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;; -*-theme-d-*-
;; Copyright (C) 2019, 2022 Tommi Höynälänmaa
;; Distributed under GNU Lesser General Public License version 3,
;; see file doc/LGPL-3.
(define-body (standard-library command-line-parser)
(import (standard-library string-utilities)
(standard-library list-utilities))
(define-simple-proc raise1 (((s-kind <rte-exception-kind>)
(al-info <rte-exception-info>))
<none> (pure never-returns))
(raise (make-rte-exception s-kind al-info)))
(define-simple-proc handle-long-argument
(((l-argdescs <argument-descriptor-list>) (str <string>))
<none> nonpure)
(let* ((str-option (string-drop str 2))
(ich (string-char-index str-option #\=))
(str-actual-option
(if (= ich -1)
str-option
(string-take str-option ich)))
(str-option-arg
(if (not (= ich -1))
(string-drop str-option (+ ich 1))
""))
(argdesc
(find (lambda (((argdesc1 <argument-descriptor>)) <boolean> pure)
(match-type (field-ref argdesc1 'x-name)
((str-name <string>)
(equal-values? str-actual-option str-name))
(else #f)))
l-argdescs
null)))
(match-type argdesc
((<null>) (raise1 'unknown-command-line-argument
(list (cons 'str-arg str))))
((argdesc1 <argument-descriptor>)
(let ((takes-argument? (field-ref argdesc1 'takes-argument?))
(argument-present? (not (= ich -1))))
(cond
((and takes-argument? argument-present?)
(let ((proc (field-ref argdesc1 'proc-handler)))
(proc str-option-arg)))
((and (not takes-argument?) (not argument-present?))
(let ((proc (field-ref argdesc1 'proc-handler)))
(proc "")))
((and takes-argument? (not argument-present?))
(raise1 'required-argument-missing
(list (cons 'argdesc argdesc1))))
((and (not takes-argument?) argument-present?)
(raise1 'unwanted-argument
(list (cons 'argdesc argdesc1))))
(else
;; We should never enter here.
(raise-simple 'internal-error))))))))
(define-simple-proc handle-short-argument
(((l-argdescs <argument-descriptor-list>) (str <string>)
(i0 <integer>) (l-command-line (:uniform-list <string>)))
<integer> nonpure)
(if (<= (string-length str) 1)
(raise-simple 'command-line-syntax-error)
(let* ((ch-option (string-ref str 1))
(argdesc
(find (lambda (((argdesc1 <argument-descriptor>)) <boolean>
pure)
(match-type (field-ref argdesc1 'x-name)
((ch-name <character>)
(equal-values? ch-option ch-name))
(else #f)))
l-argdescs
null))
(i-cmd-len (length l-command-line)))
(match-type argdesc
((<null>)
(raise1 'unknown-command-line-argument
(list (cons 'str-arg str))))
((argdesc1 <argument-descriptor>)
(if (field-ref argdesc1 'takes-argument?)
(begin
(if (< (+ i0 1) i-cmd-len)
(let ((str-option-arg
(uniform-list-ref l-command-line (+ i0 1)))
(proc (field-ref argdesc1 'proc-handler)))
(proc str-option-arg))
(raise1 'missing-option-argument
(list (cons 'str-arg str))))
(+ i0 2))
(let ((proc (field-ref argdesc1 'proc-handler)))
(proc "")
(+ i0 1))))))))
(define-simple-method parse-command-line
(((l-command-line (:uniform-list <string>))
(l-argdescs <argument-descriptor-list>)
(proc-handle-proper-args
(:procedure ((:uniform-list <string>)) <none> nonpure)))
<none> nonpure)
(let ((i-cmd-len (length l-command-line)))
(let-mutable ((all-options-handled? <boolean> #f)
(i0 <integer> 0))
(until ((or (>= i0 i-cmd-len) all-options-handled?))
(let* ((str-cur (uniform-list-ref l-command-line i0))
(i-cur-len (string-length str-cur)))
(cond
((= i-cur-len 0) (raise-simple 'internal-error))
((equal-values? str-cur "--")
(set! all-options-handled? #t)
(set! i0 (+ i0 1)))
((and (> (string-length str-cur) 2)
(equal-values? (string-take str-cur 2) "--"))
(handle-long-argument l-argdescs str-cur)
(set! i0 (+ i0 1)))
((equal-values? (string-ref str-cur 0) #\-)
(set! i0
(handle-short-argument l-argdescs str-cur i0
l-command-line)))
(else
(set! all-options-handled? #t)))))
(let ((l-proper-args
(if all-options-handled?
(drop l-command-line i0)
null)))
(proc-handle-proper-args l-proper-args))))))
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