path: root/src/qmlcompiler/qqmljsscope_p.h

// Copyright (C) 2019 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0

#ifndef QQMLJSSCOPE_P_H
#define QQMLJSSCOPE_P_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 <private/qtqmlcompilerexports_p.h>

#include "qqmljsmetatypes_p.h"
#include "qdeferredpointer_p.h"
#include "qqmljsannotation_p.h"

#include <QtQml/private/qqmljssourcelocation_p.h>

#include <QtCore/qfileinfo.h>
#include <QtCore/qhash.h>
#include <QtCore/qset.h>
#include <QtCore/qstring.h>
#include <QtCore/qversionnumber.h>

#include <optional>

QT_BEGIN_NAMESPACE

class QQmlJSImporter;

class Q_QMLCOMPILER_PRIVATE_EXPORT QQmlJSScope
{
public:
    QQmlJSScope(QQmlJSScope &&) = default;
    QQmlJSScope &operator=(QQmlJSScope &&) = default;

    using Ptr = QDeferredSharedPointer<QQmlJSScope>;
    using WeakPtr = QDeferredWeakPointer<QQmlJSScope>;
    using ConstPtr = QDeferredSharedPointer<const QQmlJSScope>;
    using WeakConstPtr = QDeferredWeakPointer<const QQmlJSScope>;

    using InlineComponentNameType = QString;
    using RootDocumentNameType = std::monostate; // an empty type that has std::hash
    /*!
     *  A Hashable type to differentiate document roots from different inline components.
     */
    using InlineComponentOrDocumentRootName =
            std::variant<InlineComponentNameType, RootDocumentNameType>;

    enum ScopeType
    {
        JSFunctionScope,
        JSLexicalScope,
        QMLScope,
        GroupedPropertyScope,
        AttachedPropertyScope,
        EnumScope
    };

    enum class AccessSemantics {
        Reference,
        Value,
        None,
        Sequence
    };

    enum Flag {
        Creatable = 0x1,
        Composite = 0x2,
        Singleton = 0x4,
        Script = 0x8,
        CustomParser = 0x10,
        Array = 0x20,
        InlineComponent = 0x40,
        WrappedInImplicitComponent = 0x80,
        HasBaseTypeError = 0x100,
        HasExtensionNamespace = 0x200,
        IsListProperty = 0x400,
    };
    Q_DECLARE_FLAGS(Flags, Flag)
    Q_FLAGS(Flags);

    class ConstPtrWrapperIterator
    {
    public:
        using iterator_category = std::forward_iterator_tag;
        using difference_type = std::ptrdiff_t;
        using value_type = ConstPtr;
        using pointer = value_type *;
        using reference = value_type &;

        ConstPtrWrapperIterator(QList<QQmlJSScope::Ptr>::const_iterator iterator)
            : m_iterator(iterator)
        {
        }

        friend bool operator==(const ConstPtrWrapperIterator &a, const ConstPtrWrapperIterator &b)
        {
            return a.m_iterator == b.m_iterator;
        }
        friend bool operator!=(const ConstPtrWrapperIterator &a, const ConstPtrWrapperIterator &b)
        {
            return a.m_iterator != b.m_iterator;
        }

        reference operator*()
        {
            if (!m_pointer)
                m_pointer = *m_iterator;
            return m_pointer;
        }
        pointer operator->()
        {
            if (!m_pointer)
                m_pointer = *m_iterator;
            return &m_pointer;
        }

        ConstPtrWrapperIterator &operator++()
        {
            m_iterator++;
            m_pointer = {};
            return *this;
        }
        ConstPtrWrapperIterator operator++(int)
        {
            auto before = *this;
            ++(*this);
            return before;
        }

    private:
        QList<QQmlJSScope::Ptr>::const_iterator m_iterator;
        QQmlJSScope::ConstPtr m_pointer;
    };

    class Import
    {
    public:
        Import() = default;
        Import(QString prefix, QString name, QTypeRevision version, bool isFile, bool isDependency);

        bool isValid() const;

        QString prefix() const { return m_prefix; }
        QString name() const { return m_name; }
        QTypeRevision version() const { return m_version; }
        bool isFile() const { return m_isFile; }
        bool isDependency() const { return m_isDependency; }

    private:
        QString m_prefix;
        QString m_name;
        QTypeRevision m_version;
        bool m_isFile = false;
        bool m_isDependency = false;

        friend inline size_t qHash(const Import &key, size_t seed = 0) noexcept
        {
            return qHashMulti(seed, key.m_prefix, key.m_name, key.m_version,
                              key.m_isFile, key.m_isDependency);
        }

        friend inline bool operator==(const Import &a, const Import &b)
        {
            return a.m_prefix == b.m_prefix && a.m_name == b.m_name && a.m_version == b.m_version
                    && a.m_isFile == b.m_isFile && a.m_isDependency == b.m_isDependency;
        }
    };

    class Export {
    public:
        Export() = default;
        Export(QString package, QString type, QTypeRevision version, QTypeRevision revision);

        bool isValid() const;

        QString package() const { return m_package; }
        QString type() const { return m_type; }
        QTypeRevision version() const { return m_version; }
        QTypeRevision revision() const { return m_revision; }

    private:
        QString m_package;
        QString m_type;
        QTypeRevision m_version;
        QTypeRevision m_revision;
    };

    template<typename Pointer>
    struct ExportedScope {
        Pointer scope;
        QList<QQmlJSScope::Export> exports;
    };

    template<typename Pointer>
    struct ImportedScope {
        Pointer scope;
        QTypeRevision revision;
    };

    /*! \internal
     *  Maps type names to types and the compile context of the types. The context can be
     *  INTERNAl (for c++ and synthetic jsrootgen types) or QML (for qml types).
     */
    struct ContextualTypes
    {
        enum CompileContext { INTERNAL, QML };

        ContextualTypes(
                CompileContext context,
                const QHash<QString, ImportedScope<ConstPtr>> types,
                const QQmlJSScope::ConstPtr &intType,
                const QQmlJSScope::ConstPtr &arrayType)
            : m_types(types)
            , m_context(context)
            , m_intType(intType)
            , m_arrayType(arrayType)
        {}

        CompileContext context() const { return m_context; }
        ConstPtr intType() const { return m_intType; }
        ConstPtr arrayType() const { return m_arrayType; }

        bool hasType(const QString &name) const { return m_types.contains(name); }
        ImportedScope<ConstPtr> type(const QString &name) const { return m_types[name]; }
        void setType(const QString &name, const ImportedScope<ConstPtr> &type)
        {
            m_types.insert(name, type);
        }
        void clearType(const QString &name)
        {
            m_types[name].scope = QQmlJSScope::ConstPtr();
        }

        bool isNullType(const QString &name) const
        {
            const auto it = m_types.constFind(name);
            return it != m_types.constEnd() && it->scope.isNull();
        }

        void addTypes(ContextualTypes &&types)
        {
            Q_ASSERT(types.m_context == m_context);
            m_types.insert(std::move(types.m_types));
        }

        void addTypes(const ContextualTypes &types)
        {
            Q_ASSERT(types.m_context == m_context);
            m_types.insert(types.m_types);
        }

        const QHash<QString, ImportedScope<ConstPtr>> &types() const { return m_types; }

        void clearTypes() { m_types.clear(); }

    private:
        QHash<QString, ImportedScope<ConstPtr>> m_types;
        CompileContext m_context;

        // For resolving enums
        QQmlJSScope::ConstPtr m_intType;

        // For resolving sequence types
        QQmlJSScope::ConstPtr m_arrayType;
    };

    struct JavaScriptIdentifier
    {
        enum Kind {
            Parameter,
            FunctionScoped,
            LexicalScoped,
            Injected
        };

        Kind kind = FunctionScoped;
        QQmlJS::SourceLocation location;
        bool isConst;
    };

    enum BindingTargetSpecifier {
        SimplePropertyTarget, // e.g. `property int p: 42`
        ListPropertyTarget, // e.g. `property list<Item> pList: [ Text {} ]`
        UnnamedPropertyTarget // default property bindings, where property name is unspecified
    };

    static QQmlJSScope::Ptr create() { return QSharedPointer<QQmlJSScope>(new QQmlJSScope); }
    static QQmlJSScope::Ptr clone(const QQmlJSScope::ConstPtr &origin);
    static QQmlJSScope::ConstPtr findCurrentQMLScope(const QQmlJSScope::ConstPtr &scope);

    QQmlJSScope::Ptr parentScope()
    {
        return m_parentScope.toStrongRef();
    }

    QQmlJSScope::ConstPtr parentScope() const
    {
QT_WARNING_PUSH
#if defined(Q_CC_GNU_ONLY) && Q_CC_GNU < 1400 && Q_CC_GNU >= 1200
    QT_WARNING_DISABLE_GCC("-Wuse-after-free")
#endif
        return QQmlJSScope::WeakConstPtr(m_parentScope).toStrongRef();
QT_WARNING_POP
    }

    static void reparent(const QQmlJSScope::Ptr &parentScope, const QQmlJSScope::Ptr &childScope);

    void insertJSIdentifier(const QString &name, const JavaScriptIdentifier &identifier);

    // inserts property as qml identifier as well as the corresponding
    void insertPropertyIdentifier(const QQmlJSMetaProperty &prop);

    bool isIdInCurrentScope(const QString &id) const;

    ScopeType scopeType() const { return m_scopeType; }
    void setScopeType(ScopeType type) { m_scopeType = type; }

    void addOwnMethod(const QQmlJSMetaMethod &method) { m_methods.insert(method.methodName(), method); }
    QMultiHash<QString, QQmlJSMetaMethod> ownMethods() const { return m_methods; }
    QList<QQmlJSMetaMethod> ownMethods(const QString &name) const { return m_methods.values(name); }
    bool hasOwnMethod(const QString &name) const { return m_methods.contains(name); }

    bool hasMethod(const QString &name) const;
    QHash<QString, QQmlJSMetaMethod> methods() const;
    QList<QQmlJSMetaMethod> methods(const QString &name) const;
    QList<QQmlJSMetaMethod> methods(const QString &name, QQmlJSMetaMethod::Type type) const;

    void addOwnEnumeration(const QQmlJSMetaEnum &enumeration) { m_enumerations.insert(enumeration.name(), enumeration); }
    QHash<QString, QQmlJSMetaEnum> ownEnumerations() const { return m_enumerations; }
    QQmlJSMetaEnum ownEnumeration(const QString &name) const { return m_enumerations.value(name); }
    bool hasOwnEnumeration(const QString &name) const { return m_enumerations.contains(name); }

    bool hasEnumeration(const QString &name) const;
    bool hasEnumerationKey(const QString &name) const;
    QQmlJSMetaEnum enumeration(const QString &name) const;
    QHash<QString, QQmlJSMetaEnum> enumerations() const;

    void setAnnotations(const QList<QQmlJSAnnotation> &annotation) { m_annotations = std::move(annotation); }
    const QList<QQmlJSAnnotation> &annotations() const { return m_annotations; }

    QString filePath() const { return m_filePath; }
    void setFilePath(const QString &file) { m_filePath = file; }

    // The name the type uses to refer to itself. Either C++ class name or base name of
    // QML file. isComposite tells us if this is a C++ or a QML name.
    QString internalName() const { return m_internalName; }
    void setInternalName(const QString &internalName) { m_internalName = internalName; }
    QString augmentedInternalName() const
    {
        using namespace Qt::StringLiterals;

        switch (m_semantics) {
        case AccessSemantics::Reference:
            return m_internalName + " *"_L1;
        case AccessSemantics::Value:
        case AccessSemantics::Sequence:
            break;
        case AccessSemantics::None:
            // If we got a namespace, it might still be a regular type, exposed as namespace.
            // We may need to travel the inheritance chain all the way up to QObject to
            // figure this out, since all other types may be exposed the same way.
            for (QQmlJSScope::ConstPtr base = baseType(); base; base = base->baseType()) {
                switch (base->accessSemantics()) {
                case AccessSemantics::Reference:
                    return m_internalName + " *"_L1;
                case AccessSemantics::Value:
                case AccessSemantics::Sequence:
                    return m_internalName;
                case AccessSemantics::None:
                    break;
                }
            }
            break;
        }
        return m_internalName;
    }

    // This returns a more user readable version of internalName / baseTypeName
    static QString prettyName(QAnyStringView name);

    static bool causesImplicitComponentWrapping(const QQmlJSMetaProperty &property,
                                                const QQmlJSScope::ConstPtr &assignedType);
    bool isComponentRootElement() const;

    void setInterfaceNames(const QStringList& interfaces) { m_interfaceNames = interfaces; }
    QStringList interfaceNames() const { return m_interfaceNames; }

    bool hasInterface(const QString &name) const;
    bool hasOwnInterface(const QString &name) const { return m_interfaceNames.contains(name); }

    void setOwnDeferredNames(const QStringList &names) { m_ownDeferredNames = names; }
    QStringList ownDeferredNames() const { return m_ownDeferredNames; }
    void setOwnImmediateNames(const QStringList &names) { m_ownImmediateNames = names; }
    QStringList ownImmediateNames() const { return m_ownImmediateNames; }

    bool isNameDeferred(const QString &name) const;

    // If isComposite(), this is the QML/JS name of the prototype. Otherwise it's the
    // relevant base class (in the hierarchy starting from QObject) of a C++ type.
    void setBaseTypeName(const QString &baseTypeName);
    QString baseTypeName() const;

    QQmlJSScope::ConstPtr baseType() const { return m_baseType.scope; }
    QTypeRevision baseTypeRevision() const { return m_baseType.revision; }

    QString qualifiedName() const { return m_qualifiedName; }
    void setQualifiedName(const QString &qualifiedName) { m_qualifiedName = qualifiedName; };
    static QString qualifiedNameFrom(const QString &moduleName, const QString &typeName,
                                     const QTypeRevision &firstRevision,
                                     const QTypeRevision &lastRevision);
    QString moduleName() const { return m_moduleName; }
    void setModuleName(const QString &moduleName) { m_moduleName = moduleName; }

    void clearBaseType() { m_baseType = {}; }
    void setBaseTypeError(const QString &baseTypeError);
    QString baseTypeError() const;

    void addOwnProperty(const QQmlJSMetaProperty &prop) { m_properties.insert(prop.propertyName(), prop); }
    QHash<QString, QQmlJSMetaProperty> ownProperties() const { return m_properties; }
    QQmlJSMetaProperty ownProperty(const QString &name) const { return m_properties.value(name); }
    bool hasOwnProperty(const QString &name) const { return m_properties.contains(name); }

    bool hasProperty(const QString &name) const;
    QQmlJSMetaProperty property(const QString &name) const;
    QHash<QString, QQmlJSMetaProperty> properties() const;

    void setPropertyLocallyRequired(const QString &name, bool isRequired);
    bool isPropertyRequired(const QString &name) const;
    bool isPropertyLocallyRequired(const QString &name) const;

    void addOwnPropertyBinding(
            const QQmlJSMetaPropertyBinding &binding,
            BindingTargetSpecifier specifier = BindingTargetSpecifier::SimplePropertyTarget)
    {
        Q_ASSERT(binding.sourceLocation().isValid());
        m_propertyBindings.insert(binding.propertyName(), binding);

        // NB: insert() prepends \a binding to the list of bindings, but we need
        // append, so rotate
        using iter = typename QMultiHash<QString, QQmlJSMetaPropertyBinding>::iterator;
        QPair<iter, iter> r = m_propertyBindings.equal_range(binding.propertyName());
        std::rotate(r.first, std::next(r.first), r.second);

        // additionally store bindings in the QmlIR compatible order
        addOwnPropertyBindingInQmlIROrder(binding, specifier);
        Q_ASSERT(m_propertyBindings.size() == m_propertyBindingsArray.size());
    }
    QMultiHash<QString, QQmlJSMetaPropertyBinding> ownPropertyBindings() const
    {
        return m_propertyBindings;
    }
    QPair<QMultiHash<QString, QQmlJSMetaPropertyBinding>::const_iterator,
          QMultiHash<QString, QQmlJSMetaPropertyBinding>::const_iterator>
    ownPropertyBindings(const QString &name) const
    {
        return m_propertyBindings.equal_range(name);
    }
    QList<QQmlJSMetaPropertyBinding> ownPropertyBindingsInQmlIROrder() const;
    bool hasOwnPropertyBindings(const QString &name) const
    {
        return m_propertyBindings.contains(name);
    }

    bool hasPropertyBindings(const QString &name) const;
    QList<QQmlJSMetaPropertyBinding> propertyBindings(const QString &name) const;

    struct AnnotatedScope; // defined later
    static AnnotatedScope ownerOfProperty(const QQmlJSScope::ConstPtr &self, const QString &name);

    bool isResolved() const;
    bool isFullyResolved() const;

    QString ownDefaultPropertyName() const { return m_defaultPropertyName; }
    void setOwnDefaultPropertyName(const QString &name) { m_defaultPropertyName = name; }
    QString defaultPropertyName() const;

    QString ownParentPropertyName() const { return m_parentPropertyName; }
    void setOwnParentPropertyName(const QString &name) { m_parentPropertyName = name; }
    QString parentPropertyName() const;

    QString ownAttachedTypeName() const { return m_attachedTypeName; }
    void setOwnAttachedTypeName(const QString &name) { m_attachedTypeName = name; }
    QQmlJSScope::ConstPtr ownAttachedType() const { return m_attachedType; }

    QString attachedTypeName() const;
    QQmlJSScope::ConstPtr attachedType() const;

    QString extensionTypeName() const { return m_extensionTypeName; }
    void setExtensionTypeName(const QString &name) { m_extensionTypeName = name; }
    enum ExtensionKind {
        NotExtension,
        ExtensionType,
        ExtensionNamespace,
    };
    struct AnnotatedScope
    {
        QQmlJSScope::ConstPtr scope;
        ExtensionKind extensionSpecifier = NotExtension;
    };
    AnnotatedScope extensionType() const
    {
        if (!m_extensionType)
            return { m_extensionType, NotExtension };
        return { m_extensionType,
                 (m_flags & HasExtensionNamespace) ? ExtensionNamespace : ExtensionType };
    }

    QString valueTypeName() const { return m_valueTypeName; }
    void setValueTypeName(const QString &name) { m_valueTypeName = name; }
    QQmlJSScope::ConstPtr valueType() const { return m_valueType; }
    QQmlJSScope::ConstPtr listType() const { return m_listType; }
    QQmlJSScope::Ptr listType() { return m_listType; }

    void addOwnRuntimeFunctionIndex(QQmlJSMetaMethod::AbsoluteFunctionIndex index)
    {
        m_runtimeFunctionIndices.emplaceBack(index);
    }
    QQmlJSMetaMethod::AbsoluteFunctionIndex
    ownRuntimeFunctionIndex(QQmlJSMetaMethod::RelativeFunctionIndex index) const
    {
        const int i = static_cast<int>(index);
        Q_ASSERT(i >= 0);
        Q_ASSERT(i < int(m_runtimeFunctionIndices.size()));
        return m_runtimeFunctionIndices[i];
    }

    bool isSingleton() const { return m_flags & Singleton; }
    bool isCreatable() const;
    bool hasCreatableFlag() const { return m_flags & Creatable; }
    /*!
     * \internal
     *
     * Returns true for objects defined from Qml, and false for objects declared from C++.
     */
    bool isComposite() const { return m_flags & Composite; }
    bool isScript() const { return m_flags & Script; }
    bool hasCustomParser() const { return m_flags & CustomParser; }
    bool isArrayScope() const { return m_flags & Array; }
    bool isInlineComponent() const { return m_flags & InlineComponent; }
    bool isWrappedInImplicitComponent() const { return m_flags & WrappedInImplicitComponent; }
    bool extensionIsNamespace() const { return m_flags & HasExtensionNamespace; }
    void setIsSingleton(bool v) { m_flags.setFlag(Singleton, v); }
    void setCreatableFlag(bool v) { m_flags.setFlag(Creatable, v); }
    void setIsComposite(bool v) { m_flags.setFlag(Composite, v); }
    void setIsScript(bool v) { m_flags.setFlag(Script, v); }
    void setHasCustomParser(bool v)
    {
        m_flags.setFlag(CustomParser, v);;
    }
    void setIsArrayScope(bool v) { m_flags.setFlag(Array, v); }
    void setIsInlineComponent(bool v) { m_flags.setFlag(InlineComponent, v); }
    void setIsWrappedInImplicitComponent(bool v) { m_flags.setFlag(WrappedInImplicitComponent, v); }
    void setExtensionIsNamespace(bool v) { m_flags.setFlag(HasExtensionNamespace, v); }

    bool isListProperty() const { return m_flags.testFlag(IsListProperty); }
    void setIsListProperty(bool v) { m_flags.setFlag(IsListProperty, v); }

    void setAccessSemantics(AccessSemantics semantics) { m_semantics = semantics; }
    AccessSemantics accessSemantics() const { return m_semantics; }
    bool isReferenceType() const { return m_semantics == QQmlJSScope::AccessSemantics::Reference; }
    bool isValueType() const { return m_semantics == QQmlJSScope::AccessSemantics::Value; }

    bool isIdInCurrentQmlScopes(const QString &id) const;
    bool isIdInCurrentJSScopes(const QString &id) const;
    bool isIdInjectedFromSignal(const QString &id) const;

    std::optional<JavaScriptIdentifier> findJSIdentifier(const QString &id) const;

    ConstPtrWrapperIterator childScopesBegin() const { return m_childScopes.constBegin(); }
    ConstPtrWrapperIterator childScopesEnd() const { return m_childScopes.constEnd(); }

    void setInlineComponentName(const QString &inlineComponentName)
    {
        Q_ASSERT(isInlineComponent());
        m_inlineComponentName = inlineComponentName;
    }
    std::optional<QString> inlineComponentName() const;
    InlineComponentOrDocumentRootName enclosingInlineComponentName() const;

    QVector<QQmlJSScope::Ptr> childScopes()
    {
        return m_childScopes;
    }

    QVector<QQmlJSScope::ConstPtr> childScopes() const
    {
        QVector<QQmlJSScope::ConstPtr> result;
        result.reserve(m_childScopes.size());
        for (const auto &child : m_childScopes)
            result.append(child);
        return result;
    }

    static QTypeRevision resolveTypes(
            const Ptr &self, const QQmlJSScope::ContextualTypes &contextualTypes,
            QSet<QString> *usedTypes = nullptr);
    static void resolveNonEnumTypes(
            const QQmlJSScope::Ptr &self, const QQmlJSScope::ContextualTypes &contextualTypes,
            QSet<QString> *usedTypes = nullptr);
    static void resolveEnums(
            const QQmlJSScope::Ptr &self, const QQmlJSScope::ConstPtr &intType);
    static void resolveList(
            const QQmlJSScope::Ptr &self, const QQmlJSScope::ConstPtr &arrayType);
    static void resolveGeneralizedGroup(
            const QQmlJSScope::Ptr &self, const QQmlJSScope::ConstPtr &baseType,
            const QQmlJSScope::ContextualTypes &contextualTypes,
            QSet<QString> *usedTypes = nullptr);

    void setSourceLocation(const QQmlJS::SourceLocation &sourceLocation)
    {
        m_sourceLocation = sourceLocation;
    }

    QQmlJS::SourceLocation sourceLocation() const
    {
        return m_sourceLocation;
    }

    static QQmlJSScope::ConstPtr nonCompositeBaseType(const QQmlJSScope::ConstPtr &type)
    {
        for (QQmlJSScope::ConstPtr base = type; base; base = base->baseType()) {
            if (!base->isComposite())
                return base;
        }
        return {};
    }

    static QTypeRevision nonCompositeBaseRevision(const ImportedScope<QQmlJSScope::ConstPtr> &scope)
    {
        for (auto base = scope; base.scope;
             base = { base.scope->m_baseType.scope, base.scope->m_baseType.revision }) {
            if (!base.scope->isComposite())
                return base.revision;
        }
        return {};
    }

    /*!
      \internal
      Checks whether \a otherScope is the same type as this.

      In addition to checking whether the scopes are identical, we also cover duplicate scopes with
      the same internal name.
    */
    bool isSameType(const QQmlJSScope::ConstPtr &otherScope) const
    {
        return this == otherScope.get()
                || (!this->internalName().isEmpty()
                    && this->internalName() == otherScope->internalName());
    }

    bool inherits(const QQmlJSScope::ConstPtr &base) const
    {
        for (const QQmlJSScope *scope = this; scope; scope = scope->baseType().get()) {
            if (scope->isSameType(base))
                return true;
        }
        return false;
    }

    /*!
      \internal
      Checks whether \a derived type can be assigned to this type. Returns \c
      true if the type hierarchy of \a derived contains a type equal to this.

      \note Assigning \a derived to "QVariant" or "QJSValue" is always possible and
      the function returns \c true in this case. In addition any "QObject" based \a derived type
      can be assigned to a this type if that type is derived from "QQmlComponent".
    */
    bool canAssign(const QQmlJSScope::ConstPtr &derived) const;

    /*!
      \internal
      Checks whether this type or its parents have a custom parser.
    */
    bool isInCustomParserParent() const;

    /*! \internal

        Minimal information about a QQmlJSMetaPropertyBinding that allows it to
        be manipulated similarly to QmlIR::Binding.
    */
    struct QmlIRCompatibilityBindingData
    {
        QmlIRCompatibilityBindingData() = default;
        QmlIRCompatibilityBindingData(const QString &name, quint32 offset)
            : propertyName(name), sourceLocationOffset(offset)
        {
        }
        QString propertyName; // bound property name
        quint32 sourceLocationOffset = 0; // binding's source location offset
    };

    /*! \internal
     *  Finds a type in contextualTypes with given name.
     *  If a type is found, then its name is inserted into usedTypes (when provided).
     *  If contextualTypes has mode INTERNAl, then namespace resolution for enums is
     *  done (eg for Qt::Alignment).
     *  If contextualTypes has mode QML, then inline component resolution is done
     *  ("qmlFileName.IC" is correctly resolved from qmlFileName).
     */
    static ImportedScope<QQmlJSScope::ConstPtr> findType(const QString &name,
                                                         const ContextualTypes &contextualTypes,
                                                         QSet<QString> *usedTypes = nullptr);

private:
    QQmlJSScope() = default;
    QQmlJSScope(const QQmlJSScope &) = default;
    QQmlJSScope &operator=(const QQmlJSScope &) = default;
    static QTypeRevision resolveType(
            const QQmlJSScope::Ptr &self, const ContextualTypes &contextualTypes,
            QSet<QString> *usedTypes);
    static void updateChildScope(
            const QQmlJSScope::Ptr &childScope, const QQmlJSScope::Ptr &self,
            const QQmlJSScope::ContextualTypes &contextualTypes, QSet<QString> *usedTypes);

    void addOwnPropertyBindingInQmlIROrder(const QQmlJSMetaPropertyBinding &binding,
                                           BindingTargetSpecifier specifier);

    QHash<QString, JavaScriptIdentifier> m_jsIdentifiers;

    QMultiHash<QString, QQmlJSMetaMethod> m_methods;
    QHash<QString, QQmlJSMetaProperty> m_properties;
    QMultiHash<QString, QQmlJSMetaPropertyBinding> m_propertyBindings;

    // a special QmlIR compatibility bindings array, ordered the same way as
    // bindings in QmlIR::Object
    QList<QmlIRCompatibilityBindingData> m_propertyBindingsArray;

    // same as QmlIR::Object::runtimeFunctionIndices
    QList<QQmlJSMetaMethod::AbsoluteFunctionIndex> m_runtimeFunctionIndices;

    QHash<QString, QQmlJSMetaEnum> m_enumerations;

    QVector<QQmlJSAnnotation> m_annotations;
    QVector<QQmlJSScope::Ptr> m_childScopes;
    QQmlJSScope::WeakPtr m_parentScope;

    QString m_filePath;
    QString m_internalName;
    QString m_baseTypeNameOrError;

    // We only need the revision for the base type as inheritance is
    // the only relation between two types where the revisions matter.
    ImportedScope<QQmlJSScope::WeakConstPtr> m_baseType;

    ScopeType m_scopeType = QMLScope;
    QStringList m_interfaceNames;
    QStringList m_ownDeferredNames;
    QStringList m_ownImmediateNames;

    QString m_defaultPropertyName;
    QString m_parentPropertyName;
    /*! \internal
     *  The attached type name.
     *  This is an internal name, from a c++ type or a synthetic jsrootgen.
     */
    QString m_attachedTypeName;
    QStringList m_requiredPropertyNames;
    QQmlJSScope::WeakConstPtr m_attachedType;

    /*! \internal
     *  The Value type name.
     *  This is an internal name, from a c++ type or a synthetic jsrootgen.
     */
    QString m_valueTypeName;
    QQmlJSScope::WeakConstPtr m_valueType;
    QQmlJSScope::Ptr m_listType;

    /*!
       The extension is provided as either a type (QML_{NAMESPACE_}EXTENDED) or as a
       namespace (QML_EXTENDED_NAMESPACE).
       The bool HasExtensionNamespace helps differentiating both cases, as namespaces
       have a more limited lookup capaility.
       This is an internal name, from a c++ type or a synthetic jsrootgen.
    */
    QString m_extensionTypeName;
    QQmlJSScope::WeakConstPtr m_extensionType;

    Flags m_flags = Creatable; // all types are marked as creatable by default.
    AccessSemantics m_semantics = AccessSemantics::Reference;

    QQmlJS::SourceLocation m_sourceLocation;

    QString m_qualifiedName;
    QString m_moduleName;

    std::optional<QString> m_inlineComponentName;
};
Q_DECLARE_TYPEINFO(QQmlJSScope::QmlIRCompatibilityBindingData, Q_RELOCATABLE_TYPE);

template<>
class Q_QMLCOMPILER_PRIVATE_EXPORT QDeferredFactory<QQmlJSScope>
{
public:
    QDeferredFactory() = default;

    QDeferredFactory(QQmlJSImporter *importer, const QString &filePath) :
        m_filePath(filePath), m_importer(importer)
    {}

    bool isValid() const
    {
        return !m_filePath.isEmpty() && m_importer != nullptr;
    }

    QString internalName() const
    {
        return QFileInfo(m_filePath).baseName();
    }

    void setIsSingleton(bool isSingleton)
    {
        m_isSingleton = isSingleton;
    }

    void setQualifiedName(const QString &qualifiedName) { m_qualifiedName = qualifiedName; }
    void setModuleName(const QString &moduleName) { m_moduleName = moduleName; }

private:
    friend class QDeferredSharedPointer<QQmlJSScope>;
    friend class QDeferredSharedPointer<const QQmlJSScope>;
    friend class QDeferredWeakPointer<QQmlJSScope>;
    friend class QDeferredWeakPointer<const QQmlJSScope>;

    // Should only be called when lazy-loading the type in a deferred pointer.
    void populate(const QSharedPointer<QQmlJSScope> &scope) const;

    QString m_filePath;
    QQmlJSImporter *m_importer = nullptr;
    bool m_isSingleton = false;
    QString m_qualifiedName;
    QString m_moduleName;
};

using QQmlJSExportedScope = QQmlJSScope::ExportedScope<QQmlJSScope::Ptr>;
using QQmlJSImportedScope = QQmlJSScope::ImportedScope<QQmlJSScope::ConstPtr>;

struct QQmlJSTypeInfo
{
    QMultiHash<QQmlJSScope::ConstPtr, QQmlJSScope::ConstPtr> usedAttachedTypes;
};

QT_END_NAMESPACE

#endif // QQMLJSSCOPE_P_H