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/*
* Copyright (C) 2009, 2010 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 StringBuilder_h
#define StringBuilder_h
#include <wtf/Vector.h>
#include <wtf/text/WTFString.h>
namespace WTF {
class StringBuilder {
public:
StringBuilder()
: m_length(0)
{
}
void append(const UChar*, unsigned);
void append(const char*, unsigned);
void append(const String& string)
{
// If we're appending to an empty string, and there is not buffer
// (in case reserveCapacity has been called) then just retain the
// string.
if (!m_length && !m_buffer) {
m_string = string;
m_length = string.length();
return;
}
append(string.characters(), string.length());
}
void append(const char* characters)
{
if (characters)
append(characters, strlen(characters));
}
void append(UChar c)
{
if (m_buffer && m_length < m_buffer->length() && m_string.isNull())
m_bufferCharacters[m_length++] = c;
else
append(&c, 1);
}
void append(char c)
{
if (m_buffer && m_length < m_buffer->length() && m_string.isNull())
m_bufferCharacters[m_length++] = (unsigned char)c;
else
append(&c, 1);
}
String toString()
{
if (m_string.isNull()) {
shrinkToFit();
reifyString();
}
return m_string;
}
String toStringPreserveCapacity()
{
if (m_string.isNull())
reifyString();
return m_string;
}
unsigned length() const
{
return m_length;
}
bool isEmpty() const { return !length(); }
void reserveCapacity(unsigned newCapacity);
void resize(unsigned newSize);
void shrinkToFit();
UChar operator[](unsigned i) const
{
ASSERT(i < m_length);
if (!m_string.isNull())
return m_string[i];
ASSERT(m_buffer);
return m_buffer->characters()[i];
}
void clear()
{
m_length = 0;
m_string = String();
m_buffer = 0;
}
private:
void allocateBuffer(const UChar* currentCharacters, unsigned requiredLength);
UChar* appendUninitialized(unsigned length);
void reifyString();
unsigned m_length;
String m_string;
RefPtr<StringImpl> m_buffer;
UChar* m_bufferCharacters;
};
} // namespace WTF
using WTF::StringBuilder;
#endif // StringBuilder_h
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