summaryrefslogtreecommitdiff
path: root/gnu/installer/locale.scm
blob: 2ec0598abb756fb5029cc21dd2c34e6ddb79a553 (about) (plain)
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
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2018 Mathieu Othacehe <m.othacehe@gmail.com>
;;; Copyright © 2019 Ludovic Courtès <ludo@gnu.org>
;;;
;;; 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 ((gnu build locale) #:select (normalize-codeset))
  #: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 #:optional codeset)
  "Return the locale association list built from the parsing of STRING and,
optionally, CODESET."
  (let ((matches (string-match locale-regexp string)))
    `((language  . ,(match:substring matches 1))
      (territory . ,(match:substring matches 3))
      (codeset   . ,(or 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
                   `("." ,(normalize-codeset codeset))
                   '())
             ,@(if modifier
                   `("@" ,modifier)
                   '())))))

(define (supported-locales->locales supported-locales)
  "Given SUPPORTED-LOCALES, a file produced by 'glibc-supported-locales',
return a list of locales where each locale is an alist."
  (filter-map (match-lambda
                (("C.UTF-8" . codeset) #f)
                ((locale . codeset)
                 (locale-string->locale locale codeset)))
       (call-with-input-file supported-locales read)))


;;;
;;; 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 (assoc-ref hash "alpha_2"))
                   (alpha3 (assoc-ref hash "alpha_3"))
                   (name   (assoc-ref hash "name")))
               (and (supported-locale? locales alpha2 alpha3)
                    `((alpha2 . ,alpha2)
                      (alpha3 . ,alpha3)
                      (name   . ,name)))))
           (append
            (vector->list
             (assoc-ref (json->scm port-iso639-3) "639-3"))
            (vector->list
             (assoc-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 . ,(assoc-ref hash "alpha_2"))
               (alpha3 . ,(assoc-ref hash "alpha_3"))
               (name   . ,(assoc-ref hash "name"))))
           (vector->list
            (assoc-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)))