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
|
;"top-refs.scm" List Scheme code's top-level variable references.
;Copyright (C) 1995, 2003 Aubrey Jaffer
;
;Permission to copy this software, to modify it, to redistribute it,
;to distribute modified versions, 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 warranty 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.
(require 'fluid-let)
(require 'line-i/o) ; exports<-info-index uses
(require 'string-case) ; exports<-info-index uses
(require 'string-search) ; exports<-info-index uses
(require 'manifest) ; load->path
;;@code{(require 'top-refs)}
;;@ftindex top-refs
;;@cindex top-level variable references
;;@cindex variable references
;;
;;@noindent
;;These procedures complement those in @ref{Module Manifests} by
;;finding the top-level variable references in Scheme source code.
;;They work by traversing expressions and definitions, keeping track
;;of bindings encountered. It is certainly possible to foil these
;;functions, but they return useful information about SLIB source
;;code.
(define *references* '())
(define *bindings* '())
(define (top-refs:warn proc msg . more)
(for-each display (list "WARN:" proc ": " msg " "))
(for-each (lambda (x) (write x) (display #\ ))
more)
(newline))
;;@body
;;Returns a list of the top-level variables referenced by the Scheme
;;expression @1.
(define (top-refs obj)
(fluid-let ((*references* '()))
(if (string? obj)
(top-refs:include obj)
(top-refs:top-level obj))
*references*))
;;@body
;;@1 should be a string naming an existing file containing Scheme
;;source code. @0 returns a list of the top-level variable references
;;made by expressions in the file named by @1.
;;
;;Code in modules which @1 @code{require}s is not traversed. Code in
;;files loaded from top-level @emph{is} traversed if the expression
;;argument to @code{load}, @code{slib:load}, @code{slib:load-source},
;;@code{macro:load}, @code{defmacro:load}, @code{synclo:load},
;;@code{syncase:load}, or @code{macwork:load} is a literal string
;;constant or composed of combinations of vicinity functions and
;;string literal constants; and the resulting file exists (possibly
;;with ".scm" appended).
(define (top-refs<-file filename)
(fluid-let ((*references* '()))
(top-refs:include filename)
*references*))
(define (top-refs:include filename)
(cond ((not (and (string? filename) (file-exists? filename)))
(top-refs:warn 'top-refs:include 'skipping filename))
(else (call-with-input-file filename
(lambda (port)
(with-load-pathname filename
(lambda ()
(do ((exp (read port) (read port)))
((eof-object? exp))
(top-refs:top-level exp)))))))))
(define (top-refs:top-level exp)
(cond ((not (and (pair? exp) (list? exp)))
(top-refs:warn 'top-refs "non-list at top level?" exp))
((not (symbol? (car exp))) (top-refs:expression exp))
(else
(case (car exp)
((begin) (for-each top-refs:top-level (cdr exp)))
((cond) (for-each (lambda (clause)
(for-each top-refs:top-level clause))
(cdr exp)))
((if) (for-each top-refs:top-level
(if (list? (cadr exp)) (cdr exp) (cddr exp))))
((define define-operation)
;;(display "; walking ") (write (cadr exp)) (newline)
(top-refs:binding (cadr exp) (cddr exp)))
((define-syntax)
(top-refs:binding (cadr exp) (cddr exp)))
((defmacro)
;;(display "; malking ") (write (cadr exp)) (newline)
(if (pair? (cadr exp))
(top-refs:binding (cdadr exp) (cddr exp))
(top-refs:binding (caddr exp) (cdddr exp))))
((load slib:load slib:load-source macro:load defmacro:load
syncase:load synclo:load macwork:load)
(top-refs:include (load->path (cadr exp))))
;;((require) (top-refs:require ''compiling (cadr exp)))
;;((require-if) (top-refs:require (cadr exp) (caddr exp)))
(else (top-refs:expression exp))))))
(define (arglist:flatten b)
(cond ((symbol? b) (list b))
((pair? b)
(if (pair? (car b))
(append (arglist:flatten (car b)) (arglist:flatten (cdr b)))
(cons (car b) (arglist:flatten (cdr b)))))
((list? b) b)
(else (slib:error 'arglist:flatten 'bad b))))
(define (top-refs:binding binding body)
(fluid-let ((*bindings* (append (arglist:flatten binding)
*bindings*)))
(for-each (lambda (exp)
(cond ((and (pair? exp) (eq? 'define (car exp)))
(set! *bindings* (cons (if (symbol? (cadr exp))
(cadr exp)
(caadr exp))
*bindings*)))))
body)
(for-each top-refs:expression body)))
(define (top-refs:expression exp)
(define (cwq exp)
(cond ((vector? exp) (for-each cwq (vector->list exp)))
((not (pair? exp)))
((not (list? exp)) (top-refs:warn " dotted list? " exp))
((memq (car exp) '(unquote unquote-splicing))
(top-refs:expression (cadr exp)))
(else (for-each cwq exp))))
(define (cwe exp)
(cond ((symbol? exp)
(if (and (not (memq exp *bindings*))
(not (memq exp *references*)))
(set! *references* (cons exp *references*))))
((not (pair? exp)))
((not (list? exp))
(for-each top-refs:expression (arglist:flatten exp)))
((not (symbol? (car exp))) (for-each top-refs:expression exp))
(else
(case (car exp)
((quote) #f)
((quasiquote) (cwq (cadr exp)))
((begin) (for-each cwe (cdr exp)))
((define)
(cond ((pair? (cadr exp)) ; (define (foo ...) ...)
(top-refs:binding (cadr exp) (cddr exp)))
(else
(top-refs:binding (cadr exp) (list (cddr exp))))))
((lambda) (top-refs:binding (cadr exp) (cddr exp)))
((case)
(top-refs:expression (cadr exp))
(for-each (lambda (exp)
(for-each top-refs:expression (cdr exp)))
(cddr exp)))
((cond)
(for-each (lambda (exp)
(for-each top-refs:expression exp))
(cdr exp)))
((let)
(cond ((symbol? (cadr exp))
(for-each top-refs:expression (map cadr (caddr exp)))
(top-refs:binding (cons (cadr exp) (map car (caddr exp)))
(cdddr exp)))
(else
(for-each top-refs:expression (map cadr (cadr exp)))
(top-refs:binding (map car (cadr exp)) (cddr exp)))))
((letrec with-syntax)
(top-refs:binding
(map car (cadr exp)) (append (map cadr (cadr exp)) (cddr exp))))
((let*)
(cond ((null? (cadr exp))
(top-refs:binding '() (cddr exp)))
((pair? (caadr exp))
(top-refs:expression (cadr (caadr exp)))
(top-refs:binding (caaadr exp)
`((let* ,(cdadr exp) ,@(cddr exp)))))
(else
(top-refs:binding (list (caadr exp))
`((let* ,(cdadr exp) ,@(cddr exp)))))))
((do)
(for-each top-refs:expression (map cadr (cadr exp)))
(top-refs:binding
(map car (cadr exp))
(append
(map (lambda (binding)
(case (length binding)
((2) (car binding))
((3) (caddr binding))
(else (top-refs:warn
'top-refs:expression 'bad 'do-binding exp))))
(cadr exp))
(caddr exp)
(cddr exp))))
((syntax-rules)
(fluid-let ((*bindings* (append (arglist:flatten (cadr exp))
*bindings*)))
(for-each (lambda (exp)
(top-refs:binding (car exp) (cdr exp)))
(cddr exp))))
((syntax-case)
(fluid-let ((*bindings*
(cons (cadr exp)
(append (arglist:flatten (caddr exp))
*bindings*))))
(for-each (lambda (exp)
(top-refs:binding (car exp) (cdr exp)))
(cdddr exp))))
(else (for-each top-refs:expression exp))))))
(cwe exp))
;;@noindent
;;The following function parses an @dfn{Info} Index.
;;@footnote{Although it will
;;work on large info files, feeding it an excerpt is much faster; and
;;has less chance of being confused by unusual text in the info file.
;;This command excerpts the SLIB index into @file{slib-index.info}:
;;
;;@example
;;info -f slib2d6.info -n "Index" -o slib-index.info
;;@end example
;;}
;;@body
;;@2 @dots{} must be an increasing series of positive integers.
;;@0 returns a list of all the identifiers appearing in the @var{n}th
;;@dots{} (info) indexes of @1. The identifiers have the case that
;;the implementation's @code{read} uses for symbols. Identifiers
;;containing spaces (eg. @code{close-base on base-table}) are
;;@emph{not} included. #f is returned if the index is not found.
;;
;;Each info index is headed by a @samp{* Menu:} line. To list the
;;symbols in the first and third info indexes do:
;;
;;@example
;;(exports<-info-index "slib.info" 1 3)
;;@end example
(define (exports<-info-index file . n)
(call-with-input-file file
(lambda (port)
(define exports '())
(and
(find-string-from-port? " Node: Index," port)
(let loop ((line (read-line port))
(iidx 1)
(ndxs n))
(cond ((null? ndxs) (reverse exports))
((eof-object? line) #f)
((not (string-ci=? "* Menu:" line))
(loop (read-line port) iidx ndxs))
((>= iidx (car ndxs))
(let ((blank (read-line port)))
(if (not (equal? "" blank))
(slib:error 'funny 'blank blank)))
(do ((line (read-line port) (read-line port)))
((or (eof-object? line)
(not (and (> (string-length line) 5)
(or (string=? "* " (substring line 0 2))
(substring? "(line " line)))))
(loop (read-line port) (+ 1 iidx) (cdr ndxs)))
(and
(string=? "* " (substring line 0 2))
(let ((<n> (substring? " <" line)))
(define csi (or (and <n>
(> (string-length line) (+ 3 <n>))
(string-index
"0123456789"
(string-ref line (+ 2 <n>)))
<n>)
(substring? ": " line)))
(and
csi
(let ((str (substring line 2 csi)))
(if (and (not (substring? " " str))
(not (memq (string-ci->symbol str) exports)))
(set! exports (cons (string-ci->symbol str) exports)))))))))
(else (loop (read-line port) (+ 1 iidx) ndxs))))))))
|