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// Copyright (c) 2008 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/file_path.h"
// These includes are just for the *Hack functions, and should be removed
// when those functions are removed.
#include "base/string_piece.h"
#include "base/sys_string_conversions.h"
#if defined(FILE_PATH_USES_WIN_SEPARATORS)
const FilePath::CharType FilePath::kSeparators[] = FILE_PATH_LITERAL("\\/");
#else // FILE_PATH_USES_WIN_SEPARATORS
const FilePath::CharType FilePath::kSeparators[] = FILE_PATH_LITERAL("/");
#endif // FILE_PATH_USES_WIN_SEPARATORS
const FilePath::CharType FilePath::kCurrentDirectory[] = FILE_PATH_LITERAL(".");
const FilePath::CharType FilePath::kParentDirectory[] = FILE_PATH_LITERAL("..");
bool FilePath::IsSeparator(CharType character) {
for (size_t i = 0; i < arraysize(kSeparators) - 1; ++i) {
if (character == kSeparators[i]) {
return true;
}
}
return false;
}
// libgen's dirname and basename aren't guaranteed to be thread-safe and aren't
// guaranteed to not modify their input strings, and in fact are implmeneted
// differently in this regard on different platforms. Don't use them, but
// adhere to their behavior.
FilePath FilePath::DirName() const {
FilePath new_path(path_);
new_path.StripTrailingSeparators();
// The drive letter, if any, always needs to remain in the output. If there
// is no drive letter, as will always be the case on platforms which do not
// support drive letters, letter will be npos, or -1, so the comparisons and
// resizes below using letter will still be valid.
StringType::size_type letter = new_path.FindDriveLetter();
StringType::size_type last_separator =
new_path.path_.find_last_of(kSeparators, StringType::npos,
arraysize(kSeparators) - 1);
if (last_separator == StringType::npos) {
// path_ is in the current directory.
new_path.path_.resize(letter + 1);
} else if (last_separator == letter + 1) {
// path_ is in the root directory.
new_path.path_.resize(letter + 2);
} else if (last_separator == letter + 2 &&
IsSeparator(new_path.path_[letter + 1])) {
// path_ is in "//" (possibly with a drive letter); leave the double
// separator intact indicating alternate root.
new_path.path_.resize(letter + 3);
} else if (last_separator != 0) {
// path_ is somewhere else, trim the basename.
new_path.path_.resize(last_separator);
}
new_path.StripTrailingSeparators();
if (!new_path.path_.length())
new_path.path_ = kCurrentDirectory;
return new_path;
}
FilePath FilePath::BaseName() const {
FilePath new_path(path_);
new_path.StripTrailingSeparators();
// The drive letter, if any, is always stripped.
StringType::size_type letter = new_path.FindDriveLetter();
if (letter != StringType::npos) {
new_path.path_.erase(0, letter + 1);
}
// Keep everything after the final separator, but if the pathname is only
// one character and it's a separator, leave it alone.
StringType::size_type last_separator =
new_path.path_.find_last_of(kSeparators, StringType::npos,
arraysize(kSeparators) - 1);
if (last_separator != StringType::npos &&
last_separator < new_path.path_.length() - 1) {
new_path.path_.erase(0, last_separator + 1);
}
return new_path;
}
FilePath FilePath::Append(const FilePath::StringType& component) const {
if (path_.compare(kCurrentDirectory) == 0) {
// Append normally doesn't do any normalization, but as a special case,
// when appending to kCurrentDirectory, just return a new path for the
// component argument. Appending component to kCurrentDirectory would
// serve no purpose other than needlessly lengthening the path, and
// it's likely in practice to wind up with FilePath objects containing
// only kCurrentDirectory when calling DirName on a single relative path
// component.
return FilePath(component);
}
FilePath new_path(path_);
new_path.StripTrailingSeparators();
// Don't append a separator if the path is empty (indicating the current
// directory) or if the path component is empty (indicating nothing to
// append).
if (component.length() > 0 && new_path.path_.length() > 0) {
// Don't append a separator if the path still ends with a trailing
// separator after stripping (indicating the root directory).
if (!IsSeparator(new_path.path_[new_path.path_.length() - 1])) {
// Don't append a separator if the path is just a drive letter.
if (new_path.FindDriveLetter() + 1 != new_path.path_.length()) {
new_path.path_.append(1, kSeparators[0]);
}
}
}
new_path.path_.append(component);
return new_path;
}
FilePath::StringType::size_type FilePath::FindDriveLetter() const {
#if defined(FILE_PATH_USES_DRIVE_LETTERS)
// This is dependent on an ASCII-based character set, but that's a
// reasonable assumption. iswalpha can be too inclusive here.
if (path_.length() >= 2 && path_[1] == L':' &&
((path_[0] >= L'A' && path_[0] <= L'Z') ||
(path_[0] >= L'a' && path_[0] <= L'z'))) {
return 1;
}
return StringType::npos;
#else // FILE_PATH_USES_DRIVE_LETTERS
return StringType::npos;
#endif // FILE_PATH_USES_DRIVE_LETTERS
}
bool FilePath::IsAbsolute() const {
#if defined(FILE_PATH_USES_DRIVE_LETTERS)
StringType::size_type letter = FindDriveLetter();
if (letter != StringType::npos) {
// Look for a separator right after the drive specification.
return path_.length() > letter + 1 && IsSeparator(path_[letter + 1]);
}
// Look for a pair of leading separators.
return path_.length() > 1 && IsSeparator(path_[0]) && IsSeparator(path_[1]);
#else // FILE_PATH_USES_DRIVE_LETTERS
// Look for a separator in the first position.
return path_.length() > 0 && IsSeparator(path_[0]);
#endif // FILE_PATH_USES_DRIVE_LETTERS
}
#if defined(OS_POSIX)
// See file_path.h for a discussion of the encoding of paths on POSIX
// platforms. These *Hack() functions are not quite correct, but they're
// only temporary while we fix the remainder of the code.
// Remember to remove the #includes at the top when you remove these.
// static
FilePath FilePath::FromWStringHack(const std::wstring& wstring) {
return FilePath(base::SysWideToNativeMB(wstring));
}
std::wstring FilePath::ToWStringHack() const {
return base::SysNativeMBToWide(path_);
}
#elif defined(OS_WIN)
// static
FilePath FilePath::FromWStringHack(const std::wstring& wstring) {
return FilePath(wstring);
}
std::wstring FilePath::ToWStringHack() const {
return path_;
}
#endif
void FilePath::StripTrailingSeparators() {
// If there is no drive letter, start will be 1, which will prevent stripping
// the leading separator if there is only one separator. If there is a drive
// letter, start will be set appropriately to prevent stripping the first
// separator following the drive letter, if a separator immediately follows
// the drive letter.
StringType::size_type start = FindDriveLetter() + 2;
StringType::size_type last_stripped = StringType::npos;
for (StringType::size_type pos = path_.length();
pos > start && IsSeparator(path_[pos - 1]);
--pos) {
// If the string only has two separators and they're at the beginning,
// don't strip them, unless the string began with more than two separators.
if (pos != start + 1 || last_stripped == start + 2 ||
!IsSeparator(path_[start - 1])) {
path_.resize(pos - 1);
last_stripped = pos;
}
}
}
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