mirror of
https://github.com/tailscale/tailscale.git
synced 2024-11-26 03:25:35 +00:00
102 lines
2.0 KiB
Go
102 lines
2.0 KiB
Go
// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
|
|
// Use of this source code is governed by a BSD-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
// Package opt defines optional types.
|
|
package opt
|
|
|
|
import (
|
|
"fmt"
|
|
"strconv"
|
|
)
|
|
|
|
// Bool represents an optional boolean to be JSON-encoded.
|
|
// The string can be empty (for unknown or unspecified), or
|
|
// "true" or "false".
|
|
type Bool string
|
|
|
|
func (b *Bool) Set(v bool) {
|
|
*b = Bool(strconv.FormatBool(v))
|
|
}
|
|
|
|
func (b *Bool) Clear() { *b = "" }
|
|
|
|
func (b Bool) Get() (v bool, ok bool) {
|
|
if b == "" {
|
|
return
|
|
}
|
|
v, err := strconv.ParseBool(string(b))
|
|
return v, err == nil
|
|
}
|
|
|
|
// Scan implements database/sql.Scanner.
|
|
func (b *Bool) Scan(src any) error {
|
|
if src == nil {
|
|
*b = ""
|
|
return nil
|
|
}
|
|
switch src := src.(type) {
|
|
case bool:
|
|
if src {
|
|
*b = "true"
|
|
} else {
|
|
*b = "false"
|
|
}
|
|
return nil
|
|
case int64:
|
|
if src == 0 {
|
|
*b = "false"
|
|
} else {
|
|
*b = "true"
|
|
}
|
|
return nil
|
|
default:
|
|
return fmt.Errorf("opt.Bool.Scan: invalid type %T: %v", src, src)
|
|
}
|
|
}
|
|
|
|
// EqualBool reports whether b is equal to v.
|
|
// If b is empty or not a valid bool, it reports false.
|
|
func (b Bool) EqualBool(v bool) bool {
|
|
p, ok := b.Get()
|
|
return ok && p == v
|
|
}
|
|
|
|
var (
|
|
trueBytes = []byte("true")
|
|
falseBytes = []byte("false")
|
|
nullBytes = []byte("null")
|
|
)
|
|
|
|
func (b Bool) MarshalJSON() ([]byte, error) {
|
|
switch b {
|
|
case "true":
|
|
return trueBytes, nil
|
|
case "false":
|
|
return falseBytes, nil
|
|
case "":
|
|
return nullBytes, nil
|
|
}
|
|
return nil, fmt.Errorf("invalid opt.Bool value %q", string(b))
|
|
}
|
|
|
|
func (b *Bool) UnmarshalJSON(j []byte) error {
|
|
// Note: written with a bunch of ifs instead of a switch
|
|
// because I'm sure the Go compiler optimizes away these
|
|
// []byte->string allocations in an == comparison, but I'm too
|
|
// lazy to check whether that's true in a switch also.
|
|
if string(j) == "true" {
|
|
*b = "true"
|
|
return nil
|
|
}
|
|
if string(j) == "false" {
|
|
*b = "false"
|
|
return nil
|
|
}
|
|
if string(j) == "null" {
|
|
*b = ""
|
|
return nil
|
|
}
|
|
return fmt.Errorf("invalid opt.Bool value %q", j)
|
|
}
|