| use crate::syntax::qualified::QualifiedName; |
| use quote::IdentFragment; |
| use std::fmt::{self, Display}; |
| use std::slice::Iter; |
| use syn::parse::{Error, Parse, ParseStream, Result}; |
| use syn::{Expr, Ident, Lit, Meta, Token}; |
| |
| mod kw { |
| syn::custom_keyword!(namespace); |
| } |
| |
| #[derive(Clone, Default)] |
| pub(crate) struct Namespace { |
| segments: Vec<Ident>, |
| } |
| |
| impl Namespace { |
| pub(crate) const ROOT: Self = Namespace { |
| segments: Vec::new(), |
| }; |
| |
| pub(crate) fn iter(&self) -> Iter<Ident> { |
| self.segments.iter() |
| } |
| |
| pub(crate) fn parse_bridge_attr_namespace(input: ParseStream) -> Result<Self> { |
| if input.is_empty() { |
| return Ok(Namespace::ROOT); |
| } |
| |
| input.parse::<kw::namespace>()?; |
| input.parse::<Token![=]>()?; |
| let namespace = input.parse::<Namespace>()?; |
| input.parse::<Option<Token![,]>>()?; |
| Ok(namespace) |
| } |
| |
| pub(crate) fn parse_meta(meta: &Meta) -> Result<Self> { |
| if let Meta::NameValue(meta) = meta { |
| match &meta.value { |
| Expr::Lit(expr) => { |
| if let Lit::Str(lit) = &expr.lit { |
| let segments = QualifiedName::parse_quoted(lit)?.segments; |
| return Ok(Namespace { segments }); |
| } |
| } |
| Expr::Path(expr) |
| if expr.qself.is_none() |
| && expr |
| .path |
| .segments |
| .iter() |
| .all(|segment| segment.arguments.is_none()) => |
| { |
| let segments = expr |
| .path |
| .segments |
| .iter() |
| .map(|segment| segment.ident.clone()) |
| .collect(); |
| return Ok(Namespace { segments }); |
| } |
| _ => {} |
| } |
| } |
| Err(Error::new_spanned(meta, "unsupported namespace attribute")) |
| } |
| } |
| |
| impl Default for &Namespace { |
| fn default() -> Self { |
| const ROOT: &Namespace = &Namespace::ROOT; |
| ROOT |
| } |
| } |
| |
| impl Parse for Namespace { |
| fn parse(input: ParseStream) -> Result<Self> { |
| let segments = QualifiedName::parse_quoted_or_unquoted(input)?.segments; |
| 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() |
| } |
| } |
| |
| impl<'a> FromIterator<&'a Ident> for Namespace { |
| fn from_iter<I>(idents: I) -> Self |
| where |
| I: IntoIterator<Item = &'a Ident>, |
| { |
| let segments = idents.into_iter().cloned().collect(); |
| Namespace { segments } |
| } |
| } |