eon 0.2.0

Use the Eon config format with serde
Documentation 
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use std::fmt;

use serde::de::{Deserialize, Deserializer, MapAccess, SeqAccess, Visitor};

use crate::{Map, Number, Value};

impl<'de> Deserialize<'de> for Value {
    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
    where
        D: Deserializer<'de>,
    {
        struct ValueVisitor;

        impl<'de> Visitor<'de> for ValueVisitor {
            type Value = Value;

            #[inline]
            fn expecting(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
                formatter.write_str("any valid value")
            }

            #[inline]
            fn visit_bool<E>(self, v: bool) -> Result<Self::Value, E> {
                Ok(Value::Bool(v))
            }

            #[inline]
            fn visit_i64<E>(self, v: i64) -> Result<Self::Value, E> {
                Ok(Value::Number(Number::from(v)))
            }

            #[inline]
            fn visit_u64<E>(self, v: u64) -> Result<Self::Value, E> {
                Ok(Value::Number(Number::from(v)))
            }

            #[inline]
            fn visit_f64<E>(self, v: f64) -> Result<Self::Value, E> {
                Ok(Value::Number(Number::from(v)))
            }

            #[inline]
            fn visit_str<E>(self, v: &str) -> Result<Self::Value, E> {
                Ok(Value::String(v.to_owned()))
            }

            #[inline]
            fn visit_string<E>(self, v: String) -> Result<Self::Value, E> {
                Ok(Value::String(v))
            }

            #[inline]
            fn visit_none<E>(self) -> Result<Value, E> {
                Ok(Value::Null)
            }

            #[inline]
            fn visit_some<D>(self, deserializer: D) -> Result<Value, D::Error>
            where
                D: serde::Deserializer<'de>,
            {
                Deserialize::deserialize(deserializer)
            }

            #[inline]
            fn visit_unit<E>(self) -> Result<Value, E> {
                Ok(Value::Null)
            }

            #[inline]
            fn visit_seq<V>(self, mut access: V) -> Result<Value, V::Error>
            where
                V: SeqAccess<'de>,
            {
                let mut list = Vec::new();

                while let Some(elem) = access.next_element()? {
                    list.push(elem);
                }

                Ok(Value::List(list))
            }

            fn visit_map<V>(self, mut access: V) -> Result<Value, V::Error>
            where
                V: MapAccess<'de>,
            {
                let mut map = Map::with_capacity(access.size_hint().unwrap_or(0));

                while let Some((key, value)) = access.next_entry()? {
                    map.insert(key, value);
                }

                Ok(Value::Map(map))
            }
        }

        deserializer.deserialize_any(ValueVisitor)
    }
}