C++ editor: Better control to stop the semantic highlighter

Done-by: Roberto Raggi
Reviewed-by: Leandro Melo
Reviewed-by: mae

src/shared/cplusplus/Control.h

@@ -54,10 +54,18 @@
 #define CPLUSPLUS_CONTROL_H
 
 #include "CPlusPlusForwardDeclarations.h"
+#include "ASTfwd.h"
 #include "Names.h"
 
 namespace CPlusPlus {
 
+class CPLUSPLUS_EXPORT TopLevelDeclarationProcessor
+{
+public:
+    virtual ~TopLevelDeclarationProcessor() {}
+    virtual bool processDeclaration(DeclarationAST *ast) = 0;
+};
+
 class CPLUSPLUS_EXPORT Control
 {
 public:
@@ -67,6 +75,9 @@ public:
     TranslationUnit *translationUnit() const;
     TranslationUnit *switchTranslationUnit(TranslationUnit *unit);
 
+    TopLevelDeclarationProcessor *topLevelDeclarationProcessor() const;
+    void setTopLevelDeclarationProcessor(TopLevelDeclarationProcessor *processor);
+
     DiagnosticClient *diagnosticClient() const;
     void setDiagnosticClient(DiagnosticClient *diagnosticClient);