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
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
|
use std::any::Any;
use std::collections::HashSet;
use std::iter::{Filter, Flatten, Map};
use std::marker::PhantomData;
use std::sync::Arc;
use crate::component::storage::{
Archetype,
ArchetypeRefIter,
Storage as ComponentStorage,
};
use crate::component::{Metadata as ComponentMetadata, Sequence as ComponentSequence};
use crate::lock::{Lock, ReadGuard};
use crate::query::options::Options;
use crate::system::{
NoInitParamFlag as NoInitSystemParamFlag,
Param as SystemParam,
System,
};
use crate::{EntityComponent, World, WorldData};
pub mod options;
#[derive(Debug)]
pub struct Query<'world, Comps, OptionsT = ()>
where
Comps: ComponentSequence,
{
component_storage: ReadGuard<'world, ComponentStorage>,
_pd: PhantomData<(Comps, OptionsT)>,
}
impl<'world, Comps, OptionsT> Query<'world, Comps, OptionsT>
where
Comps: ComponentSequence,
OptionsT: Options,
{
/// Iterates over the entities matching this query.
#[must_use]
pub fn iter<'this>(&'this self) -> ComponentIter<'world, Comps>
where
'this: 'world,
{
#[cfg(feature = "debug")]
tracing::debug!("Searching for {}", std::any::type_name::<Comps>());
#[allow(clippy::map_flatten)]
ComponentIter {
entities: self
.component_storage
.find_entities(Comps::metadata())
.map((|archetype| archetype.components.as_slice()) as ComponentIterMapFn)
.flatten()
.filter(|components| OptionsT::entity_filter(*components)),
comps_pd: PhantomData,
}
}
pub(crate) fn new(component_storage: &'world Arc<Lock<ComponentStorage>>) -> Self
{
Self {
component_storage: component_storage
.read_nonblock()
.expect("Failed to acquire read-only component storage lock"),
_pd: PhantomData,
}
}
}
impl<'world, Comps, OptionsT> IntoIterator for &'world Query<'world, Comps, OptionsT>
where
Comps: ComponentSequence,
OptionsT: Options,
{
type IntoIter = ComponentIter<'world, Comps>;
type Item = Comps::Refs<'world>;
fn into_iter(self) -> Self::IntoIter
{
self.iter()
}
}
unsafe impl<'world, Comps, OptionsT> SystemParam<'world>
for Query<'world, Comps, OptionsT>
where
Comps: ComponentSequence,
OptionsT: Options,
{
type Flags = NoInitSystemParamFlag;
type Input = ();
fn initialize<SystemImpl>(
_system: &mut impl System<'world, SystemImpl>,
_input: Self::Input,
)
{
}
fn new<SystemImpl>(
_system: &'world impl System<'world, SystemImpl>,
world: &'world World,
) -> Self
{
Self::new(&world.data.component_storage)
}
fn is_compatible<Other: SystemParam<'world>>() -> bool
{
let other_comparable = Other::get_comparable();
let Some(other_query_component_ids) =
other_comparable.downcast_ref::<QueryComponentIds>()
else {
return true;
};
!other_query_component_ids.contains_component_in::<Comps>()
}
fn get_comparable() -> Box<dyn Any>
{
Box::new(QueryComponentIds { component_ids: Comps::metadata() })
}
#[cfg_attr(feature = "debug", tracing::instrument(skip_all))]
fn prepare(world_data: &WorldData)
{
let mut component_storage_lock = world_data
.component_storage
.write_nonblock()
.expect("Failed to acquire read-write component storage lock");
#[cfg(feature = "debug")]
tracing::debug!(
"Adding archetypes lookup entry for components: ({})",
std::any::type_name::<Comps>()
);
component_storage_lock.add_archetype_lookup_entry(Comps::metadata());
drop(component_storage_lock);
Comps::prepare(world_data);
}
}
type ComponentIterMapFn = for<'a> fn(&'a Archetype) -> &'a [Vec<EntityComponent>];
type ComponentIterFilterFn = for<'a, 'b> fn(&'a &'b Vec<EntityComponent>) -> bool;
pub struct ComponentIter<'world, Comps>
{
entities: Filter<
Flatten<Map<ArchetypeRefIter<'world>, ComponentIterMapFn>>,
ComponentIterFilterFn,
>,
comps_pd: PhantomData<Comps>,
}
impl<'world, Comps> Iterator for ComponentIter<'world, Comps>
where
Comps: ComponentSequence + 'world,
{
type Item = Comps::Refs<'world>;
fn next(&mut self) -> Option<Self::Item>
{
Some(Comps::from_components(self.entities.next()?.iter()))
}
}
#[derive(Debug)]
struct QueryComponentIds
{
component_ids: Vec<ComponentMetadata>,
}
impl QueryComponentIds
{
fn contains_component_in<OtherComps>(&self) -> bool
where
OtherComps: ComponentSequence,
{
let other_ids = OtherComps::metadata()
.into_iter()
.map(|component_metadata| component_metadata.id)
.collect::<HashSet<_>>();
self.component_ids
.iter()
.all(|component_metadata| other_ids.contains(&component_metadata.id))
}
}
|
