Import the v8-i18n extension into v8

src/extensions/i18n/number-format.cc

+// Copyright 2013 the V8 project authors. All rights reserved.
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+//       notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+//       copyright notice, this list of conditions and the following
+//       disclaimer in the documentation and/or other materials provided
+//       with the distribution.
+//     * Neither the name of Google Inc. nor the names of its
+//       contributors may be used to endorse or promote products derived
+//       from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+// limitations under the License.
+
+#include "number-format.h"
+
+#include <string.h>
+
+#include "i18n-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);
+}
+
+void NumberFormat::JSInternalFormat(
+    const v8::FunctionCallbackInfo<v8::Value>& args) {
+  if (args.Length() != 2 || !args[0]->IsObject() || !args[1]->IsNumber()) {
+    v8::ThrowException(v8::Exception::Error(
+        v8::String::New("Formatter and numeric value have to be specified.")));
+    return;
+  }
+
+  icu::DecimalFormat* number_format = UnpackNumberFormat(args[0]->ToObject());
+  if (!number_format) {
+    v8::ThrowException(v8::Exception::Error(
+        v8::String::New("NumberFormat method called on an object "
+                        "that is not a NumberFormat.")));
+    return;
+  }
+
+  // ICU will handle actual NaN value properly and return NaN string.
+  icu::UnicodeString result;
+  number_format->format(args[1]->NumberValue(), result);
+
+  args.GetReturnValue().Set(v8::String::New(
+      reinterpret_cast<const uint16_t*>(result.getBuffer()), result.length()));
+}
+
+void NumberFormat::JSInternalParse(
+    const v8::FunctionCallbackInfo<v8::Value>& args) {
+  if (args.Length() != 2 || !args[0]->IsObject() || !args[1]->IsString()) {
+    v8::ThrowException(v8::Exception::Error(
+        v8::String::New("Formatter and string have to be specified.")));
+    return;
+  }
+
+  icu::DecimalFormat* number_format = UnpackNumberFormat(args[0]->ToObject());
+  if (!number_format) {
+    v8::ThrowException(v8::Exception::Error(
+        v8::String::New("NumberFormat method called on an object "
+                        "that is not a NumberFormat.")));
+    return;
+  }
+
+  // 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;
+  }
+
+  switch (result.getType()) {
+  case icu::Formattable::kDouble:
+    args.GetReturnValue().Set(result.getDouble());
+    return;
+  case icu::Formattable::kLong:
+    args.GetReturnValue().Set(v8::Number::New(result.getLong()));
+    return;
+  case icu::Formattable::kInt64:
+    args.GetReturnValue().Set(v8::Number::New(result.getInt64()));
+    return;
+  default:
+    return;
+  }
+}
+
+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);
+  }
+
+  bool significant_digits_used = false;
+  if (Utils::ExtractIntegerSetting(
+          options, "minimumSignificantDigits", &digits)) {
+    number_format->setMinimumSignificantDigits(digits);
+    significant_digits_used = true;
+  }
+
+  if (Utils::ExtractIntegerSetting(
+          options, "maximumSignificantDigits", &digits)) {
+    number_format->setMaximumSignificantDigits(digits);
+    significant_digits_used = true;
+  }
+
+  number_format->setSignificantDigitsUsed(significant_digits_used);
+
+  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