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symbolmacro::make_symbols!();
pub trait PrettyUnicode {
type Owned: core::borrow::Borrow<Self>;
fn to_pretty_unicode(&self) -> Option<Self::Owned>;
}
impl PrettyUnicode for str {
type Owned = String;
fn to_pretty_unicode(&self) -> Option<Self::Owned> {
// split at escape sequences
let mut chunks = self.split("\\<");
// first chunk contains no escape
let prefix = chunks.next()?;
// line with escape sequences replaced by unicode
let mut pretty = chunks
.filter_map(|chunk| {
// extract this symbol's name
let ident : Option<&str> = chunk
.split(">")
.next();
// get this symbol's unicode representation
let symbol : char = ident
.map(symbol)
.flatten()
.unwrap_or('�');
// how much of the rest do we need?
let offset = ident?
.len()
+ 1;
Some((symbol, &chunk[offset..]))
})
.fold(prefix.to_owned(), |mut acc, (symbol, rest)| {
// TODO: this may cause some unnecessary reallocs
// (since the line length is known in advance)
acc.push(symbol);
acc.push_str(rest);
// lol rust is sufficiently imperative to have mutable
// strings but also sufficiently functional that this
// version of fold pretends like it doesn't
acc
});
// add a newline
pretty.push('\n');
Some(pretty)
}
}
|
