61 lines
1.4 KiB
Go
61 lines
1.4 KiB
Go
// Copyright (c) 2023-2024 Onur Cinar.
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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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// https://github.com/cinar/checker
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package v2
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import (
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"reflect"
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"strconv"
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)
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const (
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// nameMaxLen is the name of the maximum length check.
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nameMaxLen = "max-len"
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)
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var (
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// ErrMaxLen indicates that the value's length is greater than the specified maximum.
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ErrMaxLen = NewCheckError("NOT_MAX_LEN")
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)
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// MaxLen checks if the length of the given value (string, slice, or map) is at most n.
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// Returns an error if the length is greater than n.
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func MaxLen[T any](n int) CheckFunc[T] {
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return func(value T) (T, error) {
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v, ok := any(value).(reflect.Value)
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if !ok {
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v = reflect.ValueOf(value)
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}
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v = reflect.Indirect(v)
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if v.Len() > n {
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return value, newMaxLenError(n)
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}
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return value, nil
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}
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}
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// makeMaxLen creates a maximum length check function from a string parameter.
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// Panics if the parameter cannot be parsed as an integer.
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func makeMaxLen(params string) CheckFunc[reflect.Value] {
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n, err := strconv.Atoi(params)
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if err != nil {
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panic("unable to parse max length")
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}
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return MaxLen[reflect.Value](n)
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}
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// newMaxLenError creates a new maximum length error with the given maximum length.
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func newMaxLenError(n int) error {
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return NewCheckErrorWithData(
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ErrMaxLen.Code,
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map[string]interface{}{
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"max": n,
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},
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)
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}
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