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//go:build appengine || gopherjs || purego
// +build appengine gopherjs purego
// NB: other environments where unsafe is unappropriate should use "purego" build tag
// https://github.com/golang/go/issues/23172
package desc
type jsonNameMap struct{}
type memoizedDefault struct{}
// FindFieldByJSONName finds the field with the given JSON field name. If no such
// field exists then nil is returned. Only regular fields are returned, not
// extensions.
func (md *MessageDescriptor) FindFieldByJSONName(jsonName string) *FieldDescriptor {
// NB: With allowed use of unsafe, we use it to atomically define an index
// via atomic.LoadPointer/atomic.StorePointer. Without it, we skip the index
// and must do a linear scan of fields each time.
for _, f := range md.fields {
jn := f.GetJSONName()
if jn == jsonName {
return f
}
}
return nil
}
func (fd *FieldDescriptor) getDefaultValue() interface{} {
return fd.determineDefault()
}
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