Clang: Refactor handling of diagnostics

...by introducing ClangDiagnosticManager and the helper class
ClangDiagnosticFilter.

ClangDiagnosticManager will get more state in a follow-up change.

Change-Id: Id2c312bc897ea41ed67292b56b24dcfb7975ff4a
Reviewed-by: Marco Bubke <marco.bubke@theqtcompany.com>

src/plugins/clangcodemodel/clangdiagnosticmanager.h

@@ -0,0 +1,78 @@
+/****************************************************************************
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+
+#ifndef CLANGCODEMODEL_INTERNAL_CLANGDIAGNOSTICMANAGER_H
+#define CLANGCODEMODEL_INTERNAL_CLANGDIAGNOSTICMANAGER_H
+
+#include "clangtextmark.h"
+
+#include <clangbackendipc/diagnosticcontainer.h>
+
+#include <QList>
+#include <QTextEdit>
+#include <QVector>
+
+#include <vector>
+
+namespace TextEditor { class TextDocument; }
+
+namespace ClangCodeModel {
+namespace Internal {
+
+class ClangDiagnosticManager
+{
+public:
+    ClangDiagnosticManager(TextEditor::TextDocument *textDocument);
+
+    void processNewDiagnostics(const QVector<ClangBackEnd::DiagnosticContainer> &allDiagnostics);
+
+    QList<QTextEdit::ExtraSelection> takeExtraSelections();
+
+private:
+    QString filePath() const;
+    void filterDiagnostics(const QVector<ClangBackEnd::DiagnosticContainer> &diagnostics);
+    void generateEditorSelections();
+    void generateTextMarks();
+    void addClangTextMarks(const QVector<ClangBackEnd::DiagnosticContainer> &diagnostics);
+    void clearWarningsAndErrors();
+
+private:
+    TextEditor::TextDocument *m_textDocument;
+
+    QVector<ClangBackEnd::DiagnosticContainer> m_warningDiagnostics;
+    QVector<ClangBackEnd::DiagnosticContainer> m_errorDiagnostics;
+    QList<QTextEdit::ExtraSelection> m_extraSelections;
+    std::vector<ClangTextMark> m_clangTextMarks;
+};
+
+} // namespace Internal
+} // namespace ClangCodeModel
+
+#endif // CLANGCODEMODEL_INTERNAL_CLANGDIAGNOSTICMANAGER_H