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OpaqueJSString.h
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109 lines (88 loc) · 3.66 KB
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/*
* Copyright (C) 2008 Apple 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:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``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 APPLE INC. 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 OpaqueJSString_h
#define OpaqueJSString_h
#include <atomic>
#include <wtf/ThreadSafeRefCounted.h>
#include <wtf/text/WTFString.h>
namespace JSC {
class Identifier;
class VM;
}
struct OpaqueJSString : public ThreadSafeRefCounted<OpaqueJSString> {
static Ref<OpaqueJSString> create()
{
return adoptRef(*new OpaqueJSString);
}
static Ref<OpaqueJSString> create(const LChar* characters, unsigned length)
{
return adoptRef(*new OpaqueJSString(characters, length));
}
static Ref<OpaqueJSString> create(const UChar* characters, unsigned length)
{
return adoptRef(*new OpaqueJSString(characters, length));
}
JS_EXPORT_PRIVATE static RefPtr<OpaqueJSString> tryCreate(const String&);
JS_EXPORT_PRIVATE static RefPtr<OpaqueJSString> tryCreate(String&&);
JS_EXPORT_PRIVATE ~OpaqueJSString();
bool is8Bit() { return m_string.is8Bit(); }
const LChar* characters8() { return m_string.characters8(); }
const UChar* characters16() { return m_string.characters16(); }
unsigned length() { return m_string.length(); }
const UChar* characters();
JS_EXPORT_PRIVATE String string() const;
JSC::Identifier identifier(JSC::VM*) const;
static bool equal(const OpaqueJSString*, const OpaqueJSString*);
private:
friend class WTF::ThreadSafeRefCounted<OpaqueJSString>;
OpaqueJSString()
: m_characters(nullptr)
{
}
OpaqueJSString(const String& string)
: m_string(string.isolatedCopy())
, m_characters(m_string.impl() && m_string.is8Bit() ? nullptr : const_cast<UChar*>(m_string.characters16()))
{
}
explicit OpaqueJSString(String&& string)
: m_string(WTFMove(string))
, m_characters(m_string.impl() && m_string.is8Bit() ? nullptr : const_cast<UChar*>(m_string.characters16()))
{
}
OpaqueJSString(const LChar* characters, unsigned length)
: m_string(characters, length)
, m_characters(nullptr)
{
}
OpaqueJSString(const UChar* characters, unsigned length)
: m_string(characters, length)
, m_characters(m_string.impl() && m_string.is8Bit() ? nullptr : const_cast<UChar*>(m_string.characters16()))
{
}
String m_string;
// This will be initialized on demand when characters() is called if the string needs up-conversion.
std::atomic<UChar*> m_characters;
};
#endif