forked from ebhomengo/niki
68 lines
1.6 KiB
Go
68 lines
1.6 KiB
Go
// Copyright 2016 Qiang Xue. All rights reserved.
|
|
// Use of this source code is governed by a MIT-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
package validation
|
|
|
|
var (
|
|
// ErrNil is the error that returns when a value is not nil.
|
|
ErrNil = NewError("validation_nil", "must be blank")
|
|
// ErrEmpty is the error that returns when a not nil value is not empty.
|
|
ErrEmpty = NewError("validation_empty", "must be blank")
|
|
)
|
|
|
|
// Nil is a validation rule that checks if a value is nil.
|
|
// It is the opposite of NotNil rule
|
|
var Nil = absentRule{condition: true, skipNil: false}
|
|
|
|
// Empty checks if a not nil value is empty.
|
|
var Empty = absentRule{condition: true, skipNil: true}
|
|
|
|
type absentRule struct {
|
|
condition bool
|
|
err Error
|
|
skipNil bool
|
|
}
|
|
|
|
// Validate checks if the given value is valid or not.
|
|
func (r absentRule) Validate(value interface{}) error {
|
|
if r.condition {
|
|
value, isNil := Indirect(value)
|
|
if !r.skipNil && !isNil || r.skipNil && !isNil && !IsEmpty(value) {
|
|
if r.err != nil {
|
|
return r.err
|
|
}
|
|
if r.skipNil {
|
|
return ErrEmpty
|
|
}
|
|
return ErrNil
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// When sets the condition that determines if the validation should be performed.
|
|
func (r absentRule) When(condition bool) absentRule {
|
|
r.condition = condition
|
|
return r
|
|
}
|
|
|
|
// Error sets the error message for the rule.
|
|
func (r absentRule) Error(message string) absentRule {
|
|
if r.err == nil {
|
|
if r.skipNil {
|
|
r.err = ErrEmpty
|
|
} else {
|
|
r.err = ErrNil
|
|
}
|
|
}
|
|
r.err = r.err.SetMessage(message)
|
|
return r
|
|
}
|
|
|
|
// ErrorObject sets the error struct for the rule.
|
|
func (r absentRule) ErrorObject(err Error) absentRule {
|
|
r.err = err
|
|
return r
|
|
}
|