andrey
1382bea590
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58 lines
792 B
Go
58 lines
792 B
Go
package setting
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//nolint:gochecknoglobals
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var eparam = empty{}
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func New(opts ...Option) Setting {
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var param Setting
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param = eparam
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for _, opt := range opts {
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param = opt(param)
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}
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return param
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}
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type Setting interface {
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Param(key any) (any, bool)
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With(key, val any) Setting
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}
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type Option func(Setting) Setting
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type empty struct{}
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func (e empty) Param(any) (any, bool) {
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return nil, false
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}
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func (e empty) With(key, val any) Setting {
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return data{
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parent: e,
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key: key,
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val: val,
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}
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}
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type data struct {
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parent Setting
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key, val any
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}
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func (d data) Param(key any) (any, bool) {
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if d.key == key {
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return d.val, true
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}
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return d.parent.Param(key)
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}
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func (d data) With(key, val any) Setting {
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return data{
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parent: d,
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key: key,
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val: val,
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}
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}
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