Function start_element

src/ifcparse/parse_ifcxml.cpp:373–689

}

static void start_element(void* user, const xmlChar* tag, const xmlChar** attrs) {
    ifcxml_parse_state* state = (ifcxml_parse_state*)user;
    std::string tagname = (char*)tag;

#ifndef NDEBUG
    std::cout << "stack:" << std::endl;
    {
        int i = 1;
        for (auto& node : state->stack) {
            std::cout << "  " << (i++) << ":" << node.repr() << std::endl;
        }
    }
    std::cout << std::string(state->stack.size(), ' ') << "<" << tagname << ">";
#endif

    std::vector<std::pair<std::string, std::string>> attributes;

    if (attrs != nullptr) {
        std::string attrname;
        int i = 0;
        while (attrs[i] != NULL) {
            if ((i % 2) != 0) {
                const std::string value = (char*)attrs[i];
#ifndef NDEBUG
                std::cout << " " << attrname << "='" << value << "'";
#endif
                attributes.push_back(std::make_pair(attrname, value));

                if ((tagname == "ifc:ifcXML" || tagname == "ifcXML") && attrname == "xsi:schemaLocation" &&
                    (boost::starts_with(value, "http://www.buildingsmart-tech.org/ifcXML/IFC4") ||
                     boost::starts_with(value, "http://www.buildingsmart-tech.org/ifc/IFC4"))) {
                    // We're expecting a schemaLocation like "http://www.buildingsmart-tech.org/ifcXML/IFC4/Add2 IFC4_ADD2_TC1.xsd"
                    // With token compression this is split into:
                    // [0] http:
                    // [1] www.buildingsmart-tech.org
                    // [2] ifcXML
                    // [3] IFC4
                    // [4] Add2
                    // [5] IFC4_ADD2_TC1.xsd
                    // The hosstname will likely change though.
                    auto it = boost::algorithm::make_split_iterator(value, boost::algorithm::token_finder(boost::algorithm::is_any_of("/ "), boost::algorithm::token_compress_on));
                    decltype(it) end;
                    for (int tok = 0; it != end && tok < 3; ++it, ++tok) {
                    }
                    if (it != end) {
                        std::string schema_name(&it->front(), it->size());
                        boost::to_upper(schema_name);
                        state->file = new IfcParse::IfcFile(IfcParse::schema_by_name(schema_name));
                        state->dialect = ifcxml_dialect_ifc4;
                    }
                    goto end;
                } else if (tagname == "ex:iso_10303_28" && attrname == "xsi:schemaLocation" && boost::starts_with(value, "http://www.iai-tech.org/ifcXML/IFC2x3")) {
                    state->file = new IfcParse::IfcFile(IfcParse::schema_by_name("IFC2X3"));
                    state->dialect = ifcxml_dialect_ifc2x3;
                    goto end;
                }
            } else {
                attrname = (char*)attrs[i];