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tdutils/td/utils/PathView.h

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+/*
+    This file is part of TON Blockchain Library.
+
+    TON Blockchain Library is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Lesser General Public License as published by
+    the Free Software Foundation, either version 2 of the License, or
+    (at your option) any later version.
+
+    TON Blockchain Library 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 Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public License
+    along with TON Blockchain Library.  If not, see <http://www.gnu.org/licenses/>.
+
+    Copyright 2017-2019 Telegram Systems LLP
+*/
+#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