aac3e00f8d
This makes lettre behave like the rest of the libraries, where the `serde` feature enables serde support
49 lines
1.2 KiB
Rust
49 lines
1.2 KiB
Rust
//! Utils for string manipulation
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use std::fmt::{Display, Formatter, Result as FmtResult};
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/// Encode a string as xtext
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#[derive(Debug)]
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#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
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pub struct XText<'a>(pub &'a str);
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impl<'a> Display for XText<'a> {
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fn fmt(&self, f: &mut Formatter) -> FmtResult {
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let mut rest = self.0;
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while let Some(idx) = rest.find(|c| c < '!' || c == '+' || c == '=') {
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let (start, end) = rest.split_at(idx);
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f.write_str(start)?;
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let mut end_iter = end.char_indices();
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let (_, c) = end_iter.next().expect("char");
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write!(f, "+{:X}", c as u8)?;
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if let Some((idx, _)) = end_iter.next() {
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rest = &end[idx..];
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} else {
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rest = "";
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}
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}
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f.write_str(rest)
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}
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}
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#[cfg(test)]
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mod tests {
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use super::XText;
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#[test]
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fn test() {
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for (input, expect) in [
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("bjorn", "bjorn"),
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("bjørn", "bjørn"),
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("Ø+= ❤️‰", "Ø+2B+3D+20❤️‰"),
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("+", "+2B"),
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]
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.iter()
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{
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assert_eq!(format!("{}", XText(input)), expect.to_string());
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}
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}
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}
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