FM / ice-9

/usr/share/guile/2.0/ice-9

Name	Size	Mode	Actions
and-let-star.scm	2593	0644	edit dl rm
binary-ports.scm	1921	0644	edit dl rm
boot-9.scm	154720	0644	edit dl rm
buffered-input.scm	4935	0644	edit dl rm
calling.scm	10790	0644	edit dl rm
channel.scm	5312	0644	edit dl rm
command-line.scm	18655	0644	edit dl rm
common-list.scm	9160	0644	edit dl rm
control.scm	4036	0644	edit dl rm
curried-definitions.scm	1829	0644	edit dl rm
debug.scm	1114	0644	edit dl rm
deprecated.scm	31993	0644	edit dl rm
documentation.scm	7432	0644	edit dl rm
eval-string.scm	2997	0644	edit dl rm
eval.scm	21354	0644	edit dl rm
expect.scm	5628	0644	edit dl rm
format.scm	76284	0644	edit dl rm
ftw.scm	24753	0644	edit dl rm
futures.scm	11186	0644	edit dl rm
gap-buffer.scm	10384	0644	edit dl rm
getopt-long.scm	16888	0644	edit dl rm
hash-table.scm	1813	0644	edit dl rm
hcons.scm	2614	0644	edit dl rm
history.scm	2343	0644	edit dl rm
i18n.scm	17778	0644	edit dl rm
iconv.scm	3735	0644	edit dl rm
lineio.scm	3941	0644	edit dl rm
list.scm	1319	0644	edit dl rm
local-eval.scm	9946	0644	edit dl rm
ls.scm	3275	0644	edit dl rm
mapping.scm	4955	0644	edit dl rm
match.scm	2045	0644	edit dl rm
match.upstream.scm	36459	0644	edit dl rm
networking.scm	3407	0644	edit dl rm
null.scm	1157	0644	edit dl rm
occam-channel.scm	7436	0644	edit dl rm
optargs.scm	16123	0644	edit dl rm
poe.scm	3382	0644	edit dl rm
poll.scm	6166	0644	edit dl rm
popen.scm	5806	0644	edit dl rm
posix.scm	2793	0644	edit dl rm
pretty-print.scm	16211	0644	edit dl rm
psyntax-pp.scm	166774	0644	edit dl rm
psyntax.scm	147118	0644	edit dl rm
q.scm	4297	0644	edit dl rm
quasisyntax.scm	5348	0644	edit dl rm
r4rs.scm	9645	0644	edit dl rm
r5rs.scm	1602	0644	edit dl rm
r6rs-libraries.scm	9164	0644	edit dl rm
rdelim.scm	7648	0644	edit dl rm
readline.scm	9786	0644	edit dl rm
receive.scm	1082	0644	edit dl rm
regex.scm	9084	0644	edit dl rm
runq.scm	8379	0644	edit dl rm
rw.scm	1047	0644	edit dl rm
safe-r5rs.scm	3814	0644	edit dl rm
safe.scm	1275	0644	edit dl rm
save-stack.scm	2197	0644	edit dl rm
scm-style-repl.scm	11986	0644	edit dl rm
serialize.scm	3859	0644	edit dl rm
session.scm	18143	0644	edit dl rm
slib.scm	1583	0644	edit dl rm
stack-catch.scm	1983	0644	edit dl rm
streams.scm	7488	0644	edit dl rm
string-fun.scm	8798	0644	edit dl rm
syncase.scm	1556	0644	edit dl rm
threads.scm	6388	0644	edit dl rm
time.scm	2088	0644	edit dl rm
top-repl.scm	2812	0644	edit dl rm
unicode.scm	1005	0644	edit dl rm
vlist.scm	22081	0644	edit dl rm
weak-vector.scm	1288	0644	edit dl rm

Edit: /usr/share/guile/2.0/ice-9/string-fun.scm (8798B)

;;;; string-fun.scm --- string manipulation functions
;;;;
;;;; 	Copyright (C) 1995, 1996, 1997, 1999, 2001, 2006 Free Software Foundation, Inc.
;;;; 
;;;; This library is free software; you can redistribute it and/or
;;;; modify it under the terms of the GNU Lesser General Public
;;;; License as published by the Free Software Foundation; either
;;;; version 3 of the License, or (at your option) any later version.
;;;; 
;;;; This library 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
;;;; Lesser General Public License for more details.
;;;; 
;;;; You should have received a copy of the GNU Lesser General Public
;;;; License along with this library; if not, write to the Free Software
;;;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
;;;;

(define-module (ice-9 string-fun)
  :export (split-after-char split-before-char split-discarding-char
	   split-after-char-last split-before-char-last
	   split-discarding-char-last split-before-predicate
	   split-after-predicate split-discarding-predicate
	   separate-fields-discarding-char separate-fields-after-char
	   separate-fields-before-char string-prefix-predicate string-prefix=?
	   sans-surrounding-whitespace sans-trailing-whitespace
	   sans-leading-whitespace sans-final-newline has-trailing-newline?))

;;;;
;;;
;;; Various string funcitons, particularly those that take
;;; advantage of the "shared substring" capability.
;;;

;;; {String Fun: Dividing Strings Into Fields}
;;; 
;;; The names of these functions are very regular.
;;; Here is a grammar of a call to one of these:
;;;
;;;   <string-function-invocation>
;;;   := (<action>-<seperator-disposition>-<seperator-determination> <seperator-param> <str> <ret>)
;;;
;;; <str>    = the string
;;;
;;; <ret>    = The continuation.  String functions generally return
;;;	       multiple values by passing them to this procedure.
;;;
;;; <action> =    split
;;;		| separate-fields
;;;
;;;		"split" means to divide a string into two parts.
;;;			<ret> will be called with two arguments.
;;;
;;;		"separate-fields" means to divide a string into as many
;;;			parts as possible.  <ret> will be called with
;;;			however many fields are found.
;;;
;;; <seperator-disposition> = 	  before
;;;				| after
;;;				| discarding
;;;
;;;		"before" means to leave the seperator attached to
;;;			the beginning of the field to its right.
;;;		"after" means to leave the seperator attached to
;;;			the end of the field to its left.
;;;		"discarding" means to discard seperators.
;;;
;;;		Other dispositions might be handy.  For example, "isolate"
;;;		could mean to treat the separator as a field unto itself.
;;;
;;; <seperator-determination> =	  char
;;;				| predicate
;;;
;;;		"char" means to use a particular character as field seperator.
;;;		"predicate" means to check each character using a particular predicate.
;;;		
;;;		Other determinations might be handy.  For example, "character-set-member".
;;;
;;; <seperator-param> = A parameter that completes the meaning of the determinations.
;;;			For example, if the determination is "char", then this parameter
;;;			says which character.  If it is "predicate", the parameter is the
;;;			predicate.
;;;
;;;
;;; For example:
;;;
;;;		(separate-fields-discarding-char #\, "foo, bar, baz, , bat" list)
;;;		=> ("foo" " bar" " baz" " " " bat")
;;;
;;;		(split-after-char #\- 'an-example-of-split list)
;;;		=> ("an-" "example-of-split")
;;;
;;; As an alternative to using a determination "predicate", or to trying to do anything
;;; complicated with these functions, consider using regular expressions.
;;;

(define (split-after-char char str ret)
  (let ((end (cond
	      ((string-index str char) => 1+)
	      (else (string-length str)))))
    (ret (substring str 0 end)
	 (substring str end))))

(define (split-before-char char str ret)
  (let ((end (or (string-index str char)
		 (string-length str))))
    (ret (substring str 0 end)
	 (substring str end))))

(define (split-discarding-char char str ret)
  (let ((end (string-index str char)))
    (if (not end)
	(ret str "")
	(ret (substring str 0 end)
	     (substring str (1+ end))))))

(define (split-after-char-last char str ret)
  (let ((end (cond
	      ((string-rindex str char) => 1+)
	      (else 0))))
    (ret (substring str 0 end)
	 (substring str end))))

(define (split-before-char-last char str ret)
  (let ((end (or (string-rindex str char) 0)))
    (ret (substring str 0 end)
	 (substring str end))))

(define (split-discarding-char-last char str ret)
  (let ((end (string-rindex str char)))
    (if (not end)
	(ret str "")
	(ret (substring str 0 end)
	     (substring str (1+ end))))))

(define (split-before-predicate pred str ret)
  (let loop ((n 0))
    (cond
     ((= n (string-length str))		(ret str ""))
     ((not (pred (string-ref str n)))	(loop (1+ n)))
     (else				(ret (substring str 0 n)
					     (substring str n))))))
(define (split-after-predicate pred str ret)
  (let loop ((n 0))
    (cond
     ((= n (string-length str))		(ret str ""))
     ((not (pred (string-ref str n)))	(loop (1+ n)))
     (else				(ret (substring str 0 (1+ n))
					     (substring str (1+ n)))))))

(define (split-discarding-predicate pred str ret)
  (let loop ((n 0))
    (cond
     ((= n (string-length str))		(ret str ""))
     ((not (pred (string-ref str n)))	(loop (1+ n)))
     (else				(ret (substring str 0 n)
					     (substring str (1+ n)))))))

(define (separate-fields-discarding-char ch str ret)
  (let loop ((fields '())
	     (str str))
    (cond
     ((string-rindex str ch)
      => (lambda (w) (loop (cons (substring str (+ 1 w)) fields)
			   (substring str 0 w))))
     (else (apply ret str fields)))))

(define (separate-fields-after-char ch str ret)
  (reverse
   (let loop ((fields '())
             (str str))
     (cond
      ((string-index str ch)
       => (lambda (w) (loop (cons (substring str 0 (+ 1 w)) fields)
                           (substring str (+ 1 w)))))
      (else (apply ret str fields))))))

(define (separate-fields-before-char ch str ret)
  (let loop ((fields '())
	     (str str))
    (cond
     ((string-rindex str ch)
      => (lambda (w) (loop (cons (substring str w) fields)
			     (substring str 0 w))))
     (else (apply ret str fields)))))

;;; {String Fun: String Prefix Predicates}
;;;
;;; Very simple:
;;;
;;; (define-public ((string-prefix-predicate pred?) prefix str)
;;;  (and (<= (string-length prefix) (string-length str))
;;;	  (pred? prefix (substring str 0 (string-length prefix)))))
;;;
;;; (define-public string-prefix=? (string-prefix-predicate string=?))
;;;

(define (string-prefix-predicate pred?)
  (lambda (prefix str)
    (and (<= (string-length prefix) (string-length str))
         (pred? prefix (substring str 0 (string-length prefix))))))

(define string-prefix=? (string-prefix-predicate string=?))

;;; {String Fun: Strippers}
;;;
;;; <stripper> = sans-<removable-part>
;;;
;;; <removable-part> = 	  surrounding-whitespace
;;;			| trailing-whitespace
;;;			| leading-whitespace
;;;			| final-newline
;;;

(define (sans-surrounding-whitespace s)
  (let ((st 0)
	(end (string-length s)))
    (while (and (< st (string-length s))
		(char-whitespace? (string-ref s st)))
	   (set! st (1+ st)))
    (while (and (< 0 end)
		(char-whitespace? (string-ref s (1- end))))
	   (set! end (1- end)))
    (if (< end st)
	""
	(substring s st end))))

(define (sans-trailing-whitespace s)
  (let ((st 0)
	(end (string-length s)))
    (while (and (< 0 end)
		(char-whitespace? (string-ref s (1- end))))
	   (set! end (1- end)))
    (if (< end st)
	""
	(substring s st end))))

(define (sans-leading-whitespace s)
  (let ((st 0)
	(end (string-length s)))
    (while (and (< st (string-length s))
		(char-whitespace? (string-ref s st)))
	   (set! st (1+ st)))
    (if (< end st)
	""
	(substring s st end))))

(define (sans-final-newline str)
  (cond
   ((= 0 (string-length str))
    str)

((char=? #\nl (string-ref str (1- (string-length str))))
    (substring str 0 (1- (string-length str))))

(else str)))

;;; {String Fun: has-trailing-newline?}
;;;

(define (has-trailing-newline? str)
  (and (< 0 (string-length str))
       (char=? #\nl (string-ref str (1- (string-length str))))))

;;; {String Fun: with-regexp-parts}

;;; This relies on the older, hairier regexp interface, which we don't
;;; particularly want to implement, and it's not used anywhere, so
;;; we're just going to drop it for now.
;;; (define-public (with-regexp-parts regexp fields str return fail)
;;;   (let ((parts (regexec regexp str fields)))
;;;     (if (number? parts)
;;;         (fail parts)
;;;         (apply return parts))))

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