78 lines
1.9 KiB
Rust
78 lines
1.9 KiB
Rust
use serde::{ser::Error, Deserialize, Deserializer, Serialize, Serializer};
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#[derive(Clone, Debug, PartialEq, Eq)]
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pub enum OptionSerializer<T> {
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Some(T),
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None,
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Skip,
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}
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impl<T> OptionSerializer<T> {
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pub fn none() -> Self {
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Self::None
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}
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pub fn skip() -> Self {
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Self::Skip
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}
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pub fn should_skip(&self) -> bool {
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matches!(self, Self::Skip)
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}
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pub fn or_skip(option: Option<T>) -> Self {
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match option {
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Option::Some(item) => Self::Some(item),
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Option::None => Self::Skip,
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}
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}
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pub fn as_ref(&self) -> OptionSerializer<&T> {
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match self {
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OptionSerializer::Some(item) => OptionSerializer::Some(item),
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OptionSerializer::None => OptionSerializer::None,
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OptionSerializer::Skip => OptionSerializer::Skip,
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}
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}
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}
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impl<T> From<Option<T>> for OptionSerializer<T> {
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fn from(option: Option<T>) -> Self {
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match option {
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Option::Some(item) => Self::Some(item),
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Option::None => Self::None,
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}
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}
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}
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impl<T> From<OptionSerializer<T>> for Option<T> {
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fn from(option: OptionSerializer<T>) -> Self {
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match option {
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OptionSerializer::Some(item) => Self::Some(item),
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_ => Self::None,
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}
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}
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}
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impl<T: Serialize> Serialize for OptionSerializer<T> {
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fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
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where
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S: Serializer,
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{
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match self {
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Self::Some(item) => item.serialize(serializer),
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Self::None => serializer.serialize_none(),
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Self::Skip => Err(Error::custom("Skip variants should not be serialized")),
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}
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}
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}
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impl<'de, T: Deserialize<'de>> Deserialize<'de> for OptionSerializer<T> {
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fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
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where
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D: Deserializer<'de>,
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{
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Option::deserialize(deserializer).map(Into::into)
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}
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}
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