/****************************************************************************
**
** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of Qt Creator.
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** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
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****************************************************************************/

#ifndef QMLJS_CONTEXT_H
#define QMLJS_CONTEXT_H

#include "qmljs_global.h"
#include "qmljsvalueowner.h"

#include <QSharedPointer>

namespace QmlJS {

class Document;
class Snapshot;
class Context;
typedef QSharedPointer<const Context> ContextPtr;

// shared among threads, completely threadsafe
class QMLJS_EXPORT Context
{
    Q_DISABLE_COPY(Context)
public:
    typedef QHash<const Document *, QSharedPointer<const Imports> > ImportsPerDocument;

    // Context takes ownership of valueOwner
    static ContextPtr create(const Snapshot &snapshot, ValueOwner *valueOwner, const ImportsPerDocument &imports);
    ~Context();

    ContextPtr ptr() const;

    ValueOwner *valueOwner() const;
    Snapshot snapshot() const;

    const Imports *imports(const Document *doc) const;

    const ObjectValue *lookupType(const Document *doc, AST::UiQualifiedId *qmlTypeName,
                                  AST::UiQualifiedId *qmlTypeNameEnd = 0) const;
    const ObjectValue *lookupType(const Document *doc, const QStringList &qmlTypeName) const;
    const Value *lookupReference(const Value *value) const;

    QString defaultPropertyName(const ObjectValue *object) const;

private:
    // Context takes ownership of valueOwner
    Context(const Snapshot &snapshot, ValueOwner *valueOwner, const ImportsPerDocument &imports);

    Snapshot _snapshot;
    QSharedPointer<ValueOwner> _valueOwner;
    ImportsPerDocument _imports;
    QWeakPointer<const Context> _ptr;
};

// for looking up references
class QMLJS_EXPORT ReferenceContext
{
public:
    // implicit conversion ok
    ReferenceContext(const ContextPtr &context);

    const Value *lookupReference(const Value *value);

    const ContextPtr &context() const;
    operator const ContextPtr &() const;

private:
    const ContextPtr &m_context;
    QList<const Reference *> m_references;
};

} // namespace QmlJS

#endif // QMLJS_CONTEXT_H
