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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.
*/
#ifndef MPD_FS_PATH_HXX
#define MPD_FS_PATH_HXX
#include "util/Compiler.h"
#include "Traits.hxx"
#include <cassert>
#include <string>
class AllocatedPath;
/**
* A path name in the native file system character set.
*
* This class manages a pointer to an existing path string. While an
* instance lives, the string must not be invalidated.
*/
class Path : public PathTraitsFS::Pointer {
using Traits = PathTraitsFS;
using Base = Traits::Pointer;
explicit constexpr Path(const_pointer _value) noexcept:Base(_value) {}
public:
/**
* Construct a "nulled" instance. Its IsNull() method will
* return true. Such an object must not be used.
*
* @see IsNull()
*/
constexpr Path(std::nullptr_t) noexcept:Base(nullptr) {}
/**
* Copy a #Path object.
*/
constexpr Path(const Path &) = default;
/**
* Create a new instance pointing to the specified path
* string.
*/
static constexpr Path FromFS(const_pointer fs) noexcept {
return Path(fs);
}
/**
* Copy a #Path object.
*/
Path &operator=(const Path &) = default;
/**
* Check if this is a "nulled" instance. A "nulled" instance
* must not be used.
*/
constexpr bool IsNull() const noexcept {
return Base::IsNull();
}
/**
* Clear this object's value, make it "nulled".
*
* @see IsNull()
*/
void SetNull() noexcept {
*this = nullptr;
}
/**
* @return the length of this string in number of "value_type"
* elements (which may not be the number of characters).
*/
gcc_pure
size_t length() const noexcept {
assert(!IsNull());
return Traits::GetLength(c_str());
}
/**
* Returns the value as a const C string. The returned
* pointer is invalidated whenever the value of life of this
* instance ends.
*/
constexpr const_pointer c_str() const noexcept {
return Base::c_str();
}
/**
* Returns a pointer to the raw value, not necessarily
* null-terminated.
*/
constexpr const_pointer data() const noexcept {
return c_str();
}
/**
* Does the path contain a newline character? (Which is
* usually rejected by MPD because its protocol cannot
* transfer newline characters).
*/
gcc_pure
bool HasNewline() const noexcept {
return Traits::Find(c_str(), '\n') != nullptr;
}
/**
* Convert the path to UTF-8.
* Returns empty string on error or if this instance is "nulled"
* (#IsNull returns true).
*/
gcc_pure
std::string ToUTF8() const noexcept;
/**
* Like ToUTF8(), but throws on error.
*/
std::string ToUTF8Throw() const;
/**
* Determine the "base" file name.
* The return value points inside this object.
*/
gcc_pure
Path GetBase() const noexcept {
return FromFS(Traits::GetBase(c_str()));
}
/**
* Gets directory name of this path.
* Returns a "nulled" instance on error.
*/
gcc_pure
AllocatedPath GetDirectoryName() const noexcept;
/**
* Determine the relative part of the given path to this
* object, not including the directory separator. Returns an
* empty string if the given path equals this object or
* nullptr on mismatch.
*/
gcc_pure
const_pointer Relative(Path other_fs) const noexcept {
return Traits::Relative(c_str(), other_fs.c_str());
}
gcc_pure
bool IsAbsolute() const noexcept {
return Traits::IsAbsolute(c_str());
}
gcc_pure
const_pointer GetSuffix() const noexcept;
};
/**
* Concatenate two path components using the directory separator.
*
* Wrapper for AllocatedPath::Build().
*/
AllocatedPath
operator/(Path a, Path b) noexcept;
#endif
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