chore: import upstream snapshot with attribution

js/code/shared/language.ts

@@ -0,0 +1,102 @@
+import type { Extension } from "@codemirror/state";
+import { StreamLanguage } from "@codemirror/language";
+import { _ } from "svelte-i18n";
+
+const sql_dialects = [
+	"standardSQL",
+	"msSQL",
+	"mySQL",
+	"mariaDB",
+	"sqlite",
+	"cassandra",
+	"plSQL",
+	"hive",
+	"pgSQL",
+	"gql",
+	"gpSQL",
+	"sparkSQL",
+	"esper"
+] as const;
+
+const lang_map: Record<string, (() => Promise<Extension>) | undefined> = {
+	python: () => import("@codemirror/lang-python").then((m) => m.python()),
+	c: () =>
+		import("@codemirror/legacy-modes/mode/clike").then((m) =>
+			StreamLanguage.define(m.c)
+		),
+	cpp: () =>
+		import("@codemirror/legacy-modes/mode/clike").then((m) =>
+			StreamLanguage.define(m.cpp)
+		),
+	markdown: async () => {
+		const [md, frontmatter] = await Promise.all([
+			import("@codemirror/lang-markdown"),
+			import("./frontmatter")
+		]);
+		return md.markdown({ extensions: [frontmatter.frontmatter] });
+	},
+	latex: () =>
+		import("@codemirror/legacy-modes/mode/stex").then((m) =>
+			StreamLanguage.define(m.stex)
+		),
+	json: () => import("@codemirror/lang-json").then((m) => m.json()),
+	html: () => import("@codemirror/lang-html").then((m) => m.html()),
+	css: () => import("@codemirror/lang-css").then((m) => m.css()),
+	javascript: () =>
+		import("@codemirror/lang-javascript").then((m) => m.javascript()),
+	jinja2: () =>
+		import("@codemirror/legacy-modes/mode/jinja2").then((m) =>
+			StreamLanguage.define(m.jinja2)
+		),
+	typescript: () =>
+		import("@codemirror/lang-javascript").then((m) =>
+			m.javascript({ typescript: true })
+		),
+	yaml: () =>
+		import("@codemirror/legacy-modes/mode/yaml").then((m) =>
+			StreamLanguage.define(m.yaml)
+		),
+	dockerfile: () =>
+		import("@codemirror/legacy-modes/mode/dockerfile").then((m) =>
+			StreamLanguage.define(m.dockerFile)
+		),
+	shell: () =>
+		import("@codemirror/legacy-modes/mode/shell").then((m) =>
+			StreamLanguage.define(m.shell)
+		),
+	r: () =>
+		import("@codemirror/legacy-modes/mode/r").then((m) =>
+			StreamLanguage.define(m.r)
+		),
+	sql: () =>
+		import("@codemirror/legacy-modes/mode/sql").then((m) =>
+			StreamLanguage.define(m.standardSQL)
+		),
+	...Object.fromEntries(
+		sql_dialects.map((dialect) => [
+			"sql-" + dialect,
+			() =>
+				import("@codemirror/legacy-modes/mode/sql").then((m) =>
+					StreamLanguage.define(m[dialect])
+				)
+		])
+	)
+} as const;
+
+const alias_map: Record<string, string> = {
+	py: "python",
+	md: "markdown",
+	js: "javascript",
+	ts: "typescript",
+	sh: "shell"
+};
+
+export async function getLanguageExtension(
+	lang: string
+): Promise<Extension | undefined> {
+	const _lang = lang_map[lang] || lang_map[alias_map[lang]] || undefined;
+	if (_lang) {
+		return _lang();
+	}
+	return undefined;
+}