/usr/share/scsh-0.6/srfi/srfi-37.scm is in scsh-common-0.6 0.6.7-8.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 | ;;; args-fold.scm - a program argument processor
;;;
;;; Copyright (c) 2002 Anthony Carrico
;;;
;;; All rights reserved.
;;;
;;; 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. The name of the authors may not be used to endorse or promote products
;;; derived from this software without specific prior written permission.
;;;
;;; THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``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 AUTHORS 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.
(define option #f)
(define option-names #f)
(define option-required-arg? #f)
(define option-optional-arg? #f)
(define option-processor #f)
(define option? #f)
(let ()
(define-record-type option-type
($option names required-arg? optional-arg? processor)
$option?
(names $option-names)
(required-arg? $option-required-arg?)
(optional-arg? $option-optional-arg?)
(processor $option-processor))
(set! option $option)
(set! option-names $option-names)
(set! option-required-arg? $option-required-arg?)
(set! option-optional-arg? $option-optional-arg?)
(set! option-processor $option-processor)
(set! option? $option?))
(define args-fold
(lambda (args
options
unrecognized-option-proc
operand-proc
. seeds)
(letrec
((find
(lambda (l ?)
(cond ((null? l) #f)
((? (car l)) (car l))
(else (find (cdr l) ?)))))
(find-option
;; ISSUE: This is a brute force search. Could use a table.
(lambda (name)
(find
options
(lambda (option)
(find
(option-names option)
(lambda (test-name)
(equal? name test-name)))))))
(scan-short-options
(lambda (index shorts args seeds)
(if (= index (string-length shorts))
(scan-args args seeds)
(let* ((name (string-ref shorts index))
(option (or (find-option name)
(option (list name)
#f
#f
unrecognized-option-proc))))
(cond ((and (< (+ index 1) (string-length shorts))
(or (option-required-arg? option)
(option-optional-arg? option)))
(let-values
((seeds (apply (option-processor option)
option
name
(substring
shorts
(+ index 1)
(string-length shorts))
seeds)))
(scan-args args seeds)))
((and (option-required-arg? option)
(pair? args))
(let-values
((seeds (apply (option-processor option)
option
name
(car args)
seeds)))
(scan-args (cdr args) seeds)))
(else
(let-values
((seeds (apply (option-processor option)
option
name
#f
seeds)))
(scan-short-options
(+ index 1)
shorts
args
seeds))))))))
(scan-operands
(lambda (operands seeds)
(if (null? operands)
(apply values seeds)
(let-values ((seeds (apply operand-proc
(car operands)
seeds)))
(scan-operands (cdr operands) seeds)))))
(scan-args
(lambda (args seeds)
(if (null? args)
(apply values seeds)
(let ((arg (car args))
(args (cdr args)))
;; NOTE: This string matching code would be simpler
;; using a regular expression matcher.
(cond
(;; (rx bos "--" eos)
(string=? "--" arg)
;; End option scanning:
(scan-operands args seeds))
(;;(rx bos
;; "--"
;; (submatch (+ (~ "=")))
;; "="
;; (submatch (* any)))
(and (> (string-length arg) 4)
(char=? #\- (string-ref arg 0))
(char=? #\- (string-ref arg 1))
(not (char=? #\= (string-ref arg 2)))
(let loop ((index 3))
(cond ((= index (string-length arg))
#f)
((char=? #\= (string-ref arg index))
index)
(else
(loop (+ 1 index))))))
;; Found long option with arg:
=> (lambda (=-index)
(let*-values
(((name)
(substring arg 2 =-index))
((option-arg)
(substring arg
(+ =-index 1)
(string-length arg)))
((option)
(or (find-option name)
(option (list name)
#t
#f
unrecognized-option-proc)))
(seeds
(apply (option-processor option)
option
name
option-arg
seeds)))
(scan-args args seeds))))
(;;(rx bos "--" (submatch (+ any)))
(and (> (string-length arg) 3)
(char=? #\- (string-ref arg 0))
(char=? #\- (string-ref arg 1)))
;; Found long option:
(let* ((name (substring arg 2 (string-length arg)))
(option (or (find-option name)
(option
(list name)
#f
#f
unrecognized-option-proc))))
(if (and (option-required-arg? option)
(pair? args))
(let-values
((seeds (apply (option-processor option)
option
name
(car args)
seeds)))
(scan-args (cdr args) seeds))
(let-values
((seeds (apply (option-processor option)
option
name
#f
seeds)))
(scan-args args seeds)))))
(;; (rx bos "-" (submatch (+ any)))
(and (> (string-length arg) 1)
(char=? #\- (string-ref arg 0)))
;; Found short options
(let ((shorts (substring arg 1 (string-length arg))))
(scan-short-options 0 shorts args seeds)))
(else
(let-values ((seeds (apply operand-proc arg seeds)))
(scan-args args seeds)))))))))
(scan-args args seeds))))
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