| use quote::IdentFragment; |
| use std::fmt::{self, Display}; |
| use std::slice::Iter; |
| use syn::parse::{Parse, ParseStream, Result}; |
| use syn::{Ident, Path, Token}; |
| |
| mod kw { |
| syn::custom_keyword!(namespace); |
| } |
| |
| #[derive(Clone)] |
| pub struct Namespace { |
| segments: Vec<Ident>, |
| } |
| |
| impl Namespace { |
| pub fn none() -> Self { |
| Namespace { |
| segments: Vec::new(), |
| } |
| } |
| |
| pub fn iter(&self) -> Iter<Ident> { |
| self.segments.iter() |
| } |
| } |
| |
| impl Parse for Namespace { |
| fn parse(input: ParseStream) -> Result<Self> { |
| let mut segments = Vec::new(); |
| if !input.is_empty() { |
| input.parse::<kw::namespace>()?; |
| input.parse::<Token![=]>()?; |
| let path = input.call(Path::parse_mod_style)?; |
| for segment in path.segments { |
| segments.push(segment.ident); |
| } |
| input.parse::<Option<Token![,]>>()?; |
| } |
| Ok(Namespace { segments }) |
| } |
| } |
| |
| impl Display for Namespace { |
| fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { |
| for segment in self { |
| write!(f, "{}$", segment)?; |
| } |
| Ok(()) |
| } |
| } |
| |
| impl IdentFragment for Namespace { |
| fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { |
| Display::fmt(self, f) |
| } |
| } |
| |
| impl<'a> IntoIterator for &'a Namespace { |
| type Item = &'a Ident; |
| type IntoIter = Iter<'a, Ident>; |
| fn into_iter(self) -> Self::IntoIter { |
| self.iter() |
| } |
| } |