

t' ok {ok} t!

t' (literal) {literal} t!

atlast {forth-wordlist} t!

{forth-wordlist} {current} t!

there h t!

primitive t@ double mkck check t!

atlast {last} t!

save-target subleq.dec

there .end

bye

#programacion subleq

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