desktop/source/deployment/misc/dp_version.cxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
   4  *
   5  * This Source Code Form is subject to the terms of the Mozilla Public
   6  * License, v. 2.0. If a copy of the MPL was not distributed with this
   7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   8  *
   9  * This file incorporates work covered by the following license notice:
  10  *
  11  *   Licensed to the Apache Software Foundation (ASF) under one or more
  12  *   contributor license agreements. See the NOTICE file distributed
  13  *   with this work for additional information regarding copyright
  14  *   ownership. The ASF licenses this file to you under the Apache
  15  *   License, Version 2.0 (the "License"); you may not use this file
  16  *   except in compliance with the License. You may obtain a copy of
  17  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  18  */
  19
  20
  21 #include <sal/config.h>
  22
  23 #include <o3tl/string_view.hxx>
  24 #include <rtl/ustring.hxx>
  25
  26 #include <dp_version.hxx>
  27
  28 namespace {
  29
  30 std::u16string_view getElement(std::u16string_view version, std::size_t * index)
  31 {
  32     while (*index < version.size() && version[*index] == '0') {
  33         ++*index;
  34     }
  35     return o3tl::getToken(version, u'.', *index);
  36 }
  37
  38 }
  39
  40 namespace dp_misc {
  41
  42 ::dp_misc::Order compareVersions(
  43     std::u16string_view version1, std::u16string_view version2)
  44 {
  45     for (size_t i1 = 0, i2 = 0; i1 != std::u16string_view::npos || i2 != std::u16string_view::npos;) {
  46         std::u16string_view e1(i1 != std::u16string_view::npos ? getElement(version1, &i1) : std::u16string_view());
  47         std::u16string_view e2(i2 != std::u16string_view::npos ? getElement(version2, &i2) : std::u16string_view());
  48         if (e1.size() < e2.size()) {
  49             return ::dp_misc::LESS;
  50         } else if (e1.size() > e2.size()) {
  51             return ::dp_misc::GREATER;
  52         } else if (e1 < e2) {
  53             return ::dp_misc::LESS;
  54         } else if (e1 > e2) {
  55             return ::dp_misc::GREATER;
  56         }
  57     }
  58     return ::dp_misc::EQUAL;
  59 }
  60
  61
  62 }
  63
  64 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */