mirror of
https://github.com/tailscale/tailscale.git
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134 lines
2.7 KiB
Go
134 lines
2.7 KiB
Go
// Copyright (c) Tailscale Inc & AUTHORS
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// SPDX-License-Identifier: BSD-3-Clause
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// Package opt defines optional types.
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package opt
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import (
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"fmt"
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"strconv"
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)
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// Bool represents an optional boolean to be JSON-encoded. The string
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// is either "true", "false", or the empty string to mean unset.
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//
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// As a special case, the underlying string may also be the string
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// "unset" as as a synonym for the empty string. This lets the
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// explicit unset value be exchanged over an encoding/json "omitempty"
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// field without it being dropped.
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type Bool string
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// NewBool constructs a new Bool value equal to b. The returned Bool is set,
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// unless Set("") or Clear() methods are called.
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func NewBool(b bool) Bool {
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return Bool(strconv.FormatBool(b))
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}
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func (b *Bool) Set(v bool) {
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*b = Bool(strconv.FormatBool(v))
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}
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func (b *Bool) Clear() { *b = "" }
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func (b Bool) Get() (v bool, ok bool) {
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switch b {
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case "true":
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return true, true
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case "false":
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return false, true
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default:
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return false, false
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}
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}
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// Scan implements database/sql.Scanner.
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func (b *Bool) Scan(src any) error {
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if src == nil {
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*b = ""
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return nil
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}
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switch src := src.(type) {
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case bool:
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if src {
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*b = "true"
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} else {
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*b = "false"
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}
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return nil
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case int64:
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if src == 0 {
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*b = "false"
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} else {
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*b = "true"
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}
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return nil
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default:
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return fmt.Errorf("opt.Bool.Scan: invalid type %T: %v", src, src)
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}
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}
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// EqualBool reports whether b is equal to v.
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// If b is empty or not a valid bool, it reports false.
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func (b Bool) EqualBool(v bool) bool {
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p, ok := b.Get()
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return ok && p == v
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}
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var (
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trueBytes = []byte("true")
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falseBytes = []byte("false")
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nullBytes = []byte("null")
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)
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func (b Bool) MarshalJSON() ([]byte, error) {
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switch b {
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case "true":
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return trueBytes, nil
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case "false":
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return falseBytes, nil
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case "", "unset":
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return nullBytes, nil
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}
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return nil, fmt.Errorf("invalid opt.Bool value %q", string(b))
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}
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func (b *Bool) UnmarshalJSON(j []byte) error {
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switch string(j) {
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case "true":
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*b = "true"
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case "false":
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*b = "false"
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case "null":
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*b = "unset"
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default:
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return fmt.Errorf("invalid opt.Bool value %q", j)
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}
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return nil
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}
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// BoolFlag is a wrapper for Bool that implements [flag.Value].
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type BoolFlag struct {
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*Bool
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}
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// Set the value of b, using any value supported by [strconv.ParseBool].
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func (b *BoolFlag) Set(s string) error {
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v, err := strconv.ParseBool(s)
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if err != nil {
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return err
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}
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b.Bool.Set(v)
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return nil
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}
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// String returns "true" or "false" if the value is set, or an empty string otherwise.
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func (b *BoolFlag) String() string {
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if b == nil || b.Bool == nil {
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return ""
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}
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if v, ok := b.Bool.Get(); ok {
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return strconv.FormatBool(v)
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}
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return ""
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}
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