use std::ops::Deref;
use std::marker::PhantomData;
use std::fmt;
use std::hash::Hash;
use serde::ser::{Serialize, SerializeMap, SerializeSeq, Serializer};
use serde::de::{Deserialize, Deserializer, MapAccess, SeqAccess, Visitor};
use hash::SharedHasher;
use list::List;
use conslist::ConsList;
use set::Set;
use queue::Queue;
use map::Map;
use hashmap::HashMap;
struct SeqVisitor<'de, S, A>
where
S: From<Vec<A>>,
A: Deserialize<'de>,
{
phantom_s: PhantomData<S>,
phantom_a: PhantomData<A>,
phantom_lifetime: PhantomData<&'de ()>,
}
impl<'de, S, A> SeqVisitor<'de, S, A>
where
S: From<Vec<A>>,
A: Deserialize<'de>,
{
pub fn new() -> SeqVisitor<'de, S, A> {
SeqVisitor {
phantom_s: PhantomData,
phantom_a: PhantomData,
phantom_lifetime: PhantomData,
}
}
}
impl<'de, S, A> Visitor<'de> for SeqVisitor<'de, S, A>
where
S: From<Vec<A>>,
A: Deserialize<'de>,
{
type Value = S;
fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
formatter.write_str("a sequence")
}
fn visit_seq<Access>(self, mut access: Access) -> Result<Self::Value, Access::Error>
where
Access: SeqAccess<'de>,
{
let mut v: Vec<A> = match access.size_hint() {
None => Vec::new(),
Some(l) => Vec::with_capacity(l),
};
loop {
match access.next_element()? {
Some(i) => v.push(i),
None => break,
}
}
Ok(From::from(v))
}
}
struct MapVisitor<'de, S, K, V>
where
S: From<Vec<(K, V)>>,
K: Deserialize<'de>,
V: Deserialize<'de>,
{
phantom_s: PhantomData<S>,
phantom_k: PhantomData<K>,
phantom_v: PhantomData<V>,
phantom_lifetime: PhantomData<&'de ()>,
}
impl<'de, S, K, V> MapVisitor<'de, S, K, V>
where
S: From<Vec<(K, V)>>,
K: Deserialize<'de>,
V: Deserialize<'de>,
{
pub fn new() -> MapVisitor<'de, S, K, V> {
MapVisitor {
phantom_s: PhantomData,
phantom_k: PhantomData,
phantom_v: PhantomData,
phantom_lifetime: PhantomData,
}
}
}
impl<'de, S, K, V> Visitor<'de> for MapVisitor<'de, S, K, V>
where
S: From<Vec<(K, V)>>,
K: Deserialize<'de>,
V: Deserialize<'de>,
{
type Value = S;
fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
formatter.write_str("a sequence")
}
fn visit_map<Access>(self, mut access: Access) -> Result<Self::Value, Access::Error>
where
Access: MapAccess<'de>,
{
let mut v: Vec<(K, V)> = match access.size_hint() {
None => Vec::new(),
Some(l) => Vec::with_capacity(l),
};
loop {
match access.next_entry()? {
Some(i) => v.push(i),
None => break,
}
}
Ok(From::from(v))
}
}
impl<'de, A: Deserialize<'de>> Deserialize<'de> for List<A> {
fn deserialize<D>(des: D) -> Result<Self, D::Error>
where
D: Deserializer<'de>,
{
des.deserialize_seq(SeqVisitor::<'de, List<A>, A>::new())
}
}
impl<A: Serialize> Serialize for List<A> {
fn serialize<S>(&self, ser: S) -> Result<S::Ok, S::Error>
where
S: Serializer,
{
let mut s = ser.serialize_seq(Some(self.len()))?;
for i in self.iter() {
s.serialize_element(i.deref())?;
}
s.end()
}
}
impl<'de, A: Deserialize<'de>> Deserialize<'de> for ConsList<A> {
fn deserialize<D>(des: D) -> Result<Self, D::Error>
where
D: Deserializer<'de>,
{
des.deserialize_seq(SeqVisitor::<'de, ConsList<A>, A>::new())
}
}
impl<A: Serialize> Serialize for ConsList<A> {
fn serialize<S>(&self, ser: S) -> Result<S::Ok, S::Error>
where
S: Serializer,
{
let mut s = ser.serialize_seq(Some(self.len()))?;
for i in self.iter() {
s.serialize_element(i.deref())?;
}
s.end()
}
}
impl<'de, A: Deserialize<'de> + Ord> Deserialize<'de> for Set<A> {
fn deserialize<D>(des: D) -> Result<Self, D::Error>
where
D: Deserializer<'de>,
{
des.deserialize_seq(SeqVisitor::new())
}
}
impl<A: Serialize> Serialize for Set<A> {
fn serialize<S>(&self, ser: S) -> Result<S::Ok, S::Error>
where
S: Serializer,
{
let mut s = ser.serialize_seq(Some(self.len()))?;
for i in self.iter() {
s.serialize_element(i.deref())?;
}
s.end()
}
}
impl<'de, A: Deserialize<'de> + Ord> Deserialize<'de> for Queue<A> {
fn deserialize<D>(des: D) -> Result<Self, D::Error>
where
D: Deserializer<'de>,
{
des.deserialize_seq(SeqVisitor::<'de, Queue<A>, A>::new())
}
}
impl<A: Serialize> Serialize for Queue<A> {
fn serialize<S>(&self, ser: S) -> Result<S::Ok, S::Error>
where
S: Serializer,
{
let mut s = ser.serialize_seq(Some(self.len()))?;
for i in self.iter() {
s.serialize_element(i.deref())?;
}
s.end()
}
}
impl<'de, K: Deserialize<'de> + Ord, V: Deserialize<'de>> Deserialize<'de> for Map<K, V> {
fn deserialize<D>(des: D) -> Result<Self, D::Error>
where
D: Deserializer<'de>,
{
des.deserialize_map(MapVisitor::<'de, Map<K, V>, K, V>::new())
}
}
impl<K: Serialize + Ord, V: Serialize> Serialize for Map<K, V> {
fn serialize<S>(&self, ser: S) -> Result<S::Ok, S::Error>
where
S: Serializer,
{
let mut s = ser.serialize_map(Some(self.len()))?;
for (k, v) in self.iter() {
s.serialize_entry(k.deref(), v.deref())?;
}
s.end()
}
}
impl<'de, K: Deserialize<'de> + Hash + Eq, V: Deserialize<'de>, S: SharedHasher> Deserialize<'de>
for HashMap<K, V, S> {
fn deserialize<D>(des: D) -> Result<Self, D::Error>
where
D: Deserializer<'de>,
{
des.deserialize_map(MapVisitor::<'de, HashMap<K, V, S>, K, V>::new())
}
}
impl<K: Serialize + Hash + Eq, V: Serialize, S: SharedHasher> Serialize for HashMap<K, V, S> {
fn serialize<Ser>(&self, ser: Ser) -> Result<Ser::Ok, Ser::Error>
where
Ser: Serializer,
{
let mut s = ser.serialize_map(Some(self.len()))?;
for (k, v) in self.iter() {
s.serialize_entry(k.deref(), v.deref())?;
}
s.end()
}
}
#[cfg(test)]
mod test {
use super::*;
use serde_json::{from_str, to_string};
quickcheck! {
fn list(list: List<i32>) -> bool {
from_str::<List<i32>>(&to_string(&list).unwrap()).unwrap() == list
}
fn conslist(list: ConsList<i32>) -> bool {
from_str::<ConsList<i32>>(&to_string(&list).unwrap()).unwrap() == list
}
fn set(list: Set<i32>) -> bool {
from_str::<Set<i32>>(&to_string(&list).unwrap()).unwrap() == list
}
fn queue(list: Queue<i32>) -> bool {
from_str::<Queue<i32>>(&to_string(&list).unwrap()).unwrap() == list
}
fn map(list: Map<i32, i32>) -> bool {
from_str::<Map<i32, i32>>(&to_string(&list).unwrap()).unwrap() == list
}
fn hash_map(list: HashMap<i32, i32>) -> bool {
from_str::<HashMap<i32, i32>>(&to_string(&list).unwrap()).unwrap() == list
}
}
}