Newer
Older
;;; -*- Log: code.log; Package: Lisp -*-
;;;
;;; **********************************************************************
;;; This code was written as part of the CMU Common Lisp project at
;;; Carnegie Mellon University, and has been placed in the public domain.
;;;
(ext:file-comment
"$Header: /Volumes/share2/src/cmucl/cvs2git/cvsroot/src/code/string.lisp,v 1.8 1996/07/12 18:55:24 ram Exp $")
;;; **********************************************************************
;;;
;;; Functions to implement strings for Spice Lisp
;;; Written by David Dill
;;; Rewritten by Skef Wholey, Bill Chiles and Rob MacLachlan.
;;;
;;; Runs in the standard Spice Lisp environment.
;;;
;;; ****************************************************************
;;;
(in-package "LISP")
(export '(char schar string
string= string-equal string< string> string<= string>= string/=
string-lessp string-greaterp string-not-lessp string-not-greaterp
string-not-equal
make-string
string-trim string-left-trim string-right-trim
string-upcase
string-downcase string-capitalize nstring-upcase nstring-downcase
nstring-capitalize))
(defun string (X)
"Coerces X into a string. If X is a string, X is returned. If X is a
symbol, X's pname is returned. If X is a character then a one element
string containing that character is returned. If X cannot be coerced
into a string, an error occurs."
(cond ((stringp x) x)
((symbolp x) (symbol-name x))
((characterp x)
(let ((res (make-string 1)))
(setf (schar res 0) x) res))
(t
(error "~S cannot be coerced to a string." x))))
;;; With-One-String is used to set up some string hacking things. The keywords
;;; are parsed, and the string is hacked into a simple-string.
(eval-when (compile)
(defmacro with-one-string (string start end cum-offset &rest forms)
`(let ((,string (if (stringp ,string) ,string (string ,string))))
(with-array-data ((,string ,string :offset-var ,cum-offset)
(,start ,start)
(,end (or ,end (length (the vector ,string)))))
,@forms)))
)
;;; With-String is like With-One-String, but doesn't parse keywords.
(eval-when (compile)
(defmacro with-string (string &rest forms)
`(let ((,string (if (stringp ,string) ,string (string ,string))))
(with-array-data ((,string ,string)
(start)
(end (length (the vector ,string))))
,@forms)))
)
;;; With-Two-Strings is used to set up string comparison operations. The
;;; keywords are parsed, and the strings are hacked into simple-strings.
(eval-when (compile)
(defmacro with-two-strings (string1 string2 start1 end1 cum-offset-1
start2 end2 &rest forms)
`(let ((,string1 (if (stringp ,string1) ,string1 (string ,string1)))
(,string2 (if (stringp ,string2) ,string2 (string ,string2))))
(with-array-data ((,string1 ,string1 :offset-var ,cum-offset-1)
(,start1 ,start1)
(,end1 (or ,end1 (length (the vector ,string1)))))
(with-array-data ((,string2 ,string2)
(,start2 ,start2)
(,end2 (or ,end2 (length (the vector ,string2)))))
,@forms))))
(defun char (string index)
"Given a string and a non-negative integer index less than the length of
the string, returns the character object representing the character at
that position in the string."
(declare (optimize (safety 1)))
(declare (optimize (safety 1)))
(setf (char string index) new-el))
(defun schar (string index)
"SCHAR returns the character object at an indexed position in a string
just as CHAR does, except the string must be a simple-string."
(declare (optimize (safety 1)))
(schar string index))
(defun %scharset (string index new-el)
(declare (optimize (safety 1)))
(setf (schar string index) new-el))
(defun string=* (string1 string2 start1 end1 start2 end2)
(with-two-strings string1 string2 start1 end1 offset1 start2 end2
(not (%sp-string-compare string1 start1 end1 string2 start2 end2))))
(defun string/=* (string1 string2 start1 end1 start2 end2)
(with-two-strings string1 string2 start1 end1 offset1 start2 end2
(let ((comparison (%sp-string-compare string1 start1 end1
string2 start2 end2)))
(if comparison (- (the fixnum comparison) offset1)))))
(eval-when (compile eval)
;;; Lessp is true if the desired expansion is for string<* or string<=*.
;;; Equalp is true if the desired expansion is for string<=* or string>=*.
(defmacro string<>=*-body (lessp equalp)
(let ((offset1 (gensym)))
`(with-two-strings string1 string2 start1 end1 ,offset1 start2 end2
(let ((index (%sp-string-compare string1 start1 end1
string2 start2 end2)))
(if index
(cond ((= (the fixnum index) (the fixnum end1))
,(if lessp
`(- (the fixnum index) ,offset1)
`nil))
((= (+ (the fixnum index) (- start2 start1))
(the fixnum end2))
,(if lessp
`nil
`(- (the fixnum index) ,offset1)))
((,(if lessp 'char< 'char>)
(schar string1 index)
(schar string2 (+ (the fixnum index) (- start2 start1))))
(- (the fixnum index) ,offset1))
(t nil))
,(if equalp `(- (the fixnum end1) ,offset1) 'nil))))))
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
) ; eval-when
(defun string<* (string1 string2 start1 end1 start2 end2)
(declare (fixnum start1 start2))
(string<>=*-body t nil))
(defun string>* (string1 string2 start1 end1 start2 end2)
(declare (fixnum start1 start2))
(string<>=*-body nil nil))
(defun string<=* (string1 string2 start1 end1 start2 end2)
(declare (fixnum start1 start2))
(string<>=*-body t t))
(defun string>=* (string1 string2 start1 end1 start2 end2)
(declare (fixnum start1 start2))
(string<>=*-body nil t))
(defun string< (string1 string2 &key (start1 0) end1 (start2 0) end2)
"Given two strings, if the first string is lexicographically less than
the second string, returns the longest common prefix (using char=)
of the two strings. Otherwise, returns ()."
(string<* string1 string2 start1 end1 start2 end2))
(defun string> (string1 string2 &key (start1 0) end1 (start2 0) end2)
"Given two strings, if the first string is lexicographically greater than
the second string, returns the longest common prefix (using char=)
of the two strings. Otherwise, returns ()."
(string>* string1 string2 start1 end1 start2 end2))
(defun string<= (string1 string2 &key (start1 0) end1 (start2 0) end2)
"Given two strings, if the first string is lexicographically less than
or equal to the second string, returns the longest common prefix
(using char=) of the two strings. Otherwise, returns ()."
(string<=* string1 string2 start1 end1 start2 end2))
(defun string>= (string1 string2 &key (start1 0) end1 (start2 0) end2)
"Given two strings, if the first string is lexicographically greater
than or equal to the second string, returns the longest common prefix
(using char=) of the two strings. Otherwise, returns ()."
(string>=* string1 string2 start1 end1 start2 end2))
(defun string= (string1 string2 &key (start1 0) end1 (start2 0) end2)
"Given two strings (string1 and string2), and optional integers start1,
start2, end1 and end2, compares characters in string1 to characters in
string2 (using char=)."
(string=* string1 string2 start1 end1 start2 end2))
(defun string/= (string1 string2 &key (start1 0) end1 (start2 0) end2)
"Given two strings, if the first string is not lexicographically equal
to the second string, returns the longest common prefix (using char=)
of the two strings. Otherwise, returns ()."
(string/=* string1 string2 start1 end1 start2 end2))
(eval-when (compile eval)
;;; STRING-NOT-EQUAL-LOOP is used to generate character comparison loops for
;;; STRING-EQUAL and STRING-NOT-EQUAL.
(defmacro string-not-equal-loop (end end-value
&optional (abort-value nil abortp))
(declare (fixnum end))
(let ((end-test (if (= end 1)
`(= index1 (the fixnum end1))
`(= index2 (the fixnum end2)))))
`(do ((index1 start1 (1+ index1))
(index2 start2 (1+ index2)))
(,(if abortp
end-test
`(or ,end-test
(not (char-equal (schar string1 index1)
(schar string2 index2)))))
,end-value)
(declare (fixnum index1 index2))
,@(if abortp
`((if (not (char-equal (schar string1 index1)
(schar string2 index2)))
(return ,abort-value)))))))
) ; eval-when
(defun string-equal (string1 string2 &key (start1 0) end1 (start2 0) end2)
"Given two strings (string1 and string2), and optional integers start1,
start2, end1 and end2, compares characters in string1 to characters in
string2 (using char-equal)."
(declare (fixnum start1 start2))
(with-two-strings string1 string2 start1 end1 offset1 start2 end2
(let ((slen1 (- (the fixnum end1) start1))
(slen2 (- (the fixnum end2) start2)))
(declare (fixnum slen1 slen2))
(if (or (minusp slen1) (minusp slen2))
;;prevent endless looping later.
(error "Improper bounds for string comparison."))
(if (= slen1 slen2)
;;return () immediately if lengths aren't equal.
(string-not-equal-loop 1 t nil)))))
(defun string-not-equal (string1 string2 &key (start1 0) end1 (start2 0) end2)
"Given two strings, if the first string is not lexicographically equal
to the second string, returns the longest common prefix (using char-equal)
of the two strings. Otherwise, returns ()."
(with-two-strings string1 string2 start1 end1 offset1 start2 end2
(let ((slen1 (- end1 start1))
(slen2 (- end2 start2)))
(declare (fixnum slen1 slen2))
(if (or (minusp slen1) (minusp slen2))
;;prevent endless looping later.
(error "Improper bounds for string comparison."))
(cond ((or (minusp slen1) (or (minusp slen2)))
(error "Improper substring for comparison."))
((= slen1 slen2)
(string-not-equal-loop 1 nil (- index1 offset1)))
((< slen1 slen2)
(string-not-equal-loop 1 (- index1 offset1)))
(t
(string-not-equal-loop 2 (- index1 offset1)))))))
(eval-when (compile eval)
;;; STRING-LESS-GREATER-EQUAL-TESTS returns a test on the lengths of string1
;;; and string2 and a test on the current characters from string1 and string2
;;; for the following macro.
(defun string-less-greater-equal-tests (lessp equalp)
(if lessp
(if equalp
;; STRING-NOT-GREATERP
(values '<= `(not (char-greaterp char1 char2)))
;; STRING-LESSP
(values '< `(char-lessp char1 char2)))
(if equalp
;; STRING-NOT-LESSP
(values '>= `(not (char-lessp char1 char2)))
;; STRING-GREATERP
(values '> `(char-greaterp char1 char2)))))
(defmacro string-less-greater-equal (lessp equalp)
(multiple-value-bind (length-test character-test)
(string-less-greater-equal-tests lessp equalp)
`(with-two-strings string1 string2 start1 end1 offset1 start2 end2
(let ((slen1 (- (the fixnum end1) start1))
(slen2 (- (the fixnum end2) start2)))
(declare (fixnum slen1 slen2))
(if (or (minusp slen1) (minusp slen2))
;;prevent endless looping later.
(error "Improper bounds for string comparison."))
(do ((index1 start1 (1+ index1))
(index2 start2 (1+ index2))
(char1)
(char2))
((or (= index1 (the fixnum end1)) (= index2 (the fixnum end2)))
(if (,length-test slen1 slen2) (- index1 offset1)))
(declare (fixnum index1 index2))
(setq char1 (schar string1 index1))
(setq char2 (schar string2 index2))
(if (not (char-equal char1 char2))
(if ,character-test
(return (- index1 offset1))
(return ()))))))))
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
) ; eval-when
(defun string-lessp* (string1 string2 start1 end1 start2 end2)
(declare (fixnum start1 start2))
(string-less-greater-equal t nil))
(defun string-greaterp* (string1 string2 start1 end1 start2 end2)
(declare (fixnum start1 start2))
(string-less-greater-equal nil nil))
(defun string-not-lessp* (string1 string2 start1 end1 start2 end2)
(declare (fixnum start1 start2))
(string-less-greater-equal nil t))
(defun string-not-greaterp* (string1 string2 start1 end1 start2 end2)
(declare (fixnum start1 start2))
(string-less-greater-equal t t))
(defun string-lessp (string1 string2 &key (start1 0) end1 (start2 0) end2)
"Given two strings, if the first string is lexicographically less than
the second string, returns the longest common prefix (using char-equal)
of the two strings. Otherwise, returns ()."
(string-lessp* string1 string2 start1 end1 start2 end2))
(defun string-greaterp (string1 string2 &key (start1 0) end1 (start2 0) end2)
"Given two strings, if the first string is lexicographically greater than
the second string, returns the longest common prefix (using char-equal)
of the two strings. Otherwise, returns ()."
(string-greaterp* string1 string2 start1 end1 start2 end2))
(defun string-not-lessp (string1 string2 &key (start1 0) end1 (start2 0) end2)
"Given two strings, if the first string is lexicographically greater
than or equal to the second string, returns the longest common prefix
(using char-equal) of the two strings. Otherwise, returns ()."
(string-not-lessp* string1 string2 start1 end1 start2 end2))
(defun string-not-greaterp (string1 string2 &key (start1 0) end1 (start2 0)
end2)
"Given two strings, if the first string is lexicographically less than
or equal to the second string, returns the longest common prefix
(using char-equal) of the two strings. Otherwise, returns ()."
(string-not-greaterp* string1 string2 start1 end1 start2 end2))
(defun make-string (count &key ((:initial-element fill-char)))
"Given a character count and an optional fill character, makes and returns
a new string Count long filled with the fill character."
(declare (fixnum count))
(if fill-char
(do ((i 0 (1+ i))
(string (make-string count)))
((= i count) string)
(declare (fixnum i))
(setf (schar string i) fill-char))
(make-string count)))
(defun string-upcase (string &key (start 0) end)
"Given a string, returns a new string that is a copy of it with
all lower case alphabetic characters converted to uppercase."
(declare (fixnum start))
(let* ((string (if (stringp string) string (string string)))
(slen (length string)))
(declare (fixnum slen))
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
(with-one-string string start end offset
(let ((offset-slen (+ slen offset))
(newstring (make-string slen)))
(declare (fixnum offset-slen))
(do ((index offset (1+ index))
(new-index 0 (1+ new-index)))
((= index start))
(declare (fixnum index new-index))
(setf (schar newstring new-index) (schar string index)))
(do ((index start (1+ index))
(new-index (- start offset) (1+ new-index)))
((= index (the fixnum end)))
(declare (fixnum index new-index))
(setf (schar newstring new-index)
(char-upcase (schar string index))))
(do ((index end (1+ index))
(new-index (- (the fixnum end) offset) (1+ new-index)))
((= index offset-slen))
(declare (fixnum index new-index))
(setf (schar newstring new-index) (schar string index)))
newstring))))
(defun string-downcase (string &key (start 0) end)
"Given a string, returns a new string that is a copy of it with
all upper case alphabetic characters converted to lowercase."
(declare (fixnum start))
(let* ((string (if (stringp string) string (string string)))
(slen (length string)))
(declare (fixnum slen))
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
(with-one-string string start end offset
(let ((offset-slen (+ slen offset))
(newstring (make-string slen)))
(declare (fixnum offset-slen))
(do ((index offset (1+ index))
(new-index 0 (1+ new-index)))
((= index start))
(declare (fixnum index new-index))
(setf (schar newstring new-index) (schar string index)))
(do ((index start (1+ index))
(new-index (- start offset) (1+ new-index)))
((= index (the fixnum end)))
(declare (fixnum index new-index))
(setf (schar newstring new-index)
(char-downcase (schar string index))))
(do ((index end (1+ index))
(new-index (- (the fixnum end) offset) (1+ new-index)))
((= index offset-slen))
(declare (fixnum index new-index))
(setf (schar newstring new-index) (schar string index)))
newstring))))
(defun string-capitalize (string &key (start 0) end)
"Given a string, returns a copy of the string with the first
character of each ``word'' converted to upper-case, and remaining
chars in the word converted to lower case. A ``word'' is defined
to be a string of case-modifiable characters delimited by
non-case-modifiable chars."
(declare (fixnum start))
(let* ((string (if (stringp string) string (string string)))
(slen (length string)))
(declare (fixnum slen))
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
(with-one-string string start end offset
(let ((offset-slen (+ slen offset))
(newstring (make-string slen)))
(declare (fixnum offset-slen))
(do ((index offset (1+ index))
(new-index 0 (1+ new-index)))
((= index start))
(declare (fixnum index new-index))
(setf (schar newstring new-index) (schar string index)))
(do ((index start (1+ index))
(new-index (- start offset) (1+ new-index))
(newword t)
(char ()))
((= index (the fixnum end)))
(declare (fixnum index new-index))
(setq char (schar string index))
(cond ((not (alphanumericp char))
(setq newword t))
(newword
;;char is first case-modifiable after non-case-modifiable
(setq char (char-upcase char))
(setq newword ()))
;;char is case-modifiable, but not first
(t (setq char (char-downcase char))))
(setf (schar newstring new-index) char))
(do ((index end (1+ index))
(new-index (- (the fixnum end) offset) (1+ new-index)))
((= index offset-slen))
(declare (fixnum index new-index))
(setf (schar newstring new-index) (schar string index)))
newstring))))
(defun nstring-upcase (string &key (start 0) end)
"Given a string, returns that string with all lower case alphabetic
characters converted to uppercase."
(declare (fixnum start))
(let ((save-header string))
(with-one-string string start end offset
(do ((index start (1+ index)))
((= index (the fixnum end)))
(declare (fixnum index))
(setf (schar string index) (char-upcase (schar string index)))))
save-header))
(defun nstring-downcase (string &key (start 0) end)
"Given a string, returns that string with all upper case alphabetic
characters converted to lowercase."
(declare (fixnum start))
(let ((save-header string))
(with-one-string string start end offset
(do ((index start (1+ index)))
((= index (the fixnum end)))
(declare (fixnum index))
(setf (schar string index) (char-downcase (schar string index)))))
(defun nstring-capitalize (string &key (start 0) end)
"Given a string, returns that string with the first
character of each ``word'' converted to upper-case, and remaining
chars in the word converted to lower case. A ``word'' is defined
to be a string of case-modifiable characters delimited by
non-case-modifiable chars."
(declare (fixnum start))
(let ((save-header string))
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
(with-one-string string start end offset
(do ((index start (1+ index))
(newword t)
(char ()))
((= index (the fixnum end)))
(declare (fixnum index))
(setq char (schar string index))
(cond ((not (alphanumericp char))
(setq newword t))
(newword
;;char is first case-modifiable after non-case-modifiable
(setf (schar string index) (char-upcase char))
(setq newword ()))
(t
(setf (schar string index) (char-downcase char))))))
save-header))
(defun string-left-trim (char-bag string)
"Given a set of characters (a list or string) and a string, returns
a copy of the string with the characters in the set removed from the
left end."
(with-string string
(do ((index start (1+ index)))
((or (= index (the fixnum end))
(not (find (schar string index) char-bag)))
(subseq (the simple-string string) index end))
(declare (fixnum index)))))
(defun string-right-trim (char-bag string)
"Given a set of characters (a list or string) and a string, returns
a copy of the string with the characters in the set removed from the
right end."
(with-string string
(do ((index (1- (the fixnum end)) (1- index)))
((or (< index start) (not (find (schar string index) char-bag)))
(subseq (the simple-string string) start (1+ index)))
(declare (fixnum index)))))
(defun string-trim (char-bag string)
"Given a set of characters (a list or string) and a string, returns a
copy of the string with the characters in the set removed from both
ends."
(with-string string
(let* ((left-end (do ((index start (1+ index)))
((or (= index (the fixnum end))
(not (find (schar string index) char-bag)))
index)
(declare (fixnum index))))
(right-end (do ((index (1- (the fixnum end)) (1- index)))
((or (< index left-end)
(not (find (schar string index) char-bag)))
(1+ index))
(declare (fixnum index)))))
(subseq (the simple-string string) left-end right-end))))