QmlJS: Add ComponentVersion class to simplify dealing with versions.

src/libs/qmljs/qmljscomponentversion.cpp

@@ -0,0 +1,50 @@
+#include "qmljscomponentversion.h"
+
+using namespace QmlJS;
+
+const int ComponentVersion::NoVersion = -1;
+
+ComponentVersion::ComponentVersion()
+    : _major(NoVersion), _minor(NoVersion)
+{
+}
+
+ComponentVersion::ComponentVersion(int major, int minor)
+    : _major(major), _minor(minor)
+{
+}
+
+ComponentVersion::~ComponentVersion()
+{
+}
+
+bool ComponentVersion::isValid() const
+{
+    return _major >= 0 && _minor >= 0;
+}
+
+namespace QmlJS {
+
+bool operator<(const ComponentVersion &lhs, const ComponentVersion &rhs)
+{
+    return lhs.major() < rhs.major()
+            || (lhs.major() == rhs.major() && lhs.minor() < rhs.minor());
+}
+
+bool operator<=(const ComponentVersion &lhs, const ComponentVersion &rhs)
+{
+    return lhs.major() < rhs.major()
+            || (lhs.major() == rhs.major() && lhs.minor() <= rhs.minor());
+}
+
+bool operator==(const ComponentVersion &lhs, const ComponentVersion &rhs)
+{
+    return lhs.major() == rhs.major() && lhs.minor() == rhs.minor();
+}
+
+bool operator!=(const ComponentVersion &lhs, const ComponentVersion &rhs)
+{
+    return !(lhs == rhs);
+}
+
+}