forked from ebhomengo/niki
105 lines
3.4 KiB
Go
105 lines
3.4 KiB
Go
// 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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"unicode/utf8"
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)
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var (
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// ErrLengthTooLong is the error that returns in case of too long length.
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ErrLengthTooLong = NewError("validation_length_too_long", "the length must be no more than {{.max}}")
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// ErrLengthTooShort is the error that returns in case of too short length.
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ErrLengthTooShort = NewError("validation_length_too_short", "the length must be no less than {{.min}}")
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// ErrLengthInvalid is the error that returns in case of an invalid length.
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ErrLengthInvalid = NewError("validation_length_invalid", "the length must be exactly {{.min}}")
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// ErrLengthOutOfRange is the error that returns in case of out of range length.
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ErrLengthOutOfRange = NewError("validation_length_out_of_range", "the length must be between {{.min}} and {{.max}}")
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// ErrLengthEmptyRequired is the error that returns in case of non-empty value.
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ErrLengthEmptyRequired = NewError("validation_length_empty_required", "the value must be empty")
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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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return LengthRule{min: min, max: max, err: buildLengthRuleError(min, max)}
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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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// LengthRule is a validation rule that checks if a value's length is within the specified range.
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type LengthRule struct {
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err Error
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min, max int
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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 (r 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 && r.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 r.min > 0 && l < r.min || r.max > 0 && l > r.max || r.min == 0 && r.max == 0 && l > 0 {
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return r.err
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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 (r LengthRule) Error(message string) LengthRule {
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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 LengthRule) ErrorObject(err Error) LengthRule {
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r.err = err
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return r
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}
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func buildLengthRuleError(min, max int) (err Error) {
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if min == 0 && max > 0 {
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err = ErrLengthTooLong
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} else if min > 0 && max == 0 {
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err = ErrLengthTooShort
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} else if min > 0 && max > 0 {
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if min == max {
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err = ErrLengthInvalid
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} else {
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err = ErrLengthOutOfRange
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}
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} else {
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err = ErrLengthEmptyRequired
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}
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return err.SetParams(map[string]interface{}{"min": min, "max": max})
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}
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