Allow override of prefix

README.md

@@ -9,9 +9,11 @@ json-order allows for conversion between JS Objects and a JSON string while keep
 ### `parse`
 To parse a JSON string and generate a map:
 ```js
-const result = orderedJson.parse('{...}');
+const result = orderedJson.parse('{...}', '$');
 ```
 
+The second parameter controls what the map prefix should be.
+
 `result.object` will contain a JS object while `result.map` will contain the generated property map.
 
 ### `stringify`

src/parse.ts

@@ -21,11 +21,11 @@ const traverseObject = (obj: object, map: PropertyMap, parentKey: string) => {
   });
 };
 
-const parse = (jsonString: string): OrderedParseResult => {
+const parse = (jsonString: string, prefix: string = '$'): OrderedParseResult => {
   const obj: object = JSON.parse(jsonString);
 
   const map = {};
-  traverseObject(obj, map, '$');
+  traverseObject(obj, map, prefix);
   return {
     object: obj,
     map

src/stringify.ts

@@ -44,15 +44,20 @@ const copyProperty = (sourceObject: object, resultObject: object, propertyPath:
   }
 };
 
-const stringify = (sourceObject: object, map: PropertyMap, space?: number): string => {
+const stringify = (sourceObject: object, map?: PropertyMap, space?: number): string => {
+  if (!map) {
+    return JSON.stringify(sourceObject, null, space);
+  }
+
   const mapKeys = Object.keys(map);
+  const prefixLength = mapKeys[0] && mapKeys[0].length || 0;
 
   const resultObject = {};
   mapKeys.forEach((mk) => {
     const childKeys = map[mk];
 
     // Remove starting $
-    const parentKey = mk.substr(1);
+    const parentKey = mk.substr(prefixLength);
 
     const parent = getProperty(sourceObject, parentKey);
 

test/parse.test.ts

@@ -2,7 +2,7 @@ import { PropertyMap } from '../src/models';
 import parse from '../src/parse';
 
 describe('parse ', () => {
-  const expectMap = (input: string, map: PropertyMap) => expect(parse(input).map).toEqual(map);
+  const expectMap = (input: string, map: PropertyMap) => expect(parse(input, '$').map).toEqual(map);
 
   it('returns nothing for a blank JSON string', () => expectMap('{}', {}));
 

test/stringify.test.ts

@@ -17,6 +17,12 @@ describe('stringify ', () => {
       { $: ['a'] },
       '{}'));
 
+  it('returns regular json string if map is undefined',
+    () => expectString(
+      { a: '1', b: '2' },
+      null,
+      '{"a":"1","b":"2"}'));
+
   it('ignores properties not found in map',
     () => expectString(
       { a: '1', b: '2' },