214 lines
9.6 KiB
Scheme
214 lines
9.6 KiB
Scheme
;;; args-fold.scm - a program argument processor
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;;;
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;;; Copyright (c) 2002 Anthony Carrico
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;;;
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;;; All rights reserved.
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;;;
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;;; Redistribution and use in source and binary forms, with or without
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;;; modification, are permitted provided that the following conditions
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;;; are met:
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;;; 1. Redistributions of source code must retain the above copyright
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;;; notice, this list of conditions and the following disclaimer.
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;;; 2. Redistributions in binary form must reproduce the above copyright
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;;; notice, this list of conditions and the following disclaimer in the
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;;; documentation and/or other materials provided with the distribution.
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;;; 3. The name of the authors may not be used to endorse or promote products
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;;; derived from this software without specific prior written permission.
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;;;
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;;; THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
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;;; IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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;;; OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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;;; IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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;;; INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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;;; NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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;;; DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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;;; THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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;;; (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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;;; THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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(define option #f)
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(define option-names #f)
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(define option-required-arg? #f)
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(define option-optional-arg? #f)
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(define option-processor #f)
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(define option? #f)
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(let ()
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(define-record-type option-type
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($option names required-arg? optional-arg? processor)
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$option?
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(names $option-names)
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(required-arg? $option-required-arg?)
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(optional-arg? $option-optional-arg?)
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(processor $option-processor))
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(set! option $option)
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(set! option-names $option-names)
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(set! option-required-arg? $option-required-arg?)
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(set! option-optional-arg? $option-optional-arg?)
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(set! option-processor $option-processor)
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(set! option? $option?))
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(define args-fold
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(lambda (args
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options
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unrecognized-option-proc
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operand-proc
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. seeds)
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(letrec
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((find
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(lambda (l ?)
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(cond ((null? l) #f)
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((? (car l)) (car l))
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(else (find (cdr l) ?)))))
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(find-option
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;; ISSUE: This is a brute force search. Could use a table.
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(lambda (name)
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(find
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options
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(lambda (option)
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(find
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(option-names option)
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(lambda (test-name)
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(equal? name test-name)))))))
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(scan-short-options
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(lambda (index shorts args seeds)
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(if (= index (string-length shorts))
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(scan-args args seeds)
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(let* ((name (string-ref shorts index))
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(option (or (find-option name)
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(option (list name)
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#f
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#f
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unrecognized-option-proc))))
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(cond ((and (< (+ index 1) (string-length shorts))
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(or (option-required-arg? option)
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(option-optional-arg? option)))
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(let-values
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((seeds (apply (option-processor option)
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option
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name
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(substring
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shorts
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(+ index 1)
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(string-length shorts))
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seeds)))
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(scan-args args seeds)))
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((and (option-required-arg? option)
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(pair? args))
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(let-values
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((seeds (apply (option-processor option)
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option
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name
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(car args)
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seeds)))
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(scan-args (cdr args) seeds)))
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(else
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(let-values
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((seeds (apply (option-processor option)
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option
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name
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#f
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seeds)))
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(scan-short-options
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(+ index 1)
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shorts
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args
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seeds))))))))
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(scan-operands
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(lambda (operands seeds)
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(if (null? operands)
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(apply values seeds)
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(let-values ((seeds (apply operand-proc
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(car operands)
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seeds)))
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(scan-operands (cdr operands) seeds)))))
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(scan-args
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(lambda (args seeds)
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(if (null? args)
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(apply values seeds)
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(let ((arg (car args))
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(args (cdr args)))
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;; NOTE: This string matching code would be simpler
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;; using a regular expression matcher.
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(cond
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(;; (rx bos "--" eos)
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(string=? "--" arg)
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;; End option scanning:
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(scan-operands args seeds))
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(;;(rx bos
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;; "--"
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;; (submatch (+ (~ "=")))
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;; "="
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;; (submatch (* any)))
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(and (> (string-length arg) 4)
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(char=? #\- (string-ref arg 0))
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(char=? #\- (string-ref arg 1))
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(not (char=? #\= (string-ref arg 2)))
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(let loop ((index 3))
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(cond ((= index (string-length arg))
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#f)
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((char=? #\= (string-ref arg index))
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index)
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(else
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(loop (+ 1 index))))))
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;; Found long option with arg:
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=> (lambda (=-index)
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(let*-values
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(((name)
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(substring arg 2 =-index))
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((option-arg)
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(substring arg
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(+ =-index 1)
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(string-length arg)))
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((option)
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(or (find-option name)
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(option (list name)
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#t
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#f
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unrecognized-option-proc)))
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(seeds
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(apply (option-processor option)
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option
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name
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option-arg
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seeds)))
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(scan-args args seeds))))
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(;;(rx bos "--" (submatch (+ any)))
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(and (> (string-length arg) 3)
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(char=? #\- (string-ref arg 0))
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(char=? #\- (string-ref arg 1)))
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;; Found long option:
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(let* ((name (substring arg 2 (string-length arg)))
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(option (or (find-option name)
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(option
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(list name)
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#f
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#f
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unrecognized-option-proc))))
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(if (and (option-required-arg? option)
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(pair? args))
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(let-values
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((seeds (apply (option-processor option)
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option
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name
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(car args)
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seeds)))
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(scan-args (cdr args) seeds))
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(let-values
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((seeds (apply (option-processor option)
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option
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name
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#f
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seeds)))
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(scan-args args seeds)))))
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(;; (rx bos "-" (submatch (+ any)))
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(and (> (string-length arg) 1)
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(char=? #\- (string-ref arg 0)))
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;; Found short options
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(let ((shorts (substring arg 1 (string-length arg))))
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(scan-short-options 0 shorts args seeds)))
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(else
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(let-values ((seeds (apply operand-proc arg seeds)))
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(scan-args args seeds)))))))))
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(scan-args args seeds))))
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