static int lre_case_conv_entry()

in src/couch_quickjs/quickjs/libunicode.c [59:149]

• 89 lines of code
• 30 McCabe index (conditional complexity)

static int lre_case_conv_entry(uint32_t *res, uint32_t c, int conv_type, uint32_t idx, uint32_t v)
{
    uint32_t code, data, type, a, is_lower;
    is_lower = (conv_type != 0);
    type = (v >> (32 - 17 - 7 - 4)) & 0xf;
    data = ((v & 0xf) << 8) | case_conv_table2[idx];
    code = v >> (32 - 17);
    switch(type) {
    case RUN_TYPE_U:
    case RUN_TYPE_L:
    case RUN_TYPE_UF:
    case RUN_TYPE_LF:
        if (conv_type == (type & 1) ||
            (type >= RUN_TYPE_UF && conv_type == 2)) {
            c = c - code + (case_conv_table1[data] >> (32 - 17));
        }
        break;
    case RUN_TYPE_UL:
        a = c - code;
        if ((a & 1) != (1 - is_lower))
            break;
        c = (a ^ 1) + code;
        break;
    case RUN_TYPE_LSU:
        a = c - code;
        if (a == 1) {
            c += 2 * is_lower - 1;
        } else if (a == (1 - is_lower) * 2) {
            c += (2 * is_lower - 1) * 2;
        }
        break;
    case RUN_TYPE_U2L_399_EXT2:
        if (!is_lower) {
            res[0] = c - code + case_conv_ext[data >> 6];
            res[1] = 0x399;
            return 2;
        } else {
            c = c - code + case_conv_ext[data & 0x3f];
        }
        break;
    case RUN_TYPE_UF_D20:
        if (conv_type == 1)
            break;
        c = data + (conv_type == 2) * 0x20;
        break;
    case RUN_TYPE_UF_D1_EXT:
        if (conv_type == 1)
            break;
        c = case_conv_ext[data] + (conv_type == 2);
        break;
    case RUN_TYPE_U_EXT:
    case RUN_TYPE_LF_EXT:
        if (is_lower != (type - RUN_TYPE_U_EXT))
            break;
        c = case_conv_ext[data];
        break;
    case RUN_TYPE_LF_EXT2:
        if (!is_lower)
            break;
        res[0] = c - code + case_conv_ext[data >> 6];
        res[1] = case_conv_ext[data & 0x3f];
        return 2;
    case RUN_TYPE_UF_EXT2:
        if (conv_type == 1)
            break;
        res[0] = c - code + case_conv_ext[data >> 6];
        res[1] = case_conv_ext[data & 0x3f];
        if (conv_type == 2) {
            /* convert to lower */
            res[0] = lre_case_conv1(res[0], 1);
            res[1] = lre_case_conv1(res[1], 1);
        }
        return 2;
    default:
    case RUN_TYPE_UF_EXT3:
        if (conv_type == 1)
            break;
        res[0] = case_conv_ext[data >> 8];
        res[1] = case_conv_ext[(data >> 4) & 0xf];
        res[2] = case_conv_ext[data & 0xf];
        if (conv_type == 2) {
            /* convert to lower */
            res[0] = lre_case_conv1(res[0], 1);
            res[1] = lre_case_conv1(res[1], 1);
            res[2] = lre_case_conv1(res[2], 1);
        }
        return 3;
    }
    res[0] = c;
    return 1;
}