Long live Qt 4.5!

1 files changed, 448 insertions, 0 deletions

diff --git a/src/script/qscriptvalueimpl.cpp b/src/script/qscriptvalueimpl.cpp
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+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the QtScript module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** 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, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, 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.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qscriptvalueimpl_p.h"
+
+#ifndef QT_NO_SCRIPT
+
+#include "qscriptengine_p.h"
+#include "qscriptvalueimpl_p.h"
+#include "qscriptcontext_p.h"
+#include "qscriptmember_p.h"
+#include "qscriptobject_p.h"
+
+QT_BEGIN_NAMESPACE
+
+static void dfs(QScriptObject *instance, QHash<QScriptObject*, int> &dfn, int n)
+{
+    bool found = dfn.contains(instance);
+    dfn[instance] = n;
+
+    if (found)
+        return;
+
+    if (instance->m_prototype.isObject())
+        dfs (instance->m_prototype.m_object_value, dfn, n + 1);
+
+    if (instance->m_scope.isObject())
+        dfs (instance->m_scope.m_object_value, dfn, n + 1);
+}
+
+
+static bool checkCycle(QScriptObject *instance, const QHash<QScriptObject*, int> &dfn)
+{
+    int n = dfn.value(instance);
+
+    if (instance->m_prototype.isObject()) {
+        if (n >= dfn.value(instance->m_prototype.m_object_value))
+            return true;
+    }
+
+    if (instance->m_scope.isObject()) {
+        if (n >= dfn.value(instance->m_scope.m_object_value))
+            return true;
+    }
+
+    return false;
+}
+
+bool QScriptValueImpl::detectedCycle() const
+{
+    QHash<QScriptObject*, int> dfn;
+    dfs(m_object_value, dfn, 0);
+    return checkCycle(m_object_value, dfn);
+}
+
+bool QScriptValueImpl::instanceOf(const QScriptValueImpl &value) const
+{
+    if (! isObject() || ! value.isObject() || !value.implementsHasInstance())
+        return false;
+    return value.hasInstance(*this);
+}
+
+bool QScriptValueImpl::implementsHasInstance() const
+{
+    Q_ASSERT(isObject());
+    if (isFunction())
+        return true;
+    if (QScriptClassData *odata = classInfo()->data()) {
+        return odata->implementsHasInstance(*this);
+    }
+    return false;
+}
+
+bool QScriptValueImpl::hasInstance(const QScriptValueImpl &value) const
+{
+    Q_ASSERT(isObject());
+
+    if (QScriptClassData *odata = classInfo()->data()) {
+        if (odata->implementsHasInstance(*this))
+            return odata->hasInstance(*this, value);
+    }
+    if (!isFunction())
+        return false;
+
+    // [[HasInstance] for function objects
+
+    if (!value.isObject())
+        return false;
+
+    QScriptEnginePrivate *eng = engine();
+    QScriptValueImpl proto = property(eng->idTable()->id_prototype);
+    if (!proto.isObject()) {
+        QScriptContextPrivate *ctx = eng->currentContext();
+        ctx->throwTypeError(QLatin1String("instanceof: 'prototype' property is not an object"));
+        return false;
+    }
+
+    QScriptObject *target = proto.m_object_value;
+    QScriptValueImpl v = value;
+    while (true) {
+        v = v.prototype();
+        if (!v.isObject())
+            break;
+        if (target == v.m_object_value)
+            return true;
+    }
+    return false;
+}
+
+bool QScriptValueImpl::resolve_helper(QScriptNameIdImpl *nameId, QScript::Member *member,
+                                      QScriptValueImpl *object, QScriptValue::ResolveFlags mode,
+                                      QScript::AccessMode access) const
+{
+    QScriptObject *object_data = m_object_value;
+
+    QScriptEnginePrivate *eng_p = engine();
+
+    if (nameId == eng_p->idTable()->id___proto__) {
+        member->native(nameId, /*id=*/0, QScriptValue::Undeletable);
+        *object = *this;
+        return true;
+    }
+
+    // If not found anywhere else, search in the extra members.
+    if (QScriptClassData *odata = classInfo()->data()) {
+        *object = *this;
+
+        if (odata->resolve(*this, nameId, member, object, access))
+            return true;
+    }
+
+    if (mode & QScriptValue::ResolvePrototype) {
+        // For values and other non object based types, search in class's prototype
+        const QScriptValueImpl &proto = object_data->m_prototype;
+
+        if (proto.isObject()
+            && proto.resolve(nameId, member, object, mode, access)) {
+            return true;
+        }
+    }
+
+    if ((mode & QScriptValue::ResolveScope) && object_data->m_scope.isValid())
+        return object_data->m_scope.resolve(nameId, member, object, mode, access);
+
+    return false;
+}
+
+void QScriptValueImpl::setProperty(QScriptNameIdImpl *nameId,
+                                   const QScriptValueImpl &value,
+                                   const QScriptValue::PropertyFlags &flags)
+{
+    if (!isObject())
+        return;
+
+    QScriptValueImpl base;
+    QScript::Member member;
+
+    QScriptValue::ResolveFlags mode = QScriptValue::ResolveLocal;
+    // if we are not setting a setter or getter, look in prototype too
+    if (!(flags & (QScriptValue::PropertyGetter | QScriptValue::PropertySetter)))
+        mode |= QScriptValue::ResolvePrototype;
+
+    if (resolve(nameId, &member, &base, mode, QScript::ReadWrite)) {
+        // we resolved an existing property with that name
+        if (flags & (QScriptValue::PropertyGetter | QScriptValue::PropertySetter)) {
+            // setting the getter or setter of a property in this object
+            if (member.isNativeProperty()) {
+                if (value.isValid()) {
+                    qWarning("QScriptValue::setProperty() failed: "
+                             "cannot set getter or setter of native property `%s'",
+                             qPrintable(nameId->s));
+                }
+                return;
+            }
+            if (member.isSetter()) {
+                // the property we resolved is a setter
+                if (!(flags & QScriptValue::PropertySetter) && !member.isGetter()) {
+                    // find the getter, if not, create one
+                    if (!m_object_value->findGetter(&member)) {
+                        if (!value.isValid())
+                            return; // don't create property for invalid value
+                        createMember(nameId, &member, flags);
+                    }
+                }
+            } else if (member.isGetter()) {
+                // the property we resolved is a getter
+                if (!(flags & QScriptValue::PropertyGetter)) {
+                    // find the setter, if not, create one
+                    if (!m_object_value->findSetter(&member)) {
+                        if (!value.isValid())
+                            return; // don't create property for invalid value
+                        createMember(nameId, &member, flags);
+                    }
+                }
+            } else {
+                // the property is a normal property -- change the flags
+                uint newFlags = flags & ~QScript::Member::InternalRange;
+                newFlags |= QScript::Member::ObjectProperty;
+                member.resetFlags(newFlags);
+                base.m_object_value->m_members[member.id()].resetFlags(newFlags);
+            }
+            Q_ASSERT(member.isValid());
+            if (!value.isValid()) {
+                // remove the property
+                removeMember(member);
+                return;
+            }
+        } else {
+            // setting the value
+            if (member.isGetterOrSetter()) {
+                // call the setter
+                QScriptValueImpl setter;
+                if (member.isObjectProperty() && !member.isSetter()) {
+                    if (!base.m_object_value->findSetter(&member)) {
+                        qWarning("QScriptValue::setProperty() failed: "
+                                 "property '%s' has a getter but no setter",
+                                 qPrintable(nameId->s));
+                        return;
+                    }
+                }
+                base.get(member, &setter);
+                setter.call(*this, QScriptValueImplList() << value);
+                return;
+            } else {
+                if (base.m_object_value != m_object_value) {
+                    if (!value.isValid())
+                        return; // don't create property for invalid value
+                    createMember(nameId, &member, flags);
+                    base = *this;
+                } else {
+                    if (!value.isValid()) {
+                        // remove the property
+                        removeMember(member);
+                        return;
+                    }
+                }
+                if (flags != QScriptValue::KeepExistingFlags) {
+                    // change flags
+                    if (member.isNativeProperty()) {
+                        qWarning("QScriptValue::setProperty(%s): "
+                                 "cannot change flags of a native property",
+                                 qPrintable(nameId->s));
+                    } else {
+                        uint newFlags = member.flags() & QScript::Member::InternalRange;
+                        newFlags |= flags & ~QScript::Member::InternalRange;
+                        base.m_object_value->m_members[member.id()].resetFlags(newFlags);
+                    }
+                }
+            }
+        }
+    } else {
+        // property does not exist
+        if (!value.isValid())
+            return; // don't create property for invalid value
+        createMember(nameId, &member, flags & ~QScript::Member::InternalRange);
+        base = *this;
+    }
+
+    base.put(member, value);
+}
+
+QVariant QScriptValueImpl::toVariant() const
+{
+    switch (m_type) {
+    case QScript::InvalidType:
+        return QVariant();
+
+    case QScript::UndefinedType:
+    case QScript::NullType:
+    case QScript::PointerType:
+    case QScript::ReferenceType:
+        break;
+
+    case QScript::BooleanType:
+        return QVariant(m_bool_value);
+
+    case QScript::IntegerType:
+        return QVariant(m_int_value);
+
+    case QScript::NumberType:
+        return QVariant(m_number_value);
+
+    case QScript::StringType:
+        return QVariant(m_string_value->s);
+
+    case QScript::LazyStringType:
+        return QVariant(*m_lazy_string_value);
+
+    case QScript::ObjectType:
+        if (isDate())
+            return QVariant(toDateTime());
+
+#ifndef QT_NO_REGEXP
+        if (isRegExp())
+            return QVariant(toRegExp());
+#endif
+        if (isVariant())
+            return variantValue();
+
+#ifndef QT_NO_QOBJECT
+        if (isQObject())        
+            return qVariantFromValue(toQObject());
+#endif
+
+        QScriptValueImpl v = engine()->toPrimitive(*this);
+        if (!v.isObject())
+            return v.toVariant();
+        break;
+    } // switch
+    return QVariant();
+}
+
+QDebug &operator<<(QDebug &d, const QScriptValueImpl &object)
+{
+    d.nospace() << "QScriptValue(";
+
+    switch (object.type()) {
+    case QScript::InvalidType:
+        d.nospace() << "Invalid)";
+        return d;
+
+    case QScript::BooleanType:
+        d.nospace() << "bool=" << object.toBoolean();
+        break;
+
+    case QScript::IntegerType:
+        d.nospace() << "int=" << object.toInt32();
+        break;
+
+    case QScript::NumberType:
+        d.nospace() << "qsreal=" << object.toNumber();
+        break;
+
+    case QScript::LazyStringType:
+    case QScript::StringType:
+        d.nospace() << "string=" << object.toString();
+        break;
+
+    case QScript::ReferenceType:
+        d.nospace() << "reference";
+        break;
+
+    case QScript::NullType:
+        d.nospace() << "null";
+        break;
+
+    case QScript::UndefinedType:
+        d.nospace() << "undefined";
+        break;
+
+    case QScript::PointerType:
+        d.nospace() << "pointer";
+        break;
+
+    case QScript::ObjectType:
+        d.nospace() << object.classInfo()->name() << ",{";
+        QScriptObject *od = object.objectValue();
+        for (int i=0; i<od->memberCount(); ++i) {
+            if (i != 0)
+                d << ",";
+
+            QScript::Member m;
+            od->member(i, &m);
+
+            if (m.isValid() && m.isObjectProperty()) {
+                d << object.engine()->toString(m.nameId());
+                QScriptValueImpl o;
+                od->get(m, &o);
+                d.nospace() << QLatin1String(":")
+                            << (o.classInfo()
+                                ? o.classInfo()->name()
+                                : QLatin1String("?"));
+            }
+        }
+
+        d.nospace() << "} scope={";
+        QScriptValueImpl scope = object.scope();
+        while (scope.isValid()) {
+            Q_ASSERT(scope.isObject());
+            d.nospace() << " " << scope.objectValue();
+            scope = scope.scope();
+        }
+        d.nospace() << "}";
+        break;
+    }
+
+    d << ")";
+    return d;
+}
+
+void QScriptValueImpl::destroyObjectData()
+{
+    Q_ASSERT(isObject());
+    m_object_value->finalizeData();
+}
+
+bool QScriptValueImpl::isMarked(int generation) const
+{
+    if (isString())
+        return (m_string_value->used != 0);
+    else if (isObject()) {
+        QScript::GCBlock *block = QScript::GCBlock::get(m_object_value);
+        return (block->generation == generation);
+    }
+    return false;
+}
+
+QT_END_NAMESPACE
+
+#endif // QT_NO_SCRIPT