Chih-Hung Hsieh | 92ff605 | 2020-06-10 20:18:39 -0700 | [diff] [blame] | 1 | use std::fmt; |
| 2 | use std::iter; |
| 3 | |
| 4 | /// Valid Rust identifier |
| 5 | #[derive(Eq, PartialEq, Debug, Clone)] |
| 6 | pub(crate) struct RustIdent(String); |
| 7 | |
| 8 | #[allow(dead_code)] |
| 9 | impl RustIdent { |
| 10 | pub fn new(s: &str) -> RustIdent { |
| 11 | assert!(!s.is_empty()); |
| 12 | assert!(!s.contains("/"), "{}", s); |
| 13 | assert!(!s.contains("."), "{}", s); |
| 14 | assert!(!s.contains(":"), "{}", s); |
| 15 | RustIdent(s.to_owned()) |
| 16 | } |
| 17 | |
| 18 | pub fn super_ident() -> RustIdent { |
| 19 | RustIdent::new("super") |
| 20 | } |
| 21 | |
| 22 | pub fn get(&self) -> &str { |
| 23 | &self.0 |
| 24 | } |
| 25 | |
| 26 | pub fn into_string(self) -> String { |
| 27 | self.0 |
| 28 | } |
| 29 | |
| 30 | pub fn to_path(&self) -> RustIdentWithPath { |
| 31 | RustIdentWithPath::from(&self.0) |
| 32 | } |
| 33 | } |
| 34 | |
| 35 | impl fmt::Display for RustIdent { |
| 36 | fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { |
| 37 | fmt::Display::fmt(&self.get(), f) |
| 38 | } |
| 39 | } |
| 40 | |
| 41 | impl From<&'_ str> for RustIdent { |
| 42 | fn from(s: &str) -> Self { |
| 43 | RustIdent::new(s) |
| 44 | } |
| 45 | } |
| 46 | |
| 47 | impl From<String> for RustIdent { |
| 48 | fn from(s: String) -> Self { |
| 49 | RustIdent::new(&s) |
| 50 | } |
| 51 | } |
| 52 | |
| 53 | impl Into<String> for RustIdent { |
| 54 | fn into(self) -> String { |
| 55 | self.0 |
| 56 | } |
| 57 | } |
| 58 | |
| 59 | #[derive(Default, Eq, PartialEq, Debug, Clone)] |
| 60 | pub(crate) struct RustRelativePath { |
| 61 | path: Vec<RustIdent>, |
| 62 | } |
| 63 | |
| 64 | #[allow(dead_code)] |
| 65 | impl RustRelativePath { |
| 66 | pub fn into_path(self) -> RustPath { |
| 67 | RustPath { |
| 68 | absolute: false, |
| 69 | path: self, |
| 70 | } |
| 71 | } |
| 72 | |
| 73 | pub fn empty() -> RustRelativePath { |
| 74 | RustRelativePath { path: Vec::new() } |
| 75 | } |
| 76 | |
| 77 | pub fn from_components<I: IntoIterator<Item = RustIdent>>(i: I) -> RustRelativePath { |
| 78 | RustRelativePath { |
| 79 | path: i.into_iter().collect(), |
| 80 | } |
| 81 | } |
| 82 | |
| 83 | pub fn is_empty(&self) -> bool { |
| 84 | self.path.is_empty() |
| 85 | } |
| 86 | |
| 87 | pub fn first(&self) -> Option<RustIdent> { |
| 88 | self.path.iter().cloned().next() |
| 89 | } |
| 90 | |
| 91 | pub fn remove_first(&mut self) -> Option<RustIdent> { |
| 92 | if self.path.is_empty() { |
| 93 | None |
| 94 | } else { |
| 95 | Some(self.path.remove(0)) |
| 96 | } |
| 97 | } |
| 98 | |
| 99 | pub fn prepend_ident(&mut self, ident: RustIdent) { |
| 100 | self.path.insert(0, ident); |
| 101 | } |
| 102 | |
| 103 | pub fn append(mut self, path: RustRelativePath) -> RustRelativePath { |
| 104 | for c in path.path { |
| 105 | self.path.push(c); |
| 106 | } |
| 107 | self |
| 108 | } |
| 109 | |
| 110 | pub fn push_ident(&mut self, ident: RustIdent) { |
| 111 | self.path.push(ident); |
| 112 | } |
| 113 | |
| 114 | pub fn _append_ident(mut self, ident: RustIdent) -> RustRelativePath { |
| 115 | self.push_ident(ident); |
| 116 | self |
| 117 | } |
| 118 | |
| 119 | pub fn to_reverse(&self) -> RustRelativePath { |
| 120 | RustRelativePath::from_components( |
| 121 | iter::repeat(RustIdent::super_ident()).take(self.path.len()), |
| 122 | ) |
| 123 | } |
| 124 | } |
| 125 | |
| 126 | #[derive(Default, Eq, PartialEq, Debug, Clone)] |
| 127 | pub(crate) struct RustPath { |
| 128 | absolute: bool, |
| 129 | path: RustRelativePath, |
| 130 | } |
| 131 | |
| 132 | impl fmt::Display for RustRelativePath { |
| 133 | fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { |
| 134 | for (i, c) in self.path.iter().enumerate() { |
| 135 | if i != 0 { |
| 136 | write!(f, "::")?; |
| 137 | } |
| 138 | write!(f, "{}", c)?; |
| 139 | } |
| 140 | Ok(()) |
| 141 | } |
| 142 | } |
| 143 | |
| 144 | impl From<&'_ str> for RustRelativePath { |
| 145 | fn from(s: &str) -> Self { |
| 146 | RustRelativePath { |
| 147 | path: s.split("::").map(RustIdent::from).collect(), |
| 148 | } |
| 149 | } |
| 150 | } |
| 151 | |
| 152 | #[allow(dead_code)] |
| 153 | impl RustPath { |
| 154 | pub fn is_absolute(&self) -> bool { |
| 155 | self.absolute |
| 156 | } |
| 157 | |
| 158 | pub fn is_empty(&self) -> bool { |
| 159 | assert!(!self.absolute); |
| 160 | self.path.is_empty() |
| 161 | } |
| 162 | |
| 163 | pub fn with_ident(self, ident: RustIdent) -> RustIdentWithPath { |
| 164 | RustIdentWithPath { path: self, ident } |
| 165 | } |
| 166 | |
| 167 | pub fn first(&self) -> Option<RustIdent> { |
| 168 | assert!(!self.absolute); |
| 169 | self.path.first() |
| 170 | } |
| 171 | |
| 172 | pub fn remove_first(&mut self) -> Option<RustIdent> { |
| 173 | assert!(!self.absolute); |
| 174 | self.path.remove_first() |
| 175 | } |
| 176 | |
| 177 | pub fn to_reverse(&self) -> RustPath { |
| 178 | assert!(!self.absolute); |
| 179 | RustPath { |
| 180 | absolute: false, |
| 181 | path: self.path.to_reverse(), |
| 182 | } |
| 183 | } |
| 184 | |
| 185 | pub fn prepend_ident(&mut self, ident: RustIdent) { |
| 186 | assert!(!self.absolute); |
| 187 | self.path.prepend_ident(ident); |
| 188 | } |
| 189 | |
| 190 | pub fn append(self, path: RustPath) -> RustPath { |
| 191 | if path.absolute { |
| 192 | path |
| 193 | } else { |
| 194 | RustPath { |
| 195 | absolute: self.absolute, |
| 196 | path: self.path.append(path.path), |
| 197 | } |
| 198 | } |
| 199 | } |
| 200 | |
| 201 | pub fn append_ident(mut self, ident: RustIdent) -> RustPath { |
| 202 | self.path.path.push(ident); |
| 203 | self |
| 204 | } |
| 205 | |
| 206 | pub fn append_with_ident(self, path: RustIdentWithPath) -> RustIdentWithPath { |
| 207 | self.append(path.path).with_ident(path.ident) |
| 208 | } |
| 209 | } |
| 210 | |
| 211 | impl From<&'_ str> for RustPath { |
| 212 | fn from(s: &str) -> Self { |
| 213 | let (s, absolute) = if s.starts_with("::") { |
| 214 | (&s[2..], true) |
| 215 | } else { |
| 216 | (s, false) |
| 217 | }; |
| 218 | RustPath { |
| 219 | absolute, |
| 220 | path: RustRelativePath::from(s), |
| 221 | } |
| 222 | } |
| 223 | } |
| 224 | |
| 225 | impl From<String> for RustPath { |
| 226 | fn from(s: String) -> Self { |
| 227 | RustPath::from(&s[..]) |
| 228 | } |
| 229 | } |
| 230 | |
| 231 | impl fmt::Display for RustPath { |
| 232 | fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { |
| 233 | if self.absolute { |
| 234 | write!(f, "::")?; |
| 235 | } |
| 236 | write!(f, "{}", self.path) |
| 237 | } |
| 238 | } |
| 239 | |
| 240 | #[derive(Eq, PartialEq, Debug, Clone)] |
| 241 | pub(crate) struct RustIdentWithPath { |
| 242 | pub path: RustPath, |
| 243 | pub ident: RustIdent, |
| 244 | } |
| 245 | |
| 246 | #[allow(dead_code)] |
| 247 | impl RustIdentWithPath { |
| 248 | pub fn new(s: String) -> RustIdentWithPath { |
| 249 | let mut path = RustPath::from(s); |
| 250 | let ident = path.path.path.pop().unwrap(); |
| 251 | RustIdentWithPath { path, ident } |
| 252 | } |
| 253 | |
| 254 | pub fn prepend_ident(&mut self, ident: RustIdent) { |
| 255 | self.path.prepend_ident(ident) |
| 256 | } |
| 257 | |
| 258 | pub fn to_path(&self) -> RustPath { |
| 259 | self.path.clone().append_ident(self.ident.clone()) |
| 260 | } |
| 261 | } |
| 262 | |
| 263 | impl<S: Into<String>> From<S> for RustIdentWithPath { |
| 264 | fn from(s: S) -> Self { |
| 265 | RustIdentWithPath::new(s.into()) |
| 266 | } |
| 267 | } |
| 268 | |
| 269 | impl fmt::Display for RustIdentWithPath { |
| 270 | fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { |
| 271 | fmt::Display::fmt(&self.to_path(), f) |
| 272 | } |
| 273 | } |