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/*
*/
#include "path.h"
helpers::path::path(const char* s):
m_str(s)
{
// 1. Normalise path separators to the system specified separator
for(size_t i = 0; i < m_str.size(); i ++)
{
if( m_str[i] == '/' || m_str[i] == '\\' )
m_str[i] = SEP;
}
// 2. Remove any trailing separators
if( !m_str.empty() )
{
while(!m_str.empty() && m_str.back() == SEP )
m_str.pop_back();
if(m_str.empty())
{
m_str.push_back(SEP);
}
}
else
{
throw ::std::runtime_error("Empty path being constructed");
}
}
helpers::path helpers::path::normalise() const
{
path rv;
rv.m_str.reserve( m_str.size()+1 );
for(auto comp : *this)
{
if( comp == "." ) {
// Ignore.
}
else if( comp == ".." )
{
// If the path is empty, OR the last element is a "..", push the element
if( rv.m_str.empty()
|| (rv.m_str.size() == 3 && rv.m_str[0] == '.' && rv.m_str[1] == '.' && rv.m_str[2] == SEP)
|| (rv.m_str.size() > 4 && *(rv.m_str.end()-4) == SEP && *(rv.m_str.end()-3) == '.' && *(rv.m_str.end()-2) == '.' && *(rv.m_str.end()-1) == SEP )
)
{
// Push
rv.m_str += comp;
rv.m_str += SEP;
}
else
{
rv.m_str.pop_back();
auto pos = rv.m_str.find_last_of(SEP);
if(pos == ::std::string::npos)
{
rv.m_str.resize(0);
}
else if( pos == 0 )
{
// Keep.
}
else
{
rv.m_str.resize(pos+1);
}
}
}
else
{
rv.m_str += comp;
rv.m_str += SEP;
}
}
rv.m_str.pop_back();
return rv;
}
#if 0
void helpers::path::normalise_in_place()
{
size_t insert_point = 0;
for(size_t read_pos = 0; read_pos < m_str.size(); read_pos ++)
{
auto pos = m_str.find_first_of(SEP, read_pos);
if(pos == ::std::string::npos)
pos = m_str.size();
auto comp = string_view(m_str.c_str() + read_pos, pos - read_pos);
bool append;
if(comp == ".")
{
// Advance read without touching insert
append = false;
}
else if( comp == ".." )
{
// Consume parent (if not a relative component already)
// Move insertion point back to the previous separator
auto pos = m_str.find_last_of(SEP, insert_point);
if(pos == ::std::string::npos)
{
// Only one component currently (or empty)
append = true;
}
else if(string_view(m_str.c_str() + pos+1, insert_point - pos-1) == "..")
{
// Last component is ".." - keep adding
append = true;
}
else
{
insert_point = pos;
append = false;
}
}
else
{
append = true;
}
if(append)
{
if( read_pos != insert_point )
{
//assert(read_pos > insert_point);
while(read_pos < pos)
{
m_str[insert_point++] = m_str[read_pos++];
}
}
}
else
{
read_pos = pos;
}
}
}
#endif
void helpers::path::ComponentsIter::operator++()
{
if(end == p.m_str.size())
{
pos = end;
}
else
{
pos = end+1;
end = p.m_str.find(SEP, pos);
if(end == ::std::string::npos)
end = p.m_str.size();
}
}
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