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diff --git a/src/lib/corelib/language/value.h b/src/lib/corelib/language/value.h
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+++ b/src/lib/corelib/language/value.h
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+/****************************************************************************
+**
+** 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_VALUE_H
+#define QBS_VALUE_H
+
+#include "filecontext.h"
+#include "item.h"
+#include <tools/codelocation.h>
+#include <QVariant>
+
+namespace qbs {
+namespace Internal {
+
+class ValueHandler;
+
+class Value
+{
+public:
+    enum Type
+    {
+        JSSourceValueType,
+        ItemValueType,
+        VariantValueType,
+        BuiltinValueType
+    };
+
+    Value(Type t);
+    virtual ~Value();
+
+    Type type() const { return m_type; }
+    virtual void apply(ValueHandler *) = 0;
+    virtual CodeLocation location() const { return CodeLocation(); }
+
+private:
+    Type m_type;
+};
+
+class ValueHandler
+{
+public:
+    virtual void handle(JSSourceValue *value) = 0;
+    virtual void handle(ItemValue *value) = 0;
+    virtual void handle(VariantValue *value) = 0;
+    virtual void handle(BuiltinValue *value) = 0;
+};
+
+class JSSourceValue : public Value
+{
+    friend class ItemReaderASTVisitor;
+    JSSourceValue();
+public:
+    static JSSourceValuePtr create();
+    ~JSSourceValue();
+
+    void apply(ValueHandler *handler) { handler->handle(this); }
+
+    void setSourceCode(const QString &sourceCode) { m_sourceCode = sourceCode; }
+    const QString &sourceCode() const { return m_sourceCode; }
+
+    void setLocation(const CodeLocation &location) { m_location = location; }
+    CodeLocation location() const { return m_location; }
+
+    void setFile(const FileContextPtr &file) { m_file = file; }
+    const FileContextPtr &file() const { return m_file; }
+
+    bool sourceUsesBase() const { return m_sourceUsesBase; }
+    bool sourceUsesOuter() const { return m_sourceUsesOuter; }
+    bool hasFunctionForm() const { return m_hasFunctionForm; }
+
+    const JSSourceValuePtr &baseValue() const { return m_baseValue; }
+    void setBaseValue(const JSSourceValuePtr &v) { m_baseValue = v; }
+
+    struct Alternative
+    {
+        QString condition;
+        const Item *conditionScopeItem;
+        JSSourceValuePtr value;
+    };
+
+    const QList<Alternative> &alternatives() const { return m_alternatives; }
+    void setAlternatives(const QList<Alternative> &alternatives) { m_alternatives = alternatives; }
+    void addAlternative(const Alternative &alternative) { m_alternatives.append(alternative); }
+
+private:
+    QString m_sourceCode;
+    CodeLocation m_location;
+    FileContextPtr m_file;
+    bool m_sourceUsesBase;
+    bool m_sourceUsesOuter;
+    bool m_hasFunctionForm;
+    JSSourceValuePtr m_baseValue;
+    QList<Alternative> m_alternatives;
+};
+
+class Item;
+
+class ItemValue : public Value
+{
+    ItemValue(Item *item);
+public:
+    static ItemValuePtr create(Item *item = 0);
+    ~ItemValue();
+
+    void apply(ValueHandler *handler) { handler->handle(this); }
+    Item *item() const;
+    void setItem(Item *ptr);
+
+private:
+    Item *m_item;
+};
+
+inline Item *ItemValue::item() const
+{
+    return m_item;
+}
+
+inline void ItemValue::setItem(Item *ptr)
+{
+    m_item = ptr;
+}
+
+
+class VariantValue : public Value
+{
+    VariantValue(const QVariant &v);
+public:
+    static VariantValuePtr create(const QVariant &v = QVariant());
+
+    void apply(ValueHandler *handler) { handler->handle(this); }
+
+    void setValue(const QVariant &v) { m_value = v; }
+    const QVariant &value() const { return m_value; }
+
+private:
+    QVariant m_value;
+};
+
+} // namespace Internal
+} // namespace qbs
+
+#endif // QBS_VALUE_H