serde_magnus 0.10.0

Serde integration for Magnus
Documentation 
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use super::{ArrayDeserializer, Deserializer, HashDeserializer};
use crate::error::Error;
use magnus::{value::ReprValue, RArray, RHash, Ruby, Value};
use serde::de::{DeserializeSeed, Unexpected, VariantAccess};

pub struct VariantDeserializer<'r> {
    ruby: &'r Ruby,
    value: Value,
}

impl<'r> VariantDeserializer<'r> {
    pub fn new(ruby: &'r Ruby, value: Value) -> VariantDeserializer<'r> {
        VariantDeserializer { ruby, value }
    }
}

impl<'r, 'i> VariantAccess<'i> for VariantDeserializer<'r> {
    type Error = Error;

    fn unit_variant(self) -> Result<(), Self::Error> {
        if self.value.is_nil() {
            Ok(())
        } else {
            Err(serde::de::Error::invalid_type(
                #[allow(clippy::unnecessary_to_owned)]
                Unexpected::Other(&unsafe { self.value.classname() }.into_owned()),
                &"unit variant",
            ))
        }
    }

    fn newtype_variant_seed<Seed>(self, seed: Seed) -> Result<Seed::Value, Self::Error>
    where
        Seed: DeserializeSeed<'i>,
    {
        seed.deserialize(Deserializer::new(self.ruby, self.value))
    }

    fn tuple_variant<Visitor>(
        self,
        _len: usize,
        visitor: Visitor,
    ) -> Result<Visitor::Value, Self::Error>
    where
        Visitor: serde::de::Visitor<'i>,
    {
        if let Some(array) = RArray::from_value(self.value) {
            visitor.visit_seq(&mut ArrayDeserializer::new(self.ruby, array))
        } else {
            Err(serde::de::Error::invalid_type(
                #[allow(clippy::unnecessary_to_owned)]
                Unexpected::Other(&unsafe { self.value.classname() }.into_owned()),
                &"tuple variant",
            ))
        }
    }

    fn struct_variant<Visitor>(
        self,
        _fields: &'static [&'static str],
        visitor: Visitor,
    ) -> Result<Visitor::Value, Self::Error>
    where
        Visitor: serde::de::Visitor<'i>,
    {
        if let Some(hash) = RHash::from_value(self.value) {
            visitor.visit_map(&mut HashDeserializer::new(self.ruby, hash)?)
        } else {
            Err(serde::de::Error::invalid_type(
                #[allow(clippy::unnecessary_to_owned)]
                Unexpected::Other(&unsafe { self.value.classname() }.into_owned()),
                &"struct variant",
            ))
        }
    }
}