1 files changed, 107 insertions, 0 deletions
diff --git a/src/lib/corelib/tools/propertyfinder.cpp b/src/lib/corelib/tools/propertyfinder.cpp
new file mode 100644
index 000000000..96c081f01
--- /dev/null
+++ b/src/lib/corelib/tools/propertyfinder.cpp
@@ -0,0 +1,107 @@
+/****************************************************************************
+**
+** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of the Qt Build Suite.
+**
+** 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 Digia.  For licensing terms and
+** conditions see http://qt.digia.com/licensing.  For further information
+** use the contact form at http://qt.digia.com/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Digia gives you certain additional
+** rights.  These rights are described in the Digia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+****************************************************************************/
+#include "propertyfinder.h"
+
+#include "qbsassert.h"
+
+namespace qbs {
+namespace Internal {
+
+QVariantList PropertyFinder::propertyValues(const QVariantMap &properties,
+        const QString &moduleName, const QString &key, MergeType mergeType)
+{
+    m_moduleName = moduleName;
+    m_key = key;
+    m_values.clear();
+    findModuleValues(properties, true);
+    if (mergeType == DoMergeLists)
+        mergeLists(&m_values);
+    return m_values;
+}
+
+QVariant PropertyFinder::propertyValue(const QVariantMap &properties, const QString &moduleName,
+                                       const QString &key)
+{
+    m_moduleName = moduleName;
+    m_key = key;
+    m_values.clear();
+    findModuleValues(properties, false);
+
+    QBS_ASSERT(m_values.count() <= 1, return QVariant());
+    return m_values.isEmpty() ? QVariant() : m_values.first();
+}
+
+void PropertyFinder::findModuleValues(const QVariantMap &properties, bool searchRecursively)
+{
+    QVariantMap moduleProperties = properties.value(QLatin1String("modules")).toMap();
+
+    // Direct hits come first.
+    const QVariantMap::Iterator modIt = moduleProperties.find(m_moduleName);
+    if (modIt != moduleProperties.end()) {
+        const QVariantMap moduleMap = modIt->toMap();
+        const QVariant property = moduleMap.value(m_key);
+        addToList(property);
+        moduleProperties.erase(modIt);
+    }
+
+    if (!searchRecursively)
+        return;
+
+    // These are the non-matching modules.
+    for (QVariantMap::ConstIterator it = moduleProperties.constBegin();
+         it != moduleProperties.constEnd(); ++it) {
+        findModuleValues(it->toMap(), true);
+    }
+}
+
+void PropertyFinder::addToList(const QVariant &value)
+{
+    // Note: This means that manually setting a property to "null" will not lead to a "hit".
+    if (!value.isNull() && !m_values.contains(value))
+        m_values << value;
+}
+
+void PropertyFinder::mergeLists(QVariantList *values)
+{
+    QVariantList::iterator it = values->begin();
+    while (it != values->end()) {
+        if (it->canConvert<QVariantList>()) {
+            QVariantList sublist = it->toList();
+            mergeLists(&sublist);
+            it = values->erase(it);
+            for (int k = sublist.count(); --k >= 0;)
+                it = values->insert(it, sublist.at(k));
+        } else {
+            ++it;
+        }
+    }
+}
+
+} // namespace Internal
+} // namespace qbs