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