You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
42 lines
1.3 KiB
42 lines
1.3 KiB
use syn::ext::IdentExt;
|
|
use syn::parse::{ParseStream, Result};
|
|
use syn::{Ident, LitStr, Token};
|
|
|
|
pub struct QualifiedName {
|
|
pub segments: Vec<Ident>,
|
|
}
|
|
|
|
impl QualifiedName {
|
|
pub fn parse_unquoted(input: ParseStream) -> Result<Self> {
|
|
let mut segments = Vec::new();
|
|
let mut trailing_punct = true;
|
|
let leading_colons: Option<Token![::]> = input.parse()?;
|
|
while trailing_punct && input.peek(Ident::peek_any) {
|
|
let ident = Ident::parse_any(input)?;
|
|
segments.push(ident);
|
|
let colons: Option<Token![::]> = input.parse()?;
|
|
trailing_punct = colons.is_some();
|
|
}
|
|
if segments.is_empty() && leading_colons.is_none() {
|
|
return Err(input.error("expected path"));
|
|
} else if trailing_punct {
|
|
return Err(input.error("expected path segment"));
|
|
}
|
|
Ok(QualifiedName { segments })
|
|
}
|
|
|
|
pub fn parse_quoted_or_unquoted(input: ParseStream) -> Result<Self> {
|
|
if input.peek(LitStr) {
|
|
let lit: LitStr = input.parse()?;
|
|
if lit.value().is_empty() {
|
|
let segments = Vec::new();
|
|
Ok(QualifiedName { segments })
|
|
} else {
|
|
lit.parse_with(Self::parse_unquoted)
|
|
}
|
|
} else {
|
|
Self::parse_unquoted(input)
|
|
}
|
|
}
|
|
}
|