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70 lines
1.4 KiB
Go
70 lines
1.4 KiB
Go
// Copyright 2024 The Gitea Authors. All rights reserved.
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// SPDX-License-Identifier: MIT
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package optional
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import "strconv"
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// Option is a generic type that can hold a value of type T or be empty (None).
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//
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// It must use the slice type to work with "chi" form values binding:
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// * non-existing value are represented as an empty slice (None)
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// * existing value is represented as a slice with one element (Some)
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// * multiple values are represented as a slice with multiple elements (Some), the Value is the first element (not well-defined in this case)
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type Option[T any] []T
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func None[T any]() Option[T] {
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return nil
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}
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func Some[T any](v T) Option[T] {
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return Option[T]{v}
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}
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func FromPtr[T any](v *T) Option[T] {
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if v == nil {
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return None[T]()
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}
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return Some(*v)
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}
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func FromMapLookup[K comparable, V any](m map[K]V, k K) Option[V] {
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if v, ok := m[k]; ok {
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return Some(v)
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}
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return None[V]()
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}
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func FromNonDefault[T comparable](v T) Option[T] {
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var zero T
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if v == zero {
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return None[T]()
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}
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return Some(v)
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}
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func (o Option[T]) Has() bool {
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return o != nil
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}
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func (o Option[T]) Value() T {
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var zero T
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return o.ValueOrDefault(zero)
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}
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func (o Option[T]) ValueOrDefault(v T) T {
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if o.Has() {
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return o[0]
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}
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return v
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}
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// ParseBool get the corresponding optional.Option[bool] of a string using strconv.ParseBool
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func ParseBool(s string) Option[bool] {
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v, e := strconv.ParseBool(s)
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if e != nil {
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return None[bool]()
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}
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return Some(v)
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}
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