1 ;;;; i18n.scm --- internationalization support -*- coding: utf-8 -*-
3 ;;;; Copyright (C) 2006, 2007, 2009, 2010, 2012 Free Software Foundation, Inc.
5 ;;;; This library is free software; you can redistribute it and/or
6 ;;;; modify it under the terms of the GNU Lesser General Public
7 ;;;; License as published by the Free Software Foundation; either
8 ;;;; version 3 of the License, or (at your option) any later version.
10 ;;;; This library is distributed in the hope that it will be useful,
11 ;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
12 ;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 ;;;; Lesser General Public License for more details.
15 ;;;; You should have received a copy of the GNU Lesser General Public
16 ;;;; License along with this library; if not, write to the Free Software
17 ;;;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 ;;; Author: Ludovic Courtès <ludo@gnu.org>
23 ;;; This module provides a number of routines that support
24 ;;; internationalization (e.g., locale-dependent text collation, character
25 ;;; mapping, etc.). It also defines `locale' objects, representing locale
26 ;;; settings, that may be passed around to most of these procedures.
31 (define-module (ice-9 i18n)
32 :use-module (ice-9 optargs)
33 :export (;; `locale' type
38 string-locale<? string-locale>?
39 string-locale-ci<? string-locale-ci>? string-locale-ci=?
41 char-locale<? char-locale>?
42 char-locale-ci<? char-locale-ci>? char-locale-ci=?
45 char-locale-downcase char-locale-upcase char-locale-titlecase
46 string-locale-downcase string-locale-upcase string-locale-titlecase
49 locale-string->integer locale-string->inexact
55 locale-day-short locale-day locale-month-short locale-month
58 locale-am-string locale-pm-string
59 locale-date+time-format locale-date-format locale-time-format
60 locale-time+am/pm-format
61 locale-era locale-era-year
62 locale-era-date-format locale-era-date+time-format
63 locale-era-time-format
66 locale-currency-symbol
67 locale-monetary-decimal-point locale-monetary-thousands-separator
68 locale-monetary-grouping locale-monetary-fractional-digits
69 locale-currency-symbol-precedes-positive?
70 locale-currency-symbol-precedes-negative?
71 locale-positive-separated-by-space?
72 locale-negative-separated-by-space?
73 locale-monetary-positive-sign locale-monetary-negative-sign
74 locale-positive-sign-position locale-negative-sign-position
75 monetary-amount->locale-string
78 locale-digit-grouping locale-decimal-point
79 locale-thousands-separator
83 locale-yes-regexp locale-no-regexp))
86 (eval-when (eval load compile)
87 (load-extension (string-append "libguile-" (effective-version))
95 (define (locale-encoding . locale)
96 (apply nl-langinfo CODESET locale))
103 ;; Helper macro: Define a procedure named NAME that maps its argument to
104 ;; NL-ITEMS. Gnulib guarantees that these items are available.
105 (define-macro (define-vector-langinfo-mapping name nl-items)
106 (let* ((item-count (length nl-items))
107 (defines `(define %nl-items (vector #f ,@nl-items)))
108 (make-body (lambda (result)
109 `(if (and (integer? item) (exact? item))
110 (if (and (>= item 1) (<= item ,item-count))
112 (throw 'out-of-range "out of range" item))
113 (throw 'wrong-type-arg "wrong argument type" item)))))
114 `(define (,name item . locale)
116 ,(make-body '(apply nl-langinfo (vector-ref %nl-items item) locale)))))
119 (define-vector-langinfo-mapping locale-day-short
120 (ABDAY_1 ABDAY_2 ABDAY_3 ABDAY_4 ABDAY_5 ABDAY_6 ABDAY_7))
122 (define-vector-langinfo-mapping locale-day
123 (DAY_1 DAY_2 DAY_3 DAY_4 DAY_5 DAY_6 DAY_7))
125 (define-vector-langinfo-mapping locale-month-short
126 (ABMON_1 ABMON_2 ABMON_3 ABMON_4 ABMON_5 ABMON_6
127 ABMON_7 ABMON_8 ABMON_9 ABMON_10 ABMON_11 ABMON_12))
129 (define-vector-langinfo-mapping locale-month
130 (MON_1 MON_2 MON_3 MON_4 MON_5 MON_6 MON_7 MON_8 MON_9 MON_10 MON_11 MON_12))
138 ;; Define a procedure NAME that gets langinfo item ITEM. Gnulib's
139 ;; `nl_langinfo' does not guarantee that all these items are supported
140 ;; (for instance, `GROUPING' is lacking on Darwin and Gnulib provides no
141 ;; replacement), so use DEFAULT as the default value when ITEM is not
143 (define-macro (define-simple-langinfo-mapping name item default)
144 (let ((body (if (defined? item)
145 `(apply nl-langinfo ,item locale)
147 `(define (,name . locale)
150 (define-simple-langinfo-mapping locale-am-string
152 (define-simple-langinfo-mapping locale-pm-string
154 (define-simple-langinfo-mapping locale-date+time-format
155 D_T_FMT "%a %b %e %H:%M:%S %Y")
156 (define-simple-langinfo-mapping locale-date-format
158 (define-simple-langinfo-mapping locale-time-format
160 (define-simple-langinfo-mapping locale-time+am/pm-format
161 T_FMT_AMPM "%I:%M:%S %p")
162 (define-simple-langinfo-mapping locale-era
164 (define-simple-langinfo-mapping locale-era-year
166 (define-simple-langinfo-mapping locale-era-date+time-format
168 (define-simple-langinfo-mapping locale-era-date-format
170 (define-simple-langinfo-mapping locale-era-time-format
176 ;;; Monetary information.
179 ;; Define a procedure NAME that gets item LOCAL-ITEM or INTL-ITEM,
180 ;; depending on whether the caller asked for the international version
181 ;; or not. Since Gnulib's `nl_langinfo' module doesn't guarantee that
182 ;; all these items are available, use DEFAULT/LOCAL and DEFAULT/INTL as
183 ;; default values when the system does not support them.
184 (define-macro (define-monetary-langinfo-mapping name local-item intl-item
185 default/local default/intl)
187 (let ((intl (if (defined? intl-item)
188 `(apply nl-langinfo ,intl-item locale)
190 (local (if (defined? local-item)
191 `(apply nl-langinfo ,local-item locale)
193 `(if intl? ,intl ,local))))
195 `(define (,name intl? . locale)
198 ;; FIXME: How can we use ALT_DIGITS?
199 (define-monetary-langinfo-mapping locale-currency-symbol
200 CRNCYSTR INT_CURR_SYMBOL
202 (define-monetary-langinfo-mapping locale-monetary-fractional-digits
203 FRAC_DIGITS INT_FRAC_DIGITS
206 (define-simple-langinfo-mapping locale-monetary-positive-sign
208 (define-simple-langinfo-mapping locale-monetary-negative-sign
210 (define-simple-langinfo-mapping locale-monetary-decimal-point
211 MON_DECIMAL_POINT "")
212 (define-simple-langinfo-mapping locale-monetary-thousands-separator
213 MON_THOUSANDS_SEP "")
214 (define-simple-langinfo-mapping locale-monetary-digit-grouping
217 (define-monetary-langinfo-mapping locale-currency-symbol-precedes-positive?
218 P_CS_PRECEDES INT_P_CS_PRECEDES
220 (define-monetary-langinfo-mapping locale-currency-symbol-precedes-negative?
221 N_CS_PRECEDES INT_N_CS_PRECEDES
225 (define-monetary-langinfo-mapping locale-positive-separated-by-space?
226 ;; Whether a space should be inserted between a positive amount and the
228 P_SEP_BY_SPACE INT_P_SEP_BY_SPACE
230 (define-monetary-langinfo-mapping locale-negative-separated-by-space?
231 ;; Whether a space should be inserted between a negative amount and the
233 N_SEP_BY_SPACE INT_N_SEP_BY_SPACE
236 (define-monetary-langinfo-mapping locale-positive-sign-position
237 ;; Position of the positive sign wrt. currency symbol and quantity in a
239 P_SIGN_POSN INT_P_SIGN_POSN
240 'unspecified 'unspecified)
241 (define-monetary-langinfo-mapping locale-negative-sign-position
242 ;; Position of the negative sign wrt. currency symbol and quantity in a
244 N_SIGN_POSN INT_N_SIGN_POSN
245 'unspecified 'unspecified)
248 (define (%number-integer-part int grouping separator)
249 ;; Process INT (a string denoting a number's integer part) and return a new
250 ;; string with digit grouping and separators according to GROUPING (a list,
251 ;; potentially circular) and SEPARATOR (a string).
253 ;; Process INT from right to left.
257 (cond ((string=? int "") (apply string-append result))
258 ((null? grouping) (apply string-append int result))
260 (let* ((len (string-length int))
261 (cut (min (car grouping) len)))
262 (loop (substring int 0 (- len cut))
264 (let ((sub (substring int (- len cut) len)))
266 (cons* separator sub result)
267 (cons sub result)))))))))
269 (define (add-monetary-sign+currency amount figure intl? locale)
270 ;; Add a sign and currency symbol around FIGURE. FIGURE should be a
271 ;; formatted unsigned amount (a string) representing AMOUNT.
272 (let* ((positive? (> amount 0))
274 (cond ((> amount 0) (locale-monetary-positive-sign locale))
275 ((< amount 0) (locale-monetary-negative-sign locale))
277 (currency (locale-currency-symbol intl? locale))
280 locale-currency-symbol-precedes-positive?
281 locale-currency-symbol-precedes-negative?))
284 locale-positive-separated-by-space?
285 locale-negative-separated-by-space?))
288 locale-positive-sign-position
289 locale-negative-sign-position))
291 (if (separated? intl? locale) " " ""))
294 (if (currency-precedes? intl? locale)
295 (string-append currency currency-space amt)
296 (string-append amt currency-space currency)))))
298 (case (sign-position intl? locale)
300 (string-append "(" (append-currency figure) ")"))
302 (string-append sign (append-currency figure)))
303 ((sign-after unspecified)
304 ;; following glibc's recommendation for `unspecified'.
305 (if (currency-precedes? intl? locale)
306 (string-append currency currency-space sign figure)
307 (string-append figure currency-space currency sign)))
308 ((sign-before-currency-symbol)
309 (if (currency-precedes? intl? locale)
310 (string-append sign currency currency-space figure)
311 (string-append figure currency-space sign currency))) ;; unlikely
312 ((sign-after-currency-symbol)
313 (if (currency-precedes? intl? locale)
314 (string-append currency sign currency-space figure)
315 (string-append figure currency-space currency sign)))
317 (error "unsupported sign position" (sign-position intl? locale))))))
320 (define* (monetary-amount->locale-string amount intl?
321 #:optional (locale %global-locale))
322 "Convert @var{amount} (an inexact) into a string according to the cultural
323 conventions of either @var{locale} (a locale object) or the current locale.
324 If @var{intl?} is true, then the international monetary format for the given
327 (let* ((fraction-digits
328 (or (locale-monetary-fractional-digits intl? locale) 2))
331 (if (or (string=? dec "") (eq? 0 fraction-digits))
333 (string-append (locale-monetary-decimal-point locale)
334 (if (< fraction-digits (string-length dec))
335 (substring dec 0 fraction-digits)
338 (external-repr (number->string (if (> amount 0) amount (- amount))))
339 (int+dec (string-split external-repr #\.))
341 (dec (decimal-part (if (null? (cdr int+dec))
344 (grouping (locale-monetary-digit-grouping locale))
345 (separator (locale-monetary-thousands-separator locale)))
347 (add-monetary-sign+currency amount
349 (%number-integer-part int grouping
357 ;;; Number formatting.
360 (define-simple-langinfo-mapping locale-digit-grouping
362 (define-simple-langinfo-mapping locale-decimal-point
364 (define-simple-langinfo-mapping locale-thousands-separator
367 (define* (number->locale-string number
368 #:optional (fraction-digits #t)
369 (locale %global-locale))
370 "Convert @var{number} (an inexact) into a string according to the cultural
371 conventions of either @var{locale} (a locale object) or the current locale.
372 Optionally, @var{fraction-digits} may be bound to an integer specifying the
373 number of fractional digits to be displayed."
376 (cond ((> number 0) "")
381 (if (or (string=? dec "") (eq? 0 fraction-digits))
383 (string-append (locale-decimal-point locale)
384 (if (and (integer? fraction-digits)
386 (string-length dec)))
387 (substring dec 0 fraction-digits)
390 (let* ((external-repr (number->string (if (> number 0)
393 (int+dec (string-split external-repr #\.))
395 (dec (decimal-part (if (null? (cdr int+dec))
398 (grouping (locale-digit-grouping locale))
399 (separator (locale-thousands-separator locale)))
402 (%number-integer-part int grouping separator)
410 (define-simple-langinfo-mapping locale-yes-regexp
412 (define-simple-langinfo-mapping locale-no-regexp
415 ;; `YESSTR' and `NOSTR' are considered deprecated so we don't provide them.
417 ;;; i18n.scm ends here