github.skymusic.top/99designs/gqlgen@v0.7.2/graphql/float.go (about)

     1  package graphql
     2  
     3  import (
     4  	"encoding/json"
     5  	"fmt"
     6  	"io"
     7  	"strconv"
     8  )
     9  
    10  func MarshalFloat(f float64) Marshaler {
    11  	return WriterFunc(func(w io.Writer) {
    12  		io.WriteString(w, fmt.Sprintf("%g", f))
    13  	})
    14  }
    15  
    16  func UnmarshalFloat(v interface{}) (float64, error) {
    17  	switch v := v.(type) {
    18  	case string:
    19  		return strconv.ParseFloat(v, 64)
    20  	case int:
    21  		return float64(v), nil
    22  	case int64:
    23  		return float64(v), nil
    24  	case float64:
    25  		return v, nil
    26  	case json.Number:
    27  		return strconv.ParseFloat(string(v), 64)
    28  	default:
    29  		return 0, fmt.Errorf("%T is not an float", v)
    30  	}
    31  }