base256emoji/
lib.rs

1#![cfg_attr(not(test), no_std)]
2
3use core::fmt;
4extern crate alloc;
5use alloc::{vec, vec::Vec, string::String};
6
7#[derive(Debug, Clone)]
8pub struct DecodeError {
9	codepoint: char,
10	index: usize,
11}
12
13impl fmt::Display for DecodeError {
14	fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
15		write!(
16			f,
17			"{} at index {} is not part of the alphabet",
18			self.codepoint, self.index
19		)
20	}
21}
22
23pub type Alphabet = [char; 256];
24
25pub trait Base {
26	const ALPHABET: Alphabet;
27
28	fn get_index(c: char) -> Option<u8>;
29
30	fn decode(input: &str) -> Result<Vec<u8>, DecodeError> {
31		let s = input.chars().count();
32		let mut output = vec![0; s];
33		for (i, c) in input.chars().enumerate() {
34			output[i] = Self::get_index(c).ok_or(DecodeError {
35				codepoint: c,
36				index: i,
37			})?;
38		}
39
40		Ok(output)
41	}
42
43	fn encode(input: &[u8]) -> String {
44		let s = input
45			.iter()
46			.map(|&x| Self::ALPHABET[x as usize].len_utf8())
47			.sum();
48		let mut output: Vec<u8> = vec![0; s];
49		let mut i = 0;
50		for &v in input.iter() {
51			let c = Self::ALPHABET[v as usize];
52			c.encode_utf8(&mut output[i..]);
53			i += c.len_utf8();
54		}
55
56		String::from_utf8(output).unwrap()
57	}
58}
59
60#[derive(Debug, Default)]
61pub struct Emoji;
62
63macro_rules! gen_alphabet {
64	($name:ident, $alphabet:literal) => {
65		impl Base for $name {
66			const ALPHABET: Alphabet = const_str::to_char_array!($alphabet);
67
68			fn get_index(c: char) -> Option<u8> {
69				match_lookup::gen_char_match!(c, $alphabet).map(|c| c as u8)
70			}
71		}
72	};
73}
74
75gen_alphabet!(Emoji, "🚀🪐☄🛰🌌🌑🌒🌓🌔🌕🌖🌗🌘🌍🌏🌎🐉☀💻🖥💾💿😂❤😍🤣😊🙏💕😭😘👍😅👏😁🔥🥰💔💖💙😢🤔😆🙄💪😉☺👌🤗💜😔😎😇🌹🤦🎉💞✌✨🤷😱😌🌸🙌😋💗💚😏💛🙂💓🤩😄😀🖤😃💯🙈👇🎶😒🤭❣😜💋👀😪😑💥🙋😞😩😡🤪👊🥳😥🤤👉💃😳✋😚😝😴🌟😬🙃🍀🌷😻😓⭐✅🥺🌈😈🤘💦✔😣🏃💐☹🎊💘😠☝😕🌺🎂🌻😐🖕💝🙊😹🗣💫💀👑🎵🤞😛🔴😤🌼😫⚽🤙☕🏆🤫👈😮🙆🍻🍃🐶💁😲🌿🧡🎁⚡🌞🎈❌✊👋😰🤨😶🤝🚶💰🍓💢🤟🙁🚨💨🤬✈🎀🍺🤓😙💟🌱😖👶🥴▶➡❓💎💸⬇😨🌚🦋😷🕺⚠🙅😟😵👎🤲🤠🤧📌🔵💅🧐🐾🍒😗🤑🌊🤯🐷☎💧😯💆👆🎤🙇🍑❄🌴💣🐸💌📍🥀🤢👅💡💩👐📸👻🤐🤮🎼🥵🚩🍎🍊👼💍📣🥂");
76
77#[cfg(test)]
78mod tests {
79	use crate::{Base, Emoji};
80
81	extern crate alloc;
82	use alloc::vec;
83
84	#[test]
85	fn byte1_rt() {
86		let mut org = vec![0u8; 1];
87		for i in 0..255 {
88			org[0] = i;
89			let e = Emoji::encode(&org);
90			let r = match Emoji::decode(e.as_str()) {
91				Ok(x) => x,
92				Err(e) => {
93					panic!("{}", e);
94				}
95			};
96			assert_eq!(org, r)
97		}
98	}
99
100	#[test]
101	fn index() {
102		for (i, &c) in Emoji::ALPHABET.iter().enumerate() {
103			println!("i{}:{}, {:?}", i, c, Emoji::get_index(c));
104			assert!(i as u8 == Emoji::get_index(c).unwrap());
105		}
106	}
107
108	#[test]
109	fn juan() {
110		let hi = "hi juan!";
111		let encoded = Emoji::encode(&hi.as_bytes().to_owned());
112		assert_eq!("😴🌟😅😬🤘🤤😻👏", encoded);
113		println!("{}: {}", hi, encoded);
114	}
115
116	#[test]
117	fn reference() {
118		let hi = "yes mani !";
119		let encoded = Emoji::encode(&hi.as_bytes().to_owned());
120		assert_eq!("🏃✋🌈😅🌷🤤😻🌟😅👏", encoded);
121		println!("{}: {}", hi, encoded);
122	}
123}
base256emoji/lib.rs

base256emoji/
lib.rs
