solverforge-scoring 0.19.14

Incremental constraint scoring for SolverForge
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

use super::super::{BindingId, DenseRowStore, Leaf, RowHandle};
use super::Operator;
use crate::stream::collection_extract::CollectionExtract;
use std::marker::PhantomData;

pub struct CollectionNode<S, E> {
    extractor: E,
    binding: BindingId,
    rows: DenseRowStore<usize>,
    handles: Vec<Option<RowHandle>>,
    marker: PhantomData<fn() -> S>,
}

impl<S, E> CollectionNode<S, E> {
    /* Borrows the source extractor this node was built from. */
    pub(crate) fn extractor(&self) -> &E {
        &self.extractor
    }
    pub fn new(extractor: E, binding: u32) -> Self {
        Self {
            extractor,
            binding: BindingId(binding),
            rows: DenseRowStore::new(),
            handles: Vec::new(),
            marker: PhantomData,
        }
    }
}

impl<S: 'static, E: CollectionExtract<S> + 'static> Operator<S> for CollectionNode<S, E>
where
    E::Item: 'static,
{
    type View<'a> = Leaf<'a, E::Item>;
    type Evaluation = ();
    #[inline]
    fn prepare_evaluation(&self, _: &S) {}
    #[inline]
    fn visit_evaluation<'a>(
        &'a self,
        solution: &'a S,
        _: &'a (),
        visitor: &mut impl FnMut(Self::View<'a>),
    ) {
        for (index, entity) in self.extractor.extract(solution).iter().enumerate() {
            if self.extractor.contains(solution, entity) {
                visitor(Leaf::new(entity, index));
            }
        }
    }
    fn clear(&mut self) {
        self.rows.clear();
        self.handles.clear();
    }
    fn initialize(&mut self, solution: &S) {
        self.rows.clear();
        self.handles.clear();
        for (index, entity) in self.extractor.extract(solution).iter().enumerate() {
            let handle = self
                .extractor
                .contains(solution, entity)
                .then(|| self.rows.insert(index));
            self.handles.push(handle);
        }
    }
    fn handles(&self) -> Vec<RowHandle> {
        self.rows.iter().map(|(h, _)| h).collect()
    }
    fn resolve<'a>(&'a self, solution: &'a S, handle: RowHandle) -> Option<Self::View<'a>> {
        let index = *self.rows.get(handle)?;
        Some(Leaf::new(
            self.extractor.extract(solution).get(index)?,
            index,
        ))
    }
    fn visit_provenance(&self, handle: RowHandle, visitor: &mut impl FnMut(u32, usize, usize)) {
        if let Some(index) = self.rows.get(handle) {
            let descriptor = match self.extractor.change_source() {
                crate::stream::collection_extract::ChangeSource::Descriptor(d) => d,
                _ => usize::MAX,
            };
            visitor(self.binding.0, descriptor, *index);
        }
    }
    fn retract(
        &mut self,
        _: &S,
        descriptor: usize,
        index: usize,
        removed: &mut Vec<RowHandle>,
        _inserted: &mut Vec<RowHandle>,
    ) {
        removed.clear();
        if !self
            .extractor
            .change_source()
            .assert_localizes(descriptor, "relational source")
        {
            return;
        }
        if let Some(slot) = self.handles.get_mut(index) {
            if let Some(handle) = slot.take() {
                self.rows.retract(handle);
                removed.push(handle);
            }
        }
    }
    fn insert(
        &mut self,
        solution: &S,
        descriptor: usize,
        index: usize,
        _removed: &mut Vec<RowHandle>,
        inserted: &mut Vec<RowHandle>,
    ) {
        inserted.clear();
        if !self
            .extractor
            .change_source()
            .assert_localizes(descriptor, "relational source")
        {
            return;
        }
        if self.handles.get(index).is_some_and(Option::is_some) {
            return;
        }
        if let Some(entity) = self.extractor.extract(solution).get(index) {
            if self.extractor.contains(solution, entity) {
                let handle = self.rows.insert(index);
                self.handles.resize(self.handles.len().max(index + 1), None);
                self.handles[index] = Some(handle);
                inserted.push(handle);
            }
        }
    }
}