refactor(packages): change package structure

packages/system/src/utils/marker.ts

@@ -0,0 +1,40 @@
+import type { BaseEdge, EdgeMarker, EdgeMarkerType, MarkerProps } from '../types';
+
+export function getMarkerId(marker: EdgeMarkerType | undefined, id?: string | null): string {
+  if (!marker) {
+    return '';
+  }
+
+  if (typeof marker === 'string') {
+    return marker;
+  }
+
+  const idPrefix = id ? `${id}__` : '';
+
+  return `${idPrefix}${Object.keys(marker)
+    .sort()
+    .map((key) => `${key}=${marker[key as keyof EdgeMarker]}`)
+    .join('&')}`;
+}
+
+export function createMarkerIds(
+  edges: BaseEdge[],
+  { id, defaultColor }: { id?: string | null; defaultColor?: string }
+) {
+  const ids: string[] = [];
+
+  return edges
+    .reduce<MarkerProps[]>((markers, edge) => {
+      [edge.markerStart, edge.markerEnd].forEach((marker) => {
+        if (marker && typeof marker === 'object') {
+          const markerId = getMarkerId(marker, id);
+          if (!ids.includes(markerId)) {
+            markers.push({ id: markerId, color: marker.color || defaultColor, ...marker });
+            ids.push(markerId);
+          }
+        }
+      });
+      return markers;
+    }, [])
+    .sort((a, b) => a.id.localeCompare(b.id));
+}