src/number-format.cc - external/v8-i18n - Git at Google

 // Copyright 2012 the v8-i18n authors.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
 //    http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.

 #include "src/number-format.h"

 #include <string.h>

 #include "src/utils.h"
 #include "unicode/curramt.h"
 #include "unicode/dcfmtsym.h"
 #include "unicode/decimfmt.h"
 #include "unicode/locid.h"
 #include "unicode/numfmt.h"
 #include "unicode/numsys.h"
 #include "unicode/uchar.h"
 #include "unicode/ucurr.h"
 #include "unicode/unum.h"
 #include "unicode/uversion.h"

 namespace v8_i18n {

 static icu::DecimalFormat* InitializeNumberFormat(v8::Handle<v8::String>,
                                                   v8::Handle<v8::Object>,
                                                   v8::Handle<v8::Object>);
 static icu::DecimalFormat* CreateICUNumberFormat(const icu::Locale&,
                                                  v8::Handle<v8::Object>);
 static void SetResolvedSettings(const icu::Locale&,
                                 icu::DecimalFormat*,
                                 v8::Handle<v8::Object>);

 icu::DecimalFormat* NumberFormat::UnpackNumberFormat(
     v8::Handle<v8::Object> obj) {
   v8::HandleScope handle_scope;

   // v8::ObjectTemplate doesn't have HasInstance method so we can't check
   // if obj is an instance of NumberFormat class. We'll check for a property
   // that has to be in the object. The same applies to other services, like
   // Collator and DateTimeFormat.
   if (obj->HasOwnProperty(v8::String::New("numberFormat"))) {
     return static_cast<icu::DecimalFormat*>(
         obj->GetAlignedPointerFromInternalField(0));
   }

   return NULL;
 }

 void NumberFormat::DeleteNumberFormat(v8::Isolate* isolate,
                                       v8::Persistent<v8::Object>* object,
                                       void* param) {
   // First delete the hidden C++ object.
   // Unpacking should never return NULL here. That would only happen if
   // this method is used as the weak callback for persistent handles not
   // pointing to a date time formatter.
   v8::HandleScope handle_scope(isolate);
   v8::Local<v8::Object> handle = v8::Local<v8::Object>::New(isolate, *object);
   delete UnpackNumberFormat(handle);

   // Then dispose of the persistent handle to JS object.
   object->Dispose(isolate);
 }

 v8::Handle<v8::Value> NumberFormat::JSInternalFormat(
     const v8::Arguments& args) {
   if (args.Length() != 2 || !args[0]->IsObject() || !args[1]->IsNumber()) {
     return v8::ThrowException(v8::Exception::Error(
         v8::String::New("Formatter and numeric value have to be specified.")));
   }

   icu::DecimalFormat* number_format = UnpackNumberFormat(args[0]->ToObject());
   if (!number_format) {
     return v8::ThrowException(v8::Exception::Error(
         v8::String::New("NumberFormat method called on an object "
                         "that is not a NumberFormat.")));
   }

   // ICU will handle actual NaN value properly and return NaN string.
   icu::UnicodeString result;
   number_format->format(args[1]->NumberValue(), result);

   return v8::String::New(
       reinterpret_cast<const uint16_t*>(result.getBuffer()), result.length());
 }

 v8::Handle<v8::Value> NumberFormat::JSInternalParse(
     const v8::Arguments& args) {
   if (args.Length() != 2 || !args[0]->IsObject() || !args[1]->IsString()) {
     return v8::ThrowException(v8::Exception::Error(
         v8::String::New("Formatter and string have to be specified.")));
   }

   icu::DecimalFormat* number_format = UnpackNumberFormat(args[0]->ToObject());
   if (!number_format) {
     return v8::ThrowException(v8::Exception::Error(
         v8::String::New("NumberFormat method called on an object "
                         "that is not a NumberFormat.")));
   }

   // ICU will handle actual NaN value properly and return NaN string.
   icu::UnicodeString string_number;
   if (!Utils::V8StringToUnicodeString(args[1]->ToString(), &string_number)) {
     string_number = "";
   }

   UErrorCode status = U_ZERO_ERROR;
   icu::Formattable result;
   // ICU 4.6 doesn't support parseCurrency call. We need to wait for ICU49
   // to be part of Chrome.
   // TODO(cira): Include currency parsing code using parseCurrency call.
   // We need to check if the formatter parses all currencies or only the
   // one it was constructed with (it will impact the API - how to return ISO
   // code and the value).
   number_format->parse(string_number, result, status);
   if (U_FAILURE(status)) {
     return v8::Undefined();
   }

   switch (result.getType()) {
   case icu::Formattable::kDouble:
     return v8::Number::New(result.getDouble());
     break;
   case icu::Formattable::kLong:
     return v8::Number::New(result.getLong());
     break;
   case icu::Formattable::kInt64:
     return v8::Number::New(result.getInt64());
     break;
   default:
     return v8::Undefined();
   }

   // To make compiler happy.
   return v8::Undefined();
 }

 void NumberFormat::JSCreateNumberFormat(
     const v8::FunctionCallbackInfo<v8::Value>& args) {
   if (args.Length() != 3 ||
       !args[0]->IsString() ||
       !args[1]->IsObject() ||
       !args[2]->IsObject()) {
     v8::ThrowException(v8::Exception::Error(
         v8::String::New("Internal error, wrong parameters.")));
     return;
   }

   v8::Isolate* isolate = args.GetIsolate();
   v8::Local<v8::ObjectTemplate> number_format_template =
       Utils::GetTemplate(isolate);

   // Create an empty object wrapper.
   v8::Local<v8::Object> local_object = number_format_template->NewInstance();
   // But the handle shouldn't be empty.
   // That can happen if there was a stack overflow when creating the object.
   if (local_object.IsEmpty()) {
     args.GetReturnValue().Set(local_object);
     return;
   }

   // Set number formatter as internal field of the resulting JS object.
   icu::DecimalFormat* number_format = InitializeNumberFormat(
       args[0]->ToString(), args[1]->ToObject(), args[2]->ToObject());

   if (!number_format) {
     v8::ThrowException(v8::Exception::Error(v8::String::New(
         "Internal error. Couldn't create ICU number formatter.")));
     return;
   } else {
     local_object->SetAlignedPointerInInternalField(0, number_format);

     v8::TryCatch try_catch;
     local_object->Set(v8::String::New("numberFormat"), v8::String::New("valid"));
     if (try_catch.HasCaught()) {
       v8::ThrowException(v8::Exception::Error(
           v8::String::New("Internal error, couldn't set property.")));
       return;
     }
   }

   v8::Persistent<v8::Object> wrapper(isolate, local_object);
   // Make object handle weak so we can delete iterator once GC kicks in.
   wrapper.MakeWeak<void>(NULL, &DeleteNumberFormat);
   args.GetReturnValue().Set(wrapper);
   wrapper.ClearAndLeak();
 }

 static icu::DecimalFormat* InitializeNumberFormat(
     v8::Handle<v8::String> locale,
     v8::Handle<v8::Object> options,
     v8::Handle<v8::Object> resolved) {
   // Convert BCP47 into ICU locale format.
   UErrorCode status = U_ZERO_ERROR;
   icu::Locale icu_locale;
   char icu_result[ULOC_FULLNAME_CAPACITY];
   int icu_length = 0;
   v8::String::AsciiValue bcp47_locale(locale);
   if (bcp47_locale.length() != 0) {
     uloc_forLanguageTag(*bcp47_locale, icu_result, ULOC_FULLNAME_CAPACITY,
                         &icu_length, &status);
     if (U_FAILURE(status) || icu_length == 0) {
       return NULL;
     }
     icu_locale = icu::Locale(icu_result);
   }

   icu::DecimalFormat* number_format =
       CreateICUNumberFormat(icu_locale, options);
   if (!number_format) {
     // Remove extensions and try again.
     icu::Locale no_extension_locale(icu_locale.getBaseName());
     number_format = CreateICUNumberFormat(no_extension_locale, options);

     // Set resolved settings (pattern, numbering system).
     SetResolvedSettings(no_extension_locale, number_format, resolved);
   } else {
     SetResolvedSettings(icu_locale, number_format, resolved);
   }

   return number_format;
 }

 static icu::DecimalFormat* CreateICUNumberFormat(
     const icu::Locale& icu_locale, v8::Handle<v8::Object> options) {
   // Make formatter from options. Numbering system is added
   // to the locale as Unicode extension (if it was specified at all).
   UErrorCode status = U_ZERO_ERROR;
   icu::DecimalFormat* number_format = NULL;
   icu::UnicodeString style;
   icu::UnicodeString currency;
   if (Utils::ExtractStringSetting(options, "style", &style)) {
     if (style == UNICODE_STRING_SIMPLE("currency")) {
       Utils::ExtractStringSetting(options, "currency", &currency);

       icu::UnicodeString display;
       Utils::ExtractStringSetting(options, "currencyDisplay", &display);
 #if (U_ICU_VERSION_MAJOR_NUM == 4) && (U_ICU_VERSION_MINOR_NUM <= 6)
       icu::NumberFormat::EStyles style;
       if (display == UNICODE_STRING_SIMPLE("code")) {
         style = icu::NumberFormat::kIsoCurrencyStyle;
       } else if (display == UNICODE_STRING_SIMPLE("name")) {
         style = icu::NumberFormat::kPluralCurrencyStyle;
       } else {
         style = icu::NumberFormat::kCurrencyStyle;
       }
 #else  // ICU version is 4.8 or above (we ignore versions below 4.0).
       UNumberFormatStyle style;
       if (display == UNICODE_STRING_SIMPLE("code")) {
         style = UNUM_CURRENCY_ISO;
       } else if (display == UNICODE_STRING_SIMPLE("name")) {
         style = UNUM_CURRENCY_PLURAL;
       } else {
         style = UNUM_CURRENCY;
       }
 #endif

       number_format = static_cast<icu::DecimalFormat*>(
           icu::NumberFormat::createInstance(icu_locale, style,  status));
     } else if (style == UNICODE_STRING_SIMPLE("percent")) {
       number_format = static_cast<icu::DecimalFormat*>(
           icu::NumberFormat::createPercentInstance(icu_locale, status));
       if (U_FAILURE(status)) {
         delete number_format;
         return NULL;
       }
       // Make sure 1.1% doesn't go into 2%.
       number_format->setMinimumFractionDigits(1);
     } else {
       // Make a decimal instance by default.
       number_format = static_cast<icu::DecimalFormat*>(
           icu::NumberFormat::createInstance(icu_locale, status));
     }
   }

   if (U_FAILURE(status)) {
     delete number_format;
     return NULL;
   }

   // Set all options.
   if (!currency.isEmpty()) {
     number_format->setCurrency(currency.getBuffer(), status);
   }

   int32_t digits;
   if (Utils::ExtractIntegerSetting(
           options, "minimumIntegerDigits", &digits)) {
     number_format->setMinimumIntegerDigits(digits);
   }

   if (Utils::ExtractIntegerSetting(
           options, "minimumFractionDigits", &digits)) {
     number_format->setMinimumFractionDigits(digits);
   }

   if (Utils::ExtractIntegerSetting(
           options, "maximumFractionDigits", &digits)) {
     number_format->setMaximumFractionDigits(digits);
   }

   if (Utils::ExtractIntegerSetting(
           options, "minimumSignificantDigits", &digits)) {
     number_format->setMinimumSignificantDigits(digits);
   }

   if (Utils::ExtractIntegerSetting(
           options, "maximumSignificantDigits", &digits)) {
     number_format->setMaximumSignificantDigits(digits);
   }

   bool grouping;
   if (Utils::ExtractBooleanSetting(options, "useGrouping", &grouping)) {
     number_format->setGroupingUsed(grouping);
   }

   // Set rounding mode.
   number_format->setRoundingMode(icu::DecimalFormat::kRoundHalfUp);

   return number_format;
 }

 static void SetResolvedSettings(const icu::Locale& icu_locale,
                                 icu::DecimalFormat* number_format,
                                 v8::Handle<v8::Object> resolved) {
   icu::UnicodeString pattern;
   number_format->toPattern(pattern);
   resolved->Set(v8::String::New("pattern"),
                 v8::String::New(reinterpret_cast<const uint16_t*>(
                     pattern.getBuffer()), pattern.length()));

   // Set resolved currency code in options.currency if not empty.
   icu::UnicodeString currency(number_format->getCurrency());
   if (!currency.isEmpty()) {
     resolved->Set(v8::String::New("currency"),
                   v8::String::New(reinterpret_cast<const uint16_t*>(
                       currency.getBuffer()), currency.length()));
   }

   // Ugly hack. ICU doesn't expose numbering system in any way, so we have
   // to assume that for given locale NumberingSystem constructor produces the
   // same digits as NumberFormat would.
   UErrorCode status = U_ZERO_ERROR;
   icu::NumberingSystem* numbering_system =
       icu::NumberingSystem::createInstance(icu_locale, status);
   if (U_SUCCESS(status)) {
     const char* ns = numbering_system->getName();
     resolved->Set(v8::String::New("numberingSystem"), v8::String::New(ns));
   } else {
     resolved->Set(v8::String::New("numberingSystem"), v8::Undefined());
   }
   delete numbering_system;

   resolved->Set(v8::String::New("useGrouping"),
                 v8::Boolean::New(number_format->isGroupingUsed()));

   resolved->Set(v8::String::New("minimumIntegerDigits"),
                 v8::Integer::New(number_format->getMinimumIntegerDigits()));

   resolved->Set(v8::String::New("minimumFractionDigits"),
                 v8::Integer::New(number_format->getMinimumFractionDigits()));

   resolved->Set(v8::String::New("maximumFractionDigits"),
                 v8::Integer::New(number_format->getMaximumFractionDigits()));

   if (resolved->HasOwnProperty(v8::String::New("minimumSignificantDigits"))) {
     resolved->Set(v8::String::New("minimumSignificantDigits"), v8::Integer::New(
         number_format->getMinimumSignificantDigits()));
   }

   if (resolved->HasOwnProperty(v8::String::New("maximumSignificantDigits"))) {
     resolved->Set(v8::String::New("maximumSignificantDigits"), v8::Integer::New(
         number_format->getMaximumSignificantDigits()));
   }

   // Set the locale
   char result[ULOC_FULLNAME_CAPACITY];
   status = U_ZERO_ERROR;
   uloc_toLanguageTag(
       icu_locale.getName(), result, ULOC_FULLNAME_CAPACITY, FALSE, &status);
   if (U_SUCCESS(status)) {
     resolved->Set(v8::String::New("locale"), v8::String::New(result));
   } else {
     // This would never happen, since we got the locale from ICU.
     resolved->Set(v8::String::New("locale"), v8::String::New("und"));
   }
 }

 }  // namespace v8_i18n
	// Copyright 2012 the v8-i18n authors.
	//
	// Licensed under the Apache License, Version 2.0 (the "License");
	// you may not use this file except in compliance with the License.
	// You may obtain a copy of the License at
	//
	// http://www.apache.org/licenses/LICENSE-2.0
	//
	// Unless required by applicable law or agreed to in writing, software
	// distributed under the License is distributed on an "AS IS" BASIS,
	// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	// See the License for the specific language governing permissions and
	// limitations under the License.

	#include "src/number-format.h"

	#include <string.h>

	#include "src/utils.h"
	#include "unicode/curramt.h"
	#include "unicode/dcfmtsym.h"
	#include "unicode/decimfmt.h"
	#include "unicode/locid.h"
	#include "unicode/numfmt.h"
	#include "unicode/numsys.h"
	#include "unicode/uchar.h"
	#include "unicode/ucurr.h"
	#include "unicode/unum.h"
	#include "unicode/uversion.h"

	namespace v8_i18n {

	static icu::DecimalFormat* InitializeNumberFormat(v8::Handle<v8::String>,
	v8::Handle<v8::Object>,
	v8::Handle<v8::Object>);
	static icu::DecimalFormat* CreateICUNumberFormat(const icu::Locale&,
	v8::Handle<v8::Object>);
	static void SetResolvedSettings(const icu::Locale&,
	icu::DecimalFormat*,
	v8::Handle<v8::Object>);

	icu::DecimalFormat* NumberFormat::UnpackNumberFormat(
	v8::Handle<v8::Object> obj) {
	v8::HandleScope handle_scope;

	// v8::ObjectTemplate doesn't have HasInstance method so we can't check
	// if obj is an instance of NumberFormat class. We'll check for a property
	// that has to be in the object. The same applies to other services, like
	// Collator and DateTimeFormat.
	if (obj->HasOwnProperty(v8::String::New("numberFormat"))) {
	return static_cast<icu::DecimalFormat*>(
	obj->GetAlignedPointerFromInternalField(0));
	}

	return NULL;
	}

	void NumberFormat::DeleteNumberFormat(v8::Isolate* isolate,
	v8::Persistent<v8::Object>* object,
	void* param) {
	// First delete the hidden C++ object.
	// Unpacking should never return NULL here. That would only happen if
	// this method is used as the weak callback for persistent handles not
	// pointing to a date time formatter.
	v8::HandleScope handle_scope(isolate);
	v8::Local<v8::Object> handle = v8::Local<v8::Object>::New(isolate, *object);
	delete UnpackNumberFormat(handle);

	// Then dispose of the persistent handle to JS object.
	object->Dispose(isolate);
	}

	v8::Handle<v8::Value> NumberFormat::JSInternalFormat(
	const v8::Arguments& args) {
	if (args.Length() != 2 \|\| !args[0]->IsObject() \|\| !args[1]->IsNumber()) {
	return v8::ThrowException(v8::Exception::Error(
	v8::String::New("Formatter and numeric value have to be specified.")));
	}

	icu::DecimalFormat* number_format = UnpackNumberFormat(args[0]->ToObject());
	if (!number_format) {
	return v8::ThrowException(v8::Exception::Error(
	v8::String::New("NumberFormat method called on an object "
	"that is not a NumberFormat.")));
	}

	// ICU will handle actual NaN value properly and return NaN string.
	icu::UnicodeString result;
	number_format->format(args[1]->NumberValue(), result);

	return v8::String::New(
	reinterpret_cast<const uint16_t*>(result.getBuffer()), result.length());
	}

	v8::Handle<v8::Value> NumberFormat::JSInternalParse(
	const v8::Arguments& args) {
	if (args.Length() != 2 \|\| !args[0]->IsObject() \|\| !args[1]->IsString()) {
	return v8::ThrowException(v8::Exception::Error(
	v8::String::New("Formatter and string have to be specified.")));
	}

	icu::DecimalFormat* number_format = UnpackNumberFormat(args[0]->ToObject());
	if (!number_format) {
	return v8::ThrowException(v8::Exception::Error(
	v8::String::New("NumberFormat method called on an object "
	"that is not a NumberFormat.")));
	}

	// ICU will handle actual NaN value properly and return NaN string.
	icu::UnicodeString string_number;
	if (!Utils::V8StringToUnicodeString(args[1]->ToString(), &string_number)) {
	string_number = "";
	}

	UErrorCode status = U_ZERO_ERROR;
	icu::Formattable result;
	// ICU 4.6 doesn't support parseCurrency call. We need to wait for ICU49
	// to be part of Chrome.
	// TODO(cira): Include currency parsing code using parseCurrency call.
	// We need to check if the formatter parses all currencies or only the
	// one it was constructed with (it will impact the API - how to return ISO
	// code and the value).
	number_format->parse(string_number, result, status);
	if (U_FAILURE(status)) {
	return v8::Undefined();
	}

	switch (result.getType()) {
	case icu::Formattable::kDouble:
	return v8::Number::New(result.getDouble());
	break;
	case icu::Formattable::kLong:
	return v8::Number::New(result.getLong());
	break;
	case icu::Formattable::kInt64:
	return v8::Number::New(result.getInt64());
	break;
	default:
	return v8::Undefined();
	}

	// To make compiler happy.
	return v8::Undefined();
	}

	void NumberFormat::JSCreateNumberFormat(
	const v8::FunctionCallbackInfo<v8::Value>& args) {
	if (args.Length() != 3 \|\|
	!args[0]->IsString() \|\|
	!args[1]->IsObject() \|\|
	!args[2]->IsObject()) {
	v8::ThrowException(v8::Exception::Error(
	v8::String::New("Internal error, wrong parameters.")));
	return;
	}

	v8::Isolate* isolate = args.GetIsolate();
	v8::Local<v8::ObjectTemplate> number_format_template =
	Utils::GetTemplate(isolate);

	// Create an empty object wrapper.
	v8::Local<v8::Object> local_object = number_format_template->NewInstance();
	// But the handle shouldn't be empty.
	// That can happen if there was a stack overflow when creating the object.
	if (local_object.IsEmpty()) {
	args.GetReturnValue().Set(local_object);
	return;
	}

	// Set number formatter as internal field of the resulting JS object.
	icu::DecimalFormat* number_format = InitializeNumberFormat(
	args[0]->ToString(), args[1]->ToObject(), args[2]->ToObject());

	if (!number_format) {
	v8::ThrowException(v8::Exception::Error(v8::String::New(
	"Internal error. Couldn't create ICU number formatter.")));
	return;
	} else {
	local_object->SetAlignedPointerInInternalField(0, number_format);

	v8::TryCatch try_catch;
	local_object->Set(v8::String::New("numberFormat"), v8::String::New("valid"));
	if (try_catch.HasCaught()) {
	v8::ThrowException(v8::Exception::Error(
	v8::String::New("Internal error, couldn't set property.")));
	return;
	}
	}

	v8::Persistent<v8::Object> wrapper(isolate, local_object);
	// Make object handle weak so we can delete iterator once GC kicks in.
	wrapper.MakeWeak<void>(NULL, &DeleteNumberFormat);
	args.GetReturnValue().Set(wrapper);
	wrapper.ClearAndLeak();
	}

	static icu::DecimalFormat* InitializeNumberFormat(
	v8::Handle<v8::String> locale,
	v8::Handle<v8::Object> options,
	v8::Handle<v8::Object> resolved) {
	// Convert BCP47 into ICU locale format.
	UErrorCode status = U_ZERO_ERROR;
	icu::Locale icu_locale;
	char icu_result[ULOC_FULLNAME_CAPACITY];
	int icu_length = 0;
	v8::String::AsciiValue bcp47_locale(locale);
	if (bcp47_locale.length() != 0) {
	uloc_forLanguageTag(*bcp47_locale, icu_result, ULOC_FULLNAME_CAPACITY,
	&icu_length, &status);
	if (U_FAILURE(status) \|\| icu_length == 0) {
	return NULL;
	}
	icu_locale = icu::Locale(icu_result);
	}

	icu::DecimalFormat* number_format =
	CreateICUNumberFormat(icu_locale, options);
	if (!number_format) {
	// Remove extensions and try again.
	icu::Locale no_extension_locale(icu_locale.getBaseName());
	number_format = CreateICUNumberFormat(no_extension_locale, options);

	// Set resolved settings (pattern, numbering system).
	SetResolvedSettings(no_extension_locale, number_format, resolved);
	} else {
	SetResolvedSettings(icu_locale, number_format, resolved);
	}

	return number_format;
	}

	static icu::DecimalFormat* CreateICUNumberFormat(
	const icu::Locale& icu_locale, v8::Handle<v8::Object> options) {
	// Make formatter from options. Numbering system is added
	// to the locale as Unicode extension (if it was specified at all).
	UErrorCode status = U_ZERO_ERROR;
	icu::DecimalFormat* number_format = NULL;
	icu::UnicodeString style;
	icu::UnicodeString currency;
	if (Utils::ExtractStringSetting(options, "style", &style)) {
	if (style == UNICODE_STRING_SIMPLE("currency")) {
	Utils::ExtractStringSetting(options, "currency", &currency);

	icu::UnicodeString display;
	Utils::ExtractStringSetting(options, "currencyDisplay", &display);
	#if (U_ICU_VERSION_MAJOR_NUM == 4) && (U_ICU_VERSION_MINOR_NUM <= 6)
	icu::NumberFormat::EStyles style;
	if (display == UNICODE_STRING_SIMPLE("code")) {
	style = icu::NumberFormat::kIsoCurrencyStyle;
	} else if (display == UNICODE_STRING_SIMPLE("name")) {
	style = icu::NumberFormat::kPluralCurrencyStyle;
	} else {
	style = icu::NumberFormat::kCurrencyStyle;
	}
	#else // ICU version is 4.8 or above (we ignore versions below 4.0).
	UNumberFormatStyle style;
	if (display == UNICODE_STRING_SIMPLE("code")) {
	style = UNUM_CURRENCY_ISO;
	} else if (display == UNICODE_STRING_SIMPLE("name")) {
	style = UNUM_CURRENCY_PLURAL;
	} else {
	style = UNUM_CURRENCY;
	}
	#endif

	number_format = static_cast<icu::DecimalFormat*>(
	icu::NumberFormat::createInstance(icu_locale, style, status));
	} else if (style == UNICODE_STRING_SIMPLE("percent")) {
	number_format = static_cast<icu::DecimalFormat*>(
	icu::NumberFormat::createPercentInstance(icu_locale, status));
	if (U_FAILURE(status)) {
	delete number_format;
	return NULL;
	}
	// Make sure 1.1% doesn't go into 2%.
	number_format->setMinimumFractionDigits(1);
	} else {
	// Make a decimal instance by default.
	number_format = static_cast<icu::DecimalFormat*>(
	icu::NumberFormat::createInstance(icu_locale, status));
	}
	}

	if (U_FAILURE(status)) {
	delete number_format;
	return NULL;
	}

	// Set all options.
	if (!currency.isEmpty()) {
	number_format->setCurrency(currency.getBuffer(), status);
	}

	int32_t digits;
	if (Utils::ExtractIntegerSetting(
	options, "minimumIntegerDigits", &digits)) {
	number_format->setMinimumIntegerDigits(digits);
	}

	if (Utils::ExtractIntegerSetting(
	options, "minimumFractionDigits", &digits)) {
	number_format->setMinimumFractionDigits(digits);
	}

	if (Utils::ExtractIntegerSetting(
	options, "maximumFractionDigits", &digits)) {
	number_format->setMaximumFractionDigits(digits);
	}

	if (Utils::ExtractIntegerSetting(
	options, "minimumSignificantDigits", &digits)) {
	number_format->setMinimumSignificantDigits(digits);
	}

	if (Utils::ExtractIntegerSetting(
	options, "maximumSignificantDigits", &digits)) {
	number_format->setMaximumSignificantDigits(digits);
	}

	bool grouping;
	if (Utils::ExtractBooleanSetting(options, "useGrouping", &grouping)) {
	number_format->setGroupingUsed(grouping);
	}

	// Set rounding mode.
	number_format->setRoundingMode(icu::DecimalFormat::kRoundHalfUp);

	return number_format;
	}

	static void SetResolvedSettings(const icu::Locale& icu_locale,
	icu::DecimalFormat* number_format,
	v8::Handle<v8::Object> resolved) {
	icu::UnicodeString pattern;
	number_format->toPattern(pattern);
	resolved->Set(v8::String::New("pattern"),
	v8::String::New(reinterpret_cast<const uint16_t*>(
	pattern.getBuffer()), pattern.length()));

	// Set resolved currency code in options.currency if not empty.
	icu::UnicodeString currency(number_format->getCurrency());
	if (!currency.isEmpty()) {
	resolved->Set(v8::String::New("currency"),
	v8::String::New(reinterpret_cast<const uint16_t*>(
	currency.getBuffer()), currency.length()));
	}

	// Ugly hack. ICU doesn't expose numbering system in any way, so we have
	// to assume that for given locale NumberingSystem constructor produces the
	// same digits as NumberFormat would.
	UErrorCode status = U_ZERO_ERROR;
	icu::NumberingSystem* numbering_system =
	icu::NumberingSystem::createInstance(icu_locale, status);
	if (U_SUCCESS(status)) {
	const char* ns = numbering_system->getName();
	resolved->Set(v8::String::New("numberingSystem"), v8::String::New(ns));
	} else {
	resolved->Set(v8::String::New("numberingSystem"), v8::Undefined());
	}
	delete numbering_system;

	resolved->Set(v8::String::New("useGrouping"),
	v8::Boolean::New(number_format->isGroupingUsed()));

	resolved->Set(v8::String::New("minimumIntegerDigits"),
	v8::Integer::New(number_format->getMinimumIntegerDigits()));

	resolved->Set(v8::String::New("minimumFractionDigits"),
	v8::Integer::New(number_format->getMinimumFractionDigits()));

	resolved->Set(v8::String::New("maximumFractionDigits"),
	v8::Integer::New(number_format->getMaximumFractionDigits()));

	if (resolved->HasOwnProperty(v8::String::New("minimumSignificantDigits"))) {
	resolved->Set(v8::String::New("minimumSignificantDigits"), v8::Integer::New(
	number_format->getMinimumSignificantDigits()));
	}

	if (resolved->HasOwnProperty(v8::String::New("maximumSignificantDigits"))) {
	resolved->Set(v8::String::New("maximumSignificantDigits"), v8::Integer::New(
	number_format->getMaximumSignificantDigits()));
	}

	// Set the locale
	char result[ULOC_FULLNAME_CAPACITY];
	status = U_ZERO_ERROR;
	uloc_toLanguageTag(
	icu_locale.getName(), result, ULOC_FULLNAME_CAPACITY, FALSE, &status);
	if (U_SUCCESS(status)) {
	resolved->Set(v8::String::New("locale"), v8::String::New(result));
	} else {
	// This would never happen, since we got the locale from ICU.
	resolved->Set(v8::String::New("locale"), v8::String::New("und"));
	}
	}

	} // namespace v8_i18n