cel-cxx 0.2.5

A high-performance, type-safe Rust interface for Common Expression Language (CEL), build on top of cel-cpp with zero-cost FFI bindings via cxx
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use super::{impl_into, impl_typed};
use crate::{types::*, values::*};

impl_typed!(
    Optional: Value {
        @[T: TypedValue]
        Optional<T> => OptionalType::new(T::value_type()),

        @[T: TypedValue]
        Option<T> => OptionalType::new(T::value_type()),
    }
);

impl_into!(
    Optional: Value {
        @[T: IntoValue]
        Optional<T> => |self| self.map(IntoValue::into_value),

        @[T: IntoValue]
        Option<T> => |self| self.map(IntoValue::into_value).into(),
    }
);

// FromValue for Optional<T>
impl<T: FromValue + TypedValue> FromValue for Optional<T> {
    type Output<'a> = Optional<T::Output<'a>>;

    fn from_value<'a>(value: &'a Value) -> Result<Self::Output<'a>, FromValueError> {
        match value {
            Value::Optional(o) => o.as_ref().map(|v| T::from_value(v)).transpose(),
            _ => Err(FromValueError::new_typed::<Self>(value.clone())),
        }
    }
}

// TryFrom<&Value> for Optional<T>
impl<'a, T: TryFrom<&'a Value, Error = FromValueError> + TypedValue> TryFrom<&'a Value>
    for Optional<T>
{
    type Error = FromValueError;

    fn try_from(value: &'a Value) -> Result<Self, Self::Error> {
        match value {
            Value::Optional(o) => o.as_ref().map(|v| T::try_from(v)).transpose(),
            _ => Err(FromValueError::new_typed::<Self>(value.clone())),
        }
    }
}

// TryFrom<Value> for Optional<T>
impl<T: TryFrom<Value, Error = FromValueError> + TypedValue> TryFrom<Value> for Optional<T> {
    type Error = FromValueError;

    fn try_from(value: Value) -> Result<Self, Self::Error> {
        match value {
            Value::Optional(o) => o.map(|v| T::try_from(v)).transpose(),
            _ => Err(FromValueError::new_typed::<Self>(value)),
        }
    }
}

// FromValue for Option<T>
impl<T: FromValue + TypedValue> FromValue for Option<T> {
    type Output<'a> = Option<T::Output<'a>>;

    fn from_value<'a>(value: &'a Value) -> Result<Self::Output<'a>, FromValueError> {
        match value {
            Value::Optional(o) => o
                .as_ref()
                .map(|v| T::from_value(v))
                .transpose()
                .map(|optional| optional.into()),
            _ => Err(FromValueError::new_typed::<Self>(value.clone())),
        }
    }
}

// TryFrom<&Value> for Option<T>
impl<'a, T: TryFrom<&'a Value, Error = FromValueError> + TypedValue> TryFrom<&'a Value>
    for Option<T>
{
    type Error = FromValueError;

    fn try_from(value: &'a Value) -> Result<Self, Self::Error> {
        match value {
            Value::Optional(o) => o
                .as_ref()
                .map(|v| T::try_from(v))
                .transpose()
                .map(|optional| optional.into()),
            _ => Err(FromValueError::new_typed::<Self>(value.clone())),
        }
    }
}

// TryFrom<Value> for Option<T>
impl<T: TryFrom<Value, Error = FromValueError> + TypedValue> TryFrom<Value> for Option<T> {
    type Error = FromValueError;

    fn try_from(value: Value) -> Result<Self, Self::Error> {
        match value {
            Value::Optional(o) => o
                .map(|v| T::try_from(v))
                .transpose()
                .map(|optional| optional.into()),
            _ => Err(FromValueError::new_typed::<Self>(value)),
        }
    }
}