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