summaryrefslogtreecommitdiffstats
path: root/js/src/builtin/Intl.h
blob: 5384d9be1178bffe55cc52926c06415cdc6933fd (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
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
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef builtin_Intl_h
#define builtin_Intl_h

#include "mozilla/HashFunctions.h"
#include "mozilla/MemoryReporting.h"

#include "jsalloc.h"
#include "NamespaceImports.h"

#include "js/GCAPI.h"
#include "js/GCHashTable.h"

#include "unicode/utypes.h"

/*
 * The Intl module specified by standard ECMA-402,
 * ECMAScript Internationalization API Specification.
 */

namespace js {

/**
 * Initializes the Intl Object and its standard built-in properties.
 * Spec: ECMAScript Internationalization API Specification, 8.0, 8.1
 */
extern JSObject*
InitIntlClass(JSContext* cx, HandleObject obj);

/**
 * Stores Intl data which can be shared across compartments (but not contexts).
 *
 * Used for data which is expensive when computed repeatedly or is not
 * available through ICU.
 */
class SharedIntlData
{
    /**
     * Information tracking the set of the supported time zone names, derived
     * from the IANA time zone database <https://www.iana.org/time-zones>.
     *
     * There are two kinds of IANA time zone names: Zone and Link (denoted as
     * such in database source files). Zone names are the canonical, preferred
     * name for a time zone, e.g. Asia/Kolkata. Link names simply refer to
     * target Zone names for their meaning, e.g. Asia/Calcutta targets
     * Asia/Kolkata. That a name is a Link doesn't *necessarily* reflect a
     * sense of deprecation: some Link names also exist partly for convenience,
     * e.g. UTC and GMT as Link names targeting the Zone name Etc/UTC.
     *
     * Two data sources determine the time zone names we support: those ICU
     * supports and IANA's zone information.
     *
     * Unfortunately the names ICU and IANA support, and their Link
     * relationships from name to target, aren't identical, so we can't simply
     * implicitly trust ICU's name handling. We must perform various
     * preprocessing of user-provided zone names and post-processing of
     * ICU-provided zone names to implement ECMA-402's IANA-consistent behavior.
     *
     * Also see <https://ssl.icu-project.org/trac/ticket/12044> and
     * <http://unicode.org/cldr/trac/ticket/9892>.
     */

    using TimeZoneName = JSAtom*;

    struct TimeZoneHasher
    {
        struct Lookup
        {
            union {
                const JS::Latin1Char* latin1Chars;
                const char16_t* twoByteChars;
            };
            bool isLatin1;
            size_t length;
            JS::AutoCheckCannotGC nogc;
            HashNumber hash;

            explicit Lookup(JSFlatString* timeZone);
        };

        static js::HashNumber hash(const Lookup& lookup) { return lookup.hash; }
        static bool match(TimeZoneName key, const Lookup& lookup);
    };

    using TimeZoneSet = js::GCHashSet<TimeZoneName,
                                      TimeZoneHasher,
                                      js::SystemAllocPolicy>;

    using TimeZoneMap = js::GCHashMap<TimeZoneName,
                                      TimeZoneName,
                                      TimeZoneHasher,
                                      js::SystemAllocPolicy>;

    /**
     * As a threshold matter, available time zones are those time zones ICU
     * supports, via ucal_openTimeZones. But ICU supports additional non-IANA
     * time zones described in intl/icu/source/tools/tzcode/icuzones (listed in
     * IntlTimeZoneData.cpp's |legacyICUTimeZones|) for its own backwards
     * compatibility purposes. This set consists of ICU's supported time zones,
     * minus all backwards-compatibility time zones.
     */
    TimeZoneSet availableTimeZones;

    /**
     * IANA treats some time zone names as Zones, that ICU instead treats as
     * Links. For example, IANA considers "America/Indiana/Indianapolis" to be
     * a Zone and "America/Fort_Wayne" a Link that targets it, but ICU
     * considers the former a Link that targets "America/Indianapolis" (which
     * IANA treats as a Link).
     *
     * ECMA-402 requires that we respect IANA data, so if we're asked to
     * canonicalize a time zone name in this set, we must *not* return ICU's
     * canonicalization.
     */
    TimeZoneSet ianaZonesTreatedAsLinksByICU;

    /**
     * IANA treats some time zone names as Links to one target, that ICU
     * instead treats as either Zones, or Links to different targets. An
     * example of the former is "Asia/Calcutta, which IANA assigns the target
     * "Asia/Kolkata" but ICU considers its own Zone. An example of the latter
     * is "America/Virgin", which IANA assigns the target
     * "America/Port_of_Spain" but ICU assigns the target "America/St_Thomas".
     *
     * ECMA-402 requires that we respect IANA data, so if we're asked to
     * canonicalize a time zone name that's a key in this map, we *must* return
     * the corresponding value and *must not* return ICU's canonicalization.
     */
    TimeZoneMap ianaLinksCanonicalizedDifferentlyByICU;

    bool timeZoneDataInitialized = false;

    /**
     * Precomputes the available time zone names, because it's too expensive to
     * call ucal_openTimeZones() repeatedly.
     */
    bool ensureTimeZones(JSContext* cx);

  public:
    /**
     * Returns the validated time zone name in |result|. If the input time zone
     * isn't a valid IANA time zone name, |result| remains unchanged.
     */
    bool validateTimeZoneName(JSContext* cx, JS::HandleString timeZone,
                              JS::MutableHandleString result);

    /**
     * Returns the canonical time zone name in |result|. If no canonical name
     * was found, |result| remains unchanged.
     *
     * This method only handles time zones which are canonicalized differently
     * by ICU when compared to IANA.
     */
    bool tryCanonicalizeTimeZoneConsistentWithIANA(JSContext* cx, JS::HandleString timeZone,
                                                   JS::MutableHandleString result);

    void destroyInstance();

    void trace(JSTracer* trc);

    size_t sizeOfExcludingThis(mozilla::MallocSizeOf mallocSizeOf) const;
};

/*
 * The following functions are for use by self-hosted code.
 */


/******************** Collator ********************/

/**
 * Returns a new instance of the standard built-in Collator constructor.
 * Self-hosted code cannot cache this constructor (as it does for others in
 * Utilities.js) because it is initialized after self-hosted code is compiled.
 *
 * Usage: collator = intl_Collator(locales, options)
 */
extern MOZ_MUST_USE bool
intl_Collator(JSContext* cx, unsigned argc, Value* vp);

/**
 * Returns an object indicating the supported locales for collation
 * by having a true-valued property for each such locale with the
 * canonicalized language tag as the property name. The object has no
 * prototype.
 *
 * Usage: availableLocales = intl_Collator_availableLocales()
 */
extern MOZ_MUST_USE bool
intl_Collator_availableLocales(JSContext* cx, unsigned argc, Value* vp);

/**
 * Returns an array with the collation type identifiers per Unicode
 * Technical Standard 35, Unicode Locale Data Markup Language, for the
 * collations supported for the given locale. "standard" and "search" are
 * excluded.
 *
 * Usage: collations = intl_availableCollations(locale)
 */
extern MOZ_MUST_USE bool
intl_availableCollations(JSContext* cx, unsigned argc, Value* vp);

/**
 * Compares x and y (which must be String values), and returns a number less
 * than 0 if x < y, 0 if x = y, or a number greater than 0 if x > y according
 * to the sort order for the locale and collation options of the given
 * Collator.
 *
 * Spec: ECMAScript Internationalization API Specification, 10.3.2.
 *
 * Usage: result = intl_CompareStrings(collator, x, y)
 */
extern MOZ_MUST_USE bool
intl_CompareStrings(JSContext* cx, unsigned argc, Value* vp);


/******************** NumberFormat ********************/

/**
 * Returns a new instance of the standard built-in NumberFormat constructor.
 * Self-hosted code cannot cache this constructor (as it does for others in
 * Utilities.js) because it is initialized after self-hosted code is compiled.
 *
 * Usage: numberFormat = intl_NumberFormat(locales, options)
 */
extern MOZ_MUST_USE bool
intl_NumberFormat(JSContext* cx, unsigned argc, Value* vp);

/**
 * Returns an object indicating the supported locales for number formatting
 * by having a true-valued property for each such locale with the
 * canonicalized language tag as the property name. The object has no
 * prototype.
 *
 * Usage: availableLocales = intl_NumberFormat_availableLocales()
 */
extern MOZ_MUST_USE bool
intl_NumberFormat_availableLocales(JSContext* cx, unsigned argc, Value* vp);

/**
 * Returns the numbering system type identifier per Unicode
 * Technical Standard 35, Unicode Locale Data Markup Language, for the
 * default numbering system for the given locale.
 *
 * Usage: defaultNumberingSystem = intl_numberingSystem(locale)
 */
extern MOZ_MUST_USE bool
intl_numberingSystem(JSContext* cx, unsigned argc, Value* vp);

/**
 * Returns a string representing the number x according to the effective
 * locale and the formatting options of the given NumberFormat.
 *
 * Spec: ECMAScript Internationalization API Specification, 11.3.2.
 *
 * Usage: formatted = intl_FormatNumber(numberFormat, x)
 */
extern MOZ_MUST_USE bool
intl_FormatNumber(JSContext* cx, unsigned argc, Value* vp);


/******************** DateTimeFormat ********************/

/**
 * Returns a new instance of the standard built-in DateTimeFormat constructor.
 * Self-hosted code cannot cache this constructor (as it does for others in
 * Utilities.js) because it is initialized after self-hosted code is compiled.
 *
 * Usage: dateTimeFormat = intl_DateTimeFormat(locales, options)
 */
extern MOZ_MUST_USE bool
intl_DateTimeFormat(JSContext* cx, unsigned argc, Value* vp);

/**
 * Returns an object indicating the supported locales for date and time
 * formatting by having a true-valued property for each such locale with the
 * canonicalized language tag as the property name. The object has no
 * prototype.
 *
 * Usage: availableLocales = intl_DateTimeFormat_availableLocales()
 */
extern MOZ_MUST_USE bool
intl_DateTimeFormat_availableLocales(JSContext* cx, unsigned argc, Value* vp);

/**
 * Returns an array with the calendar type identifiers per Unicode
 * Technical Standard 35, Unicode Locale Data Markup Language, for the
 * supported calendars for the given locale. The default calendar is
 * element 0.
 *
 * Usage: calendars = intl_availableCalendars(locale)
 */
extern MOZ_MUST_USE bool
intl_availableCalendars(JSContext* cx, unsigned argc, Value* vp);

/**
 * 6.4.1 IsValidTimeZoneName ( timeZone )
 *
 * Verifies that the given string is a valid time zone name. If it is a valid
 * time zone name, its IANA time zone name is returned. Otherwise returns null.
 *
 * ES2017 Intl draft rev 4a23f407336d382ed5e3471200c690c9b020b5f3
 *
 * Usage: ianaTimeZone = intl_IsValidTimeZoneName(timeZone)
 */
extern MOZ_MUST_USE bool
intl_IsValidTimeZoneName(JSContext* cx, unsigned argc, Value* vp);

/**
 * Return the canonicalized time zone name. Canonicalization resolves link
 * names to their target time zones.
 *
 * Usage: ianaTimeZone = intl_canonicalizeTimeZone(timeZone)
 */
extern MOZ_MUST_USE bool
intl_canonicalizeTimeZone(JSContext* cx, unsigned argc, Value* vp);

/**
 * Return the default time zone name. The time zone name is not canonicalized.
 *
 * Usage: icuDefaultTimeZone = intl_defaultTimeZone()
 */
extern MOZ_MUST_USE bool
intl_defaultTimeZone(JSContext* cx, unsigned argc, Value* vp);

/**
 * Return the raw offset from GMT in milliseconds for the default time zone.
 *
 * Usage: defaultTimeZoneOffset = intl_defaultTimeZoneOffset()
 */
extern MOZ_MUST_USE bool
intl_defaultTimeZoneOffset(JSContext* cx, unsigned argc, Value* vp);

/**
 * Return a pattern in the date-time format pattern language of Unicode
 * Technical Standard 35, Unicode Locale Data Markup Language, for the
 * best-fit date-time format pattern corresponding to skeleton for the
 * given locale.
 *
 * Usage: pattern = intl_patternForSkeleton(locale, skeleton)
 */
extern MOZ_MUST_USE bool
intl_patternForSkeleton(JSContext* cx, unsigned argc, Value* vp);

/**
 * Returns a String value representing x (which must be a Number value)
 * according to the effective locale and the formatting options of the
 * given DateTimeFormat.
 *
 * Spec: ECMAScript Internationalization API Specification, 12.3.2.
 *
 * Usage: formatted = intl_FormatDateTime(dateTimeFormat, x)
 */
extern MOZ_MUST_USE bool
intl_FormatDateTime(JSContext* cx, unsigned argc, Value* vp);

/**
 * Returns a plain object with calendar information for a single valid locale
 * (callers must perform this validation).  The object will have these
 * properties:
 *
 *   firstDayOfWeek
 *     an integer in the range 1=Sunday to 7=Saturday indicating the day
 *     considered the first day of the week in calendars, e.g. 1 for en-US,
 *     2 for en-GB, 1 for bn-IN
 *   minDays
 *     an integer in the range of 1 to 7 indicating the minimum number
 *     of days required in the first week of the year, e.g. 1 for en-US, 4 for de
 *   weekendStart
 *     an integer in the range 1=Sunday to 7=Saturday indicating the day
 *     considered the beginning of a weekend, e.g. 7 for en-US, 7 for en-GB,
 *     1 for bn-IN
 *   weekendEnd
 *     an integer in the range 1=Sunday to 7=Saturday indicating the day
 *     considered the end of a weekend, e.g. 1 for en-US, 1 for en-GB,
 *     1 for bn-IN (note that "weekend" is *not* necessarily two days)
 *
 * NOTE: "calendar" and "locale" properties are *not* added to the object.
 */
extern MOZ_MUST_USE bool
intl_GetCalendarInfo(JSContext* cx, unsigned argc, Value* vp);

/**
 * Returns an Array with CLDR-based fields display names.
 * The function takes three arguments:
 *
 *   locale
 *     BCP47 compliant locale string
 *   style
 *     A string with values: long or short or narrow
 *   keys
 *     An array or path-like strings that identify keys to be returned
 *     At the moment the following types of keys are supported:
 *
 *       'dates/fields/{year|month|week|day}'
 *       'dates/gregorian/months/{january|...|december}'
 *       'dates/gregorian/weekdays/{sunday|...|saturday}'
 *       'dates/gregorian/dayperiods/{am|pm}'
 *
 * Example:
 *
 * let info = intl_ComputeDisplayNames(
 *   'en-US',
 *   'long',
 *   [
 *     'dates/fields/year',
 *     'dates/gregorian/months/january',
 *     'dates/gregorian/weekdays/monday',
 *     'dates/gregorian/dayperiods/am',
 *   ]
 * );
 *
 * Returned value:
 *
 * [
 *   'year',
 *   'January',
 *   'Monday',
 *   'AM'
 * ]
 */
extern MOZ_MUST_USE bool
intl_ComputeDisplayNames(JSContext* cx, unsigned argc, Value* vp);

/**
 * Cast char16_t* strings to UChar* strings used by ICU.
 */
inline const UChar*
Char16ToUChar(const char16_t* chars)
{
  return reinterpret_cast<const UChar*>(chars);
}

inline UChar*
Char16ToUChar(char16_t* chars)
{
  return reinterpret_cast<UChar*>(chars);
}

inline char16_t*
UCharToChar16(UChar* chars)
{
  return reinterpret_cast<char16_t*>(chars);
}

inline const char16_t*
UCharToChar16(const UChar* chars)
{
  return reinterpret_cast<const char16_t*>(chars);
}

} // namespace js

#endif /* builtin_Intl_h */