void path::m_path_iterator_decrement(path::iterator & it)
{
BOOST_ASSERT(it.m_pos && "path::iterator decrement past begin()");
size_type end_pos(it.m_pos);
// if at end and there was a trailing non-root '/', return "."
if (it.m_pos == it.m_path_ptr->m_pathname.size()
&& it.m_path_ptr->m_pathname.size() > 1
&& is_separator(it.m_path_ptr->m_pathname[it.m_pos-1])
&& is_non_root_separator(it.m_path_ptr->m_pathname, it.m_pos-1)
)
{
--it.m_pos;
it.m_element = dot_path;
return;
}
size_type root_dir_pos(root_directory_start(it.m_path_ptr->m_pathname, end_pos));
// skip separators unless root directory
for (
;
end_pos > 0
&& (end_pos-1) != root_dir_pos
&& is_separator(it.m_path_ptr->m_pathname[end_pos-1])
;
--end_pos) {}
it.m_pos = filename_pos(it.m_path_ptr->m_pathname, end_pos);
it.m_element = it.m_path_ptr->m_pathname.substr(it.m_pos, end_pos - it.m_pos);
if (it.m_element.m_pathname == preferred_separator_string)
it.m_element.m_pathname = separator_string; // needed for Windows, harmless on POSIX
}
void path::m_path_iterator_increment(path::iterator & it)
{
BOOST_ASSERT(it.m_pos < it.m_path_ptr->m_pathname.size() && "path::basic_iterator increment past end()");
// increment to position past current element
it.m_pos += it.m_element.m_pathname.size();
// if end reached, create end basic_iterator
if (it.m_pos == it.m_path_ptr->m_pathname.size())
{
it.m_element.clear();
return;
}
// both POSIX and Windows treat paths that begin with exactly two separators specially
bool was_net(it.m_element.m_pathname.size() > 2
&& is_separator(it.m_element.m_pathname[0])
&& is_separator(it.m_element.m_pathname[1])
&& !is_separator(it.m_element.m_pathname[2]));
// process separator (Windows drive spec is only case not a separator)
if (is_separator(it.m_path_ptr->m_pathname[it.m_pos]))
{
// detect root directory
if (was_net
# ifdef BOOST_WINDOWS_API
// case "c:/"
|| it.m_element.m_pathname[it.m_element.m_pathname.size()-1] == colon
# endif
)
{
it.m_element.m_pathname = separator;
return;
}
// bypass separators
while (it.m_pos != it.m_path_ptr->m_pathname.size()
&& is_separator(it.m_path_ptr->m_pathname[it.m_pos]))
{
++it.m_pos;
}
// detect trailing separator, and treat it as ".", per POSIX spec
if (it.m_pos == it.m_path_ptr->m_pathname.size()
&& is_non_root_separator(it.m_path_ptr->m_pathname, it.m_pos-1))
{
--it.m_pos;
it.m_element = dot_path;
return;
}
}
// get next element
size_type end_pos(it.m_path_ptr->m_pathname.find_first_of(separators, it.m_pos));
if (end_pos == string_type::npos) end_pos = it.m_path_ptr->m_pathname.size();
it.m_element = it.m_path_ptr->m_pathname.substr(it.m_pos, end_pos - it.m_pos);
}
path path::filename() const
{
size_type pos(filename_pos(m_pathname, m_pathname.size()));
return (m_pathname.size()
&& pos
&& is_separator(m_pathname[pos])
&& is_non_root_separator(m_pathname, pos))
? dot_path
: path(m_pathname.c_str() + pos);
}
