1 files changed, 114 insertions, 0 deletions
diff --git a/src/plugins/mesonprojectmanager/mesoninfoparser/parsers/common.h b/src/plugins/mesonprojectmanager/mesoninfoparser/parsers/common.h
new file mode 100644
index 0000000000..a5113a7700
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+++ b/src/plugins/mesonprojectmanager/mesoninfoparser/parsers/common.h
@@ -0,0 +1,114 @@
+/****************************************************************************
+**
+** Copyright (C) 2020 Alexis Jeandet.
+** 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 <utils/optional.h>
+#include <QFile>
+#include <QJsonArray>
+#include <QJsonDocument>
+#include <QJsonObject>
+#include <QJsonValue>
+
+namespace MesonProjectManager {
+namespace Internal {
+
+template<typename T>
+inline T load(QJsonDocument &&doc);
+
+template<>
+inline QJsonArray load<QJsonArray>(QJsonDocument &&doc)
+{
+    return doc.array();
+}
+
+template<>
+inline QJsonObject load<QJsonObject>(QJsonDocument &&doc)
+{
+    return doc.object();
+}
+
+template<typename T>
+inline T load(const QJsonValueRef &ref);
+
+template<>
+inline QJsonArray load<QJsonArray>(const QJsonValueRef &ref)
+{
+    return ref.toArray();
+}
+
+template<>
+inline QJsonObject load<QJsonObject>(const QJsonValueRef &ref)
+{
+    return ref.toObject();
+}
+
+template<typename T>
+inline Utils::optional<T> load(const QString &jsonFile)
+{
+    QFile js(jsonFile);
+    js.open(QIODevice::ReadOnly | QIODevice::Text);
+    if (js.isOpen()) {
+        auto data = js.readAll();
+        return load<T>(QJsonDocument::fromJson(data));
+    }
+    return Utils::nullopt;
+}
+
+template<typename T>
+inline Utils::optional<T> get(const QJsonObject &obj, const QString &name);
+
+template<>
+inline Utils::optional<QJsonArray> get<QJsonArray>(const QJsonObject &obj, const QString &name)
+{
+    if (obj.contains(name)) {
+        auto child = obj[name];
+        if (child.isArray())
+            return child.toArray();
+    }
+    return Utils::nullopt;
+}
+
+template<>
+inline Utils::optional<QJsonObject> get<QJsonObject>(const QJsonObject &obj, const QString &name)
+{
+    if (obj.contains(name)) {
+        auto child = obj[name];
+        if (child.isObject())
+            return child.toObject();
+    }
+    return Utils::nullopt;
+}
+
+template<typename T, typename... Strings>
+inline Utils::optional<T> get(const QJsonObject &obj,
+                              const QString &firstPath,
+                              const Strings &... path)
+{
+    if (obj.contains(firstPath))
+        return get<T>(obj[firstPath].toObject(), path...);
+    return Utils::nullopt;
+}
+
+} // namespace Internal
+} // namespace MesonProjectManager