110 lines
2.9 KiB
Go
110 lines
2.9 KiB
Go
// Copyright (c) 2025 Probo Inc <hello@getprobo.com>.
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//
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// Permission to use, copy, modify, and/or distribute this software for any
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// purpose with or without fee is hereby granted, provided that the above
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// copyright notice and this permission notice appear in all copies.
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//
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// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
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// REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
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// AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
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// INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
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// LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
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// OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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// PERFORMANCE OF THIS SOFTWARE.
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package validator
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import (
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"fmt"
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"reflect"
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)
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// MinItems validates that a slice or array has at least the specified minimum number of items.
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func MinItems(min int) ValidatorFunc {
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return func(value any) *ValidationError {
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v := reflect.ValueOf(value)
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if v.Kind() == reflect.Ptr {
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if v.IsNil() {
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return nil
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}
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v = v.Elem()
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}
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if v.Kind() != reflect.Slice && v.Kind() != reflect.Array {
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return newValidationError(ErrorCodeInvalidFormat, "value must be a slice or array")
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}
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if v.Len() < min {
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return newValidationError(
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ErrorCodeOutOfRange,
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fmt.Sprintf("must contain at least %d items", min),
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)
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}
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return nil
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}
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}
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// MaxItems validates that a slice or array does not exceed the specified maximum number of items.
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func MaxItems(max int) ValidatorFunc {
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return func(value any) *ValidationError {
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v := reflect.ValueOf(value)
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if v.Kind() == reflect.Ptr {
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if v.IsNil() {
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return nil
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}
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v = v.Elem()
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}
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if v.Kind() != reflect.Slice && v.Kind() != reflect.Array {
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return newValidationError(ErrorCodeInvalidFormat, "value must be a slice or array")
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}
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if v.Len() > max {
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return newValidationError(
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ErrorCodeOutOfRange,
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fmt.Sprintf("must contain at most %d items", max),
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)
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}
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return nil
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}
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}
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// UniqueItems validates that all items in a slice or array are unique.
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func UniqueItems() ValidatorFunc {
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return func(value any) *ValidationError {
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v := reflect.ValueOf(value)
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if v.Kind() == reflect.Ptr {
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if v.IsNil() {
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return nil
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}
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v = v.Elem()
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}
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if v.Kind() != reflect.Slice && v.Kind() != reflect.Array {
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return newValidationError(ErrorCodeInvalidFormat, "value must be a slice or array")
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}
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if v.Len() == 0 {
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return nil
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}
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elemType := v.Type().Elem()
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if !elemType.Comparable() {
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return newValidationError(ErrorCodeInvalidFormat, "cannot validate uniqueness for non-comparable types")
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}
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seen := make(map[any]bool)
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for i := 0; i < v.Len(); i++ {
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item := v.Index(i).Interface()
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if seen[item] {
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return newValidationError(ErrorCodeInvalidFormat, "items must be unique")
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}
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seen[item] = true
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}
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return nil
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}
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}
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