enumoid 0.2.3

Enum Indexed Containers
Documentation 
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use crate::base::EnumArrayHelper;
use crate::base::Enumoid;
use crate::flags::EnumFlags;
use crate::map::EnumMap;
use crate::opt_map::EnumOptionMap;
use crate::vec::EnumVec;
use num_traits::AsPrimitive;
use serde::{de, ser};
use std::convert::TryFrom;
use std::fmt;
use std::marker;

struct OptMapSerdeVisitor<T: EnumArrayHelper<V>, V, R> {
  marker: marker::PhantomData<fn(EnumOptionMap<T, V>) -> R>,
}

impl<T: EnumArrayHelper<V>, V, R> OptMapSerdeVisitor<T, V, R> {
  fn new() -> Self {
    OptMapSerdeVisitor {
      marker: marker::PhantomData,
    }
  }
}

impl<'de, K, V, R> de::Visitor<'de> for OptMapSerdeVisitor<K, V, R>
where
  K: EnumArrayHelper<V> + de::Deserialize<'de>,
  V: de::Deserialize<'de>,
  R: TryFrom<EnumOptionMap<K, V>>,
{
  type Value = R;

  fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
    formatter.write_str("Enumoid indexed container")
  }

  fn visit_map<M>(self, mut access: M) -> Result<Self::Value, M::Error>
  where
    M: de::MapAccess<'de>,
  {
    let mut map = EnumOptionMap::new();
    while let Some((key, value)) = access.next_entry::<K, V>()? {
      map.set(key, Some(value));
    }
    match R::try_from(map) {
      Ok(r) => Ok(r),
      Err(_) => Err(de::Error::custom("malformed")),
    }
  }
}

impl<T: EnumArrayHelper<V> + serde::ser::Serialize, V: serde::ser::Serialize>
  serde::ser::Serialize for EnumMap<T, V>
{
  fn serialize<S>(&self, ser: S) -> Result<S::Ok, S::Error>
  where
    S: serde::ser::Serializer,
  {
    use serde::ser::SerializeMap;
    let mut map = ser.serialize_map(Some(T::SIZE))?;
    for (k, v) in self.iter() {
      map.serialize_entry(&k, v)?;
    }
    map.end()
  }
}

impl<
    'de,
    T: EnumArrayHelper<V> + de::Deserialize<'de>,
    V: de::Deserialize<'de>,
  > de::Deserialize<'de> for EnumMap<T, V>
{
  fn deserialize<D>(de: D) -> Result<Self, D::Error>
  where
    D: de::Deserializer<'de>,
  {
    de.deserialize_map(OptMapSerdeVisitor::<T, V, EnumMap<T, V>>::new())
  }
}

impl<T: EnumArrayHelper<V> + ser::Serialize, V: ser::Serialize> ser::Serialize
  for EnumVec<T, V>
{
  fn serialize<S>(&self, ser: S) -> Result<S::Ok, S::Error>
  where
    S: ser::Serializer,
  {
    use ser::SerializeMap;
    let mut map = ser.serialize_map(Some(self.len.as_()))?;
    for (k, v) in self.iter() {
      map.serialize_entry(&k, v)?;
    }
    map.end()
  }
}

impl<
    'de,
    T: EnumArrayHelper<V> + de::Deserialize<'de>,
    V: de::Deserialize<'de>,
  > de::Deserialize<'de> for EnumVec<T, V>
{
  fn deserialize<D>(de: D) -> Result<Self, D::Error>
  where
    D: de::Deserializer<'de>,
  {
    de.deserialize_map(OptMapSerdeVisitor::<T, V, EnumVec<T, V>>::new())
  }
}

struct FlagsSerdeVisitor<T: Enumoid, R> {
  marker: marker::PhantomData<fn(EnumFlags<T>) -> R>,
}

impl<T: Enumoid, R> FlagsSerdeVisitor<T, R> {
  fn new() -> Self {
    FlagsSerdeVisitor {
      marker: marker::PhantomData,
    }
  }
}

impl<'de, K, R> de::Visitor<'de> for FlagsSerdeVisitor<K, R>
where
  K: Enumoid + de::Deserialize<'de>,
  R: TryFrom<EnumFlags<K>>,
{
  type Value = R;

  fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
    formatter.write_str("Enumoid indexed container")
  }

  fn visit_map<M>(self, mut access: M) -> Result<Self::Value, M::Error>
  where
    M: de::MapAccess<'de>,
  {
    let mut map = EnumFlags::new();
    while let Some((key, value)) = access.next_entry::<K, bool>()? {
      map.set(key, value);
    }
    match R::try_from(map) {
      Ok(r) => Ok(r),
      Err(_) => Err(de::Error::custom("malformed")),
    }
  }
}

impl<T: Enumoid + ser::Serialize> ser::Serialize for EnumFlags<T> {
  fn serialize<S>(&self, ser: S) -> Result<S::Ok, S::Error>
  where
    S: ser::Serializer,
  {
    use ser::SerializeMap;
    let mut map = ser.serialize_map(Some(T::SIZE))?;
    for (k, v) in self.iter() {
      map.serialize_entry(&k, &v)?;
    }
    map.end()
  }
}

impl<'de, T: Enumoid + de::Deserialize<'de>> de::Deserialize<'de>
  for EnumFlags<T>
{
  fn deserialize<D>(de: D) -> Result<Self, D::Error>
  where
    D: de::Deserializer<'de>,
  {
    de.deserialize_map(FlagsSerdeVisitor::<T, EnumFlags<T>>::new())
  }
}