shiboken: Make the indentor helper class more flexible

Move it to a separate header and turn it into a non-type template with
a tabWidth parameter to make it possible to use it with arbitrary tab
widths.

Turn it into a non-type template taking the tab width.

Change-Id: Ib2b6a7379ce66d1a22e73b4cb6a4a9a9b457014d
Reviewed-by: Cristian Maureira-Fredes <cristian.maureira-fredes@qt.io>

1 files changed, 85 insertions, 0 deletions

diff --git a/sources/shiboken2/generator/indentor.h b/sources/shiboken2/generator/indentor.h
new file mode 100644
index 000000000..111259f12
--- /dev/null
+++ b/sources/shiboken2/generator/indentor.h
@@ -0,0 +1,85 @@
+/****************************************************************************
+**
+** Copyright (C) 2019 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of Qt for Python.
+**
+** $QT_BEGIN_LICENSE:GPL-EXCEPT$
+** 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.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef INDENTOR_H
+#define INDENTOR_H
+
+#include <QtCore/QTextStream>
+
+/**
+* Utility class to store the indentation level, use it in a QTextStream.
+*/
+
+template <int tabWidth>
+class IndentorBase
+{
+public:
+    int total() const { return tabWidth * indent; }
+
+    int indent = 0;
+};
+
+using Indentor = IndentorBase<4>;
+using Indentor1 = IndentorBase<1>;
+
+/**
+*   Class that use the RAII idiom to set and unset the indentation level.
+*/
+
+template <int tabWidth>
+class IndentationBase
+{
+public:
+    using Indentor = IndentorBase<tabWidth>;
+
+    IndentationBase(Indentor &indentor, int count = 1) : m_count(count), indentor(indentor)
+    {
+        indentor.indent += m_count;
+    }
+
+    ~IndentationBase()
+    {
+        indentor.indent -= m_count;
+    }
+
+private:
+    const int m_count;
+    Indentor &indentor;
+};
+
+using Indentation = IndentationBase<4>;
+
+template <int tabWidth>
+inline QTextStream &operator <<(QTextStream &s, const IndentorBase<tabWidth> &indentor)
+{
+    for (int i = 0, total = indentor.total(); i < total; ++i)
+        s << ' ';
+    return s;
+}
+
+#endif // GENERATOR_H