Clang: Provide highlighting for identifier under cursor

Change-Id: I80ffe23cbcc84ab7323124581d9dd6afbe974fd0
Reviewed-by: Marco Bubke <marco.bubke@qt.io>

tests/unit/unittest/data/references.cpp

@@ -0,0 +1,159 @@
+void variableSingleReference()
+{
+    int foo;
+}
+
+
+
+int variableMultipleReferences()
+{
+    int foo = 0;
+    return foo;
+}
+
+
+
+class Foo {};
+void bla()
+{
+    Foo foo;
+}
+
+
+
+namespace N { class Bar {}; }
+namespace N { class Baz {}; }
+N::Bar bar;
+
+
+
+namespace G { class App {}; }
+using G::App;
+
+
+
+class Hoo;
+void f(const Hoo &);
+
+
+
+class Moo {};
+void x()
+{
+    new Moo;
+}
+
+
+
+class Element {};
+template<typename T> struct Wrap { T member; };
+void g()
+{
+    Wrap<Element> con;
+    con.member;
+}
+
+
+
+template<typename T>
+struct Wrapper {
+    T f()
+    {
+        int foo;
+        ++foo;
+        return mem;
+    }
+
+    T mem;
+};
+
+
+
+template<typename T>
+void f()
+{
+    T mem;
+    mem.foo();
+}
+
+
+
+struct Woo {
+    Woo();
+    ~Woo();
+};
+
+
+
+int muu();
+int muu(int);
+
+
+
+struct Doo {
+    int muu();
+    int muu(int);
+};
+
+
+
+template<typename T> int tuu();
+int tuu(int);
+
+
+
+struct Xoo {
+    template<typename T> int tuu();
+    int tuu(int);
+};
+
+
+
+enum ET { E1 };
+bool e(ET e)
+{
+    return e == E1;
+}
+
+
+
+struct LData { int member; };
+void lambda(LData foo) {
+    auto l = [bar=foo] { return bar.member; };
+}
+
+
+
+template<class T> class Coo;
+template<class T> class Coo<T*>;
+template<> class Coo<int>;
+
+
+
+template<typename T> typename T::foo n()
+{
+    typename T::bla hello;
+}
+
+
+
+int rec(int n = 100)
+{
+    return n == 0 ? 0 : rec(--n);
+}
+
+
+
+#define FOO 3
+int objectLikeMacro()
+{
+    return FOO;
+}
+
+
+
+#define BAR(x) x
+int functionLikeMacro(int foo)
+{
+    return BAR(foo);
+}