1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
use core::char;
pub const S_BASE: u32 = 0xAC00;
pub const L_BASE: u32 = 0x1100;
pub const V_BASE: u32 = 0x1161;
pub const T_BASE: u32 = 0x11A7;
pub const L_COUNT: u32 = 19;
pub const V_COUNT: u32 = 21;
pub const T_COUNT: u32 = 28;
pub const N_COUNT: u32 = (V_COUNT * T_COUNT);
pub const S_COUNT: u32 = (L_COUNT * N_COUNT);
pub fn is_syllable(ch: char) -> bool {
let cp = ch as u32;
cp >= S_BASE && cp < (S_BASE + S_COUNT)
}
#[allow(unsafe_code)]
#[inline]
pub fn decompose_syllable<F>(syllable: char, f: &mut F)
where
F: FnMut(char),
{
let si = syllable as u32 - S_BASE;
let li = si / N_COUNT;
unsafe {
(*f)(char::from_u32_unchecked(L_BASE + li));
let vi = (si % N_COUNT) / T_COUNT;
(*f)(char::from_u32_unchecked(V_BASE + vi));
let ti = si % T_COUNT;
if ti > 0 {
(*f)(char::from_u32_unchecked(T_BASE + ti));
}
}
}
#[allow(unsafe_code)]
#[inline]
pub fn compose_syllable(jamo1: char, jamo2: char) -> Option<char> {
let l = jamo1 as u32;
let v = jamo2 as u32;
if L_BASE <= l && l < (L_BASE + L_COUNT)
&& V_BASE <= v && v < (V_BASE + V_COUNT)
{
let r = S_BASE + (l - L_BASE) * N_COUNT + (v - V_BASE) * T_COUNT;
return unsafe { Some(char::from_u32_unchecked(r)) };
}
if S_BASE <= l && l <= (S_BASE+S_COUNT-T_COUNT)
&& T_BASE <= v && v < (T_BASE+T_COUNT)
&& (l - S_BASE) % T_COUNT == 0
{
let r = l + (v - T_BASE);
return unsafe { Some(char::from_u32_unchecked(r)) };
}
None
}