Method construct

src/ifcparse/IfcFile.cpp:237–340

}

IfcEntityInstanceData IfcParse::parse_context::construct(boost::optional<size_t> name, unresolved_references& references_to_resolve, const IfcParse::declaration* decl, boost::optional<size_t> expected_size, int resolve_reference_index, bool coerce_attribute_count) {
    std::vector<const IfcParse::parameter_type*> parameter_types;
    std::unique_ptr<IfcParse::named_type> transient_named_type;

    if ((decl != nullptr) && (decl->as_type_declaration() != nullptr)) {
        parameter_types = { decl->as_type_declaration()->declared_type() };
    } else if ((decl != nullptr) && (decl->as_enumeration_type() != nullptr)) {
        transient_named_type.reset(new IfcParse::named_type(const_cast<IfcParse::declaration*>(decl)));
        parameter_types = { &*transient_named_type };
    } else if ((decl != nullptr) && (decl->as_entity() != nullptr)) {
        auto entity_attrs = decl->as_entity()->all_attributes();
        std::transform(
            entity_attrs.begin(),
            entity_attrs.end(),
            std::back_inserter(parameter_types),
            [](auto* attr) {
                return attr->type_of_attribute();
            }
        );
    }

    if (((decl != nullptr) && (tokens_.size() != parameter_types.size())) ||
        expected_size && *expected_size != tokens_.size())
    {
        size_t expected = expected_size ? *expected_size : parameter_types.size();
        if (decl != nullptr && decl->schema() == &Header_section_schema::get_schema()) {
            Logger::Warning("Expected " + std::to_string(expected) + " attribute values, found " + std::to_string(tokens_.size()) + " for header entity " + decl->name());
        } else {
            Logger::Warning("Expected " + std::to_string(expected) + " attribute values, found " + std::to_string(tokens_.size()) + (name ? std::string(" for instance #" + std::to_string(*name)) : std::string("")));
        }
    }

    if (tokens_.empty()) {
        return IfcEntityInstanceData(in_memory_attribute_storage(0));
    }

    in_memory_attribute_storage storage(coerce_attribute_count
        ? (decl != nullptr
        ? (std::min)(parameter_types.size(), tokens_.size())
        : tokens_.size())
		: tokens_.size()
    );

    auto it = tokens_.begin();
    auto kt = parameter_types.begin();
    for (; it != tokens_.end() && ((decl == nullptr) || kt != parameter_types.end()); ++it) {
        auto& token = *it;
        // @todo coerce to expected type, e.g empty -> std::vector<int>, bool -> logical
        const IfcParse::parameter_type* param_type = nullptr;
        if (decl != nullptr) {
            param_type = *kt;
        }

        auto index = (uint8_t) std::distance(tokens_.begin(), it);

        std::visit([this, &storage, name, &references_to_resolve, index, param_type, resolve_reference_index](const auto& v) {
            if constexpr (std::is_same_v<std::decay_t<decltype(v)>, IfcParse::Token>) {
                dispatch_token(name, index, v, param_type && param_type->as_named_type() ? param_type->as_named_type()->declared_type() : nullptr, [this, &storage, name, &references_to_resolve, index, resolve_reference_index](auto v) {