pmhelp_internal/
parse.rs

1use syn::{
2    parenthesized,
3    parse::{Parse, ParseStream, Result},
4};
5
6struct Parenthesized<V: Parse>(V);
7impl<V: Parse> Parse for Parenthesized<V> {
8    fn parse(stream: ParseStream) -> Result<Self> {
9        let content;
10        let _ = parenthesized!(content in stream);
11        Ok(Self(V::parse(&content)?))
12    }
13}
14macro_rules! make_seperated_func {
15    ($name:ident, $token:path, $type:ident) => {
16        #[inline]
17        pub fn $name<P: Parse>(stream: paste! {[<$type Stream>]}) -> Result<Punctuated<P, $token>> {
18            separated::<P, $token>(stream)
19        }
20    };
21}
22
23/// Functions to parse `proc_macro2::TokenStream`s.
24pub mod token_stream {
25    use super::Parenthesized;
26    use proc_macro2::TokenStream;
27    use syn::{
28        parse::{Parse, Parser, Result},
29        punctuated::Punctuated,
30        token::Token,
31    };
32
33    #[inline]
34    pub fn parenthesized<V: Parse>(stream: TokenStream) -> Result<V> {
35        syn::parse2::<Parenthesized<V>>(stream).map(|v| v.0)
36    }
37
38    #[inline]
39    pub fn separated<P, T>(stream: TokenStream) -> Result<Punctuated<P, T>>
40    where
41        P: Parse,
42        T: Parse + Token,
43    {
44        Parser::parse2(Punctuated::<P, T>::parse_separated_nonempty, stream)
45    }
46
47    make_seperated_func! {
48        comma_separated, ::syn::token::Comma, Token
49    }
50}
51
52/// Functions to parse `syn::parse::ParseStream`s.
53pub mod parse_stream {
54    use super::Parenthesized;
55    use syn::{
56        parse::{Parse, ParseStream, Result},
57        punctuated::Punctuated,
58    };
59
60    #[inline]
61    pub fn parenthesized<V: Parse>(stream: ParseStream) -> Result<V> {
62        stream.parse::<Parenthesized<V>>().map(|v| v.0)
63    }
64
65    #[inline]
66    pub fn separated<P: Parse, T: Parse>(stream: ParseStream) -> Result<Punctuated<P, T>> {
67        <Punctuated<P, T>>::parse_terminated(stream)
68    }
69
70    make_seperated_func! {
71        comma_separated, ::syn::token::Comma, Parse
72    }
73}
pmhelp_internal/parse.rs

pmhelp_internal/
parse.rs
