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

#[cfg(test)]
mod test {
    use super::super::*;

    impl<T> PartialEq for Interval<T>
    where
        T: Eq,
    {
        fn eq(&self, other: &Self) -> bool {
            self.lo_incl == other.lo_incl && self.hi_incl == other.hi_incl
        }
    }

    fn add_helper<T>(is: &mut IntervalSet<T>, lo_incl: Option<T>, hi_incl: Option<T>) {
        is.add(Interval { lo_incl, hi_incl });
    }

    fn assert_content<T>(is: &IntervalSet<T>, exp: Vec<(Option<T>, Option<T>)>)
    where
        T: Ord + Debug,
    {
        let act = is.itvs.iter().collect::<Vec<_>>();
        let exp = exp
            .into_iter()
            .map(|(lo_incl, hi_incl)| Interval { lo_incl, hi_incl })
            .collect::<Vec<_>>();
        let exp = exp.iter().collect::<Vec<_>>();
        assert_eq!(act, exp);
    }

    #[test]
    fn merging() {
        let mut is = IntervalSet::<i32>::new();
        assert_content(&is, vec![]);
        is.merge();
        assert_content(&is, vec![]);

        // Add first itv
        add_helper(&mut is, Some(10), Some(20));
        is.merge();
        assert_content(&is, vec![(Some(10), Some(20))]);

        // Add disjoint
        add_helper(&mut is, Some(30), Some(40));
        is.merge();
        assert_content(&is, vec![(Some(10), Some(20)), (Some(30), Some(40))]);

        // Add disjoint
        add_helper(&mut is, Some(50), Some(60));
        is.merge();
        assert_content(
            &is,
            vec![
                (Some(10), Some(20)),
                (Some(30), Some(40)),
                (Some(50), Some(60)),
            ],
        );

        // Add subsumed
        add_helper(&mut is, Some(13), Some(17));
        is.merge();
        assert_content(
            &is,
            vec![
                (Some(10), Some(20)),
                (Some(30), Some(40)),
                (Some(50), Some(60)),
            ],
        );

        // Add disjoint, with gaps of one
        add_helper(&mut is, Some(21), Some(29));
        is.merge();
        assert_content(
            &is,
            vec![
                (Some(10), Some(20)),
                (Some(21), Some(29)),
                (Some(30), Some(40)),
                (Some(50), Some(60)),
            ],
        );

        // Expand one itv, low-ward
        add_helper(&mut is, Some(47), Some(55));
        is.merge();
        assert_content(
            &is,
            vec![
                (Some(10), Some(20)),
                (Some(21), Some(29)),
                (Some(30), Some(40)),
                (Some(47), Some(60)),
            ],
        );

        // Expand one itv, high-ward
        add_helper(&mut is, Some(35), Some(43));
        is.merge();
        assert_content(
            &is,
            vec![
                (Some(10), Some(20)),
                (Some(21), Some(29)),
                (Some(30), Some(43)),
                (Some(47), Some(60)),
            ],
        );

        // Unify two existing itvs with one new itv
        add_helper(&mut is, Some(43), Some(47));
        is.merge();
        assert_content(
            &is,
            vec![
                (Some(10), Some(20)),
                (Some(21), Some(29)),
                (Some(30), Some(60)),
            ],
        );

        // Add a (-inf ... x]
        add_helper(&mut is, None, Some(10));
        is.merge();
        assert_content(
            &is,
            vec![(None, Some(20)), (Some(21), Some(29)), (Some(30), Some(60))],
        );

        // And a [x ... +inf)
        add_helper(&mut is, Some(29), None);
        is.merge();
        assert_content(&is, vec![(None, Some(20)), (Some(21), None)]);

        // Add a (-inf ... +inf)
        add_helper(&mut is, None, None);
        is.merge();
        assert_content(&is, vec![(None, None)]);

        // Add subsumed
        add_helper(&mut is, Some(10), Some(20));
        is.merge();
        assert_content(&is, vec![(None, None)]);
    }

    fn assert_overlapping<T>(mis: &MergedIntervalSet<T>, points: Vec<T>, exp: bool) -> Result<()>
    where
        T: Ord + Debug,
    {
        let act = mis.overlaps_with(points.into_iter())?;
        assert_eq!(exp, act);
        Ok(())
    }

    #[test]
    fn overlapping() -> Result<()> {
        let mut is = IntervalSet::<i32>::new();

        let mis = is.merge();
        assert_overlapping(&mis, vec![1, 2, 3], false)?;

        add_helper(&mut is, Some(20), Some(30));
        let mis = is.merge();
        assert_overlapping(&mis, vec![15, 35], false)?;
        assert_overlapping(&mis, vec![25], true)?;
        assert_overlapping(&mis, vec![15, 30, 35], true)?;

        add_helper(&mut is, None, Some(10));
        let mis = is.merge();
        assert_overlapping(&mis, vec![15, 35], false)?;
        assert_overlapping(&mis, vec![-999], true)?;
        assert_overlapping(&mis, vec![10], true)?;
        assert_overlapping(&mis, vec![20], true)?;
        assert_overlapping(&mis, vec![5, 15, 25, 35], true)?;

        add_helper(&mut is, Some(40), None);
        let mis = is.merge();
        assert_overlapping(&mis, vec![15, 35], false)?;
        assert_overlapping(&mis, vec![-999], true)?;
        assert_overlapping(&mis, vec![10], true)?;
        assert_overlapping(&mis, vec![20], true)?;
        assert_overlapping(&mis, vec![40], true)?;
        assert_overlapping(&mis, vec![5, 15, 25, 35, 45], true)?;

        Ok(())
    }
}