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a3e4dfdf98
We shouldn't just drop leading ..-s for relative paths. At the same time,
we should handle paths like
../foo/../../bar
correctly: the first .. after the foo cancels out the foo, but the second
one should get treated as a leading one and not get dropped.
Note that since this path resolution is purely lexical, it's never going to be
completely correct with respect to symlinks and other filesystem magic. Better
don't use it when dealing with files.
120 lines
4 KiB
C++
120 lines
4 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <AK/FileSystemPath.h>
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#include <AK/StringBuilder.h>
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#include <AK/StringView.h>
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#include <AK/Vector.h>
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namespace AK {
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FileSystemPath::FileSystemPath(const StringView& s)
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: m_string(s)
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{
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canonicalize();
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m_is_valid = true;
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}
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void FileSystemPath::canonicalize()
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{
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if (m_string.is_empty()) {
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m_parts.clear();
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return;
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}
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m_is_absolute = m_string[0] == '/';
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auto parts = m_string.split_view('/');
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size_t approximate_canonical_length = 0;
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Vector<String> canonical_parts;
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for (size_t i = 0; i < parts.size(); ++i) {
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auto& part = parts[i];
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if (part == ".")
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continue;
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if (part == "..") {
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if (canonical_parts.is_empty()) {
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if (m_is_absolute) {
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// At the root, .. does nothing.
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continue;
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}
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} else {
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if (canonical_parts.last() != "..") {
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// A .. and a previous non-.. part cancel each other.
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canonical_parts.take_last();
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continue;
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}
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}
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}
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if (!part.is_empty()) {
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approximate_canonical_length += part.length() + 1;
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canonical_parts.append(part);
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}
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}
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if (canonical_parts.is_empty()) {
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m_string = m_basename = m_dirname = "/";
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return;
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}
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StringBuilder dirname_builder(approximate_canonical_length);
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for (size_t i = 0; i < canonical_parts.size() - 1; ++i) {
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auto& canonical_part = canonical_parts[i];
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if (m_is_absolute || i != 0)
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dirname_builder.append('/');
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dirname_builder.append(canonical_part);
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}
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m_dirname = dirname_builder.to_string();
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m_basename = canonical_parts.last();
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auto name_parts = m_basename.split('.');
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m_title = name_parts.is_empty() ? String() : name_parts[0];
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if (name_parts.size() > 1)
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m_extension = name_parts.last();
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StringBuilder builder(approximate_canonical_length);
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for (size_t i = 0; i < canonical_parts.size(); ++i) {
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auto& canonical_part = canonical_parts[i];
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if (m_is_absolute || i != 0)
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builder.append('/');
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builder.append(canonical_part);
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}
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m_parts = move(canonical_parts);
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m_string = builder.to_string();
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}
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bool FileSystemPath::has_extension(StringView extension) const
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{
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// FIXME: This is inefficient, expand StringView with enough functionality that we don't need to copy strings here.
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String extension_string = extension;
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return m_string.to_lowercase().ends_with(extension_string.to_lowercase());
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}
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String canonicalized_path(const StringView& path)
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{
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return FileSystemPath(path).string();
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}
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}
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