/****************************************************************************
**
** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the QtScript module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** 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.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
**
** $QT_END_LICENSE$
**
****************************************************************************/

#ifndef QSCRIPTENGINEFWD_P_H
#define QSCRIPTENGINEFWD_P_H

#ifndef QT_NO_QOBJECT
#include "private/qobject_p.h"
#endif

#ifndef QT_NO_SCRIPT

#include <QtCore/qobjectdefs.h>

#include <QtCore/QHash>
#include <QtCore/QList>
#include <QtCore/QRegExp>
#include <QtCore/QSet>
#include <QtCore/QStringList>
#include <QtCore/QTime>
#include <QtCore/QVector>

#include "qscriptengine.h"
#include "qscriptrepository_p.h"
#include "qscriptgc_p.h"
#include "qscriptobjectfwd_p.h"
#include "qscriptclassinfo_p.h"
#include "qscriptstring_p.h"

QT_BEGIN_NAMESPACE

//
//  W A R N I N G
//  -------------
//
// This file is not part of the Qt API.  It exists purely as an
// implementation detail.  This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//

class QScriptClass;
class QScriptContext;

namespace QScript {

namespace AST {
    class Node;
} // namespace AST

namespace Ecma {
    class Object;
    class Number;
    class Boolean;
    class String;
    class Math;
    class Date;
    class Function;
    class Array;
    class RegExp;
    class Error;
} // namespace Ecma

namespace Ext {
    class Enumeration;
    class Variant;
} // namespace Ext

class ExtQObject;
class ExtQMetaObject;

class Array;
class Lexer;
class Code;
class CompilationUnit;
class IdTable;
class MemoryPool;

class IdTable
{
public:
    inline IdTable()
        : id_constructor(0), id_false(0), id_null(0),
          id_object(0), id_pointer(0), id_prototype(0),
          id_arguments(0), id_this(0), id_toString(0),
          id_true(0), id_undefined(0), id_valueOf(0),
          id_length(0), id_callee(0), id___proto__(0),
          id___qt_sender__(0)
    {}

    QScriptNameIdImpl *id_constructor;
    QScriptNameIdImpl *id_false;
    QScriptNameIdImpl *id_null;
    QScriptNameIdImpl *id_object;
    QScriptNameIdImpl *id_pointer;
    QScriptNameIdImpl *id_prototype;
    QScriptNameIdImpl *id_arguments;
    QScriptNameIdImpl *id_this;
    QScriptNameIdImpl *id_toString;
    QScriptNameIdImpl *id_true;
    QScriptNameIdImpl *id_undefined;
    QScriptNameIdImpl *id_valueOf;
    QScriptNameIdImpl *id_length;
    QScriptNameIdImpl *id_callee;
    QScriptNameIdImpl *id___proto__;
    QScriptNameIdImpl *id___qt_sender__;
};

} // namespace QScript

#ifndef QT_NO_QOBJECT
class QScriptQObjectData;
class QScriptMetaObject;
#endif

class QScriptCustomTypeInfo
{
public:
    QScriptCustomTypeInfo() : signature(0, '\0'), marshal(0), demarshal(0)
    { prototype.invalidate(); }

    QByteArray signature;
    QScriptEngine::MarshalFunction marshal;
    QScriptEngine::DemarshalFunction demarshal;
    QScriptValueImpl prototype;
};

class QScriptEnginePrivate
#ifndef QT_NO_QOBJECT
    : public QObjectPrivate
#endif
{
    Q_DECLARE_PUBLIC(QScriptEngine)

    enum {
        DefaultHashSize = 1021
    };

public:
    QScriptEnginePrivate();
    virtual ~QScriptEnginePrivate();

    void init();
    void initStringRepository();

    static inline QScriptEnginePrivate *get(QScriptEngine *q);
    static inline const QScriptEnginePrivate *get(const QScriptEngine *q);
    static inline QScriptEngine *get(QScriptEnginePrivate *d);

    QScript::AST::Node *createAbstractSyntaxTree(
        const QString &source, int lineNumber,
        QString *errorMessage, int *errorLineNumber);
    QScript::AST::Node *changeAbstractSyntaxTree(QScript::AST::Node *program);

    inline QScript::AST::Node *abstractSyntaxTree() const;
    inline bool hasUncaughtException() const;
    inline QScriptValueImpl uncaughtException() const;
    QStringList uncaughtExceptionBacktrace() const;
    void clearExceptions();
#ifndef QT_NO_QOBJECT
    void emitSignalHandlerException();
#endif

    static bool canEvaluate(const QString &program);
    static QScriptSyntaxCheckResult checkSyntax(const QString &program);

    inline QScriptContextPrivate *currentContext() const;
    inline QScriptContextPrivate *pushContext();
    inline void popContext();

    inline QScript::MemoryPool *nodePool();
    inline QScript::Lexer *lexer();
    inline QScriptObject *allocObject();

    inline void maybeGC();

    void maybeGC_helper(bool do_string_gc);

    inline bool blockGC(bool block);

    void gc();
    bool isCollecting() const;
    void processMarkStack(int generation);

    inline void adjustBytesAllocated(int bytes);

    void markObject(const QScriptValueImpl &object, int generation);
    void markFrame(QScriptContextPrivate *context, int generation);

    inline void markString(QScriptNameIdImpl *id, int generation);

    inline QScriptValueImpl createFunction(QScriptFunction *fun);
    inline QScriptValueImpl newArray(const QScript::Array &value);
    inline QScriptValueImpl newArray(uint length = 0);

    void evaluate(QScriptContextPrivate *context, const QString &contents,
                  int lineNumber, const QString &fileName = QString());

    inline void setLexer(QScript::Lexer *lexer);

    inline void setNodePool(QScript::MemoryPool *pool);

    inline QScriptClassInfo *registerClass(const QString &pname, int type);

    inline QScriptClassInfo *registerClass(const QString &name);

    int registerCustomClassType();

    inline QScriptValueImpl createFunction(QScriptInternalFunctionSignature fun,
                                           int length, QScriptClassInfo *classInfo,
                                           const QString &name = QString());

    static inline QString toString(QScriptNameIdImpl *id);
    inline QString memberName(const QScript::Member &member) const;
    inline void newReference(QScriptValueImpl *object, int mode);
    inline void newActivation(QScriptValueImpl *object);
    inline void newFunction(QScriptValueImpl *object, QScriptFunction *function);
    inline void newConstructor(QScriptValueImpl *ctor, QScriptFunction *function,
                        QScriptValueImpl &proto);
    inline void newInteger(QScriptValueImpl *object, int i);
    inline void newPointer(QScriptValueImpl *object, void *ptr);
    inline void newNameId(QScriptValueImpl *object, const QString &s);
    inline void newNameId(QScriptValueImpl *object, QScriptNameIdImpl *id);
    inline void newString(QScriptValueImpl *object, const QString &s);
    inline void newArguments(QScriptValueImpl *object, const QScriptValueImpl &activation,
                      uint length, const QScriptValueImpl &callee);
    static inline QString convertToNativeString(const QScriptValueImpl &value);
    static QString convertToNativeString_helper(const QScriptValueImpl &value);
    static inline qsreal convertToNativeDouble(const QScriptValueImpl &value);
    static qsreal convertToNativeDouble_helper(const QScriptValueImpl &value);
    static inline bool convertToNativeBoolean(const QScriptValueImpl &value);
    static bool convertToNativeBoolean_helper(const QScriptValueImpl &value);
    static inline qint32 convertToNativeInt32(const QScriptValueImpl &value);
    static inline QScriptFunction *convertToNativeFunction(const QScriptValueImpl &value);

    inline QScriptValue toPublic(const QScriptValueImpl &value);
    inline QScriptValueImpl toImpl(const QScriptValue &value);
    QScriptValueImpl toImpl_helper(const QScriptValue &value);
    inline QScriptValueImplList toImplList(const QScriptValueList &lst);

    inline const QScript::IdTable *idTable() const;

    inline QScriptValueImpl toObject(const QScriptValueImpl &value);
    QScriptValueImpl toObject_helper(const QScriptValueImpl &value);

    inline QScriptValueImpl toPrimitive(const QScriptValueImpl &object,
                                        QScriptValueImpl::TypeHint hint = QScriptValueImpl::NoTypeHint);
    QScriptValueImpl toPrimitive_helper(const QScriptValueImpl &object,
                                        QScriptValueImpl::TypeHint hint);

    static const qsreal D16;
    static const qsreal D32;

    inline static qsreal toInteger(qsreal n);
    inline static qint32 toInt32(qsreal m);
    inline static quint32 toUint32(qsreal n);
    inline static quint16 toUint16(qsreal n);

    inline QDateTime toDateTime(const QScriptValueImpl &value) const;

    inline void newArray(QScriptValueImpl *object, const QScript::Array &value);

    inline void newObject(QScriptValueImpl *o, const QScriptValueImpl &proto,
                          QScriptClassInfo *oc = 0);
    inline void newObject(QScriptValueImpl *o, QScriptClassInfo *oc = 0);
    QScriptValueImpl newObject(QScriptClass *scriptClass, const QScriptValueImpl &data);

    inline QScriptValueImpl newObject();

    inline void newVariant(QScriptValueImpl *out, const QVariant &value,
                           bool setDefaultPrototype = true);

#ifndef QT_NO_QOBJECT
    void newQObject(QScriptValueImpl *out, QObject *object,
                    QScriptEngine::ValueOwnership ownership = QScriptEngine::QtOwnership,
                    const QScriptEngine::QObjectWrapOptions &options = 0,
                    bool setDefaultPrototype = true);

# ifndef Q_SCRIPT_NO_QMETAOBJECT_CACHE
    inline QScriptMetaObject *cachedMetaObject(const QMetaObject *meta);
# endif
#endif

    inline QScriptNameIdImpl *nameId(const QString &str, bool persistent = false);

    inline QScriptNameIdImpl *intern(const QChar *u, int s);

    QScriptString internedString(const QString &str);
    QScriptString internedString(QScriptNameIdImpl *nid);
    void uninternString(QScriptStringPrivate *d);

    inline QScriptValueImpl valueFromVariant(const QVariant &v);

    inline QScriptValueImpl undefinedValue();

    inline QScriptValueImpl nullValue();

    inline QScriptValueImpl defaultPrototype(int metaTypeId) const;

    inline void setDefaultPrototype(int metaTypeId, const QScriptValueImpl &prototype);

    QScriptValueImpl call(const QScriptValueImpl &callee, const QScriptValueImpl &thisObject,
                          const QScriptValueImplList &args, bool asConstructor);
    QScriptValueImpl call(const QScriptValueImpl &callee, const QScriptValueImpl &thisObject,
                          const QScriptValueImpl &args, bool asConstructor);

    void rehashStringRepository(bool resize = true);
    inline QScriptNameIdImpl *toStringEntry(const QString &s);
    QScriptNameIdImpl *insertStringEntry(const QString &s);

    QScriptValueImpl create(int type, const void *ptr);
    static bool convert(const QScriptValueImpl &value, int type, void *ptr,
                        QScriptEnginePrivate *eng);

    QScriptValueImpl arrayFromStringList(const QStringList &lst);
    static QStringList stringListFromArray(const QScriptValueImpl &arr);

    QScriptValueImpl arrayFromVariantList(const QVariantList &lst);
    static QVariantList variantListFromArray(const QScriptValueImpl &arr);

    QScriptValueImpl objectFromVariantMap(const QVariantMap &vmap);
    static QVariantMap variantMapFromObject(const QScriptValueImpl &obj);

    static inline bool lessThan(const QScriptValueImpl &lhs, const QScriptValueImpl &rhs);
    static inline bool equals(const QScriptValueImpl &lhs, const QScriptValueImpl &rhs);
    static inline bool strictlyEquals(const QScriptValueImpl &lhs, const QScriptValueImpl &rhs);

    QScriptValuePrivate *registerValue(const QScriptValueImpl &value);
    inline void unregisterValue(QScriptValuePrivate *p);

    inline QScriptValueImpl globalObject() const;

    QScriptValueImpl objectById(qint64 id) const;

    QScriptValueImpl importExtension(const QString &extension);
    QStringList availableExtensions() const;
    QStringList importedExtensions() const;

    inline void maybeProcessEvents();
    void setupProcessEvents();
    void processEvents();

#ifndef QT_NO_QOBJECT
    QScriptQObjectData *qobjectData(QObject *object);

    bool scriptConnect(QObject *sender, const char *signal,
                       const QScriptValueImpl &receiver,
                       const QScriptValueImpl &function);
    bool scriptDisconnect(QObject *sender, const char *signal,
                          const QScriptValueImpl &receiver,
                          const QScriptValueImpl &function);

    bool scriptConnect(QObject *sender, int index,
                       const QScriptValueImpl &receiver,
                       const QScriptValueImpl &function,
                       const QScriptValueImpl &senderWrapper = QScriptValueImpl());
    bool scriptDisconnect(QObject *sender, int index,
                          const QScriptValueImpl &receiver,
                          const QScriptValueImpl &function);

    bool scriptConnect(const QScriptValueImpl &signal,
                       const QScriptValueImpl &receiver,
                       const QScriptValueImpl &function);
    bool scriptDisconnect(const QScriptValueImpl &signal,
                          const QScriptValueImpl &receiver,
                          const QScriptValueImpl &function);

    void _q_objectDestroyed(QObject *object);

    void disposeQObject(QObject *object);
    void deletePendingQObjects();

    static bool convertToNativeQObject(const QScriptValueImpl &value,
                                       const QByteArray &targetType,
                                       void **result);
#endif

    void abortEvaluation(const QScriptValueImpl &result);
    inline bool shouldAbort() const;
    inline void resetAbortFlag();

    void setAgent(QScriptEngineAgent *agent);
    QScriptEngineAgent *agent() const;

    void agentDeleted(QScriptEngineAgent *agent);

    void installTranslatorFunctions(QScriptValueImpl &object);

#ifndef Q_SCRIPT_NO_EVENT_NOTIFY
    qint64 nextScriptId();
    inline bool shouldNotify() const;
    inline void notifyScriptLoad(qint64 id, const QString &program,
                                 const QString &fileName, int lineNumber);
    void notifyScriptLoad_helper(qint64 id, const QString &program,
                                 const QString &fileName, int lineNumber);
    inline void notifyScriptUnload(qint64 id);
    void notifyScriptUnload_helper(qint64 id);
    inline void notifyPositionChange(QScriptContextPrivate *ctx);
    void notifyPositionChange_helper(QScriptContextPrivate *ctx);
    inline void notifyContextPush();
    void notifyContextPush_helper();
    inline void notifyContextPop();
    void notifyContextPop_helper();
    inline void notifyFunctionEntry(QScriptContextPrivate *ctx);
    void notifyFunctionEntry_helper(QScriptContextPrivate *ctx);
    inline void notifyFunctionExit(QScriptContextPrivate *ctx);
    void notifyFunctionExit_helper(QScriptContextPrivate *ctx);
    inline void notifyException(QScriptContextPrivate *ctx);
    void notifyException_helper(QScriptContextPrivate *ctx);
    inline void notifyExceptionCatch(QScriptContextPrivate *ctx);
    void notifyExceptionCatch_helper(QScriptContextPrivate *ctx);
    void notifyDebugger(QScriptContextPrivate *ctx);
#endif // Q_SCRIPT_NO_EVENT_NOTIFY

public: // attributes
    bool m_evaluating;
    bool m_abort;
    int m_callDepth;
    int m_maxCallDepth;
    int m_gc_depth;
    QList<QScriptValueImpl> m_markStack;
    QScriptValueImpl m_globalObject;
    int m_oldStringRepositorySize;
    int m_oldTempStringRepositorySize;
    QVector<QScriptNameIdImpl*> m_stringRepository;
    int m_newAllocatedStringRepositoryChars;
    QVector<QScriptNameIdImpl*> m_tempStringRepository;
    int m_newAllocatedTempStringRepositoryChars;
    QScriptNameIdImpl **m_string_hash_base;
    int m_string_hash_size;
    QScript::GCAlloc<QScriptObject> objectAllocator;
    int m_objectGeneration;
    QScript::Repository<QScriptContext, QScriptContextPrivate> m_frameRepository;
    QScriptContextPrivate *m_context;
    QScriptValueImpl *tempStackBegin;
    QScriptValueImpl *tempStackEnd;
    QScript::AST::Node *m_abstractSyntaxTree;
    QScript::Lexer *m_lexer;
    QScript::MemoryPool *m_pool;
    QStringList m_exceptionBacktrace;
    qint64 m_scriptCounter;

    QScriptValueImpl m_undefinedValue;
    QScriptValueImpl m_nullValue;
    
    QScript::Ecma::Object *objectConstructor;
    QScript::Ecma::Number *numberConstructor;
    QScript::Ecma::Boolean *booleanConstructor;
    QScript::Ecma::String *stringConstructor;
    QScript::Ecma::Date *dateConstructor;
    QScript::Ecma::Function *functionConstructor;
    QScript::Ecma::Array *arrayConstructor;
    QScript::Ecma::RegExp *regexpConstructor;
    QScript::Ecma::Error *errorConstructor;
    QScript::Ext::Enumeration *enumerationConstructor;
    QScript::Ext::Variant *variantConstructor;
    QScript::ExtQObject *qobjectConstructor;
    QScript::ExtQMetaObject *qmetaObjectConstructor;

    QHash<int, QScriptCustomTypeInfo> m_customTypes;

    QScriptFunction *m_evalFunction;

    QList<QScriptClassInfo*> m_allocated_classes;
    QScriptClassInfo *m_class_object;
    QScriptClassInfo *m_class_function;
    QScriptClassInfo *m_class_with;
    QScriptClassInfo *m_class_arguments;
    QScriptClassInfo *m_class_activation;

    int m_class_prev_id;
    qint64 m_next_object_id;

    QScript::Repository<QScriptValuePrivate, QScriptValuePrivate> m_handleRepository;
    QHash<QScriptObject*, QScriptValuePrivate*> m_objectHandles;
    QHash<QScriptNameIdImpl*, QScriptValuePrivate*> m_stringHandles;
    QVector<QScriptValuePrivate*> m_otherHandles;

    QScript::Repository<QScriptStringPrivate,
                        QScriptStringPrivate> m_internedStringRepository;
    QHash<QScriptNameIdImpl*, QScriptStringPrivate*> m_internedStrings;

    QSet<QScriptObject*> visitedArrayElements;

#ifndef QT_NO_REGEXP
    QHash<QString, QRegExp> m_regExpLiterals;
#endif

    QScript::IdTable m_id_table;

    QSet<QString> m_importedExtensions;
    QSet<QString> m_extensionsBeingImported;

    int m_processEventsInterval;
    int m_nextProcessEvents;
    int m_processEventIncr;
    QTime m_processEventTracker;

    QList<QScriptEngineAgent*> m_agents;
    QScriptEngineAgent *m_agent;

#ifndef QT_NO_QOBJECT
    QList<QObject*> m_qobjectsToBeDeleted;
    QHash<QObject*, QScriptQObjectData*> m_qobjectData;

# ifndef Q_SCRIPT_NO_QMETAOBJECT_CACHE
    QHash<const QMetaObject*, QScriptMetaObject*> m_cachedMetaObjects;
# endif
#endif

#ifdef QT_NO_QOBJECT
    QScriptEngine *q_ptr;
#endif
};

QT_END_NAMESPACE

#endif // QT_NO_SCRIPT

#endif