1// Copyright 2016 Google LLC
2//
3// Licensed under the Apache License, Version 2.0 (the "License");
4// you may not use this file except in compliance with the License.
5// You may obtain a copy of the License at
6//
7//      http://www.apache.org/licenses/LICENSE-2.0
8//
9// Unless required by applicable law or agreed to in writing, software
10// distributed under the License is distributed on an "AS IS" BASIS,
11// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12// See the License for the specific language governing permissions and
13// limitations under the License.
14
15package gensupport
16
17import (
18	"encoding/json"
19	"errors"
20	"fmt"
21	"math"
22)
23
24// JSONFloat64 is a float64 that supports proper unmarshaling of special float
25// values in JSON, according to
26// https://developers.google.com/protocol-buffers/docs/proto3#json. Although
27// that is a proto-to-JSON spec, it applies to all Google APIs.
28//
29// The jsonpb package
30// (https://github.com/golang/protobuf/blob/master/jsonpb/jsonpb.go) has
31// similar functionality, but only for direct translation from proto messages
32// to JSON.
33type JSONFloat64 float64
34
35func (f *JSONFloat64) UnmarshalJSON(data []byte) error {
36	var ff float64
37	if err := json.Unmarshal(data, &ff); err == nil {
38		*f = JSONFloat64(ff)
39		return nil
40	}
41	var s string
42	if err := json.Unmarshal(data, &s); err == nil {
43		switch s {
44		case "NaN":
45			ff = math.NaN()
46		case "Infinity":
47			ff = math.Inf(1)
48		case "-Infinity":
49			ff = math.Inf(-1)
50		default:
51			return fmt.Errorf("google.golang.org/api/internal: bad float string %q", s)
52		}
53		*f = JSONFloat64(ff)
54		return nil
55	}
56	return errors.New("google.golang.org/api/internal: data not float or string")
57}
58