nanoid_wasm/
lib.rs

1#[cfg(target_family = "wasm")]
2mod wasm {
3    use wasm_bindgen::prelude::*;
4
5    pub fn get_nanoid_with_chars(size: usize, chars: &[char]) -> String {
6        let chars_len = chars.len();
7        let mut buf: Vec<u8> = vec![0u8; size];
8        let crypto = web_sys::window().unwrap_throw().crypto().unwrap_throw();
9        crypto
10            .get_random_values_with_u8_array(&mut buf)
11            .unwrap_throw();
12        buf.into_iter()
13            .map(|i| chars[(i as usize) % chars_len])
14            .collect::<String>()
15    }
16}
17
18#[cfg(not(target_family = "wasm"))]
19mod not_wasm {
20
21    pub fn get_nanoid_with_chars(size: usize, chars: &[char]) -> String {
22        let chars_len = chars.len();
23        (0..size)
24            .map(|_| chars[rand::random_range(..chars_len)])
25            .collect::<String>()
26    }
27}
28
29/// # Example
30/// ```rust, no_run
31/// use nanoid_wasm::get_nanoid_with_chars;
32///
33/// let id = nanoid_wasm::get_nanoid_with_chars(21, &['a', 'b', 'c', 'd']);
34/// println!("{}", id); // some random id with 21 characters among ['a', 'b', 'c', 'd']
35/// ```
36pub fn get_nanoid_with_chars(size: usize, chars: &[char]) -> String {
37    #[cfg(target_family = "wasm")]
38    return wasm::get_nanoid_with_chars(size, chars);
39
40    #[cfg(not(target_family = "wasm"))]
41    return not_wasm::get_nanoid_with_chars(size, chars);
42}
43
44/// # Example
45/// ```rust, no_run
46/// use nanoid_wasm::get_nanoid;
47///
48/// let id = nanoid_wasm::get_nanoid(21);
49/// println!("{}", id); // some random id with 21 characters;
50/// ```
51pub fn get_nanoid(size: usize) -> String {
52    let chars: [char; 64] = [
53        '_', '-', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f',
54        'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x',
55        'y', 'z', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P',
56        'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z',
57    ];
58
59    get_nanoid_with_chars(size, &chars)
60}
61
62/// # Example
63///
64/// ```rust
65/// use nanoid_wasm::nanoid;
66///
67/// let size = 21;
68/// let id: String = nanoid!(); // 21 characters
69/// assert_eq!(id.len(), 21);
70/// println!("{}", id); // some random id with 21 characters;
71///
72/// let id: String = nanoid!(8); // 8 characters
73/// assert_eq!(id.len(), 8);
74/// println!("{}", id);
75///
76/// let chars = ['a', 'b', 'c', 'd'];
77/// let id = nanoid!(5, &chars); // 5 characters among ['a', 'b', 'c', 'd']
78/// assert_eq!(id.len(), 5);
79/// assert!(id.chars().all(|c| chars.contains(&c)));
80/// println!("{}", id);
81/// ```
82#[macro_export]
83macro_rules! nanoid {
84    () => {
85        nanoid_wasm::get_nanoid(21)
86    };
87    ($size:expr) => {
88        nanoid_wasm::get_nanoid($size)
89    };
90    ($size:expr, $chars:expr) => {
91        nanoid_wasm::get_nanoid_with_chars($size, $chars)
92    };
93}
nanoid_wasm/lib.rs

nanoid_wasm/
lib.rs
