feat(smartjson): Add JSONL stringify and ordering comparator; fix empty buffer handling; refactor Smartjson folding/enfolding

ts/index.ts

@@ -22,6 +22,10 @@ export const parseJsonL = (jsonlData: string): JsonObject[] => {
   return parsedData;
 }
 
+export const stringifyJsonL = (items: any[]): string => {
+  return items.map((item) => stringify(item)).join('\n');
+}
+
 /**
  *
  * @param objArg
@@ -34,7 +38,20 @@ export const stringify = (
 ): string => {
   const bufferedJson = bufferhandling.stringify(objArg);
   objArg = JSON.parse(bufferedJson);
-  let returnJson = plugins.stableJson(objArg, optionsArg);
+  // derive a simple comparator from simpleOrderArray if provided and no custom cmp supplied
+  let options = { ...optionsArg };
+  if (simpleOrderArray && !options.cmp) {
+    const order = new Map<string, number>();
+    simpleOrderArray.forEach((key, idx) => order.set(key, idx));
+    options.cmp = (a, b) => {
+      const aIdx = order.has(a.key) ? (order.get(a.key) as number) : Number.POSITIVE_INFINITY;
+      const bIdx = order.has(b.key) ? (order.get(b.key) as number) : Number.POSITIVE_INFINITY;
+      if (aIdx !== bIdx) return aIdx - bIdx;
+      // fallback to lexicographic order for stable behavior
+      return a.key < b.key ? -1 : a.key > b.key ? 1 : 0;
+    };
+  }
+  let returnJson = plugins.stableJson(objArg, options);
   return returnJson;
 };
 
@@ -62,9 +79,10 @@ export class Smartjson {
    */
   public static enfoldFromObject<T extends typeof Smartjson>(this: T, objectArg: any): InstanceType<T> {
     const newInstance = new this() as InstanceType<T>;
+    const saveables: string[] = (newInstance as any).saveableProperties || [];
     for (const keyName in objectArg) {
-      if (newInstance.saveableProperties.indexOf(keyName) !== -1) {
-        newInstance[keyName] = objectArg[keyName];
+      if (saveables.indexOf(keyName) !== -1) {
+        (newInstance as any)[keyName] = objectArg[keyName];
       }
     }
     return newInstance;
@@ -88,26 +106,9 @@ export class Smartjson {
    * folds a class into an object
    */
   public foldToObject() {
-    const newFoldedObject: { [key: string]: any } = {};
     const trackSet = new Set<Smartjson>();
-    const foldValue = (val: any): any => {
-      if (val instanceof Smartjson) {
-        if (trackSet.has(val)) {
-          throw new Error('cycle detected');
-        }
-        trackSet.add(val);
-        return val.foldToObjectInternal(trackSet);
-      }
-      if (Array.isArray(val)) {
-        return val.map((item) => foldValue(item));
-      }
-      return plugins.lodashCloneDeep(val);
-    };
-    for (const keyName of this.saveableProperties) {
-      const value = this[keyName];
-      newFoldedObject[keyName] = foldValue(value);
-    }
-    return newFoldedObject;
+    trackSet.add(this);
+    return this.foldToObjectInternal(trackSet);
   }
 
   private foldToObjectInternal(trackSet: Set<Smartjson>) {
@@ -125,7 +126,8 @@ export class Smartjson {
       }
       return plugins.lodashCloneDeep(val);
     };
-    for (const keyName of this.saveableProperties) {
+    const props: string[] = (this as any).saveableProperties || [];
+    for (const keyName of props) {
       const value = this[keyName];
       result[keyName] = foldValue(value);
     }