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

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

use fnv::FnvHashMap;
use free_ranges::{FreeRanges, Range};

use std::fmt;

use crate::aspect::Aspect;
use crate::component::ComponentManager;
use crate::entity::{EntityData, EntityIter, IndexedEntity, WatchedEntityIter};
use crate::services::ServiceManager;
use crate::system::System;

pub struct Watcher<C>
where
    C: ComponentManager,
{
    pub aspect: Aspect<C>,
    pub interested: FnvHashMap<usize, IndexedEntity<C>>,
    pub ranges: FreeRanges,
}

impl<C> Watcher<C>
where
    C: ComponentManager,
{
    pub fn iter(&self) -> EntityIter<C> {
        let watched = WatchedEntityIter {
            current_range: Range { min: 1, max: 0 },
            indices: self.ranges.free_ranges(),
            entities: &self.interested,
        };

        EntityIter::Watched(watched)
    }
}

impl<C> Watcher<C>
where
    C: ComponentManager,
{
    pub fn new(aspect: Aspect<C>) -> Self {
        Watcher {
            aspect,
            interested: Default::default(),
            ranges: Default::default(),
        }
    }

    pub fn activated<M, T>(
        &mut self,
        entity: EntityData<C>,
        components: &C,
        services: &mut M,
        inner: &mut T,
    ) where
        M: ServiceManager,
        T: System<Components = C, Services = M>,
    {
        if self.aspect.check(entity, components) {
            if self
                .interested
                .insert(entity.index(), entity.__clone())
                .is_none()
            {
                self.ranges.set_free(entity.index());
            }

            inner.activated(entity, components, services);
        }
    }

    pub fn reactivated<M, T>(
        &mut self,
        entity: EntityData<C>,
        components: &C,
        services: &mut M,
        inner: &mut T,
    ) where
        M: ServiceManager,
        T: System<Components = C, Services = M>,
    {
        match (
            self.interested.contains_key(&entity.index()),
            self.aspect.check(entity, components),
        ) {
            (true, true) => inner.reactivated(entity, components, services),
            (true, false) => {
                self.interested.remove(&entity.index());
                self.ranges.set_used(entity.index());
                inner.deactivated(entity, components, services);
            }
            (false, true) => {
                self.interested.insert(entity.index(), entity.__clone());
                self.ranges.set_free(entity.index());
                inner.activated(entity, components, services);
            }
            (false, false) => {}
        }
    }

    pub fn deactivated<M, T>(
        &mut self,
        entity: EntityData<C>,
        components: &C,
        services: &mut M,
        inner: &mut T,
    ) where
        M: ServiceManager,
        T: System<Components = C, Services = M>,
    {
        if self.interested.remove(&entity.index()).is_some() {
            self.ranges.set_used(entity.index());

            inner.deactivated(entity, components, services);
        }
    }
}

impl<C> fmt::Debug for Watcher<C>
where
    C: ComponentManager,
{
    fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
        fmt.debug_struct("Watcher")
            .field("interested", &self.interested)
            .field("ranges", &self.ranges)
            .finish()
    }
}