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maxlength.go
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maxlength.go
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// Package checker is a Go library for validating user input through struct tags.
//
// https://github.com/cinar/checker
//
// Copyright 2023 Onur Cinar. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
//
package checker
import (
"reflect"
"strconv"
)
// CheckerMaxLength is the name of the checker.
const CheckerMaxLength = "max-length"
// ResultNotMaxLength indicates that the length of the given value is above the defined number.
const ResultNotMaxLength = "NOT_MAX_LENGTH"
// IsMaxLength checks if the length of the given value is less than the given maximum length.
func IsMaxLength(value interface{}, maxLength int) Result {
return checkMaxLength(reflect.Indirect(reflect.ValueOf(value)), reflect.ValueOf(nil), maxLength)
}
// makeMaxLength makes a checker function for the max length checker.
func makeMaxLength(config string) CheckFunc {
maxLength, err := strconv.Atoi(config)
if err != nil {
panic("unable to parse max length value")
}
return func(value, parent reflect.Value) Result {
return checkMaxLength(value, parent, maxLength)
}
}
// checkMaxLength checks if the length of the given value is less than the given maximum length.
// The function uses the reflect.Value.Len() function to determaxe the length of the value.
func checkMaxLength(value, _ reflect.Value, maxLength int) Result {
if value.Len() > maxLength {
return ResultNotMaxLength
}
return ResultValid
}