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/*
* Copyright (C) 2012 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. AND ITS 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 APPLE INC. OR ITS 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 PropertyName_h
#define PropertyName_h
#include "Identifier.h"
#include "PrivateName.h"
namespace JSC {
template <typename CharType>
ALWAYS_INLINE uint32_t toUInt32FromCharacters(const CharType* characters, unsigned length)
{
// An empty string is not a number.
if (!length)
return UINT_MAX;
// Get the first character, turning it into a digit.
uint32_t value = characters[0] - '0';
if (value > 9)
return UINT_MAX;
// Check for leading zeros. If the first characher is 0, then the
// length of the string must be one - e.g. "042" is not equal to "42".
if (!value && length > 1)
return UINT_MAX;
while (--length) {
// Multiply value by 10, checking for overflow out of 32 bits.
if (value > 0xFFFFFFFFU / 10)
return UINT_MAX;
value *= 10;
// Get the next character, turning it into a digit.
uint32_t newValue = *(++characters) - '0';
if (newValue > 9)
return UINT_MAX;
// Add in the old value, checking for overflow out of 32 bits.
newValue += value;
if (newValue < value)
return UINT_MAX;
value = newValue;
}
return value;
}
ALWAYS_INLINE uint32_t toUInt32FromStringImpl(StringImpl* impl)
{
if (impl->is8Bit())
return toUInt32FromCharacters(impl->characters8(), impl->length());
return toUInt32FromCharacters(impl->characters16(), impl->length());
}
class PropertyName {
public:
PropertyName(const Identifier& propertyName)
: m_impl(propertyName.impl())
{
ASSERT(!m_impl || m_impl->isIdentifier());
}
PropertyName(const PrivateName& propertyName)
: m_impl(propertyName.uid())
{
ASSERT(m_impl && m_impl->isEmptyUnique());
}
StringImpl* uid() const
{
ASSERT(!m_impl || (m_impl->isIdentifier() == !m_impl->isEmptyUnique()));
return m_impl;
}
StringImpl* publicName() const
{
ASSERT(!m_impl || (m_impl->isIdentifier() == !m_impl->isEmptyUnique()));
return m_impl->isIdentifier() ? m_impl : 0;
}
static const uint32_t NotAnIndex = UINT_MAX;
uint32_t asIndex()
{
ASSERT(!m_impl || (m_impl->isIdentifier() == !m_impl->isEmptyUnique()));
return m_impl ? toUInt32FromStringImpl(m_impl) : NotAnIndex;
}
private:
StringImpl* m_impl;
};
inline bool operator==(PropertyName a, const Identifier& b)
{
return a.uid() == b.impl();
}
inline bool operator==(const Identifier& a, PropertyName b)
{
return a.impl() == b.uid();
}
inline bool operator==(PropertyName a, PropertyName b)
{
return a.uid() == b.uid();
}
inline bool operator!=(PropertyName a, const Identifier& b)
{
return a.uid() != b.impl();
}
inline bool operator!=(const Identifier& a, PropertyName b)
{
return a.impl() != b.uid();
}
inline bool operator!=(PropertyName a, PropertyName b)
{
return a.uid() != b.uid();
}
}
#endif
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