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
|
;;;; Copyright (C) 2000,2001 Free Software Foundation, Inc.
;;;;
;;;; This program is free software; you can redistribute it and/or modify
;;;; it under the terms of the GNU General Public License as published by
;;;; the Free Software Foundation; either version 2, or (at your option)
;;;; any later version.
;;;;
;;;; This program is distributed in the hope that it will be useful,
;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;;;; GNU General Public License for more details.
;;;;
;;;; You should have received a copy of the GNU General Public License
;;;; along with this software; see the file COPYING. If not, write to
;;;; the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
;;;; Boston, MA 02111-1307 USA
;;;;
;;;; As a special exception, the Free Software Foundation gives permission
;;;; for additional uses of the text contained in its release of GUILE.
;;;;
;;;; The exception is that, if you link the GUILE library with other files
;;;; to produce an executable, this does not by itself cause the
;;;; resulting executable to be covered by the GNU General Public License.
;;;; Your use of that executable is in no way restricted on account of
;;;; linking the GUILE library code into it.
;;;;
;;;; This exception does not however invalidate any other reasons why
;;;; the executable file might be covered by the GNU General Public License.
;;;;
;;;; This exception applies only to the code released by the
;;;; Free Software Foundation under the name GUILE. If you copy
;;;; code from other Free Software Foundation releases into a copy of
;;;; GUILE, as the General Public License permits, the exception does
;;;; not apply to the code that you add in this way. To avoid misleading
;;;; anyone as to the status of such modified files, you must delete
;;;; this exception notice from them.
;;;;
;;;; If you write modifications of your own for GUILE, it is your choice
;;;; whether to permit this exception to apply to your modifications.
;;;; If you do not wish that, delete this exception notice.
;;;;
;;; Commentary:
;; * This module exports:
;;
;; file-commentary -- a procedure that returns a file's "commentary"
;;
;; documentation-files -- a search-list of files using the Guile
;; Documentation Format Version 2.
;;
;; search-documentation-files -- a procedure that takes NAME (a symbol)
;; and searches `documentation-files' for
;; associated documentation. optional
;; arg FILES is a list of filenames to use
;; instead of `documentation-files'.
;;
;; object-documentation -- a procedure that returns its arg's docstring
;;
;; * Guile Documentation Format
;;
;; Here is the complete and authoritative documentation for the Guile
;; Documentation Format Version 2:
;;
;; HEADER
;; ^LPROC1
;; DOCUMENTATION1
;;
;; ^LPROC2
;; DOCUMENTATION2
;;
;; ^L...
;;
;; The HEADER is completely ignored. The "^L" are formfeeds. PROC1, PROC2
;; and so on are symbols that name the element documented. DOCUMENTATION1,
;; DOCUMENTATION2 and so on are the related documentation, w/o any further
;; formatting. Note that there are two newlines before the next formfeed;
;; these are discarded when the documentation is read in.
;;
;; (Version 1, corresponding to guile-1.4 and prior, is documented as being
;; not documented anywhere except by this embarrassingly circular comment.)
;;
;; * File Commentary
;;
;; A file's commentary is the body of text found between comments
;; ;;; Commentary:
;; and
;; ;;; Code:
;; both of which must be at the beginning of the line. In the result string,
;; semicolons at the beginning of each line are discarded.
;;
;; You can specify to `file-commentary' alternate begin and end strings, and
;; scrub procedure. Use #t to get default values. For example:
;;
;; (file-commentary "documentation.scm")
;; You should see this text!
;;
;; (file-commentary "documentation.scm" "^;;; Code:" "ends here$")
;; You should see the rest of this file.
;;
;; (file-commentary "documentation.scm" #t #t string-upcase)
;; You should see this text very loudly (note semicolons untouched).
;;; Code:
(define-module (ice-9 documentation)
:use-module (ice-9 rdelim)
:export (file-commentary
documentation-files search-documentation-files
object-documentation)
:autoload (ice-9 regex) (match:suffix)
:no-backtrace)
;;
;; commentary extraction
;;
(define default-in-line-re (make-regexp "^;;; Commentary:"))
(define default-after-line-re (make-regexp "^;;; Code:"))
(define default-scrub (let ((dirt (make-regexp "^;+")))
(lambda (line)
(let ((m (regexp-exec dirt line)))
(if m (match:suffix m) line)))))
(define (file-commentary filename . cust) ; (IN-LINE-RE AFTER-LINE-RE SCRUB)
;; fixme: might be cleaner to use optargs here...
(let ((in-line-re (if (> 1 (length cust))
default-in-line-re
(let ((v (car cust)))
(cond ((regexp? v) v)
((string? v) (make-regexp v))
(else default-in-line-re)))))
(after-line-re (if (> 2 (length cust))
default-after-line-re
(let ((v (cadr cust)))
(cond ((regexp? v) v)
((string? v) (make-regexp v))
(else default-after-line-re)))))
(scrub (if (> 3 (length cust))
default-scrub
(let ((v (caddr cust)))
(cond ((procedure? v) v)
(else default-scrub)))))
(port (open-input-file filename)))
(let loop ((line (read-delimited "\n" port))
(doc "")
(parse-state 'before))
(if (or (eof-object? line) (eq? 'after parse-state))
doc
(let ((new-state
(cond ((regexp-exec in-line-re line) 'in)
((regexp-exec after-line-re line) 'after)
(else parse-state))))
(if (eq? 'after new-state)
doc
(loop (read-delimited "\n" port)
(if (and (eq? 'in new-state) (eq? 'in parse-state))
(string-append doc (scrub line) "\n")
doc)
new-state)))))))
;;
;; documentation-files is the list of places to look for documentation
;;
(define documentation-files
(map (lambda (vicinity)
(in-vicinity (vicinity) "guile-procedures.txt"))
(list %library-dir
%package-data-dir
%site-dir
(lambda () "."))))
(define entry-delimiter "\f")
(define (find-documentation-in-file name file)
(and (file-exists? file)
(let ((port (open-input-file file))
(name (symbol->string name)))
(let ((len (string-length name)))
(read-delimited entry-delimiter port) ;skip to first entry
(let loop ((entry (read-delimited entry-delimiter port)))
(cond ((eof-object? entry) #f)
;; match?
((and ;; large enough?
(>= (string-length entry) len)
;; matching name?
(string=? (substring entry 0 len) name)
;; terminated?
(memq (string-ref entry len) '(#\newline)))
;; cut away name tag and extra surrounding newlines
(substring entry (+ len 2) (- (string-length entry) 2)))
(else (loop (read-delimited entry-delimiter port)))))))))
(define (search-documentation-files name . files)
(or-map (lambda (file)
(find-documentation-in-file name file))
(cond ((null? files) documentation-files)
(else files))))
;; helper until the procedure documentation property is cleaned up
(define (proc-doc proc)
(or (procedure-documentation proc)
(procedure-property proc 'documentation)))
(define (object-documentation object)
"Return the docstring for OBJECT.
OBJECT can be a procedure, macro or any object that has its
`documentation' property set."
(or (and (procedure? object)
(proc-doc object))
(and (macro? object)
(let ((transformer (macro-transformer object)))
(and transformer
(proc-doc transformer))))
(object-property object 'documentation)
(and (procedure? object)
(not (closure? object))
(procedure-name object)
(let ((docstring (search-documentation-files
(procedure-name object))))
(if docstring
(set-procedure-property! object 'documentation docstring))
docstring))))
;;; documentation.scm ends here
|