1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137

use crate::reactor::*;

macro_rules! impl_reactor_for_arrays {
    () => {};

    ( $head:ident $(, $tail:ident)* $(,)? ) => {
        impl_reactor_for_arrays!($($tail,)*);

        /// Notifies all [`Reactor`]s in the array in order.
        ///
        /// <small>Currently implemented for arrays of up to 32 elements.</small>
        ///
        /// # Example
        ///
        /// ```rust
        /// use reducer::*;
        ///
        /// struct State { /* ... */ }
        /// struct Action { /* ... */ }
        ///
        /// impl Reducer<Action> for State {
        ///     fn reduce(&mut self, action: Action) {
        ///         // ...
        ///     }
        /// }
        ///
        /// struct Actor { /* ... */ }
        /// struct ActorError(/*...*/);
        ///
        /// impl Reactor<State> for Actor {
        ///     type Error = ActorError;
        ///     fn react(&mut self, state: &State) -> Result<(), Self::Error> {
        ///         // ...
        ///         Ok(())
        ///     }
        /// }
        ///
        /// let a = Actor { /* ... */ };
        /// let b = Actor { /* ... */ };
        /// // ...
        /// let z = Actor { /* ... */ };
        ///
        /// let mut store = Store::new(State { /* ... */ }, [a, b, /* ..., */ z]);
        ///
        /// // All actors get notified of state changes.
        /// store.dispatch(Action { /* ... */ });
        /// ```
        impl<S, T> Reactor<S> for [T; count!($($tail,)*)]
        where
            T: Reactor<S>,
        {
            type Error = T::Error;

            fn react(&mut self, state: &S) -> Result<(), Self::Error> {
                self[..].react(state)
            }
        }
    };
}

impl_reactor_for_arrays!(
    _32, _31, _30, _29, _28, _27, _26, _25, _24, _23, _22, _21, _20, _19, _18, _17, _16, _15, _14,
    _13, _12, _11, _10, _09, _08, _07, _06, _05, _04, _03, _02, _01, _00
);

#[cfg(test)]
mod tests {
    use crate::mock::*;
    use proptest::prelude::*;

    mod ok {
        use super::*;

        macro_rules! test_reactor_for_arrays {
            () => {};

            ( $head:ident $(, $tail:ident)* $(,)? ) => {
                proptest! {
                    #[test]
                    fn $head(states: Vec<u8>) {
                        let mut reactors: [Mock<_>; count!($($tail,)*)] = Default::default();

                        for (i, state) in states.iter().enumerate() {
                            assert_eq!(react(&mut reactors, state), Ok(()));

                            for reactor in &reactors {
                                assert_eq!(reactor.calls(), &states[0..=i])
                            }
                        }
                    }
                }

                test_reactor_for_arrays!($($tail,)*);
            };
        }

        test_reactor_for_arrays!(
            _32, _31, _30, _29, _28, _27, _26, _25, _24, _23, _22, _21, _20, _19, _18, _17, _16,
            _15, _14, _13, _12, _11, _10, _09, _08, _07, _06, _05, _04, _03, _02, _01, _00
        );
    }

    mod err {
        use super::*;

        macro_rules! test_reactor_for_arrays {
            () => {};

            ( $head:ident $(, $tail:ident)* $(,)? ) => {
                proptest! {
                    #[test]
                    fn $head(state: u8, error: String, at in 0usize..=count!($($tail,)*)) {
                        let mut reactors: [Mock<_, _>; count!($($tail,)*) + 1] = Default::default();
                        reactors[at].fail_if(state, &error[..]);

                        assert_eq!(react(&mut reactors, &state), Err(&error[..]));

                        for reactor in reactors.iter().take(at + 1) {
                            assert_eq!(reactor.calls(), &[state])
                        }

                        for reactor in reactors.iter().skip(at + 1) {
                            assert_eq!(reactor.calls(), &[])
                        }
                    }
                }

                test_reactor_for_arrays!($($tail,)*);
            };
        }

        test_reactor_for_arrays!(
            _32, _31, _30, _29, _28, _27, _26, _25, _24, _23, _22, _21, _20, _19, _18, _17, _16,
            _15, _14, _13, _12, _11, _10, _09, _08, _07, _06, _05, _04, _03, _02, _01
        );
    }
}