n8n/packages/editor-ui/src/utils/mappingUtils.ts

export function generatePath(root: string, path: Array<string | number>): string {
	return path.reduce((accu: string, part: string | number) => {
		if (typeof part === 'number') {
			return `${accu}[${part}]`;
		}

		if (part.includes(' ') || part.includes('.')) {
			return `${accu}["${part}"]`;
		}

		return `${accu}.${part}`;
	}, root);
}

export function getMappedExpression({
	nodeName,
	distanceFromActive,
	path,
}: {
	nodeName: string;
	distanceFromActive: number;
	path: Array<string | number> | string;
}) {
	const root = distanceFromActive === 1 ? '$json' : generatePath('$node', [nodeName, 'json']);

	if (typeof path === 'string') {
		return `{{ ${root}${path} }}`;
	}

	return `{{ ${generatePath(root, path)} }}`;
}