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use serde::de::{self, DeserializeSeed, Deserializer, MapAccess, Visitor};
use serde::{Deserialize, Serialize};
use std::collections::HashMap;
use std::fmt::{self, Display};
use std::hash::Hash;
use std::marker::PhantomData;
use std::str::FromStr;
#[derive(Serialize, Deserialize, Debug, Clone)]
#[cfg_attr(test, derive(PartialEq))]
pub struct TranslatedString {
pub en: String,
pub nl: String,
}
pub fn de_int_key<'de, D, K, V>(deserializer: D) -> Result<HashMap<K, V>, D::Error>
where
D: Deserializer<'de>,
K: Eq + Hash + FromStr,
K::Err: Display,
V: Deserialize<'de>,
{
struct KeySeed<K> {
k: PhantomData<K>,
}
impl<'de, K> DeserializeSeed<'de> for KeySeed<K>
where
K: FromStr,
K::Err: Display,
{
type Value = K;
fn deserialize<D>(self, deserializer: D) -> Result<Self::Value, D::Error>
where
D: Deserializer<'de>,
{
deserializer.deserialize_str(self)
}
}
impl<'de, K> Visitor<'de> for KeySeed<K>
where
K: FromStr,
K::Err: Display,
{
type Value = K;
fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
formatter.write_str("a string")
}
fn visit_str<E>(self, string: &str) -> Result<Self::Value, E>
where
E: de::Error,
{
K::from_str(string).map_err(de::Error::custom)
}
}
struct MapVisitor<K, V> {
k: PhantomData<K>,
v: PhantomData<V>,
}
impl<'de, K, V> Visitor<'de> for MapVisitor<K, V>
where
K: Eq + Hash + FromStr,
K::Err: Display,
V: Deserialize<'de>,
{
type Value = HashMap<K, V>;
fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
formatter.write_str("a map")
}
fn visit_map<A>(self, mut input: A) -> Result<Self::Value, A::Error>
where
A: MapAccess<'de>,
{
let mut map = HashMap::new();
while let Some((k, v)) =
input.next_entry_seed(KeySeed { k: PhantomData }, PhantomData)?
{
map.insert(k, v);
}
Ok(map)
}
}
deserializer.deserialize_map(MapVisitor {
k: PhantomData,
v: PhantomData,
})
}