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// 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
}
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