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/*
* Copyright 2003-2021 The Music Player Daemon Project
* http://www.musicpd.org
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "Traits.hxx"
#include "util/StringCompare.hxx"
#include <string.h>
template<typename Traits>
typename Traits::string
BuildPathImpl(typename Traits::string_view a,
typename Traits::string_view b) noexcept
{
if (a.empty())
return typename Traits::string(b);
if (b.empty())
return typename Traits::string(a);
typename Traits::string result;
result.reserve(a.length() + 1 + b.length());
result.append(a);
if (!Traits::IsSeparator(a.back()))
result.push_back(Traits::SEPARATOR);
if (Traits::IsSeparator(b.front()))
result.append(b.substr(1));
else
result.append(b);
return result;
}
template<typename Traits>
typename Traits::const_pointer
GetBasePathImpl(typename Traits::const_pointer p) noexcept
{
#if !CLANG_CHECK_VERSION(3,6)
/* disabled on clang due to -Wtautological-pointer-compare */
assert(p != nullptr);
#endif
auto sep = Traits::FindLastSeparator(p);
return sep != nullptr
? sep + 1
: p;
}
template<typename Traits>
typename Traits::string_view
GetParentPathImpl(typename Traits::const_pointer p) noexcept
{
#if !CLANG_CHECK_VERSION(3,6)
/* disabled on clang due to -Wtautological-pointer-compare */
assert(p != nullptr);
#endif
auto sep = Traits::FindLastSeparator(p);
if (sep == nullptr)
return Traits::CURRENT_DIRECTORY;
if (sep == p)
return {p, 1u};
#ifdef _WIN32
if (Traits::IsDrive(p) && sep == p + 2)
return {p, 3u};
#endif
return {p, size_t(sep - p)};
}
template<typename Traits>
typename Traits::const_pointer
RelativePathImpl(typename Traits::string_view base,
typename Traits::const_pointer other) noexcept
{
assert(other != nullptr);
other = StringAfterPrefix(other, base);
if (other == nullptr)
/* mismatch */
return nullptr;
if (*other != 0) {
if (!Traits::IsSeparator(*other)) {
if (!base.empty() && Traits::IsSeparator(other[-1]))
/* "other" has no more slash, but the
matching base ended with a slash:
enough to detect a match */
return other;
/* mismatch */
return nullptr;
}
/* skip remaining path separators */
do {
++other;
} while (Traits::IsSeparator(*other));
}
return other;
}
template<typename Traits>
typename Traits::string_view
RelativePathImpl(typename Traits::string_view base,
typename Traits::string_view _other) noexcept
{
BasicStringView<typename Traits::value_type> other(_other);
if (!other.SkipPrefix(base))
/* mismatch */
return {};
if (!other.empty()) {
if (!Traits::IsSeparator(other.front())) {
if (!base.empty() && Traits::IsSeparator(other.data[-1]))
/* "other" has no more slash, but the
matching base ended with a slash:
enough to detect a match */
return other;
/* mismatch */
return {};
}
/* skip remaining path separators */
while (!other.empty() && Traits::IsSeparator(other.front()))
other.pop_front();
}
return other;
}
PathTraitsFS::string
PathTraitsFS::Build(string_view a, string_view b) noexcept
{
return BuildPathImpl<PathTraitsFS>(a, b);
}
PathTraitsFS::const_pointer
PathTraitsFS::GetBase(PathTraitsFS::const_pointer p) noexcept
{
return GetBasePathImpl<PathTraitsFS>(p);
}
PathTraitsFS::string_view
PathTraitsFS::GetParent(PathTraitsFS::const_pointer p) noexcept
{
return GetParentPathImpl<PathTraitsFS>(p);
}
PathTraitsFS::const_pointer
PathTraitsFS::Relative(string_view base, const_pointer other) noexcept
{
return RelativePathImpl<PathTraitsFS>(base, other);
}
PathTraitsFS::string_view
PathTraitsFS::Relative(string_view base, string_view other) noexcept
{
return RelativePathImpl<PathTraitsFS>(base, other);
}
PathTraitsFS::string
PathTraitsFS::Apply(const_pointer base, const_pointer path) noexcept
{
// TODO: support the Windows syntax (absolute path with or without drive, drive with relative path)
if (base == nullptr)
return path;
if (IsAbsolute(path))
return path;
return Build(base, path);
}
PathTraitsUTF8::string
PathTraitsUTF8::Build(string_view a, string_view b) noexcept
{
return BuildPathImpl<PathTraitsUTF8>(a, b);
}
PathTraitsUTF8::const_pointer
PathTraitsUTF8::GetBase(const_pointer p) noexcept
{
return GetBasePathImpl<PathTraitsUTF8>(p);
}
PathTraitsUTF8::string_view
PathTraitsUTF8::GetParent(const_pointer p) noexcept
{
return GetParentPathImpl<PathTraitsUTF8>(p);
}
PathTraitsUTF8::const_pointer
PathTraitsUTF8::Relative(string_view base, const_pointer other) noexcept
{
return RelativePathImpl<PathTraitsUTF8>(base, other);
}
PathTraitsUTF8::string_view
PathTraitsUTF8::Relative(string_view base, string_view other) noexcept
{
return RelativePathImpl<PathTraitsUTF8>(base, other);
}
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