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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
#include "qmljsscopebuilder.h"
#include "qmljsbind.h"
#include "qmljsevaluate.h"
#include "qmljsscopechain.h"
#include "qmljsutils.h"
#include "parser/qmljsast_p.h"
#include <utils/qtcassert.h>
using namespace QmlJS;
using namespace QmlJS::AST;
ScopeBuilder::ScopeBuilder(ScopeChain *scopeChain)
: _scopeChain(scopeChain)
{
}
ScopeBuilder::~ScopeBuilder()
{
}
void ScopeBuilder::push(AST::Node *node)
{
_nodes += node;
// QML scope object
Node *qmlObject = cast<UiObjectDefinition *>(node);
if (! qmlObject)
qmlObject = cast<UiObjectBinding *>(node);
if (qmlObject) {
// save the previous scope objects
_qmlScopeObjects.push(_scopeChain->qmlScopeObjects());
setQmlScopeObject(qmlObject);
}
// JS signal handler scope
if (UiScriptBinding *script = cast<UiScriptBinding *>(node)) {
QString name;
if (script->qualifiedId) {
name = script->qualifiedId->name.toString();
if (!_scopeChain->qmlScopeObjects().isEmpty()
&& name.startsWith(QLatin1String("on"))
&& !script->qualifiedId->next) {
const ObjectValue *owner = nullptr;
const Value *value = nullptr;
// try to find the name on the scope objects
for (const ObjectValue *scope : _scopeChain->qmlScopeObjects()) {
value = scope->lookupMember(name, _scopeChain->context(), &owner);
if (value)
break;
}
// signals defined in QML
if (const ASTSignal *astsig = value_cast<ASTSignal>(value)) {
_scopeChain->appendJsScope(astsig->bodyScope());
// signals defined in C++
} else if (const CppComponentValue *qmlObject = value_cast<CppComponentValue>(owner)) {
if (const ObjectValue *scope = qmlObject->signalScope(name))
_scopeChain->appendJsScope(scope);
}
}
}
}
// JS scopes
switch (node->kind) {
case Node::Kind_UiScriptBinding:
case Node::Kind_FunctionDeclaration:
case Node::Kind_FunctionExpression:
case Node::Kind_UiPublicMember:
{
ObjectValue *scope = _scopeChain->document()->bind()->findAttachedJSScope(node);
if (scope)
_scopeChain->appendJsScope(scope);
break;
}
default:
break;
}
}
void ScopeBuilder::push(const QList<AST::Node *> &nodes)
{
for (Node *node : nodes)
push(node);
}
void ScopeBuilder::pop()
{
Node *toRemove = _nodes.last();
_nodes.removeLast();
// JS scopes
switch (toRemove->kind) {
case Node::Kind_UiScriptBinding:
case Node::Kind_FunctionDeclaration:
case Node::Kind_FunctionExpression:
case Node::Kind_UiPublicMember:
{
ObjectValue *scope = _scopeChain->document()->bind()->findAttachedJSScope(toRemove);
if (scope) {
QList<const ObjectValue *> jsScopes = _scopeChain->jsScopes();
if (!jsScopes.isEmpty()) {
jsScopes.removeLast();
_scopeChain->setJsScopes(jsScopes);
}
}
break;
}
default:
break;
}
// QML scope object
if (cast<UiObjectDefinition *>(toRemove) || cast<UiObjectBinding *>(toRemove)) {
// restore the previous scope objects
QTC_ASSERT(!_qmlScopeObjects.isEmpty(), return);
_scopeChain->setQmlScopeObjects(_qmlScopeObjects.pop());
}
}
void ScopeBuilder::setQmlScopeObject(Node *node)
{
QList<const ObjectValue *> qmlScopeObjects;
if (_scopeChain->document()->bind()->isGroupedPropertyBinding(node)) {
UiObjectDefinition *definition = cast<UiObjectDefinition *>(node);
if (!definition)
return;
const Value *v = scopeObjectLookup(definition->qualifiedTypeNameId);
if (!v)
return;
const ObjectValue *object = v->asObjectValue();
if (!object)
return;
qmlScopeObjects += object;
_scopeChain->setQmlScopeObjects(qmlScopeObjects);
return;
}
const ObjectValue *scopeObject = _scopeChain->document()->bind()->findQmlObject(node);
if (scopeObject)
qmlScopeObjects += scopeObject;
else
return; // Probably syntax errors, where we're working with a "recovered" AST.
// check if the object has a Qt.ListElement or Qt.Connections ancestor
// ### allow only signal bindings for Connections
PrototypeIterator iter(scopeObject, _scopeChain->context());
iter.next();
while (iter.hasNext()) {
const ObjectValue *prototype = iter.next();
if (const CppComponentValue *qmlMetaObject = value_cast<CppComponentValue>(prototype)) {
if ((qmlMetaObject->className() == "ListElement"
|| qmlMetaObject->className() == "Connections")
&& (qmlMetaObject->moduleName() == "Qt" || qmlMetaObject->moduleName() == "QtQml"
|| qmlMetaObject->moduleName() == "QtQml.Base"
|| qmlMetaObject->moduleName() == "QtQuick")) {
qmlScopeObjects.clear();
break;
}
}
}
// check if the object has a Qt.PropertyChanges ancestor
const ObjectValue *prototype = scopeObject->prototype(_scopeChain->context());
prototype = isPropertyChangesObject(_scopeChain->context(), prototype);
// find the target script binding
if (prototype) {
UiObjectInitializer *initializer = initializerOfObject(node);
if (initializer) {
for (UiObjectMemberList *m = initializer->members; m; m = m->next) {
if (UiScriptBinding *scriptBinding = cast<UiScriptBinding *>(m->member)) {
if (scriptBinding->qualifiedId
&& scriptBinding->qualifiedId->name == QLatin1String("target")
&& ! scriptBinding->qualifiedId->next) {
Evaluate evaluator(_scopeChain);
const Value *targetValue = evaluator(scriptBinding->statement);
if (const ObjectValue *target = value_cast<ObjectValue>(targetValue))
qmlScopeObjects.prepend(target);
else
qmlScopeObjects.clear();
}
}
}
}
}
_scopeChain->setQmlScopeObjects(qmlScopeObjects);
}
const Value *ScopeBuilder::scopeObjectLookup(AST::UiQualifiedId *id)
{
// do a name lookup on the scope objects
const Value *result = nullptr;
for (const ObjectValue *scopeObject : _scopeChain->qmlScopeObjects()) {
const ObjectValue *object = scopeObject;
for (UiQualifiedId *it = id; it; it = it->next) {
if (it->name.isEmpty())
return nullptr;
result = object->lookupMember(it->name.toString(), _scopeChain->context());
if (!result)
break;
if (it->next) {
object = result->asObjectValue();
if (!object) {
result = nullptr;
break;
}
}
}
if (result)
break;
}
return result;
}
const ObjectValue *ScopeBuilder::isPropertyChangesObject(const ContextPtr &context,
const ObjectValue *object)
{
PrototypeIterator iter(object, context);
while (iter.hasNext()) {
const ObjectValue *prototype = iter.next();
if (const CppComponentValue *qmlMetaObject = value_cast<CppComponentValue>(prototype)) {
if (qmlMetaObject->className() == QLatin1String("PropertyChanges")
&& (qmlMetaObject->moduleName() == QLatin1String("Qt")
|| qmlMetaObject->moduleName() == QLatin1String("QtQuick")))
return prototype;
}
}
return nullptr;
}
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