Function unicode_tolower

src/unicode.cpp:1039–1049

}

uint32_t unicode_tolower(uint32_t cpt) {
    // binary search
    auto it = std::lower_bound(unicode_map_lowercase.begin(), unicode_map_lowercase.end(), cpt,
        [](const std::pair<uint32_t, uint32_t> & pair, uint32_t value) {
            return pair.first < value;
        });
    if (it != unicode_map_lowercase.end() && it->first == cpt) {
        return it->second;
    }
    return cpt;  // Return the original code point if no lowercase mapping is found
}

bool unicode_cpt_is_han(uint32_t cpt) {
    // Han character ranges (Chinese/CJK characters)