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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_TRAITS_HXX
#define MPD_FS_TRAITS_HXX
#include "util/Compiler.h"
#include "util/StringPointer.hxx"
#include "util/StringAPI.hxx"
#ifdef _WIN32
#include "util/CharUtil.hxx"
#include <tchar.h>
#endif
#include <cassert>
#include <string>
#ifdef _WIN32
#define PATH_LITERAL(s) _T(s)
#else
#define PATH_LITERAL(s) (s)
#endif
/**
* This class describes the nature of a native filesystem path.
*/
struct PathTraitsFS {
#ifdef _WIN32
using string = std::wstring;
using string_view = std::wstring_view;
#else
using string = std::string;
using string_view = std::string_view;
#endif
using char_traits = string::traits_type;
using value_type = char_traits::char_type;
using Pointer = StringPointer<value_type>;
using pointer = Pointer::pointer;
using const_pointer = Pointer::const_pointer;
#ifdef _WIN32
static constexpr value_type SEPARATOR = '\\';
#else
static constexpr value_type SEPARATOR = '/';
#endif
static constexpr const_pointer CURRENT_DIRECTORY = PATH_LITERAL(".");
static constexpr bool IsSeparator(value_type ch) noexcept {
return
#ifdef _WIN32
ch == '/' ||
#endif
ch == SEPARATOR;
}
gcc_pure gcc_nonnull_all
static const_pointer FindLastSeparator(const_pointer p) noexcept {
#if !CLANG_CHECK_VERSION(3,6)
/* disabled on clang due to -Wtautological-pointer-compare */
assert(p != nullptr);
#endif
#ifdef _WIN32
const_pointer pos = p + GetLength(p);
while (p != pos && !IsSeparator(*pos))
--pos;
return IsSeparator(*pos) ? pos : nullptr;
#else
return StringFindLast(p, SEPARATOR);
#endif
}
[[gnu::pure]]
static const_pointer FindLastSeparator(string_view p) noexcept {
#ifdef _WIN32
const_pointer pos = p.data() + p.size();
while (p.data() != pos && !IsSeparator(*pos))
--pos;
return IsSeparator(*pos) ? pos : nullptr;
#else
return StringFindLast(p.data(), SEPARATOR, p.size());
#endif
}
gcc_pure
static const_pointer GetFilenameSuffix(const_pointer filename) noexcept {
const_pointer dot = StringFindLast(filename, '.');
return dot != nullptr && dot > filename && dot[1] != 0
? dot + 1
: nullptr;
}
gcc_pure
static const_pointer GetPathSuffix(const_pointer path) noexcept {
return GetFilenameSuffix(GetBase(path));
}
#ifdef _WIN32
gcc_pure gcc_nonnull_all
static constexpr bool IsDrive(const_pointer p) noexcept {
return IsAlphaASCII(p[0]) && p[1] == ':';
}
static constexpr bool IsDrive(string_view p) noexcept {
return p.size() >= 2 && IsAlphaASCII(p[0]) && p[1] == ':';
}
#endif
gcc_pure gcc_nonnull_all
static bool IsAbsolute(const_pointer p) noexcept {
#if !CLANG_CHECK_VERSION(3,6)
/* disabled on clang due to -Wtautological-pointer-compare */
assert(p != nullptr);
#endif
#ifdef _WIN32
if (IsDrive(p) && IsSeparator(p[2]))
return true;
#endif
return IsSeparator(*p);
}
gcc_pure gcc_nonnull_all
static bool IsSpecialFilename(const_pointer name) noexcept {
return (name[0] == '.' && name[1] == 0) ||
(name[0] == '.' && name[1] == '.' && name[2] == 0);
}
gcc_pure gcc_nonnull_all
static size_t GetLength(const_pointer p) noexcept {
return StringLength(p);
}
gcc_pure gcc_nonnull_all
static const_pointer Find(const_pointer p, value_type ch) noexcept {
return StringFind(p, ch);
}
/**
* Determine the "base" file name of the given native path.
* The return value points inside the given string.
*/
gcc_pure gcc_nonnull_all
static const_pointer GetBase(const_pointer p) noexcept;
/**
* Determine the "parent" file name of the given native path.
* As a special case, returns the string "." if there is no
* separator in the given input string.
*/
gcc_pure gcc_nonnull_all
static string_view GetParent(const_pointer p) noexcept;
[[gnu::pure]]
static string_view GetParent(string_view p) 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 gcc_nonnull_all
static const_pointer Relative(string_view base, const_pointer other) noexcept;
gcc_pure
static string_view Relative(string_view base, string_view other) noexcept;
/**
* Constructs the path from the given components.
* If either of the components is empty string,
* remaining component is returned unchanged.
* If both components are empty strings, empty string is returned.
*/
gcc_pure
static string Build(string_view a, string_view b) noexcept;
/**
* Interpret the given path as being relative to the given
* base, and return the concatenated path.
*/
gcc_pure
static string Apply(const_pointer base,
const_pointer path) noexcept;
};
/**
* This class describes the nature of a MPD internal filesystem path.
*/
struct PathTraitsUTF8 {
using string = std::string;
using string_view = std::string_view;
using char_traits = string::traits_type;
using value_type = char_traits::char_type;
using pointer = value_type *;
using const_pointer = const value_type *;
static constexpr value_type SEPARATOR = '/';
static constexpr const_pointer CURRENT_DIRECTORY = ".";
static constexpr bool IsSeparator(value_type ch) {
return ch == SEPARATOR;
}
gcc_pure gcc_nonnull_all
static const_pointer FindLastSeparator(const_pointer p) noexcept {
#if !CLANG_CHECK_VERSION(3,6)
/* disabled on clang due to -Wtautological-pointer-compare */
assert(p != nullptr);
#endif
return std::strrchr(p, SEPARATOR);
}
[[gnu::pure]]
static const_pointer FindLastSeparator(string_view p) noexcept {
return StringFindLast(p.data(), SEPARATOR, p.size());
}
gcc_pure
static const_pointer GetFilenameSuffix(const_pointer filename) noexcept {
const_pointer dot = StringFindLast(filename, '.');
return dot != nullptr && dot > filename && dot[1] != 0
? dot + 1
: nullptr;
}
gcc_pure
static const_pointer GetPathSuffix(const_pointer path) noexcept {
return GetFilenameSuffix(GetBase(path));
}
#ifdef _WIN32
gcc_pure gcc_nonnull_all
static constexpr bool IsDrive(const_pointer p) noexcept {
return IsAlphaASCII(p[0]) && p[1] == ':';
}
static constexpr bool IsDrive(string_view p) noexcept {
return p.size() >= 2 && IsAlphaASCII(p[0]) && p[1] == ':';
}
#endif
gcc_pure gcc_nonnull_all
static bool IsAbsolute(const_pointer p) noexcept {
#if !CLANG_CHECK_VERSION(3,6)
/* disabled on clang due to -Wtautological-pointer-compare */
assert(p != nullptr);
#endif
#ifdef _WIN32
if (IsDrive(p) && IsSeparator(p[2]))
return true;
#endif
return IsSeparator(*p);
}
gcc_pure gcc_nonnull_all
static bool IsSpecialFilename(const_pointer name) noexcept {
return (name[0] == '.' && name[1] == 0) ||
(name[0] == '.' && name[1] == '.' && name[2] == 0);
}
gcc_pure gcc_nonnull_all
static size_t GetLength(const_pointer p) noexcept {
return StringLength(p);
}
gcc_pure gcc_nonnull_all
static const_pointer Find(const_pointer p, value_type ch) noexcept {
return StringFind(p, ch);
}
/**
* Determine the "base" file name of the given UTF-8 path.
* The return value points inside the given string.
*/
gcc_pure gcc_nonnull_all
static const_pointer GetBase(const_pointer p) noexcept;
/**
* Determine the "parent" file name of the given UTF-8 path.
* As a special case, returns the string "." if there is no
* separator in the given input string.
*/
gcc_pure gcc_nonnull_all
static string_view GetParent(const_pointer p) noexcept;
[[gnu::pure]]
static string_view GetParent(string_view p) 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 gcc_nonnull_all
static const_pointer Relative(string_view base, const_pointer other) noexcept;
gcc_pure
static string_view Relative(string_view base, string_view other) noexcept;
/**
* Constructs the path from the given components.
* If either of the components is empty string,
* remaining component is returned unchanged.
* If both components are empty strings, empty string is returned.
*/
gcc_pure
static string Build(string_view a, string_view b) noexcept;
};
#endif
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