func (p *prefixParserLoader) loadPossibleEnvironmentVariable(envVar string) (config.Key, string) {
equalIndex := strings.Index(envVar, Equal)
key, value := envVar[:equalIndex], envVar[equalIndex+1:]
if !strings.HasPrefix(key, p.prefix) {
return config.Key(nil), ""
}
key = strings.TrimPrefix(key, p.prefix)
return p.parser.Parse(key), value
}
//LoadReader uses l's settings and a encoding/json.Decoder to parse Values from in.
//If the call to encoding/json.Decoder.Decode() returns an error, then that error
//is returned with nil *Values.
//in must represent a JSON encoded object. Any other type will error.
//
//Notice that LoadReader is a config.ReaderFuncLoader and it is used in this manner
//in the examples.
func (l *Loader) LoadReader(in io.Reader) (*config.Values, error) {
object, err := parseJson(in)
if err != nil {
return nil, err
}
values := config.NewValues()
l.loadMapIntoValues(config.Key(nil), values, object)
return values, nil
}