Press n or j to go to the next uncovered block, b, p or k for the previous block.
| 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 | /**
* Maps a file URI's extension to a CodeMirror 6 language extension for the
* read-only code preview (#1396). First-class language packs cover the
* languages most common in this repo; `@codemirror/legacy-modes` (one package,
* many `StreamLanguage` grammars) covers the long tail. Unknown extensions get
* no language (plain text with line numbers + neutral highlighting).
*
* @module
*/
import type { Extension } from "@codemirror/state";
import { StreamLanguage } from "@codemirror/language";
import { javascript } from "@codemirror/lang-javascript";
import { json } from "@codemirror/lang-json";
import { markdown } from "@codemirror/lang-markdown";
import { python } from "@codemirror/legacy-modes/mode/python";
import { go } from "@codemirror/legacy-modes/mode/go";
import { rust } from "@codemirror/legacy-modes/mode/rust";
import { shell } from "@codemirror/legacy-modes/mode/shell";
import { yaml } from "@codemirror/legacy-modes/mode/yaml";
import { toml } from "@codemirror/legacy-modes/mode/toml";
import { c, cpp, java, csharp, kotlin } from "@codemirror/legacy-modes/mode/clike";
/** Extract the lowercased file extension (without the dot) from a URI or path. */
function extensionOf(uri: string): string {
let path: string = uri;
try {
path = new URL(uri).pathname;
} catch {
// Not a URL — use the raw string.
}
const lastSlash = path.lastIndexOf("/");
const name = lastSlash >= 0 ? path.slice(lastSlash + 1) : path;
const dot = name.lastIndexOf(".");
return dot > 0 ? name.slice(dot + 1).toLowerCase() : "";
}
/**
* Resolve the CodeMirror language extension for a file URI, or `undefined` when
* no grammar is known (the editor still renders the text, just unhighlighted).
*/
export function languageExtensionForUri(uri: string): Extension | undefined {
const ext = extensionOf(uri);
switch (ext) {
case "js":
case "jsx":
case "mjs":
case "cjs":
return javascript({ jsx: true });
case "ts":
case "tsx":
return javascript({ jsx: true, typescript: true });
case "json":
case "jsonc":
return json();
case "md":
case "markdown":
return markdown();
case "py":
return StreamLanguage.define(python);
case "go":
return StreamLanguage.define(go);
case "rs":
return StreamLanguage.define(rust);
case "sh":
case "bash":
case "zsh":
return StreamLanguage.define(shell);
case "yaml":
case "yml":
return StreamLanguage.define(yaml);
case "toml":
return StreamLanguage.define(toml);
case "c":
case "h":
return StreamLanguage.define(c);
case "cpp":
case "cc":
case "cxx":
case "hpp":
case "hh":
return StreamLanguage.define(cpp);
case "java":
return StreamLanguage.define(java);
case "cs":
return StreamLanguage.define(csharp);
case "kt":
case "kts":
return StreamLanguage.define(kotlin);
default:
return undefined;
}
}
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