sonic-rs 0.3.11

// The code is cloned from [serde_json](https://github.com/serde-rs/json) and modified necessary parts.

use crate::{
    error::make_error,
    util::{num::ParserNumber, private::Sealed},
};

/// Represents a JSON number, whether integer or floating point.
#[derive(Clone, PartialEq, Eq, Hash)]
pub struct Number {
    pub(crate) n: N,
}

#[derive(Debug, Copy, Clone)]
pub(crate) enum N {
    PosInt(u64),
    /// Always less than zero.
    NegInt(i64),
    /// Always finite.
    Float(f64),
}

use core::{
    fmt::{self, Debug, Display},
    hash::{Hash, Hasher},
};

use serde::{
    de::{self, Visitor},
    forward_to_deserialize_any, Deserialize, Deserializer, Serialize, Serializer,
};

use crate::error::Error;

impl PartialEq for N {
    fn eq(&self, other: &Self) -> bool {
        match (self, other) {
            (N::PosInt(a), N::PosInt(b)) => a == b,
            (N::NegInt(a), N::NegInt(b)) => a == b,
            (N::Float(a), N::Float(b)) => a == b,
            _ => false,
        }
    }
}

// Implementing Eq is fine since any float values are always finite.
impl Eq for N {}

impl Hash for N {
    fn hash<H: Hasher>(&self, h: &mut H) {
        match *self {
            N::PosInt(i) => i.hash(h),
            N::NegInt(i) => i.hash(h),
            N::Float(f) => {
                if f == 0.0f64 {
                    // There are 2 zero representations, +0 and -0, which
                    // compare equal but have different bits. We use the +0 hash
                    // for both so that hash(+0) == hash(-0).
                    0.0f64.to_bits().hash(h);
                } else {
                    f.to_bits().hash(h);
                }
            }
        }
    }
}

/// Number trait for both `Number` and `RawNumber`.
pub trait JsonNumberTrait: Sealed {
    fn is_i64(&self) -> bool;
    fn is_u64(&self) -> bool;
    fn is_f64(&self) -> bool;
    fn as_i64(&self) -> Option<i64>;
    fn as_u64(&self) -> Option<u64>;
    fn as_f64(&self) -> Option<f64>;
}

impl Sealed for Number {}

impl JsonNumberTrait for Number {
    /// Returns true if the `Number` is an integer between `i64::MIN` and
    /// `i64::MAX`.
    ///
    /// For any Number on which `is_i64` returns true, `as_i64` is guaranteed to
    /// return the integer value.
    #[inline]
    fn is_i64(&self) -> bool {
        match self.n {
            N::PosInt(v) => v <= i64::MAX as u64,
            N::NegInt(_) => true,
            N::Float(_) => false,
        }
    }

    /// Returns true if the `Number` is an integer between zero and `u64::MAX`.
    ///
    /// For any Number on which `is_u64` returns true, `as_u64` is guaranteed to
    /// return the integer value.
    #[inline]
    fn is_u64(&self) -> bool {
        match self.n {
            N::PosInt(_) => true,
            N::NegInt(_) | N::Float(_) => false,
        }
    }

    /// Returns true if the `Number` can be represented by f64.
    ///
    /// For any Number on which `is_f64` returns true, `as_f64` is guaranteed to
    /// return the floating point value.
    ///
    /// Currently this function returns true if and only if both `is_i64` and
    /// `is_u64` return false but this is not a guarantee in the future.
    #[inline]
    fn is_f64(&self) -> bool {
        match self.n {
            N::Float(_) => true,
            N::PosInt(_) | N::NegInt(_) => false,
        }
    }

    /// If the `Number` is an integer, represent it as i64 if possible. Returns
    /// None otherwise.
    #[inline]
    fn as_i64(&self) -> Option<i64> {
        match self.n {
            N::PosInt(n) => {
                if n <= i64::MAX as u64 {
                    Some(n as i64)
                } else {
                    None
                }
            }
            N::NegInt(n) => Some(n),
            N::Float(_) => None,
        }
    }

    /// If the `Number` is an integer, represent it as u64 if possible. Returns
    /// None otherwise.
    #[inline]
    fn as_u64(&self) -> Option<u64> {
        match self.n {
            N::PosInt(n) => Some(n),
            N::NegInt(_) | N::Float(_) => None,
        }
    }

    /// Represents the number as finite f64 if possible. Returns None otherwise.
    #[inline]
    fn as_f64(&self) -> Option<f64> {
        match self.n {
            N::PosInt(n) => Some(n as f64),
            N::NegInt(n) => Some(n as f64),
            N::Float(n) => Some(n),
        }
    }
}

impl Number {
    /// Converts a finite `f64` to a `Number`. Infinite or NaN values are not JSON
    /// numbers.
    #[inline]
    pub fn from_f64(f: f64) -> Option<Number> {
        if f.is_finite() {
            let n = { N::Float(f) };
            Some(Number { n })
        } else {
            None
        }
    }
}

impl Display for Number {
    fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
        match self.n {
            N::PosInt(u) => formatter.write_str(itoa::Buffer::new().format(u)),
            N::NegInt(i) => formatter.write_str(itoa::Buffer::new().format(i)),
            N::Float(f) => formatter.write_str(ryu::Buffer::new().format_finite(f)),
        }
    }
}

impl Debug for Number {
    fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
        write!(formatter, "Number({})", self)
    }
}

impl Serialize for Number {
    #[inline]
    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
    where
        S: Serializer,
    {
        match self.n {
            N::PosInt(u) => serializer.serialize_u64(u),
            N::NegInt(i) => serializer.serialize_i64(i),
            N::Float(f) => serializer.serialize_f64(f),
        }
    }
}

impl<'de> Deserialize<'de> for Number {
    #[inline]
    fn deserialize<D>(deserializer: D) -> Result<Number, D::Error>
    where
        D: Deserializer<'de>,
    {
        struct NumberVisitor;

        impl<'de> Visitor<'de> for NumberVisitor {
            type Value = Number;

            fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
                formatter.write_str("a JSON number")
            }

            #[inline]
            fn visit_i64<E>(self, value: i64) -> Result<Number, E> {
                Ok(value.into())
            }

            #[inline]
            fn visit_u64<E>(self, value: u64) -> Result<Number, E> {
                Ok(value.into())
            }

            #[inline]
            fn visit_f64<E>(self, value: f64) -> Result<Number, E>
            where
                E: de::Error,
            {
                Number::from_f64(value).ok_or_else(|| de::Error::custom("not a JSON number"))
            }
        }

        deserializer.deserialize_any(NumberVisitor)
    }
}

macro_rules! deserialize_any {
    (@expand [$($num_string:tt)*]) => {
        #[inline]
        fn deserialize_any<V>(self, visitor: V) -> Result<V::Value, Error>
        where
            V: Visitor<'de>,
        {
            match self.n {
                N::PosInt(u) => visitor.visit_u64(u),
                N::NegInt(i) => visitor.visit_i64(i),
                N::Float(f) => visitor.visit_f64(f),
            }
        }
    };

    (owned) => {
        deserialize_any!(@expand [n]);
    };

    (ref) => {
        deserialize_any!(@expand [n.clone()]);
    };
}

macro_rules! deserialize_number {
    ($deserialize:ident) => {
        fn $deserialize<V>(self, visitor: V) -> Result<V::Value, Error>
        where
            V: Visitor<'de>,
        {
            self.deserialize_any(visitor)
        }
    };
}

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

    deserialize_any!(owned);

    deserialize_number!(deserialize_i8);
    deserialize_number!(deserialize_i16);
    deserialize_number!(deserialize_i32);
    deserialize_number!(deserialize_i64);
    deserialize_number!(deserialize_i128);
    deserialize_number!(deserialize_u8);
    deserialize_number!(deserialize_u16);
    deserialize_number!(deserialize_u32);
    deserialize_number!(deserialize_u64);
    deserialize_number!(deserialize_u128);
    deserialize_number!(deserialize_f32);
    deserialize_number!(deserialize_f64);

    forward_to_deserialize_any! {
        bool char str string bytes byte_buf option unit unit_struct
        newtype_struct seq tuple tuple_struct map struct enum identifier
        ignored_any
    }
}

impl<'de, 'a> Deserializer<'de> for &'a Number {
    type Error = Error;

    deserialize_any!(ref);

    deserialize_number!(deserialize_i8);
    deserialize_number!(deserialize_i16);
    deserialize_number!(deserialize_i32);
    deserialize_number!(deserialize_i64);
    deserialize_number!(deserialize_i128);
    deserialize_number!(deserialize_u8);
    deserialize_number!(deserialize_u16);
    deserialize_number!(deserialize_u32);
    deserialize_number!(deserialize_u64);
    deserialize_number!(deserialize_u128);
    deserialize_number!(deserialize_f32);
    deserialize_number!(deserialize_f64);

    forward_to_deserialize_any! {
        bool char str string bytes byte_buf option unit unit_struct
        newtype_struct seq tuple tuple_struct map struct enum identifier
        ignored_any
    }
}

impl From<ParserNumber> for Number {
    fn from(value: ParserNumber) -> Self {
        let n = match value {
            ParserNumber::Float(f) => N::Float(f),
            ParserNumber::Unsigned(u) => N::PosInt(u),
            ParserNumber::Signed(i) => N::NegInt(i),
        };
        Number { n }
    }
}

macro_rules! impl_from_unsigned {
    (
        $($ty:ty),*
    ) => {
        $(
            impl From<$ty> for Number {
                #[inline]
                fn from(u: $ty) -> Self {
                    let n = {
                        { N::PosInt(u as u64) }
                    };
                    Number { n }
                }
            }
        )*
    };
}

macro_rules! impl_from_signed {
    (
        $($ty:ty),*
    ) => {
        $(
            impl From<$ty> for Number {
                #[inline]
                fn from(i: $ty) -> Self {
                    let n = {
                            if i < 0 {
                                N::NegInt(i as i64)
                            } else {
                                N::PosInt(i as u64)
                            }
                    };
                    Number { n }
                }
            }
        )*
    };
}

impl_from_unsigned!(u8, u16, u32, u64, usize);
impl_from_signed!(i8, i16, i32, i64, isize);

impl TryFrom<f32> for Number {
    type Error = crate::Error;
    #[inline]
    fn try_from(f: f32) -> Result<Self, Self::Error> {
        Number::try_from(f as f64)
    }
}

impl TryFrom<f64> for Number {
    type Error = crate::Error;
    fn try_from(value: f64) -> Result<Self, Self::Error> {
        Number::from_f64(value)
            .ok_or_else(|| make_error("NaN or Infinity is not a valid JSON value".to_string()))
    }
}