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// Copyright 2010 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
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// (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 "externalize-string-extension.h"
namespace v8 {
namespace internal {
template <typename Char, typename Base>
class SimpleStringResource : public Base {
public:
// Takes ownership of |data|.
SimpleStringResource(Char* data, size_t length)
: data_(data),
length_(length) {}
virtual ~SimpleStringResource() { delete[] data_; }
virtual const Char* data() const { return data_; }
virtual size_t length() const { return length_; }
private:
Char* const data_;
const size_t length_;
};
typedef SimpleStringResource<char, v8::String::ExternalAsciiStringResource>
SimpleAsciiStringResource;
typedef SimpleStringResource<uc16, v8::String::ExternalStringResource>
SimpleTwoByteStringResource;
const char* const ExternalizeStringExtension::kSource =
"native function externalizeString();"
"native function isAsciiString();";
v8::Handle<v8::FunctionTemplate> ExternalizeStringExtension::GetNativeFunction(
v8::Handle<v8::String> str) {
if (strcmp(*v8::String::AsciiValue(str), "externalizeString") == 0) {
return v8::FunctionTemplate::New(ExternalizeStringExtension::Externalize);
} else {
ASSERT(strcmp(*v8::String::AsciiValue(str), "isAsciiString") == 0);
return v8::FunctionTemplate::New(ExternalizeStringExtension::IsAscii);
}
}
v8::Handle<v8::Value> ExternalizeStringExtension::Externalize(
const v8::Arguments& args) {
if (args.Length() < 1 || !args[0]->IsString()) {
return v8::ThrowException(v8::String::New(
"First parameter to externalizeString() must be a string."));
}
bool force_two_byte = false;
if (args.Length() >= 2) {
if (args[1]->IsBoolean()) {
force_two_byte = args[1]->BooleanValue();
} else {
return v8::ThrowException(v8::String::New(
"Second parameter to externalizeString() must be a boolean."));
}
}
bool result = false;
Handle<String> string = Utils::OpenHandle(*args[0].As<v8::String>());
if (string->IsExternalString()) {
return v8::ThrowException(v8::String::New(
"externalizeString() can't externalize twice."));
}
if (string->IsAsciiRepresentation() && !force_two_byte) {
char* data = new char[string->length()];
String::WriteToFlat(*string, data, 0, string->length());
SimpleAsciiStringResource* resource = new SimpleAsciiStringResource(
data, string->length());
result = string->MakeExternal(resource);
if (result && !string->IsSymbol()) {
i::ExternalStringTable::AddString(*string);
}
if (!result) delete resource;
} else {
uc16* data = new uc16[string->length()];
String::WriteToFlat(*string, data, 0, string->length());
SimpleTwoByteStringResource* resource = new SimpleTwoByteStringResource(
data, string->length());
result = string->MakeExternal(resource);
if (result && !string->IsSymbol()) {
i::ExternalStringTable::AddString(*string);
}
if (!result) delete resource;
}
if (!result) {
return v8::ThrowException(v8::String::New("externalizeString() failed."));
}
return v8::Undefined();
}
v8::Handle<v8::Value> ExternalizeStringExtension::IsAscii(
const v8::Arguments& args) {
if (args.Length() != 1 || !args[0]->IsString()) {
return v8::ThrowException(v8::String::New(
"isAsciiString() requires a single string argument."));
}
return Utils::OpenHandle(*args[0].As<v8::String>())->IsAsciiRepresentation() ?
v8::True() : v8::False();
}
void ExternalizeStringExtension::Register() {
static ExternalizeStringExtension externalize_extension;
static v8::DeclareExtension externalize_extension_declaration(
&externalize_extension);
}
} } // namespace v8::internal