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
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
|
// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.
/*
* notes: by srl295
* - When in NODE_HAVE_SMALL_ICU mode, ICU is linked against "stub" (null) data
* ( stubdata/libicudata.a ) containing nothing, no data, and it's also
* linked against a "small" data file which the SMALL_ICUDATA_ENTRY_POINT
* macro names. That's the "english+root" data.
*
* If icu_data_path is non-null, the user has provided a path and we assume
* it goes somewhere useful. We set that path in ICU, and exit.
* If icu_data_path is null, they haven't set a path and we want the
* "english+root" data. We call
* udata_setCommonData(SMALL_ICUDATA_ENTRY_POINT,...)
* to load up the english+root data.
*
* - when NOT in NODE_HAVE_SMALL_ICU mode, ICU is linked directly with its full
* data. All of the variables and command line options for changing data at
* runtime are disabled, as they wouldn't fully override the internal data.
* See: http://bugs.icu-project.org/trac/ticket/10924
*/
#include "node_i18n.h"
#if defined(NODE_HAVE_I18N_SUPPORT)
#include "node.h"
#include "node_buffer.h"
#include "env-inl.h"
#include "util-inl.h"
#include "base-object-inl.h"
#include "v8.h"
#include <unicode/utypes.h>
#include <unicode/putil.h>
#include <unicode/uchar.h>
#include <unicode/uclean.h>
#include <unicode/udata.h>
#include <unicode/uidna.h>
#include <unicode/ucnv.h>
#include <unicode/utf8.h>
#include <unicode/utf16.h>
#include <unicode/timezone.h>
#include <unicode/ulocdata.h>
#include <unicode/uvernum.h>
#include <unicode/uversion.h>
#include <unicode/ustring.h>
#ifdef NODE_HAVE_SMALL_ICU
/* if this is defined, we have a 'secondary' entry point.
compare following to utypes.h defs for U_ICUDATA_ENTRY_POINT */
#define SMALL_ICUDATA_ENTRY_POINT \
SMALL_DEF2(U_ICU_VERSION_MAJOR_NUM, U_LIB_SUFFIX_C_NAME)
#define SMALL_DEF2(major, suff) SMALL_DEF(major, suff)
#ifndef U_LIB_SUFFIX_C_NAME
#define SMALL_DEF(major, suff) icusmdt##major##_dat
#else
#define SMALL_DEF(major, suff) icusmdt##suff##major##_dat
#endif
extern "C" const char U_DATA_API SMALL_ICUDATA_ENTRY_POINT[];
#endif
namespace node {
using v8::Context;
using v8::FunctionCallbackInfo;
using v8::HandleScope;
using v8::Isolate;
using v8::Local;
using v8::MaybeLocal;
using v8::Object;
using v8::ObjectTemplate;
using v8::String;
using v8::Value;
namespace i18n {
namespace {
template <typename T>
MaybeLocal<Object> ToBufferEndian(Environment* env, MaybeStackBuffer<T>* buf) {
MaybeLocal<Object> ret = Buffer::New(env, buf);
if (ret.IsEmpty())
return ret;
static_assert(sizeof(T) == 1 || sizeof(T) == 2,
"Currently only one- or two-byte buffers are supported");
if (sizeof(T) > 1 && IsBigEndian()) {
SPREAD_BUFFER_ARG(ret.ToLocalChecked(), retbuf);
SwapBytes16(retbuf_data, retbuf_length);
}
return ret;
}
struct Converter {
explicit Converter(const char* name, const char* sub = NULL)
: conv(nullptr) {
UErrorCode status = U_ZERO_ERROR;
conv = ucnv_open(name, &status);
CHECK(U_SUCCESS(status));
if (sub != NULL) {
ucnv_setSubstChars(conv, sub, strlen(sub), &status);
}
}
explicit Converter(UConverter* converter,
const char* sub = NULL) : conv(converter) {
CHECK_NE(conv, nullptr);
UErrorCode status = U_ZERO_ERROR;
if (sub != NULL) {
ucnv_setSubstChars(conv, sub, strlen(sub), &status);
}
}
~Converter() {
ucnv_close(conv);
}
UConverter* conv;
};
class ConverterObject : public BaseObject, Converter {
public:
enum ConverterFlags {
CONVERTER_FLAGS_FLUSH = 0x1,
CONVERTER_FLAGS_FATAL = 0x2,
CONVERTER_FLAGS_IGNORE_BOM = 0x4
};
~ConverterObject() override {}
static void Has(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
HandleScope scope(env->isolate());
CHECK_GE(args.Length(), 1);
Utf8Value label(env->isolate(), args[0]);
UErrorCode status = U_ZERO_ERROR;
UConverter* conv = ucnv_open(*label, &status);
args.GetReturnValue().Set(!!U_SUCCESS(status));
ucnv_close(conv);
}
static void Create(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
HandleScope scope(env->isolate());
CHECK_GE(args.Length(), 2);
Utf8Value label(env->isolate(), args[0]);
int flags = args[1]->Uint32Value(env->context()).ToChecked();
bool fatal =
(flags & CONVERTER_FLAGS_FATAL) == CONVERTER_FLAGS_FATAL;
bool ignoreBOM =
(flags & CONVERTER_FLAGS_IGNORE_BOM) == CONVERTER_FLAGS_IGNORE_BOM;
UErrorCode status = U_ZERO_ERROR;
UConverter* conv = ucnv_open(*label, &status);
if (U_FAILURE(status))
return;
if (fatal) {
status = U_ZERO_ERROR;
ucnv_setToUCallBack(conv, UCNV_TO_U_CALLBACK_STOP,
nullptr, nullptr, nullptr, &status);
}
Local<ObjectTemplate> t = ObjectTemplate::New(env->isolate());
t->SetInternalFieldCount(1);
Local<Object> obj = t->NewInstance(env->context()).ToLocalChecked();
new ConverterObject(env, obj, conv, ignoreBOM);
args.GetReturnValue().Set(obj);
}
static void Decode(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
CHECK_GE(args.Length(), 3); // Converter, Buffer, Flags
Converter utf8("utf8");
ConverterObject* converter;
ASSIGN_OR_RETURN_UNWRAP(&converter, args[0].As<Object>());
SPREAD_BUFFER_ARG(args[1], input_obj);
int flags = args[2]->Uint32Value(env->context()).ToChecked();
UErrorCode status = U_ZERO_ERROR;
MaybeStackBuffer<UChar> result;
MaybeLocal<Object> ret;
size_t limit = ucnv_getMinCharSize(converter->conv) *
input_obj_length;
if (limit > 0)
result.AllocateSufficientStorage(limit);
UBool flush = (flags & CONVERTER_FLAGS_FLUSH) == CONVERTER_FLAGS_FLUSH;
const char* source = input_obj_data;
size_t source_length = input_obj_length;
if (converter->unicode_ && !converter->ignoreBOM_ && !converter->bomSeen_) {
int32_t bomOffset = 0;
ucnv_detectUnicodeSignature(source, source_length, &bomOffset, &status);
source += bomOffset;
source_length -= bomOffset;
converter->bomSeen_ = true;
}
UChar* target = *result;
ucnv_toUnicode(converter->conv,
&target, target + (limit * sizeof(UChar)),
&source, source + source_length,
NULL, flush, &status);
if (U_SUCCESS(status)) {
if (limit > 0)
result.SetLength(target - &result[0]);
ret = ToBufferEndian(env, &result);
args.GetReturnValue().Set(ret.ToLocalChecked());
goto reset;
}
args.GetReturnValue().Set(status);
reset:
if (flush) {
// Reset the converter state
converter->bomSeen_ = false;
ucnv_reset(converter->conv);
}
}
protected:
ConverterObject(Environment* env,
v8::Local<v8::Object> wrap,
UConverter* converter,
bool ignoreBOM,
const char* sub = NULL) :
BaseObject(env, wrap),
Converter(converter, sub),
ignoreBOM_(ignoreBOM) {
MakeWeak<ConverterObject>(this);
switch (ucnv_getType(converter)) {
case UCNV_UTF8:
case UCNV_UTF16_BigEndian:
case UCNV_UTF16_LittleEndian:
unicode_ = true;
break;
default:
unicode_ = false;
}
}
private:
bool unicode_ = false; // True if this is a Unicode converter
bool ignoreBOM_ = false; // True if the BOM should be ignored on Unicode
bool bomSeen_ = false; // True if the BOM has been seen
};
// One-Shot Converters
void CopySourceBuffer(MaybeStackBuffer<UChar>* dest,
const char* data,
const size_t length,
const size_t length_in_chars) {
dest->AllocateSufficientStorage(length_in_chars);
char* dst = reinterpret_cast<char*>(**dest);
memcpy(dst, data, length);
if (IsBigEndian()) {
SwapBytes16(dst, length);
}
}
typedef MaybeLocal<Object> (*TranscodeFunc)(Environment* env,
const char* fromEncoding,
const char* toEncoding,
const char* source,
const size_t source_length,
UErrorCode* status);
MaybeLocal<Object> Transcode(Environment* env,
const char* fromEncoding,
const char* toEncoding,
const char* source,
const size_t source_length,
UErrorCode* status) {
*status = U_ZERO_ERROR;
MaybeLocal<Object> ret;
MaybeStackBuffer<char> result;
Converter to(toEncoding, "?");
Converter from(fromEncoding);
const uint32_t limit = source_length * ucnv_getMaxCharSize(to.conv);
result.AllocateSufficientStorage(limit);
char* target = *result;
ucnv_convertEx(to.conv, from.conv, &target, target + limit,
&source, source + source_length, nullptr, nullptr,
nullptr, nullptr, true, true, status);
if (U_SUCCESS(*status)) {
result.SetLength(target - &result[0]);
ret = ToBufferEndian(env, &result);
}
return ret;
}
MaybeLocal<Object> TranscodeToUcs2(Environment* env,
const char* fromEncoding,
const char* toEncoding,
const char* source,
const size_t source_length,
UErrorCode* status) {
*status = U_ZERO_ERROR;
MaybeLocal<Object> ret;
MaybeStackBuffer<UChar> destbuf(source_length);
Converter from(fromEncoding);
const size_t length_in_chars = source_length * sizeof(UChar);
ucnv_toUChars(from.conv, *destbuf, length_in_chars,
source, source_length, status);
if (U_SUCCESS(*status))
ret = ToBufferEndian(env, &destbuf);
return ret;
}
MaybeLocal<Object> TranscodeFromUcs2(Environment* env,
const char* fromEncoding,
const char* toEncoding,
const char* source,
const size_t source_length,
UErrorCode* status) {
*status = U_ZERO_ERROR;
MaybeStackBuffer<UChar> sourcebuf;
MaybeLocal<Object> ret;
Converter to(toEncoding, "?");
const size_t length_in_chars = source_length / sizeof(UChar);
CopySourceBuffer(&sourcebuf, source, source_length, length_in_chars);
MaybeStackBuffer<char> destbuf(length_in_chars);
const uint32_t len = ucnv_fromUChars(to.conv, *destbuf, length_in_chars,
*sourcebuf, length_in_chars, status);
if (U_SUCCESS(*status)) {
destbuf.SetLength(len);
ret = ToBufferEndian(env, &destbuf);
}
return ret;
}
MaybeLocal<Object> TranscodeUcs2FromUtf8(Environment* env,
const char* fromEncoding,
const char* toEncoding,
const char* source,
const size_t source_length,
UErrorCode* status) {
*status = U_ZERO_ERROR;
MaybeStackBuffer<UChar> destbuf;
int32_t result_length;
u_strFromUTF8(*destbuf, destbuf.capacity(), &result_length,
source, source_length, status);
MaybeLocal<Object> ret;
if (U_SUCCESS(*status)) {
destbuf.SetLength(result_length);
ret = ToBufferEndian(env, &destbuf);
} else if (*status == U_BUFFER_OVERFLOW_ERROR) {
*status = U_ZERO_ERROR;
destbuf.AllocateSufficientStorage(result_length);
u_strFromUTF8(*destbuf, result_length, &result_length,
source, source_length, status);
if (U_SUCCESS(*status)) {
destbuf.SetLength(result_length);
ret = ToBufferEndian(env, &destbuf);
}
}
return ret;
}
MaybeLocal<Object> TranscodeUtf8FromUcs2(Environment* env,
const char* fromEncoding,
const char* toEncoding,
const char* source,
const size_t source_length,
UErrorCode* status) {
*status = U_ZERO_ERROR;
MaybeLocal<Object> ret;
const size_t length_in_chars = source_length / sizeof(UChar);
int32_t result_length;
MaybeStackBuffer<UChar> sourcebuf;
MaybeStackBuffer<char> destbuf;
CopySourceBuffer(&sourcebuf, source, source_length, length_in_chars);
u_strToUTF8(*destbuf, destbuf.capacity(), &result_length,
*sourcebuf, length_in_chars, status);
if (U_SUCCESS(*status)) {
destbuf.SetLength(result_length);
ret = ToBufferEndian(env, &destbuf);
} else if (*status == U_BUFFER_OVERFLOW_ERROR) {
*status = U_ZERO_ERROR;
destbuf.AllocateSufficientStorage(result_length);
u_strToUTF8(*destbuf, result_length, &result_length, *sourcebuf,
length_in_chars, status);
if (U_SUCCESS(*status)) {
destbuf.SetLength(result_length);
ret = ToBufferEndian(env, &destbuf);
}
}
return ret;
}
const char* EncodingName(const enum encoding encoding) {
switch (encoding) {
case ASCII: return "us-ascii";
case LATIN1: return "iso8859-1";
case UCS2: return "utf16le";
case UTF8: return "utf-8";
default: return NULL;
}
}
bool SupportedEncoding(const enum encoding encoding) {
switch (encoding) {
case ASCII:
case LATIN1:
case UCS2:
case UTF8: return true;
default: return false;
}
}
void Transcode(const FunctionCallbackInfo<Value>&args) {
Environment* env = Environment::GetCurrent(args);
Isolate* isolate = env->isolate();
UErrorCode status = U_ZERO_ERROR;
MaybeLocal<Object> result;
THROW_AND_RETURN_UNLESS_BUFFER(env, args[0]);
SPREAD_BUFFER_ARG(args[0], ts_obj);
const enum encoding fromEncoding = ParseEncoding(isolate, args[1], BUFFER);
const enum encoding toEncoding = ParseEncoding(isolate, args[2], BUFFER);
if (SupportedEncoding(fromEncoding) && SupportedEncoding(toEncoding)) {
TranscodeFunc tfn = &Transcode;
switch (fromEncoding) {
case ASCII:
case LATIN1:
if (toEncoding == UCS2)
tfn = &TranscodeToUcs2;
break;
case UTF8:
if (toEncoding == UCS2)
tfn = &TranscodeUcs2FromUtf8;
break;
case UCS2:
switch (toEncoding) {
case UCS2:
tfn = &Transcode;
break;
case UTF8:
tfn = &TranscodeUtf8FromUcs2;
break;
default:
tfn = &TranscodeFromUcs2;
}
break;
default:
// This should not happen because of the SupportedEncoding checks
ABORT();
}
result = tfn(env, EncodingName(fromEncoding), EncodingName(toEncoding),
ts_obj_data, ts_obj_length, &status);
} else {
status = U_ILLEGAL_ARGUMENT_ERROR;
}
if (result.IsEmpty())
return args.GetReturnValue().Set(status);
return args.GetReturnValue().Set(result.ToLocalChecked());
}
void ICUErrorName(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
UErrorCode status = static_cast<UErrorCode>(args[0]->Int32Value());
args.GetReturnValue().Set(
String::NewFromUtf8(env->isolate(),
u_errorName(status),
v8::NewStringType::kNormal).ToLocalChecked());
}
#define TYPE_ICU "icu"
#define TYPE_UNICODE "unicode"
#define TYPE_CLDR "cldr"
#define TYPE_TZ "tz"
/**
* This is the workhorse function that deals with the actual version info.
* Get an ICU version.
* @param type the type of version to get. One of VERSION_TYPES
* @param buf optional buffer for result
* @param status ICU error status. If failure, assume result is undefined.
* @return version number, or NULL. May or may not be buf.
*/
const char* GetVersion(const char* type,
char buf[U_MAX_VERSION_STRING_LENGTH],
UErrorCode* status) {
if (!strcmp(type, TYPE_ICU)) {
return U_ICU_VERSION;
} else if (!strcmp(type, TYPE_UNICODE)) {
return U_UNICODE_VERSION;
} else if (!strcmp(type, TYPE_TZ)) {
return TimeZone::getTZDataVersion(*status);
} else if (!strcmp(type, TYPE_CLDR)) {
UVersionInfo versionArray;
ulocdata_getCLDRVersion(versionArray, status);
if (U_SUCCESS(*status)) {
u_versionToString(versionArray, buf);
return buf;
}
}
// Fall through - unknown type or error case
return nullptr;
}
void GetVersion(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
if ( args.Length() == 0 ) {
// With no args - return a comma-separated list of allowed values
args.GetReturnValue().Set(
String::NewFromUtf8(env->isolate(),
TYPE_ICU ","
TYPE_UNICODE ","
TYPE_CLDR ","
TYPE_TZ));
} else {
CHECK_GE(args.Length(), 1);
CHECK(args[0]->IsString());
Utf8Value val(env->isolate(), args[0]);
UErrorCode status = U_ZERO_ERROR;
char buf[U_MAX_VERSION_STRING_LENGTH] = ""; // Possible output buffer.
const char* versionString = GetVersion(*val, buf, &status);
if (U_SUCCESS(status) && versionString) {
// Success.
args.GetReturnValue().Set(
String::NewFromUtf8(env->isolate(),
versionString));
}
}
}
} // anonymous namespace
bool InitializeICUDirectory(const std::string& path) {
UErrorCode status = U_ZERO_ERROR;
if (path.empty()) {
#ifdef NODE_HAVE_SMALL_ICU
// install the 'small' data.
udata_setCommonData(&SMALL_ICUDATA_ENTRY_POINT, &status);
#else // !NODE_HAVE_SMALL_ICU
// no small data, so nothing to do.
#endif // !NODE_HAVE_SMALL_ICU
} else {
u_setDataDirectory(path.c_str());
u_init(&status);
}
return status == U_ZERO_ERROR;
}
int32_t ToUnicode(MaybeStackBuffer<char>* buf,
const char* input,
size_t length) {
UErrorCode status = U_ZERO_ERROR;
uint32_t options = UIDNA_NONTRANSITIONAL_TO_UNICODE;
UIDNA* uidna = uidna_openUTS46(options, &status);
if (U_FAILURE(status))
return -1;
UIDNAInfo info = UIDNA_INFO_INITIALIZER;
int32_t len = uidna_nameToUnicodeUTF8(uidna,
input, length,
**buf, buf->capacity(),
&info,
&status);
// Do not check info.errors like we do with ToASCII since ToUnicode always
// returns a string, despite any possible errors that may have occurred.
if (status == U_BUFFER_OVERFLOW_ERROR) {
status = U_ZERO_ERROR;
buf->AllocateSufficientStorage(len);
len = uidna_nameToUnicodeUTF8(uidna,
input, length,
**buf, buf->capacity(),
&info,
&status);
}
// info.errors is ignored as UTS #46 ToUnicode always produces a Unicode
// string, regardless of whether an error occurred.
if (U_FAILURE(status)) {
len = -1;
buf->SetLength(0);
} else {
buf->SetLength(len);
}
uidna_close(uidna);
return len;
}
int32_t ToASCII(MaybeStackBuffer<char>* buf,
const char* input,
size_t length,
enum idna_mode mode) {
UErrorCode status = U_ZERO_ERROR;
uint32_t options = // CheckHyphens = false; handled later
UIDNA_CHECK_BIDI | // CheckBidi = true
UIDNA_CHECK_CONTEXTJ | // CheckJoiners = true
UIDNA_NONTRANSITIONAL_TO_ASCII; // Nontransitional_Processing
if (mode == IDNA_STRICT) {
options |= UIDNA_USE_STD3_RULES; // UseSTD3ASCIIRules = beStrict
// VerifyDnsLength = beStrict;
// handled later
}
UIDNA* uidna = uidna_openUTS46(options, &status);
if (U_FAILURE(status))
return -1;
UIDNAInfo info = UIDNA_INFO_INITIALIZER;
int32_t len = uidna_nameToASCII_UTF8(uidna,
input, length,
**buf, buf->capacity(),
&info,
&status);
if (status == U_BUFFER_OVERFLOW_ERROR) {
status = U_ZERO_ERROR;
buf->AllocateSufficientStorage(len);
len = uidna_nameToASCII_UTF8(uidna,
input, length,
**buf, buf->capacity(),
&info,
&status);
}
// In UTS #46 which specifies ToASCII, certain error conditions are
// configurable through options, and the WHATWG URL Standard promptly elects
// to disable some of them to accommodate for real-world use cases.
// Unfortunately, ICU4C's IDNA module does not support disabling some of
// these options through `options` above, and thus continues throwing
// unnecessary errors. To counter this situation, we just filter out the
// errors that may have happened afterwards, before deciding whether to
// return an error from this function.
// CheckHyphens = false
// (Specified in the current UTS #46 draft rev. 18.)
// Refs:
// - https://github.com/whatwg/url/issues/53
// - https://github.com/whatwg/url/pull/309
// - http://www.unicode.org/review/pri317/
// - http://www.unicode.org/reports/tr46/tr46-18.html
// - https://www.icann.org/news/announcement-2000-01-07-en
info.errors &= ~UIDNA_ERROR_HYPHEN_3_4;
info.errors &= ~UIDNA_ERROR_LEADING_HYPHEN;
info.errors &= ~UIDNA_ERROR_TRAILING_HYPHEN;
if (mode != IDNA_STRICT) {
// VerifyDnsLength = beStrict
info.errors &= ~UIDNA_ERROR_EMPTY_LABEL;
info.errors &= ~UIDNA_ERROR_LABEL_TOO_LONG;
info.errors &= ~UIDNA_ERROR_DOMAIN_NAME_TOO_LONG;
}
if (U_FAILURE(status) || (mode != IDNA_LENIENT && info.errors != 0)) {
len = -1;
buf->SetLength(0);
} else {
buf->SetLength(len);
}
uidna_close(uidna);
return len;
}
static void ToUnicode(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
CHECK_GE(args.Length(), 1);
CHECK(args[0]->IsString());
Utf8Value val(env->isolate(), args[0]);
MaybeStackBuffer<char> buf;
int32_t len = ToUnicode(&buf, *val, val.length());
if (len < 0) {
return env->ThrowError("Cannot convert name to Unicode");
}
args.GetReturnValue().Set(
String::NewFromUtf8(env->isolate(),
*buf,
v8::NewStringType::kNormal,
len).ToLocalChecked());
}
static void ToASCII(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
CHECK_GE(args.Length(), 1);
CHECK(args[0]->IsString());
Utf8Value val(env->isolate(), args[0]);
// optional arg
bool lenient = args[1]->BooleanValue(env->context()).FromJust();
enum idna_mode mode = lenient ? IDNA_LENIENT : IDNA_DEFAULT;
MaybeStackBuffer<char> buf;
int32_t len = ToASCII(&buf, *val, val.length(), mode);
if (len < 0) {
return env->ThrowError("Cannot convert name to ASCII");
}
args.GetReturnValue().Set(
String::NewFromUtf8(env->isolate(),
*buf,
v8::NewStringType::kNormal,
len).ToLocalChecked());
}
// This is similar to wcwidth except that it takes the current unicode
// character properties database into consideration, allowing it to
// correctly calculate the column widths of things like emoji's and
// newer wide characters. wcwidth, on the other hand, uses a fixed
// algorithm that does not take things like emoji into proper
// consideration.
//
// TODO(TimothyGu): Investigate Cc (C0/C1 control codes). Both VTE (used by
// GNOME Terminal) and Konsole don't consider them to be zero-width (see refs
// below), and when printed in VTE it is Narrow. However GNOME Terminal doesn't
// allow it to be input. Linux's PTY terminal prints control characters as
// Narrow rhombi.
//
// TODO(TimothyGu): Investigate Hangul jamo characters. Medial vowels and final
// consonants are 0-width when combined with initial consonants; otherwise they
// are technically Wide. But many terminals (including Konsole and
// VTE/GLib-based) implement all medials and finals as 0-width.
//
// Refs: https://eev.ee/blog/2015/09/12/dark-corners-of-unicode/#combining-characters-and-character-width
// Refs: https://github.com/GNOME/glib/blob/79e4d4c6be/glib/guniprop.c#L388-L420
// Refs: https://github.com/KDE/konsole/blob/8c6a5d13c0/src/konsole_wcwidth.cpp#L101-L223
static int GetColumnWidth(UChar32 codepoint,
bool ambiguous_as_full_width = false) {
const auto zero_width_mask = U_GC_CC_MASK | // C0/C1 control code
U_GC_CF_MASK | // Format control character
U_GC_ME_MASK | // Enclosing mark
U_GC_MN_MASK; // Nonspacing mark
if (codepoint != 0x00AD && // SOFT HYPHEN is Cf but not zero-width
((U_MASK(u_charType(codepoint)) & zero_width_mask) ||
u_hasBinaryProperty(codepoint, UCHAR_EMOJI_MODIFIER))) {
return 0;
}
// UCHAR_EAST_ASIAN_WIDTH is the Unicode property that identifies a
// codepoint as being full width, wide, ambiguous, neutral, narrow,
// or halfwidth.
const int eaw = u_getIntPropertyValue(codepoint, UCHAR_EAST_ASIAN_WIDTH);
switch (eaw) {
case U_EA_FULLWIDTH:
case U_EA_WIDE:
return 2;
case U_EA_AMBIGUOUS:
// See: http://www.unicode.org/reports/tr11/#Ambiguous for details
if (ambiguous_as_full_width) {
return 2;
}
// Fall through if ambiguous_as_full_width if false.
case U_EA_NEUTRAL:
if (u_hasBinaryProperty(codepoint, UCHAR_EMOJI_PRESENTATION)) {
return 2;
}
// Fall through
case U_EA_HALFWIDTH:
case U_EA_NARROW:
default:
return 1;
}
}
// Returns the column width for the given String.
static void GetStringWidth(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
if (args.Length() < 1)
return;
bool ambiguous_as_full_width = args[1]->BooleanValue();
bool expand_emoji_sequence = args[2]->BooleanValue();
if (args[0]->IsNumber()) {
args.GetReturnValue().Set(
GetColumnWidth(args[0]->Uint32Value(),
ambiguous_as_full_width));
return;
}
TwoByteValue value(env->isolate(), args[0]);
// reinterpret_cast is required by windows to compile
UChar* str = reinterpret_cast<UChar*>(*value);
static_assert(sizeof(*str) == sizeof(**value),
"sizeof(*str) == sizeof(**value)");
UChar32 c = 0;
UChar32 p;
size_t n = 0;
uint32_t width = 0;
while (n < value.length()) {
p = c;
U16_NEXT(str, n, value.length(), c);
// Don't count individual emoji codepoints that occur within an
// emoji sequence. This is not necessarily foolproof. Some
// environments display emoji sequences in the appropriate
// condensed form (as a single emoji glyph), other environments
// may not understand an emoji sequence and will display each
// individual emoji separately. When this happens, the width
// calculated will be off, and there's no reliable way of knowing
// in advance if a particular sequence is going to be supported.
// The expand_emoji_sequence option allows the caller to skip this
// check and count each code within an emoji sequence separately.
if (!expand_emoji_sequence &&
n > 0 && p == 0x200d && // 0x200d == ZWJ (zero width joiner)
(u_hasBinaryProperty(c, UCHAR_EMOJI_PRESENTATION) ||
u_hasBinaryProperty(c, UCHAR_EMOJI_MODIFIER))) {
continue;
}
width += GetColumnWidth(c, ambiguous_as_full_width);
}
args.GetReturnValue().Set(width);
}
void Init(Local<Object> target,
Local<Value> unused,
Local<Context> context,
void* priv) {
Environment* env = Environment::GetCurrent(context);
env->SetMethod(target, "toUnicode", ToUnicode);
env->SetMethod(target, "toASCII", ToASCII);
env->SetMethod(target, "getStringWidth", GetStringWidth);
env->SetMethod(target, "getVersion", GetVersion);
// One-shot converters
env->SetMethod(target, "icuErrName", ICUErrorName);
env->SetMethod(target, "transcode", Transcode);
// ConverterObject
env->SetMethod(target, "getConverter", ConverterObject::Create);
env->SetMethod(target, "decode", ConverterObject::Decode);
env->SetMethod(target, "hasConverter", ConverterObject::Has);
}
} // namespace i18n
} // namespace node
NODE_BUILTIN_MODULE_CONTEXT_AWARE(icu, node::i18n::Init)
#endif // NODE_HAVE_I18N_SUPPORT
|