util: + findSectionHeading

src/wiki/util/findSectionHeading.ts

@@ -0,0 +1,26 @@
+/**
+ * Finds a MediaWiki section heading from the current DOM using its title.
+ *
+ * @param sectionHeadingName The name of the section to find.
+ * @param n The `n` of the section. Starts at 1.
+ * @return The found section heading. `null` if not found.
+ */
+export default function findSectionHeading(
+	sectionHeadingName: string,
+	n = 1
+): HTMLElement | null {
+	let currentN = 1;
+
+	const headlines = Array.from( document.querySelectorAll( 'h2 > .mw-headline' ) );
+	for ( const el of headlines ) {
+		if ( el instanceof HTMLElement && el.innerText === sectionHeadingName ) {
+			if ( currentN >= n ) {
+				return el.parentElement;
+			} else {
+				currentN++;
+			}
+		}
+	}
+
+	return null;
+}

src/wiki/util/index.ts

@@ -1,6 +1,7 @@
 import decorateEditSummary from './decorateEditSummary';
 import delink from './delink';
 import errorToOO from './errorToOO';
+import findSectionHeading from './findSectionHeading';
 import getApiErrorText from './getApiErrorText';
 import getNativeRange from './getNativeRange';
 import getPageContent from './getPageContent';
@@ -32,6 +33,7 @@ export default {
 	decorateEditSummary: decorateEditSummary,
 	delink: delink,
 	errorToOO: errorToOO,
+	findSectionHeading: findSectionHeading,
 	getApiErrorText: getApiErrorText,
 	getNativeRange: getNativeRange,
 	getPageContent: getPageContent,