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castUtil.go
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castUtil.go
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// Copyright 2018 Istio Authors.
//
// 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 yaml
import "strconv"
// ToFloat type casts input to float64 if it is possible.
func ToFloat(v interface{}) (float64, bool) {
switch c := v.(type) {
case float32:
return float64(c), true
case float64:
return c, true
default:
// depending on the parser, `v` can be an integer if user does not explicitly append the value with `.0`.
// For example user writes `3` instead of `3.0`. Below case takes care of treating integer
// as float64.
if d, ok := ToInt64(v); ok {
return float64(d), true
}
return 0, false
}
}
// ToInt64 type casts input to int64 if it is possible.
func ToInt64(v interface{}) (int64, bool) {
switch c := v.(type) {
case int:
return int64(c), true
case int8:
return int64(c), true
case int16:
return int64(c), true
case int32:
return int64(c), true
case int64:
return c, true
case float64:
// json only supports 'number'
// therefore even integers are encoded as float
ii := int64(c)
return ii, float64(ii) == c
case string:
ii, err := strconv.ParseInt(c, 0, 64)
return ii, err == nil
default:
return 0, false
}
}