Function createBaseExtensions

src/cm/baseExtensions.ts:41–96

(
	options: BaseExtensionOptions = {},
)

 * Base extensions roughly matching the useful parts of CodeMirror's basicSetup
 */
export default function createBaseExtensions(
	options: BaseExtensionOptions = {},
): Extension[] {
	const {
		autoIndent = true,
		codeFolding = true,
		autoCloseBrackets = true,
		bracketMatching: enableBracketMatching = true,
		highlightActiveLine: enableHighlightActiveLine = true,
		highlightSelectionMatches: enableHighlightSelectionMatches = true,
	} = options;
	const extensions: Extension[] = [
		highlightSpecialChars(),
		history(),
	];

	if (enableHighlightActiveLine) extensions.push(highlightActiveLineGutter());
	if (codeFolding) extensions.push(foldGutter());
	extensions.push(drawSelection());
	extensions.push(dropCursor());
	extensions.push(EditorState.allowMultipleSelections.of(true));
	if (autoIndent) extensions.push(indentOnInput());
	extensions.push(
		syntaxHighlighting(defaultHighlightStyle, { fallback: true }),
	);
	if (enableBracketMatching) extensions.push(bracketMatching());
	if (autoCloseBrackets) extensions.push(closeBrackets());
	extensions.push(rectangularSelection());
	extensions.push(crosshairCursor());
	if (enableHighlightActiveLine) extensions.push(highlightActiveLine());
	if (enableHighlightSelectionMatches) {
		extensions.push(highlightSelectionMatches());
	}
	extensions.push(
		Prec.highest(keymap.of([{ key: "Tab", run: acceptCompletion }])),
	);
	extensions.push(
		keymap.of([...completionKeymap, ...defaultKeymap, ...historyKeymap]),
	);
	extensions.push(
		// This prevents tooltips from being going out of the editor area
		tooltips({
			tooltipSpace: (view) => {
				const rect = view.dom.getBoundingClientRect();
				return {
					top: rect.top,
					left: rect.left,
					bottom: window.innerHeight,
					right: window.innerWidth,
				};
			},
		}),
	);

	return extensions;
}