vendor/google.golang.org/api/gensupport/jsonfloat.go


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// Copyright 2016 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package gensupport

import (
    "encoding/json"
    "errors"
    "fmt"
    "math"
)

// JSONFloat64 is a float64 that supports proper unmarshaling of special float
// values in JSON, according to
// https://developers.google.com/protocol-buffers/docs/proto3#json. Although
// that is a proto-to-JSON spec, it applies to all Google APIs.
//
// The jsonpb package
// (https://github.com/golang/protobuf/blob/master/jsonpb/jsonpb.go) has
// similar functionality, but only for direct translation from proto messages
// to JSON.
type JSONFloat64 float64

func (f *JSONFloat64) UnmarshalJSON(data []byte) error {
    var ff float64
    if err := json.Unmarshal(data, &ff); err == nil {
        *f = JSONFloat64(ff)
        return nil
    }
    var s string
    if err := json.Unmarshal(data, &s); err == nil {
        switch s {
        case "NaN":
            ff = math.NaN()
        case "Infinity":
            ff = math.Inf(1)
        case "-Infinity":
            ff = math.Inf(-1)
        default:
            return fmt.Errorf("google.golang.org/api/internal: bad float string %q", s)
        }
        *f = JSONFloat64(ff)
        return nil
    }
    return errors.New("google.golang.org/api/internal: data not float or string")
}