From fbe6f9d2860d71122c7b74152009db93584bd2ba Mon Sep 17 00:00:00 2001
From: Nikolay <46225163+vigdorov@users.noreply.github.com>
Date: Mon, 28 Dec 2020 00:27:08 +0300
Subject: [PATCH] =?UTF-8?q?#21.=20=D0=94=D0=BE=D0=B1=D0=B0=D0=B2=D0=BB?=
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---
 src/core/utils/__test__/jsonParse.test.ts | 31 +++++++++++++++++++++++
 src/core/utils/jsonParse.ts               | 10 ++++++++
 src/core/utils/jsonStringify.ts           |  3 +++
 3 files changed, 44 insertions(+)
 create mode 100644 src/core/utils/__test__/jsonParse.test.ts
 create mode 100644 src/core/utils/jsonParse.ts
 create mode 100644 src/core/utils/jsonStringify.ts

diff --git a/src/core/utils/__test__/jsonParse.test.ts b/src/core/utils/__test__/jsonParse.test.ts
new file mode 100644
index 0000000..f75f886
--- /dev/null
+++ b/src/core/utils/__test__/jsonParse.test.ts
@@ -0,0 +1,31 @@
+import {jsonParse} from '../jsonParse';
+
+describe('jsonParse', () => {
+    it('Должен вернуть значение', () => {
+        expect(jsonParse('{}')).toEqual({});
+        expect(jsonParse('null')).toBeNull();
+        expect(jsonParse('0')).toBe(0);
+        expect(jsonParse(' 1  ')).toBe(1);
+    });
+
+    it('Должен вернуть значение при наличии дефолта', () => {
+        expect(jsonParse('{}', {str: 9})).toEqual({});
+        expect(jsonParse('null', {str: 9})).toBeNull();
+        expect(jsonParse('0', {str: 9})).toBe(0);
+        expect(jsonParse(' 1  ', {str: 9})).toBe(1);
+    });
+
+    it('Должен вернуть undefined для не корректных значений', () => {
+        expect(jsonParse()).toBeUndefined();
+        expect(jsonParse('')).toBeUndefined();
+        expect(jsonParse('    ')).toBeUndefined();
+        expect(jsonParse('{"9')).toBeUndefined();
+    });
+
+    it('Должен вернуть дефолтное значение', () => {
+        expect(jsonParse(undefined, 'to')).toBe('to');
+        expect(jsonParse('', 'to')).toBe('to');
+        expect(jsonParse('      ', 'to')).toBe('to');
+        expect(jsonParse('./6dh', 9)).toBe(9);
+    });
+});
diff --git a/src/core/utils/jsonParse.ts b/src/core/utils/jsonParse.ts
new file mode 100644
index 0000000..73f2176
--- /dev/null
+++ b/src/core/utils/jsonParse.ts
@@ -0,0 +1,10 @@
+export const jsonParse = <T>(str?: string, defaultValue?: T): Undefinable<T> => {
+    const trimStr = str?.trim();
+    try {
+        const parsedValue = JSON.parse(trimStr ?? '');
+
+        return parsedValue === undefined ? defaultValue : parsedValue;
+    } catch (e) {
+        return defaultValue;
+    }
+};
diff --git a/src/core/utils/jsonStringify.ts b/src/core/utils/jsonStringify.ts
new file mode 100644
index 0000000..4c2c702
--- /dev/null
+++ b/src/core/utils/jsonStringify.ts
@@ -0,0 +1,3 @@
+export const jsonStringify = <T>(obj: T, space = 4): string => (
+    JSON.stringify(obj, null, space)
+);