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
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149

//! Utils for tokens from synom::tokens.

use proc_macro2::Span;
use syn::token as tokens;

/// See [SpanExt#as_token][] for usage. Create tokens from [Span][].
///
///
///[SpanExt#as_token]:../trait.SpanExt.html#method.as_token
///[Span]:../../proc_macro2/struct.Span.html
pub trait FromSpan {
    fn from_span(span: Span) -> Self;
}

impl FromSpan for Span {
    #[inline(always)]
    fn from_span(span: Span) -> Self {
        span
    }
}

macro_rules! impl_array {
    ($n:expr) => {
        impl<T: FromSpan + Copy> FromSpan for [T; $n] {
            #[inline(always)]
            fn from_span(span: Span) -> Self{
                let e = FromSpan::from_span(span);
                [e; $n]
            }
        }
    };
    ($n:expr, $($rest:tt)*) => {
        impl_array!($n);
        impl_array!($($rest)*);
    };
}

impl_array!(1, 2, 3, 4);

macro_rules! bridge {
    // Done
    ($t:path) => {
        impl FromSpan for $t {
            fn from_span(span: Span) -> Self {
                let span = FromSpan::from_span(span);
                $t(span)
            }
        }
    };

    ($t:path, $($rest:tt)+) => {
        bridge!($t);
        bridge!($($rest)*);
    };
}

bridge!(
    tokens::Add,
    tokens::AddEq,
    tokens::And,
    tokens::AndAnd,
    tokens::AndEq,
    tokens::As,
    tokens::At,
    tokens::Auto,
    tokens::Bang,
    tokens::Box,
    tokens::Brace,
    tokens::Bracket,
    tokens::Break,
    tokens::CapSelf,
    tokens::Caret,
    tokens::CaretEq,
    tokens::Catch,
    tokens::Colon,
    tokens::Colon2,
    tokens::Comma,
    tokens::Const,
    tokens::Continue,
    tokens::Crate,
    tokens::Default,
    tokens::Div,
    tokens::DivEq,
    tokens::Do,
    tokens::Dot,
    tokens::Dot2,
    tokens::Dot3,
    tokens::DotDotEq,
    tokens::Dyn,
    tokens::Else,
    tokens::Enum,
    tokens::Eq,
    tokens::EqEq,
    tokens::Extern,
    tokens::Fn,
    tokens::For,
    tokens::Ge,
    tokens::Group,
    tokens::Gt,
    tokens::If,
    tokens::Impl,
    tokens::In,
    tokens::LArrow,
    tokens::Le,
    tokens::Let,
    tokens::Loop,
    tokens::Lt,
    tokens::Macro,
    tokens::Match,
    tokens::Mod,
    tokens::Move,
    tokens::MulEq,
    tokens::Mut,
    tokens::Ne,
    tokens::Or,
    tokens::OrEq,
    tokens::OrOr,
    tokens::Paren,
    tokens::Pound,
    tokens::Pub,
    tokens::Question,
    tokens::RArrow,
    tokens::Ref,
    tokens::Rem,
    tokens::RemEq,
    tokens::Return,
    tokens::Rocket,
    tokens::Self_,
    tokens::Semi,
    tokens::Shl,
    tokens::ShlEq,
    tokens::Shr,
    tokens::ShrEq,
    tokens::Star,
    tokens::Static,
    tokens::Struct,
    tokens::Sub,
    tokens::SubEq,
    tokens::Super,
    tokens::Trait,
    tokens::Type,
    tokens::Underscore,
    tokens::Union,
    tokens::Unsafe,
    tokens::Use,
    tokens::Where,
    tokens::While,
    tokens::Yield
);