Clang: Extract highlighting information

Prepare the move of the semantic highlighting to the clang back end. We
have it under tests too so it should be quite easy to make changes or
corrections.

Change-Id: I5706a8a06fde5a9ba2eba3a8ba62782102ac0bd3
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@theqtcompany.com>

src/tools/clangbackend/ipcsource/sourcerange.cpp

@@ -32,6 +32,8 @@
 
 #include <sourcerangecontainer.h>
 
+#include <ostream>
+
 namespace ClangBackEnd {
 
 SourceRange::SourceRange()
@@ -39,6 +41,11 @@ SourceRange::SourceRange()
 {
 }
 
+SourceRange::SourceRange(const SourceLocation &start, const SourceLocation &end)
+    : cxSourceRange(clang_getRange(start, end))
+{
+}
+
 bool SourceRange::isNull() const
 {
     return clang_Range_isNull(cxSourceRange);
@@ -65,10 +72,33 @@ SourceRangeContainer SourceRange::toSourceRangeContainer() const
                                 end().toSourceLocationContainer());
 }
 
+ClangBackEnd::SourceRange::operator SourceRangeContainer() const
+{
+    return toSourceRangeContainer();
+}
+
+ClangBackEnd::SourceRange::operator CXSourceRange() const
+{
+    return cxSourceRange;
+}
+
 SourceRange::SourceRange(CXSourceRange cxSourceRange)
     : cxSourceRange(cxSourceRange)
 {
 }
 
+bool operator==(const SourceRange &first, const SourceRange &second)
+{
+    return clang_equalRanges(first.cxSourceRange, second.cxSourceRange);
+}
+
+void PrintTo(const SourceRange &sourceRange, ::std::ostream* os)
+{
+    *os << "[";
+    PrintTo(sourceRange.start(), os);
+    *os << ", ";
+    PrintTo(sourceRange.end(), os);
+    *os << "]";
+}
 } // namespace ClangBackEnd