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35 lines
754 B
35 lines
754 B
package config
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import "strconv"
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// Flag represents a nullable boolean value that is considered null until
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// either parsed from YAML or merged in from another Flag value.
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//
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type Flag struct {
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True bool
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set bool
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}
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// UnmarshalJSON implements json.Unmarshaler to parse the underlying boolean
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// value and detect that the Flag should no longer be considered null.
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//
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func (flag *Flag) UnmarshalJSON(unmarshal []byte) error {
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var err error
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flag.True, err = strconv.ParseBool(string(unmarshal))
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if err != nil {
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return err
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}
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flag.set = true
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return nil
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}
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// Merge takes another flag and, if set, merged its boolean value into this
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// one.
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//
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func (flag *Flag) Merge(flag2 Flag) {
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if flag2.set {
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flag.True = flag2.True
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flag.set = true
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}
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}
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