home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
Almathera Ten Pack 3: CDPD 3
/
Almathera Ten on Ten - Disc 3: CDPD3.iso
/
fish
/
001-100
/
001-025
/
003
/
cforth
/
forth.dict
< prev
next >
Wrap
Text File
|
1995-03-17
|
18KB
|
1,043 lines
PRIM EXECUTE 0 ( cfa -- <execute word> )
PRIM LIT 1 ( push the next value to the stack )
PRIM BRANCH 2 ( branch by offset in next word )
PRIM 0BRANCH 3 ( branch if zero by off. in next word )
PRIM (LOOP) 4 ( end of a <DO> )
PRIM (+LOOP) 5 ( inc -- <end of a <DO> w/increment != 1 )
PRIM (DO) 6 ( limit init -- <begin a DO loop> )
PRIM I 7 ( get loop index <R> )
PRIM DIGIT 8 ( c -- DIGIT 1 | 0 <convert digit> )
PRIM (FIND) 9 ( s -- s 0 | s NFA 1 <find word s> )
PRIM ENCLOSE 10 ( addr c -- addr next first last <not quite> )
PRIM KEY 11 ( -- c <get next char from input> )
PRIM (EMIT) 12 ( c -- <put char to output> )
PRIM ?TERMINAL 13 ( see if op. interrupted <like w/^C> )
PRIM CMOVE 14 ( src dest count -- <move words>)
PRIM U* 15 ( unsigned multiply )
PRIM U/ 16 ( unsigned divide )
PRIM AND 17 ( a b -- a&b )
PRIM OR 18 ( a b -- a|b )
PRIM XOR 19 ( a b -- a%b )
PRIM SP@ 20 ( -- sp )
PRIM SP! 21 ( -- <store empty value to sp> )
PRIM RP@ 22 ( -- rp )
PRIM RP! 23 ( -- <store empty value to rp> )
PRIM ;S 24 ( -- <pop r stack <end colon def'n>> )
PRIM LEAVE 25 ( -- <set index = limit for a loop> )
PRIM >R 26 ( a -- <push a to r stack> )
PRIM R> 27 ( -- a <pop a from r stack )
PRIM 0= 28 ( a -- !a <logical not> )
PRIM 0< 29 ( a -- a<0 )
PRIM + 30 ( a b -- a+b )
PRIM D+ 31 ( ahi alo bhi blo -- a+bhi a+blo )
PRIM MINUS 32 ( a -- -a )
PRIM DMINUS 33 ( ahi alo -- <-a>hi <-a>lo )
PRIM OVER 34 ( a b -- a b a )
PRIM DROP 35 ( a -- )
PRIM SWAP 36 ( a b -- b a )
PRIM DUP 37 ( a -- a a )
PRIM 2DUP 38 ( a b -- a b a b )
PRIM +! 39 ( val addr -- < *addr += val > )
PRIM TOGGLE 40 ( addr mask -- <*addr %= mask> )
PRIM @ 41 ( addr -- *addr )
PRIM C@ 42 ( addr -- *addr )
PRIM 2@ 43 ( addr -- *addr+1 *addr )
PRIM ! 44 ( val addr -- <*addr = val> )
PRIM C! 45 ( val addr -- <*addr = val> )
PRIM 2! 46 ( bhi blo addr -- <*addr=blo, *addr+1=bhi )
PRIM DOCOL 47 ( goes into CF of : definitions )
PRIM DOCON 48 ( goes into CF of constants )
PRIM DOVAR 49 ( goes into CF of variables )
PRIM DOUSE 50 ( goes into CF of user variables )
PRIM - 51 ( a b -- a-b )
PRIM = 52 ( a b -- a==b)
PRIM != 53 ( a b -- a!=b)
PRIM < 54 ( a b -- a<b )
PRIM ROT 55 ( a b c -- c a b )
PRIM DODOES 56 ( place holder; this value goes into CF )
PRIM DOVOC 57
PRIM R 58 ( same as I, but must be a primitive )
PRIM ALLOT 59 ( primitive because of mem. management )
PRIM (BYE) 60 ( executes exit <pop[]>; )
PRIM TRON 61 ( depth -- trace to this depth )
PRIM TROFF 62 ( stop tracing )
PRIM DOTRACE 63 ( trace once )
PRIM (R/W) 64 ( BUFFER FLAG ADDR -- read if flag=1, write/0 )
PRIM (SAVE) 65 ( Save current environment )
PRIM (COLD) 66
( end of primitives )
CONST 0 0
CONST 1 1
CONST 2 2
CONST 3 3
CONST -1 -1
CONST BL 32 ( A SPACE, OR BLANK )
CONST C/L 64
CONST B/BUF 1024
CONST B/SCR 1
CONST #BUFF 5 ( IMPLEMENTATION DEPENDENT )
CONST WORDSIZE 1 ( EXTENSION: WORDSIZE IS THE NUMBER OF BYTES IN A WORD.
USUALLY, THIS IS TWO, BUT WITH PSEUDO-MEMORY
ADDRESSED AS AN ARRAY OF WORDS, IT'S ONE. )
CONST FIRST 0 ( ADDRESS OF THE FIRST BUFFER AND END OF BUFFER SPACE )
CONST LIMIT 0 ( the reader fills these in with INITR0 and DPBASE )
USER S0 24
USER R0 25
USER TIB 26
USER WIDTH 27
USER WARNING 28
USER FENCE 29
USER DP 30
USER VOC-LINK 31
USER BLK 32
USER IN 33
USER ERRBLK 34
USER ERRIN 35
USER OUT 36
USER SCR 37
USER OFFSET 38
USER CONTEXT 39
USER CURRENT 40
USER STATE 41
USER BASE 42
USER DPL 43
USER FLD 44
USER CSP 45
USER R# 46
USER HLD 47
VAR USE 0 ( These two are filled in by COLD )
VAR PREV 0 ( to the same as the constant FIRST )
CONST SEC/BLK 1
: EMIT
(EMIT)
1 OUT +! ;
: CR
LIT 13 EMIT
LIT 10 EMIT
0 OUT ! ;
: NOP ; ( DO-NOTHING )
: +ORIGIN ; ( ADD ORIGIN OF SYSTEM; IN THIS CASE, 0 )
: 1+
1 + ;
: 2+
2 + ;
: 1-
1 - ;
: ++ ( ADDR -- <INCREMENTS VAL AT ADDR> )
1 SWAP +! ; ( MY OWN EXTENSION )
: -- ( ADDR -- <DECREMENTS VAL AT ADDR> )
-1 SWAP +! ; ( MY OWN EXTENSION )
: HERE ( -- DP )
DP @ ;
: , ( V -- <PLACES V AT DP AND INCREMENTS DP>)
HERE !
WORDSIZE ALLOT ; ( CHANGE FROM MODEL FOR WORDSIZE )
: C, ( C -- <COMPILE A CHARACTER. SAME AS , WHEN WORDSIZE=1> )
HERE C!
1 ALLOT ;
: U< ( THIS IS TRICKY. )
2DUP XOR 0< ( SIGNS DIFFERENT? )
0BRANCH U1 ( NO: GO TO U1 )
DROP 0< 0= ( YES; ANSWER IS [SECOND > 0] )
BRANCH U2 ( SKIP TO U2 <END OF WORD> )
LABEL U1
- 0< ( SIGNS ARE THE SAME. JUST SUBTRACT
AND TEST NORMALLY )
LABEL U2
;
: > ( CHEAP TRICK )
SWAP < ;
: <> ( NOT-EQUAL )
!= ;
: SPACE ( EMIT A SPACE )
BL EMIT
;
: -DUP ( V -- V | V V <DUPLICATE IF V != 0> )
DUP
0BRANCH DDUP1 ( SKIP TO END IF IT WAS ZERO )
DUP
LABEL DDUP1
;
: TRAVERSE ( A DIR -- A <TRAVERSE A WORD FROM NFA TO LFA
<DIR = 1> OR LFA TO NFA <DIR = -1> )
SWAP
LABEL T1
OVER ( BEGIN )
+
LIT 0x7F OVER C@ < ( HIGH BIT CLEAR? )
0BRANCH T1 ( UNTIL )
SWAP DROP ;
: LATEST ( NFA OF LAST WORD DEFINED )
CURRENT @ @ ;
: LFA ( GO FROM PFA TO LFA )
2 - ; ( 2 IS WORDSIZE*2 )
: CFA ( GO FROM PFA TO CFA )
WORDSIZE - ;
: NFA ( GO FROM PFA TO NFA )
3 - ( NOW AT LAST CHAR )
-1 TRAVERSE ; ( 3 IS WORDSIZE*3 )
: PFA ( GO FROM NFA TO PFA )
1 TRAVERSE ( NOW AT LAST CHAR )
3 + ; ( 3 IS WORDSIZE*3 )
: !CSP ( SAVE CSP AT USER VAR CSP )
SP@ CSP ! ;
: (ABORT)
ABORT
;
: ERROR ( N -- <ISSUE ERROR #N> )
WARNING @ 0< ( WARNING < 0 MEANS <ABORT> )
0BRANCH E1
(ABORT) ( IF )
LABEL E1
HERE COUNT TYPE (.") "?" ( THEN )
MESSAGE
SP! ( EMPTY THE STACK )
BLK @ -DUP ( IF LOADING, STORE IN & BLK )
0BRANCH E2
ERRBLK ! IN @ ERRIN ! ( IF )
LABEL E2
QUIT ( THEN )
;
: ?ERROR ( F N -- <IF F, DO ERROR #N> )
SWAP
0BRANCH QERR1
ERROR ( IF <YOU CAN'T RETURN FROM ERROR> )
LABEL QERR1
DROP ( THEN )
;
: ?COMP ( GIVE ERR#17 IF NOT COMPILING )
STATE @ 0= LIT 17 ?ERROR
;
: ?EXEC ( GIVE ERR#18 IF NOT EXECUTING )
STATE @ LIT 18 ?ERROR
;
: ?PAIRS ( GIVE ERR#19 IF PAIRS DON'T MATCH )
- LIT 19 ?ERROR
;
: ?CSP ( GIVE ERR#20 IF CSP & SP DON'T MATCH )
SP@ CSP @ - LIT 20 ?ERROR
;
: ?LOADING ( GIVE ERR#21 IF NOT LOADING )
BLK @ 0= LIT 22 ?ERROR
;
: COMPILE ( COMPILE THE CFA OF THE NEXT WORD TO DICT )
?COMP
R> DUP ( GET OUR RETURN ADDRESS )
WORDSIZE + >R ( SKIP NEXT; ORIG. ADDR STILL ON TOS )
@ ,
;
: [ ( BEGIN EXECUTING )
0 STATE !
;*
: ] ( END EXECUTING )
LIT 0xC0 STATE !
;*
: SMUDGE ( TOGGLE COMPLETION BIT OF LATEST WORD )
LATEST ( WHEN THIS BIT=1, WORD CAN'T BE FOUND )
LIT 0x20 TOGGLE
;
: :
( DEFINE A WORD )
?EXEC
!CSP
CURRENT @ CONTEXT !
CREATE ] ( MAKE THE WORD HEADER AND BEGIN COMPILING )
(;CODE) DOCOL
;*
: ; ( END A DEFINITION )
?CSP ( CHECK THAT WE'RE DONE )
COMPILE ;S ( PLACE ;S AT THE END )
SMUDGE [ ( MAKE THE WORD FINDABLE AND BEGIN INTERPRETING )
;*
: CONSTANT
CREATE SMUDGE ,
(;CODE) DOCON
;
: VARIABLE
CONSTANT
(;CODE) DOVAR
;
: USER
CONSTANT
(;CODE) DOUSE
;
: HEX ( GO TO HEXADECIMAL BASE )
LIT 0x10 BASE ! ;
: DECIMAL ( GO TO DECIMAL BASE )
LIT 0x0A BASE !
;
: ;CODE ( unused without an assembler )
?CSP COMPILE (;CODE) [ NOP ( "ASSEMBLER" might go where nop is )
;*
: (;CODE) ( differs from the normal def'n )
R> @ @ LATEST PFA CFA !
;
: <BUILDS ( UNSURE )
0 CONSTANT ; ( NOTE CONSTANT != CONST )
: DOES> ( UNSURE )
R> LATEST PFA !
(;CODE) DODOES
;
: COUNT ( ADDR -- ADDR+1 COUNT )
DUP 1+ SWAP C@ ; ( CONVERTS THE <STRING> ADDR TO A FORM SUITABLE
FOR "TYPE" )
: TYPE
-DUP
0BRANCH TYPE1
OVER + SWAP ( GET START .. END ADDRS )
(DO)
LABEL TYPE2
I C@ EMIT
(LOOP) TYPE2
BRANCH TYPE3
LABEL TYPE1
DROP
LABEL TYPE3
;
: -TRAILING ( addr count -- addr count <count adjusted to
exclude trailing blanks> )
DUP 0 (DO) ( DO )
LABEL TRAIL1
OVER OVER + 1 - C@ BL -
0BRANCH TRAIL2
LEAVE BRANCH TRAIL3 ( IF )
LABEL TRAIL2
1 - ( ELSE )
LABEL TRAIL3
(LOOP) TRAIL1 ( THEN LOOP )
;
: (.") ( PRINT A COMPILED STRING )
R COUNT
DUP 1+ R> + >R TYPE
;
: ." ( COMPILE A STRING IF COMPILING,
OR PRINT A STRING IF INTERPRETING )
LIT '"'
STATE @
0BRANCH QUOTE1
COMPILE (.") WORD HERE C@ 1+ ALLOT ( IF )
BRANCH QUOTE2
LABEL QUOTE1
WORD HERE COUNT TYPE ( ELSE )
LABEL QUOTE2
;* ( THEN )
: EXPECT ( MODIFIED EXPECT lets UNIX input editing & echoing )
( change EMIT to DROP below if not -echo )
OVER + OVER ( start of input buffer is on top of stack )
DUP 0 SWAP C! ( smack a zero at the start to catch empty lines )
(DO) ( above is an added departure <read "hack"> )
LABEL EXPEC1
KEY
( Comment this region out if using stty cooked )
DUP LIT 8 = 0BRANCH EXPEC2
DROP DUP I = DUP R> 2 - + >R 0BRANCH EXPEC6
LIT 7 BRANCH EXPEC7
LABEL EXPEC6
LIT 8 ( output for backspace )
LABEL EXPEC7
BRANCH EXPEC3
( End of region to comment out for stty cooked )
LABEL EXPEC2
DUP LIT '\n' = 0BRANCH EXPEC4 ( IF )
LEAVE DROP BL 0 BRANCH EXPEC5
LABEL EXPEC4 ( ELSE )
DUP
LABEL EXPEC5 ( THEN )
I C! 0 I 1+ !
LABEL EXPEC3
EMIT ( use DROP here for stty echo, EMIT for -echo )
(LOOP) EXPEC1
DROP
;
: QUERY
TIB @ ( ADDRESS OF BUFFER )
B/BUF ( SIZE OF BUFFER )
EXPECT ( GET A LINE )
0 IN ! ( PREPARE FOR INTERPRET )
;
: {NUL} ( THIS GETS TRANSLATED INTO A SINGLE NULL BYTE )
BLK @
0BRANCH NULL1
BLK ++ 0 IN ! ( IF )
BLK @ B/SCR 1 - AND 0=
0BRANCH NULL2
?EXEC
R> ( IF )
DROP
LABEL NULL2
BRANCH NULL3 ( ENDIF ELSE )
LABEL NULL1
R> DROP
LABEL NULL3 ( ENDIF )
;*
: FILL ( START COUNT VALUE -- <FILL COUNT WORDS, FROM START,
WITH VALUE )
SWAP -DUP
0BRANCH FILL1
SWAP ROT SWAP OVER C! ( IF <NON-NULL COUNT> )
DUP 1+ ROT 1 -
CMOVE
BRANCH FILL2
LABEL FILL1
DROP DROP
LABEL FILL2
;
: ERASE ( START COUNT -- <ZERO OUT MEMORY> )
0 FILL
;
: BLANKS ( START COUNT -- <FILL WITH BLANKS> )
BL FILL
;
: HOLD ( C -- <PLACE C AT --HLD> )
HLD -- HLD @ C!
;
: PAD ( -- ADDR <OF PAD SPACE> )
HERE LIT 0x44 +
;
: WORD ( C -- <GET NEXT WORD TO END OF DICTIONARY,
DELIMITED WITH C OR NULL )
( LOADING PART OF THIS IS COMMENTED OUT )
BLK @ -DUP
0BRANCH W1
BLOCK ( IF loading )
BRANCH W2
LABEL W1
TIB @ ( ELSE )
LABEL W2 ( ENDIF )
IN @ + SWAP ENCLOSE ( GET THE WORD )
HERE LIT 0x22 BLANKS ( BLANK SPACE AFTER WORD )
IN +! OVER - >R R HERE C! + HERE 1+ R> CMOVE
;
: (NUMBER)
LABEL NUM1
1+
DUP >R C@ BASE @ DIGIT
0BRANCH NUM2 ( WHILE )
SWAP BASE @ U* DROP
ROT BASE @ U* D+
DPL @ 1+
0BRANCH NUM3
DPL ++ ( IF )
LABEL NUM3
R> ( ENDIF )
BRANCH NUM1 ( REPEAT )
LABEL NUM2
R>
;
: NUMBER
0 0 ROT DUP 1+ C@
LIT '-' = DUP >R + -1
LABEL N1 ( BEGIN )
DPL ! (NUMBER) DUP C@ BL !=
0BRANCH N2 ( WHILE )
DUP C@ LIT '0' != 0 ?ERROR 0 ( . )
BRANCH N1 ( REPEAT )
LABEL N2
DROP R>
0BRANCH N3 ( IF )
DMINUS
LABEL N3 ( ENDIF )
;
: -FIND
BL WORD ( HERE CONTEXT @ @ <FIND> DUP 0= 0BRANCH FIND1 DROP )
HERE LATEST (FIND)
( LABEL FIND1 )
;
: ID. ( NFA -- <PRINT ID OF A WORD > )
PAD LIT 0x5F BLANKS
DUP PFA LFA OVER - PAD SWAP CMOVE
PAD COUNT LIT 0x1F AND TYPE SPACE
;
: CREATE ( MAKE A HEADER FOR THE NEXT WORD )
-FIND
0BRANCH C1
DROP NFA ID. LIT 4 MESSAGE SPACE ( NOT UNIQUE )
LABEL C1
HERE DUP C@ WIDTH @ MIN 1+ ALLOT ( MAKE ROOM )
DUP LIT 0xA0 TOGGLE ( MAKE IT UNFINDABLE )
HERE 1 - LIT 0x80 TOGGLE ( SET HI BIT )
LATEST , ( DO LF )
CURRENT @ ! ( UPDATE FOR LATEST )
LIT 999 , ( COMPILE ILLEGAL VALUE TO CODE FIELD )
;
: [COMPILE] ( COMPILE THE NEXT WORD, EVEN IF IT'S IMMEDIATE )
-FIND 0= 0 ?ERROR DROP CFA ,
;*
: LITERAL
STATE @
0BRANCH L1
COMPILE LIT ,
LABEL L1
;*
: DLITERAL
STATE @
0BRANCH D1
SWAP LITERAL LITERAL
LABEL D1
;*
: ?STACK ( ERROR IF STACK OVERFLOW OR UNDERFLOW )
S0 @ SP@ U< 1 ?ERROR ( SP > S0 MEANS UNDERFLOW )
SP@ TIB @ U< LIT 7 ?ERROR ( SP < R0 MEANS OVERFLOW: THIS IS IMPLEMENTATION-
DEPENDENT; I KNOW THAT THE CS IS JUST
ABOVE THE TIB. )
;
: INTERPRET
LABEL I1
-FIND ( BEGIN )
0BRANCH I2
STATE @ < ( IF )
0BRANCH I3
CFA , ( IF )
BRANCH I4
LABEL I3
CFA EXECUTE ( ELSE )
LABEL I4
?STACK ( ENDIF )
BRANCH I5
LABEL I2
HERE NUMBER DPL @ 1+
0BRANCH I6
DLITERAL ( IF )
BRANCH I7
LABEL I6
DROP LITERAL ( ELSE )
LABEL I7
?STACK ( ENDIF ENDIF )
LABEL I5
BRANCH I1 ( AGAIN )
;
: IMMEDIATE ( MAKE MOST-RECENT WORD IMMEDIATE )
LATEST LIT 0x40 TOGGLE
;
( *** These are commented out because we don't handle vocabularies ***
: VOCABULARY
<BUILDS LIT 0xA081 ,
CURRENT @ CFA , HERE VOC-LINK @ , VOC-LINK ! DOES>
WORDSIZE + CONTEXT !
;
: DEFINITIONS
CONTEXT @ CURRENT !
;
*** End of commenting-out *** )
: ( ( COMMENT )
LIT ')' ( CLOSING PAREN )
WORD
;*
: QUIT
0 BLK ! [
LABEL Q1
RP! CR QUERY INTERPRET ( BEGIN )
STATE @ 0=
0BRANCH Q2
(.") "OK" ( IF )
LABEL Q2
BRANCH Q1 ( ENDIF AGAIN )
;
: ABORT
SP! DECIMAL ?STACK CR
.CPU ( PRINT THE GREETING )
( FORTH )
QUIT
;
: COLD
(COLD)
VOC-LINK @ CONTEXT ! ( INITIALIZE CONTEXT )
CONTEXT @ CURRENT ! ( MAKE CONTEXT CURRENT )
FIRST USE !
FIRST PREV !
EMPTY-BUFFERS
1 WARNING ! ( USE SCREEN 4 FOR ERROR MESSAGES )
ABORT
;
: WARM
EMPTY-BUFFERS
ABORT
;
: S->D
DUP 0<
0BRANCH S2D1
-1 ( HIGH WORD IS ALL 1S )
BRANCH S2D2
LABEL S2D1
0
LABEL S2D2
;
: +-
0<
0BRANCH PM1
MINUS
LABEL PM1
;
: D+-
0<
0BRANCH DPM1
DMINUS
LABEL DPM1
;
: ABS
DUP +-
;
: DABS
DUP D+-
;
: MIN
2DUP >
0BRANCH MIN1
SWAP
LABEL MIN1
DROP
;
: MAX
2DUP <
0BRANCH MAX1
SWAP
LABEL MAX1
DROP
;
( MATH STUFF )
: M*
2DUP XOR >R ABS SWAP ABS U* R> D+-
;
: M/
OVER >R >R DABS R ABS U/
R> R XOR +- SWAP
R> +- SWAP
;
: * ( MULTIPLY, OF COURSE )
M* DROP
;
: /MOD
>R S->D R> M/
;
: / ( DIVIDE <AND CONQUOR> )
/MOD SWAP DROP
;
: MOD
/MOD DROP
;
: */MOD
>R M* R> M/
;
: */
*/MOD
SWAP DROP
;
: M/MOD
>R 0 R U/ R> SWAP >R U/ R>
;
( END OF MATH STUFF )
: (LINE) ( LINE SCR -- ADDR C/L )
>R C/L B/BUF */MOD R> B/SCR * + BLOCK +
C/L
;
: .LINE ( LINE SCR -- )
(LINE) -TRAILING TYPE
;
: MESSAGE
WARNING @ 0BRANCH MSG1
-DUP 0BRANCH MSG2 ( message # 0 is no message at all )
LIT 4 OFFSET @ B/SCR / - .LINE SPACE ( messages are on screen 4 )
BRANCH MSG2
LABEL MSG1
(.") "MSG # " .
LABEL MSG2
;
( DISK-ORIENTED WORDS )
: +BUF
LIT 1028 ( 1K PLUS 4 BYTES OVERHEAD, CO from defines )
+ DUP LIMIT = 0BRANCH P1
DROP FIRST
LABEL P1
DUP PREV @ -
;
: UPDATE ( MARK BUFFER AS MODIFIED )
PREV @ @ LIT 0X8000 OR PREV @ !
;
: EMPTY-BUFFERS
FIRST LIMIT OVER - ERASE
;
: BUFFER
USE @ DUP >R
LABEL BUF1
+BUF 0BRANCH BUF1 ( LOOP UNTIL +BUF RETURNS NONZERO )
USE ! R @ 0< 0BRANCH BUF2 ( SEE IF IT'S DIRTY <sign bit is dirty bit> )
R 2+ R @ LIT 0X7FFF AND 0 R/W ( WRITE THIS DIRTY BUFFER )
LABEL BUF2
R !
R PREV !
R> 2+
;
: BLOCK
OFFSET @ + >R PREV @ DUP @ R - DUP +
0BRANCH BLOCK1
LABEL BLOCK2
+BUF 0=
0BRANCH BLOCK3
DROP R BUFFER DUP R 1 R/W 2 -
LABEL BLOCK3
DUP @ R - DUP + 0= 0BRANCH BLOCK2
DUP PREV !
LABEL BLOCK1
R> DROP 2+
;
: R/W ( ADDR F BUFNO -- read if F=1, write if 0 )
(R/W)
;
: FLUSH
#BUFF 1+ 0 (DO)
LABEL FLUSH1
0 BUFFER DROP
(LOOP) FLUSH1
;
: LOAD
BLK @ >R IN @ >R 0 IN !
B/SCR * BLK !
INTERPRET
R> IN ! R> BLK !
;
: -->
(.") "--> "
?LOADING 0 IN ! B/SCR BLK @ OVER MOD - BLK +!
;*
: '
-FIND 0= 0 ?ERROR DROP LITERAL
;*
: FORGET
CURRENT @ CONTEXT @ - LIT 24 ?ERROR
' DUP FENCE @ < LIT 21 ?ERROR
DUP NFA DP ! LFA @ CONTEXT @ !
;
( COMPILING WORDS )
: BACK
HERE - ,
;
: BEGIN
?COMP HERE 1
;*
: ENDIF
?COMP 2 ?PAIRS HERE OVER - SWAP !
;*
: THEN
ENDIF
;*
: DO
COMPILE (DO) HERE LIT 3
;*
: LOOP
LIT 3 ?PAIRS COMPILE (LOOP) BACK
;*
: +LOOP
LIT 3 ?PAIRS ?COMP COMPILE (+LOOP) BACK
;*
: UNTIL
1 ?PAIRS COMPILE 0BRANCH BACK
;*
: END
UNTIL
;*
: AGAIN
?COMP
1 ?PAIRS COMPILE BRANCH BACK
;*
: REPEAT
?COMP
>R >R AGAIN R> R> 2 -
ENDIF
;*
: IF
COMPILE 0BRANCH HERE 0 , 2
;*
: ELSE
2 ?PAIRS COMPILE BRANCH HERE 0 , SWAP 2 ENDIF 2
;*
: WHILE
IF 2+
;*
: SPACES
0 MAX -DUP 0BRANCH SPACES1
0 (DO)
LABEL SPACES2
SPACE
(LOOP) SPACES2
LABEL SPACES1
;
: <#
PAD HLD !
;
: #>
DROP DROP HLD @ PAD OVER -
;
: SIGN
ROT 0< 0BRANCH SIGN1
LIT '-' HOLD
LABEL SIGN1
;
: #
BASE @ M/MOD ROT LIT 9 OVER < 0BRANCH #1
LIT 7 + ( 7 is offset to make 'A' come after '9')
LABEL #1
LIT '0' + HOLD
;
: #S
LABEL #S1
# 2DUP OR 0= 0BRANCH #S1
;
: D.R
>R SWAP OVER DABS <# #S SIGN #> R> OVER - SPACES TYPE
;
: .R
>R S->D R> D.R
;
: D.
0 D.R SPACE
;
: .
S->D D.
;
: ?
@ .
;
: U.
0 D.
;
: VLIST
C/L 1+ OUT ! CONTEXT @ @
LABEL VLIST1 ( BEGIN )
OUT @ C/L > 0BRANCH VLIST2 ( IF )
CR
LABEL VLIST2 ( THEN )
DUP ID. SPACE PFA LFA @
DUP 0= ?TERMINAL OR 0BRANCH VLIST1 ( UNTIL )
DROP
;
: .CPU
(.") "C-CODED FORTH INTERPRETER" ( special string handling )
;
: BYE
CR (.") "EXIT FORTH" CR
0 (BYE)
;
: LIST
DECIMAL CR
DUP SCR ! (.") "SCR # " .
LIT 16 0 (DO)
LABEL LIST1
CR I 3 .R SPACE
I SCR @ .LINE
?TERMINAL 0BRANCH LIST2
LEAVE
LABEL LIST2
(LOOP) LIST1
CR
;
: CASE
?COMP CSP @ !CSP LIT 4
;*
: OF
?COMP LIT 4 ?PAIRS
COMPILE OVER COMPILE = COMPILE 0BRANCH
HERE 0 ,
COMPILE DROP
LIT 5
;*
: ENDOF
?COMP
LIT 5 ?PAIRS
COMPILE BRANCH
HERE 0 ,
SWAP 2 ENDIF LIT 4
;*
: ENDCASE
?COMP
LIT 4 ?PAIRS
COMPILE DROP
LABEL ENDC1 ( BEGIN )
SP@ CSP @ != 0BRANCH ENDC2 ( WHILE )
2 ENDIF
BRANCH ENDC1 ( REPEAT )
LABEL ENDC2
CSP !
;*
: \ ( REMAINER OF THE LINE IS A COMMENT )
?LOADING
IN @ C/L / 1+ C/L * IN !
;*
: ALIAS ( usage: ALIAS NEW OLD; makes already-compiled references )
( to OLD refer to NEW. Restrictions: OLD must have been a )
( colon-definition, and it must not have been of the form )
( { : OLD ; } where the first word of the PFA is ;S . )
' CFA
' DUP
2 - @ LIT DOCOL != LIT 27 ?ERROR ( ERROR IF NOT A COLON DEFINITION )
DUP @ LIT ;S = LIT 28 ?ERROR ( MAKE SURE ;S IS NOT THE FIRST WORD )
DUP >R ! LIT ;S R> 2+ !
;
: REFORTH ( GET & EXECUTE ONE FORTH LINE <PERHAPS A NUMBER> )
IN @ >R BLK @ >R
0 IN ! 0 BLK !
QUERY INTERPRET
R> BLK ! R> IN !
;
( The vocabulary word FORTH will be compiled after the dictionary is read,
with a pointer to the last word in the dictionary, which will be itself. )