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authorAlexis Menard <alexis.menard@nokia.com>2009-04-17 14:06:06 (GMT)
committerAlexis Menard <alexis.menard@nokia.com>2009-04-17 14:06:06 (GMT)
commitf15b8a83e2e51955776a3f07cb85ebfc342dd8ef (patch)
treec5dc684986051654898db11ce73e03b9fec8db99 /src/script/qscriptvalueimpl.cpp
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Initial import of statemachine branch from the old kinetic repository
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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