use syn::{
Ident, Path, PathArguments, PathSegment, Token,
ext::IdentExt as _,
parse::{ParseStream, Result},
punctuated::Punctuated,
};
fn parse_path_segment(input: ParseStream<'_>) -> Result<PathSegment> {
if input.peek(Token![super]) || input.peek(Token![self]) || input.peek(Token![crate]) {
let ident = input.call(Ident::parse_any)?;
return Ok(PathSegment::from(ident));
}
let ident =
if input.peek(Token![Self]) { input.call(Ident::parse_any)? } else { input.parse()? };
if input.peek(Token![::]) && input.peek3(Token![<]) {
Ok(PathSegment { ident, arguments: PathArguments::AngleBracketed(input.parse()?) })
} else {
Ok(PathSegment::from(ident))
}
}
pub(crate) fn parse_path(input: ParseStream<'_>) -> Result<Path> {
Ok(Path {
leading_colon: input.parse()?,
segments: {
let mut segments = Punctuated::new();
let value = parse_path_segment(input)?;
segments.push_value(value);
while input.peek(Token![::]) {
let punct: Token![::] = input.parse()?;
segments.push_punct(punct);
let value = parse_path_segment(input)?;
segments.push_value(value);
}
segments
},
})
}