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package apijson
import "reflect"
type status uint8
const (
missing status = iota
null
invalid
valid
)
type Field struct {
raw string
status status
}
// Returns true if the field is explicitly `null` _or_ if it is not present at all (ie, missing).
// To check if the field's key is present in the JSON with an explicit null value,
// you must check `f.IsNull() && !f.IsMissing()`.
func (j Field) IsNull() bool { return j.status <= null }
func (j Field) IsMissing() bool { return j.status == missing }
func (j Field) IsInvalid() bool { return j.status == invalid }
func (j Field) Raw() string { return j.raw }
func getSubField(root reflect.Value, index []int, name string) reflect.Value {
strct := root.FieldByIndex(index[:len(index)-1])
if !strct.IsValid() {
panic("couldn't find encapsulating struct for field " + name)
}
meta := strct.FieldByName("JSON")
if !meta.IsValid() {
return reflect.Value{}
}
field := meta.FieldByName(name)
if !field.IsValid() {
return reflect.Value{}
}
return field
}
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