Function GetTypeNameAsParameter

InsightsHelpers.cpp:1298–1391

//-----------------------------------------------------------------------------

std::string GetTypeNameAsParameter(const QualType& t, std::string_view varName, const Unqualified unqualified)
{
    const bool isFunctionPointer =
        HasTypeWithSubType<ReferenceType, FunctionProtoType>(t.getCanonicalType()) or
        HasTypeWithSubType<ReferenceType, PointerType, FunctionProtoType>(t.getCanonicalType());
    const bool isArrayRef = HasTypeWithSubType<ReferenceType, ArrayType>(t);
    // Special case for Issue81, auto returns an array-ref and to catch auto deducing an array (Issue106)
    const bool isAutoType             = (nullptr != dyn_cast_or_null<AutoType>(t.getTypePtrOrNull()));
    const auto pointerToArrayBaseType = isAutoType ? t->getContainedAutoType()->getDeducedType() : t;
    const bool isPointerToArray       = HasTypeWithSubType<PointerType, ArrayType>(pointerToArrayBaseType);
    // Only treat this as an array if it is a top-level arry. Typdef's et all can hide the arrayness.
    const bool isRawArrayType =
        t->isArrayType() and not(isa<TypedefType>(t) or isa<ElaboratedType>(t) or isa<UsingType>(t));

    std::string typeName = details::GetName(t, unqualified);

    // Sometimes we get char const[2]. If we directly insert the typename we end up with char const__var[2] which is not
    // a valid type name. Hence check for this condition and, if necessary, insert a space before __var.
    auto getSpaceOrEmpty = [&](const std::string_view& needle) -> std::string_view {
        if(not Contains(typeName, needle)) {
            return " ";
        }

        return {};
    };

    if(isRawArrayType and not t->isLValueReferenceType()) {
        const auto space = getSpaceOrEmpty(" ["sv);
        InsertBefore(typeName, "["sv, StrCat(space, varName));

    } else if(isArrayRef) {
        const bool             isRValueRef{HasTypeWithSubType<RValueReferenceType, ArrayType>(t)};
        const std::string_view contains{isRValueRef ? "(&&" : "(&"};

        if(Contains(typeName, contains)) {
            InsertAfter(typeName, contains, varName);
        } else {
            const std::string_view insertBefore{isRValueRef ? "&&[" : "&["};

            InsertBefore(typeName, insertBefore, "("sv);

            // check whether we are dealing with a function or an array
            if(Contains(typeName, contains)) {
                InsertAfter(typeName, contains, StrCat(varName, ")"sv));
            } else {
                InsertAfter(typeName, typeName, StrCat(" "sv, varName));
            }
        }

    } else if(isFunctionPointer) {
        const bool isRValueRef{HasTypeWithSubType<RValueReferenceType, FunctionProtoType>(t)};
        const auto contains{[&]() {
            if(isRValueRef) {
                return "(&&"sv;
            }

            else if(HasTypeWithSubType<LValueReferenceType, PointerType, FunctionProtoType>(t)) {
                return "(*&"sv;