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Diffstat (limited to 'gnu/installer/locale.scm')
| -rw-r--r-- | gnu/installer/locale.scm | 210 |
1 files changed, 210 insertions, 0 deletions
diff --git a/gnu/installer/locale.scm b/gnu/installer/locale.scm new file mode 100644 index 0000000000..2b45b2200a --- /dev/null +++ b/gnu/installer/locale.scm @@ -0,0 +1,210 @@ +;;; GNU Guix --- Functional package management for GNU +;;; Copyright © 2018 Mathieu Othacehe <m.othacehe@gmail.com> +;;; +;;; This file is part of GNU Guix. +;;; +;;; GNU Guix is free software; you can redistribute it and/or modify it +;;; under the terms of the GNU General Public License as published by +;;; the Free Software Foundation; either version 3 of the License, or (at +;;; your option) any later version. +;;; +;;; GNU Guix is distributed in the hope that it will be useful, but +;;; WITHOUT ANY WARRANTY; without even the implied warranty of +;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +;;; GNU General Public License for more details. +;;; +;;; You should have received a copy of the GNU General Public License +;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>. + +(define-module (gnu installer locale) + #:use-module (gnu installer utils) + #:use-module (guix records) + #:use-module (json) + #:use-module (srfi srfi-1) + #:use-module (ice-9 match) + #:use-module (ice-9 regex) + #:export (locale-language + locale-territory + locale-codeset + locale-modifier + + locale->locale-string + supported-locales->locales + + iso639->iso639-languages + language-code->language-name + + iso3166->iso3166-territories + territory-code->territory-name + + locale->configuration)) + + +;;; +;;; Locale. +;;; + +;; A glibc locale string has the following format: +;; language[_territory[.codeset][@modifier]]. +(define locale-regexp "^([^_@]+)(_([^\\.@]+))?(\\.([^@]+))?(@([^$]+))?$") + +;; LOCALE will be better expressed in a (guix record) that in an association +;; list. However, loading large files containing records does not scale +;; well. The same thing goes for ISO639 and ISO3166 association lists used +;; later in this module. +(define (locale-language assoc) + (assoc-ref assoc 'language)) +(define (locale-territory assoc) + (assoc-ref assoc 'territory)) +(define (locale-codeset assoc) + (assoc-ref assoc 'codeset)) +(define (locale-modifier assoc) + (assoc-ref assoc 'modifier)) + +(define (locale-string->locale string) + "Return the locale association list built from the parsing of STRING." + (let ((matches (string-match locale-regexp string))) + `((language . ,(match:substring matches 1)) + (territory . ,(match:substring matches 3)) + (codeset . ,(match:substring matches 5)) + (modifier . ,(match:substring matches 7))))) + +(define (locale->locale-string locale) + "Reverse operation of locale-string->locale." + (let ((language (locale-language locale)) + (territory (locale-territory locale)) + (codeset (locale-codeset locale)) + (modifier (locale-modifier locale))) + (apply string-append + `(,language + ,@(if territory + `("_" ,territory) + '()) + ,@(if codeset + `("." ,codeset) + '()) + ,@(if modifier + `("@" ,modifier) + '()))))) + +(define (supported-locales->locales supported-locales) + "Parse the SUPPORTED-LOCALES file from the glibc and return the matching +list of LOCALE association lists." + (call-with-input-file supported-locales + (lambda (port) + (let ((lines (read-lines port))) + (map (lambda (line) + (match (string-split line #\ ) + ((locale-string codeset) + (let ((line-locale (locale-string->locale locale-string))) + (assoc-set! line-locale 'codeset codeset))))) + lines))))) + + +;;; +;;; Language. +;;; + +(define (iso639-language-alpha2 assoc) + (assoc-ref assoc 'alpha2)) + +(define (iso639-language-alpha3 assoc) + (assoc-ref assoc 'alpha3)) + +(define (iso639-language-name assoc) + (assoc-ref assoc 'name)) + +(define (supported-locale? locales alpha2 alpha3) + "Find a locale in LOCALES whose alpha2 field matches ALPHA-2 or alpha3 field +matches ALPHA-3. The ISO639 standard specifies that ALPHA-2 is optional. Thus, +if ALPHA-2 is #f, only consider ALPHA-3. Return #f if not matching locale was +found." + (find (lambda (locale) + (let ((language (locale-language locale))) + (or (and=> alpha2 + (lambda (code) + (string=? language code))) + (string=? language alpha3)))) + locales)) + +(define (iso639->iso639-languages locales iso639-3 iso639-5) + "Return a list of ISO639 association lists created from the parsing of +ISO639-3 and ISO639-5 files." + (call-with-input-file iso639-3 + (lambda (port-iso639-3) + (call-with-input-file iso639-5 + (lambda (port-iso639-5) + (filter-map + (lambda (hash) + (let ((alpha2 (hash-ref hash "alpha_2")) + (alpha3 (hash-ref hash "alpha_3")) + (name (hash-ref hash "name"))) + (and (supported-locale? locales alpha2 alpha3) + `((alpha2 . ,alpha2) + (alpha3 . ,alpha3) + (name . ,name))))) + (append + (hash-ref (json->scm port-iso639-3) "639-3") + (hash-ref (json->scm port-iso639-5) "639-5")))))))) + +(define (language-code->language-name languages language-code) + "Using LANGUAGES as a list of ISO639 association lists, return the language +name corresponding to the given LANGUAGE-CODE." + (let ((iso639-language + (find (lambda (language) + (or + (and=> (iso639-language-alpha2 language) + (lambda (alpha2) + (string=? alpha2 language-code))) + (string=? (iso639-language-alpha3 language) + language-code))) + languages))) + (iso639-language-name iso639-language))) + + +;;; +;;; Territory. +;;; + +(define (iso3166-territory-alpha2 assoc) + (assoc-ref assoc 'alpha2)) + +(define (iso3166-territory-alpha3 assoc) + (assoc-ref assoc 'alpha3)) + +(define (iso3166-territory-name assoc) + (assoc-ref assoc 'name)) + +(define (iso3166->iso3166-territories iso3166) + "Return a list of ISO3166 association lists created from the parsing of +ISO3166 file." + (call-with-input-file iso3166 + (lambda (port) + (map (lambda (hash) + `((alpha2 . ,(hash-ref hash "alpha_2")) + (alpha3 . ,(hash-ref hash "alpha_3")) + (name . ,(hash-ref hash "name")))) + (hash-ref (json->scm port) "3166-1"))))) + +(define (territory-code->territory-name territories territory-code) + "Using TERRITORIES as a list of ISO3166 association lists return the +territory name corresponding to the given TERRITORY-CODE." + (let ((iso3166-territory + (find (lambda (territory) + (or + (and=> (iso3166-territory-alpha2 territory) + (lambda (alpha2) + (string=? alpha2 territory-code))) + (string=? (iso3166-territory-alpha3 territory) + territory-code))) + territories))) + (iso3166-territory-name iso3166-territory))) + + +;;; +;;; Configuration formatter. +;;; + +(define (locale->configuration locale) + "Return the configuration field for LOCALE." + `((locale ,locale))) |