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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// nameMinLen is the name of the minimum length check.
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nameMinLen = "min-len"
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)
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var (
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// ErrMinLen indicates that the value's length is less than the specified minimum.
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ErrMinLen = NewCheckError("NOT_MIN_LEN")
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)
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// MinLen checks if the length of the given value (string, slice, or map) is at least n.
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// Returns an error if the length is less than n.
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func MinLen[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, newMinLenError(n)
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}
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return value, nil
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}
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}
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// makeMinLen creates a minimum 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 makeMinLen(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 min length")
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}
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return MinLen[reflect.Value](n)
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}
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// newMinLenError creates a new minimum length error with the given minimum value.
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func newMinLenError(n int) error {
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return NewCheckErrorWithData(
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ErrMinLen.Code,
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map[string]interface{}{
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"min": n,
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},
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)
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}
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