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config.go
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/
config.go
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package config
import "reflect"
func allSet(xs ...string) bool {
for i := range xs {
if xs[i] == "" {
return false
}
}
return true
}
func allBlankOrAllSet(xs ...string) bool {
var blanks int
for i := range xs {
if xs[i] == "" {
blanks++
}
}
return blanks == len(xs) || blanks == 0
}
// From src/pkg/encoding/json.
func isEmptyValue(v reflect.Value) bool {
switch v.Kind() {
case reflect.Array, reflect.Map, reflect.Slice, reflect.String:
return v.Len() == 0
case reflect.Bool:
return !v.Bool()
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
return v.Int() == 0
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
return v.Uint() == 0
case reflect.Float32, reflect.Float64:
return v.Float() == 0
case reflect.Interface, reflect.Ptr:
return v.IsNil()
}
return false
}
func merge(dst, src reflect.Value) error {
if !src.IsValid() {
// this means the value is the default value,
// which we don't want to set on dest
return nil
}
switch src.Kind() {
case reflect.Struct:
for i, n := 0, dst.NumField(); i < n; i++ {
err := merge(dst.Field(i), src.Field(i))
if err != nil {
return err
}
}
default:
if dst.CanSet() && !isEmptyValue(src) {
dst.Set(src)
}
}
return nil
}