qt_runtime.cpp

linux下开源浏览器WebKit的源码,市面上的很多商用浏览器都是移植自WebKit

/*
 * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License as published by the Free Software Foundation; either
 *  version 2 of the License, or (at your option) any later version.
 *
 *  This library is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 */

#include "config.h"
#include "qt_runtime.h"

#include "DateInstance.h"
#include "DateMath.h"
#include "DatePrototype.h"
#include "FunctionPrototype.h"
#include "Interpreter.h"
#include "JSArray.h"
#include "JSByteArray.h"
#include "JSDOMBinding.h"
#include "JSGlobalObject.h"
#include "JSLock.h"
#include "JSObject.h"
#include "ObjectPrototype.h"
#include "PropertyNameArray.h"
#include "RegExpConstructor.h"
#include "RegExpObject.h"
#include "qdatetime.h"
#include "qdebug.h"
#include "qmetaobject.h"
#include "qmetatype.h"
#include "qobject.h"
#include "qstringlist.h"
#include "qt_instance.h"
#include "qvarlengtharray.h"
#include <JSFunction.h>
#include <limits.h>
#include <runtime.h>
#include <runtime_array.h>
#include <runtime_object.h>
#include "BooleanObject.h"

// QtScript has these
Q_DECLARE_METATYPE(QObjectList);
Q_DECLARE_METATYPE(QList<int>);
Q_DECLARE_METATYPE(QVariant);

using namespace WebCore;

namespace JSC {
namespace Bindings {

// Debugging
//#define QTWK_RUNTIME_CONVERSION_DEBUG
//#define QTWK_RUNTIME_MATCH_DEBUG

class QWKNoDebug
{
public:
    inline QWKNoDebug(){}
    inline ~QWKNoDebug(){}

    template<typename T>
    inline QWKNoDebug &operator<<(const T &) { return *this; }
};

#ifdef QTWK_RUNTIME_CONVERSION_DEBUG
#define qConvDebug() qDebug()
#else
#define qConvDebug() QWKNoDebug()
#endif

#ifdef QTWK_RUNTIME_MATCH_DEBUG
#define qMatchDebug() qDebug()
#else
#define qMatchDebug() QWKNoDebug()
#endif

typedef enum {
    Variant = 0,
    Number,
    Boolean,
    String,
    Date,
    RegExp,
    Array,
    QObj,
    Object,
    Null,
    RTArray,
    JSByteArray
} JSRealType;

#if defined(QTWK_RUNTIME_CONVERSION_DEBUG) || defined(QTWK_RUNTIME_MATCH_DEBUG)
QDebug operator<<(QDebug dbg, const JSRealType &c)
{
     const char *map[] = { "Variant", "Number", "Boolean", "String", "Date",
         "RegExp", "Array", "RTObject", "Object", "Null", "RTArray"};

     dbg.nospace() << "JSType(" << ((int)c) << ", " <<  map[c] << ")";

     return dbg.space();
}
#endif

static JSRealType valueRealType(ExecState* exec, JSValuePtr val)
{
    if (val.isNumber())
        return Number;
    else if (val.isString())
        return String;
    else if (val.isBoolean())
        return Boolean;
    else if (val.isNull())
        return Null;
    else if (isJSByteArray(&exec->globalData(), val))
        return JSByteArray;
    else if (val.isObject()) {
        JSObject *object = val.toObject(exec);
        if (object->inherits(&RuntimeArray::s_info))  // RuntimeArray 'inherits' from Array, but not in C++
            return RTArray;
        else if (object->inherits(&JSArray::info))
            return Array;
        else if (object->inherits(&DateInstance::info))
            return Date;
        else if (object->inherits(&RegExpObject::info))
            return RegExp;
        else if (object->inherits(&RuntimeObjectImp::s_info))
            return QObj;
        return Object;
    }

    return String; // I don't know.
}

QVariant convertValueToQVariant(ExecState* exec, JSValuePtr value, QMetaType::Type hint, int *distance, HashSet<JSObject*>* visitedObjects)
{
    JSObject* object = 0;
    if (value.isObject()) {
        object = value.toObject(exec);
        if (visitedObjects->contains(object))
            return QVariant();

        visitedObjects->add(object);
    }

    // check magic pointer values before dereferencing value
    if (value == jsNaN(exec)
        || (value == jsUndefined()
            && hint != QMetaType::QString
            && hint != (QMetaType::Type) qMetaTypeId<QVariant>())) {
        if (distance)
            *distance = -1;
        return QVariant();
    }

    JSLock lock(false);
    JSRealType type = valueRealType(exec, value);
    if (hint == QMetaType::Void) {
        switch(type) {
            case Number:
                hint = QMetaType::Double;
                break;
            case Boolean:
                hint = QMetaType::Bool;
                break;
            case String:
            default:
                hint = QMetaType::QString;
                break;
            case Date:
                hint = QMetaType::QDateTime;
                break;
            case RegExp:
                hint = QMetaType::QRegExp;
                break;
            case Object:
                if (object->inherits(&NumberObject::info))
                    hint = QMetaType::Double;
                else if (object->inherits(&BooleanObject::info))
                    hint = QMetaType::Bool;
                else
                    hint = QMetaType::QVariantMap;
                break;
            case QObj:
                hint = QMetaType::QObjectStar;
                break;
            case JSByteArray:
                hint = QMetaType::QByteArray;
                break;
            case Array:
            case RTArray:
                hint = QMetaType::QVariantList;
                break;
        }
    }

    qConvDebug() << "convertValueToQVariant: jstype is " << type << ", hint is" << hint;

    if (value == jsNull()
        && hint != QMetaType::QObjectStar
        && hint != QMetaType::VoidStar
        && hint != QMetaType::QString
        && hint != (QMetaType::Type) qMetaTypeId<QVariant>()) {
        if (distance)
            *distance = -1;
        return QVariant();
    }

    QVariant ret;
    int dist = -1;
    switch (hint) {
        case QMetaType::Bool:
            if (type == Object && object->inherits(&BooleanObject::info))
                ret = QVariant(asBooleanObject(value)->internalValue().toBoolean(exec));
            else
                ret = QVariant(value.toBoolean(exec));
            if (type == Boolean)
                dist = 0;
            else
                dist = 10;
            break;

        case QMetaType::Int:
        case QMetaType::UInt:
        case QMetaType::Long:
        case QMetaType::ULong:
        case QMetaType::LongLong:
        case QMetaType::ULongLong:
        case QMetaType::Short:
        case QMetaType::UShort:
        case QMetaType::Float:
        case QMetaType::Double:
            ret = QVariant(value.toNumber(exec));
            ret.convert((QVariant::Type)hint);
            if (type == Number) {
                switch (hint) {
                case QMetaType::Double:
                    dist = 0;
                    break;
                case QMetaType::Float:
                    dist = 1;
                    break;
                case QMetaType::LongLong:
                case QMetaType::ULongLong:
                    dist = 2;
                    break;
                case QMetaType::Long:
                case QMetaType::ULong:
                    dist = 3;
                    break;
                case QMetaType::Int:
                case QMetaType::UInt:
                    dist = 4;
                    break;
                case QMetaType::Short:
                case QMetaType::UShort:
                    dist = 5;
                    break;
                    break;
                default:
                    dist = 10;
                    break;
                }
            } else {
                dist = 10;
            }
            break;

        case QMetaType::QChar:
            if (type == Number || type == Boolean) {
                ret = QVariant(QChar((ushort)value.toNumber(exec)));
                if (type == Boolean)
                    dist = 3;
                else
                    dist = 6;
            } else {
                UString str = value.toString(exec);
                ret = QVariant(QChar(str.size() ? *(const ushort*)str.rep()->data() : 0));
                if (type == String)
                    dist = 3;
                else
                    dist = 10;
            }
            break;

        case QMetaType::QString: {
            if (value.isUndefinedOrNull()) {
                if (distance)
                    *distance = 1;
                return QString();
            } else {
                UString ustring = value.toString(exec);
                ret = QVariant(QString::fromUtf16((const ushort*)ustring.rep()->data(),ustring.size()));
                if (type == String)
                    dist = 0;
                else
                    dist = 10;
            }
            break;
        }

        case QMetaType::QVariantMap: 
            if (type == Object || type == Array || type == RTArray) {
                // Enumerate the contents of the object
                PropertyNameArray properties(exec);
                object->getPropertyNames(exec, properties);
                PropertyNameArray::const_iterator it = properties.begin();

                QVariantMap result;
                int objdist = 0;
                while(it != properties.end()) {
                    if (object->propertyIsEnumerable(exec, *it)) {
                        JSValuePtr val = object->get(exec, *it);
                        QVariant v = convertValueToQVariant(exec, val, QMetaType::Void, &objdist, visitedObjects);
                        if (objdist >= 0) {
                            UString ustring = (*it).ustring();
                            QString id = QString::fromUtf16((const ushort*)ustring.rep()->data(),ustring.size());
                            result.insert(id, v);
                        }
                    }
                    ++it;
                }
                dist = 1;
                ret = QVariant(result);
            }
            break;

        case QMetaType::QVariantList:
            if (type == RTArray) {
                RuntimeArray* rtarray = static_cast<RuntimeArray*>(object);

                QVariantList result;
                int len = rtarray->getLength();
                int objdist = 0;
                qConvDebug() << "converting a " << len << " length Array";
                for (int i = 0; i < len; ++i) {
                    JSValuePtr val = rtarray->getConcreteArray()->valueAt(exec, i);
                    result.append(convertValueToQVariant(exec, val, QMetaType::Void, &objdist, visitedObjects));
                    if (objdist == -1) {
                        qConvDebug() << "Failed converting element at index " << i;