implement setPath

src/core/file-handling/formats/json.js

@@ -24,7 +24,38 @@ export const JsonHandler = {
       .run(content);
 
   },
-  setPath() {
-    throw new Error("Not implemented");
+  setPath(oldJSON, key, value) {
+    oldJSON = oldJSON.trim().length > 0 ? oldJSON : "{}";
+    const obj = JSON.parse(oldJSON);
+
+
+    const path = key.split(".");
+
+    /**
+     * 
+     * @param {any} tree 
+     * @param {string[]} path 
+     * @param {string} value 
+     * @returns 
+     */
+    function setOnTree(tree, path, value) {
+      if (path.length === 1) {
+        tree[path[0]] = value;
+        return;
+      }
+
+      //Split the path into the current level and the rest of the path
+
+      const [current, ...rest] = path;
+      if (!current) throw new Error("Current is undefined. This should never happen");
+      if (!tree[current]) tree[current] = {};
+      setOnTree(tree[current], rest, value);
+    }
+
+
+    setOnTree(obj, path, value);
+
+    const newJSON = JSON.stringify(obj);
+    return newJSON;
   },
 };

src/core/file-handling/formats/json.test.js

@@ -38,4 +38,44 @@ describe("JsonHandler", () => {
 
     expect(parseInvalid).toThrow(LoadingException);
   });
+
+  it("sets a key on the top level", () => {
+    const oldObject = { key1: "value1", key2: "value2" };
+    const oldJSON = JSON.stringify(oldObject);
+
+    const newJSON = JsonHandler.setPath(oldJSON, "key3", "value3");
+    const newObject = JSON.parse(newJSON);
+
+    expect(newObject).toEqual({ ...oldObject, key3: "value3" });
+  });
+
+  it("sets a key if the original file is empty", () => {
+    const oldJSON = "";
+
+    const newJSON = JsonHandler.setPath(oldJSON, "newKey", "newValue");
+    const newObject = JSON.parse(newJSON);
+
+    expect(newObject).toEqual({ newKey: "newValue" });
+  });
+
+  it("sets a key on a deeply nested level", () => {
+    const oldObject = {
+      common: { save: "Save", cancel: "Cancel" },
+      home: { title: "Home" },
+    };
+
+    const oldJSON = JSON.stringify(oldObject);
+
+    const newJSON = JsonHandler.setPath(
+      oldJSON,
+      "home.subtitle.description",
+      "Subtitle"
+    );
+    const newObject = JSON.parse(newJSON);
+
+    expect(newObject).toEqual({
+      common: { save: "Save", cancel: "Cancel" },
+      home: { title: "Home", subtitle: { description: "Subtitle" } },
+    });
+  });
 });