tmd unserializer code

bool TMDTextUnserializer::Unserialize(StringView str)
{
    Array<size_t> indexStack;
    auto FixupEntries = [this,&indexStack](int level)
    {
        size_t end = _entries.size();
        while (indexStack.size() > size_t(level + 1))
        {
            _entries[indexStack.last()].off2next = end - indexStack.last();
            indexStack.pop_back();
        }
    };

    _entries.clear();
    _data = str;
    str = _data;

    int prevLevel = -1;
    while (str.not_empty())
    {
        StringView line = str.until("\n");
        str.skip(line.size() + 1);

        // detect level
        int level = 0;
        while (line.ch() == ' ' || line.ch() == '\t')
        {
            line.skip(1);
            level++;
        }

        // whitespace only, skip line
        if (line.empty())
            continue;

        if (level > prevLevel + 1)
        {
            LOG_WARNING << "TMDTextUnserializer failed: missing entries/excessive indenting";
            return false;
        }
        if (level == prevLevel + 1)
        {
            indexStack.push_back(_entries.size());
        }
        else
        {
            if (level < prevLevel)
                FixupEntries(level);
            _entries[indexStack[level]].off2next = _entries.size() - indexStack[level];
            indexStack[level] = _entries.size();
        }
        prevLevel = level;

        StringView nametype = line.until("=");
        StringView value = line.part(nametype.size() + 1);
        StringView name = nametype.until(":");
        StringView type = nametype.part(name.size() + 1);

        name.trim(SPACE_CHARS);
        type.trim(SPACE_CHARS);
        value.trim(SPACE_CHARS);

        _entries.push_back({ level, 0, name, type, value });
    }
    FixupEntries(-1);

    return true;
}