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Source files keep their SPDX-License-Identifier and Hanzo copyright line; the Gitea, Gogs and LFS Test Server copyrights they used to repeat now live once in NOTICE, alongside LICENSE. The header lint accepts any copyright line above the SPDX line, so it no longer demands an upstream one. Co-authored-by: Hanzo Dev <[email protected]>
84 lines
1.7 KiB
Go
84 lines
1.7 KiB
Go
// Copyright 2026 Hanzo AI, Inc. 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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func AssignPtrValue[T comparable](changed *bool, target, src *T) {
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if src != nil && *src != *target {
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*target = *src
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*changed = true
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}
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}
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func AssignPtrString[TO, FROM ~string](changed *bool, target *TO, src *FROM) {
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if src != nil && string(*src) != string(*target) {
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*target = TO(*src)
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*changed = true
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}
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}
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