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node/src/node_i18n.cc

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/*
* 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.h"
#include "env-inl.h"
#include "util.h"
#include "util-inl.h"
#include "v8.h"
#include <unicode/utypes.h>
#include <unicode/putil.h>
#include <unicode/uchar.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>
#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::Isolate;
using v8::Local;
using v8::MaybeLocal;
using v8::Object;
using v8::String;
using v8::Value;
bool flag_icu_data_dir = false;
namespace i18n {
const size_t kStorageSize = 1024;
// TODO(jasnell): This could potentially become a member of MaybeStackBuffer
// at some point in the future. Care would need to be taken with the
// MaybeStackBuffer<UChar> variant below.
MaybeLocal<Object> AsBuffer(Isolate* isolate,
MaybeStackBuffer<char>* buf,
size_t len) {
if (buf->IsAllocated()) {
MaybeLocal<Object> ret = Buffer::New(isolate, buf->out(), len);
if (!ret.IsEmpty()) buf->Release();
return ret;
}
return Buffer::Copy(isolate, buf->out(), len);
}
MaybeLocal<Object> AsBuffer(Isolate* isolate,
MaybeStackBuffer<UChar>* buf,
size_t len) {
char* dst = reinterpret_cast<char*>(**buf);
MaybeLocal<Object> ret;
if (buf->IsAllocated()) {
ret = Buffer::New(isolate, dst, len);
if (!ret.IsEmpty()) buf->Release();
} else {
ret = Buffer::Copy(isolate, dst, len);
}
if (!ret.IsEmpty() && IsBigEndian()) {
SPREAD_BUFFER_ARG(ret.ToLocalChecked(), buf);
SwapBytes16(buf_data, buf_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);
}
}
~Converter() {
ucnv_close(conv);
}
UConverter* conv;
};
// 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)(Isolate* isolate,
const char* fromEncoding,
const char* toEncoding,
const char* source,
const size_t source_length,
UErrorCode* status);
MaybeLocal<Object> Transcode(Isolate* isolate,
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))
ret = AsBuffer(isolate, &result, target - &result[0]);
return ret;
}
MaybeLocal<Object> TranscodeToUcs2(Isolate* isolate,
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 = AsBuffer(isolate, &destbuf, length_in_chars);
return ret;
}
MaybeLocal<Object> TranscodeFromUcs2(Isolate* isolate,
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))
ret = AsBuffer(isolate, &destbuf, len);
return ret;
}
MaybeLocal<Object> TranscodeUcs2FromUtf8(Isolate* isolate,
const char* fromEncoding,
const char* toEncoding,
const char* source,
const size_t source_length,
UErrorCode* status) {
*status = U_ZERO_ERROR;
MaybeStackBuffer<UChar, kStorageSize> destbuf;
int32_t result_length;
u_strFromUTF8(*destbuf, kStorageSize, &result_length,
source, source_length, status);
MaybeLocal<Object> ret;
if (U_SUCCESS(*status)) {
ret = AsBuffer(isolate, &destbuf, result_length * sizeof(**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))
ret = AsBuffer(isolate, &destbuf, result_length * sizeof(**destbuf));
}
return ret;
}
MaybeLocal<Object> TranscodeUtf8FromUcs2(Isolate* isolate,
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, kStorageSize> destbuf;
CopySourceBuffer(&sourcebuf, source, source_length, length_in_chars);
u_strToUTF8(*destbuf, kStorageSize, &result_length,
*sourcebuf, length_in_chars, status);
if (U_SUCCESS(*status)) {
ret = AsBuffer(isolate, &destbuf, result_length);
} 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)) {
ret = Buffer::New(isolate, *destbuf, result_length);
destbuf.Release();
}
}
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(isolate, 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());
}
static 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.
*/
static 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;
}
static 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));
}
}
}
bool InitializeICUDirectory(const char* icu_data_path) {
if (icu_data_path != nullptr) {
flag_icu_data_dir = true;
u_setDataDirectory(icu_data_path);
return true; // no error
} else {
UErrorCode status = U_ZERO_ERROR;
#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
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_DEFAULT;
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->length(),
&info,
&status);
if (status == U_BUFFER_OVERFLOW_ERROR) {
status = U_ZERO_ERROR;
buf->AllocateSufficientStorage(len);
len = uidna_nameToUnicodeUTF8(uidna,
input, length,
**buf, buf->length(),
&info,
&status);
}
if (U_FAILURE(status))
len = -1;
uidna_close(uidna);
return len;
}
int32_t ToASCII(MaybeStackBuffer<char>* buf,
const char* input,
size_t length) {
UErrorCode status = U_ZERO_ERROR;
uint32_t options = UIDNA_DEFAULT;
options |= UIDNA_NONTRANSITIONAL_TO_ASCII;
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->length(),
&info,
&status);
if (status == U_BUFFER_OVERFLOW_ERROR) {
status = U_ZERO_ERROR;
buf->AllocateSufficientStorage(len);
len = uidna_nameToASCII_UTF8(uidna,
input, length,
**buf, buf->length(),
&info,
&status);
}
if (U_FAILURE(status))
len = -1;
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]);
MaybeStackBuffer<char> buf;
int32_t len = ToASCII(&buf, *val, val.length());
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.
static int GetColumnWidth(UChar32 codepoint,
bool ambiguous_as_full_width = false) {
if (!u_isdefined(codepoint) ||
u_iscntrl(codepoint) ||
u_getCombiningClass(codepoint) > 0 ||
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);
}
} // namespace i18n
} // namespace node
NODE_MODULE_CONTEXT_AWARE_BUILTIN(icu, node::i18n::Init)
#endif // NODE_HAVE_I18N_SUPPORT