linkme_impl/
args.rs

1use syn::parse::{Error, Parse, ParseStream, Result};
2use syn::{LitInt, Path, Token};
3
4pub enum Args {
5    None,
6    Path(Path),
7    PathPos(Path, usize),
8}
9
10impl Parse for Args {
11    fn parse(input: ParseStream) -> Result<Self> {
12        if input.is_empty() {
13            return Ok(Args::None);
14        }
15        let path: Path = input.parse()?;
16        if input.is_empty() {
17            return Ok(Args::Path(path));
18        }
19        input.parse::<Token![,]>()?;
20        let lit: LitInt = input.parse()?;
21        let pos: usize = lit.base10_parse()?;
22        if pos > 9999 {
23            return Err(Error::new(lit.span(), "maximum 9999 is supported"));
24        }
25        Ok(Args::PathPos(path, pos))
26    }
27}
linkme_impl/args.rs

linkme_impl/
args.rs
