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StringBuilder: Use a ByteBuffer internally instead of a Vector<String>.

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This commit is contained in:
Andreas Kling 2019-01-18 03:27:51 +01:00
parent 074edffc44
commit 9d7da26b4e
6 changed files with 58 additions and 37 deletions
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42
AK/StringBuilder.cpp
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@ -1,22 +1,30 @@
#include "StringBuilder.h"
#include <LibC/stdarg.h>
#include "printf.cpp"
#include <AK/StdLibExtras.h>
namespace AK {
void StringBuilder::append(String&& str)
inline void StringBuilder::will_append(size_t size)
{
m_strings.append(move(str));
if ((m_length + size) > m_buffer.size())
m_buffer.grow(max(16u, m_buffer.size() * 2 + size));
}
void StringBuilder::append(const String& str)
{
m_strings.append(str);
if (str.is_empty())
return;
will_append(str.length());
memcpy(m_buffer.pointer() + m_length, str.characters(), str.length());
m_length += str.length();
}
void StringBuilder::append(char ch)
{
m_strings.append(StringImpl::create(&ch, 1));
will_append(1);
m_buffer.pointer()[m_length] = ch;
m_length += 1;
}
void StringBuilder::appendf(const char* fmt, ...)
@ -29,27 +37,15 @@ void StringBuilder::appendf(const char* fmt, ...)
va_end(ap);
}
ByteBuffer StringBuilder::to_byte_buffer()
{
m_buffer.trim(m_length);
return m_buffer;
}
String StringBuilder::build()
{
auto strings = move(m_strings);
if (strings.is_empty())
return String::empty();
size_t sizeNeeded = 0;
for (auto& string : strings)
sizeNeeded += string.length();
char* buffer;
auto impl = StringImpl::create_uninitialized(sizeNeeded, buffer);
if (!impl)
return String();
for (auto& string : strings) {
memcpy(buffer, string.characters(), string.length());
buffer += string.length();
}
*buffer = '\0';
return String(move(impl));
return String((const char*)m_buffer.pointer(), m_length);
}
}