unicode_joining_type/
joining_type.rs

1include!(concat!(env!("OUT_DIR"), "/joining_type.rs")); // generated by build.rs
2
3const MASK: usize = BLOCK_SIZE - 1;
4const SHIFT: usize = MASK.count_ones() as usize;
5
6/// Look up the joining type for a character.
7///
8/// ### Example
9///
10/// ```
11/// use unicode_joining_type::{get_joining_type, JoiningType};
12///
13/// assert_eq!(get_joining_type('ھ'), JoiningType::DualJoining);
14/// ```
15pub fn get_joining_type(chr: char) -> JoiningType {
16    let u = chr as u32;
17
18    if u <= LAST_CODEPOINT {
19        JOINING_TYPE_BLOCKS
20            [JOINING_TYPE_BLOCK_OFFSETS[u as usize >> SHIFT] as usize + (u as usize & MASK)]
21    } else {
22        NonJoining
23    }
24}