Clang: Use CppHoverHandler for diagnostic tooltips

We used to call QTextCharFormat::setToolTip from the ExtraSelection to
install the diagnostic tooltip. Since this allows to set only text
tooltips and we would like to introduce a custom tooltip widget for
diagnostics, make use of CppHoverHandler, which is more flexible.

Change-Id: Ia1b2c3c50810596ce4a3a025002e6e4efd8789db
Reviewed-by: Alessandro Portale <alessandro.portale@theqtcompany.com>

src/plugins/clangcodemodel/clangisdiagnosticrelatedtolocation.h

@@ -0,0 +1,78 @@
+/****************************************************************************
+**
+** Copyright (C) 2016 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of Qt Creator.
+**
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3 as published by the Free Software
+** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-3.0.html.
+**
+****************************************************************************/
+
+#pragma once
+
+#include <clangbackendipc/diagnosticcontainer.h>
+
+namespace ClangCodeModel {
+namespace Internal {
+
+bool isWithinRange(const ClangBackEnd::SourceRangeContainer &range,
+                   uint line,
+                   uint column)
+{
+    const ClangBackEnd::SourceLocationContainer startLocation = range.start();
+    const ClangBackEnd::SourceLocationContainer endLocation = range.end();
+
+    return startLocation.line() <= line
+        && startLocation.column() <= column
+        && line <= endLocation.line()
+        && column <= endLocation.column();
+}
+
+bool isWithinOneRange(const QVector<ClangBackEnd::SourceRangeContainer> &ranges,
+                      uint line,
+                      uint column)
+{
+    foreach (const ClangBackEnd::SourceRangeContainer &range, ranges) {
+        if (isWithinRange(range, line, column))
+            return true;
+    }
+
+    return false;
+}
+
+bool isDiagnosticRelatedToLocation(const ClangBackEnd::DiagnosticContainer &diagnostic,
+                                   const QVector<ClangBackEnd::SourceRangeContainer> &additionalRanges,
+                                   uint line,
+                                   uint column)
+{
+    const ClangBackEnd::SourceLocationContainer location = diagnostic.location();
+
+    if (location.line() == line && location.column() == column)
+        return true;
+
+    if (isWithinOneRange(additionalRanges, line, column))
+        return true;
+
+    if (isWithinOneRange(diagnostic.ranges(), line, column))
+        return true;
+
+    return false;
+}
+
+} // namespace Internal
+} // namespace ClangCodeModel