ossify 0.4.0

use std::{io, str};

use serde::ser;

use crate::ser::Error;

pub struct KeySerializer<'a, W: io::Write> {
    pub(crate) writer: &'a mut W,
}

impl<W> KeySerializer<'_, W>
where
    W: io::Write,
{
    fn serialize_integer<I>(&mut self, value: I) -> Result<(), Error>
    where
        I: itoa::Integer,
    {
        let mut buf = itoa::Buffer::new();
        let part = buf.format(value);
        ser::Serializer::serialize_str(self, part)
    }

    fn serialize_floating<F>(&mut self, value: F) -> Result<(), Error>
    where
        F: ryu::Float,
    {
        let mut buf = ryu::Buffer::new();
        let part = buf.format(value);
        ser::Serializer::serialize_str(self, part)
    }
}

impl<W> ser::Serializer for &mut KeySerializer<'_, W>
where
    W: io::Write,
{
    type Ok = ();
    type Error = Error;

    type SerializeSeq = ser::Impossible<Self::Ok, Self::Error>;
    type SerializeTuple = ser::Impossible<Self::Ok, Self::Error>;
    type SerializeTupleStruct = ser::Impossible<Self::Ok, Self::Error>;
    type SerializeTupleVariant = ser::Impossible<Self::Ok, Self::Error>;
    type SerializeMap = ser::Impossible<Self::Ok, Self::Error>;
    type SerializeStruct = ser::Impossible<Self::Ok, Self::Error>;
    type SerializeStructVariant = ser::Impossible<Self::Ok, Self::Error>;

    fn serialize_bool(self, v: bool) -> Result<Self::Ok, Self::Error> {
        self.serialize_str(if v { "true" } else { "false" })
    }

    fn serialize_i8(self, v: i8) -> Result<Self::Ok, Self::Error> {
        self.serialize_integer(v)
    }

    fn serialize_i16(self, v: i16) -> Result<Self::Ok, Self::Error> {
        self.serialize_integer(v)
    }

    fn serialize_i32(self, v: i32) -> Result<Self::Ok, Self::Error> {
        self.serialize_integer(v)
    }

    fn serialize_i64(self, v: i64) -> Result<Self::Ok, Self::Error> {
        self.serialize_integer(v)
    }

    fn serialize_u8(self, v: u8) -> Result<Self::Ok, Self::Error> {
        self.serialize_integer(v)
    }

    fn serialize_u16(self, v: u16) -> Result<Self::Ok, Self::Error> {
        self.serialize_integer(v)
    }

    fn serialize_u32(self, v: u32) -> Result<Self::Ok, Self::Error> {
        self.serialize_integer(v)
    }

    fn serialize_u64(self, v: u64) -> Result<Self::Ok, Self::Error> {
        self.serialize_integer(v)
    }

    fn serialize_u128(self, v: u128) -> Result<Self::Ok, Self::Error> {
        self.serialize_integer(v)
    }

    fn serialize_i128(self, v: i128) -> Result<Self::Ok, Self::Error> {
        self.serialize_integer(v)
    }

    fn serialize_f32(self, v: f32) -> Result<Self::Ok, Self::Error> {
        self.serialize_floating(v)
    }

    fn serialize_f64(self, v: f64) -> Result<Self::Ok, Self::Error> {
        self.serialize_floating(v)
    }

    fn serialize_char(self, v: char) -> Result<Self::Ok, Self::Error> {
        self.writer.write_all(v.to_string().as_bytes())?;
        Ok(())
    }

    fn serialize_str(self, value: &str) -> Result<Self::Ok, Self::Error> {
        self.writer.write_all(value.as_bytes())?;
        Ok(())
    }

    fn serialize_bytes(self, value: &[u8]) -> Result<Self::Ok, Self::Error> {
        match str::from_utf8(value) {
            Ok(value) => self.serialize_str(value),
            Err(err) => Err(Error::Utf8(err)),
        }
    }

    fn serialize_unit(self) -> Result<Self::Ok, Self::Error> {
        Err(Error::UnsupportedType("unit"))
    }

    fn serialize_unit_struct(self, name: &'static str) -> Result<Self::Ok, Self::Error> {
        self.serialize_str(name)
    }

    fn serialize_unit_variant(
        self,
        _name: &'static str,
        _variant_index: u32,
        variant: &'static str,
    ) -> Result<Self::Ok, Self::Error> {
        self.serialize_str(variant)
    }

    fn serialize_newtype_struct<T: ?Sized + ser::Serialize>(
        self,
        _name: &'static str,
        value: &T,
    ) -> Result<Self::Ok, Self::Error> {
        value.serialize(self)
    }

    fn serialize_newtype_variant<T: ?Sized + ser::Serialize>(
        self,
        _name: &'static str,
        _variant_index: u32,
        _variant: &'static str,
        _value: &T,
    ) -> Result<Self::Ok, Self::Error> {
        Err(Error::UnsupportedType("newtype variant"))
    }

    fn serialize_none(self) -> Result<Self::Ok, Self::Error> {
        Err(Error::UnsupportedType("none"))
    }

    fn serialize_some<T: ?Sized + ser::Serialize>(self, _value: &T) -> Result<Self::Ok, Self::Error> {
        Err(Error::UnsupportedType("some"))
    }

    fn serialize_seq(self, _len: Option<usize>) -> Result<Self::SerializeSeq, Self::Error> {
        Err(Error::UnsupportedType("sequence"))
    }

    fn serialize_tuple(self, _len: usize) -> Result<Self::SerializeTuple, Self::Error> {
        Err(Error::UnsupportedType("tuple"))
    }

    fn serialize_tuple_struct(
        self,
        _name: &'static str,
        _len: usize,
    ) -> Result<Self::SerializeTuple, Self::Error> {
        Err(Error::UnsupportedType("tuple struct"))
    }

    fn serialize_tuple_variant(
        self,
        _name: &'static str,
        _variant_index: u32,
        _variant: &'static str,
        _len: usize,
    ) -> Result<Self::SerializeTupleVariant, Self::Error> {
        Err(Error::UnsupportedType("tuple variant"))
    }

    fn serialize_map(self, _len: Option<usize>) -> Result<Self::SerializeMap, Self::Error> {
        Err(Error::UnsupportedType("map"))
    }

    fn serialize_struct(
        self,
        _name: &'static str,
        _len: usize,
    ) -> Result<Self::SerializeStruct, Self::Error> {
        Err(Error::UnsupportedType("struct"))
    }

    fn serialize_struct_variant(
        self,
        _name: &'static str,
        _variant_index: u32,
        _variant: &'static str,
        _len: usize,
    ) -> Result<Self::SerializeStructVariant, Self::Error> {
        Err(Error::UnsupportedType("struct variant"))
    }
}