| // Copyright (c) 2020 Nikita Pekin and the lazycell contributors |
| // See the README.md file at the top-level directory of this distribution. |
| // |
| // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or |
| // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license |
| // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your |
| // option. This file may not be copied, modified, or distributed |
| // except according to those terms.use serde::ser::{Serialize, Serializer}; |
| use serde::ser::{Serialize, Serializer}; |
| use serde::de::{self, Deserialize, Deserializer, Visitor}; |
| |
| use std::fmt; |
| use std::marker::PhantomData; |
| |
| use super::{LazyCell, AtomicLazyCell}; |
| |
| impl<T: Serialize> Serialize for LazyCell<T> { |
| fn serialize<S: Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error> { |
| match self.borrow() { |
| Some(val) => serializer.serialize_some(val), |
| None => serializer.serialize_none() |
| } |
| } |
| } |
| |
| |
| impl<T: Serialize> Serialize for AtomicLazyCell<T> { |
| fn serialize<S: Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error> { |
| match self.borrow() { |
| Some(val) => serializer.serialize_some(val), |
| None => serializer.serialize_none() |
| } |
| } |
| } |
| |
| struct LazyCellVisitor<T>(PhantomData<*const T>); |
| impl<'de, T: Deserialize<'de>> Visitor<'de> for LazyCellVisitor<T> { |
| type Value = LazyCell<T>; |
| |
| fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { |
| formatter.write_str("a LazyCell") |
| } |
| |
| fn visit_some<D: Deserializer<'de>>(self, deserializer: D) -> Result<Self::Value, D::Error> { |
| let mut cell = LazyCell::new(); |
| cell.replace(T::deserialize(deserializer)?); |
| Ok(cell) |
| } |
| |
| fn visit_none<E: de::Error>(self) -> Result<Self::Value, E> { |
| Ok(LazyCell::new()) |
| } |
| } |
| |
| impl<'de, T: Deserialize<'de>> Deserialize<'de> for LazyCell<T> { |
| fn deserialize<D: Deserializer<'de>>(deserializer: D) -> Result<Self, D::Error> { |
| deserializer.deserialize_option(LazyCellVisitor(PhantomData)) |
| } |
| } |
| |
| |
| struct AtomicLazyCellVisitor<T>(PhantomData<*const T>); |
| impl<'de, T: Deserialize<'de>> Visitor<'de> for AtomicLazyCellVisitor<T> { |
| type Value = AtomicLazyCell<T>; |
| |
| fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { |
| formatter.write_str("an AtomicLazyCell") |
| } |
| |
| fn visit_some<D: Deserializer<'de>>(self, deserializer: D) -> Result<Self::Value, D::Error> { |
| let mut cell = AtomicLazyCell::new(); |
| cell.replace(T::deserialize(deserializer)?); |
| Ok(cell) |
| } |
| |
| fn visit_none<E: de::Error>(self) -> Result<Self::Value, E> { |
| Ok(AtomicLazyCell::new()) |
| } |
| } |
| |
| |
| impl<'de, T: Deserialize<'de>> Deserialize<'de> for AtomicLazyCell<T> { |
| fn deserialize<D: Deserializer<'de>>(deserializer: D) -> Result<Self, D::Error> { |
| deserializer.deserialize_option(AtomicLazyCellVisitor(PhantomData)) |
| } |
| } |