Function FormatCompactIntervalRange

library/cpp/yt/string/format-inl.h:244–276

template <class TRange, class TValueGetter, class TIntervalFormatter>
void FormatCompactIntervalRange(
    TStringBuilderBase* builder,
    const TRange& range,
    const TValueGetter& valueGetter,
    const TIntervalFormatter& intervalFormatter)
{
    if (range.begin() == range.end()) {
        builder->AppendString("[]");
        return;
    }

    builder->AppendChar('[');

    auto first = range.begin();
    auto last = first;
    auto current = std::next(first);

    while (current != range.end()) {
        if (valueGetter(current) != valueGetter(last) + 1) {
            bool firstInterval = first == range.begin();
            intervalFormatter(builder, first, last, valueGetter, firstInterval);
            first = current;
        }

        last = current;
        ++current;
    }

    bool firstInterval = first == range.begin();
    intervalFormatter(builder, first, last, valueGetter, firstInterval);

    builder->AppendChar(']');
}

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