File size: 21,002 Bytes
3dcad1f |
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 |
;;;; i18n.scm --- internationalization support -*- coding: utf-8 -*-
;;;; Copyright (C) 2006, 2007, 2009, 2010, 2012,
;;;; 2017, 2019 Free Software Foundation, Inc.
;;;;
;;;; This library is free software; you can redistribute it and/or
;;;; modify it under the terms of the GNU Lesser General Public
;;;; License as published by the Free Software Foundation; either
;;;; version 3 of the License, or (at your option) any later version.
;;;;
;;;; This library 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
;;;; Lesser General Public License for more details.
;;;;
;;;; You should have received a copy of the GNU Lesser General Public
;;;; License along with this library; if not, write to the Free Software
;;;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
;;; Author: Ludovic Courtès <[email protected]>
;;; Commentary:
;;;
;;; This module provides a number of routines that support
;;; internationalization (e.g., locale-dependent text collation, character
;;; mapping, etc.). It also defines `locale' objects, representing locale
;;; settings, that may be passed around to most of these procedures.
;;;
;;; Code:
(define-module (ice-9 i18n)
:use-module (ice-9 optargs)
:export (;; `locale' type
make-locale locale?
%global-locale
;; text collation
string-locale<? string-locale>?
string-locale-ci<? string-locale-ci>? string-locale-ci=?
char-locale<? char-locale>?
char-locale-ci<? char-locale-ci>? char-locale-ci=?
;; character mapping
char-locale-downcase char-locale-upcase char-locale-titlecase
string-locale-downcase string-locale-upcase string-locale-titlecase
;; reading numbers
locale-string->integer locale-string->inexact
;; charset/encoding
locale-encoding
;; days and months
locale-day-short locale-day locale-month-short locale-month
;; date and time
locale-am-string locale-pm-string
locale-date+time-format locale-date-format locale-time-format
locale-time+am/pm-format
locale-era locale-era-year
locale-era-date-format locale-era-date+time-format
locale-era-time-format
;; monetary
locale-currency-symbol
locale-monetary-decimal-point locale-monetary-thousands-separator
locale-monetary-grouping locale-monetary-fractional-digits
locale-currency-symbol-precedes-positive?
locale-currency-symbol-precedes-negative?
locale-positive-separated-by-space?
locale-negative-separated-by-space?
locale-monetary-positive-sign locale-monetary-negative-sign
locale-positive-sign-position locale-negative-sign-position
monetary-amount->locale-string
;; number formatting
locale-digit-grouping locale-decimal-point
locale-thousands-separator
number->locale-string
;; miscellaneous
locale-yes-regexp locale-no-regexp
;; debugging
%locale-dump))
(eval-when (expand load eval)
(load-extension (string-append "libguile-" (effective-version))
"scm_init_i18n"))
;;;
;;; Charset/encoding.
;;;
(define (locale-encoding . locale)
(apply nl-langinfo CODESET locale))
;;;
;;; Months and days.
;;;
;; Helper macro: Define a procedure named NAME that maps its argument to
;; NL-ITEMS. Gnulib guarantees that these items are available.
(define-macro (define-vector-langinfo-mapping name nl-items)
(let* ((item-count (length nl-items))
(defines `(define %nl-items (vector #f ,@nl-items)))
(make-body (lambda (result)
`(if (and (integer? item) (exact? item))
(if (and (>= item 1) (<= item ,item-count))
,result
(throw 'out-of-range "out of range" item))
(throw 'wrong-type-arg "wrong argument type" item)))))
`(define (,name item . locale)
,defines
,(make-body '(apply nl-langinfo (vector-ref %nl-items item) locale)))))
(define-vector-langinfo-mapping locale-day-short
(ABDAY_1 ABDAY_2 ABDAY_3 ABDAY_4 ABDAY_5 ABDAY_6 ABDAY_7))
(define-vector-langinfo-mapping locale-day
(DAY_1 DAY_2 DAY_3 DAY_4 DAY_5 DAY_6 DAY_7))
(define-vector-langinfo-mapping locale-month-short
(ABMON_1 ABMON_2 ABMON_3 ABMON_4 ABMON_5 ABMON_6
ABMON_7 ABMON_8 ABMON_9 ABMON_10 ABMON_11 ABMON_12))
(define-vector-langinfo-mapping locale-month
(MON_1 MON_2 MON_3 MON_4 MON_5 MON_6 MON_7 MON_8 MON_9 MON_10 MON_11 MON_12))
;;;
;;; Date and time.
;;;
;; Define a procedure NAME that gets langinfo item ITEM. Gnulib's
;; `nl_langinfo' does not guarantee that all these items are supported
;; (for instance, `GROUPING' is lacking on Darwin and Gnulib provides no
;; replacement), so use DEFAULT as the default value when ITEM is not
;; available.
(define-macro (define-simple-langinfo-mapping name item default)
(let ((body (if (defined? item)
`(apply nl-langinfo ,item locale)
default)))
`(define (,name . locale)
,body)))
(define-simple-langinfo-mapping locale-am-string
AM_STR "AM")
(define-simple-langinfo-mapping locale-pm-string
PM_STR "PM")
(define-simple-langinfo-mapping locale-date+time-format
D_T_FMT "%a %b %e %H:%M:%S %Y")
(define-simple-langinfo-mapping locale-date-format
D_FMT "%m/%d/%y")
(define-simple-langinfo-mapping locale-time-format
T_FMT "%H:%M:%S")
(define-simple-langinfo-mapping locale-time+am/pm-format
T_FMT_AMPM "%I:%M:%S %p")
(define-simple-langinfo-mapping locale-era
ERA "")
(define-simple-langinfo-mapping locale-era-year
ERA_YEAR "")
(define-simple-langinfo-mapping locale-era-date+time-format
ERA_D_T_FMT "")
(define-simple-langinfo-mapping locale-era-date-format
ERA_D_FMT "")
(define-simple-langinfo-mapping locale-era-time-format
ERA_T_FMT "")
;;;
;;; Monetary information.
;;;
;; Define a procedure NAME that gets item LOCAL-ITEM or INTL-ITEM,
;; depending on whether the caller asked for the international version
;; or not. Since Gnulib's `nl_langinfo' module doesn't guarantee that
;; all these items are available, use DEFAULT/LOCAL and DEFAULT/INTL as
;; default values when the system does not support them.
(define-macro (define-monetary-langinfo-mapping name local-item intl-item
default/local default/intl)
(let ((body
(let ((intl (if (defined? intl-item)
`(apply nl-langinfo ,intl-item locale)
default/intl))
(local (if (defined? local-item)
`(apply nl-langinfo ,local-item locale)
default/local)))
`(if intl? ,intl ,local))))
`(define (,name intl? . locale)
,body)))
;; FIXME: How can we use ALT_DIGITS?
(define-monetary-langinfo-mapping locale-currency-symbol
CRNCYSTR INT_CURR_SYMBOL
"-" "")
(define-monetary-langinfo-mapping locale-monetary-fractional-digits
FRAC_DIGITS INT_FRAC_DIGITS
2 2)
(define-simple-langinfo-mapping locale-monetary-positive-sign
POSITIVE_SIGN "+")
(define-simple-langinfo-mapping locale-monetary-negative-sign
NEGATIVE_SIGN "-")
(define-simple-langinfo-mapping locale-monetary-decimal-point
MON_DECIMAL_POINT ".")
(define-simple-langinfo-mapping locale-monetary-thousands-separator
MON_THOUSANDS_SEP "")
(define-simple-langinfo-mapping locale-monetary-grouping
MON_GROUPING '())
(define-monetary-langinfo-mapping locale-currency-symbol-precedes-positive?
P_CS_PRECEDES INT_P_CS_PRECEDES
#t #t)
(define-monetary-langinfo-mapping locale-currency-symbol-precedes-negative?
N_CS_PRECEDES INT_N_CS_PRECEDES
#t #t)
(define-monetary-langinfo-mapping locale-positive-separated-by-space?
;; Whether a space should be inserted between a positive amount and the
;; currency symbol.
P_SEP_BY_SPACE INT_P_SEP_BY_SPACE
#t #t)
(define-monetary-langinfo-mapping locale-negative-separated-by-space?
;; Whether a space should be inserted between a negative amount and the
;; currency symbol.
N_SEP_BY_SPACE INT_N_SEP_BY_SPACE
#t #t)
(define-monetary-langinfo-mapping locale-positive-sign-position
;; Position of the positive sign wrt. currency symbol and quantity in a
;; monetary amount.
P_SIGN_POSN INT_P_SIGN_POSN
'unspecified 'unspecified)
(define-monetary-langinfo-mapping locale-negative-sign-position
;; Position of the negative sign wrt. currency symbol and quantity in a
;; monetary amount.
N_SIGN_POSN INT_N_SIGN_POSN
'unspecified 'unspecified)
(define (integer->string number)
"Return a string representing NUMBER, an integer, written in base 10."
(define (digit->char digit)
(integer->char (+ digit (char->integer #\0))))
(if (zero? number)
"0"
(let loop ((number number)
(digits '()))
(if (zero? number)
(list->string digits)
(loop (quotient number 10)
(cons (digit->char (modulo number 10))
digits))))))
(define (number-decimal-string number digit-count)
"Return a string representing the decimal part of NUMBER. When
DIGIT-COUNT is an integer, return exactly DIGIT-COUNT digits; when
DIGIT-COUNT is #t, return as many decimals as necessary, up to an
arbitrary limit."
(define max-decimals
5)
;; XXX: This is brute-force and could be improved by following one of
;; the "Printing Floating-Point Numbers Quickly and Accurately"
;; papers.
(if (integer? digit-count)
(let ((number (* (expt 10 digit-count)
(- number (floor number)))))
(string-pad (integer->string (round (inexact->exact number)))
digit-count
#\0))
(let loop ((decimals 0))
(let ((number' (* number (expt 10 decimals))))
(if (or (= number' (floor number'))
(>= decimals max-decimals))
(let* ((fraction (- number'
(* (floor number)
(expt 10 decimals))))
(str (integer->string
(round (inexact->exact fraction)))))
(if (zero? fraction)
""
str))
(loop (+ decimals 1)))))))
(define (%number-integer-part int grouping separator)
;; Process INT (a string denoting a number's integer part) and return a new
;; string with digit grouping and separators according to GROUPING (a list,
;; potentially circular) and SEPARATOR (a string).
;; Process INT from right to left.
(let loop ((int int)
(grouping grouping)
(result '()))
(cond ((string=? int "") (apply string-append result))
((null? grouping) (apply string-append int result))
(else
(let* ((len (string-length int))
(cut (min (car grouping) len)))
(loop (substring int 0 (- len cut))
(cdr grouping)
(let ((sub (substring int (- len cut) len)))
(if (> len cut)
(cons* separator sub result)
(cons sub result)))))))))
(define (add-monetary-sign+currency amount figure intl? locale)
;; Add a sign and currency symbol around FIGURE. FIGURE should be a
;; formatted unsigned amount (a string) representing AMOUNT.
(let* ((positive? (> amount 0))
(sign
(cond ((> amount 0) (locale-monetary-positive-sign locale))
((< amount 0) (locale-monetary-negative-sign locale))
(else "")))
(currency (locale-currency-symbol intl? locale))
(currency-precedes?
(if positive?
locale-currency-symbol-precedes-positive?
locale-currency-symbol-precedes-negative?))
(separated?
(if positive?
locale-positive-separated-by-space?
locale-negative-separated-by-space?))
(sign-position
(if positive?
locale-positive-sign-position
locale-negative-sign-position))
(currency-space
(if (separated? intl? locale) " " ""))
(append-currency
(lambda (amt)
(if (currency-precedes? intl? locale)
(string-append currency currency-space amt)
(string-append amt currency-space currency)))))
(case (sign-position intl? locale)
((parenthesize)
(string-append "(" (append-currency figure) ")"))
((sign-before)
(string-append sign (append-currency figure)))
((sign-after unspecified)
;; following glibc's recommendation for `unspecified'.
(if (currency-precedes? intl? locale)
(string-append currency currency-space sign figure)
(string-append figure currency-space currency sign)))
((sign-before-currency-symbol)
(if (currency-precedes? intl? locale)
(string-append sign currency currency-space figure)
(string-append figure currency-space sign currency))) ;; unlikely
((sign-after-currency-symbol)
(if (currency-precedes? intl? locale)
(string-append currency sign currency-space figure)
(string-append figure currency-space currency sign)))
(else
(error "unsupported sign position" (sign-position intl? locale))))))
(define* (monetary-amount->locale-string amount intl?
#:optional (locale %global-locale))
"Convert @var{amount} (an inexact) into a string according to the cultural
conventions of either @var{locale} (a locale object) or the current locale.
If @var{intl?} is true, then the international monetary format for the given
locale is used."
(let* ((fraction-digits
(or (locale-monetary-fractional-digits intl? locale) 2))
(decimal-part
(lambda (dec)
(if (or (string=? dec "") (eq? 0 fraction-digits))
""
(string-append (locale-monetary-decimal-point locale)
(if (< fraction-digits (string-length dec))
(substring dec 0 fraction-digits)
dec)))))
(int (integer->string (inexact->exact
(floor (abs amount)))))
(dec (decimal-part
(number-decimal-string (abs amount)
fraction-digits)))
(grouping (locale-monetary-grouping locale))
(separator (locale-monetary-thousands-separator locale)))
(add-monetary-sign+currency amount
(string-append
(%number-integer-part int grouping
separator)
dec)
intl? locale)))
;;;
;;; Number formatting.
;;;
(define-simple-langinfo-mapping locale-digit-grouping
GROUPING '())
(define-simple-langinfo-mapping locale-decimal-point
RADIXCHAR ".")
(define-simple-langinfo-mapping locale-thousands-separator
THOUSEP "")
(define* (number->locale-string number
#:optional (fraction-digits #t)
(locale %global-locale))
"Convert @var{number} (an inexact) into a string according to the cultural
conventions of either @var{locale} (a locale object) or the current locale.
By default, print as many fractional digits as necessary, up to an upper bound.
Optionally, @var{fraction-digits} may be bound to an integer specifying the
number of fractional digits to be displayed."
(let* ((sign
(cond ((> number 0) "")
((< number 0) "-")
(else "")))
(decimal-part
(lambda (dec)
(if (or (string=? dec "") (eq? 0 fraction-digits))
""
(string-append (locale-decimal-point locale)
(if (and (integer? fraction-digits)
(< fraction-digits
(string-length dec)))
(substring dec 0 fraction-digits)
dec))))))
(let* ((int (integer->string (inexact->exact
(floor (abs number)))))
(dec (decimal-part
(number-decimal-string (abs number)
fraction-digits)))
(grouping (locale-digit-grouping locale))
(separator (locale-thousands-separator locale)))
(string-append sign
(%number-integer-part int grouping separator)
dec))))
;;;
;;; Miscellaneous.
;;;
(define-simple-langinfo-mapping locale-yes-regexp
YESEXPR "^[yY]")
(define-simple-langinfo-mapping locale-no-regexp
NOEXPR "^[nN]")
;; `YESSTR' and `NOSTR' are considered deprecated so we don't provide them.
;;;
;;; Debugging
;;;
(define (%locale-dump loc)
"Given a locale, display an association list containing all the locale
information.
This procedure is intended for debugging locale problems, and should
not be used in production code."
(when (locale? loc)
(list
(cons 'encoding (locale-encoding loc))
(cons 'day-short
(map (lambda (n) (locale-day-short (1+ n) loc)) (iota 7)))
(cons 'day
(map (lambda (n) (locale-day (1+ n) loc)) (iota 7)))
(cons 'month-short
(map (lambda (n) (locale-month-short (1+ n) loc)) (iota 12)))
(cons 'month
(map (lambda (n) (locale-month (1+ n) loc)) (iota 12)))
(cons 'am-string (locale-am-string loc))
(cons 'pm-string (locale-pm-string loc))
(cons 'date+time-format (locale-date+time-format loc))
(cons 'date-format (locale-date-format loc))
(cons 'time-format (locale-time-format loc))
(cons 'time+am/pm-format (locale-time+am/pm-format loc))
(cons 'era (locale-era loc))
(cons 'era-year (locale-era-year loc))
(cons 'era-date-format (locale-era-date-format loc))
(cons 'era-date+time-format (locale-era-date+time-format loc))
(cons 'era-time-format (locale-era-time-format loc))
(cons 'currency-symbol
(list (locale-currency-symbol #t loc)
(locale-currency-symbol #f loc)))
(cons 'monetary-decimal-point (locale-monetary-decimal-point loc))
(cons 'monetary-thousands-separator (locale-monetary-thousands-separator loc))
(cons 'monetary-grouping (locale-monetary-grouping loc))
(cons 'monetary-fractional-digits
(list (locale-monetary-fractional-digits #t loc)
(locale-monetary-fractional-digits #f loc)))
(cons 'currency-symbol-precedes-positive?
(list (locale-currency-symbol-precedes-positive? #t loc)
(locale-currency-symbol-precedes-positive? #f loc)))
(cons 'currency-symbol-precedes-negative?
(list (locale-currency-symbol-precedes-negative? #t loc)
(locale-currency-symbol-precedes-negative? #f loc)))
(cons 'positive-separated-by-space?
(list (locale-positive-separated-by-space? #t loc)
(locale-positive-separated-by-space? #f loc)))
(cons 'negative-separated-by-space?
(list (locale-negative-separated-by-space? #t loc)
(locale-negative-separated-by-space? #f loc)))
(cons 'monetary-positive-sign (locale-monetary-positive-sign loc))
(cons 'monetary-negative-sign (locale-monetary-negative-sign loc))
(cons 'positive-sign-position
(list (locale-positive-sign-position #t loc)
(locale-negative-sign-position #f loc)))
(cons 'negative-sign-position
(list (locale-negative-sign-position #t loc)
(locale-negative-sign-position #f loc)))
(cons 'digit-grouping (locale-digit-grouping loc))
(cons 'decimal-point (locale-decimal-point loc))
(cons 'thousands-separator (locale-thousands-separator loc))
(cons 'locale-yes-regexp (locale-yes-regexp loc))
(cons 'no-regexp (locale-no-regexp loc)))))
;;; i18n.scm ends here
|