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9d774814 GH |
1 | ;;; installed-scm-file |
2 | ||
6d36532c | 3 | ;;;; Copyright (C) 1997, 1999, 2000, 2001 Free Software Foundation, Inc. |
9d774814 GH |
4 | ;;;; |
5 | ;;;; This program is free software; you can redistribute it and/or modify | |
6 | ;;;; it under the terms of the GNU General Public License as published by | |
7 | ;;;; the Free Software Foundation; either version 2, or (at your option) | |
8 | ;;;; any later version. | |
9 | ;;;; | |
10 | ;;;; This program is distributed in the hope that it will be useful, | |
11 | ;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | ;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | ;;;; GNU General Public License for more details. | |
14 | ;;;; | |
15 | ;;;; You should have received a copy of the GNU General Public License | |
16 | ;;;; along with this software; see the file COPYING. If not, write to | |
17 | ;;;; the Free Software Foundation, Inc., 59 Temple Place, Suite 330, | |
18 | ;;;; Boston, MA 02111-1307 USA | |
19 | ;;;; | |
20 | \f | |
21 | ||
6d36532c GH |
22 | ;;; This is the Scheme part of the module for delimited I/O. It's |
23 | ;;; similar to (scsh rdelim) but somewhat incompatible. | |
9d774814 GH |
24 | |
25 | (define-module (ice-9 rdelim)) | |
26 | ||
43fd4402 MV |
27 | (%init-rdelim-builtins) |
28 | ||
9d774814 | 29 | (export read-line read-line! read-delimited read-delimited!) |
6d36532c | 30 | (export %read-delimited! %read-line write-line) ; C |
9d774814 GH |
31 | |
32 | (define (read-line! string . maybe-port) | |
33 | ;; corresponds to SCM_LINE_INCREMENTORS in libguile. | |
34 | (define scm-line-incrementors "\n") | |
35 | ||
36 | (let* ((port (if (pair? maybe-port) | |
37 | (car maybe-port) | |
38 | (current-input-port)))) | |
39 | (let* ((rv (%read-delimited! scm-line-incrementors | |
40 | string | |
41 | #t | |
42 | port)) | |
43 | (terminator (car rv)) | |
44 | (nchars (cdr rv))) | |
45 | (cond ((and (= nchars 0) | |
46 | (eof-object? terminator)) | |
47 | terminator) | |
48 | ((not terminator) #f) | |
49 | (else nchars))))) | |
50 | ||
51 | (define (read-delimited! delims buf . args) | |
52 | (let* ((num-args (length args)) | |
53 | (port (if (> num-args 0) | |
54 | (car args) | |
55 | (current-input-port))) | |
56 | (handle-delim (if (> num-args 1) | |
57 | (cadr args) | |
58 | 'trim)) | |
59 | (start (if (> num-args 2) | |
60 | (caddr args) | |
61 | 0)) | |
62 | (end (if (> num-args 3) | |
63 | (cadddr args) | |
64 | (string-length buf)))) | |
65 | (let* ((rv (%read-delimited! delims | |
66 | buf | |
67 | (not (eq? handle-delim 'peek)) | |
68 | port | |
69 | start | |
70 | end)) | |
71 | (terminator (car rv)) | |
72 | (nchars (cdr rv))) | |
73 | (cond ((or (not terminator) ; buffer filled | |
74 | (eof-object? terminator)) | |
75 | (if (zero? nchars) | |
76 | (if (eq? handle-delim 'split) | |
77 | (cons terminator terminator) | |
78 | terminator) | |
79 | (if (eq? handle-delim 'split) | |
80 | (cons nchars terminator) | |
81 | nchars))) | |
82 | (else | |
83 | (case handle-delim | |
84 | ((trim peek) nchars) | |
85 | ((concat) (string-set! buf (+ nchars start) terminator) | |
86 | (+ nchars 1)) | |
87 | ((split) (cons nchars terminator)) | |
88 | (else (error "unexpected handle-delim value: " | |
89 | handle-delim)))))))) | |
90 | ||
91 | (define (read-delimited delims . args) | |
92 | (let* ((port (if (pair? args) | |
93 | (let ((pt (car args))) | |
94 | (set! args (cdr args)) | |
95 | pt) | |
96 | (current-input-port))) | |
97 | (handle-delim (if (pair? args) | |
98 | (car args) | |
99 | 'trim))) | |
bf4aaed2 | 100 | (let loop ((substrings '()) |
9d774814 GH |
101 | (total-chars 0) |
102 | (buf-size 100)) ; doubled each time through. | |
103 | (let* ((buf (make-string buf-size)) | |
104 | (rv (%read-delimited! delims | |
105 | buf | |
106 | (not (eq? handle-delim 'peek)) | |
107 | port)) | |
108 | (terminator (car rv)) | |
109 | (nchars (cdr rv)) | |
110 | (join-substrings | |
111 | (lambda () | |
112 | (apply string-append | |
113 | (reverse | |
114 | (cons (if (and (eq? handle-delim 'concat) | |
115 | (not (eof-object? terminator))) | |
116 | (string terminator) | |
117 | "") | |
118 | (cons (substring buf 0 nchars) | |
119 | substrings)))))) | |
120 | (new-total (+ total-chars nchars))) | |
121 | (cond ((not terminator) | |
122 | ;; buffer filled. | |
123 | (loop (cons (substring buf 0 nchars) substrings) | |
124 | new-total | |
125 | (* buf-size 2))) | |
126 | ((eof-object? terminator) | |
127 | (if (zero? new-total) | |
128 | (if (eq? handle-delim 'split) | |
129 | (cons terminator terminator) | |
130 | terminator) | |
131 | (if (eq? handle-delim 'split) | |
132 | (cons (join-substrings) terminator) | |
133 | (join-substrings)))) | |
134 | (else | |
135 | (case handle-delim | |
136 | ((trim peek concat) (join-substrings)) | |
137 | ((split) (cons (join-substrings) terminator)) | |
138 | ||
139 | ||
140 | (else (error "unexpected handle-delim value: " | |
141 | handle-delim))))))))) | |
142 | ||
143 | ;;; read-line [PORT [HANDLE-DELIM]] reads a newline-terminated string | |
144 | ;;; from PORT. The return value depends on the value of HANDLE-DELIM, | |
145 | ;;; which may be one of the symbols `trim', `concat', `peek' and | |
146 | ;;; `split'. If it is `trim' (the default), the trailing newline is | |
147 | ;;; removed and the string is returned. If `concat', the string is | |
148 | ;;; returned with the trailing newline intact. If `peek', the newline | |
149 | ;;; is left in the input port buffer and the string is returned. If | |
150 | ;;; `split', the newline is split from the string and read-line | |
151 | ;;; returns a pair consisting of the truncated string and the newline. | |
152 | ||
153 | (define (read-line . args) | |
154 | (let* ((port (if (null? args) | |
155 | (current-input-port) | |
156 | (car args))) | |
157 | (handle-delim (if (> (length args) 1) | |
158 | (cadr args) | |
159 | 'trim)) | |
160 | (line/delim (%read-line port)) | |
161 | (line (car line/delim)) | |
162 | (delim (cdr line/delim))) | |
163 | (case handle-delim | |
164 | ((trim) line) | |
165 | ((split) line/delim) | |
166 | ((concat) (if (and (string? line) (char? delim)) | |
167 | (string-append line (string delim)) | |
168 | line)) | |
169 | ((peek) (if (char? delim) | |
170 | (unread-char delim port)) | |
171 | line) | |
172 | (else | |
173 | (error "unexpected handle-delim value: " handle-delim))))) |