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#include "indexer/string_slice.hpp"
namespace search
{
JoinIterator::JoinIterator(StringSliceBase const & slice, Position position) : m_slice(slice)
{
if (position == Position::Begin)
{
m_string = 0;
m_offset = 0;
Normalize();
}
else
{
m_string = GetMaxSize();
m_offset = 0;
}
}
// static
JoinIterator JoinIterator::Begin(StringSliceBase const & slice)
{
return JoinIterator(slice, Position::Begin);
}
// static
JoinIterator JoinIterator::End(StringSliceBase const & slice)
{
return JoinIterator(slice, Position::End);
}
JoinIterator & JoinIterator::operator++()
{
++m_offset;
Normalize();
return *this;
}
void JoinIterator::Normalize()
{
while (m_string != GetMaxSize() && m_offset >= GetSize(m_string))
{
++m_string;
m_offset = 0;
}
}
size_t JoinIterator::GetSize(size_t string) const
{
if (string >= GetMaxSize())
return 0;
if (string & 1)
return 1;
return m_slice.Get(string >> 1).size();
}
JoinIterator::value_type JoinIterator::GetChar(size_t string, size_t offset) const
{
if (string >= GetMaxSize())
return 0;
if (string & 1)
{
ASSERT_EQUAL(offset, 0, ());
return ' ';
}
auto const & s = m_slice.Get(string >> 1);
ASSERT_LESS(offset, s.size(), ());
return s[offset];
}
} // namespace search
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