feat: Add assignment component with drag and drop to Set node (#8283)

Co-authored-by: Giulio Andreini <andreini@netseven.it>

packages/editor-ui/src/components/AssignmentCollection/utils.ts

@@ -0,0 +1,61 @@
+import { isObject } from 'lodash-es';
+import type { AssignmentValue, IDataObject } from 'n8n-workflow';
+import { resolveParameter } from '@/mixins/workflowHelpers';
+import { v4 as uuid } from 'uuid';
+
+export function nameFromExpression(expression: string): string {
+	return expression.replace(/^{{\s*|\s*}}$/g, '').replace('$json.', '');
+}
+
+export function inferAssignmentType(value: unknown): string {
+	if (typeof value === 'boolean') return 'boolean';
+	if (typeof value === 'number') return 'number';
+	if (typeof value === 'string') return 'string';
+	if (Array.isArray(value)) return 'array';
+	if (isObject(value)) return 'object';
+	return 'string';
+}
+
+export function typeFromExpression(expression: string): string {
+	try {
+		const resolved = resolveParameter(`=${expression}`);
+		return inferAssignmentType(resolved);
+	} catch (error) {
+		return 'string';
+	}
+}
+
+export function inputDataToAssignments(input: IDataObject): AssignmentValue[] {
+	const assignments: AssignmentValue[] = [];
+
+	function processValue(value: IDataObject, path: Array<string | number> = []) {
+		if (Array.isArray(value)) {
+			value.forEach((element, index) => {
+				processValue(element, [...path, index]);
+			});
+		} else if (isObject(value)) {
+			for (const [key, objectValue] of Object.entries(value)) {
+				processValue(objectValue as IDataObject, [...path, key]);
+			}
+		} else {
+			const stringPath = path.reduce((fullPath: string, part) => {
+				if (typeof part === 'number') {
+					return `${fullPath}[${part}]`;
+				}
+				return `${fullPath}.${part}`;
+			}, '$json');
+
+			const expression = `={{ ${stringPath} }}`;
+			assignments.push({
+				id: uuid(),
+				name: stringPath.replace('$json.', ''),
+				value: expression,
+				type: inferAssignmentType(value),
+			});
+		}
+	}
+
+	processValue(input);
+
+	return assignments;
+}