1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117

// Copyright 2018 Syn Developers
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.

use super::*;
use proc_macro2::TokenStream;
use token::{Brace, Bracket, Paren};

#[cfg(feature = "extra-traits")]
use std::hash::{Hash, Hasher};
#[cfg(feature = "extra-traits")]
use tt::TokenStreamHelper;

ast_struct! {
    /// A macro invocation: `println!("{}", mac)`.
    ///
    /// *This type is available if Syn is built with the `"derive"` or `"full"`
    /// feature.*
    pub struct Macro #manual_extra_traits {
        pub path: Path,
        pub bang_token: Token![!],
        pub delimiter: MacroDelimiter,
        pub tts: TokenStream,
    }
}

ast_enum! {
    /// A grouping token that surrounds a macro body: `m!(...)` or `m!{...}` or `m![...]`.
    ///
    /// *This type is available if Syn is built with the `"derive"` or `"full"`
    /// feature.*
    pub enum MacroDelimiter {
        Paren(Paren),
        Brace(Brace),
        Bracket(Bracket),
    }
}

#[cfg(feature = "extra-traits")]
impl Eq for Macro {}

#[cfg(feature = "extra-traits")]
impl PartialEq for Macro {
    fn eq(&self, other: &Self) -> bool {
        self.path == other.path
            && self.bang_token == other.bang_token
            && self.delimiter == other.delimiter
            && TokenStreamHelper(&self.tts) == TokenStreamHelper(&other.tts)
    }
}

#[cfg(feature = "extra-traits")]
impl Hash for Macro {
    fn hash<H>(&self, state: &mut H)
    where
        H: Hasher,
    {
        self.path.hash(state);
        self.bang_token.hash(state);
        self.delimiter.hash(state);
        TokenStreamHelper(&self.tts).hash(state);
    }
}

#[cfg(feature = "parsing")]
pub mod parsing {
    use super::*;

    use synom::Synom;

    impl Synom for Macro {
        named!(parse -> Self, do_parse!(
            what: call!(Path::parse_mod_style) >>
            bang: punct!(!) >>
            body: call!(tt::delimited) >>
            (Macro {
                path: what,
                bang_token: bang,
                delimiter: body.0,
                tts: body.1,
            })
        ));

        fn description() -> Option<&'static str> {
            Some("macro invocation")
        }
    }
}

#[cfg(feature = "printing")]
mod printing {
    use super::*;
    use proc_macro2::TokenStream;
    use quote::ToTokens;

    impl ToTokens for Macro {
        fn to_tokens(&self, tokens: &mut TokenStream) {
            self.path.to_tokens(tokens);
            self.bang_token.to_tokens(tokens);
            match self.delimiter {
                MacroDelimiter::Paren(ref paren) => {
                    paren.surround(tokens, |tokens| self.tts.to_tokens(tokens));
                }
                MacroDelimiter::Brace(ref brace) => {
                    brace.surround(tokens, |tokens| self.tts.to_tokens(tokens));
                }
                MacroDelimiter::Bracket(ref bracket) => {
                    bracket.surround(tokens, |tokens| self.tts.to_tokens(tokens));
                }
            }
        }
    }
}