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e81988481b
Differential Revision: https://phabricator.services.mozilla.com/D17978 --HG-- extra : moz-landing-system : lando
102 lines
3.1 KiB
C++
102 lines
3.1 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef nsVersionComparator_h__
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#define nsVersionComparator_h__
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#include "mozilla/Char16.h"
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#include "nscore.h"
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#include <stdlib.h>
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#include <string.h>
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#include <assert.h>
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#if defined(XP_WIN) && !defined(UPDATER_NO_STRING_GLUE_STL)
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# include <wchar.h>
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# include "nsString.h"
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#endif
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/**
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* In order to compare version numbers in Mozilla, you need to use the
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* mozilla::Version class. You can construct an object of this type by passing
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* in a string version number to the constructor. Objects of this type can be
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* compared using the standard comparison operators.
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*
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* For example, let's say that you want to make sure that a given version
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* number is not older than 15.a2. Here's how you would write a function to
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* do that.
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*
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* bool IsVersionValid(const char* version) {
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* return mozilla::Version("15.a2") <= mozilla::Version(version);
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* }
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*
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* Or, since Version's constructor is implicit, you can simplify this code:
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*
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* bool IsVersionValid(const char* version) {
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* return mozilla::Version("15.a2") <= version;
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* }
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*/
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namespace mozilla {
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int32_t CompareVersions(const char* aStrA, const char* aStrB);
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#ifdef XP_WIN
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int32_t CompareVersions(const char16_t* aStrA, const char16_t* aStrB);
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#endif
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struct Version {
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explicit Version(const char* aVersionString) {
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versionContent = strdup(aVersionString);
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}
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const char* ReadContent() const { return versionContent; }
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~Version() { free(versionContent); }
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bool operator<(const Version& aRhs) const {
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return CompareVersions(versionContent, aRhs.ReadContent()) < 0;
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}
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bool operator<=(const Version& aRhs) const {
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return CompareVersions(versionContent, aRhs.ReadContent()) < 1;
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}
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bool operator>(const Version& aRhs) const {
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return CompareVersions(versionContent, aRhs.ReadContent()) > 0;
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}
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bool operator>=(const Version& aRhs) const {
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return CompareVersions(versionContent, aRhs.ReadContent()) > -1;
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}
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bool operator==(const Version& aRhs) const {
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return CompareVersions(versionContent, aRhs.ReadContent()) == 0;
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}
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bool operator!=(const Version& aRhs) const {
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return CompareVersions(versionContent, aRhs.ReadContent()) != 0;
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}
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bool operator<(const char* aRhs) const {
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return CompareVersions(versionContent, aRhs) < 0;
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}
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bool operator<=(const char* aRhs) const {
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return CompareVersions(versionContent, aRhs) < 1;
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}
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bool operator>(const char* aRhs) const {
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return CompareVersions(versionContent, aRhs) > 0;
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}
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bool operator>=(const char* aRhs) const {
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return CompareVersions(versionContent, aRhs) > -1;
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}
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bool operator==(const char* aRhs) const {
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return CompareVersions(versionContent, aRhs) == 0;
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}
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bool operator!=(const char* aRhs) const {
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return CompareVersions(versionContent, aRhs) != 0;
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}
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private:
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char* versionContent;
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};
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} // namespace mozilla
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#endif // nsVersionComparator_h__
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