// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef CHROME_BROWSER_HISTORY_URL_UTILS_H_
#define CHROME_BROWSER_HISTORY_URL_UTILS_H_

#include <string>

class GURL;

namespace history {

// CanonicalURLStringCompare performs lexicographical comparison of two strings
// that represent valid URLs, so that if the pre-path (scheme, host, and port)
// parts are equal, then the path parts are compared by treating path components
// (delimited by "/") as separate tokens that form units of comparison.
// For example, let us compare |s1| and |s2|, with
//   |s1| = "http://www.google.com:80/base/test/ab/cd?query/stuff"
//   |s2| = "http://www.google.com:80/base/test-case/yz#ref/stuff"
// The pre-path parts "http://www.google.com:80/" match. We treat the paths as
//   |s1| => ["base", "test", "ab", "cd"]
//   |s2| => ["base", "test-case", "yz"]
// Components 1 "base" are identical. Components 2 yield "test" < "test-case",
// so we consider |s1| < |s2|, and return true. Note that naive string
// comparison would yield the opposite (|s1| > |s2|), since '/' > '-' in ASCII.
// Note that path can be terminated by "?query" or "#ref". The post-path parts
// are compared in an arbitrary (but consistent) way.
bool CanonicalURLStringCompare(const std::string& s1, const std::string& s2);

// Returns whether |url1| and |url2| have the same scheme, host, and port.
bool HaveSameSchemeHostAndPort(const GURL&url1, const GURL& url2);

// Treats |path1| and |path2| as lists of path components (e.g., ["a", "bb"]
// for "/a/bb"). Returns whether |path1|'s list is a prefix of |path2|'s list.
// This is used to define "URL prefix". Note that "test" does not count as a
// prefix of "testing", even though "test" is a (string) prefix of "testing".
bool IsPathPrefix(const std::string& p1, const std::string& p2);

// Converts |url| from HTTP to HTTPS, and vice versa, then returns the result.
// If |url| is neither HTTP nor HTTPS, returns an empty URL.
GURL ToggleHTTPAndHTTPS(const GURL& url);

}  // namespace history

#endif  // CHROME_BROWSER_HISTORY_URL_UTILS_H_