simd-json 0.13.0

use crate::cow::Cow;
use crate::Error;
use serde::de::{Unexpected, Visitor};
use serde::forward_to_deserialize_any;
use serde_ext::de::{self, IntoDeserializer};

macro_rules! deserialize_integer_key {
    ($method:ident => $visit:ident) => {
        fn $method<V>(self, visitor: V) -> Result<V::Value, Self::Error>
        where
            V: Visitor<'de>,
        {
            match (self.key.parse(), self.key) {
                (Ok(integer), _) => visitor.$visit(integer),
                #[cfg(feature = "beef")]
                (Err(_), s) => {
                    if s.is_borrowed() {
                        visitor.visit_borrowed_str(s.unwrap_borrowed())
                    } else {
                        visitor.visit_string(s.into_owned())
                    }
                }
                #[cfg(not(feature = "beef"))]
                (Err(_), Cow::Borrowed(s)) => visitor.visit_borrowed_str(s),
                #[cfg(not(feature = "beef"))]
                (Err(_), Cow::Owned(s)) => visitor.visit_string(s),
            }
        }
    };
}

// from: https://raw.githubusercontent.com/serde-rs/json/9295c96c8e2f3056beb23ba02a8d47f1704e5b02/src/value/de.rs
pub(crate) struct MapKeyDeserializer<'de> {
    pub(crate) key: Cow<'de, str>,
}

impl<'de> MapKeyDeserializer<'de> {
    pub(crate) fn borrowed(key: &'de str) -> Self {
        Self {
            key: Cow::from(key),
        }
    }
}

impl<'de> serde::Deserializer<'de> for MapKeyDeserializer<'de> {
    type Error = Error;

    fn deserialize_any<V>(self, visitor: V) -> Result<V::Value, Self::Error>
    where
        V: Visitor<'de>,
    {
        BorrowedCowStrDeserializer::new(self.key).deserialize_any(visitor)
    }

    deserialize_integer_key!(deserialize_i8 => visit_i8);
    deserialize_integer_key!(deserialize_i16 => visit_i16);
    deserialize_integer_key!(deserialize_i32 => visit_i32);
    deserialize_integer_key!(deserialize_i64 => visit_i64);
    #[cfg(feature = "128bit")]
    deserialize_integer_key!(deserialize_i128 => visit_i128);
    deserialize_integer_key!(deserialize_u8 => visit_u8);
    deserialize_integer_key!(deserialize_u16 => visit_u16);
    deserialize_integer_key!(deserialize_u32 => visit_u32);
    deserialize_integer_key!(deserialize_u64 => visit_u64);
    #[cfg(feature = "128bit")]
    deserialize_integer_key!(deserialize_u128 => visit_u128);

    #[inline]
    fn deserialize_option<V>(self, visitor: V) -> Result<V::Value, Self::Error>
    where
        V: Visitor<'de>,
    {
        // Map keys cannot be null.
        visitor.visit_some(self)
    }

    #[inline]
    fn deserialize_newtype_struct<V>(
        self,
        _name: &'static str,
        visitor: V,
    ) -> Result<V::Value, Self::Error>
    where
        V: Visitor<'de>,
    {
        visitor.visit_newtype_struct(self)
    }

    fn deserialize_enum<V>(
        self,
        name: &'static str,
        variants: &'static [&'static str],
        visitor: V,
    ) -> Result<V::Value, Self::Error>
    where
        V: Visitor<'de>,
    {
        self.key
            .into_deserializer()
            .deserialize_enum(name, variants, visitor)
    }

    forward_to_deserialize_any! {
        bool f32 f64 char str string bytes byte_buf unit unit_struct seq tuple
        tuple_struct map struct identifier ignored_any
    }
}

struct BorrowedCowStrDeserializer<'de> {
    value: Cow<'de, str>,
}

impl<'de> BorrowedCowStrDeserializer<'de> {
    fn new(value: Cow<'de, str>) -> Self {
        BorrowedCowStrDeserializer { value }
    }
}

impl<'de> de::Deserializer<'de> for BorrowedCowStrDeserializer<'de> {
    type Error = Error;

    #[cfg(feature = "beef")]
    fn deserialize_any<V>(self, visitor: V) -> Result<V::Value, Self::Error>
    where
        V: de::Visitor<'de>,
    {
        if self.value.is_borrowed() {
            visitor.visit_borrowed_str(self.value.unwrap_borrowed())
        } else {
            visitor.visit_string(self.value.into_owned())
        }
    }
    #[cfg(not(feature = "beef"))]
    fn deserialize_any<V>(self, visitor: V) -> Result<V::Value, Self::Error>
    where
        V: de::Visitor<'de>,
    {
        match self.value {
            Cow::Borrowed(string) => visitor.visit_borrowed_str(string),
            Cow::Owned(string) => visitor.visit_string(string),
        }
    }

    fn deserialize_enum<V>(
        self,
        _name: &str,
        _variants: &'static [&'static str],
        visitor: V,
    ) -> Result<V::Value, Self::Error>
    where
        V: de::Visitor<'de>,
    {
        visitor.visit_enum(self)
    }

    forward_to_deserialize_any! {
        bool i8 i16 i32 i64 i128 u8 u16 u32 u64 u128 f32 f64 char str string
        bytes byte_buf option unit unit_struct newtype_struct seq tuple
        tuple_struct map struct identifier ignored_any
    }
}
struct UnitOnly;

impl<'de> de::VariantAccess<'de> for UnitOnly {
    type Error = Error;

    fn unit_variant(self) -> Result<(), Self::Error> {
        Ok(())
    }

    fn newtype_variant_seed<T>(self, _seed: T) -> Result<T::Value, Self::Error>
    where
        T: de::DeserializeSeed<'de>,
    {
        Err(de::Error::invalid_type(
            Unexpected::UnitVariant,
            &"newtype variant",
        ))
    }

    fn tuple_variant<V>(self, _len: usize, _visitor: V) -> Result<V::Value, Self::Error>
    where
        V: de::Visitor<'de>,
    {
        Err(de::Error::invalid_type(
            Unexpected::UnitVariant,
            &"tuple variant",
        ))
    }

    fn struct_variant<V>(
        self,
        _fields: &'static [&'static str],
        _visitor: V,
    ) -> Result<V::Value, Self::Error>
    where
        V: de::Visitor<'de>,
    {
        Err(de::Error::invalid_type(
            Unexpected::UnitVariant,
            &"struct variant",
        ))
    }
}

impl<'de> de::EnumAccess<'de> for BorrowedCowStrDeserializer<'de> {
    type Error = Error;
    type Variant = UnitOnly;

    fn variant_seed<T>(self, seed: T) -> Result<(T::Value, Self::Variant), Self::Error>
    where
        T: de::DeserializeSeed<'de>,
    {
        let value = seed.deserialize(self)?;
        Ok((value, UnitOnly))
    }
}