syn_pub_items/
ident.rs

1#[cfg(feature = "parsing")]
2use buffer::Cursor;
3#[cfg(feature = "parsing")]
4use lookahead;
5#[cfg(feature = "parsing")]
6use parse::{Parse, ParseStream, Result};
7#[cfg(feature = "parsing")]
8use token::Token;
9
10pub use proc_macro2::Ident;
11
12#[cfg(feature = "parsing")]
13#[doc(hidden)]
14#[allow(non_snake_case)]
15pub fn Ident(marker: lookahead::TokenMarker) -> Ident {
16    match marker {}
17}
18
19#[cfg(feature = "parsing")]
20fn accept_as_ident(ident: &Ident) -> bool {
21    match ident.to_string().as_str() {
22        "_"
23        // Based on https://doc.rust-lang.org/grammar.html#keywords
24        // and https://github.com/rust-lang/rfcs/blob/master/text/2421-unreservations-2018.md
25        // and https://github.com/rust-lang/rfcs/blob/master/text/2420-unreserve-proc.md
26        | "abstract" | "as" | "become" | "box" | "break" | "const"
27        | "continue" | "crate" | "do" | "else" | "enum" | "extern" | "false" | "final"
28        | "fn" | "for" | "if" | "impl" | "in" | "let" | "loop" | "macro" | "match"
29        | "mod" | "move" | "mut" | "override" | "priv" | "pub"
30        | "ref" | "return" | "Self" | "self" | "static" | "struct"
31        | "super" | "trait" | "true" | "type" | "typeof" | "unsafe" | "unsized" | "use"
32        | "virtual" | "where" | "while" | "yield" => false,
33        _ => true,
34    }
35}
36
37#[cfg(feature = "parsing")]
38impl Parse for Ident {
39    fn parse(input: ParseStream) -> Result<Self> {
40        input.step(|cursor| {
41            if let Some((ident, rest)) = cursor.ident() {
42                if accept_as_ident(&ident) {
43                    return Ok((ident, rest));
44                }
45            }
46            Err(cursor.error("expected identifier"))
47        })
48    }
49}
50
51#[cfg(feature = "parsing")]
52impl Token for Ident {
53    fn peek(cursor: Cursor) -> bool {
54        if let Some((ident, _rest)) = cursor.ident() {
55            accept_as_ident(&ident)
56        } else {
57            false
58        }
59    }
60
61    fn display() -> &'static str {
62        "identifier"
63    }
64}
65
66macro_rules! ident_from_token {
67    ($token:ident) => {
68        impl From<Token![$token]> for Ident {
69            fn from(token: Token![$token]) -> Ident {
70                Ident::new(stringify!($token), token.span)
71            }
72        }
73    };
74}
75
76ident_from_token!(self);
77ident_from_token!(Self);
78ident_from_token!(super);
79ident_from_token!(crate);
80ident_from_token!(extern);
81
82impl From<Token![_]> for Ident {
83    fn from(token: Token![_]) -> Ident {
84        Ident::new("_", token.span)
85    }
86}
syn_pub_items/ident.rs

syn_pub_items/
ident.rs
