Import the v8-i18n extension into v8

src/extensions/i18n/date-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 "date-format.h"
+
+#include <string.h>
+
+#include "i18n-utils.h"
+#include "unicode/calendar.h"
+#include "unicode/dtfmtsym.h"
+#include "unicode/dtptngen.h"
+#include "unicode/locid.h"
+#include "unicode/numsys.h"
+#include "unicode/smpdtfmt.h"
+#include "unicode/timezone.h"
+
+namespace v8_i18n {
+
+static icu::SimpleDateFormat* InitializeDateTimeFormat(v8::Handle<v8::String>,
+                                                       v8::Handle<v8::Object>,
+                                                       v8::Handle<v8::Object>);
+static icu::SimpleDateFormat* CreateICUDateFormat(const icu::Locale&,
+                                                  v8::Handle<v8::Object>);
+static void SetResolvedSettings(const icu::Locale&,
+                                icu::SimpleDateFormat*,
+                                v8::Handle<v8::Object>);
+
+icu::SimpleDateFormat* DateFormat::UnpackDateFormat(
+    v8::Handle<v8::Object> obj) {
+  v8::HandleScope handle_scope;
+
+  if (obj->HasOwnProperty(v8::String::New("dateFormat"))) {
+    return static_cast<icu::SimpleDateFormat*>(
+        obj->GetAlignedPointerFromInternalField(0));
+  }
+
+  return NULL;
+}
+
+void DateFormat::DeleteDateFormat(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 UnpackDateFormat(handle);
+
+  // Then dispose of the persistent handle to JS object.
+  object->Dispose(isolate);
+}
+
+void DateFormat::JSInternalFormat(
+    const v8::FunctionCallbackInfo<v8::Value>& args) {
+  double millis = 0.0;
+  if (args.Length() != 2 || !args[0]->IsObject() || !args[1]->IsDate()) {
+    v8::ThrowException(v8::Exception::Error(
+        v8::String::New(
+            "Internal error. Formatter and date value have to be specified.")));
+    return;
+  } else {
+    millis = v8::Date::Cast(*args[1])->NumberValue();
+  }
+
+  icu::SimpleDateFormat* date_format = UnpackDateFormat(args[0]->ToObject());
+  if (!date_format) {
+    v8::ThrowException(v8::Exception::Error(
+        v8::String::New("DateTimeFormat method called on an object "
+                        "that is not a DateTimeFormat.")));
+    return;
+  }
+
+  icu::UnicodeString result;
+  date_format->format(millis, result);
+
+  args.GetReturnValue().Set(v8::String::New(
+      reinterpret_cast<const uint16_t*>(result.getBuffer()), result.length()));
+}
+
+void DateFormat::JSInternalParse(
+    const v8::FunctionCallbackInfo<v8::Value>& args) {
+  icu::UnicodeString string_date;
+  if (args.Length() != 2 || !args[0]->IsObject() || !args[1]->IsString()) {
+    v8::ThrowException(v8::Exception::Error(
+        v8::String::New(
+            "Internal error. Formatter and string have to be specified.")));
+    return;
+  } else {
+    if (!Utils::V8StringToUnicodeString(args[1], &string_date)) {
+      string_date = "";
+    }
+  }
+
+  icu::SimpleDateFormat* date_format = UnpackDateFormat(args[0]->ToObject());
+  if (!date_format) {
+    v8::ThrowException(v8::Exception::Error(
+        v8::String::New("DateTimeFormat method called on an object "
+                        "that is not a DateTimeFormat.")));
+    return;
+  }
+
+  UErrorCode status = U_ZERO_ERROR;
+  UDate date = date_format->parse(string_date, status);
+  if (U_FAILURE(status)) {
+    return;
+  }
+
+  args.GetReturnValue().Set(v8::Date::New(static_cast<double>(date)));
+}
+
+void DateFormat::JSCreateDateTimeFormat(
+    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> date_format_template =
+      Utils::GetTemplate(isolate);
+
+  // Create an empty object wrapper.
+  v8::Local<v8::Object> local_object = date_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 date time formatter as internal field of the resulting JS object.
+  icu::SimpleDateFormat* date_format = InitializeDateTimeFormat(
+      args[0]->ToString(), args[1]->ToObject(), args[2]->ToObject());
+
+  if (!date_format) {
+    v8::ThrowException(v8::Exception::Error(v8::String::New(
+        "Internal error. Couldn't create ICU date time formatter.")));
+    return;
+  } else {
+    local_object->SetAlignedPointerInInternalField(0, date_format);
+
+    v8::TryCatch try_catch;
+    local_object->Set(v8::String::New("dateFormat"), 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, &DeleteDateFormat);
+  args.GetReturnValue().Set(wrapper);
+  wrapper.ClearAndLeak();
+}
+
+static icu::SimpleDateFormat* InitializeDateTimeFormat(
+    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::SimpleDateFormat* date_format = CreateICUDateFormat(icu_locale, options);
+  if (!date_format) {
+    // Remove extensions and try again.
+    icu::Locale no_extension_locale(icu_locale.getBaseName());
+    date_format = CreateICUDateFormat(no_extension_locale, options);
+
+    // Set resolved settings (pattern, numbering system, calendar).
+    SetResolvedSettings(no_extension_locale, date_format, resolved);
+  } else {
+    SetResolvedSettings(icu_locale, date_format, resolved);
+  }
+
+  return date_format;
+}
+
+static icu::SimpleDateFormat* CreateICUDateFormat(
+    const icu::Locale& icu_locale, v8::Handle<v8::Object> options) {
+  // Create time zone as specified by the user. We have to re-create time zone
+  // since calendar takes ownership.
+  icu::TimeZone* tz = NULL;
+  icu::UnicodeString timezone;
+  if (Utils::ExtractStringSetting(options, "timeZone", &timezone)) {
+    tz = icu::TimeZone::createTimeZone(timezone);
+  } else {
+    tz = icu::TimeZone::createDefault();
+  }
+
+  // Create a calendar using locale, and apply time zone to it.
+  UErrorCode status = U_ZERO_ERROR;
+  icu::Calendar* calendar =
+      icu::Calendar::createInstance(tz, icu_locale, status);
+
+  // Make formatter from skeleton. Calendar and numbering system are added
+  // to the locale as Unicode extension (if they were specified at all).
+  icu::SimpleDateFormat* date_format = NULL;
+  icu::UnicodeString skeleton;
+  if (Utils::ExtractStringSetting(options, "skeleton", &skeleton)) {
+    icu::DateTimePatternGenerator* generator =
+        icu::DateTimePatternGenerator::createInstance(icu_locale, status);
+    icu::UnicodeString pattern;
+    if (U_SUCCESS(status)) {
+      pattern = generator->getBestPattern(skeleton, status);
+      delete generator;
+    }
+
+    date_format = new icu::SimpleDateFormat(pattern, icu_locale, status);
+    if (U_SUCCESS(status)) {
+      date_format->adoptCalendar(calendar);
+    }
+  }
+
+  if (U_FAILURE(status)) {
+    delete calendar;
+    delete date_format;
+    date_format = NULL;
+  }
+
+  return date_format;
+}
+
+static void SetResolvedSettings(const icu::Locale& icu_locale,
+                                icu::SimpleDateFormat* date_format,
+                                v8::Handle<v8::Object> resolved) {
+  UErrorCode status = U_ZERO_ERROR;
+  icu::UnicodeString pattern;
+  date_format->toPattern(pattern);
+  resolved->Set(v8::String::New("pattern"),
+                v8::String::New(reinterpret_cast<const uint16_t*>(
+                    pattern.getBuffer()), pattern.length()));
+
+  // Set time zone and calendar.
+  if (date_format) {
+    const icu::Calendar* calendar = date_format->getCalendar();
+    const char* calendar_name = calendar->getType();
+    resolved->Set(v8::String::New("calendar"), v8::String::New(calendar_name));
+
+    const icu::TimeZone& tz = calendar->getTimeZone();
+    icu::UnicodeString time_zone;
+    tz.getID(time_zone);
+
+    icu::UnicodeString canonical_time_zone;
+    icu::TimeZone::getCanonicalID(time_zone, canonical_time_zone, status);
+    if (U_SUCCESS(status)) {
+      if (canonical_time_zone == UNICODE_STRING_SIMPLE("Etc/GMT")) {
+        resolved->Set(v8::String::New("timeZone"), v8::String::New("UTC"));
+      } else {
+        resolved->Set(v8::String::New("timeZone"),
+                      v8::String::New(reinterpret_cast<const uint16_t*>(
+                          canonical_time_zone.getBuffer()),
+                                      canonical_time_zone.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/Calendar would.
+  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;
+
+  // 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