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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
import (
"unicode/utf8"
)
var (
// ErrLengthTooLong is the error that returns in case of too long length.
ErrLengthTooLong = NewError("validation_length_too_long", "the length must be no more than {{.max}}")
// ErrLengthTooShort is the error that returns in case of too short length.
ErrLengthTooShort = NewError("validation_length_too_short", "the length must be no less than {{.min}}")
// ErrLengthInvalid is the error that returns in case of an invalid length.
ErrLengthInvalid = NewError("validation_length_invalid", "the length must be exactly {{.min}}")
// ErrLengthOutOfRange is the error that returns in case of out of range length.
ErrLengthOutOfRange = NewError("validation_length_out_of_range", "the length must be between {{.min}} and {{.max}}")
// ErrLengthEmptyRequired is the error that returns in case of non-empty value.
ErrLengthEmptyRequired = NewError("validation_length_empty_required", "the value must be empty")
)
// Length returns a validation rule that checks if a value's length is within the specified range.
// If max is 0, it means there is no upper bound for the length.
// This rule should only be used for validating strings, slices, maps, and arrays.
// An empty value is considered valid. Use the Required rule to make sure a value is not empty.
func Length(min, max int) LengthRule {
return LengthRule{min: min, max: max, err: buildLengthRuleError(min, max)}
}
// RuneLength returns a validation rule that checks if a string's rune length is within the specified range.
// If max is 0, it means there is no upper bound for the length.
// This rule should only be used for validating strings, slices, maps, and arrays.
// An empty value is considered valid. Use the Required rule to make sure a value is not empty.
// If the value being validated is not a string, the rule works the same as Length.
func RuneLength(min, max int) LengthRule {
r := Length(min, max)
r.rune = true
return r
}
// LengthRule is a validation rule that checks if a value's length is within the specified range.
type LengthRule struct {
err Error
min, max int
rune bool
}
// Validate checks if the given value is valid or not.
func (r LengthRule) Validate(value interface{}) error {
value, isNil := Indirect(value)
if isNil || IsEmpty(value) {
return nil
}
var (
l int
err error
)
if s, ok := value.(string); ok && r.rune {
l = utf8.RuneCountInString(s)
} else if l, err = LengthOfValue(value); err != nil {
return err
}
if r.min > 0 && l < r.min || r.max > 0 && l > r.max || r.min == 0 && r.max == 0 && l > 0 {
return r.err
}
return nil
}
// Error sets the error message for the rule.
func (r LengthRule) Error(message string) LengthRule {
r.err = r.err.SetMessage(message)
return r
}
// ErrorObject sets the error struct for the rule.
func (r LengthRule) ErrorObject(err Error) LengthRule {
r.err = err
return r
}
func buildLengthRuleError(min, max int) (err Error) {
if min == 0 && max > 0 {
err = ErrLengthTooLong
} else if min > 0 && max == 0 {
err = ErrLengthTooShort
} else if min > 0 && max > 0 {
if min == max {
err = ErrLengthInvalid
} else {
err = ErrLengthOutOfRange
}
} else {
err = ErrLengthEmptyRequired
}
return err.SetParams(map[string]interface{}{"min": min, "max": max})
}
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