void skip()

in lang/c++/impl/parsing/Symbol.hh [486:608]
122 lines of code
27 McCabe index (conditional complexity)

    void skip(Decoder &d) {
        const size_t sz = parsingStack.size();
        if (sz == 0) {
            throw Exception("Nothing to skip!");
        }
        while (parsingStack.size() >= sz) {
            Symbol &t = parsingStack.top();
            // std::cout << "skip: " << Symbol::toString(t.kind()) << '\n';
            switch (t.kind()) {
                case Symbol::Kind::Null:
                    d.decodeNull();
                    break;
                case Symbol::Kind::Bool:
                    d.decodeBool();
                    break;
                case Symbol::Kind::Int:
                    d.decodeInt();
                    break;
                case Symbol::Kind::Long:
                    d.decodeLong();
                    break;
                case Symbol::Kind::Float:
                    d.decodeFloat();
                    break;
                case Symbol::Kind::Double:
                    d.decodeDouble();
                    break;
                case Symbol::Kind::String:
                    d.skipString();
                    break;
                case Symbol::Kind::Bytes:
                    d.skipBytes();
                    break;
                case Symbol::Kind::ArrayStart: {
                    parsingStack.pop();
                    size_t n = d.skipArray();
                    processImplicitActions();
                    assertMatch(Symbol::Kind::Repeater, parsingStack.top().kind());
                    if (n == 0) {
                        break;
                    }
                    Symbol &t2 = parsingStack.top();
                    auto *p = t2.extrap<RepeaterInfo>();
                    std::get<0>(*p).push(n);
                    continue;
                }
                case Symbol::Kind::ArrayEnd:
                    break;
                case Symbol::Kind::MapStart: {
                    parsingStack.pop();
                    size_t n = d.skipMap();
                    processImplicitActions();
                    assertMatch(Symbol::Kind::Repeater, parsingStack.top().kind());
                    if (n == 0) {
                        break;
                    }
                    Symbol &t2 = parsingStack.top();
                    auto *p2 = t2.extrap<RepeaterInfo>();
                    std::get<0>(*p2).push(n);
                    continue;
                }
                case Symbol::Kind::MapEnd:
                    break;
                case Symbol::Kind::Fixed: {
                    parsingStack.pop();
                    Symbol &t2 = parsingStack.top();
                    d.decodeFixed(t2.extra<size_t>());
                } break;
                case Symbol::Kind::Enum:
                    parsingStack.pop();
                    d.decodeEnum();
                    break;
                case Symbol::Kind::Union: {
                    parsingStack.pop();
                    size_t n = d.decodeUnionIndex();
                    selectBranch(n);
                    continue;
                }
                case Symbol::Kind::Repeater: {
                    auto *p = t.extrap<RepeaterInfo>();
                    std::stack<ssize_t> &ns = std::get<0>(*p);
                    if (ns.empty()) {
                        throw Exception(
                            "Empty item count stack in repeater skip");
                    }
                    ssize_t &n = ns.top();
                    if (n == 0) {
                        n = std::get<1>(*p) ? d.arrayNext()
                                            : d.mapNext();
                    }
                    if (n != 0) {
                        --n;
                        append(std::get<3>(*p));
                        continue;
                    } else {
                        ns.pop();
                    }
                    break;
                }
                case Symbol::Kind::Indirect: {
                    ProductionPtr pp =
                        t.extra<ProductionPtr>();
                    parsingStack.pop();
                    append(pp);
                }
                    continue;
                case Symbol::Kind::Symbolic: {
                    ProductionPtr pp(
                        t.extra<std::weak_ptr<Production>>());
                    parsingStack.pop();
                    append(pp);
                }
                    continue;
                default: {
                    std::ostringstream oss;
                    oss << "Don't know how to skip "
                        << Symbol::toString(t.kind());
                    throw Exception(oss.str());
                }
            }
            parsingStack.pop();
        }
    }