summaryrefslogtreecommitdiffstats
path: root/scheme48.init
blob: 2b14f309b8aadeaab1b0eb4bd2f635c0564c3319 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
;;;"scheme48.init" Initialisation for SLIB for Scheme48	-*-scheme-*-
;;; Author: Aubrey Jaffer
;;;
;;; This code is in the public domain.

,batch on
,load-package floatnums
,config
,load =scheme48/misc/packages.scm
(define-structure slib-primitives
  (export s48-modulo s48-atan s48-char->integer
	  s48-getenv s48-current-time s48-time-seconds
	  s48-system
	  s48-current-error-port
	  s48-force-output
	  s48-with-handler
	  s48-ascii->char
	  s48-error s48-warn
	  s48-make-string-input-port
	  s48-make-string-output-port
	  s48-string-output-port-output
	  s48-exit)
  (open (modify scheme
                (rename (modulo s48-modulo) (atan s48-atan)
			(char->integer s48-char->integer)))
	; primitives
	(modify posix
		(rename (current-time s48-current-time)
			(time-seconds s48-time-seconds)
			(lookup-environment-variable s48-getenv)))
	(modify c-system-function (rename (system s48-system)))
	(modify i/o
		(rename (current-error-port s48-current-error-port)
			(force-output s48-force-output)))
	(modify handle (rename (with-handler s48-with-handler)))
	(modify ascii  (rename (ascii->char s48-ascii->char)))
	(modify signals (rename (error s48-error) (warn s48-warn)))
	(modify root-scheduler (rename (scheme-exit-now s48-exit)))
	(modify extended-ports
		(rename (make-string-input-port
			 s48-make-string-input-port)
			(make-string-output-port
			 s48-make-string-output-port)
			(string-output-port-output
			 s48-string-output-port-output))))
  (begin #t))
,user
,open slib-primitives

(define getenv s48-getenv)
(define system s48-system)

;;; (software-type) should be set to the generic operating system type.
;;; UNIX, VMS, MACOS, AMIGA and MS-DOS are supported.
(define (software-type) 'unix)

;;; (scheme-implementation-type) should return the name of the scheme
;;; implementation loading this file.
(define (scheme-implementation-type) 'Scheme48)

;;; (scheme-implementation-home-page) should return a (string) URI
;;; (Uniform Resource Identifier) for this scheme implementation's home
;;; page; or false if there isn't one.
(define (scheme-implementation-home-page) "http://s48.org/")

;;; (scheme-implementation-version) should return a string describing
;;; the version of the scheme implementation loading this file.
(define scheme-implementation-version
  (let ((version (getenv "S48_VERSION")))
    (lambda () version)))

;;; (implementation-vicinity) should be defined to be the pathname of
;;; the directory where any auxiliary files to your Scheme
;;; implementation reside.
(define implementation-vicinity
  (let ((vic (getenv "S48_VICINITY")))
    (lambda () vic)))

;;; (library-vicinity) should be defined to be the pathname of the
;;; directory where files of Scheme library functions reside.
(define library-vicinity
  (let ((vic (getenv "SCHEME_LIBRARY_PATH")))
    (lambda () vic)))

;;; (home-vicinity) should return the vicinity of the user's HOME
;;; directory, the directory which typically contains files which
;;; customize a computer environment for a user.
;;;
;;; Ivan Shmakov points out that evaluating (getenv "HOME") when
;;; compiling captures the installer's home directory.  So delay until
;;; HOME-VICINITY is called.
(define (home-vicinity)
  (let ((home (getenv "HOME")))
    (and home
	 (if (eqv? #\/ (string-ref home (+ -1 (string-length home))))
	     home
	     (string-append home "/")))))
;@
(define in-vicinity string-append)
;@
(define (user-vicinity)
  (case (software-type)
    ((vms)	"[.]")
    (else	"")))

(define *load-pathname* #f)
;@
(define vicinity:suffix?
  (let ((suffi
	 (case (software-type)
	   ((amiga)				'(#\: #\/))
	   ((macos thinkc)			'(#\:))
	   ((ms-dos windows atarist os/2)	'(#\\ #\/))
	   ((nosve)				'(#\: #\.))
	   ((unix coherent plan9)		'(#\/))
	   ((vms)				'(#\: #\]))
	   (else
	    (slib:warn "require.scm" 'unknown 'software-type (software-type))
	    "/"))))
    (lambda (chr) (and (memv chr suffi) #t))))
;@
(define (pathname->vicinity pathname)
  (let loop ((i (- (string-length pathname) 1)))
    (cond ((negative? i) "")
	  ((vicinity:suffix? (string-ref pathname i))
	   (substring pathname 0 (+ i 1)))
	  (else (loop (- i 1))))))
(define (program-vicinity)
  (if *load-pathname*
      (pathname->vicinity *load-pathname*)
      (slib:error 'program-vicinity " called; use slib:load to load")))
;@
(define sub-vicinity
  (case (software-type)
    ((vms) (lambda
	       (vic name)
	     (let ((l (string-length vic)))
	       (if (or (zero? (string-length vic))
		       (not (char=? #\] (string-ref vic (- l 1)))))
		   (string-append vic "[" name "]")
		   (string-append (substring vic 0 (- l 1))
				  "." name "]")))))
    (else (let ((*vicinity-suffix*
		 (case (software-type)
		   ((nosve) ".")
		   ((macos thinkc) ":")
		   ((ms-dos windows atarist os/2) "\\")
		   ((unix coherent plan9 amiga) "/"))))
	    (lambda (vic name)
	      (string-append vic name *vicinity-suffix*))))))
;@
(define (make-vicinity <pathname>) <pathname>)
;@
(define with-load-pathname
  (let ((exchange
	 (lambda (new)
	   (let ((old *load-pathname*))
	     (set! *load-pathname* new)
	     old))))
    (lambda (path thunk)
      (let ((old #f))
	(dynamic-wind
	    (lambda () (set! old (exchange path)))
	    thunk
	    (lambda () (exchange old)))))))

;;@ *FEATURES* is a list of symbols naming the (SLIB) features
;;; initially supported by this implementation.
(define *features*
      '(
	source				;can load scheme source files
					;(SLIB:LOAD-SOURCE "filename")
;;;	compiled			;can load compiled files
					;(SLIB:LOAD-COMPILED "filename")
	vicinity
	srfi-59

		       ;; Scheme report features
   ;; R5RS-compliant implementations should provide all 9 features.

	r5rs				;conforms to
	eval				;R5RS two-argument eval
	values				;R5RS multiple values
	dynamic-wind			;R5RS dynamic-wind
	macro				;R5RS high level macros
	delay				;has DELAY and FORCE
	multiarg-apply			;APPLY can take more than 2 args.
	char-ready?
	rev4-optional-procedures	;LIST-TAIL, STRING-COPY,
					;STRING-FILL!, and VECTOR-FILL!

      ;; These four features are optional in both R4RS and R5RS

;;;	multiarg/and-			;/ and - can take more than 2 args.
	rationalize
;;;	transcript			;TRANSCRIPT-ON and TRANSCRIPT-OFF
	with-file			;has WITH-INPUT-FROM-FILE and
					;WITH-OUTPUT-TO-FILE

	r4rs				;conforms to

	ieee-p1178			;conforms to

;;;	r3rs				;conforms to

;;;	rev2-procedures			;SUBSTRING-MOVE-LEFT!,
					;SUBSTRING-MOVE-RIGHT!,
					;SUBSTRING-FILL!,
					;STRING-NULL?, APPEND!, 1+,
					;-1+, <?, <=?, =?, >?, >=?
;;;	object-hash			;has OBJECT-HASH

	full-continuation		;can return multiple times
;;;	ieee-floating-point		;conforms to IEEE Standard 754-1985
					;IEEE Standard for Binary
					;Floating-Point Arithmetic.

			;; Other common features

;;;	srfi				;srfi-0, COND-EXPAND finds all srfi-*
;;;	sicp				;runs code from Structure and
					;Interpretation of Computer
					;Programs by Abelson and Sussman.
	defmacro			;has Common Lisp DEFMACRO
;;;	record				;has user defined data structures
	string-port			;has CALL-WITH-INPUT-STRING and
					;CALL-WITH-OUTPUT-STRING
;;;	sort
;;;	pretty-print
;;;	object->string
;;;	format				;Common-lisp output formatting
;;;	trace				;has macros: TRACE and UNTRACE
;;;	compiler			;has (COMPILER)
;;;	ed				;(ED) is editor
	system				;posix (system <string>)
	getenv				;posix (getenv <string>)
;;;	program-arguments		;returns list of strings (argv)
	current-time			;returns time in seconds since 1/1/1970

		  ;; Implementation Specific features

	))

;;; (OUTPUT-PORT-WIDTH <port>)
(define (output-port-width . arg) 79)

;;; (OUTPUT-PORT-HEIGHT <port>)
(define (output-port-height . arg) 24)

;;; (CURRENT-ERROR-PORT)
(define current-error-port s48-current-error-port)

;;; (TMPNAM) makes a temporary file name.
(define tmpnam
  (let ((cntr 100))
    (lambda () (set! cntr (+ 1 cntr))
	    (let ((tmp (string-append "slib_" (number->string cntr))))
	      (if (file-exists? tmp) (tmpnam) tmp)))))

;;; (FILE-EXISTS? <string>)
(define (file-exists? f)
  (call-with-current-continuation
   (lambda (k)
     (s48-with-handler
      (lambda (condition decline)
	(k #f))
      (lambda ()
	(close-input-port (open-input-file f))
	#t)))))

;;; (DELETE-FILE <string>)
(define (delete-file file-name)
  (system (string-append "rm " file-name)))

;;; FORCE-OUTPUT flushes any pending output on optional arg output port
;;; use this definition if your system doesn't have such a procedure.
(define (force-output . arg)
  (s48-force-output
   (if (null? arg) (current-output-port) (car arg))))

(define (make-exchanger obj)
  (lambda (rep) (let ((old obj)) (set! obj rep) old)))

;@
(define (open-file filename modes)
  (call-with-current-continuation
   (lambda (k)
     (s48-with-handler
      (lambda (condition decline)
        (k #f))
      (case modes
        ((r rb) (lambda () (open-input-file  filename)))
        ((w wb) (lambda () (open-output-file filename)))
        (else (slib:error 'open-file 'mode? modes)))))))

(define (port? obj) (or (input-port? port) (output-port? port)))
(define (call-with-open-ports . ports)
  (define proc (car ports))
  (cond ((procedure? proc) (set! ports (cdr ports)))
	(else (set! ports (reverse ports))
	      (set! proc (car ports))
	      (set! ports (reverse (cdr ports)))))
  (let ((ans (apply proc ports)))
    (for-each close-port ports)
    ans))
(define (close-port port)
  (cond ((input-port? port)
	 (close-input-port port)
	 (if (output-port? port) (close-output-port port)))
	((output-port? port) (close-output-port port))
	(else (slib:error 'close-port 'port? port))))

(define (browse-url url)
  (define (try cmd) (eqv? 0 (system (sprintf #f cmd url))))
  (or (try "netscape-remote -remote 'openURL(%s)'")
      (try "netscape -remote 'openURL(%s)'")
      (try "netscape '%s'&")
      (try "netscape '%s'")))

;;; "rationalize" adjunct procedures.
(define (find-ratio x e)
  (let ((rat (rationalize x e)))
    (list (numerator rat) (denominator rat))))
(define (find-ratio-between x y)
  (find-ratio (/ (+ x y) 2) (/ (- x y) 2)))

;;; CHAR-CODE-LIMIT is one greater than the largest integer which can
;;; be returned by CHAR->INTEGER.
(define char-code-limit 256)
(define integer->char s48-ascii->char)
(define char->integer
  (let ((code0 (s48-char->integer (integer->char 0))))
    (lambda (char) (- (s48-char->integer char) code0))))

;;; MOST-POSITIVE-FIXNUM is used in modular.scm
(define most-positive-fixnum #x1FFFFFFF)

;;; Return argument
(define identity values)

;;; SLIB:EVAL is single argument eval using the top-level (user) environment.
(define slib:eval
  (let ((eval eval)
	(interaction-environment interaction-environment))
    (lambda (form)
      (eval form (interaction-environment)))))

;;; If your implementation provides R4RS macros:
(define macro:eval slib:eval)
(define (macro:load <pathname>)
  (if (not (file-exists? <pathname>))
      (set! <pathname> (string-append <pathname> (scheme-file-suffix))))
  (load <pathname>))

(define *defmacros*
  (list (cons 'defmacro
	      (lambda (name parms . body)
		`(set! *defmacros* (cons (cons ',name (lambda ,parms ,@body))
					 *defmacros*))))))
(define (defmacro? m) (and (assq m *defmacros*) #t))

(define (macroexpand-1 e)
  (if (pair? e)
      (let ((a (car e)))
	(cond ((symbol? a) (set! a (assq a *defmacros*))
	       (if a (apply (cdr a) (cdr e)) e))
	      (else e)))
      e))

(define (macroexpand e)
  (if (pair? e)
      (let ((a (car e)))
	(cond ((symbol? a)
	       (set! a (assq a *defmacros*))
	       (if a (macroexpand (apply (cdr a) (cdr e))) e))
	      (else e)))
      e))

(define gentemp
  (let ((*gensym-counter* -1))
    (lambda ()
      (set! *gensym-counter* (+ *gensym-counter* 1))
      (string->symbol
       (string-append "slib:G" (number->string *gensym-counter*))))))

(define base:eval slib:eval)
(define (defmacro:eval x) (base:eval (defmacro:expand* x)))

(define defmacro:load macro:load)
;; slib:eval-load definition moved to "require.scm"

(define (slib:warn . args)
  ;;(if (provided? 'trace) (print-call-stack cep))
  (apply s48-warn args))

;;; define an error procedure for the library
(define (slib:error . args)
  ;;(if (provided? 'trace) (print-call-stack (current-error-port)))
  (apply s48-error args))

;;; define these as appropriate for your system.
(define slib:tab (s48-ascii->char 9))
(define slib:form-feed (s48-ascii->char 12))

;;; Support for older versions of Scheme.  Not enough code for its own file.
(define (last-pair l) (if (pair? (cdr l)) (last-pair (cdr l)) l))
(define t #t)
(define nil #f)

;;; Define these if your implementation's syntax can support them and if
;;; they are not already defined.

(define (1+ n) (+ n 1))
(define (-1+ n) (+ n -1))
;(define 1- -1+)

;;; Define SLIB:EXIT to be the implementation procedure to exit or
;;; return if exiting not supported.
(define (slib:exit . opt)
  (s48-exit (if (pair? opt) (car opt) 0)))

;;; Here for backward compatability
(define scheme-file-suffix
  (case (software-type)
    ((nosve) (lambda () "_scm"))
    (else (lambda () ".scm"))))

;;; (SLIB:LOAD-SOURCE "foo") should load "foo.scm" or with whatever
;;; suffix all the module files in SLIB have.  See feature 'SOURCE.
(define (slib:load-source f) (load (string-append f (scheme-file-suffix))))

;;; (SLIB:LOAD-COMPILED "foo") should load the file that was produced
;;; by compiling "foo.scm" if this implementation can compile files.
;;; See feature 'COMPILED.
(define slib:load-compiled load)

;;; At this point SLIB:LOAD must be able to load SLIB files.
(define slib:load slib:load-source)

;;; Scheme48 complains that these are not defined (even though they
;;; won't be called until they are).
(define synclo:load #f)
(define syncase:load #f)
(define macwork:load #f)
(define transcript-on #f)
(define transcript-off #f)

;;; Jacques Mequin wins the Spring 2001 SLIB extreme cleverness award:
(define-syntax defmacro
  (lambda (e r c)
    (let* ((e-fields (cdr e))
	   (macro-name (car e-fields))
	   (macro-args (cdr e-fields))
	   (slib-store (eval 'defmacro:eval (interaction-environment))))
      (slib-store `(defmacro ,macro-name ,@macro-args)))
    `(define-syntax ,(cadr e)
       (lambda (em rm cm)
	 (let ((macro-name ',(cadr e))
	       (macro-args (cdr em))
	       (slib-eval (eval 'macroexpand-1 (interaction-environment))))
	   (slib-eval `(,macro-name ,@macro-args)))))))

(slib:load (in-vicinity (library-vicinity) "require"))

;;; Needed to support defmacro
(require 'defmacroexpand)
(define *args* '())
(define (program-arguments) (cons "scheme48" *args*))

;@
(define (call-with-output-string proc)
  (let ((port (s48-make-string-output-port)))
    (proc port)
    (s48-string-output-port-output port)))
(define (call-with-input-string string proc)
  (proc (s48-make-string-input-port string)))

;@
(define (current-time)
  (s48-time-seconds (s48-current-time)))
(define (difftime caltime1 caltime0)
  (- caltime1 caltime0))
(define (offset-time caltime offset)
  (+ caltime offset))

(require #f)

,collect
,batch off
,dump slib.image "(slib 3a2)"
,exit