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
|
;;;; regex.scm
;
; Copyright (c) 2008-2010, The Chicken Team
; Copyright (c) 2000-2007, Felix L. Winkelmann
; All rights reserved.
;
; Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following
; conditions are met:
;
; Redistributions of source code must retain the above copyright notice, this list of conditions and the following
; disclaimer.
; Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following
; disclaimer in the documentation and/or other materials provided with the distribution.
; Neither the name of the author nor the names of its contributors may be used to endorse or promote
; products derived from this software without specific prior written permission.
;
; THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS
; OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
; AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR
; CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
; CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
; SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
; THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
; OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
; POSSIBILITY OF SUCH DAMAGE.
(cond-expand
[chicken-compile-shared]
[else (declare (unit regex))] )
(declare
(usual-integrations)
(disable-interrupts)
; (disable-warning var)
(fixnum)
(export
regexp? regexp
string-match string-match-positions string-search string-search-positions
string-split-fields string-substitute string-substitute*
glob->regexp
grep
regexp-escape
irregex string->irregex sre->irregex string->sre
irregex? irregex-match-data?
irregex-new-matches irregex-reset-matches!
irregex-match-start irregex-match-end irregex-match-substring
irregex-match-num-submatches
irregex-search irregex-search/matches irregex-match irregex-match-string
irregex-fold irregex-replace irregex-replace/all irregex-apply-match
irregex-dfa irregex-dfa/search irregex-dfa/extract
irregex-nfa irregex-flags irregex-submatches irregex-lengths irregex-names
))
(cond-expand
[paranoia]
[else
(declare
(no-bound-checks)
(no-procedure-checks) ) ] )
(include "unsafe-declarations.scm")
(register-feature! 'regex 'irregex)
(include "irregex.scm")
;;; Record `regexp'
(define-record regexp x)
(define (regexp pat #!optional caseless extended utf8)
(if (regexp? pat)
pat
(make-regexp
(apply
irregex
pat
(let ((opts '()))
(when caseless (set! opts (cons 'i opts)))
(when extended (set! opts (cons 'x opts)))
(when utf8 (set! opts (cons 'utf8 opts)))
opts))) ) )
(define (unregexp x)
(cond ((regexp? x) (regexp-x x))
((irregex? x) x)
(else (irregex x))))
;;; Basic `regexp' operations
(define (string-match rx str)
(let ((rx (unregexp rx)))
(and-let* ((m (irregex-match rx str)))
(let loop ((i (irregex-match-num-submatches m))
(res '()))
(if (fx<= i 0)
(cons str res)
(loop (fx- i 1) (cons (irregex-match-substring m i) res)))))))
(define (string-match-positions rx str)
(let ((rx (unregexp rx)))
(and-let* ((m (irregex-match rx str)))
(let loop ((i (irregex-match-num-submatches m))
(res '()))
(if (fx<= i 0)
(cons (list 0 (string-length str)) res)
(loop (fx- i 1) (cons (list (irregex-match-start-index m i)
(irregex-match-end-index m i))
res)))))))
(define (string-search rx str #!optional (start 0) (range (string-length str)))
(let ((rx (unregexp rx)))
(let ((n (string-length str)))
(and-let* ((m (irregex-search rx str start (min n (fx+ start range)))))
(let loop ((i (irregex-match-num-submatches m))
(res '()))
(if (fx< i 0)
res
(loop (fx- i 1) (cons (irregex-match-substring m i) res))))))))
(define (string-search-positions rx str #!optional (start 0) (range (string-length str)))
(let ((rx (unregexp rx)))
(let ((n (string-length str)))
(and-let* ((m (irregex-search rx str start (min n (fx+ start range)))))
(let loop ((i (irregex-match-num-submatches m))
(res '()))
(if (fx< i 0)
res
(loop (fx- i 1) (cons (list (irregex-match-start-index m i)
(irregex-match-end-index m i))
res))))))))
;;; Split string into fields:
(define string-split-fields
(let ([reverse reverse]
[substring substring]
[string-search-positions string-search-positions] )
(lambda (rx str . mode-and-start)
(##sys#check-string str 'string-split-fields)
(let* ([argc (length mode-and-start)]
[len (##sys#size str)]
[mode (if (fx> argc 0) (car mode-and-start) #t)]
[start (if (fx> argc 1) (cadr mode-and-start) 0)]
[fini (case mode
[(#:suffix)
(lambda (ms start)
(if (fx< start len)
(##sys#error 'string-split-fields
"record does not end with suffix" str rx)
(reverse ms) ) ) ]
[(#:infix)
(lambda (ms start)
(if (fx>= start len)
(reverse (cons "" ms))
(reverse (cons (substring str start len) ms)) ) ) ]
[else (lambda (ms start) (reverse ms)) ] ) ]
[fetch (case mode
[(#:infix #:suffix) (lambda (start from to) (substring str start from))]
[else (lambda (start from to) (substring str from to))] ) ] )
(let loop ([ms '()] [start start])
(let ([m (string-search-positions rx str start)])
(if m
(let* ([mp (car m)]
[from (car mp)]
[to (cadr mp)] )
(if (fx= from to)
(if (fx= to len)
(fini ms start)
(loop (cons (fetch start (fx+ from 1) (fx+ to 2)) ms) (fx+ to 1)) )
(loop (cons (fetch start from to) ms) to) ) )
(fini ms start) ) ) ) ) ) ) )
;;; Substitute matching strings:
(define string-substitute
(let ([substring substring]
[reverse reverse]
[make-string make-string]
[string-search-positions string-search-positions] )
(lambda (rx subst string . flag)
(##sys#check-string subst 'string-substitute)
(##sys#check-string string 'string-substitute)
(let* ([which (if (pair? flag) (car flag) 1)]
[substlen (##sys#size subst)]
(strlen (##sys#size string))
[substlen-1 (fx- substlen 1)]
[result '()]
[total 0] )
(define (push x)
(set! result (cons x result))
(set! total (fx+ total (##sys#size x))) )
(define (substitute matches)
(let loop ([start 0] [index 0])
(if (fx>= index substlen-1)
(push (if (fx= start 0) subst (substring subst start substlen)))
(let ([c (##core#inline "C_subchar" subst index)]
[index+1 (fx+ index 1)] )
(if (char=? c #\\)
(let ([c2 (##core#inline "C_subchar" subst index+1)])
(if (and (not (char=? #\\ c2)) (char-numeric? c2))
(let ([mi (list-ref matches (fx- (char->integer c2) 48))])
(push (substring subst start index))
(push (substring string (car mi) (cadr mi)))
(loop (fx+ index 2) index+1) )
(loop start (fx+ index+1 1)) ) )
(loop start index+1) ) ) ) ) )
(let loop ([index 0] [count 1])
(let ((matches (and (fx< index strlen)
(string-search-positions rx string index))))
(cond [matches
(let* ([range (car matches)]
[upto (cadr range)] )
(cond ((fx= 0 (fx- (cadr range) (car range)))
(##sys#error
'string-substitute "empty substitution match"
rx) )
((or (not (fixnum? which)) (fx= count which))
(push (substring string index (car range)))
(substitute matches)
(loop upto #f) )
(else
(push (substring string index upto))
(loop upto (fx+ count 1)) ) ) ) ]
[else
(push (substring string index (##sys#size string)))
(##sys#fragments->string total (reverse result)) ] ) ) ) ) ) ) )
(define string-substitute*
(let ([string-substitute string-substitute])
(lambda (str smap . mode)
(##sys#check-string str 'string-substitute*)
(##sys#check-list smap 'string-substitute*)
(let ((mode (and (pair? mode) (car mode))))
(let loop ((str str) (smap smap))
(if (null? smap)
str
(let ((sm (car smap)))
(loop (string-substitute (car sm) (cdr sm) str mode)
(cdr smap) ) ) ) ) ) ) ) )
;;; Glob support:
(define glob->regexp
(let ((list->string list->string)
(string->list string->list)
(regexp regexp))
(lambda (s #!optional sre?)
(##sys#check-string s 'glob->regexp)
(let ((sre
(cons
':
(let loop ((cs (string->list s)) (dir #t))
(if (null? cs)
'()
(let ((c (car cs))
(rest (cdr cs)) )
(cond ((char=? c #\*)
(if dir
`((or (: (~ ("./\\")) (* (~ ("/\\"))))
(* (~ ("./\\"))))
,@(loop rest #f))
`((* (~ ("/\\"))) ,@(loop rest #f))))
((char=? c #\?) (cons 'any (loop rest #f)))
((char=? c #\[)
(let loop2 ((rest rest) (s '()))
(cond ((not (pair? rest))
(error 'glob->regexp "unexpected end of character class" s))
((char=? #\] (car rest))
`((or ,@s) ,@(loop (cdr rest) #f)))
((and (pair? (cdr rest))
(pair? (cddr rest))
(char=? #\- (cadr rest)) )
(loop2 (cdddr rest) (cons `(/ ,(car rest) ,(caddr rest)) s)))
((and (pair? (cdr rest))
(char=? #\- (car rest)))
(loop2 (cddr rest)
(cons `(~ ,(cadr rest)) s)))
(else
(loop2 (cdr rest) (cons (car rest) s))))))
(else (cons c (loop rest (memq c '(#\\ #\/))))))))))))
(if sre? sre (regexp sre))))))
;;; Grep-like function on list:
(define grep
(let ((string-search string-search)
(regexp regexp))
(lambda (rx lst #!optional (acc (lambda (x) x)))
(##sys#check-list lst 'grep)
(##sys#check-closure acc 'grep)
(let ((rx (regexp rx)))
(let loop ((lst lst))
(if (null? lst)
'()
(let ((x (##sys#slot lst 0))
(r (##sys#slot lst 1)) )
(if (string-search rx (acc x))
(cons x (loop r))
(loop r) ) ) ) ) ) ) ) )
;;; Escape regular expression (suggested by Peter Bex):
(define regexp-escape
(let ([open-output-string open-output-string]
[get-output-string get-output-string] )
(lambda (str)
(##sys#check-string str 'regexp-escape)
(let ([out (open-output-string)]
[len (##sys#size str)] )
(let loop ([i 0])
(cond [(fx>= i len) (get-output-string out)]
[(memq (##core#inline "C_subchar" str i)
'(#\. #\\ #\? #\* #\+ #\^ #\$ #\( #\) #\[ #\] #\| #\{ #\}))
(##sys#write-char-0 #\\ out)
(##sys#write-char-0 (##core#inline "C_subchar" str i) out)
(loop (fx+ i 1)) ]
[else
(##sys#write-char-0 (##core#inline "C_subchar" str i) out)
(loop (fx+ i 1)) ] ) ) ) ) ) )
|
