1;;;
2;;; srfi-118 - simple adjustable-size strings
3;;;
4;;;   Copyright (c) 2015-2020  Shiro Kawai  <shiro@acm.org>
5;;;
6;;;   Redistribution and use in source and binary forms, with or without
7;;;   modification, are permitted provided that the following conditions
8;;;   are met:
9;;;
10;;;   1. Redistributions of source code must retain the above copyright
11;;;      notice, this list of conditions and the following disclaimer.
12;;;
13;;;   2. Redistributions in binary form must reproduce the above copyright
14;;;      notice, this list of conditions and the following disclaimer in the
15;;;      documentation and/or other materials provided with the distribution.
16;;;
17;;;   3. Neither the name of the authors nor the names of its contributors
18;;;      may be used to endorse or promote products derived from this
19;;;      software without specific prior written permission.
20;;;
21;;;   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22;;;   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23;;;   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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32;;;
33
34;; In Gauche, string bodies are immutable and we just use an extra
35;; indirection to realize mutable strings.  So it is trivial to
36;; implement size-changing mutation, but it doesn't give you
37;; any performance advantage---the cost of string-append! and string-replace!
38;; are the same as string-append and string-replace, respectively.
39;; We include srfi-118 for the portability.
40
41(define-module srfi-118
42  (use srfi-13)
43  (export string-append!
44          string-replace!))
45(select-module srfi-118)
46
47(define (string-append! string . vals)
48  ($ (with-module gauche.internal %string-replace-body!) string
49     (with-output-to-string
50       (^[]
51         (display string)
52         (for-each (^v (if (or (char? v) (string? v))
53                         (display v)
54                         (error "string-append! expects characters/strings in the arguments, but got:" v)))
55                   vals)))))
56
57(define (string-replace! dst dst-start dst-end src . args)
58  ($ (with-module gauche.internal %string-replace-body!) dst
59     (apply string-replace dst src dst-start dst-end args)))
60