/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtQml module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
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** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
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** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
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****************************************************************************/
#ifndef QV4SCRIPT_H
#define QV4SCRIPT_H

//
//  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.
//

#include "qv4global_p.h"
#include "qv4engine_p.h"
#include "qv4functionobject_p.h"
#include "qv4qmlcontext_p.h"

#include <QQmlError>

QT_BEGIN_NAMESPACE

class QQmlContextData;

namespace QQmlJS {
class Directives;
}

namespace QV4 {

struct ContextStateSaver {
    Value *savedContext;
    bool strictMode;
    Lookup *lookups;
    const QV4::Value *constantTable;
    CompiledData::CompilationUnitBase *compilationUnit;
    int lineNumber;

    ContextStateSaver(const Scope &scope, ExecutionContext *context)
        : savedContext(scope.alloc(1))
        , strictMode(context->d()->strictMode)
        , lookups(context->d()->lookups)
        , constantTable(context->d()->constantTable)
        , compilationUnit(context->d()->compilationUnit)
        , lineNumber(context->d()->lineNumber)
    {
        savedContext->setM(context->d());
    }
    ContextStateSaver(const Scope &scope, Heap::ExecutionContext *context)
        : savedContext(scope.alloc(1))
        , strictMode(context->strictMode)
        , lookups(context->lookups)
        , constantTable(context->constantTable)
        , compilationUnit(context->compilationUnit)
        , lineNumber(context->lineNumber)
    {
        savedContext->setM(context);
    }

    ~ContextStateSaver()
    {
        Heap::ExecutionContext *ctx = static_cast<Heap::ExecutionContext *>(savedContext->m());
        ctx->strictMode = strictMode;
        ctx->lookups = lookups;
        ctx->constantTable = constantTable;
        ctx->compilationUnit = compilationUnit;
        ctx->lineNumber = lineNumber;
    }
};

struct Q_QML_EXPORT Script {
    Script(ExecutionContext *scope, const QString &sourceCode, const QString &source = QString(), int line = 1, int column = 0)
        : sourceFile(source), line(line), column(column), sourceCode(sourceCode)
        , scope(scope), strictMode(false), inheritContext(false), parsed(false)
        , vmFunction(0), parseAsBinding(false) {}
    Script(ExecutionEngine *engine, QmlContext *qml, const QString &sourceCode, const QString &source = QString(), int line = 1, int column = 0)
        : sourceFile(source), line(line), column(column), sourceCode(sourceCode)
        , scope(engine->rootContext()), strictMode(false), inheritContext(true), parsed(false)
        , vmFunction(0), parseAsBinding(true) {
        if (qml)
            qmlContext.set(engine, *qml);
    }
    Script(ExecutionEngine *engine, QmlContext *qml, CompiledData::CompilationUnit *compilationUnit);
    ~Script();
    QString sourceFile;
    int line;
    int column;
    QString sourceCode;
    ExecutionContext *scope;
    bool strictMode;
    bool inheritContext;
    bool parsed;
    QV4::PersistentValue qmlContext;
    QQmlRefPointer<CompiledData::CompilationUnit> compilationUnit;
    Function *vmFunction;
    bool parseAsBinding;

    void parse();
    ReturnedValue run();

    Function *function();

    static QQmlRefPointer<CompiledData::CompilationUnit> precompile(
            IR::Module *module, Compiler::JSUnitGenerator *unitGenerator, ExecutionEngine *engine,
            const QString &fileName, const QString &finalUrl, const QString &source,
            QList<QQmlError> *reportedErrors = 0, QQmlJS::Directives *directivesCollector = 0);

    static ReturnedValue evaluate(ExecutionEngine *engine, const QString &script, QmlContext *qmlContext);
};

}

QT_END_NAMESPACE

#endif