Introduced token caching to prevent repetetive tokenizing.

Also removed TokenUnderCursor as it's functionality is in the token cache.

Reviewed-by: ckamm

src/plugins/cpptools/cppmodelmanagerinterface.h

@@ -44,16 +44,25 @@ namespace Core {
 
 namespace CPlusPlus {
     class LookupContext;
+    class TokenCache;
 }
 
 namespace ProjectExplorer {
     class Project;
 }
 
+namespace TextEditor {
+    class ITextEditor;
+}
+
 namespace CppTools {
 
 class AbstractEditorSupport;
 
+namespace Internal {
+class CppEditorSupport;
+}
+
 class CPPTOOLS_EXPORT CppModelManagerInterface : public QObject
 {
     Q_OBJECT
@@ -136,6 +145,8 @@ public:
 
     virtual void findMacroUsages(const CPlusPlus::Macro &macro) = 0;
 
+    virtual CPlusPlus::TokenCache *tokenCache(TextEditor::ITextEditor *editor) const = 0;
+
 Q_SIGNALS:
     void documentUpdated(CPlusPlus::Document::Ptr doc);