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Each of these strings would previously rely on StringView's char const* constructor overload, which would call __builtin_strlen on the string. Since we now have operator ""sv, we can replace these with much simpler versions. This opens the door to being able to remove StringView(char const*). No functional changes.
178 lines
5.0 KiB
C++
178 lines
5.0 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* Copyright (c) 2021, Max Wipfli <max.wipfli@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/LexicalPath.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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char s_single_dot = '.';
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LexicalPath::LexicalPath(String path)
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: m_string(canonicalized_path(move(path)))
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{
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if (m_string.is_empty()) {
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m_string = ".";
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m_dirname = m_string;
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m_basename = {};
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m_title = {};
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m_extension = {};
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m_parts.clear();
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return;
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}
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m_parts = m_string.split_view('/');
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auto last_slash_index = m_string.view().find_last('/');
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if (!last_slash_index.has_value()) {
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// The path contains a single part and is not absolute. m_dirname = "."sv
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m_dirname = { &s_single_dot, 1 };
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} else if (*last_slash_index == 0) {
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// The path contains a single part and is absolute. m_dirname = "/"sv
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m_dirname = m_string.substring_view(0, 1);
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} else {
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m_dirname = m_string.substring_view(0, *last_slash_index);
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}
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if (m_string == "/")
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m_basename = m_string;
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else {
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VERIFY(m_parts.size() > 0);
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m_basename = m_parts.last();
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}
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auto last_dot_index = m_basename.find_last('.');
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// NOTE: if the dot index is 0, this means we have ".foo", it's not an extension, as the title would then be "".
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if (last_dot_index.has_value() && *last_dot_index != 0) {
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m_title = m_basename.substring_view(0, *last_dot_index);
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m_extension = m_basename.substring_view(*last_dot_index + 1);
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} else {
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m_title = m_basename;
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m_extension = {};
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}
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}
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Vector<String> LexicalPath::parts() const
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{
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Vector<String> vector;
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vector.ensure_capacity(m_parts.size());
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for (auto& part : m_parts)
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vector.unchecked_append(part);
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return vector;
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}
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bool LexicalPath::has_extension(StringView extension) const
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{
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return m_string.ends_with(extension, CaseSensitivity::CaseInsensitive);
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}
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String LexicalPath::canonicalized_path(String path)
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{
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if (path.is_null())
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return {};
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// NOTE: We never allow an empty m_string, if it's empty, we just set it to '.'.
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if (path.is_empty())
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return ".";
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// NOTE: If there are no dots, no '//' and the path doesn't end with a slash, it is already canonical.
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if (!path.contains("."sv) && !path.contains("//"sv) && !path.ends_with('/'))
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return path;
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auto is_absolute = path[0] == '/';
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auto parts = path.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 (auto& part : parts) {
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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 (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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approximate_canonical_length += part.length() + 1;
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canonical_parts.append(part);
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}
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if (canonical_parts.is_empty() && !is_absolute)
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canonical_parts.append(".");
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StringBuilder builder(approximate_canonical_length);
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if (is_absolute)
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builder.append('/');
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builder.join('/', canonical_parts);
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return builder.to_string();
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}
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String LexicalPath::absolute_path(String dir_path, String target)
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{
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if (LexicalPath(target).is_absolute()) {
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return LexicalPath::canonicalized_path(target);
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}
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return LexicalPath::canonicalized_path(join(dir_path, target).string());
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}
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String LexicalPath::relative_path(StringView a_path, StringView a_prefix)
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{
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if (!a_path.starts_with('/') || !a_prefix.starts_with('/')) {
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// FIXME: This should probably VERIFY or return an Optional<String>.
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return ""sv;
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}
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if (a_path == a_prefix)
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return ".";
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// NOTE: Strip optional trailing slashes, except if the full path is only "/".
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auto path = canonicalized_path(a_path);
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auto prefix = canonicalized_path(a_prefix);
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if (path == prefix)
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return ".";
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// NOTE: Handle this special case first.
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if (prefix == "/"sv)
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return path.substring_view(1);
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// NOTE: This means the prefix is a direct child of the path.
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if (path.starts_with(prefix) && path[prefix.length()] == '/') {
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return path.substring_view(prefix.length() + 1);
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}
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// FIXME: It's still possible to generate a relative path in this case, it just needs some "..".
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return path;
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}
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LexicalPath LexicalPath::append(StringView value) const
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{
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return LexicalPath::join(m_string, value);
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}
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LexicalPath LexicalPath::prepend(StringView value) const
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{
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return LexicalPath::join(value, m_string);
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}
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LexicalPath LexicalPath::parent() const
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{
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return append(".."sv);
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}
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}
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