cppcodeparser.cpp

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// Copyright (C) 2021 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
 
#include "cppcodeparser.h"
 
#include "access.h"
#include "qmlenumnode.h"
#include "classnode.h"
#include "clangcodeparser.h"
#include "collectionnode.h"
#include "comparisoncategory.h"
#include "config.h"
#include "examplenode.h"
#include "externalpagenode.h"
#include "functionnode.h"
#include "generator.h"
#include "genustypes.h"
#include "headernode.h"
#include "inclusionfilter.h"
#include "inclusionpolicy.h"
#include "namespacenode.h"
#include "qdocdatabase.h"
#include "qmltypenode.h"
#include "qmlpropertyarguments.h"
#include "qmlpropertynode.h"
#include "sharedcommentnode.h"
#include "utilities.h"
 
#include <QtCore/qdebug.h>
#include <QtCore/qmap.h>
 
#include <algorithm>
 
using namespace Qt::Literals::StringLiterals;
 
QT_BEGIN_NAMESPACE
 
/*
  All these can appear in a C++ namespace. Don't add
  anything that can't be in a C++ namespace.
 */
static const QMap<QString, NodeType> s_nodeTypeMap{
    { COMMAND_NAMESPACE, NodeType::Namespace }, { COMMAND_NAMESPACE, NodeType::Namespace },
    { COMMAND_CLASS, NodeType::Class },         { COMMAND_STRUCT, NodeType::Struct },
    { COMMAND_UNION, NodeType::Union },         { COMMAND_ENUM, NodeType::Enum },
    { COMMAND_TYPEALIAS, NodeType::TypeAlias }, { COMMAND_TYPEDEF, NodeType::Typedef },
    { COMMAND_PROPERTY, NodeType::Property },   { COMMAND_VARIABLE, NodeType::Variable }
};
 
typedef bool (Node::*NodeTypeTestFunc)() const;
static const QMap<QString, NodeTypeTestFunc> s_nodeTypeTestFuncMap{
    { COMMAND_NAMESPACE, &Node::isNamespace }, { COMMAND_CLASS, &Node::isClassNode },
    { COMMAND_STRUCT, &Node::isStruct },       { COMMAND_UNION, &Node::isUnion },
    { COMMAND_ENUM, &Node::isEnumType },       { COMMAND_TYPEALIAS, &Node::isTypeAlias },
    { COMMAND_TYPEDEF, &Node::isTypedef },     { COMMAND_PROPERTY, &Node::isProperty },
    { COMMAND_VARIABLE, &Node::isVariable },
};
 
CppCodeParser::CppCodeParser(FnCommandParser&& parser)
    : fn_parser{std::move(parser)}
{
    Config &config = Config::instance();
    QStringList exampleFilePatterns{config.get(CONFIG_EXAMPLES
                                    + Config::dot
                                    + CONFIG_FILEEXTENSIONS).asStringList()};
 
    if (!exampleFilePatterns.isEmpty())
        m_exampleNameFilter = exampleFilePatterns.join(' ');
    else
        m_exampleNameFilter = "*.cpp *.h *.js *.xq *.svg *.xml *.ui";
 
    QStringList exampleImagePatterns{config.get(CONFIG_EXAMPLES
                                                + Config::dot
                                                + CONFIG_IMAGEEXTENSIONS).asStringList()};
 
    if (!exampleImagePatterns.isEmpty())
        m_exampleImageFilter = exampleImagePatterns.join(' ');
    else
        m_exampleImageFilter = "*.png";
 
    m_showLinkErrors = !config.get(CONFIG_NOLINKERRORS).asBool();
}
 
/*!
  Takes the singleton or uncreatable attribute of \a qmlType from its native type
  \a classNode. Attributes given explicitly in the QML documentation win, so a type
  documented as \\qmlsingletontype or \\qmluncreatabletype is left alone.
 */
static void setQmlAttributesFromNativeType(QmlTypeNode *qmlType, const ClassNode *classNode)
{
    if (qmlType->isSingleton() || qmlType->isUncreatable())
        return;
 
    if (classNode->isQmlSingleton())
        qmlType->setSingleton();
    else if (classNode->isQmlUncreatable())
        qmlType->setUncreatable();
}
 
/*!
  Returns \c true if \a doc names the native type of a QML type explicitly, using
  either \\nativetype or the deprecated \\instantiates.
 */
static bool hasNativeTypeCommand(const Doc &doc)
{
    const QSet<QString> metaCommands = doc.metaCommandsUsed();
    return metaCommands.contains(COMMAND_QMLNATIVETYPE)
            || metaCommands.contains(COMMAND_QMLINSTANTIATES);
}
 
/*!
  Process the topic \a command found in the \a doc with argument \a arg.
 */
Node *CppCodeParser::processTopicCommand(const Doc &doc, const QString &command,
                                         const ArgPair &arg)
{
    QDocDatabase* database = QDocDatabase::qdocDB();
 
    if (command == COMMAND_FN) {
        Q_UNREACHABLE();
    } else if (s_nodeTypeMap.contains(command)) {
        /*
          We should only get in here if the command refers to
          something that can appear in a C++ namespace,
          i.e. a class, another namespace, an enum, a typedef,
          a property or a variable. I think these are handled
          this way to allow the writer to refer to the entity
          without including the namespace qualifier.
         */
        NodeType type = s_nodeTypeMap[command];
        QStringList words = arg.first.split(QLatin1Char(' '));
        QStringList path;
        qsizetype idx = 0;
        Node *node = nullptr;
 
        if (type == NodeType::Variable && words.size() > 1)
            idx = words.size() - 1;
        path = words[idx].split("::");
 
        node = database->findNodeByNameAndType(path, s_nodeTypeTestFuncMap[command]);
        // Allow representing a type alias as a class
        if (node == nullptr && command == COMMAND_CLASS) {
            node = database->findNodeByNameAndType(path, &Node::isTypeAlias);
            if (node) {
                const auto &access = node->access();
                const auto &loc = node->location();
                const auto &templateDecl = node->templateDecl();
                node = new ClassNode(NodeType::Class, node->parent(), node->name());
                node->setAccess(access);
                node->setLocation(loc);
                node->setTemplateDecl(templateDecl);
            }
        }
        if (node == nullptr) {
            if (CodeParser::isWorthWarningAbout(doc)) {
                doc.location().warning(
                        QStringLiteral("Cannot find '%1' specified with '\\%2' in any header file")
                                .arg(arg.first, command));
            }
        } else if (node->isAggregate()) {
            if (type == NodeType::Namespace) {
                auto *ns = static_cast<NamespaceNode *>(node);
                ns->markSeen();
                ns->setWhereDocumented(ns->tree()->camelCaseModuleName());
            }
        }
        return node;
    } else if (command == COMMAND_EXAMPLE) {
        if (Config::generateExamples) {
            auto *en = new ExampleNode(database->primaryTreeRoot(), arg.first);
            en->setLocation(doc.startLocation());
            setExampleFileLists(en);
            return en;
        }
    } else if (command == COMMAND_EXTERNALPAGE) {
        auto *epn = new ExternalPageNode(database->primaryTreeRoot(), arg.first);
        epn->setLocation(doc.startLocation());
        return epn;
    } else if (command == COMMAND_HEADERFILE) {
        auto *hn = new HeaderNode(database->primaryTreeRoot(), arg.first);
        hn->setLocation(doc.startLocation());
        return hn;
    } else if (command == COMMAND_GROUP) {
        CollectionNode *cn = database->addGroup(arg.first);
        cn->setLocation(doc.startLocation());
        cn->markSeen();
        return cn;
    } else if (command == COMMAND_MODULE) {
        CollectionNode *cn = database->addModule(arg.first);
        cn->setLocation(doc.startLocation());
        cn->markSeen();
        return cn;
    } else if (command == COMMAND_CONCEPT) {
        CollectionNode *cn = database->addConcept(arg.first);
        // Default the page title to the concept's name. A documented
        // concept rarely carries a separate \title, yet its reference
        // page still needs a heading; an authored \title overrides this.
        cn->setTitle(arg.first);
        cn->setLocation(doc.startLocation());
        cn->markSeen();
        return cn;
    } else if (command == COMMAND_QMLMODULE) {
        QStringList blankSplit = arg.first.split(QLatin1Char(' '));
        CollectionNode *cn = database->addQmlModule(blankSplit[0]);
        cn->setLogicalModuleInfo(blankSplit);
        cn->setLocation(doc.startLocation());
        cn->markSeen();
        return cn;
    } else if (command == COMMAND_PAGE) {
        auto *pn = new PageNode(database->primaryTreeRoot(), arg.first.split(' ').front());
        pn->setLocation(doc.startLocation());
        return pn;
    } else if (command == COMMAND_QMLTYPE || command == COMMAND_QMLSINGLETONTYPE
               || command == COMMAND_QMLUNCREATABLETYPE || command == COMMAND_QMLVALUETYPE
               || command == COMMAND_QMLBASICTYPE) {
        auto nodeType = (command == COMMAND_QMLVALUETYPE || command == COMMAND_QMLBASICTYPE)
                ? NodeType::QmlValueType
                : NodeType::QmlType;
        QString qmid;
        if (auto args = doc.metaCommandArgs(COMMAND_INQMLMODULE); !args.isEmpty())
            qmid = args.first().first;
        auto *qcn = database->findQmlTypeInPrimaryTree(qmid, arg.first);
        // A \qmlproperty may have already constructed a placeholder type
        // without providing a module identifier; allow such cases
        if (!qcn && !qmid.isEmpty()) {
            qcn = database->findQmlTypeInPrimaryTree(QString(), arg.first);
            if (qcn && !qcn->logicalModuleName().isEmpty())
                qcn = nullptr;
        }
        if (!qcn || qcn->nodeType() != nodeType)
            qcn = new QmlTypeNode(database->primaryTreeRoot(), arg.first, nodeType);
        if (!qmid.isEmpty())
            database->addToQmlModule(qmid, qcn);
        qcn->setLocation(doc.startLocation());
        if (command == COMMAND_QMLSINGLETONTYPE)
            qcn->setSingleton();
        else if (command == COMMAND_QMLUNCREATABLETYPE)
            qcn->setUncreatable();
        else if (command == COMMAND_QMLTYPE && !hasNativeTypeCommand(doc)) {
            // If the native type is named explicitly, the attributes are taken from it in
            // processQmlNativeTypeCommand(). Without such a command, guess the native type
            // by matching the QML type name against a class of the same name. QML type
            // names live in a different namespace than C++ class names, so the guess may
            // well hit an unrelated class.
            // TODO: Replace name-based matching with QML_ELEMENT/QML_NAMED_ELEMENT macro
            // detection and automatically setting the native type relationship.
            if (auto classNode = database->findClassNode(arg.first.split(u"::"_s)))
                setQmlAttributesFromNativeType(qcn, classNode);
        }
        return qcn;
    } else if (command == COMMAND_QMLENUM) {
        return processQmlEnumTopic(doc.enumItemNames(), doc.location(), arg.first);
    } else if ((command == COMMAND_QMLSIGNAL) || (command == COMMAND_QMLMETHOD)
               || (command == COMMAND_QMLATTACHEDSIGNAL)
               || (command == COMMAND_QMLATTACHEDMETHOD)) {
        Q_UNREACHABLE();
    }
    return nullptr;
}
 
/*!
    Finds a QmlTypeNode \a name, under the specific \a moduleName, from the primary tree.
    If one is not found, creates one.
 
    Returns the found or created node.
*/
QmlTypeNode *findOrCreateQmlType(const QString &moduleName, const QString &name, const Location &location)
{
    QDocDatabase* database = QDocDatabase::qdocDB();
    auto *aggregate = database->findQmlTypeInPrimaryTree(moduleName, name);
    // Note: Constructing a QmlType node by default, as opposed to QmlValueType.
    // This may lead to unexpected behavior if documenting \qmlvaluetype's members
    // before the type itself.
    if (!aggregate) {
        aggregate = new QmlTypeNode(database->primaryTreeRoot(), name, NodeType::QmlType);
        aggregate->setLocation(location);
        if (!moduleName.isEmpty())
            database->addToQmlModule(moduleName, aggregate);
    }
    return aggregate;
}
 
std::vector<TiedDocumentation> CppCodeParser::processQmlProperties(const UntiedDocumentation &untied)
{
    const Doc &doc = untied.documentation;
    const TopicList &topics = doc.topicsUsed();
    if (topics.isEmpty())
        return {};
 
    std::vector<TiedDocumentation> tied{};
 
    auto firstTopicArgs =
            QmlPropertyArguments::parse(topics.at(0).m_args, doc.location(),
                    QmlPropertyArguments::ParsingOptions::RequireQualifiedPath);
    if (!firstTopicArgs)
        return {};
 
    NodeList sharedNodes;
    auto *qmlType = findOrCreateQmlType((*firstTopicArgs).m_module, (*firstTopicArgs).m_qmltype, doc.startLocation());
 
    for (const auto &topicCommand : topics) {
        QString cmd = topicCommand.m_topic;
        if ((cmd == COMMAND_QMLPROPERTY) || (cmd == COMMAND_QMLATTACHEDPROPERTY)) {
            bool attached = cmd.contains(QLatin1String("attached"));
            if (auto qpa = QmlPropertyArguments::parse(topicCommand.m_args, doc.location(),
                    QmlPropertyArguments::ParsingOptions::RequireQualifiedPath)) {
                if (qmlType != QDocDatabase::qdocDB()->findQmlTypeInPrimaryTree(qpa->m_module, qpa->m_qmltype)) {
                    doc.startLocation().warning(
                            QStringLiteral(
                                    "All properties in a group must belong to the same type: '%1'")
                                    .arg(topicCommand.m_args));
                    continue;
                }
                Aggregate::PropertySearchType searchType = attached ? Aggregate::AttachedProperties
                                                                    : Aggregate::UnattachedProperties;
                QmlPropertyNode *existingProperty = qmlType->hasQmlProperty(qpa->m_name, searchType);
                if (existingProperty) {
                    processMetaCommands(doc, existingProperty);
                    if (!doc.body().isEmpty()) {
                        doc.startLocation().warning(
                                QStringLiteral("QML property documented multiple times: '%1'")
                                        .arg(topicCommand.m_args), QStringLiteral("also seen here: %1")
                                                .arg(existingProperty->location().toString()));
                    }
                    continue;
                }
                auto *qpn = new QmlPropertyNode(qmlType, qpa->m_name, qpa->m_type, attached);
                qpn->setIsList(qpa->m_isList);
                qpn->setLocation(doc.startLocation());
                qpn->setGenus(Genus::QML);
 
                tied.emplace_back(TiedDocumentation{doc, qpn});
 
                sharedNodes << qpn;
            }
        } else {
            doc.startLocation().warning(
                    QStringLiteral("Command '\\%1'; not allowed with QML property commands")
                            .arg(cmd));
        }
    }
 
    // Construct a SharedCommentNode (scn) if multiple topics generated
    // valid nodes. Note that it's important to do this *after* constructing
    // the topic nodes - which need to be written to index before the related
    // scn.
    if (sharedNodes.size() > 1) {
        // Resolve QML property group identifier (if any) from the first topic
        // command arguments.
        QString group;
        if (auto dot = (*firstTopicArgs).m_name.indexOf('.'_L1); dot != -1)
            group = (*firstTopicArgs).m_name.left(dot);
        auto *scn = new SharedCommentNode(qmlType, sharedNodes.size(), group);
        scn->setLocation(doc.startLocation());
 
        tied.emplace_back(TiedDocumentation{doc, scn});
 
        for (const auto n : sharedNodes)
            scn->append(n);
        scn->sort();
    }
 
    return tied;
}
 
/*!
  Process the metacommand \a command in the context of the
  \a node associated with the topic command and the \a doc.
  \a arg is the argument to the metacommand.
 
  \a node is guaranteed to be non-null.
 */
void CppCodeParser::processMetaCommand(const Doc &doc, const QString &command,
                                       const ArgPair &argPair, Node *node)
{
    QDocDatabase* database = QDocDatabase::qdocDB();
 
    QString arg = argPair.first;
    if (command == COMMAND_INHEADERFILE) {
        // TODO: [incorrect-constructs][header-arg]
        // The emptiness check for arg is required as,
        // currently, DocParser fancies passing (without any warning)
        // incorrect constructs doen the chain, such as an
        // "\inheaderfile" command with no argument.
        //
        // As it is the case here, we require further sanity checks to
        // preserve some of the semantic for the later phases.
        // This generally has a ripple effect on the whole codebase,
        // making it more complex and increasesing the surface of bugs.
        //
        // The following emptiness check should be removed as soon as
        // DocParser is enhanced with correct semantics.
        if (node->isAggregate() && !arg.isEmpty())
            static_cast<Aggregate *>(node)->setIncludeFile(arg);
        else
            doc.location().warning(QStringLiteral("Ignored '\\%1'").arg(COMMAND_INHEADERFILE));
    } else if (command == COMMAND_COMPARES) {
        processComparesCommand(node, arg, doc.location());
    } else if (command == COMMAND_COMPARESWITH) {
        if (!node->isClassNode())
            doc.location().warning(
                    u"Found \\%1 command outside of \\%2 context."_s
                            .arg(COMMAND_COMPARESWITH, COMMAND_CLASS));
    } else if (command == COMMAND_OVERLOAD) {
        /*
          Note that this might set the overload flag of the
          primary function. This is ok because the overload
          flags and overload numbers will be resolved later
          in Aggregate::normalizeOverloads().
         */
        processOverloadCommand(node, doc);
    } else if (command == COMMAND_REIMP) {
        if (node->parent() && !node->parent()->isInternal()) {
            if (node->isFunction()) {
                auto *fn = static_cast<FunctionNode *>(node);
                // The clang visitor class will have set the
                // qualified name of the overridden function.
                // If the name of the overridden function isn't
                // set, issue a warning.
                if (fn->overridesThis().isEmpty() && CodeParser::isWorthWarningAbout(doc)) {
                    doc.location().warning(
                            QStringLiteral("Cannot find base function for '\\%1' in %2()")
                                    .arg(COMMAND_REIMP, node->name()),
                            QStringLiteral("The function either doesn't exist in any "
                                           "base class with the same signature or it "
                                           "exists but isn't virtual."));
                }
                fn->setReimpFlag();
            } else {
                doc.location().warning(
                        QStringLiteral("Ignored '\\%1' in %2").arg(COMMAND_REIMP, node->name()));
            }
        }
    } else if (command == COMMAND_RELATES) {
        // REMARK: Generates warnings only; Node instances are
        // adopted from the root namespace to other Aggregates
        // in a post-processing step, Aggregate::resolveRelates(),
        // after all topic commands are processed.
        if (node->isAggregate()) {
            doc.location().warning("Invalid '\\%1' not allowed in '\\%2'"_L1
                    .arg(COMMAND_RELATES, node->nodeTypeString()));
        }
    } else if (command == COMMAND_NEXTPAGE) {
        CodeParser::setLink(node, Node::NextLink, arg);
    } else if (command == COMMAND_PREVIOUSPAGE) {
        CodeParser::setLink(node, Node::PreviousLink, arg);
    } else if (command == COMMAND_STARTPAGE) {
        CodeParser::setLink(node, Node::StartLink, arg);
    } else if (command == COMMAND_QMLINHERITS) {
        if (node->name() == arg)
            doc.location().warning(QStringLiteral("%1 tries to inherit itself").arg(arg));
        else if (node->isQmlType()) {
            auto *qmlType = static_cast<QmlTypeNode *>(node);
            qmlType->setQmlBaseName(arg);
        }
    } else if (command == COMMAND_QMLNATIVETYPE || command == COMMAND_QMLINSTANTIATES) {
        if (command == COMMAND_QMLINSTANTIATES)
            doc.location().report(
                    u"\\instantiates is deprecated and will be removed in a future version. Use \\nativetype instead."_s);
        // TODO: COMMAND_QMLINSTANTIATES is deprecated since 6.8. Its remains should be removed no later than Qt 7.0.0.
        processQmlNativeTypeCommand(node, command, arg, doc.location());
    } else if (command == COMMAND_DEFAULT) {
        if (!node->isQmlProperty()) {
            doc.location().warning(QStringLiteral("Ignored '\\%1', applies only to '\\%2'")
                    .arg(command, COMMAND_QMLPROPERTY));
        } else if (arg.isEmpty()) {
            doc.location().warning(QStringLiteral("Expected an argument for '\\%1' (maybe you meant '\\%2'?)")
                    .arg(command, COMMAND_QMLDEFAULT));
        } else {
            static_cast<QmlPropertyNode *>(node)->setDefaultValue(arg);
        }
    } else if (command == COMMAND_QMLDEFAULT) {
        node->markDefault();
    } else if (command == COMMAND_QMLENUMERATORSFROM) {
        NativeEnum *nativeEnum{nullptr};
        if (auto *ne_if = dynamic_cast<NativeEnumInterface *>(node))
            nativeEnum = ne_if->nativeEnum();
        else {
            doc.location().warning("Ignored '\\%1', applies only to '\\%2' and '\\%3'"_L1
                    .arg(command, COMMAND_QMLPROPERTY, COMMAND_QMLENUM));
            return;
        }
        if (!nativeEnum->resolve(argPair.first, argPair.second)) {
            doc.location().warning("Failed to find C++ enumeration '%2' passed to \\%1"_L1
                    .arg(command, arg), "Use \\value commands instead"_L1);
        }
    } else if (command == COMMAND_QMLREADONLY) {
        node->markReadOnly(true);
    }  else if (command == COMMAND_QMLREQUIRED) {
        if (!node->isQmlProperty())
            doc.location().warning(QStringLiteral("Ignored '\\%1'").arg(COMMAND_QMLREQUIRED));
        else
            static_cast<QmlPropertyNode *>(node)->setRequired();
    } else if ((command == COMMAND_QMLABSTRACT) || (command == COMMAND_ABSTRACT)) {
        if (node->isQmlType())
            node->setAbstract(true);
    } else if (command == COMMAND_DEPRECATED) {
        node->setDeprecated(argPair.second);
    } else if (command == COMMAND_INGROUP || command == COMMAND_INPUBLICGROUP) {
        // Note: \ingroup and \inpublicgroup are the same (and now recognized as such).
        database->addToGroup(arg, node);
    } else if (command == COMMAND_INMODULE) {
        database->addToModule(arg, node);
    } else if (command == COMMAND_INQMLMODULE) {
        // Handled when parsing topic commands
    } else if (command == COMMAND_OBSOLETE) {
        node->setStatus(Status::Deprecated);
    } else if (command == COMMAND_NONREENTRANT) {
        node->setThreadSafeness(Node::NonReentrant);
    } else if (command == COMMAND_PRELIMINARY) {
        // \internal wins.
        if (!node->isInternal())
            node->setStatus(Status::Preliminary);
    } else if (command == COMMAND_INTERNAL) {
        node->markInternal();
    } else if (command == COMMAND_REENTRANT) {
        node->setThreadSafeness(Node::Reentrant);
    } else if (command == COMMAND_SINCE) {
        node->setSince(arg);
    } else if (command == COMMAND_WRAPPER) {
        node->setWrapper();
    } else if (command == COMMAND_THREADSAFE) {
        node->setThreadSafeness(Node::ThreadSafe);
    } else if (command == COMMAND_SUBTITLE) {
        if (!node->setSubtitle(arg))
            doc.location().warning(QStringLiteral("Ignored '\\%1'").arg(COMMAND_SUBTITLE));
    } else if (command == COMMAND_QTVARIABLE) {
        node->setQtVariable(arg);
        if (!node->isModule() && !node->isQmlModule())
            doc.location().warning(
                    QStringLiteral(
                            "Command '\\%1' is only meaningful in '\\module' and '\\qmlmodule'.")
                            .arg(COMMAND_QTVARIABLE));
    } else if (command == COMMAND_QTCMAKEPACKAGE) {
        if (node->isModule())
            node->setCMakeComponent(arg);
        else
            doc.location().warning(
                    QStringLiteral("Command '\\%1' is only meaningful in '\\module'.")
                            .arg(COMMAND_QTCMAKEPACKAGE));
    } else if (command == COMMAND_QTCMAKETARGETITEM) {
        if (node->isModule())
            node->setCMakeTargetItem(QLatin1String("Qt6::") + arg);
        else
            doc.location().warning(
                    QStringLiteral("Command '\\%1' is only meaningful in '\\module'.")
                            .arg(COMMAND_QTCMAKETARGETITEM));
    } else if (command == COMMAND_CMAKEPACKAGE) {
        if (node->isModule())
            node->setCMakePackage(arg);
        else
            doc.location().warning(
                    QStringLiteral("Command '\\%1' is only meaningful in '\\module'.")
                            .arg(COMMAND_CMAKEPACKAGE));
    } else if (command == COMMAND_CMAKECOMPONENT) {
        if (node->isModule())
            node->setCMakeComponent(arg);
        else
            doc.location().warning(
                    QStringLiteral("Command '\\%1' is only meaningful in '\\module'.")
                            .arg(COMMAND_CMAKECOMPONENT));
    } else if (command == COMMAND_CMAKETARGETITEM) {
        if (node->isModule())
            node->setCMakeTargetItem(arg);
        else
            doc.location().warning(
                    QStringLiteral("Command '\\%1' is only meaningful in '\\module'.")
                            .arg(COMMAND_CMAKETARGETITEM));
    } else if (command == COMMAND_MODULESTATE) {
        if (!node->isModule() && !node->isQmlModule()) {
            doc.location().warning(
                    QStringLiteral(
                            "Command '\\%1' is only meaningful in '\\module' and '\\qmlmodule'.")
                            .arg(COMMAND_MODULESTATE));
        } else if (!node->isPreliminary() && !node->isInternal()) {
            static_cast<CollectionNode*>(node)->setState(arg);
        }
    } else if (command == COMMAND_NOAUTOLIST) {
        if (!node->isCollectionNode() && !node->isExample()) {
            doc.location().warning(
                    QStringLiteral(
                            "Command '\\%1' is only meaningful in '\\module', '\\qmlmodule', `\\group` and `\\example`.")
                            .arg(COMMAND_NOAUTOLIST));
        } else {
            static_cast<PageNode*>(node)->setNoAutoList(true);
        }
    } else if (command == COMMAND_ATTRIBUTION) {
        // TODO: This condition is not currently exact enough, as it
        // will allow any non-aggregate `PageNode` to use the command,
        // For example, an `ExampleNode`.
        //
        // The command is intended only for internal usage by
        // "qattributionscanner" and should only work on `PageNode`s
        // that are generated from a "\page" command.
        //
        // It is already possible to provide a more restricted check,
        // albeit in a somewhat dirty way. It is not expected that
        // this warning will have any particular use.
        // If it so happens that a case where the too-broad scope of
        // the warning is a problem or hides a bug, modify the
        // condition to be restrictive enough.
        // Otherwise, wait until a more torough look at QDoc's
        // internal representations an way to enable "Attribution
        // Pages" is performed before looking at the issue again.
        if (!node->isTextPageNode()) {
            doc.location().warning(u"Command '\\%1' is only meaningful in '\\%2'"_s.arg(COMMAND_ATTRIBUTION, COMMAND_PAGE));
        } else { static_cast<PageNode*>(node)->markAttribution(); }
    }
}
 
/*!
    \internal
    Processes the argument \a arg that's passed to the \\compares command,
    and sets the comparison category of the \a node accordingly.
 
    If the argument is invalid, issue a warning at the location the command
    appears through \a loc.
*/
void CppCodeParser::processComparesCommand(Node *node, const QString &arg, const Location &loc)
{
    if (!node->isClassNode()) {
        loc.warning(u"Found \\%1 command outside of \\%2 context."_s.arg(COMMAND_COMPARES,
                                                                         COMMAND_CLASS));
        return;
    }
 
    if (auto category = comparisonCategoryFromString(arg.toStdString());
            category != ComparisonCategory::None) {
        node->setComparisonCategory(category);
    } else {
        loc.warning(u"Invalid argument to \\%1 command: `%2`"_s.arg(COMMAND_COMPARES, arg),
                    u"Valid arguments are `strong`, `weak`, `partial`, or `equality`."_s);
    }
}
 
/*!
    Processes the \\overload command for the given \a node and \a doc.
    Handles both regular overloads and primary overloads (\\overload primary).
    Issues warnings for multiple primary overloads with location references.
*/
void CppCodeParser::processOverloadCommand(Node *node, const Doc &doc)
{
    if (node->isFunction()) {
        auto *fn = static_cast<FunctionNode *>(node);
 
        // If this function is part of a SharedCommentNode, skip processing here.
        // The SharedCommentNode will handle \overload primary position-dependently.
        if (fn->sharedCommentNode())
            return;
 
        // Check if this is "\overload primary"
        const auto &overloadArgs = doc.overloadList();
        if (!overloadArgs.isEmpty()
            && overloadArgs.first().first == "__qdoc_primary_overload__"_L1) {
 
            // Note: We don't check for duplicate primary overloads here because
            // Doc locations may not be fully initialized yet, especially for
            // shared comment nodes with multiple \fn commands.
            // The check is done later in Aggregate::normalizeOverloads().
 
            fn->setPrimaryOverloadFlag();
            // Primary overloads are still overloads, so set both flags
            fn->setOverloadFlag();
        } else {
            fn->setOverloadFlag();
        }
    } else if (node->isSharedCommentNode()) {
        static_cast<SharedCommentNode *>(node)->setOverloadFlags();
    } else {
        doc.location().warning("Ignored '\\%1'"_L1.arg(COMMAND_OVERLOAD));
    }
}
 
/*!
  The topic command has been processed, and now \a doc and
  \a node are passed to this function to get the metacommands
  from \a doc and process them one at a time. \a node is the
  node where \a doc resides.
 */
void CppCodeParser::processMetaCommands(const Doc &doc, Node *node)
{
    std::vector<Node*> nodes_to_process{};
    if (node->isSharedCommentNode()) {
        auto scn = static_cast<SharedCommentNode*>(node);
 
        nodes_to_process.reserve(scn->count() + 1);
        std::copy(scn->collective().cbegin(), scn->collective().cend(), std::back_inserter(nodes_to_process));
    }
 
    // REMARK: Ordering is important here. If node is a
    // SharedCommentNode it MUST be processed after all its child
    // nodes.
    // Failure to do so can incur in incorrect warnings.
    // For example, if a shared documentation has a "\relates" command.
    // When the command is processed for the SharedCommentNode it will
    // apply to all its child nodes.
    // If a child node is processed after the SharedCommentNode that
    // contains it, that "\relates" command will be considered applied
    // already, resulting in a warning.
    nodes_to_process.push_back(node);
 
    const QStringList metaCommandsUsed = doc.metaCommandsUsed().values();
    for (const auto &command : metaCommandsUsed) {
        const ArgList args = doc.metaCommandArgs(command);
        for (const auto &arg : args) {
            std::for_each(nodes_to_process.cbegin(), nodes_to_process.cend(), [doc, command, arg](auto node){
                processMetaCommand(doc, command, arg, node);
            });
        }
    }
 
    // Apply a title (stripped of formatting) to the Node if set
    if (!doc.title().isEmpty()) {
        if (!node->setTitle(doc.title().toString()))
            doc.location().warning(QStringLiteral("Ignored '\\title'"));
        if (node->isExample())
            QDocDatabase::qdocDB()->addExampleNode(static_cast<ExampleNode *>(node));
    }
}
 
/*!
    Creates an EnumNode instance explicitly for the \qmlenum command.
    Utilizes QmlPropertyArguments for argument (\a arg) parsing.
 
    Adds a list of \a enumItemNames as enumerators to facilitate linking
    via enumerator names.
*/
EnumNode *CppCodeParser::processQmlEnumTopic(const QStringList &enumItemNames,
                                             const Location &location, const QString &arg)
{
    if (arg.isEmpty()) {
        location.warning(u"Missing argument to \\%1 command."_s.arg(COMMAND_QMLENUM));
        return nullptr;
    }
 
    auto parsedArgs = QmlPropertyArguments::parse(arg, location,
            QmlPropertyArguments::ParsingOptions::RequireQualifiedPath |
            QmlPropertyArguments::ParsingOptions::IgnoreType);
 
    if (!parsedArgs)
        return nullptr;
 
    auto *qmlType = findOrCreateQmlType((*parsedArgs).m_module, (*parsedArgs).m_qmltype, location);
 
    auto *enumNode = new QmlEnumNode(qmlType, (*parsedArgs).m_name);
    enumNode->setLocation(location);
 
    for (const auto &item : enumItemNames)
        enumNode->addItem(EnumItem(item, 0));
 
    return enumNode;
}
 
/*!
 Parse QML signal/method topic commands.
 */
FunctionNode *CppCodeParser::parseOtherFuncArg(const QString &topic, const Location &location,
                                               const QString &funcArg)
{
    auto parsingOpts { QmlPropertyArguments::ParsingOptions::RequireQualifiedPath };
 
    // Signatures for QML signals require no return type. Parameter list is optional.
    if (topic.contains("signal"_L1))
        parsingOpts = parsingOpts | QmlPropertyArguments::ParsingOptions::IgnoreType;
    else
        parsingOpts = parsingOpts | QmlPropertyArguments::ParsingOptions::ParseAsMethod;
 
 
    auto methodArgs = QmlPropertyArguments::parse(funcArg, location, parsingOpts);
    if (!methodArgs)
        return nullptr;
 
    auto *aggregate = findOrCreateQmlType((*methodArgs).m_module,
                                          (*methodArgs).m_qmltype, location);
 
    Metaness metaness = FunctionNode::getMetanessFromTopic(topic);
    bool attached = topic.contains("attached"_L1);
    auto *fn = new FunctionNode(metaness, aggregate, (*methodArgs).m_name, attached);
    fn->setAccess(Access::Public);
    fn->setLocation(location);
    fn->setReturnType((*methodArgs).m_type);
    fn->setParameters((*methodArgs).m_params);
    return fn;
}
 
/*!
  Parse the macro arguments in \a macroArg ad hoc, without using
  any actual parser. If successful, return a pointer to the new
  FunctionNode for the macro. Otherwise return null. \a location
  is used for reporting errors.
 */
FunctionNode *CppCodeParser::parseMacroArg(const Location &location, const QString &macroArg)
{
    QDocDatabase* database = QDocDatabase::qdocDB();
 
    QStringList leftParenSplit = macroArg.split('(');
    if (leftParenSplit.isEmpty())
        return nullptr;
    QString macroName;
    FunctionNode *oldMacroNode = nullptr;
    QStringList blankSplit = leftParenSplit[0].split(' ');
    if (!blankSplit.empty()) {
        macroName = blankSplit.last();
        oldMacroNode = database->findMacroNode(macroName);
    }
    QString returnType;
    if (blankSplit.size() > 1) {
        blankSplit.removeLast();
        returnType = blankSplit.join(' ');
    }
    QString params;
    if (leftParenSplit.size() > 1) {
        params = QString("");
        const QString &afterParen = leftParenSplit.at(1);
        qsizetype rightParen = afterParen.indexOf(')');
        if (rightParen >= 0)
            params = afterParen.left(rightParen);
    }
    int i = 0;
    while (i < macroName.size() && !macroName.at(i).isLetter())
        i++;
    if (i > 0) {
        returnType += QChar(' ') + macroName.left(i);
        macroName = macroName.mid(i);
    }
    Metaness metaness = Metaness::MacroWithParams;
    if (params.isNull())
        metaness = Metaness::MacroWithoutParams;
    auto *macro = new FunctionNode(metaness, database->primaryTreeRoot(), macroName);
    macro->setAccess(Access::Public);
    macro->setLocation(location);
    macro->setReturnType(returnType);
    macro->setParameters(params);
    if (oldMacroNode && macro->parent() == oldMacroNode->parent()
                && compare(macro, oldMacroNode) == 0) {
        location.warning(QStringLiteral("\\macro %1 documented more than once")
                .arg(macroArg), QStringLiteral("also seen here: %1")
                        .arg(oldMacroNode->doc().location().toString()));
    }
    return macro;
}
 
void CppCodeParser::setExampleFileLists(ExampleNode *en)
{
    Config &config = Config::instance();
    QString fullPath = config.getExampleProjectFile(en->name());
    if (fullPath.isEmpty()) {
        QString details = QLatin1String("Example directories: ")
                + config.getCanonicalPathList(CONFIG_EXAMPLEDIRS).join(QLatin1Char(' '));
        en->location().warning(
                QStringLiteral("Cannot find project file for example '%1'").arg(en->name()),
                details);
        return;
    }
 
    QDir exampleDir(QFileInfo(fullPath).dir());
 
    const auto& [excludeDirs, excludeFiles] = config.getExcludedPaths();
 
    QStringList exampleFiles = Config::getFilesHere(exampleDir.path(), m_exampleNameFilter,
                                                    Location(), excludeDirs, excludeFiles);
    // Search for all image files under the example project, excluding doc/images directory.
    QSet<QString> excludeDocDirs(excludeDirs);
    excludeDocDirs.insert(exampleDir.path() + QLatin1String("/doc/images"));
    QStringList imageFiles = Config::getFilesHere(exampleDir.path(), m_exampleImageFilter,
                                                  Location(), excludeDocDirs, excludeFiles);
    if (!exampleFiles.isEmpty()) {
        // move main.cpp to the end, if it exists
        QString mainCpp;
 
        const auto isGeneratedOrMainCpp = [&mainCpp](const QString &fileName) {
            if (fileName.endsWith("/main.cpp")) {
                if (mainCpp.isEmpty())
                    mainCpp = fileName;
                return true;
            }
            return Utilities::isGeneratedFile(fileName);
        };
 
        exampleFiles.erase(
                std::remove_if(exampleFiles.begin(), exampleFiles.end(), isGeneratedOrMainCpp),
                exampleFiles.end());
 
        if (!mainCpp.isEmpty())
            exampleFiles.append(mainCpp);
 
        // Add any resource and project files
        exampleFiles += Config::getFilesHere(exampleDir.path(),
                QLatin1String("*.qrc *.pro *.qmlproject *.pyproject CMakeLists.txt qmldir"),
                Location(), excludeDirs, excludeFiles);
    }
 
    const qsizetype pathLen = exampleDir.path().size() - en->name().size();
    for (auto &file : exampleFiles)
        file = file.mid(pathLen);
    for (auto &file : imageFiles)
        file = file.mid(pathLen);
 
    en->setFiles(exampleFiles, fullPath.mid(pathLen));
    en->setImages(imageFiles);
}
 
/*!
  returns true if \a t is \e {qmlsignal}, \e {qmlmethod},
  \e {qmlattachedsignal}, or \e {qmlattachedmethod}.
 */
bool CppCodeParser::isQMLMethodTopic(const QString &t)
{
    return (t == COMMAND_QMLSIGNAL || t == COMMAND_QMLMETHOD || t == COMMAND_QMLATTACHEDSIGNAL
            || t == COMMAND_QMLATTACHEDMETHOD);
}
 
/*!
  Returns true if \a t is \e {qmlproperty}, \e {qmlpropertygroup},
  or \e {qmlattachedproperty}.
 */
bool CppCodeParser::isQMLPropertyTopic(const QString &t)
{
    return (t == COMMAND_QMLPROPERTY || t == COMMAND_QMLATTACHEDPROPERTY);
}
 
std::pair<std::vector<TiedDocumentation>, std::vector<FnMatchError>>
CppCodeParser::processTopicArgs(const UntiedDocumentation &untied)
{
    const Doc &doc = untied.documentation;
 
    if (doc.topicsUsed().isEmpty())
        return {};
 
    QDocDatabase *database = QDocDatabase::qdocDB();
 
    const QString topic = doc.topicsUsed().first().m_topic;
 
    std::vector<TiedDocumentation> tied{};
    std::vector<FnMatchError> errors{};
 
    if (isQMLPropertyTopic(topic)) {
        auto tied_qml = processQmlProperties(untied);
        tied.insert(tied.end(), tied_qml.begin(), tied_qml.end());
    } else {
        ArgList args = doc.metaCommandArgs(topic);
        Node *node = nullptr;
        if (args.size() == 1) {
            if (topic == COMMAND_FN) {
                auto result = fn_parser(doc.location(), args[0].first, args[0].second, untied.context);
                if (auto *error = std::get_if<FnMatchError>(&result)) {
                    const InclusionPolicy policy = Config::instance().createInclusionPolicy();
                    if (!doc.isInternal() || InclusionFilter::processInternalDocs(policy))
                        errors.emplace_back(*error);
                } else {
                    node = std::get<Node*>(result);
                }
            } else if (topic == COMMAND_MACRO) {
                node = parseMacroArg(doc.location(), args[0].first);
            } else if (isQMLMethodTopic(topic)) {
                node = parseOtherFuncArg(topic, doc.location(), args[0].first);
            } else if (topic == COMMAND_DONTDOCUMENT) {
                database->primaryTree()->addToDontDocumentMap(args[0].first);
            } else {
                node = processTopicCommand(doc, topic, args[0]);
            }
            if (node != nullptr) {
                tied.emplace_back(TiedDocumentation{doc, node});
            }
        } else if (args.size() > 1) {
            // Find nodes for each of the topic commands and add them to shared
            // comment nodes.
            QList<SharedCommentNode *> sharedCommentNodes;
            for (const auto &arg : std::as_const(args)) {
                node = nullptr;
                if (topic == COMMAND_FN) {
                    auto result = fn_parser(doc.location(), arg.first, arg.second, untied.context);
                    if (auto *error = std::get_if<FnMatchError>(&result)) {
                        const InclusionPolicy policy = Config::instance().createInclusionPolicy();
                        if (!doc.isInternal() || InclusionFilter::processInternalDocs(policy))
                            errors.emplace_back(*error);
                    } else {
                        node = std::get<Node*>(result);
                    }
                } else if (topic == COMMAND_MACRO) {
                    node = parseMacroArg(doc.location(), arg.first);
                } else if (isQMLMethodTopic(topic)) {
                    node = parseOtherFuncArg(topic, doc.location(), arg.first);
                } else {
                    node = processTopicCommand(doc, topic, arg);
                }
                if (node != nullptr) {
                    bool found = false;
                    for (SharedCommentNode *scn : sharedCommentNodes) {
                        if (scn->parent() == node->parent()) {
                            scn->append(node);
                            found = true;
                            break;
                        }
                    }
                    if (!found) {
                        auto *scn = new SharedCommentNode(node);
                        sharedCommentNodes.append(scn);
                        tied.emplace_back(TiedDocumentation{doc, scn});
                    }
                }
            }
            for (auto *scn : sharedCommentNodes) {
                // Don't sort function nodes - preserve the order from \fn commands
                // for position-dependent \overload primary behavior
                if (!scn->collective().isEmpty() && !scn->collective().first()->isFunction())
                    scn->sort();
            }
        }
    }
    return std::make_pair(tied, errors);
}
 
/*!
  For each node that is part of C++ API and produces a documentation
  page, this function ensures that the node belongs to a module.
 */
static void checkModuleInclusion(Node *n)
{
    if (n->physicalModuleName().isEmpty()) {
        if (n->isInAPI() && !n->name().isEmpty()) {
            switch (n->nodeType()) {
            case NodeType::Class:
            case NodeType::Struct:
            case NodeType::Union:
            case NodeType::Namespace:
            case NodeType::HeaderFile:
                break;
            default:
                return;
            }
            n->setPhysicalModuleName(Generator::defaultModuleName());
            QDocDatabase::qdocDB()->addToModule(Generator::defaultModuleName(), n);
            n->doc().location().warning(
                    QStringLiteral("Documentation for %1 '%2' has no \\inmodule command; "
                                   "using project name by default: %3")
                            .arg(Node::nodeTypeString(n->nodeType()), n->name(),
                                    n->physicalModuleName()));
        }
    }
}
 
void CppCodeParser::processMetaCommands(const std::vector<TiedDocumentation> &tied)
{
    for (auto [doc, node] : tied) {
        node->setDoc(doc);
        processMetaCommands(doc, node);
        checkModuleInclusion(node);
        if (node->isAggregate()) {
            auto *aggregate = static_cast<Aggregate *>(node);
 
            if (!aggregate->includeFile()) {
                const QString className = aggregate->name();
 
                // Resolution priority:
                // 1. Convenience header (if exists in include paths)
                // 2. Include-relative path from declLocation
                // 3. Class name as last resort (only if non-empty)
                QString includeFile = convenienceHeaderExists(className)
                        ? className
                        : computeIncludeSpelling(aggregate->declLocation());
 
                if (includeFile.isEmpty() && !className.isEmpty())
                    includeFile = className;
 
                if (!includeFile.isEmpty())
                    aggregate->setIncludeFile(includeFile);
            }
        }
    }
}
 
void CppCodeParser::processQmlNativeTypeCommand(Node *node, const QString &cmd, const QString &arg, const Location &location)
{
    Q_ASSERT(node);
    if (!node->isQmlNode()) {
        location.warning(
                QStringLiteral("Command '\\%1' is only meaningful in '\\%2'")
                        .arg(cmd, COMMAND_QMLTYPE));
        return;
    }
 
    auto qmlNode = static_cast<QmlTypeNode *>(node);
 
    QDocDatabase *database = QDocDatabase::qdocDB();
    auto classNode = database->findClassNode(arg.split(u"::"_s));
 
    if (!classNode) {
        if (!Config::instance().get(CONFIG_NOLINKERRORS).asBool()) {
            location.warning(
                    QStringLiteral("C++ class %2 not found: \\%1 %2")
                            .arg(cmd, arg));
        }
        return;
    }
 
    if (qmlNode->classNode()) {
        location.warning(
                QStringLiteral("QML type %1 documented with %2 as its native type. Replacing %2 with %3")
                        .arg(qmlNode->name(), qmlNode->classNode()->name(), arg));
    }
 
    qmlNode->setClassNode(classNode);
    classNode->insertQmlNativeType(qmlNode);
    setQmlAttributesFromNativeType(qmlNode, classNode);
}
 
namespace {
 
/*!
    Strips compiler include path prefixes (-I, -isystem, etc.) from a path.
    Returns an empty string if the path is an unrecognized flag.
*/
QString stripIncludePrefix(const QString &path)
{
    QString result = path.trimmed();
 
    static const QStringList prefixes = {
        "-I"_L1, "-isystem"_L1, "-iquote"_L1, "-idirafter"_L1
    };
 
    for (const QString &prefix : prefixes) {
        if (result.startsWith(prefix)) {
            result = result.mid(prefix.size()).trimmed();
            return QDir::cleanPath(result);
        }
    }
 
    // Skip framework paths and other unrecognized flags
    if (result.startsWith(u'-'))
        return {};
 
    return QDir::cleanPath(result);
}
 
} // anonymous namespace
 
/*!
    Returns the cached list of cleaned include paths, combining both
    command-line and qdocconf include paths with prefixes stripped.
*/
const QStringList &CppCodeParser::getCleanIncludePaths() const
{
    if (!m_includePathsCached) {
        // Combine command-line and qdocconf include paths
        QStringList rawPaths = Config::instance().includePaths();
        rawPaths += Config::instance().getCanonicalPathList(
                CONFIG_INCLUDEPATHS, Config::IncludePaths);
 
        for (const QString &path : rawPaths) {
            QString clean = stripIncludePrefix(path);
            if (!clean.isEmpty() && !m_cleanIncludePaths.contains(clean))
                m_cleanIncludePaths.append(clean);
        }
        m_includePathsCached = true;
    }
    return m_cleanIncludePaths;
}
 
/*!
    Checks if a convenience header (extensionless file matching the class name)
    exists in any of the configured include paths. Results are cached.
 
    This supports Qt's convention where classes like QString have convenience
    headers (extensionless files) that redirect to the actual header.
*/
bool CppCodeParser::convenienceHeaderExists(const QString &className) const
{
    if (className.isEmpty())
        return false;
 
    auto it = m_convenienceHeaderCache.constFind(className);
    if (it != m_convenienceHeaderCache.constEnd())
        return *it;
 
    bool exists = false;
    for (const QString &includePath : getCleanIncludePaths()) {
        QFileInfo candidate(includePath + u'/' + className);
        if (candidate.exists() && candidate.isFile()) {
            exists = true;
            break;
        }
    }
 
    m_convenienceHeaderCache.insert(className, exists);
    return exists;
}
 
/*!
    Returns the basename of the header file from the declaration location.
 
    This provides a simple, reliable include spelling that works regardless
    of the working directory or include path configuration. For more complex
    include paths (like subdirectories), users can use \\inheaderfile.
*/
QString CppCodeParser::computeIncludeSpelling(const Location &loc) const
{
    if (loc.isEmpty())
        return {};
 
    return loc.fileName();
}
 
QT_END_NAMESPACE