toml_edit 0.3.1

Yet another format-preserving TOML parser.
Documentation 
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use serde::de::IntoDeserializer;

use crate::easy::de::Error;

pub(crate) struct ValueDeserializer {
    input: crate::Value,
}

impl ValueDeserializer {
    pub(crate) fn new(input: crate::Value) -> Self {
        Self { input }
    }
}

impl<'de, 'a> serde::Deserializer<'de> for ValueDeserializer {
    type Error = Error;

    fn deserialize_any<V>(self, visitor: V) -> Result<V::Value, Self::Error>
    where
        V: serde::de::Visitor<'de>,
    {
        match self.input {
            crate::Value::String(v) => visitor.visit_string(v.into_value()),
            crate::Value::Integer(v) => visitor.visit_i64(v.into_value()),
            crate::Value::Float(v) => visitor.visit_f64(v.into_value()),
            crate::Value::Boolean(v) => visitor.visit_bool(v.into_value()),
            crate::Value::Datetime(v) => visitor.visit_string(v.into_value().to_string()),
            crate::Value::Array(v) => {
                visitor.visit_seq(crate::easy::de::ArraySeqAccess::with_array(v))
            }
            crate::Value::InlineTable(v) => {
                visitor.visit_map(crate::easy::de::InlineTableMapAccess::new(v))
            }
        }
    }

    // `None` is interpreted as a missing field so be sure to implement `Some`
    // as a present field.
    fn deserialize_option<V>(self, visitor: V) -> Result<V::Value, Error>
    where
        V: serde::de::Visitor<'de>,
    {
        visitor.visit_some(self)
    }

    // Called when the type to deserialize is an enum, as opposed to a field in the type.
    fn deserialize_enum<V>(
        self,
        _name: &'static str,
        _variants: &'static [&'static str],
        visitor: V,
    ) -> Result<V::Value, Error>
    where
        V: serde::de::Visitor<'de>,
    {
        match self.input {
            crate::Value::String(v) => visitor.visit_enum(v.into_value().into_deserializer()),
            crate::Value::InlineTable(v) => {
                if v.is_empty() {
                    Err(crate::easy::de::Error::custom(
                        "wanted exactly 1 element, found 0 elements",
                    ))
                } else if v.len() != 1 {
                    Err(crate::easy::de::Error::custom(
                        "wanted exactly 1 element, more than 1 element",
                    ))
                } else {
                    visitor.visit_enum(crate::easy::de::InlineTableMapAccess::new(v))
                }
            }
            _ => Err(crate::easy::de::Error::custom(
                "wanted string or inline table",
            )),
        }
    }

    serde::forward_to_deserialize_any! {
        bool u8 u16 u32 u64 i8 i16 i32 i64 f32 f64 char str string seq
        bytes byte_buf map unit newtype_struct
        ignored_any unit_struct tuple_struct tuple identifier struct
    }
}