func extractType(ctx context.Context, in system.Packed, rule *system.RuleWrapper) (*system.Type, error) {
parentInterface := rule != nil && rule.Parent != nil && rule.Parent.Interface
ruleInterface := rule != nil && rule.Struct != nil && rule.Struct.Interface
if parentInterface && ruleInterface {
return nil, kerr.New("TDXTPGVFAK", "Can't have interface type and interface rule at the same time")
}
if rule != nil && rule.Parent != nil && !parentInterface && !ruleInterface {
// If we have a rule with the parent, and it's not an interface, then
// we just return the parent type of the rule.
return rule.Parent, nil
}
// if the rule is nil (e.g. unpacking into an unknown type) or the type is
// an interface, we ensure the input is a map
if rule == nil || parentInterface {
if in == nil {
return nil, nil
}
switch in.Type() {
case system.J_NULL:
// item is nil, so we don't know the concrete type yet.
return nil, nil
case system.J_MAP:
break
default:
return nil, kerr.New("DLSQRFLINL", "Input %s should be J_MAP if rule is nil or an interface type", in.Type())
}
}
// if the rule is an interface rule, we ensure the input is a map or a native value
if ruleInterface {
if in == nil {
return nil, nil
}
switch in.Type() {
case system.J_NULL:
// item is nil, so we don't know the concrete type yet.
return nil, nil
case system.J_MAP:
break
case system.J_STRING, system.J_NUMBER, system.J_BOOL:
// if the input value is a native value, we will be unpacking into
// the parent type of the rule
return rule.Parent, nil
default:
return nil, kerr.New("SNYLGBJYTM", "Input %s should be J_MAP, J_STRING, J_NUMBER or J_BOOL if rule is interface rule", in.Type())
}
}
ob := in.Map()
typeField, ok := ob["type"]
if !ok {
return nil, kerr.New("HBJVDKAKBJ", "Input must have type field if rule is nil or an interface type")
}
var r system.Reference
if err := r.Unpack(ctx, typeField, false); err != nil {
return nil, kerr.Wrap("YXHGIBXCOC", err)
}
t, ok := r.GetType(ctx)
if !ok {
return nil, kerr.New("IJFMJJWVCA", "Could not find type %s", r.Value())
}
return t, nil
}
