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/*
* Copyright (C) 2009 Google Inc. 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.
*/
#ifndef V8Binding_h
#define V8Binding_h
#include "AtomicString.h"
#include "MathExtras.h"
#include "PlatformString.h"
#include <v8.h>
namespace WebCore {
// Convert v8 types to a WebCore::String. If the V8 string is not already
// an external string then it is transformed into an external string at this
// point to avoid repeated conversions.
String v8StringToWebCoreString(v8::Handle<v8::String>);
String v8NonStringValueToWebCoreString(v8::Handle<v8::Value>);
inline String v8ValueToWebCoreString(v8::Handle<v8::Value> value)
{
if (value->IsString())
return v8StringToWebCoreString(v8::Handle<v8::String>::Cast(value));
return v8NonStringValueToWebCoreString(value);
}
// Convert v8 types to a WebCore::AtomicString.
AtomicString v8StringToAtomicWebCoreString(v8::Handle<v8::String>);
AtomicString v8NonStringValueToAtomicWebCoreString(v8::Handle<v8::Value>);
inline AtomicString v8ValueToAtomicWebCoreString(v8::Handle<v8::Value> value)
{
if (value->IsString())
return v8StringToAtomicWebCoreString(v8::Handle<v8::String>::Cast(value));
return v8NonStringValueToAtomicWebCoreString(value);
}
inline String toString(const String& string)
{
return string;
}
// Return a V8 external string that shares the underlying buffer with the given
// WebCore string. The reference counting mechanism is used to keep the
// underlying buffer alive while the string is still live in the V8 engine.
v8::Local<v8::String> v8ExternalString(const String&);
// Convert a string to a V8 string.
inline v8::Handle<v8::String> v8String(const String& string)
{
return v8ExternalString(string);
}
// Enables caching v8 wrappers created for WebCore::StringImpl. Currently this cache requires
// all the calls (both to convert WebCore::String to v8::String and to GC the handle)
// to be performed on the main thread.
void enableStringImplCache();
// Convert a value to a 32-bit integer. The conversion fails if the
// value cannot be converted to an integer or converts to nan or to an infinity.
inline int toInt32(v8::Handle<v8::Value> value, bool& ok)
{
ok = true;
// Fast case. The value is already a 32-bit integer.
if (value->IsInt32())
return value->Int32Value();
// Can the value be converted to a number?
v8::Local<v8::Number> numberObject = value->ToNumber();
if (numberObject.IsEmpty()) {
ok = false;
return 0;
}
// Does the value convert to nan or to an infinity?
double numberValue = numberObject->Value();
if (isnan(numberValue) || isinf(numberValue)) {
ok = false;
return 0;
}
// Can the value be converted to a 32-bit integer?
v8::Local<v8::Int32> intValue = value->ToInt32();
if (intValue.IsEmpty()) {
ok = false;
return 0;
}
// Return the result of the int32 conversion.
return intValue->Value();
}
// Convert a value to a 32-bit integer assuming the conversion cannot fail.
inline int toInt32(v8::Handle<v8::Value> value)
{
bool ok;
return toInt32(value, ok);
}
inline float toFloat(v8::Local<v8::Value> value)
{
return static_cast<float>(value->NumberValue());
}
// FIXME: Drop this in favor of the type specific v8ValueToWebCoreString when we rework the code generation.
inline String toWebCoreString(v8::Handle<v8::Value> object)
{
return v8ValueToWebCoreString(object);
}
// The string returned by this function is still owned by the argument
// and will be deallocated when the argument is deallocated.
inline const uint16_t* fromWebCoreString(const String& str)
{
return reinterpret_cast<const uint16_t*>(str.characters());
}
inline bool isUndefinedOrNull(v8::Handle<v8::Value> value)
{
return value->IsNull() || value->IsUndefined();
}
inline v8::Handle<v8::Boolean> v8Boolean(bool value)
{
return value ? v8::True() : v8::False();
}
inline String toWebCoreStringWithNullCheck(v8::Handle<v8::Value> value)
{
if (value->IsNull())
return String();
return v8ValueToWebCoreString(value);
}
inline AtomicString v8ValueToAtomicWebCoreStringWithNullCheck(v8::Handle<v8::Value> value)
{
if (value->IsNull())
return AtomicString();
return v8ValueToAtomicWebCoreString(value);
}
inline String toWebCoreStringWithNullOrUndefinedCheck(v8::Handle<v8::Value> value)
{
if (value->IsNull() || value->IsUndefined())
return String();
return toWebCoreString(value);
}
inline v8::Handle<v8::String> v8UndetectableString(const String& str)
{
return v8::String::NewUndetectable(fromWebCoreString(str), str.length());
}
inline v8::Handle<v8::Value> v8StringOrNull(const String& str)
{
return str.isNull() ? v8::Handle<v8::Value>(v8::Null()) : v8::Handle<v8::Value>(v8String(str));
}
inline v8::Handle<v8::Value> v8StringOrUndefined(const String& str)
{
return str.isNull() ? v8::Handle<v8::Value>(v8::Undefined()) : v8::Handle<v8::Value>(v8String(str));
}
inline v8::Handle<v8::Value> v8StringOrFalse(const String& str)
{
return str.isNull() ? v8::Handle<v8::Value>(v8::False()) : v8::Handle<v8::Value>(v8String(str));
}
} // namespace WebCore
#endif // V8Binding_h
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