forked from ebhomengo/niki
82 lines
2.3 KiB
Go
82 lines
2.3 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 (
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"errors"
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"fmt"
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"unicode/utf8"
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)
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// Length returns a validation rule that checks if a value's length is within the specified range.
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// If max is 0, it means there is no upper bound for the length.
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// This rule should only be used for validating strings, slices, maps, and arrays.
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// An empty value is considered valid. Use the Required rule to make sure a value is not empty.
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func Length(min, max int) *LengthRule {
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message := "the value must be empty"
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if min == 0 && max > 0 {
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message = fmt.Sprintf("the length must be no more than %v", max)
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} else if min > 0 && max == 0 {
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message = fmt.Sprintf("the length must be no less than %v", min)
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} else if min > 0 && max > 0 {
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if min == max {
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message = fmt.Sprintf("the length must be exactly %v", min)
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} else {
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message = fmt.Sprintf("the length must be between %v and %v", min, max)
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}
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}
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return &LengthRule{
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min: min,
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max: max,
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message: message,
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}
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}
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// RuneLength returns a validation rule that checks if a string's rune length is within the specified range.
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// If max is 0, it means there is no upper bound for the length.
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// This rule should only be used for validating strings, slices, maps, and arrays.
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// An empty value is considered valid. Use the Required rule to make sure a value is not empty.
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// If the value being validated is not a string, the rule works the same as Length.
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func RuneLength(min, max int) *LengthRule {
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r := Length(min, max)
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r.rune = true
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return r
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}
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type LengthRule struct {
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min, max int
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message string
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rune 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 *LengthRule) Validate(value interface{}) error {
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value, isNil := Indirect(value)
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if isNil || IsEmpty(value) {
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return nil
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}
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var (
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l int
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err error
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)
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if s, ok := value.(string); ok && v.rune {
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l = utf8.RuneCountInString(s)
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} else if l, err = LengthOfValue(value); err != nil {
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return err
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}
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if v.min > 0 && l < v.min || v.max > 0 && l > v.max {
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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 *LengthRule) Error(message string) *LengthRule {
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v.message = message
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return v
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}
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