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Re: verify ISSN (issn-verify.el)
From: |
황병희 |
Subject: |
Re: verify ISSN (issn-verify.el) |
Date: |
Fri, 11 Sep 2020 13:58:03 +0900 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/26.3 (gnu/linux) |
Emanuel Berg via "Emacs development discussions." <emacs-devel@gnu.org>
writes:
> ;;; issn-verify.el --- verify ISSN -*- lexical-binding: t
> ;;
> ;;; Commentary:
> ;;
> ;; This Elisp package provides functions to verify
> ;; ISSN by computing their check digits.
> ;;
> ;; Author: Emanuel Berg (incal) <moasenwood@zoho.eu>
> ;; Created: 2020-09-06
> ;; Keywords: bib, tex
> ;; License: GPL3+
> ;; Package-Requires: ((cl-lib "1.0"))
> ;; URL: https://dataswamp.org/~incal/emacs-init/issn-verify.el
> ;; Version: 1.0.0
> ;;
> ;; Also see:
> ;;
> ;; https://dataswamp.org/~incal/emacs-init/isbn-verify.el
> ;;
> ;; To install this package, with this file in
> ;; a buffer, do:
> ;;
> ;; M-x load-file RET RET
> ;;
> ;; International Standard Serial Number:
> ;;
> ;; ISO 3297, 1975
> ;;
> ;; format:
> ;;
> ;; The Ring Magazine: ISSN 0035-5410
> ;; d_1d_2d_3d_4-d_5d_6d_7c
> ;; d_i for i \in [1, 7] is an integer
> ;; c, the check digit, is 0..9 or X for 10
> ;;
> ;; compute check digit c:
> ;;
> ;; c' = 8d_1*7d_2*6d_3*5d_4*4d_5*3d_6*2d_7 mod 11
> ;;
> ;; { 0 c' = 0
> ;; c = {
> ;; { 11 - c' else
> ;;
> ;;; Code:
>
> (require 'cl-lib)
>
> (defun issn--get-digits (issn)
> (when (string-match "[[:digit:]]\\{4\\}-[[:digit:]]\\{3\\}[X[:digit:]]"
> issn)
> (let*((hyphen-pos 4)
> (issn-lst (string-to-list issn)) )
> (mapcar (lambda (c) (if (eq ?X c) "X" (- c ?0)))
> (append (cl-subseq issn-lst 0 hyphen-pos)
> (cl-subseq issn-lst (1+ hyphen-pos)) )))))
>
> (defun issn-verify-issn (issn)
> (let*((issn-lst (issn--get-digits issn))
> (c-prop (car (last issn-lst)))
> (c-w 0) )
> (cl-loop for d in issn-lst
> for w downfrom 8 to 2
> do (cl-incf c-w (* w d)) )
> (let*((c-prime (mod c-w 11))
> (c (cond ((= c-prime 0) 0)
> (t (- 11 c-prime) )))
> (c-x (if (= 10 c) "X" c)) )
> (if (equal c-prop c-x)
> (message "%s (OK)" c-x)
> (message "NOT OK! is %s, should be %s" c-prop c-x) ))))
>
> ;; Bicycle Quarterly (issn-verify-issn "1941-8809")
> ;; Bicycling (issn-verify-issn "1651-9744")
> ;; Black Belt (issn-verify-issn "0277-3066")
> ;; Filter (issn-verify-issn "1654-9813")
> ;; Linux Pro (issn-verify-issn "1471-5678")
> ;; National Geographic (issn-verify-issn "2535-4124")
> ;; Outside (issn-verify-issn "0278-1433")
> ;; The Ring (issn-verify-issn "0035-5410")
>
> ;; The Economist (issn-verify-issn "0013-0614") ; NOT OK! is 4, should
> be 3
>
> (provide 'issn-verify)
> ;;; issn-verify.el ends here
Still i don't know emacs lisp but your codes looks beautiful, wow!!!
Cheer up and thanks Emanuel^^^
Sincerely, Byung-Hee
--
^고맙습니다 _和合團結_ 감사합니다_^))//