summaryrefslogtreecommitdiffstats
path: root/require.scm
blob: ebaf49fe1bc3dd2a520c9a966ebd73f3520f5028 (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
;;;; Implementation of VICINITY and MODULES for Scheme
;Copyright (C) 1991, 1992, 1993, 1994, 1997 Aubrey Jaffer
;
;Permission to copy this software, to redistribute it, and to use it
;for any purpose is granted, subject to the following restrictions and
;understandings.
;
;1.  Any copy made of this software must include this copyright notice
;in full.
;
;2.  I have made no warrantee or representation that the operation of
;this software will be error-free, and I am under no obligation to
;provide any services, by way of maintenance, update, or otherwise.
;
;3.  In conjunction with products arising from the use of this
;material, there shall be no use of my name in any advertising,
;promotional, or sales literature without prior written consent in
;each case.

(define *SLIB-VERSION* "2c3")

;;; Standardize msdos -> ms-dos.
(define software-type
  (cond ((eq? 'msdos (software-type))
	 (lambda () 'ms-dos))
	(else software-type)))

(define (user-vicinity)
  (case (software-type)
    ((VMS)	"[.]")
    (else	"")))

(define *load-pathname* #f)
(define program-vicinity
  (let ((*vicinity-suffix*
	 (case (software-type)
	   ((AMIGA)	'(#\: #\/))
	   ((MS-DOS WINDOWS ATARIST OS/2)	'(#\\ #\/))
	   ((MACOS THINKC)	'(#\:))
	   ((NOSVE)	'(#\: #\.))
	   ((UNIX COHERENT)	'(#\/))
	   ((VMS)	'(#\: #\])))))
    (lambda ()
      (if *load-pathname*
	  (let loop ((i (- (string-length *load-pathname*) 1)))
	    (cond ((negative? i) "")
		  ((memv (string-ref *load-pathname* i) *vicinity-suffix*)
		   (substring *load-pathname* 0 (+ i 1)))
		  (else (loop (- i 1)))))
	  (slib:error "Not loading but called" 'program-vicinity)))))

(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) ".")
	      ((UNIX COHERENT AMIGA) "/")
	      ((MACOS THINKC) ":")
	      ((MS-DOS WINDOWS ATARIST OS/2) "\\"))))
       (lambda (vic name)
	 (string-append vic name *vicinity-suffix*))))))

(define (make-vicinity <pathname>) <pathname>)

(define (slib:pathnameize-load *old-load*)
  (lambda (<pathname> . extra)
    (let ((old-load-pathname *load-pathname*))
      (set! *load-pathname* <pathname>)
      (apply *old-load* (cons <pathname> extra))
      (require:provide <pathname>)
      (set! *load-pathname* old-load-pathname))))

(set! slib:load-source
      (slib:pathnameize-load slib:load-source))
(set! slib:load
      (slib:pathnameize-load slib:load))

;;;; MODULES

(define *catalog* #f)
(define *modules* '())

(define (require:version path)
  (let ((expr (and (file-exists? path)
		   (call-with-input-file path (lambda (port) (read port))))))
    (and (list? expr) (= 3 (length expr))
	 (eq? (car expr) 'define) (eq? (cadr expr) '*SLIB-VERSION*)
	 (string? (caddr expr)) (caddr expr))))

(define (catalog/require-version-match? slibcat)
  (let* ((apair (assq '*SLIB-VERSION* slibcat))
	 (req (in-vicinity (library-vicinity)
			   (string-append "require" (scheme-file-suffix))))
	 (reqvers (require:version req)))
    (cond ((not (file-exists? req))
	   (slib:warn "can't find " req) #f)
	  ((not apair) #f)
	  ((not (equal? reqvers (cdr apair))) #f)
	  ((not (equal? reqvers *SLIB-VERSION*))
	   (slib:warn "The loaded " req " is stale.")
	   #t)
	  (else #t))))

(define (catalog:try-read vicinity name)
  (or (and vicinity name
	   (let ((path (in-vicinity vicinity name)))
	     (and (file-exists? path)
		  (call-with-input-file path
		    (lambda (port)
		      (do ((expr (read port) (read port))
			   (lst '() (cons expr lst)))
			  ((eof-object? expr)
			   (apply append lst))))))))
      '()))

(define (catalog:get feature)
  (if (not *catalog*)
      (let ((slibcat (catalog:try-read (implementation-vicinity) "slibcat")))
	(cond ((not (catalog/require-version-match? slibcat))
	       (slib:load (in-vicinity (library-vicinity) "mklibcat"))
	       (set! slibcat
		     (catalog:try-read (implementation-vicinity) "slibcat"))))
	(cond (slibcat
	       (set! *catalog* ((slib:eval
				 (cadr (or (assq 'catalog:filter slibcat)
					   '(#f identity))))
				slibcat))))
	(set! *catalog*
	      (append (catalog:try-read (home-vicinity) "homecat") *catalog*))
	(set! *catalog*
	      (append (catalog:try-read (user-vicinity) "usercat") *catalog*))))
  (and feature *catalog* (cdr (or (assq feature *catalog*) '(#f . #f)))))

(define (require:provided? feature)
  (if (symbol? feature)
      (if (memq feature *features*) #t
	  (let ((path (catalog:get feature)))
	    (cond ((symbol? path) (require:provided? path))
		  ((member (if (pair? path) (cdr path) path) *modules*)
		   #t)
		  (else #f))))
      (and (member feature *modules*) #t)))

(define (require:feature->path feature)
  (and (symbol? feature)
       (let ((path (catalog:get feature)))
	 (if (symbol? path) (require:feature->path path) path))))

(define (require:require feature)
  (or (require:provided? feature)
      (let ((path (catalog:get feature)))
	(cond ((and (not path) (string? feature) (file-exists? feature))
	       (set! path feature)))
	(cond ((not feature) (set! *catalog* #f))
	      ((not path)
	       (slib:error ";required feature not supported: " feature))
	      ((symbol? path) (require:require path) (require:provide feature))
	      ((not (pair? path))	;simple name
	       (slib:load path)
	       (and (not (eq? 'new-catalog feature)) (require:provide feature)))
	      (else			;special loads
	       (require:require (car path))
	       (apply (case (car path)
			((macro) macro:load)
			((syntactic-closures) synclo:load)
			((syntax-case) syncase:load)
			((macros-that-work) macwork:load)
			((macro-by-example) defmacro:load)
			((defmacro) defmacro:load)
			((source) slib:load-source)
			((compiled) slib:load-compiled)
			(else (slib:error "unknown package loader" path)))
		      (if (list? path) (cdr path) (list (cdr path))))
	       (require:provide feature))))))

(define (require:provide feature)
  (if (symbol? feature)
      (if (not (memq feature *features*))
	  (set! *features* (cons feature *features*)))
      (if (not (member feature *modules*))
	  (set! *modules* (cons feature *modules*)))))

(require:provide 'vicinity)

(define provide require:provide)
(define provided? require:provided?)
(define require require:require)

(if (and (string->number "0.0") (inexact? (string->number "0.0")))
    (require:provide 'inexact))
(if (rational? (string->number "1/19")) (require:provide 'rational))
(if (real? (string->number "0.0")) (require:provide 'real))
(if (complex? (string->number "1+i")) (require:provide 'complex))
(let ((n (string->number "9999999999999999999999999999999")))
  (if (and n (exact? n)) (require:provide 'bignum)))

(define report:print
  (lambda args
    (for-each (lambda (x) (write x) (display #\ )) args)
    (newline)))

(define slib:report
  (let ((slib:report (lambda () (slib:report-version) (slib:report-locations))))
    (lambda args
      (cond ((null? args) (slib:report))
	    ((not (string? (car args)))
	     (slib:report-version) (slib:report-locations #t))
	    ((require:provided? 'transcript)
	     (transcript-on (car args))
	     (slib:report)
	     (transcript-off))
	    ((require:provided? 'with-file)
	     (with-output-to-file (car args) slib:report))
	    (else (slib:report))))))

(define slib:report-version
  (lambda ()
    (report:print
     'SLIB *SLIB-VERSION* 'on (scheme-implementation-type)
     (scheme-implementation-version) 'on (software-type))))

(define slib:report-locations
  (let ((features *features*))
    (lambda args
      (report:print '(IMPLEMENTATION-VICINITY) 'is (implementation-vicinity))
      (report:print '(LIBRARY-VICINITY) 'is (library-vicinity))
      (report:print '(SCHEME-FILE-SUFFIX) 'is (scheme-file-suffix))
      (cond (*load-pathname*
	     (report:print '*LOAD-PATHNAME* 'is *load-pathname*)))
      (cond ((not (null? *modules*))
	     (report:print 'Loaded '*MODULES* 'are: *modules*)))
      (let* ((i (+ -1 5)))
	(cond ((eq? (car features) (car *features*)))
	      (else (report:print 'loaded '*FEATURES* ':) (display slib:tab)))
	(for-each
	 (lambda (x)
	   (cond ((eq? (car features) x)
		  (if (not (eq? (car features) (car *features*))) (newline))
		  (report:print 'Implementation '*FEATURES* ':)
		  (display slib:tab) (set! i (+ -1 5)))
		 ((zero? i) (newline) (display slib:tab) (set! i (+ -1 5)))
		 ((not (= (+ -1 5) i)) (display #\ )))
	   (write x) (set! i (+ -1 i)))
	 *features*))
      (newline)
      (report:print 'Implementation '*CATALOG* ':)
      (catalog:get #f)
      (cond ((pair? args)
	     (for-each (lambda (x) (display slib:tab) (report:print x))
		       *catalog*))
	    (else (display slib:tab) (report:print (car *catalog*))
		  (display slib:tab) (report:print '...)))
      (newline))))

(let ((sit (scheme-implementation-version)))
  (cond ((zero? (string-length sit)))
	((or (not (string? sit)) (char=? #\? (string-ref sit 0)))
	 (newline)
	 (slib:report-version)
	 (report:print 'edit (scheme-implementation-type) ".init"
		       'to 'set '(scheme-implementation-version) 'string)
	 (report:print '(IMPLEMENTATION-VICINITY) 'is (implementation-vicinity))
	 (report:print 'type '(slib:report) 'for 'configuration)
	 (newline))))