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
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
|
use std::any::type_name;
use std::convert::Infallible;
use crate::component::{
Handle as ComponentHandle,
HandleMut as ComponentHandleMut,
IntoParts as IntoComponentParts,
Parts as ComponentParts,
};
use crate::entity::{
Handle as EntityHandle,
MatchingComponentIter as EntityMatchingComponentIter,
};
use crate::query::{
TermWithField as QueryTermWithField,
TermsBuilder as QueryTermsBuilder,
TermsBuilderInterface,
};
use crate::uid::{PairParams as UidPairParams, Uid, With as WithUid};
use crate::{Component, World};
#[derive(Debug)]
pub struct Pair<Relation, Target>
{
relation: Relation,
target: Target,
}
impl Pair<Uid, Uid>
{
#[must_use]
pub fn new<Relation: Component>(target: Uid) -> Self
{
Self { relation: Relation::id(), target }
}
#[must_use]
pub fn id(&self) -> Uid
{
Uid::new_pair(&UidPairParams {
relation: self.relation,
target: self.target,
})
}
}
impl<Target> Pair<Uid, Target>
where
Target: Component,
{
/// Returns a new pair that contains the target component as data.
pub fn new_with_comp_target<Relation: Component>(target_component: Target) -> Self
{
Self {
relation: Relation::uid(),
target: target_component,
}
}
}
impl IntoComponentParts for Pair<Uid, Uid>
{
fn into_parts(self) -> ComponentParts
{
ComponentParts::builder().name("Pair").build(self.id(), ())
}
}
impl<Target> IntoComponentParts for Pair<Uid, Target>
where
Target: Component,
{
fn into_parts(self) -> ComponentParts
{
let id = Uid::new_pair(&UidPairParams {
relation: self.relation,
target: Target::id(),
});
ComponentParts::builder()
.name("Pair")
.build(id, self.target)
}
}
impl<Relation, Target> QueryTermWithField for Pair<Relation, &Target>
where
Relation: Component,
Target: Component,
{
type Field<'a> = ComponentHandle<'a, Target>;
fn apply_to_terms_builder<const MAX_TERM_CNT: usize>(
terms_builder: &mut QueryTermsBuilder<MAX_TERM_CNT>,
)
{
terms_builder.with_required([Self::uid()]);
}
fn get_field<'world>(
entity_handle: &EntityHandle<'world>,
_world: &'world World,
) -> Self::Field<'world>
{
let target_component = entity_handle
.get_matching_components(Self::uid())
.next()
.expect("Not possible");
Self::Field::from_entity_component_ref(target_component).unwrap_or_else(|err| {
panic!(
"Creating handle to target component {} failed: {err}",
type_name::<Target>()
);
})
}
}
impl<Relation, Target> QueryTermWithField for Pair<Relation, &mut Target>
where
Relation: Component,
Target: Component,
{
type Field<'a> = ComponentHandleMut<'a, Target>;
fn apply_to_terms_builder<const MAX_TERM_CNT: usize>(
terms_builder: &mut QueryTermsBuilder<MAX_TERM_CNT>,
)
{
terms_builder.with_required([Self::uid()]);
}
fn get_field<'world>(
entity_handle: &EntityHandle<'world>,
_world: &'world World,
) -> Self::Field<'world>
{
let target_component = entity_handle
.get_matching_components(Self::uid())
.next()
.expect("Not possible");
Self::Field::from_entity_component_ref(target_component).unwrap_or_else(|err| {
panic!(
"Creating handle to target component {} failed: {err}",
type_name::<Target>()
);
})
}
}
impl<Relation> QueryTermWithField for Pair<Relation, Wildcard>
where
Relation: Component,
{
type Field<'a> = EntityTargetHandle<'a>;
fn apply_to_terms_builder<const MAX_TERM_CNT: usize>(
terms_builder: &mut QueryTermsBuilder<MAX_TERM_CNT>,
)
{
terms_builder.with_required([Self::uid()]);
}
fn get_field<'world>(
entity_handle: &EntityHandle<'world>,
world: &'world World,
) -> Self::Field<'world>
{
let first_matching_comp = entity_handle
.get_matching_components(Self::uid())
.next()
.expect("Not possible");
EntityTargetHandle {
world,
pair_uid: first_matching_comp.id(),
}
}
}
impl<Relation, Target> WithUid for Pair<Relation, &Target>
where
Relation: Component,
Target: Component,
{
fn uid() -> Uid
{
Uid::new_pair(&UidPairParams {
relation: Relation::uid(),
target: Target::uid(),
})
}
}
impl<Relation, Target> WithUid for Pair<Relation, &mut Target>
where
Relation: Component,
Target: Component,
{
fn uid() -> Uid
{
Uid::new_pair(&UidPairParams {
relation: Relation::uid(),
target: Target::uid(),
})
}
}
impl<Relation> WithUid for Pair<Relation, Wildcard>
where
Relation: Component,
{
fn uid() -> Uid
{
Uid::new_pair(&UidPairParams {
relation: Relation::uid(),
target: Wildcard::uid(),
})
}
}
impl<Relation> QueryTermWithField for &'static [Pair<Relation, Wildcard>]
where
Relation: Component,
{
type Field<'a> = HandleIter<'a>;
fn apply_to_terms_builder<const MAX_TERM_CNT: usize>(
terms_builder: &mut QueryTermsBuilder<MAX_TERM_CNT>,
)
{
terms_builder.with_required([Pair::<Relation, Wildcard>::uid()]);
}
fn get_field<'world>(
entity_handle: &EntityHandle<'world>,
world: &'world World,
) -> Self::Field<'world>
{
HandleIter {
inner: entity_handle
.get_matching_components(Pair::<Relation, Wildcard>::uid()),
world,
}
}
}
pub struct EntityTargetHandle<'world>
{
world: &'world World,
pair_uid: Uid,
}
impl EntityTargetHandle<'_>
{
#[must_use]
pub fn get_target_entity(&self) -> Option<EntityHandle<'_>>
{
let archetype = self
.world
.data
.component_storage
.get_entity_archetype(self.pair_uid.target_entity())?;
let Some(archetype_entity) =
archetype.get_entity_by_id(self.pair_uid.target_entity())
else {
unreachable!();
};
Some(EntityHandle::new(archetype, archetype_entity))
}
}
pub struct HandleIter<'a>
{
inner: EntityMatchingComponentIter<'a>,
world: &'a World,
}
impl<'a> Iterator for HandleIter<'a>
{
type Item = EntityTargetHandle<'a>;
fn next(&mut self) -> Option<Self::Item>
{
let matching_comp = self.inner.next()?;
Some(EntityTargetHandle {
world: self.world,
pair_uid: matching_comp.id(),
})
}
}
/// Relation denoting a dependency to another entity
#[derive(Debug, Default, Clone, Copy, Component)]
pub struct DependsOn;
/// Relation denoting being the child of another entity.
#[derive(Debug, Default, Clone, Copy, Component)]
pub struct ChildOf;
#[derive(Debug)]
pub struct Wildcard(Infallible);
impl Wildcard
{
pub fn uid() -> Uid
{
Uid::wildcard()
}
}
|
