Import the v8-i18n extension into v8

src/extensions/i18n/break-iterator.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.
+
+#include "break-iterator.h"
+
+#include <string.h>
+
+#include "i18n-utils.h"
+#include "unicode/brkiter.h"
+#include "unicode/locid.h"
+#include "unicode/rbbi.h"
+
+namespace v8_i18n {
+
+static v8::Handle<v8::Value> ThrowUnexpectedObjectError();
+static icu::UnicodeString* ResetAdoptedText(v8::Handle<v8::Object>,
+                                            v8::Handle<v8::Value>);
+static icu::BreakIterator* InitializeBreakIterator(v8::Handle<v8::String>,
+                                                   v8::Handle<v8::Object>,
+                                                   v8::Handle<v8::Object>);
+static icu::BreakIterator* CreateICUBreakIterator(const icu::Locale&,
+                                                  v8::Handle<v8::Object>);
+static void SetResolvedSettings(const icu::Locale&,
+                                icu::BreakIterator*,
+                                v8::Handle<v8::Object>);
+
+icu::BreakIterator* BreakIterator::UnpackBreakIterator(
+    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 BreakIterator 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("breakIterator"))) {
+    return static_cast<icu::BreakIterator*>(
+        obj->GetAlignedPointerFromInternalField(0));
+  }
+
+  return NULL;
+}
+
+void BreakIterator::DeleteBreakIterator(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 break iterator.
+  v8::HandleScope handle_scope(isolate);
+  v8::Local<v8::Object> handle = v8::Local<v8::Object>::New(isolate, *object);
+  delete UnpackBreakIterator(handle);
+
+  delete static_cast<icu::UnicodeString*>(
+      handle->GetAlignedPointerFromInternalField(1));
+
+  // Then dispose of the persistent handle to JS object.
+  object->Dispose(isolate);
+}
+
+// Throws a JavaScript exception.
+static v8::Handle<v8::Value> ThrowUnexpectedObjectError() {
+  // Returns undefined, and schedules an exception to be thrown.
+  return v8::ThrowException(v8::Exception::Error(
+      v8::String::New("BreakIterator method called on an object "
+                      "that is not a BreakIterator.")));
+}
+
+// Deletes the old value and sets the adopted text in corresponding
+// JavaScript object.
+icu::UnicodeString* ResetAdoptedText(
+    v8::Handle<v8::Object> obj, v8::Handle<v8::Value> value) {
+  // Get the previous value from the internal field.
+  icu::UnicodeString* text = static_cast<icu::UnicodeString*>(
+      obj->GetAlignedPointerFromInternalField(1));
+  delete text;
+
+  // Assign new value to the internal pointer.
+  v8::String::Value text_value(value);
+  text = new icu::UnicodeString(
+      reinterpret_cast<const UChar*>(*text_value), text_value.length());
+  obj->SetAlignedPointerInInternalField(1, text);
+
+  // Return new unicode string pointer.
+  return text;
+}
+
+void BreakIterator::JSInternalBreakIteratorAdoptText(
+    const v8::FunctionCallbackInfo<v8::Value>& args) {
+  if (args.Length() != 2 || !args[0]->IsObject() || !args[1]->IsString()) {
+    v8::ThrowException(v8::Exception::Error(
+        v8::String::New(
+            "Internal error. Iterator and text have to be specified.")));
+    return;
+  }
+
+  icu::BreakIterator* break_iterator = UnpackBreakIterator(args[0]->ToObject());
+  if (!break_iterator) {
+    ThrowUnexpectedObjectError();
+    return;
+  }
+
+  break_iterator->setText(*ResetAdoptedText(args[0]->ToObject(), args[1]));
+}
+
+void BreakIterator::JSInternalBreakIteratorFirst(
+    const v8::FunctionCallbackInfo<v8::Value>& args) {
+  icu::BreakIterator* break_iterator = UnpackBreakIterator(args[0]->ToObject());
+  if (!break_iterator) {
+    ThrowUnexpectedObjectError();
+    return;
+  }
+
+  args.GetReturnValue().Set(static_cast<int32_t>(break_iterator->first()));
+}
+
+void BreakIterator::JSInternalBreakIteratorNext(
+    const v8::FunctionCallbackInfo<v8::Value>& args) {
+  icu::BreakIterator* break_iterator = UnpackBreakIterator(args[0]->ToObject());
+  if (!break_iterator) {
+    ThrowUnexpectedObjectError();
+    return;
+  }
+
+  args.GetReturnValue().Set(static_cast<int32_t>(break_iterator->next()));
+}
+
+void BreakIterator::JSInternalBreakIteratorCurrent(
+    const v8::FunctionCallbackInfo<v8::Value>& args) {
+  icu::BreakIterator* break_iterator = UnpackBreakIterator(args[0]->ToObject());
+  if (!break_iterator) {
+    ThrowUnexpectedObjectError();
+    return;
+  }
+
+  args.GetReturnValue().Set(static_cast<int32_t>(break_iterator->current()));
+}
+
+void BreakIterator::JSInternalBreakIteratorBreakType(
+    const v8::FunctionCallbackInfo<v8::Value>& args) {
+  icu::BreakIterator* break_iterator = UnpackBreakIterator(args[0]->ToObject());
+  if (!break_iterator) {
+    ThrowUnexpectedObjectError();
+    return;
+  }
+
+  // TODO(cira): Remove cast once ICU fixes base BreakIterator class.
+  icu::RuleBasedBreakIterator* rule_based_iterator =
+      static_cast<icu::RuleBasedBreakIterator*>(break_iterator);
+  int32_t status = rule_based_iterator->getRuleStatus();
+  // Keep return values in sync with JavaScript BreakType enum.
+  v8::Handle<v8::String> result;
+  if (status >= UBRK_WORD_NONE && status < UBRK_WORD_NONE_LIMIT) {
+    result = v8::String::New("none");
+  } else if (status >= UBRK_WORD_NUMBER && status < UBRK_WORD_NUMBER_LIMIT) {
+    result = v8::String::New("number");
+  } else if (status >= UBRK_WORD_LETTER && status < UBRK_WORD_LETTER_LIMIT) {
+    result = v8::String::New("letter");
+  } else if (status >= UBRK_WORD_KANA && status < UBRK_WORD_KANA_LIMIT) {
+    result = v8::String::New("kana");
+  } else if (status >= UBRK_WORD_IDEO && status < UBRK_WORD_IDEO_LIMIT) {
+    result = v8::String::New("ideo");
+  } else {
+    result = v8::String::New("unknown");
+  }
+  args.GetReturnValue().Set(result);
+}
+
+void BreakIterator::JSCreateBreakIterator(
+    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> break_iterator_template =
+      Utils::GetTemplate2(isolate);
+
+  // Create an empty object wrapper.
+  v8::Local<v8::Object> local_object = break_iterator_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 break iterator as internal field of the resulting JS object.
+  icu::BreakIterator* break_iterator = InitializeBreakIterator(
+      args[0]->ToString(), args[1]->ToObject(), args[2]->ToObject());
+
+  if (!break_iterator) {
+    v8::ThrowException(v8::Exception::Error(v8::String::New(
+        "Internal error. Couldn't create ICU break iterator.")));
+    return;
+  } else {
+    local_object->SetAlignedPointerInInternalField(0, break_iterator);
+    // Make sure that the pointer to adopted text is NULL.
+    local_object->SetAlignedPointerInInternalField(1, NULL);
+
+    v8::TryCatch try_catch;
+    local_object->Set(v8::String::New("breakIterator"),
+                      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, &DeleteBreakIterator);
+  args.GetReturnValue().Set(wrapper);
+  wrapper.ClearAndLeak();
+}
+
+static icu::BreakIterator* InitializeBreakIterator(
+    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::BreakIterator* break_iterator =
+    CreateICUBreakIterator(icu_locale, options);
+  if (!break_iterator) {
+    // Remove extensions and try again.
+    icu::Locale no_extension_locale(icu_locale.getBaseName());
+    break_iterator = CreateICUBreakIterator(no_extension_locale, options);
+
+    // Set resolved settings (locale).
+    SetResolvedSettings(no_extension_locale, break_iterator, resolved);
+  } else {
+    SetResolvedSettings(icu_locale, break_iterator, resolved);
+  }
+
+  return break_iterator;
+}
+
+static icu::BreakIterator* CreateICUBreakIterator(
+    const icu::Locale& icu_locale, v8::Handle<v8::Object> options) {
+  UErrorCode status = U_ZERO_ERROR;
+  icu::BreakIterator* break_iterator = NULL;
+  icu::UnicodeString type;
+  if (!Utils::ExtractStringSetting(options, "type", &type)) {
+    // Type had to be in the options. This would be an internal error.
+    return NULL;
+  }
+
+  if (type == UNICODE_STRING_SIMPLE("character")) {
+    break_iterator =
+      icu::BreakIterator::createCharacterInstance(icu_locale, status);
+  } else if (type == UNICODE_STRING_SIMPLE("sentence")) {
+    break_iterator =
+      icu::BreakIterator::createSentenceInstance(icu_locale, status);
+  } else if (type == UNICODE_STRING_SIMPLE("line")) {
+    break_iterator =
+      icu::BreakIterator::createLineInstance(icu_locale, status);
+  } else {
+    // Defualt is word iterator.
+    break_iterator =
+      icu::BreakIterator::createWordInstance(icu_locale, status);
+  }
+
+  if (U_FAILURE(status)) {
+    delete break_iterator;
+    return NULL;
+  }
+
+  return break_iterator;
+}
+
+static void SetResolvedSettings(const icu::Locale& icu_locale,
+                                icu::BreakIterator* date_format,
+                                v8::Handle<v8::Object> resolved) {
+  UErrorCode status = U_ZERO_ERROR;
+
+  // 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