support transformers with an unknown number of outputs

To support different types of nodes in the build graph, we introduce
the base class BuildGraphNode. Artifact now derives from BuildGraphNode.
A RuleNode class is introduced that represents a rule in the build graph.
Rules are applied in the build phase and not in a pre-build phase
anymore.
The handling of moc has been revisited. The fixed automoc pre-build
phase is no more.

This is the squashed merge of a feature branch.

Task-number: QBS-370
Change-Id: If27cdc51cba8c9542e4282c2caa456faa723aeff
Reviewed-by: Christian Kandeler <christian.kandeler@digia.com>

1 files changed, 76 insertions, 0 deletions

diff --git a/src/lib/corelib/buildgraph/qtmocscanner.h b/src/lib/corelib/buildgraph/qtmocscanner.h
new file mode 100644
index 000000000..60983fe06
--- /dev/null
+++ b/src/lib/corelib/buildgraph/qtmocscanner.h
@@ -0,0 +1,76 @@
+/****************************************************************************
+**
+** 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.
+**
+****************************************************************************/
+
+#ifndef QBS_QTMOCSCANNER_H
+#define QBS_QTMOCSCANNER_H
+
+#include <language/language.h>
+#include <logging/logger.h>
+
+#include <QHash>
+#include <QScriptValue>
+#include <QString>
+
+QT_BEGIN_NAMESPACE
+class QScriptContext;
+QT_END_NAMESPACE
+
+class ScannerPlugin;
+
+namespace qbs {
+namespace Internal {
+
+class Artifact;
+class ScanResultCache;
+
+class QtMocScanner
+{
+public:
+    explicit QtMocScanner(const ResolvedProductPtr &product, QScriptValue targetScriptValue,
+            const Logger &logger);
+    ~QtMocScanner();
+
+private:
+    void findIncludedMocCppFiles();
+    static QScriptValue js_apply(QScriptContext *ctx, QScriptEngine *engine, void *data);
+    QScriptValue apply(QScriptEngine *engine, const Artifact *artifact);
+
+    const ResolvedProductPtr &m_product;
+    QScriptValue m_targetScriptValue;
+    const Logger &m_logger;
+    ScanResultCache *m_scanResultCache;
+    QHash<QString, QString> m_includedMocCppFiles;
+    ScannerPlugin *m_cppScanner;
+    ScannerPlugin *m_hppScanner;
+};
+
+} // namespace Internal
+} // namespace qbs
+
+#endif // QBS_QTMOCSCANNER_H