eventsys 0.1.1

A library for dispatching and processing events. Events can be handled in a deferred and/or immediate way.
Documentation 
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use std::marker::PhantomData;

pub struct Value;

pub struct NoValue;

pub struct EventError<T: 'static, V = NoValue> {
    inner: Option<T>,
    raw: RawErr<T>,
    v: PhantomData<V>,
}

impl<T: 'static, V> EventError<T, V> {
    pub const fn raw_err(&self) -> RawErr<T> {
        match self.raw {
            RawErr::UnregisteredEventType(_) => RawErr::UnregisteredEventType(PhantomData),
            RawErr::EventSize { max, is, t } => RawErr::EventSize { max, is, t },

            RawErr::RegisteredWithoutStore => RawErr::RegisteredWithoutStore,
        }
    }
}

impl<T: 'static> EventError<T, Value> {
    pub fn into_inner(self) -> T {
        // SAFETY:
        // Unwrapping this value is safe, because it is guaranteed with the marker generic Value,
        // that this Option contains a value.
        unsafe { self.inner.unwrap_unchecked() }
    }

    pub const fn event_size(value: T, err: EventSizeError) -> Self {
        Self {
            inner: Some(value),
            raw: RawErr::EventSize {
                max: err.max,
                is: err.is,
                t: PhantomData,
            },
            v: PhantomData,
        }
    }

    pub const fn unregisted_event(value: T) -> Self {
        Self {
            inner: Some(value),
            v: PhantomData,
            raw: RawErr::UnregisteredEventType(PhantomData),
        }
    }
}

impl<T: 'static> EventError<T, NoValue> {
    pub const fn unregisted_event_empty() -> Self {
        Self {
            inner: None,
            raw: RawErr::UnregisteredEventType(PhantomData),
            v: PhantomData,
        }
    }

    pub const fn event_size_empty(raw: EventSizeError) -> Self {
        Self {
            inner: None,
            raw: RawErr::EventSize {
                max: raw.max,
                is: raw.is,
                t: PhantomData,
            },
            v: PhantomData,
        }
    }

    pub const fn registered_without_store() -> Self {
        Self {
            inner: None,
            raw: RawErr::RegisteredWithoutStore,
            v: PhantomData,
        }
    }
}

impl<T: 'static, V> std::error::Error for EventError<T, V> {}

impl<T: 'static, V> std::fmt::Debug for EventError<T, V> {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        f.debug_struct("BoxedEventError")
            .field("inner", &if self.inner.is_some() { "Some" } else { "None" })
            .field("raw", &self.raw)
            .finish()
    }
}

impl<T: 'static, V> std::fmt::Display for EventError<T, V> {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        write!(f, "{}", self.raw)
    }
}

impl<T: 'static> From<EventSizeError> for EventError<T, NoValue> {
    fn from(value: EventSizeError) -> Self {
        Self::event_size_empty(value)
    }
}

#[derive(Clone, Copy)]
pub enum RawErr<T: 'static> {
    UnregisteredEventType(PhantomData<T>),
    EventSize {
        max: usize,
        is: usize,
        t: PhantomData<T>,
    },
    RegisteredWithoutStore,
}

impl<T: 'static> std::error::Error for RawErr<T> {}

impl<T: 'static> std::fmt::Debug for RawErr<T> {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        let name = std::any::type_name::<T>();
        match self {
            Self::UnregisteredEventType(_) => {
                f.debug_tuple("UnregisteredEventType").field(&name).finish()
            }
            Self::EventSize { max, is, t: _ } => f
                .debug_struct("EventSize")
                .field("max", max)
                .field("is", is)
                .field("type", &name)
                .finish(),

            Self::RegisteredWithoutStore => write!(f, "RegisteredWithListener"),
        }
    }
}

impl<T: 'static> std::fmt::Display for RawErr<T> {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        let name = std::any::type_name::<Box<T>>();

        match self {
            Self::UnregisteredEventType(_) => {
                write!(f, "Unregistered event type: {name}")
            }
            Self::EventSize { max, is, t: _ } => write!(
                f,
                "Input type {name} has incorrect size: max size: {max}  - is: {is}",
            ),

            Self::RegisteredWithoutStore => {
                write!(f, "Event type was not registered to store events")
            }
        }
    }
}

#[derive(Debug, Clone, Copy)]
pub struct EventSizeError {
    max: usize,
    is: usize,
}

impl EventSizeError {
    #[must_use]
    pub const fn new(max: usize, is: usize) -> Self {
        Self { max, is }
    }
}

impl std::error::Error for EventSizeError {}

impl std::fmt::Display for EventSizeError {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        write!(
            f,
            "Input value has incorrect size: max size: {}  - is: {}",
            self.max, self.is
        )
    }
}