conniecs 0.2.0

A simple ECS system based off of the `ecs` crate, but with some minor API adjustments and derive macros for implementing most of the boilerplate. Make sure to include the `conniecs-derive` crate as well.
Documentation 
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
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158

//! TODO: Add documentation including describing how the derive macros work

use std::ops::{Deref, DerefMut};

use crate::aspect::Aspect;
use crate::entity::{EntityData, EntityIter};
use crate::system::watcher::Watcher;
use crate::system::{Process, System};
use crate::world::DataHelper;

pub trait EntityProcess: FilteredEntitySystem {
    fn process<'a>(
        &mut self,
        entities: EntityIter<'a, Self::Components>,
        data: &mut DataHelper<Self::Components, Self::Services>,
    );
}

/// This trait is implemented automatically when you `#[derive(System)]` with the following:
///
/// ```
/// # #[macro_use] extern crate conniecs_derive; extern crate conniecs;
/// # use conniecs::{EntityIter, DataHelper};
/// # #[derive(ComponentManager)] struct Components {
/// # #[hot] pub foo: conniecs::ComponentList<Components, ()>, }
/// #[derive(System, Default)]
/// #[system_type(entity)]
/// #[aspect = "some::aspect::UnitStruct"]
/// #[process(process)]
/// struct MySystem;
/// # fn process(_: &mut MySystem, _: EntityIter<Components>, _:
/// # &mut DataHelper<Components, Services>) {}
/// # mod some { pub mod aspect { #[derive(Aspect, Copy, Clone)]
/// # #[aspect(all(foo))] pub struct UnitStruct; } }
/// # #[derive(ServiceManager, Default)] struct Services {}
/// # #[derive(SystemManager)] struct Systems {
/// # #[passive] sys: conniecs::system::EntitySystem<MySystem> }
/// # fn main() { conniecs::World::<Systems>::new(); }
/// ```
///
/// or
///
/// ```
/// # #[macro_use] extern crate conniecs_derive; extern crate conniecs;
/// # use conniecs::{EntityIter};
/// # #[derive(ComponentManager)] struct Components { #[hot] pub foo:
/// # conniecs::ComponentList<Components, String>, }
/// #[derive(System, Default)]
/// #[system_type(entity)]
/// #[aspect(all(foo))]
/// #[process = "process"]
/// struct MySystem;
///
/// type DataHelper = conniecs::DataHelper<Components, Services>;
/// fn process(_: &mut MySystem, entities: EntityIter<Components>, data: &mut DataHelper) {
///     for entity in entities {
///         println!("boop the {}", &data.components.foo[entity]);
///     }
/// }
/// # #[derive(ServiceManager, Default)] struct Services {}
/// # #[derive(SystemManager)] struct Systems {
/// # #[passive] sys: conniecs::system::EntitySystem<MySystem> }
/// # fn main() { conniecs::World::<Systems>::new(); }
/// ```
pub trait FilteredEntitySystem: System {
    fn create_aspect() -> Aspect<Self::Components>;
}

#[derive(Debug)]
pub struct EntitySystem<T>
where
    T: EntityProcess,
{
    pub inner: T,
    pub watcher: Watcher<T::Components>,
}

impl<T> Deref for EntitySystem<T>
where
    T: EntityProcess,
{
    type Target = T;
    fn deref(&self) -> &T {
        &self.inner
    }
}

impl<T> DerefMut for EntitySystem<T>
where
    T: EntityProcess,
{
    fn deref_mut(&mut self) -> &mut T {
        &mut self.inner
    }
}

impl<T> EntitySystem<T>
where
    T: EntityProcess,
{
    pub fn new() -> EntitySystem<T> {
        EntitySystem {
            inner: T::build_system(),
            watcher: Watcher::new(T::create_aspect()),
        }
    }
}

impl<T> System for EntitySystem<T>
where
    T: EntityProcess,
{
    type Components = T::Components;
    type Services = T::Services;

    fn build_system() -> Self {
        EntitySystem::new()
    }

    fn activated(
        &mut self,
        entity: EntityData<T::Components>,
        components: &T::Components,
        services: &mut T::Services,
    ) {
        self.watcher
            .activated(entity, components, services, &mut self.inner);
    }

    fn reactivated(
        &mut self,
        entity: EntityData<T::Components>,
        components: &T::Components,
        services: &mut T::Services,
    ) {
        self.watcher
            .reactivated(entity, components, services, &mut self.inner);
    }

    fn deactivated(
        &mut self,
        entity: EntityData<T::Components>,
        components: &T::Components,
        services: &mut T::Services,
    ) {
        self.watcher
            .deactivated(entity, components, services, &mut self.inner);
    }
}

impl<T> Process for EntitySystem<T>
where
    T: EntityProcess,
{
    fn process(&mut self, data: &mut DataHelper<T::Components, T::Services>) {
        self.inner.process(self.watcher.iter(), data);
    }
}