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57 lines
1.2 KiB
Rust
57 lines
1.2 KiB
Rust
// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
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use deno_core::v8;
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use deno_core::FromV8;
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use deno_core::ToV8;
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#[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
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/// A wrapper type for `Option<T>` that (de)serializes `None` as `null`
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#[repr(transparent)]
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pub struct OptionNull<T>(pub Option<T>);
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impl<T> From<Option<T>> for OptionNull<T> {
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fn from(option: Option<T>) -> Self {
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Self(option)
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}
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}
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impl<T> From<OptionNull<T>> for Option<T> {
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fn from(value: OptionNull<T>) -> Self {
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value.0
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}
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}
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impl<'a, T> ToV8<'a> for OptionNull<T>
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where
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T: ToV8<'a>,
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{
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type Error = T::Error;
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fn to_v8(
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self,
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scope: &mut v8::HandleScope<'a>,
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) -> Result<v8::Local<'a, v8::Value>, Self::Error> {
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match self.0 {
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Some(value) => value.to_v8(scope),
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None => Ok(v8::null(scope).into()),
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}
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}
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}
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impl<'a, T> FromV8<'a> for OptionNull<T>
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where
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T: FromV8<'a>,
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{
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type Error = T::Error;
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fn from_v8(
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scope: &mut v8::HandleScope<'a>,
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value: v8::Local<'a, v8::Value>,
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) -> Result<Self, Self::Error> {
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if value.is_null() {
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Ok(OptionNull(None))
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} else {
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T::from_v8(scope, value).map(|v| OptionNull(Some(v)))
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}
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}
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}
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