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;;; srfi-118 - simple adjustable-size strings
;;;
;;; Copyright (c) 2015-2016 Shiro Kawai <shiro@acm.org>
;;;
;;; Redistribution and use in source and binary forms, with or without
;;; modification, are permitted provided that the following conditions
;;; are met:
;;;
;;; 1. Redistributions of source code must retain the above copyright
;;; notice, this list of conditions and the following disclaimer.
;;;
;;; 2. 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.
;;;
;;; 3. Neither the name of the authors 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
;;; OWNER 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.
;;;
;; In Gauche, string bodies are immutable and we just use an extra
;; indirection to realize mutable strings. So it is trivial to
;; implement size-changing mutation, but it doesn't give you
;; any performance advantage---the cost of string-append! and string-replace!
;; are the same as string-append and string-replace, respectively.
;; We include srfi-118 for the portability.
(define-module srfi-118
(use srfi-13)
(export string-append!
string-replace!))
(select-module srfi-118)
(define (string-append! string . vals)
($ (with-module gauche.internal %string-replace-body!) string
(with-output-to-string
(^[]
(display string)
(for-each (^v (if (or (char? v) (string? v))
(display v)
(error "string-append! expects characters/strings in the arguments, but got:" v)))
vals)))))
(define (string-replace! dst dst-start dst-end src . args)
($ (with-module gauche.internal %string-replace-body!) dst
(apply string-replace dst src dst-start dst-end args)))
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