v/vlib/rand/rand.js.v

61 lines
1.1 KiB
V
Raw Normal View History

module rand
// init initializes the default RNG.
fn init() {
default_rng = new_default()
}
fn internal_string_from_set(mut rng PRNG, charset string, len int) string {
result := ''
#
#const characters = charset.str;
#const charactersLength = characters.length;
#for (let i = 0;i < len.val;i++)
#result.str += characters.charAt(Math.random() * charactersLength);
return result
}
const (
ulid_encoding = '0123456789ABCDEFGHJKMNPQRSTVWXYZ'
)
fn internal_ulid_at_millisecond(mut rng PRNG, unix_time_milli u64) string {
2022-04-15 14:35:35 +02:00
mut buf := []u8{cap: 27}
mut t := unix_time_milli
mut i := 9
for i >= 0 {
buf[i] = rand.ulid_encoding[int(t & 0x1f)]
t = t >> 5
i--
}
mut x := rng.u64()
i = 10
for i < 19 {
buf[i] = rand.ulid_encoding[int(x & 0x1f)]
x = x >> 5
i++
}
x = rng.u64()
for i < 26 {
buf[i] = rand.ulid_encoding[int(x & 0x1f)]
x = x >> 5
i++
}
res := ''
println(buf)
#res.str = buf.arr.arr.map(String.fromCharCode).join('')
return res
}
2022-04-15 14:35:35 +02:00
fn read_internal(mut rng PRNG, mut buf []u8) {
for i in 0 .. buf.len {
2022-04-15 13:58:56 +02:00
buf[i] = rng.u8()
}
}