зеркало из https://github.com/mozilla/gecko-dev.git
150 строки
3.6 KiB
C++
150 строки
3.6 KiB
C++
/* 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 "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 "nsStringGlue.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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* On Windows, if your version strings are wide characters, you should use the
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* mozilla::VersionW variant instead. The semantics of that class is the same
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* as Version.
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*/
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namespace mozilla {
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int32_t NS_COM_GLUE
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CompareVersions(const char *A, const char *B);
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#ifdef XP_WIN
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int32_t NS_COM_GLUE
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CompareVersions(const PRUnichar *A, const PRUnichar *B);
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#endif
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struct NS_COM_GLUE Version
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{
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Version(const char* versionString)
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{
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versionContent = strdup(versionString);
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}
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const char* ReadContent() const
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{
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return versionContent;
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}
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~Version()
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{
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free(versionContent);
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}
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bool operator< (const Version& rhs) const
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{
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return CompareVersions(versionContent, rhs.ReadContent()) == -1;
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}
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bool operator<= (const Version& rhs) const
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{
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return CompareVersions(versionContent, rhs.ReadContent()) < 1;
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}
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bool operator> (const Version& rhs) const
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{
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return CompareVersions(versionContent, rhs.ReadContent()) == 1;
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}
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bool operator>= (const Version& rhs) const
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{
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return CompareVersions(versionContent, rhs.ReadContent()) > -1;
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}
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bool operator== (const Version& rhs) const
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{
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return CompareVersions(versionContent, rhs.ReadContent()) == 0;
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}
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bool operator!= (const Version& rhs) const
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{
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return CompareVersions(versionContent, rhs.ReadContent()) != 0;
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}
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private:
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char* versionContent;
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};
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#ifdef XP_WIN
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struct NS_COM_GLUE VersionW
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{
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VersionW(const PRUnichar *versionStringW)
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{
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versionContentW = wcsdup(versionStringW);
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}
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const PRUnichar* ReadContentW() const
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{
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return versionContentW;
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}
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~VersionW()
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{
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free(versionContentW);
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}
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bool operator< (const VersionW& rhs) const
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{
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return CompareVersions(versionContentW, rhs.ReadContentW()) == -1;
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}
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bool operator<= (const VersionW& rhs) const
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{
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return CompareVersions(versionContentW, rhs.ReadContentW()) < 1;
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}
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bool operator> (const VersionW& rhs) const
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{
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return CompareVersions(versionContentW, rhs.ReadContentW()) == 1;
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}
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bool operator>= (const VersionW& rhs) const
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{
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return CompareVersions(versionContentW, rhs.ReadContentW()) > -1;
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}
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bool operator== (const VersionW& rhs) const
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{
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return CompareVersions(versionContentW, rhs.ReadContentW()) == 0;
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}
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bool operator!= (const VersionW& rhs) const
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{
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return CompareVersions(versionContentW, rhs.ReadContentW()) != 0;
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}
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private:
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PRUnichar* versionContentW;
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};
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#endif
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} // namespace mozilla
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#endif // nsVersionComparator_h__
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