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// Copyright 2011 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 "unicode/brkiter.h"
#include "unicode/locid.h"
#include "unicode/rbbi.h"
namespace v8 {
namespace internal {
v8::Persistent<v8::FunctionTemplate> BreakIterator::break_iterator_template_;
icu::BreakIterator* BreakIterator::UnpackBreakIterator(
v8::Handle<v8::Object> obj) {
if (break_iterator_template_->HasInstance(obj)) {
return static_cast<icu::BreakIterator*>(
obj->GetPointerFromInternalField(0));
}
return NULL;
}
icu::UnicodeString* BreakIterator::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->GetPointerFromInternalField(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->SetPointerInInternalField(1, text);
// Return new unicode string pointer.
return text;
}
void BreakIterator::DeleteBreakIterator(v8::Persistent<v8::Value> object,
void* param) {
v8::Persistent<v8::Object> persistent_object =
v8::Persistent<v8::Object>::Cast(object);
// 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.
delete UnpackBreakIterator(persistent_object);
delete static_cast<icu::UnicodeString*>(
persistent_object->GetPointerFromInternalField(1));
// Then dispose of the persistent handle to JS object.
persistent_object.Dispose();
}
// 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.")));
}
v8::Handle<v8::Value> BreakIterator::BreakIteratorAdoptText(
const v8::Arguments& args) {
if (args.Length() != 1 || !args[0]->IsString()) {
return v8::ThrowException(v8::Exception::SyntaxError(
v8::String::New("Text input is required.")));
}
icu::BreakIterator* break_iterator = UnpackBreakIterator(args.Holder());
if (!break_iterator) {
return ThrowUnexpectedObjectError();
}
break_iterator->setText(*ResetAdoptedText(args.Holder(), args[0]));
return v8::Undefined();
}
v8::Handle<v8::Value> BreakIterator::BreakIteratorFirst(
const v8::Arguments& args) {
icu::BreakIterator* break_iterator = UnpackBreakIterator(args.Holder());
if (!break_iterator) {
return ThrowUnexpectedObjectError();
}
return v8::Int32::New(break_iterator->first());
}
v8::Handle<v8::Value> BreakIterator::BreakIteratorNext(
const v8::Arguments& args) {
icu::BreakIterator* break_iterator = UnpackBreakIterator(args.Holder());
if (!break_iterator) {
return ThrowUnexpectedObjectError();
}
return v8::Int32::New(break_iterator->next());
}
v8::Handle<v8::Value> BreakIterator::BreakIteratorCurrent(
const v8::Arguments& args) {
icu::BreakIterator* break_iterator = UnpackBreakIterator(args.Holder());
if (!break_iterator) {
return ThrowUnexpectedObjectError();
}
return v8::Int32::New(break_iterator->current());
}
v8::Handle<v8::Value> BreakIterator::BreakIteratorBreakType(
const v8::Arguments& args) {
icu::BreakIterator* break_iterator = UnpackBreakIterator(args.Holder());
if (!break_iterator) {
return ThrowUnexpectedObjectError();
}
// 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.
if (status >= UBRK_WORD_NONE && status < UBRK_WORD_NONE_LIMIT) {
return v8::Int32::New(UBRK_WORD_NONE);
} else if (status >= UBRK_WORD_NUMBER && status < UBRK_WORD_NUMBER_LIMIT) {
return v8::Int32::New(UBRK_WORD_NUMBER);
} else if (status >= UBRK_WORD_LETTER && status < UBRK_WORD_LETTER_LIMIT) {
return v8::Int32::New(UBRK_WORD_LETTER);
} else if (status >= UBRK_WORD_KANA && status < UBRK_WORD_KANA_LIMIT) {
return v8::Int32::New(UBRK_WORD_KANA);
} else if (status >= UBRK_WORD_IDEO && status < UBRK_WORD_IDEO_LIMIT) {
return v8::Int32::New(UBRK_WORD_IDEO);
} else {
return v8::Int32::New(-1);
}
}
v8::Handle<v8::Value> BreakIterator::JSBreakIterator(
const v8::Arguments& args) {
v8::HandleScope handle_scope;
if (args.Length() != 2 || !args[0]->IsString() || !args[1]->IsString()) {
return v8::ThrowException(v8::Exception::SyntaxError(
v8::String::New("Locale and iterator type are required.")));
}
v8::String::Utf8Value locale(args[0]);
icu::Locale icu_locale(*locale);
UErrorCode status = U_ZERO_ERROR;
icu::BreakIterator* break_iterator = NULL;
v8::String::Utf8Value type(args[1]);
if (!strcmp(*type, "character")) {
break_iterator =
icu::BreakIterator::createCharacterInstance(icu_locale, status);
} else if (!strcmp(*type, "word")) {
break_iterator =
icu::BreakIterator::createWordInstance(icu_locale, status);
} else if (!strcmp(*type, "sentence")) {
break_iterator =
icu::BreakIterator::createSentenceInstance(icu_locale, status);
} else if (!strcmp(*type, "line")) {
break_iterator =
icu::BreakIterator::createLineInstance(icu_locale, status);
} else {
return v8::ThrowException(v8::Exception::SyntaxError(
v8::String::New("Invalid iterator type.")));
}
if (U_FAILURE(status)) {
delete break_iterator;
return v8::ThrowException(v8::Exception::Error(
v8::String::New("Failed to create break iterator.")));
}
if (break_iterator_template_.IsEmpty()) {
v8::Local<v8::FunctionTemplate> raw_template(v8::FunctionTemplate::New());
raw_template->SetClassName(v8::String::New("v8Locale.v8BreakIterator"));
// Define internal field count on instance template.
v8::Local<v8::ObjectTemplate> object_template =
raw_template->InstanceTemplate();
// Set aside internal fields for icu break iterator and adopted text.
object_template->SetInternalFieldCount(2);
// Define all of the prototype methods on prototype template.
v8::Local<v8::ObjectTemplate> proto = raw_template->PrototypeTemplate();
proto->Set(v8::String::New("adoptText"),
v8::FunctionTemplate::New(BreakIteratorAdoptText));
proto->Set(v8::String::New("first"),
v8::FunctionTemplate::New(BreakIteratorFirst));
proto->Set(v8::String::New("next"),
v8::FunctionTemplate::New(BreakIteratorNext));
proto->Set(v8::String::New("current"),
v8::FunctionTemplate::New(BreakIteratorCurrent));
proto->Set(v8::String::New("breakType"),
v8::FunctionTemplate::New(BreakIteratorBreakType));
break_iterator_template_ =
v8::Persistent<v8::FunctionTemplate>::New(raw_template);
}
// Create an empty object wrapper.
v8::Local<v8::Object> local_object =
break_iterator_template_->GetFunction()->NewInstance();
v8::Persistent<v8::Object> wrapper =
v8::Persistent<v8::Object>::New(local_object);
// Set break iterator as internal field of the resulting JS object.
wrapper->SetPointerInInternalField(0, break_iterator);
// Make sure that the pointer to adopted text is NULL.
wrapper->SetPointerInInternalField(1, NULL);
// Make object handle weak so we can delete iterator once GC kicks in.
wrapper.MakeWeak(NULL, DeleteBreakIterator);
return wrapper;
}
} } // namespace v8::internal