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Move getPath from expect/utils to jest-util
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
|
|
@@ -17,6 +17,7 @@ | |
| "license": "MIT", | ||
| "dependencies": { | ||
| "chalk": "^2.0.1", | ||
| "jest-util": "^23.1.0", | ||
| "pretty-format": "^23.0.1" | ||
| } | ||
| } | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,79 @@ | ||
| import getPath from '../get_path'; | ||
|
|
||
| describe('getPath()', () => { | ||
| test('property exists', () => { | ||
| expect(getPath({a: {b: {c: 5}}}, 'a.b.c')).toEqual({ | ||
| hasEndProp: true, | ||
| lastTraversedObject: {c: 5}, | ||
| traversedPath: ['a', 'b', 'c'], | ||
| value: 5, | ||
| }); | ||
|
|
||
| expect(getPath({a: {b: {c: {d: 1}}}}, 'a.b.c.d')).toEqual({ | ||
| hasEndProp: true, | ||
| lastTraversedObject: {d: 1}, | ||
| traversedPath: ['a', 'b', 'c', 'd'], | ||
| value: 1, | ||
| }); | ||
| }); | ||
|
|
||
| test('property doesnt exist', () => { | ||
| expect(getPath({a: {b: {}}}, 'a.b.c')).toEqual({ | ||
| hasEndProp: false, | ||
| lastTraversedObject: {}, | ||
| traversedPath: ['a', 'b'], | ||
| value: undefined, | ||
| }); | ||
| }); | ||
|
|
||
| test('property exist but undefined', () => { | ||
| expect(getPath({a: {b: {c: undefined}}}, 'a.b.c')).toEqual({ | ||
| hasEndProp: true, | ||
| lastTraversedObject: {c: undefined}, | ||
| traversedPath: ['a', 'b', 'c'], | ||
| value: undefined, | ||
| }); | ||
| }); | ||
|
|
||
| test('property is a getter on class instance', () => { | ||
| class A { | ||
| get a() { | ||
| return 'a'; | ||
| } | ||
| get b() { | ||
| return {c: 'c'}; | ||
| } | ||
| } | ||
|
|
||
| expect(getPath(new A(), 'a')).toEqual({ | ||
| hasEndProp: true, | ||
| lastTraversedObject: new A(), | ||
| traversedPath: ['a'], | ||
| value: 'a', | ||
| }); | ||
| expect(getPath(new A(), 'b.c')).toEqual({ | ||
| hasEndProp: true, | ||
| lastTraversedObject: {c: 'c'}, | ||
| traversedPath: ['b', 'c'], | ||
| value: 'c', | ||
| }); | ||
| }); | ||
|
|
||
| test('path breaks', () => { | ||
| expect(getPath({a: {}}, 'a.b.c')).toEqual({ | ||
| hasEndProp: false, | ||
| lastTraversedObject: {}, | ||
| traversedPath: ['a'], | ||
| value: undefined, | ||
| }); | ||
| }); | ||
|
|
||
| test('empty object at the end', () => { | ||
| expect(getPath({a: {b: {c: {}}}}, 'a.b.c.d')).toEqual({ | ||
| hasEndProp: false, | ||
| lastTraversedObject: {}, | ||
| traversedPath: ['a', 'b', 'c'], | ||
| value: undefined, | ||
| }); | ||
| }); | ||
| }); |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,61 @@ | ||
| type GetPath = { | ||
| hasEndProp?: boolean, | ||
| lastTraversedObject: ?Object, | ||
| traversedPath: Array<string>, | ||
| value?: any, | ||
| }; | ||
|
|
||
| const hasOwnProperty = (object: Object, value: string) => | ||
| Object.prototype.hasOwnProperty.call(object, value) || | ||
| Object.prototype.hasOwnProperty.call(object.constructor.prototype, value); | ||
|
|
||
| const getPath = ( | ||
| object: Object, | ||
| propertyPath: string | Array<string>, | ||
| ): GetPath => { | ||
| if (!Array.isArray(propertyPath)) { | ||
| propertyPath = propertyPath.split('.'); | ||
| } | ||
|
|
||
| if (propertyPath.length) { | ||
| const lastProp = propertyPath.length === 1; | ||
| const prop = propertyPath[0]; | ||
| const newObject = object[prop]; | ||
|
|
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| if (!lastProp && (newObject === null || newObject === undefined)) { | ||
| // This is not the last prop in the chain. If we keep recursing it will | ||
| // hit a `can't access property X of undefined | null`. At this point we | ||
| // know that the chain has broken and we can return right away. | ||
| return { | ||
| hasEndProp: false, | ||
| lastTraversedObject: object, | ||
| traversedPath: [], | ||
| }; | ||
| } | ||
|
|
||
| const result = getPath(newObject, propertyPath.slice(1)); | ||
|
|
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| if (result.lastTraversedObject === null) { | ||
| result.lastTraversedObject = object; | ||
| } | ||
|
|
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| result.traversedPath.unshift(prop); | ||
|
|
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| if (lastProp) { | ||
| result.hasEndProp = hasOwnProperty(object, prop); | ||
| if (!result.hasEndProp) { | ||
| result.traversedPath.shift(); | ||
| } | ||
| } | ||
|
|
||
| return result; | ||
| } | ||
|
|
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| return { | ||
| lastTraversedObject: null, | ||
| traversedPath: [], | ||
| value: object, | ||
| }; | ||
| }; | ||
|
|
||
| export default getPath; |
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