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 24;;; A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 25;;; OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 26;;; SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED 27;;; TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 28;;; PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 29;;; LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 30;;; NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 31;;; SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 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