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tdlib-fork/tdutils/td/utils/PathView.h
levlam b4d6662f71 Add some debug.
GitOrigin-RevId: 29b2efa626ed4a6a0c0eb2ac2cec2fb245e9e6b5
2018-06-25 01:51:15 +03:00

117 lines
2.5 KiB
C++

//
// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2018
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
#pragma once
#include "td/utils/misc.h"
#include "td/utils/Slice.h"
namespace td {
class PathView {
public:
explicit PathView(Slice path) : path_(path) {
last_slash_ = narrow_cast<int32>(path_.size()) - 1;
while (last_slash_ >= 0 && !is_slash(path_[last_slash_])) {
last_slash_--;
}
last_dot_ = static_cast<int32>(path_.size());
for (auto i = last_dot_ - 1; i > last_slash_ + 1; i--) {
if (path_[i] == '.') {
last_dot_ = i;
break;
}
}
}
bool empty() const {
return path_.empty();
}
bool is_dir() const {
if (empty()) {
return false;
}
return is_slash(path_.back());
}
Slice parent_dir() const {
return path_.substr(0, last_slash_ + 1);
}
Slice extension() const {
if (last_dot_ == static_cast<int32>(path_.size())) {
return Slice();
}
return path_.substr(last_dot_ + 1);
}
Slice without_extension() const {
return path_.substr(0, last_dot_);
}
Slice file_stem() const {
return path_.substr(last_slash_ + 1, last_dot_ - last_slash_ - 1);
}
Slice file_name() const {
return path_.substr(last_slash_ + 1);
}
Slice path() const {
return path_;
}
bool is_absolute() const {
return !empty() && (is_slash(path_[0]) || (path_.size() >= 3 && path_[1] == ':' && is_slash(path_[2])));
}
bool is_relative() const {
return !is_absolute();
}
static Slice relative(Slice path, Slice dir, bool force = false) {
if (begins_with(path, dir)) {
path.remove_prefix(dir.size());
return path;
}
if (force) {
return Slice();
}
return path;
}
static Slice dir_and_file(Slice path) {
auto last_slash = static_cast<int32>(path.size()) - 1;
while (last_slash >= 0 && !is_slash(path[last_slash])) {
last_slash--;
}
if (last_slash < 0) {
return Slice();
}
last_slash--;
while (last_slash >= 0 && !is_slash(path[last_slash])) {
last_slash--;
}
if (last_slash < 0) {
return Slice();
}
return path.substr(last_slash + 1);
}
private:
static bool is_slash(char c) {
return c == '/' || c == '\\';
}
Slice path_;
int32 last_slash_;
int32 last_dot_;
};
} // namespace td