forked from ebhomengo/niki
43 lines
1.3 KiB
Go
43 lines
1.3 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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import "errors"
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// Required is a validation rule that checks if a value is not empty.
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// A value is considered not empty if
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// - integer, float: not zero
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// - bool: true
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// - string, array, slice, map: len() > 0
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// - interface, pointer: not nil and the referenced value is not empty
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// - any other types
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var Required = &requiredRule{message: "cannot be blank", skipNil: false}
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// NilOrNotEmpty checks if a value is a nil pointer or a value that is not empty.
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// NilOrNotEmpty differs from Required in that it treats a nil pointer as valid.
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var NilOrNotEmpty = &requiredRule{message: "cannot be blank", skipNil: true}
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type requiredRule struct {
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message string
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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 (v *requiredRule) Validate(value interface{}) error {
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value, isNil := Indirect(value)
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if v.skipNil && !isNil && IsEmpty(value) || !v.skipNil && (isNil || IsEmpty(value)) {
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return errors.New(v.message)
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}
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return nil
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}
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// Error sets the error message for the rule.
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func (v *requiredRule) Error(message string) *requiredRule {
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return &requiredRule{
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message: message,
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skipNil: v.skipNil,
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}
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}
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