chore(ckeditor5-admonition): integrate code structure

packages/ckeditor5-admonition/src/admonitionautoformat.ts

@@ -0,0 +1,41 @@
+import { Autoformat, blockAutoformatEditing, Plugin } from "ckeditor5";
+import { AdmonitionType, ADMONITION_TYPES } from "./admonitioncommand.js";
+
+function tryParseAdmonitionType(match: RegExpMatchArray) {
+	if (match.length !== 2) {
+		return;
+	}
+
+	if ((ADMONITION_TYPES as readonly string[]).includes(match[1])) {
+		return match[1] as AdmonitionType;
+	}
+}
+
+export default class AdmonitionAutoformat extends Plugin {
+
+	static get requires() {
+		return [ Autoformat ];
+	}
+
+	afterInit() {
+		if (!this.editor.commands.get("admonition")) {
+			return;
+		}
+
+		const instance = (this as any);
+		blockAutoformatEditing(this.editor, instance, /^\!\!\[*\! (.+) $/, ({ match }) => {
+			const type = tryParseAdmonitionType(match);
+
+			if (type) {
+				// User has entered the admonition type, so we insert as-is.
+				this.editor.execute("admonition", { forceValue: type });
+			} else {
+				// User has not entered a valid type, assume it's part of the text of the admonition.
+				this.editor.execute("admonition");
+				if (match.length > 1) {
+					this.editor.execute("insertText", { text: (match[1] ?? "") + " " });
+				}
+			}
+		});
+	}
+}