Function randomJSONValue

property_test.go:45–81

randomJSONValue builds a random nested Go value suitable for encoding/json.Marshal. The shape (depth, breadth, alternatives) is chosen by the supplied RNG so the generator is independent of the parser undertest.

(r *mathrand.Rand, depth int)

// encoding/json.Marshal. The shape (depth, breadth, alternatives) is chosen
// by the supplied RNG so the generator is independent of the parser undertest.
func randomJSONValue(r *mathrand.Rand, depth int) interface{} {
	if depth <= 0 {
		// Leaves: choose a scalar.
		switch r.Intn(6) {
		case 0:
			return r.Int63()
		case 1:
			return r.Float64()
		case 2:
			return r.Intn(2) == 0
		case 3:
			return nil
		case 4:
			return randJSONString(r)
		default:
			return r.Int63()
		}
	}
	switch r.Intn(3) {
	case 0:
		return randJSONString(r)
	case 1:
		n := r.Intn(4) + 1
		arr := make([]interface{}, n)
		for i := range arr {
			arr[i] = randomJSONValue(r, depth-1)
		}
		return arr
	default:
		n := r.Intn(4) + 1
		obj := make(map[string]interface{}, n)
		for i := 0; i < n; i++ {
			obj[randKey(r)] = randomJSONValue(r, depth-1)
		}
		return obj
	}
}

func randKey(r *mathrand.Rand) string {
	letters := "abcdefghijklmnopqrstuvwx"