Alex Crichton | 44bffbc | 2017-05-19 17:51:59 -0700 | [diff] [blame] | 1 | extern crate proc_macro; |
| 2 | |
| 3 | #[macro_use] |
Alex Crichton | b15c635 | 2017-05-19 19:36:36 -0700 | [diff] [blame] | 4 | #[cfg(feature = "stable")] |
Alex Crichton | 44bffbc | 2017-05-19 17:51:59 -0700 | [diff] [blame] | 5 | extern crate synom; |
| 6 | |
| 7 | use std::fmt; |
| 8 | use std::ops; |
| 9 | use std::str::FromStr; |
| 10 | use std::iter::FromIterator; |
| 11 | |
| 12 | #[path = "stable.rs"] |
Alex Crichton | b15c635 | 2017-05-19 19:36:36 -0700 | [diff] [blame] | 13 | #[cfg(feature = "stable")] |
| 14 | mod imp; |
| 15 | #[path = "unstable.rs"] |
| 16 | #[cfg(not(feature = "stable"))] |
Alex Crichton | 44bffbc | 2017-05-19 17:51:59 -0700 | [diff] [blame] | 17 | mod imp; |
| 18 | |
| 19 | #[derive(Clone)] |
| 20 | pub struct TokenStream(imp::TokenStream); |
| 21 | |
| 22 | #[derive(Debug)] |
| 23 | pub struct LexError(imp::LexError); |
| 24 | |
| 25 | impl FromStr for TokenStream { |
| 26 | type Err = LexError; |
| 27 | |
| 28 | fn from_str(src: &str) -> Result<TokenStream, LexError> { |
| 29 | match src.parse() { |
| 30 | Ok(e) => Ok(TokenStream(e)), |
| 31 | Err(e) => Err(LexError(e)), |
| 32 | } |
| 33 | } |
| 34 | } |
| 35 | |
| 36 | impl fmt::Display for TokenStream { |
| 37 | fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { |
| 38 | self.0.fmt(f) |
| 39 | } |
| 40 | } |
| 41 | |
| 42 | impl From<proc_macro::TokenStream> for TokenStream { |
| 43 | fn from(inner: proc_macro::TokenStream) -> TokenStream { |
| 44 | TokenStream(inner.into()) |
| 45 | } |
| 46 | } |
| 47 | |
| 48 | impl From<TokenStream> for proc_macro::TokenStream { |
| 49 | fn from(inner: TokenStream) -> proc_macro::TokenStream { |
| 50 | inner.0.into() |
| 51 | } |
| 52 | } |
| 53 | |
| 54 | impl From<TokenTree> for TokenStream { |
| 55 | fn from(tree: TokenTree) -> TokenStream { |
| 56 | TokenStream(tree.into()) |
| 57 | } |
| 58 | } |
| 59 | |
| 60 | impl From<TokenKind> for TokenStream { |
| 61 | fn from(kind: TokenKind) -> TokenStream { |
| 62 | TokenTree::from(kind).into() |
| 63 | } |
| 64 | } |
| 65 | |
| 66 | impl<T: Into<TokenStream>> FromIterator<T> for TokenStream { |
| 67 | fn from_iter<I: IntoIterator<Item = T>>(streams: I) -> Self { |
| 68 | TokenStream(streams.into_iter().map(|t| t.into().0).collect()) |
| 69 | } |
| 70 | } |
| 71 | |
| 72 | impl IntoIterator for TokenStream { |
| 73 | type Item = TokenTree; |
| 74 | type IntoIter = TokenIter; |
| 75 | |
| 76 | fn into_iter(self) -> TokenIter { |
| 77 | TokenIter(self.0.into_iter()) |
| 78 | } |
| 79 | } |
| 80 | |
| 81 | impl TokenStream { |
| 82 | pub fn empty() -> TokenStream { |
| 83 | TokenStream(imp::TokenStream::empty()) |
| 84 | } |
| 85 | |
| 86 | pub fn is_empty(&self) -> bool { |
| 87 | self.0.is_empty() |
| 88 | } |
| 89 | } |
| 90 | |
| 91 | #[derive(Copy, Clone)] |
| 92 | pub struct Span(imp::Span); |
| 93 | |
| 94 | impl Default for Span { |
| 95 | fn default() -> Span { |
| 96 | Span(imp::Span::default()) |
| 97 | } |
| 98 | } |
| 99 | |
| 100 | impl Span { |
| 101 | pub fn call_site() -> Span { |
| 102 | Span(imp::Span::call_site()) |
| 103 | } |
| 104 | } |
| 105 | |
| 106 | #[derive(Clone)] |
| 107 | pub struct TokenTree { |
| 108 | pub span: Span, |
| 109 | pub kind: TokenKind, |
| 110 | } |
| 111 | |
| 112 | impl From<TokenKind> for TokenTree { |
| 113 | fn from(kind: TokenKind) -> TokenTree { |
| 114 | TokenTree { |
| 115 | span: Span::default(), |
| 116 | kind: kind, |
| 117 | } |
| 118 | } |
| 119 | } |
| 120 | |
Alex Crichton | 3d3e3d7 | 2017-05-19 19:50:09 -0700 | [diff] [blame] | 121 | impl From<Symbol> for TokenTree { |
| 122 | fn from(sym: Symbol) -> TokenTree { |
| 123 | TokenKind::Word(sym).into() |
| 124 | } |
| 125 | } |
| 126 | |
| 127 | impl From<Literal> for TokenTree { |
| 128 | fn from(lit: Literal) -> TokenTree { |
| 129 | TokenKind::Literal(lit).into() |
| 130 | } |
| 131 | } |
| 132 | |
Alex Crichton | 44bffbc | 2017-05-19 17:51:59 -0700 | [diff] [blame] | 133 | impl fmt::Display for TokenTree { |
| 134 | fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { |
| 135 | TokenStream::from(self.clone()).fmt(f) |
| 136 | } |
| 137 | } |
| 138 | |
| 139 | #[derive(Clone)] |
| 140 | pub enum TokenKind { |
| 141 | Sequence(Delimiter, TokenStream), |
| 142 | Word(Symbol), |
| 143 | Op(char, OpKind), |
| 144 | Literal(Literal), |
| 145 | } |
| 146 | |
| 147 | #[derive(Copy, Clone)] |
| 148 | pub enum Delimiter { |
| 149 | Parenthesis, |
| 150 | Brace, |
| 151 | Bracket, |
| 152 | None, |
| 153 | } |
| 154 | |
| 155 | #[derive(Copy, Clone)] |
| 156 | pub struct Symbol(imp::Symbol); |
| 157 | |
| 158 | impl<'a> From<&'a str> for Symbol { |
| 159 | fn from(string: &'a str) -> Symbol { |
| 160 | Symbol(string.into()) |
| 161 | } |
| 162 | } |
| 163 | |
Alex Crichton | 852d53d | 2017-05-19 19:25:08 -0700 | [diff] [blame] | 164 | impl From<String> for Symbol { |
| 165 | fn from(string: String) -> Symbol { |
| 166 | Symbol(string[..].into()) |
| 167 | } |
| 168 | } |
| 169 | |
Alex Crichton | 44bffbc | 2017-05-19 17:51:59 -0700 | [diff] [blame] | 170 | impl ops::Deref for Symbol { |
| 171 | type Target = str; |
| 172 | |
| 173 | fn deref(&self) -> &str { |
| 174 | &self.0 |
| 175 | } |
| 176 | } |
| 177 | |
| 178 | #[derive(Copy, Clone)] |
| 179 | pub enum OpKind { |
| 180 | Alone, |
| 181 | Joint, |
| 182 | } |
| 183 | |
| 184 | #[derive(Clone)] |
| 185 | pub struct Literal(imp::Literal); |
| 186 | |
| 187 | impl fmt::Display for Literal { |
| 188 | fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { |
| 189 | self.0.fmt(f) |
| 190 | } |
| 191 | } |
| 192 | |
Alex Crichton | 852d53d | 2017-05-19 19:25:08 -0700 | [diff] [blame] | 193 | impl Literal { |
Alex Crichton | 76a5cc8 | 2017-05-23 07:01:44 -0700 | [diff] [blame^] | 194 | pub fn bytechar(b: u8) -> Literal { |
| 195 | Literal(imp::Literal::bytechar(b)) |
| 196 | } |
| 197 | |
Alex Crichton | 852d53d | 2017-05-19 19:25:08 -0700 | [diff] [blame] | 198 | pub fn bytestring(s: &[u8]) -> Literal { |
| 199 | Literal(imp::Literal::bytestring(s)) |
| 200 | } |
Alex Crichton | 76a5cc8 | 2017-05-23 07:01:44 -0700 | [diff] [blame^] | 201 | |
| 202 | pub fn doccomment(s: &str) -> Literal { |
| 203 | Literal(imp::Literal::doccomment(s)) |
| 204 | } |
Alex Crichton | 852d53d | 2017-05-19 19:25:08 -0700 | [diff] [blame] | 205 | } |
| 206 | |
Alex Crichton | 44bffbc | 2017-05-19 17:51:59 -0700 | [diff] [blame] | 207 | macro_rules! tys { |
| 208 | ($($t:ty,)*) => {$( |
| 209 | impl<'a> From<$t> for Literal { |
| 210 | fn from(t: $t) -> Literal { |
| 211 | Literal(t.into()) |
| 212 | } |
| 213 | } |
| 214 | )*} |
| 215 | } |
| 216 | |
| 217 | tys! { |
Alex Crichton | 852d53d | 2017-05-19 19:25:08 -0700 | [diff] [blame] | 218 | u8, u16, u32, u64, usize, |
| 219 | i8, i16, i32, i64, isize, |
| 220 | f32, f64, char, &'a str, bool, |
Alex Crichton | 44bffbc | 2017-05-19 17:51:59 -0700 | [diff] [blame] | 221 | } |
| 222 | |
| 223 | pub struct TokenIter(imp::TokenIter); |
| 224 | |
| 225 | impl Iterator for TokenIter { |
| 226 | type Item = TokenTree; |
| 227 | |
| 228 | fn next(&mut self) -> Option<TokenTree> { |
| 229 | self.0.next() |
| 230 | } |
| 231 | } |