| 1 | //! Language detection + the fixed dictionary mapping a language to the LSP |
| 2 | //! server binary that handles it. |
| 3 | //! |
| 4 | //! Built-in dictionary covers common languages. Users can override defaults |
| 5 | //! via `[lsp.servers]` and register custom language servers for additional |
| 6 | //! file extensions via `[lsp.custom]` in their config (handled by |
| 7 | //! [`super::LspConfig`], not this file). |
| 8 | |
| 9 | use std::path::Path; |
| 10 | |
| 11 | /// A language we know how to ask an LSP server about. Detected from the file |
| 12 | /// extension by [`detect_language`]. `Other` is a sentinel used when we do |
| 13 | /// not have an LSP for the file — the LSP manager treats it as "skip". |
| 14 | #[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)] |
| 15 | pub enum Language { |
| 16 | Rust, |
| 17 | Go, |
| 18 | Python, |
| 19 | TypeScript, |
| 20 | JavaScript, |
| 21 | Java, |
| 22 | Php, |
| 23 | Vue, |
| 24 | C, |
| 25 | Cpp, |
| 26 | Other, |
| 27 | } |
| 28 | |
| 29 | impl Language { |
| 30 | /// Stable lowercase string used as the key in `[lsp.servers]` overrides |
| 31 | /// and in log lines. |
| 32 | #[must_use] |
| 33 | pub fn as_key(self) -> &'static str { |
| 34 | match self { |
| 35 | Language::Rust => "rust", |
| 36 | Language::Go => "go", |
| 37 | Language::Python => "python", |
| 38 | Language::TypeScript => "typescript", |
| 39 | Language::JavaScript => "javascript", |
| 40 | Language::Java => "java", |
| 41 | Language::Php => "php", |
| 42 | Language::Vue => "vue", |
| 43 | Language::C => "c", |
| 44 | Language::Cpp => "cpp", |
| 45 | Language::Other => "other", |
| 46 | } |
| 47 | } |
| 48 | |
| 49 | /// LSP `languageId` value used in `textDocument/didOpen`. We follow the |
| 50 | /// LSP-spec values: `rust`, `go`, `python`, `typescript`, `javascript`, |
| 51 | /// `java`, `vue`, `c`, `cpp`. |
| 52 | #[must_use] |
| 53 | pub fn language_id(self) -> &'static str { |
| 54 | match self { |
| 55 | Language::Rust => "rust", |
| 56 | Language::Go => "go", |
| 57 | Language::Python => "python", |
| 58 | Language::TypeScript => "typescript", |
| 59 | Language::JavaScript => "javascript", |
| 60 | Language::Java => "java", |
| 61 | Language::Php => "php", |
| 62 | Language::Vue => "vue", |
| 63 | Language::C => "c", |
| 64 | Language::Cpp => "cpp", |
| 65 | Language::Other => "plaintext", |
| 66 | } |
| 67 | } |
| 68 | } |
| 69 | |
| 70 | /// Detect the language of `path` from its extension. Falls back to |
| 71 | /// `Language::Other` when the extension is unknown (or the file has none), |
| 72 | /// which signals "skip" to the manager. |
| 73 | #[must_use] |
| 74 | pub fn detect_language(path: &Path) -> Language { |
| 75 | let ext = match path.extension().and_then(|e| e.to_str()) { |
| 76 | Some(ext) => ext.to_ascii_lowercase(), |
| 77 | None => return Language::Other, |
| 78 | }; |
| 79 | match ext.as_str() { |
| 80 | "rs" => Language::Rust, |
| 81 | "go" => Language::Go, |
| 82 | "py" | "pyi" => Language::Python, |
| 83 | "ts" | "tsx" => Language::TypeScript, |
| 84 | "js" | "jsx" | "mjs" | "cjs" => Language::JavaScript, |
| 85 | "java" => Language::Java, |
| 86 | "php" => Language::Php, |
| 87 | "vue" => Language::Vue, |
| 88 | "c" | "h" => Language::C, |
| 89 | "cpp" | "cc" | "cxx" | "hpp" | "hxx" | "hh" => Language::Cpp, |
| 90 | _ => Language::Other, |
| 91 | } |
| 92 | } |
| 93 | |
| 94 | /// Fixed default for "what executable + args do we run for `lang`?". |
| 95 | /// Returns `None` when no LSP server is wired for that language. The TUI |
| 96 | /// config layer can override this dictionary at runtime. |
| 97 | #[must_use] |
| 98 | pub fn server_for(lang: Language) -> Option<(&'static str, &'static [&'static str])> { |
| 99 | match lang { |
| 100 | Language::Rust => Some(("rust-analyzer", &[])), |
| 101 | Language::Go => Some(("gopls", &["serve"])), |
| 102 | Language::Python => Some(("pyright-langserver", &["--stdio"])), |
| 103 | Language::TypeScript | Language::JavaScript => { |
| 104 | Some(("typescript-language-server", &["--stdio"])) |
| 105 | } |
| 106 | Language::Java => Some(("jdtls", &[])), |
| 107 | Language::Php => Some(("intelephense", &["--stdio"])), |
| 108 | Language::Vue => Some(("vue-language-server", &["--stdio"])), |
| 109 | Language::C | Language::Cpp => Some(("clangd", &[])), |
| 110 | Language::Other => None, |
| 111 | } |
| 112 | } |
| 113 | |
| 114 | #[cfg(test)] |
| 115 | mod tests { |
| 116 | use super::*; |
| 117 | use std::path::PathBuf; |
| 118 | |
| 119 | #[test] |
| 120 | fn detects_rust_extension() { |
| 121 | assert_eq!(detect_language(&PathBuf::from("foo.rs")), Language::Rust); |
| 122 | assert_eq!(detect_language(&PathBuf::from("FOO.RS")), Language::Rust); |
| 123 | } |
| 124 | |
| 125 | #[test] |
| 126 | fn detects_unknown_as_other() { |
| 127 | assert_eq!( |
| 128 | detect_language(&PathBuf::from("notes.txt")), |
| 129 | Language::Other |
| 130 | ); |
| 131 | assert_eq!(detect_language(&PathBuf::from("README")), Language::Other); |
| 132 | } |
| 133 | |
| 134 | #[test] |
| 135 | fn detects_typescript_variants() { |
| 136 | assert_eq!( |
| 137 | detect_language(&PathBuf::from("foo.ts")), |
| 138 | Language::TypeScript |
| 139 | ); |
| 140 | assert_eq!( |
| 141 | detect_language(&PathBuf::from("foo.tsx")), |
| 142 | Language::TypeScript |
| 143 | ); |
| 144 | assert_eq!( |
| 145 | detect_language(&PathBuf::from("foo.js")), |
| 146 | Language::JavaScript |
| 147 | ); |
| 148 | } |
| 149 | |
| 150 | #[test] |
| 151 | fn detects_java_extension() { |
| 152 | assert_eq!(detect_language(&PathBuf::from("App.java")), Language::Java); |
| 153 | assert_eq!(detect_language(&PathBuf::from("APP.JAVA")), Language::Java); |
| 154 | } |
| 155 | |
| 156 | #[test] |
| 157 | fn detects_php_extension() { |
| 158 | assert_eq!(detect_language(&PathBuf::from("index.php")), Language::Php); |
| 159 | assert_eq!(detect_language(&PathBuf::from("INDEX.PHP")), Language::Php); |
| 160 | assert_eq!(detect_language(&PathBuf::from("router.php")), Language::Php); |
| 161 | } |
| 162 | |
| 163 | #[test] |
| 164 | fn detects_vue_extension() { |
| 165 | assert_eq!( |
| 166 | detect_language(&PathBuf::from("Component.vue")), |
| 167 | Language::Vue |
| 168 | ); |
| 169 | assert_eq!( |
| 170 | detect_language(&PathBuf::from("COMPONENT.VUE")), |
| 171 | Language::Vue |
| 172 | ); |
| 173 | } |
| 174 | |
| 175 | #[test] |
| 176 | fn language_ids_for_php_and_vue_match_lsp_values() { |
| 177 | assert_eq!(Language::Php.as_key(), "php"); |
| 178 | assert_eq!(Language::Php.language_id(), "php"); |
| 179 | assert_eq!(Language::Vue.as_key(), "vue"); |
| 180 | assert_eq!(Language::Vue.language_id(), "vue"); |
| 181 | } |
| 182 | |
| 183 | #[test] |
| 184 | fn server_for_php_is_intelephense() { |
| 185 | let (cmd, args) = server_for(Language::Php).expect("php has a server"); |
| 186 | assert_eq!(cmd, "intelephense"); |
| 187 | assert_eq!(args, &["--stdio"]); |
| 188 | } |
| 189 | |
| 190 | #[test] |
| 191 | fn language_ids_for_java_and_vue_match_lsp_values() { |
| 192 | assert_eq!(Language::Java.as_key(), "java"); |
| 193 | assert_eq!(Language::Java.language_id(), "java"); |
| 194 | assert_eq!(Language::Vue.as_key(), "vue"); |
| 195 | assert_eq!(Language::Vue.language_id(), "vue"); |
| 196 | } |
| 197 | |
| 198 | #[test] |
| 199 | fn server_for_rust_is_rust_analyzer() { |
| 200 | let (cmd, args) = server_for(Language::Rust).expect("rust has a server"); |
| 201 | assert_eq!(cmd, "rust-analyzer"); |
| 202 | assert!(args.is_empty()); |
| 203 | } |
| 204 | |
| 205 | #[test] |
| 206 | fn server_for_java_is_jdtls() { |
| 207 | let (cmd, args) = server_for(Language::Java).expect("java has a server"); |
| 208 | assert_eq!(cmd, "jdtls"); |
| 209 | assert!(args.is_empty()); |
| 210 | } |
| 211 | |
| 212 | #[test] |
| 213 | fn server_for_vue_is_vue_language_server() { |
| 214 | let (cmd, args) = server_for(Language::Vue).expect("vue has a server"); |
| 215 | assert_eq!(cmd, "vue-language-server"); |
| 216 | assert_eq!(args, &["--stdio"]); |
| 217 | } |
| 218 | |
| 219 | #[test] |
| 220 | fn server_for_other_is_none() { |
| 221 | assert!(server_for(Language::Other).is_none()); |
| 222 | } |
| 223 | } |
| 224 |