1: \ KERNAL.FS ANS figFORTH kernal 17dec92py
2: \ $ID:
3: \ Idea and implementation: Bernd Paysan (py)
4: \ Copyright 1992 by the ANSI figForth Development Group
5:
6: \ Log: ', '- usw. durch [char] ... ersetzt
7: \ man sollte die unterschiedlichen zahlensysteme
8: \ mit $ und & zumindest im interpreter weglassen
9: \ schon erledigt!
10: \ 11may93jaw
11: \ name> 0= nicht vorhanden 17may93jaw
12: \ nfa can be lfa or nfa!
13: \ find splited into find and (find)
14: \ (find) for later use 17may93jaw
15: \ search replaced by lookup because
16: \ it is a word of the string wordset
17: \ 20may93jaw
18: \ postpone added immediate 21may93jaw
19: \ to added immediate 07jun93jaw
20: \ cfa, header put "here lastcfa !" in
21: \ cfa, this is more logical
22: \ and noname: works wothout
23: \ extra "here lastcfa !" 08jun93jaw
24: \ (parse-white) thrown out
25: \ refill added outer trick
26: \ to show there is something
27: \ going on 09jun93jaw
28: \ leave ?leave somebody forgot UNLOOP!!! 09jun93jaw
29: \ leave ?leave unloop thrown out
30: \ unloop after loop is used 10jun93jaw
31:
32: HEX
33:
34: \ Bit string manipulation 06oct92py
35:
36: Create bits 80 c, 40 c, 20 c, 10 c, 8 c, 4 c, 2 c, 1 c,
37: DOES> ( n -- ) + c@ ;
38:
39: : >bit ( addr n -- c-addr mask ) 8 /mod rot + swap bits ;
40: : +bit ( addr n -- ) >bit over c@ or swap c! ;
41:
42: : relinfo ( -- addr ) forthstart dup @ + ;
43: : >rel ( addr -- n ) forthstart - ;
44: : relon ( addr -- ) relinfo swap >rel cell / +bit ;
45:
46: \ here allot , c, A, 17dec92py
47:
48: : here ( -- here ) dp @ ;
49: : allot ( n -- ) dp +! ;
50: : c, ( c -- ) here 1 chars allot c! ;
51: : , ( x -- ) here cell allot ! ;
52: : 2, ( w1 w2 -- ) \ general
53: here 2 cells allot 2! ;
54:
55: : aligned ( addr -- addr' )
56: [ cell 1- ] Literal + [ -1 cells ] Literal and ;
57: : align ( -- ) here dup aligned swap ?DO bl c, LOOP ;
58:
59: : A! ( addr1 addr2 -- ) dup relon ! ;
60: : A, ( addr -- ) here cell allot A! ;
61:
62: \ on off 23feb93py
63:
64: : on ( addr -- ) true swap ! ;
65: : off ( addr -- ) false swap ! ;
66:
67: \ name> found 17dec92py
68:
69: : (name>) ( nfa -- cfa ) count $1F and + aligned ;
70: : name> ( nfa -- cfa )
71: dup (name>) swap c@ $80 and 0= IF @ THEN ;
72:
73: : found ( nfa -- cfa n ) cell+
74: dup c@ >r (name>) r@ $80 and 0= IF @ THEN
75: \ -1 r@ $40 and IF 1- THEN
76: -1 r> $20 and IF negate THEN ;
77:
78: \ (find) 17dec92py
79:
80: \ : (find) ( addr count nfa1 -- nfa2 / false )
81: \ BEGIN dup WHILE dup >r
82: \ cell+ count $1F and dup >r 2over r> =
83: \ IF -text 0= IF 2drop r> EXIT THEN
84: \ ELSE 2drop drop THEN r> @
85: \ REPEAT nip nip ;
86:
87: \ place bounds 13feb93py
88:
89: : place ( addr len to -- ) over >r rot over 1+ r> move c! ;
90: : bounds ( beg count -- end beg ) over + swap ;
91:
92: \ input stream primitives 23feb93py
93:
94: : tib >tib @ ;
95: Defer source
96: : (source) ( -- addr count ) tib #tib @ ;
97: ' (source) IS source
98:
99: \ (word) 22feb93py
100:
101: : scan ( addr1 n1 char -- addr2 n2 ) >r
102: BEGIN dup WHILE over c@ r@ <> WHILE 1 /string
103: REPEAT THEN rdrop ;
104: : skip ( addr1 n1 char -- addr2 n2 ) >r
105: BEGIN dup WHILE over c@ r@ = WHILE 1 /string
106: REPEAT THEN rdrop ;
107:
108: : (word) ( addr1 n1 char -- addr2 n2 )
109: dup >r skip 2dup r> scan nip - ;
110:
111: \ (word) should fold white spaces
112: \ this is what (parse-white) does
113:
114: \ word parse 23feb93py
115:
116: : parse-word ( char -- addr len )
117: source 2dup >r >r >in @ /string
118: rot dup bl = IF drop (parse-white) ELSE (word) THEN
119: 2dup + r> - 1+ r> min >in ! ;
120: : word ( char -- addr )
121: parse-word here place bl here count + c! here ;
122:
123: : parse ( char -- addr len )
124: >r source >in @ /string over swap r> scan >r
125: over - dup r> IF 1+ THEN >in +! ;
126:
127: \ name 13feb93py
128:
129: : capitalize ( addr -- addr )
130: dup count chars bounds
131: ?DO I c@ toupper I c! 1 chars +LOOP ;
132: : (name) ( -- addr ) bl word ;
133:
134: \ Literal 17dec92py
135:
136: : Literal ( n -- ) state @ 0= ?EXIT postpone lit , ;
137: immediate
138: : ALiteral ( n -- ) state @ 0= ?EXIT postpone lit A, ;
139: immediate
140:
141: : char ( 'char' -- n ) bl word char+ c@ ;
142: : [char] ( 'char' -- n ) char postpone Literal ; immediate
143: ' [char] Alias Ascii immediate
144:
145: : (compile) ( -- ) r> dup cell+ >r @ A, ;
146: : postpone ( "name" -- )
147: name find dup 0= abort" Can't compile "
148: 0> IF A, ELSE postpone (compile) A, THEN ;
149: immediate restrict
150:
151: \ Use (compile) for the old behavior of compile!
152:
153: \ digit? 17dec92py
154:
155: : digit? ( char -- digit true/ false )
156: base @ $100 = ?dup ?EXIT
157: toupper [char] 0 - dup 9 u> IF
158: [ 'A '9 1 + - ] literal -
159: dup 9 u<= IF
160: drop false EXIT
161: THEN
162: THEN
163: dup base @ u>= IF
164: drop false EXIT
165: THEN
166: true ;
167:
168: : accumulate ( +d0 addr digit - +d1 addr )
169: swap >r swap base @ um* drop rot base @ um* d+ r> ;
170: : >number ( d addr count -- d addr count )
171: 0 ?DO count digit? WHILE accumulate LOOP 0
172: ELSE 1- I' I - UNLOOP THEN ;
173:
174: \ number? number 23feb93py
175:
176: Create bases 10 , 2 , A , 100 ,
177: \ 16 2 10 Zeichen
178: \ !! this saving and restoring base is an abomination! - anton
179: : getbase ( addr u -- addr' u' ) over c@ [char] $ - dup 4 u<
180: IF cells bases + @ base ! 1 /string ELSE drop THEN ;
181: : number? ( string -- string 0 / n -1 ) base @ >r
182: dup count over c@ [char] - = dup >r IF 1 /string THEN
183: getbase dpl on 0 0 2swap
184: BEGIN dup >r >number dup WHILE dup r> - WHILE
185: dup dpl ! over c@ [char] . = WHILE
186: 1 /string
187: REPEAT THEN 2drop 2drop rdrop false r> base ! EXIT THEN
188: 2drop rot drop rdrop r> IF dnegate THEN
189: dpl @ dup 0< IF nip THEN r> base ! ;
190: : s>d ( n -- d ) dup 0< ;
191: : number ( string -- d )
192: number? ?dup 0= abort" ?" 0< IF s>d THEN ;
193:
194: \ space spaces ud/mod 21mar93py
195: decimal
196: Create spaces bl 80 times \ times from target compiler! 11may93jaw
197: DOES> ( u -- ) swap
198: 0 max 0 ?DO I' I - &80 min 2dup type +LOOP drop ;
199: hex
200: : space 1 spaces ;
201:
202: : ud/mod ( ud1 u2 -- urem udquot ) >r 0 r@ um/mod r> swap >r
203: um/mod r> ;
204:
205: : pad ( -- addr )
206: here [ $20 8 2* cells + 2 + cell+ ] Literal + aligned ;
207:
208: \ hold <# #> sign # #s 25jan92py
209:
210: : hold ( char -- ) pad cell - -1 chars over +! @ c! ;
211:
212: : <# pad cell - dup ! ;
213:
214: : #> ( 64b -- addr +n ) 2drop pad cell - dup @ tuck - ;
215:
216: : sign ( n -- ) 0< IF [char] - hold THEN ;
217:
218: : # ( +d1 -- +d2 ) base @ 2 max ud/mod rot 9 over <
219: IF [ char A char 9 - 1- ] Literal + THEN [char] 0 + hold ;
220:
221: : #s ( +d -- 0 0 ) BEGIN # 2dup d0= UNTIL ;
222:
223: \ print numbers 07jun92py
224:
225: : d.r >r tuck dabs <# #s rot sign #>
226: r> over - spaces type ;
227:
228: : ud.r >r <# #s #> r> over - spaces type ;
229:
230: : .r >r s>d r> d.r ;
231: : u.r 0 swap ud.r ;
232:
233: : d. 0 d.r space ;
234: : ud. 0 ud.r space ;
235:
236: : . s>d d. ;
237: : u. 0 ud. ;
238:
239: \ catch throw 23feb93py
240: \ bounce 08jun93jaw
241:
242: \ !! what about the other stacks (FP, locals) anton
243: \ !! allow the user to add rollback actions anton
244: \ !! use a separate exception stack? anton
245:
246: : catch ( x1 .. xn xt -- y1 .. ym 0 / z1 .. zn error )
247: >r sp@ r> swap \ don't count xt! jaw
248: >r handler @ >r rp@ handler ! execute
249: r> handler ! rdrop 0 ;
250: : throw ( y1 .. ym error/0 -- y1 .. ym / z1 .. zn )
251: dup 0= IF drop EXIT THEN
252: handler @ rp! r> handler ! r> swap >r sp! r> ;
253: \ Bouncing is very fine,
254: \ programming without wasting time... jaw
255: : bounce ( y1 .. ym error/0 -- y1 .. ym / z1 .. zn )
256: \ a throw without data stack restauration? anton !! stack diagram bad
257: dup 0= IF drop EXIT THEN
258: handler @ rp! r> handler ! r> drop ;
259:
260: \ ?stack 23feb93py
261:
262: : ?stack ( ?? -- ?? ) sp@ s0 @ > IF -4 throw THEN ;
263: \ ?stack should be code -- it touches an empty stack!
264:
265: \ interpret 10mar92py
266:
267: Defer parser
268: Defer name ' (name) IS name
269: Defer notfound
270:
271: : no.extensions ( string -- ) IF &-13 bounce THEN ;
272:
273: ' no.extensions IS notfound
274:
275: : interpret
276: BEGIN ?stack name dup c@ WHILE parser REPEAT drop ;
277:
278: \ interpreter compiler 30apr92py
279:
280: : interpreter ( name -- ) find ?dup
281: IF 1 and IF execute EXIT THEN -&14 throw THEN
282: number? 0= IF notfound THEN ;
283:
284: ' interpreter IS parser
285:
286: : compiler ( name -- ) find ?dup
287: IF 0> IF execute EXIT THEN compile, EXIT THEN number? dup
288: IF 0> IF swap postpone Literal THEN postpone Literal
289: ELSE drop notfound THEN ;
290:
291: : [ ['] interpreter IS parser state off ; immediate
292: : ] ['] compiler IS parser state on ;
293:
294: \ Structural Conditionals 12dec92py
295:
296: : ?struc ( flag -- ) abort" unstructured " ;
297: : sys? ( sys -- ) dup 0= ?struc ;
298: : >mark ( -- sys ) here 0 , ;
299: : >resolve ( sys -- ) here over - swap ! ;
300: : <resolve ( sys -- ) here - , ;
301:
302: : BUT sys? swap ; immediate restrict
303: : YET sys? dup ; immediate restrict
304:
305: \ Structural Conditionals 12dec92py
306:
307: : AHEAD postpone branch >mark ; immediate restrict
308: : IF postpone ?branch >mark ; immediate restrict
309: : ?DUP-IF \ general
310: \ This is the preferred alternative to the idiom "?DUP IF", since it can be
311: \ better handled by tools like stack checkers
312: postpone ?dup postpone IF ; immediate restrict
313: : ?DUP-NOT-IF \ general
314: postpone ?dup postpone 0= postpone if ; immediate restrict
315: : THEN sys? dup @ ?struc >resolve ; immediate restrict
316: ' THEN alias ENDIF immediate restrict \ general
317: \ Same as "THEN". This is what you use if your program will be seen by
318: \ people who have not been brought up with Forth (or who have been
319: \ brought up with fig-Forth).
320:
321: : ELSE sys? postpone AHEAD swap postpone THEN ;
322: immediate restrict
323:
324: : BEGIN here ; immediate restrict
325: : WHILE sys? postpone IF swap ; immediate restrict
326: : AGAIN sys? postpone branch <resolve ; immediate restrict
327: : UNTIL sys? postpone ?branch <resolve ; immediate restrict
328: : REPEAT over 0= ?struc postpone AGAIN postpone THEN ;
329: immediate restrict
330:
331: \ Structural Conditionals 12dec92py
332:
333: Variable leavings
334:
335: : (leave) here leavings @ , leavings ! ;
336: : LEAVE postpone branch (leave) ; immediate restrict
337: : ?LEAVE postpone 0= postpone ?branch (leave) ;
338: immediate restrict
339:
340: : DONE ( addr -- ) leavings @
341: BEGIN 2dup u<= WHILE dup @ swap >resolve REPEAT
342: leavings ! drop ; immediate restrict
343:
344: \ Structural Conditionals 12dec92py
345:
346: : DO postpone (do) here ; immediate restrict
347:
348: : ?DO postpone (?do) (leave) here ;
349: immediate restrict
350: : FOR postpone (for) here ; immediate restrict
351:
352: : loop] dup <resolve 2 cells - postpone done postpone unloop ;
353:
354: : LOOP sys? postpone (loop) loop] ; immediate restrict
355: : +LOOP sys? postpone (+loop) loop] ; immediate restrict
356: : S+LOOP \ general
357: \ A symmetric version of "+LOOP". I.e., "-high -low ?DO -inc S+LOOP" will iterate as often as "high low ?DO inc S+LOOP". For positive increments it behaves like "+LOOP". Use S+LOOP instead of +LOOP for negative increments.
358: sys? postpone (s+loop) loop] ; immediate restrict
359: : NEXT sys? postpone (next) loop] ; immediate restrict
360:
361: \ Strings 22feb93py
362:
363: : ," ( "string"<"> -- ) [char] " parse
364: here over char+ allot place align ;
365: : "lit ( -- addr )
366: r> r> dup count + aligned >r swap >r ; restrict
367: : (.") "lit count type ; restrict
368: : (S") "lit count ; restrict
369: : SLiteral postpone (S") here over char+ allot place align ;
370: immediate restrict
371: : S" [char] " parse state @ IF postpone SLiteral THEN ;
372: immediate
373: : ." state @ IF postpone (.") ," align
374: ELSE [char] " parse type THEN ; immediate
375: : ( [char] ) parse 2drop ; immediate
376: : \ source >in ! drop ; immediate
377:
378: \ error handling 22feb93py
379: \ 'abort thrown out! 11may93jaw
380:
381: : (abort") "lit >r IF r> "error ! -2 throw THEN
382: rdrop ;
383: : abort" postpone (abort") ," ; immediate restrict
384:
385: \ Header states 23feb93py
386:
387: : flag! ( 8b -- ) last @ cell+ tuck c@ xor swap c! ;
388: : immediate $20 flag! ;
389: \ : restrict $40 flag! ;
390: ' noop alias restrict
391:
392: \ Header 23feb93py
393:
394: \ input-stream, nextname and noname are quite ugly (passing
395: \ information through global variables), but they are useful for dealing
396: \ with existing/independent defining words
397:
398: defer header
399:
400: : name, ( "name" -- )
401: name c@ 1+ chars allot align ;
402: : input-stream-header ( "name" -- )
403: \ !! this is f83-implementation-dependent
404: align here last ! -1 A,
405: name, $80 flag! ;
406:
407: : input-stream ( -- ) \ general
408: \ switches back to getting the name from the input stream ;
409: ['] input-stream-header IS header ;
410:
411: ' input-stream-header IS header
412:
413: \ !! make that a 2variable
414: create nextname-string 2 cells allot \ should we use a buffer that keeps the name?
415:
416: : nextname-header ( -- )
417: \ !! f83-implementation-dependent
418: nextname-string 2@
419: align here last ! -1 A,
420: dup c, here swap chars dup allot move align
421: $80 flag!
422: input-stream ;
423:
424: \ the next name is given in the string
425: : nextname ( c-addr u -- ) \ general
426: nextname-string 2!
427: ['] nextname-header IS header ;
428:
429: : noname-header ( -- )
430: 0 last !
431: input-stream ;
432:
433: : noname ( -- ) \ general
434: \ the next defined word remains anonymous. The xt of that word is given by lastxt
435: ['] noname-header IS header ;
436:
437: : lastxt ( -- xt ) \ general
438: \ xt is the execution token of the last word defined. The main purpose of this word is to get the xt of words defined using noname
439: lastcfa @ ;
440:
441: : Alias ( cfa "name" -- )
442: Header reveal , $80 flag! ;
443:
444: : name>string ( nfa -- addr count )
445: cell+ count $1F and ;
446:
447: Create ??? ," ???"
448: : >name ( cfa -- nfa )
449: $21 cell do
450: dup i - count $9F and + aligned over $80 + = if
451: i - cell - unloop exit
452: then
453: cell +loop
454: drop ??? ( wouldn't 0 be better? ) ;
455:
456: \ indirect threading 17mar93py
457:
458: : cfa, ( code-address -- )
459: here lastcfa !
460: here 0 A, 0 , code-address! ;
461: : compile, ( xt -- ) A, ;
462: : !does ( addr -- ) lastcfa @ does-code! ;
463: : (;code) ( R: addr -- ) r> /does-handler + !does ;
464: : dodoes, ( -- )
465: here /does-handler allot does-handler! ;
466:
467: \ direct threading is implementation dependent
468:
469: : Create Header reveal [ :dovar ] Literal cfa, ;
470:
471: \ DOES> 17mar93py
472:
473: : DOES> state @ IF postpone (;code) dodoes,
474: ELSE dodoes, here !does 0 ] THEN ; immediate
475:
476: \ Create Variable User Constant 17mar93py
477:
478: : Variable Create 0 , ;
479: : AVariable Create 0 A, ;
480: : 2VARIABLE ( "name" -- ) \ double
481: create 0 , 0 , ;
482:
483: : User Variable ;
484: : AUser AVariable ;
485:
486: : (Constant) Header reveal [ :docon ] Literal cfa, ;
487: : Constant (Constant) , ;
488: : AConstant (Constant) A, ;
489: : 2Constant ( w1 w2 "name" -- ) \ double
490: Create 2, DOES> 2@ ;
491:
492: \ IS Defer What's Defers TO 24feb93py
493:
494: : Defer Create ['] noop A, DOES> @ execute ;
495:
496: : IS ( addr "name" -- )
497: ' >body
498: state @
499: IF postpone ALiteral postpone !
500: ELSE !
501: THEN ; immediate
502: ' IS Alias TO immediate
503:
504: : What's ( "name" -- addr ) ' >body
505: state @ IF postpone ALiteral postpone @ ELSE @ THEN ;
506: immediate
507: : Defers ( "name" -- ) ' >body @ compile, ;
508: immediate restrict
509:
510: \ : ; 24feb93py
511:
512: : EXIT ( -- ) postpone ;s ; immediate
513:
514: : : ( -- colon-sys ) Header [ :docol ] Literal cfa, 0 ] ;
515: : ; ( colon-sys -- ) ?struc postpone exit reveal postpone [ ;
516: immediate restrict
517: : :noname ( -- xt colon-sys ) here [ :docol ] Literal cfa, 0 ] ;
518:
519: \ Search list handling 23feb93py
520:
521: AVariable current
522:
523: : last? ( -- false / nfa nfa ) last @ ?dup ;
524: : (reveal) ( -- ) last?
525: IF dup @ 0<
526: IF current @ @ over ! current @ !
527: ELSE drop THEN THEN ;
528:
529: \ object oriented search list 17mar93py
530:
531: \ Search list table: find reveal
532:
533: Create f83search ' (f83find) A, ' (reveal) A,
534: Create forth-wordlist NIL A, G f83search T A, NIL A, NIL A,
535: AVariable search G forth-wordlist search T !
536: G forth-wordlist current T !
537:
538: : (search-wordlist) ( addr count wid -- nfa / false )
539: dup @ swap cell+ @ @ execute ;
540:
541: : search-wordlist ( addr count wid -- 0 / xt +-1 )
542: (search-wordlist) dup IF found THEN ;
543:
544: Variable warnings G -1 warnings T !
545:
546: : check-shadow ( addr count wid -- )
547: \ prints a warning if the string is already present in the wordlist
548: \ !! should be refined so the user can suppress the warnings
549: >r 2dup 2dup r> (search-wordlist) warnings @ and ?dup if
550: ." redefined " name>string 2dup type
551: compare 0<> if
552: ." with " type
553: else
554: 2drop
555: then
556: space space EXIT
557: then
558: 2drop 2drop ;
559:
560: : find ( addr -- cfa +-1 / string false ) dup
561: count search @ search-wordlist dup IF rot drop THEN ;
562:
563: : reveal ( -- )
564: last? if
565: name>string current @ check-shadow
566: then
567: current @ cell+ @ cell+ @ execute ;
568:
569: : ' ( "name" -- addr ) name find 0= no.extensions ;
570: : ['] ( "name" -- addr ) ' postpone ALiteral ; immediate
571: \ Input 13feb93py
572:
573: 07 constant #bell
574: 08 constant #bs
575: 7F constant #del
576: 0D constant #cr \ the newline key code
577: 0A constant #lf
578:
579: : bell #bell emit ;
580:
581: : backspaces 0 ?DO #bs emit LOOP ;
582: : >string ( span addr pos1 -- span addr pos1 addr2 len )
583: over 3 pick 2 pick chars /string ;
584: : type-rest ( span addr pos1 -- span addr pos1 back )
585: >string tuck type ;
586: : (del) ( max span addr pos1 -- max span addr pos2 )
587: 1- >string over 1+ -rot move
588: rot 1- -rot #bs emit type-rest bl emit 1+ backspaces ;
589: : (ins) ( max span addr pos1 char -- max span addr pos2 )
590: >r >string over 1+ swap move 2dup chars + r> swap c!
591: rot 1+ -rot type-rest 1- backspaces 1+ ;
592: : ?del ( max span addr pos1 -- max span addr pos2 0 )
593: dup IF (del) THEN 0 ;
594: : (ret) type-rest drop true space ;
595: : back dup IF 1- #bs emit ELSE #bell emit THEN 0 ;
596: : forw 2 pick over <> IF 2dup + c@ emit 1+ ELSE #bell emit THEN 0 ;
597:
598: Create crtlkeys
599: ] false false back false false false forw false
600: ?del false (ret) false false (ret) false false
601: false false false false false false false false
602: false false false false false false false false [
603:
604: : decode ( max span addr pos1 key -- max span addr pos2 flag )
605: dup #del = IF drop #bs THEN \ del is rubout
606: dup bl < IF cells crtlkeys + @ execute EXIT THEN
607: >r 2over = IF rdrop bell 0 EXIT THEN
608: r> (ins) 0 ;
609:
610: \ decode should better use a table for control key actions
611: \ to define keyboard bindings later
612:
613: : accept ( addr len -- len )
614: dup 0< IF abs over dup 1 chars - c@ tuck type
615: \ this allows to edit given strings
616: ELSE 0 THEN rot over
617: BEGIN key decode UNTIL
618: 2drop nip ;
619:
620: \ Output 13feb93py
621:
622: DEFER type \ defer type for a output buffer or fast
623: \ screen write
624:
625: : (type) ( addr len -- )
626: bounds ?DO I c@ emit LOOP ;
627:
628: ' (TYPE) IS Type
629:
630: \ DEFER Emit
631:
632: \ ' (Emit) IS Emit
633:
634: \ : form ( -- rows cols ) &24 &80 ;
635: \ form should be implemented using TERMCAPS or CURSES
636: \ : rows form drop ;
637: \ : cols form nip ;
638:
639: \ Query 07apr93py
640:
641: : refill ( -- flag )
642: tib /line
643: loadfile @ ?dup
644: IF dup file-position throw linestart 2!
645: read-line throw
646: ELSE linestart @ IF 2drop false EXIT THEN
647: accept true
648: THEN
649: 1 loadline +!
650: swap #tib ! >in off ;
651:
652: : Query ( -- ) loadfile off refill drop ;
653:
654: \ File specifiers 11jun93jaw
655:
656:
657: \ 1 c, here char r c, 0 c, 0 c, 0 c, char b c, 0 c,
658: \ 2 c, here char r c, char + c, 0 c,
659: \ 2 c, here char w c, char + c, 0 c, align
660: 4 Constant w/o
661: 2 Constant r/w
662: 0 Constant r/o
663:
664: \ BIN WRITE-LINE 11jun93jaw
665:
666: \ : bin dup 1 chars - c@
667: \ r/o 4 chars + over - dup >r swap move r> ;
668:
669: : bin 1+ ;
670:
671: create nl$ 1 c, A c, 0 c, \ gnu includes usually a cr in dos
672: \ or not unix environments if
673: \ bin is not selected
674:
675: : write-line dup >r write-file ?dup IF r> drop EXIT THEN
676: nl$ count r> write-file ;
677:
678: \ include-file 07apr93py
679:
680: : include-file ( i*x fid -- j*x )
681: linestart @ >r loadline @ >r loadfile @ >r
682: blk @ >r >tib @ >r #tib @ dup >r >in @ >r
683:
684: >tib +! loadfile !
685: 0 loadline ! blk off
686: BEGIN refill WHILE interpret REPEAT
687: loadfile @ close-file throw
688:
689: r> >in ! r> #tib ! r> >tib ! r> blk !
690: r> loadfile ! r> loadline ! r> linestart ! ;
691:
692: : included ( i*x addr u -- j*x )
693: r/o open-file throw include-file ;
694:
695: \ HEX DECIMAL 2may93jaw
696:
697: : decimal a base ! ;
698: : hex 10 base ! ;
699:
700: \ DEPTH 9may93jaw
701:
702: : depth ( -- +n ) sp@ s0 @ swap - cell / ;
703:
704: \ INCLUDE 9may93jaw
705:
706: : include
707: bl word count included ;
708:
709: \ RECURSE 17may93jaw
710:
711: : recurse last @ cell+ name> a, ; immediate restrict
712: \ !! does not work with anonymous words; use lastxt compile,
713:
714: \ */MOD */ 17may93jaw
715:
716: : */mod >r m* r> sm/rem ;
717:
718: : */ */mod nip ;
719:
720: \ EVALUATE 17may93jaw
721:
722: : evaluate ( c-addr len -- )
723: linestart @ >r loadline @ >r loadfile @ >r
724: blk @ >r >tib @ >r #tib @ dup >r >in @ >r
725:
726: >tib +! dup #tib ! >tib @ swap move
727: >in off blk off loadfile off -1 linestart !
728:
729: BEGIN interpret >in @ #tib @ u>= UNTIL
730:
731: r> >in ! r> #tib ! r> >tib ! r> blk !
732: r> loadfile ! r> loadline ! r> linestart ! ;
733:
734:
735: : abort -1 throw ;
736:
737: \+ environment? true ENV" CORE"
738: \ core wordset is now complete!
739:
740: \ Quit 13feb93py
741:
742: Defer 'quit
743: Defer .status
744: : prompt state @ IF ." compiled" EXIT THEN ." ok" ;
745: : (quit) BEGIN .status cr query interpret prompt AGAIN ;
746: ' (quit) IS 'quit
747:
748: \ DOERROR (DOERROR) 13jun93jaw
749:
750: DEFER DOERROR
751:
752: : (DoError) ( throw-code -- )
753: LoadFile @ IF ." Error in line: " Loadline @ . cr THEN
754: cr source type cr
755: source drop >in @ -trailing
756: here c@ 1F min dup >r - 1- 0 max nip
757: dup spaces IF ." ^" THEN r> 0 ?DO ." -" LOOP ." ^"
758: dup -2 =
759: IF "error @ ?dup IF cr count type THEN drop
760: ELSE .error THEN ;
761:
762: ' (DoError) IS DoError
763:
764: : quit r0 @ rp! handler off >tib @ >r
765: BEGIN postpone [ ['] 'quit catch dup WHILE
766: DoError r@ >tib !
767: REPEAT drop r> >tib ! ;
768:
769: \ Cold 13feb93py
770:
771: \ : .name ( name -- ) cell+ count $1F and type space ;
772: \ : words listwords @
773: \ BEGIN @ dup WHILE dup .name REPEAT drop ;
774:
775: : >len ( cstring -- addr n ) 100 0 scan 0 swap 100 - /string ;
776: : arg ( n -- addr count ) cells argv @ + @ >len ;
777: : #! postpone \ ; immediate
778:
779: Variable env
780: Variable argv
781: Variable argc
782:
783: : get-args ( -- ) #tib off
784: argc @ 1 ?DO I arg 2dup source + swap move
785: #tib +! drop bl source + c! 1 #tib +! LOOP
786: >in off #tib @ 0<> #tib +! ;
787:
788: : script? ( -- flag ) 0 arg 1 arg dup 3 pick - /string compare 0= ;
789:
790: : cold ( -- ) argc @ 1 >
791: IF script?
792: IF 1 arg ['] included ELSE get-args ['] interpret THEN
793: catch ?dup IF dup >r DoError cr r> (bye) THEN THEN
794: ." ANS FORTH-93 (c) 1993 by the ANS FORTH-93 Team" cr quit ;
795:
796: : boot ( **env **argv argc -- )
797: argc ! argv ! env ! main-task up!
798: sp@ dup s0 ! $10 + >tib ! rp@ r0 ! fp@ f0 ! cold ;
799:
800: : bye cr 0 (bye) ;
801:
802: \ **argv may be scanned by the C starter to get some important
803: \ information, as -display and -geometry for an X client FORTH
804: \ or space and stackspace overrides
805:
806: \ 0 arg contains, however, the name of the program.
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