Function sam3_codepoint_to_utf8

sam3.cpp:1108–1126

}

static std::string sam3_codepoint_to_utf8(int cp) {
    std::string s;
    if (cp < 0x80) {
        s += (char)cp;
    } else if (cp < 0x800) {
        s += (char)(0xC0 | (cp >> 6));
        s += (char)(0x80 | (cp & 0x3F));
    } else if (cp < 0x10000) {
        s += (char)(0xE0 | (cp >> 12));
        s += (char)(0x80 | ((cp >> 6) & 0x3F));
        s += (char)(0x80 | (cp & 0x3F));
    } else {
        s += (char)(0xF0 | (cp >> 18));
        s += (char)(0x80 | ((cp >> 12) & 0x3F));
        s += (char)(0x80 | ((cp >> 6) & 0x3F));
        s += (char)(0x80 | (cp & 0x3F));
    }
    return s;
}

// Check if position i in s starts a Unicode letter.
// Handles ASCII letters + treats any multibyte UTF-8 start byte as a letter.