serde_encom 0.4.0

Official EnCom library
Documentation 
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use crate::error::{Error, Result};
use serde::de::{self, Expected, Unexpected};

pub(crate) enum ParserNumber {
    F64(f64),
    U64(u64),
    I64(i64),
    #[cfg(feature = "arbitrary_precision")]
    String(String),
}

impl ParserNumber {
    pub(crate) fn visit<'de, V>(self, visitor: V) -> Result<V::Value>
    where
        V: de::Visitor<'de>,
    {
        match self {
            ParserNumber::F64(x) => visitor.visit_f64(x),
            ParserNumber::U64(x) => visitor.visit_u64(x),
            ParserNumber::I64(x) => visitor.visit_i64(x),
            #[cfg(feature = "arbitrary_precision")]
            ParserNumber::String(x) => visitor.visit_map(NumberDeserializer { number: x.into() }),
        }
    }

    pub(crate) fn invalid_type(self, exp: &dyn Expected) -> Error {
        match self {
            ParserNumber::F64(x) => de::Error::invalid_type(Unexpected::Float(x), exp),
            ParserNumber::U64(x) => de::Error::invalid_type(Unexpected::Unsigned(x), exp),
            ParserNumber::I64(x) => de::Error::invalid_type(Unexpected::Signed(x), exp),
            #[cfg(feature = "arbitrary_precision")]
            ParserNumber::String(_) => de::Error::invalid_type(Unexpected::Other("number"), exp),
        }
    }
}