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
use super::Tokens; pub trait ToTokens { fn to_tokens(&self, &mut Tokens); } impl<'a, T: ?Sized + ToTokens> ToTokens for &'a T { fn to_tokens(&self, tokens: &mut Tokens) { (**self).to_tokens(tokens); } } impl<T: ?Sized + ToTokens> ToTokens for Box<T> { fn to_tokens(&self, tokens: &mut Tokens) { (**self).to_tokens(tokens); } } impl<T: ToTokens> ToTokens for Option<T> { fn to_tokens(&self, tokens: &mut Tokens) { if let Some(ref t) = *self { t.to_tokens(tokens); } } } impl ToTokens for str { fn to_tokens(&self, tokens: &mut Tokens) { tokens.append(&escape_str(self)); } } impl ToTokens for String { fn to_tokens(&self, tokens: &mut Tokens) { self.as_str().to_tokens(tokens); } } impl ToTokens for char { fn to_tokens(&self, tokens: &mut Tokens) { match *self { '\0' => tokens.append(r"'\0'"), '"' => tokens.append("'\"'"), _ => tokens.append(&format!("{:?}", self)), } } } #[derive(Debug)] pub struct ByteStr<'a>(pub &'a str); impl<'a> ToTokens for ByteStr<'a> { fn to_tokens(&self, tokens: &mut Tokens) { tokens.append(&format!("b{}", escape_str(self.0))); } } fn escape_str(s: &str) -> String { let mut escaped = "\"".to_string(); for ch in s.chars() { match ch { '\0' => escaped.push_str(r"\0"), '\'' => escaped.push_str("'"), _ => escaped.extend(ch.escape_default().map(|c| c as char)), } } escaped.push('"'); escaped } macro_rules! impl_to_tokens_display { ($ty:ty) => { impl ToTokens for $ty { fn to_tokens(&self, tokens: &mut Tokens) { tokens.append(&self.to_string()); } } }; } impl_to_tokens_display!(Tokens); impl_to_tokens_display!(bool); macro_rules! impl_to_tokens_integer { ($ty:ty) => { impl ToTokens for $ty { fn to_tokens(&self, tokens: &mut Tokens) { tokens.append(&format!(concat!("{}", stringify!($ty)), self)); } } }; } impl_to_tokens_integer!(i8); impl_to_tokens_integer!(i16); impl_to_tokens_integer!(i32); impl_to_tokens_integer!(i64); impl_to_tokens_integer!(isize); impl_to_tokens_integer!(u8); impl_to_tokens_integer!(u16); impl_to_tokens_integer!(u32); impl_to_tokens_integer!(u64); impl_to_tokens_integer!(usize); macro_rules! impl_to_tokens_floating { ($ty:ty) => { impl ToTokens for $ty { fn to_tokens(&self, tokens: &mut Tokens) { use std::num::FpCategory::*; match self.classify() { Zero | Subnormal | Normal => { tokens.append(&format!(concat!("{}", stringify!($ty)), self)); } Nan => { tokens.append("::"); tokens.append("std"); tokens.append("::"); tokens.append(stringify!($ty)); tokens.append("::"); tokens.append("NAN"); } Infinite => { tokens.append("::"); tokens.append("std"); tokens.append("::"); tokens.append(stringify!($ty)); tokens.append("::"); if self.is_sign_positive() { tokens.append("INFINITY"); } else { tokens.append("NEG_INFINITY"); } } } } } }; } impl_to_tokens_floating!(f32); impl_to_tokens_floating!(f64);