static BOOL re_need_check_advance()

in src/couch_quickjs/quickjs/libregexp.c [878:928]

• 48 lines of code
• 21 McCabe index (conditional complexity)

static BOOL re_need_check_advance(const uint8_t *bc_buf, int bc_buf_len)
{
    int pos, opcode, len;
    uint32_t val;
    BOOL ret;

    ret = TRUE;
    pos = 0;
    while (pos < bc_buf_len) {
        opcode = bc_buf[pos];
        len = reopcode_info[opcode].size;
        switch(opcode) {
        case REOP_range:
            val = get_u16(bc_buf + pos + 1);
            len += val * 4;
            goto simple_char;
        case REOP_range32:
            val = get_u16(bc_buf + pos + 1);
            len += val * 8;
            goto simple_char;
        case REOP_char:
        case REOP_char32:
        case REOP_dot:
        case REOP_any:
        simple_char:
            ret = FALSE;
            break;
        case REOP_line_start:
        case REOP_line_end:
        case REOP_push_i32:
        case REOP_push_char_pos:
        case REOP_drop:
        case REOP_word_boundary:
        case REOP_not_word_boundary:
        case REOP_prev:
            /* no effect */
            break;
        case REOP_save_start:
        case REOP_save_end:
        case REOP_save_reset:
        case REOP_back_reference:
        case REOP_backward_back_reference:
            break;
        default:
            /* safe behavior: we cannot predict the outcome */
            return TRUE;
        }
        pos += len;
    }
    return ret;
}