musli 0.0.149

Müsli is a flexible and efficient serialization framework.
Documentation 
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use core::fmt;
use core::marker::PhantomData;

use crate::en::{Encode, Encoder};
use crate::{Context, Writer};

pub(crate) struct JsonObjectKeyEncoder<W, C, M> {
    cx: C,
    writer: W,
    _marker: PhantomData<M>,
}

impl<W, C, M> JsonObjectKeyEncoder<W, C, M> {
    #[inline]
    pub(super) fn new(cx: C, writer: W) -> Self {
        Self {
            cx,
            writer,
            _marker: PhantomData,
        }
    }
}

macro_rules! format_integer {
    ($slf:ident, $value:ident) => {{
        $slf.writer.write_byte($slf.cx, b'"')?;
        let mut buffer = itoa::Buffer::new();
        $slf.writer
            .write_bytes($slf.cx, buffer.format($value).as_bytes())?;
        $slf.writer.write_byte($slf.cx, b'"')?;
        Ok(())
    }};
}

#[crate::trait_defaults(crate)]
impl<W, C, M> Encoder for JsonObjectKeyEncoder<W, C, M>
where
    W: Writer,
    C: Context,
    M: 'static,
{
    type Cx = C;
    type Error = C::Error;
    type Mode = M;

    #[inline]
    fn cx(&self) -> Self::Cx {
        self.cx
    }

    #[inline]
    fn expecting(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        write!(f, "any type that can be used as an object key")
    }

    #[inline]
    fn encode<T>(self, value: T) -> Result<(), Self::Error>
    where
        T: Encode<Self::Mode>,
    {
        value.as_encode().encode(self)
    }

    #[inline]
    fn encode_u8(mut self, value: u8) -> Result<(), Self::Error> {
        format_integer!(self, value)
    }

    #[inline]
    fn encode_u16(mut self, value: u16) -> Result<(), Self::Error> {
        format_integer!(self, value)
    }

    #[inline]
    fn encode_u32(mut self, value: u32) -> Result<(), Self::Error> {
        format_integer!(self, value)
    }

    #[inline]
    fn encode_u64(mut self, value: u64) -> Result<(), Self::Error> {
        format_integer!(self, value)
    }

    #[inline]
    fn encode_u128(mut self, value: u128) -> Result<(), Self::Error> {
        format_integer!(self, value)
    }

    #[inline]
    fn encode_i8(mut self, value: i8) -> Result<(), Self::Error> {
        format_integer!(self, value)
    }

    #[inline]
    fn encode_i16(mut self, value: i16) -> Result<(), Self::Error> {
        format_integer!(self, value)
    }

    #[inline]
    fn encode_i32(mut self, value: i32) -> Result<(), Self::Error> {
        format_integer!(self, value)
    }

    #[inline]
    fn encode_i64(mut self, value: i64) -> Result<(), Self::Error> {
        format_integer!(self, value)
    }

    #[inline]
    fn encode_i128(mut self, value: i128) -> Result<(), Self::Error> {
        format_integer!(self, value)
    }

    #[inline]
    fn encode_usize(mut self, value: usize) -> Result<(), Self::Error> {
        format_integer!(self, value)
    }

    #[inline]
    fn encode_isize(mut self, value: isize) -> Result<(), Self::Error> {
        format_integer!(self, value)
    }

    #[inline]
    fn encode_string(self, string: &str) -> Result<(), Self::Error> {
        super::encode_string(self.cx, self.writer, string.as_bytes())
    }
}