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use std::collections::HashMap; use std::error::Error; use std::fmt; use unicode_segmentation::UnicodeSegmentation; lazy_static! { static ref CHARACTER_VALUES: HashMap<&'static str, u8> = hashmap! { "🫂" => 200, "💖" => 50, "✨" => 10, "🥺" => 5, "," => 1, "❤️" => 0, }; static ref CHARACTER_VALUES_REVERSED: HashMap<u8, &'static str> = hashmap! { 200 => "🫂" , 50 => "💖", 10 => "✨", 5 => "🥺", 1 => ",", 0 => "❤️", }; } #[derive(Debug)] pub struct TranslationError { pub why: String } impl fmt::Display for TranslationError { fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { write!(f, "{}", self.why) } } impl Error for TranslationError {} pub fn encode_string(input: &dyn AsRef<str>) -> String { input .as_ref() .chars() .map(encode_char) .collect::<String>() } pub fn encode_char(char: char) -> String { let mut buffer = String::new(); let mut value = char as u8; if value == 0 { return CHARACTER_VALUES_REVERSED[&0].to_string(); } loop { let (to_push, subtract_by) = match value { 200..=255 => (CHARACTER_VALUES_REVERSED[&200], 200), 50..=199 => (CHARACTER_VALUES_REVERSED[&50], 50), 10..=49 => (CHARACTER_VALUES_REVERSED[&10], 10), 5..=9 => (CHARACTER_VALUES_REVERSED[&5], 5), 1..=4 => (CHARACTER_VALUES_REVERSED[&1], 1), _ => break }; buffer.push_str(to_push); value -= subtract_by; }; buffer.push_str("👉👈"); buffer } pub fn decode_string(input: &dyn AsRef<str>) -> Result<String, TranslationError> { let r = input.as_ref(); { if r.contains("\u{200B}") { r.trim_end_matches("\u{200B}") .split("\u{200B}") } else { r.trim_end_matches("👉👈") .split("👉👈") } } .map(|c| decode_char(&c)) .collect::<Result<String, _>>() } pub fn decode_char(input: &dyn AsRef<str>) -> Result<char, TranslationError> { let result = input .as_ref() .graphemes(true) .map(|g| { CHARACTER_VALUES .get(g) .ok_or(TranslationError { why: format!("Cannot decode character {}", g) }) }) .collect::<Result<Vec<_>, _>>()? .into_iter() .sum::<u8>(); Ok(result as char) } #[cfg(test)] mod tests { use super::*; #[test] fn test_string_encode() { assert_eq!( encode_string(&"Test"), "💖✨✨✨,,,,👉👈💖💖,👉👈💖💖✨🥺👉👈💖💖✨🥺,👉👈".to_string() ); } #[test] fn test_char_encode() { assert_eq!( encode_char('h'), "💖💖,,,,👉👈".to_string(), ); } #[test] fn test_string_decode() { assert_eq!( decode_string(&"💖✨✨✨,,,,\u{200B}💖💖,\u{200B}💖💖✨🥺\u{200B}💖💖✨🥺,\u{200B}").unwrap(), "Test".to_string() ); } #[test] fn test_char_decode() { assert_eq!( decode_char(&"💖💖,,,,").unwrap(), 'h', ); } }