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use std::fmt::{self, Display}; #[derive(Debug, Clone, Eq, Hash)] pub struct Ident(String); impl Ident { pub fn new<T: Into<Ident>>(t: T) -> Self { t.into() } } impl<'a> From<&'a str> for Ident { fn from(s: &str) -> Self { Ident(s.to_owned()) } } impl From<String> for Ident { fn from(s: String) -> Self { Ident(s) } } impl AsRef<str> for Ident { fn as_ref(&self) -> &str { &self.0 } } impl Display for Ident { fn fmt(&self, formatter: &mut fmt::Formatter) -> Result<(), fmt::Error> { self.0.fmt(formatter) } } impl<T: ?Sized> PartialEq<T> for Ident where T: AsRef<str> { fn eq(&self, other: &T) -> bool { self.0 == other.as_ref() } } #[cfg(feature = "parsing")] pub mod parsing { use super::*; use nom::multispace; fn ident_ch(ch: char) -> bool { ch.is_alphanumeric() || ch == '_' } named!(pub ident<&str, Ident>, preceded!( option!(multispace), map!(take_while1_s!(ident_ch), Into::into) )); } #[cfg(feature = "printing")] mod printing { use super::*; use quote::{Tokens, ToTokens}; impl ToTokens for Ident { fn to_tokens(&self, tokens: &mut Tokens) { tokens.append(self.as_ref()) } } }