/*
 * Copyright (C) 2010 Google Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
 *     * Neither the name of Google Inc. nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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 */

#ifndef DOMFilePath_h
#define DOMFilePath_h

#include "platform/wtf/Allocator.h"
#include "platform/wtf/text/WTFString.h"

namespace blink {

// DOMFileSystem path utilities. All methods in this class are static.
class DOMFilePath {
  STATIC_ONLY(DOMFilePath);

 public:
  static const char kSeparator;
  static const char kRoot[];

  // Returns the name part from the given path.
  static String GetName(const String& path);

  // Returns the parent directory path of the given path.
  static String GetDirectory(const String& path);

  // Checks if a given path is a parent of mayBeChild. This method assumes given
  // paths are absolute and do not have extra references to a parent (i.e.
  // "../").
  static bool IsParentOf(const String& path, const String& may_be_child);

  // Appends the separator at the end of the path if it's not there already.
  static String EnsureDirectoryPath(const String& path);

  // Returns a new path by appending a separator and the supplied path component
  // to the path.
  static String Append(const String& path, const String& component);

  static bool IsAbsolute(const String& path) {
    return path.StartsWith(DOMFilePath::kRoot);
  }

  static bool EndsWithSeparator(const String& path) {
    return path[path.length() - 1] == DOMFilePath::kSeparator;
  }

  // Evaluates all "../" and "./" segments. Note that "/../" expands to "/", so
  // you can't ever refer to anything above the root directory.
  static String RemoveExtraParentReferences(const String& path);

  // Checks if the given path follows the FileSystem API naming restrictions.
  static bool IsValidPath(const String& path);

  // Checks if the given name follows the FileSystem API naming restrictions.
  static bool IsValidName(const String& name);
};

}  // namespace blink

#endif  // DOMFilePath_h