ordmask 2.1.0

A library for efficient range-based set operations and membership checking
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
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

use ordmask::{OrdMask, ordmask};

// ============================================================================
// Helper macro for testing with descriptive error messages
// ============================================================================

macro_rules! assert_mask_eq {
    ($left:expr, $right:expr, $msg:expr) => {
        assert_eq!(
            $left, $right,
            "{}: left={:?}, right={:?}",
            $msg, $left, $right
        );
    };
}

// ============================================================================
// Intersection Tests
// ============================================================================

#[test]
fn test_intersection_basic() {
    let test_cases: Vec<((Vec<i32>, bool), (Vec<i32>, bool), (Vec<i32>, bool))> = vec![
        // (mask1, mask2, expected)
        // Overlapping ranges
        (
            (vec![0, 10], false),
            (vec![5, 15], false),
            (vec![5, 10], false),
        ),
        // Non-overlapping ranges - empty intersection
        (
            (vec![0, 5], false),
            (vec![10, 15], false),
            (vec![], false),
        ),
        // One contained in another
        (
            (vec![0, 20], false),
            (vec![5, 10], false),
            (vec![5, 10], false),
        ),
        // Same range
        (
            (vec![0, 10], false),
            (vec![0, 10], false),
            (vec![0, 10], false),
        ),
        // Edge touching
        (
            (vec![0, 5], false),
            (vec![5, 10], false),
            (vec![], false), // [0,5) ∩ [5,10) = empty
        ),
    ];

    for ((kp1, rev1), (kp2, rev2), (expected_kp, expected_rev)) in test_cases {
        let mask1: OrdMask<i32> = unsafe { OrdMask::with_checked(kp1, rev1) };
        let mask2: OrdMask<i32> = unsafe { OrdMask::with_checked(kp2, rev2) };
        let expected: OrdMask<i32> = unsafe { OrdMask::with_checked(expected_kp, expected_rev) };
        let result = OrdMask::intersection(&[&mask1, &mask2]);
        assert_mask_eq!(result, expected, "intersection basic test failed");
    }
}

#[test]
fn test_intersection_with_empty() {
    // Empty set annihilates intersection
    let empty = ordmask![];
    let mask = ordmask![0, 10];
    let universal = ordmask![..];

    assert_eq!(OrdMask::intersection(&[&empty, &mask]), empty);
    assert_eq!(OrdMask::intersection(&[&mask, &empty]), empty);
    assert_eq!(OrdMask::intersection(&[&empty, &empty]), empty);
    assert_eq!(OrdMask::intersection(&[&empty, &universal]), empty);
}

#[test]
fn test_intersection_with_universal() {
    // Universal set is identity for intersection
    let universal = ordmask![..];
    let mask = ordmask![0, 10];
    let empty = ordmask![];

    assert_eq!(OrdMask::intersection(&[&universal, &mask]), mask);
    assert_eq!(OrdMask::intersection(&[&mask, &universal]), mask);
    assert_eq!(OrdMask::intersection(&[&universal, &universal]), universal);
    assert_eq!(OrdMask::intersection(&[&universal, &empty]), empty);
}

#[test]
fn test_intersection_with_reversed() {
    // Reversed (complement) sets
    let reversed1 = ordmask![.., 0, 10]; // (-∞, 0) ∪ [10, ∞)
    let reversed2 = ordmask![.., 5, 15]; // (-∞, 5) ∪ [15, ∞)
    let normal = ordmask![0, 10];

    // Intersection of two reversed
    let result = OrdMask::intersection(&[&reversed1, &reversed2]);
    assert_eq!(result, ordmask![.., 0, 15]);

    // Intersection of reversed with normal
    let result = OrdMask::intersection(&[&reversed1, &normal]);
    assert_eq!(result, ordmask![]);

    // Intersection of reversed2 with normal
    // reversed2 = (-∞, 5) ∪ [15, ∞), normal = [0, 10)
    // Intersection = [0, 5)
    let result = OrdMask::intersection(&[&reversed2, &normal]);
    assert_eq!(result, ordmask![0, 5]);
}

#[test]
fn test_intersection_with_infinite() {
    // Infinite sets (unbounded on one side)
    let inf_right = ordmask![0]; // [0, ∞)
    let inf_left = ordmask![.., 10]; // (-∞, 10)
    let finite = ordmask![5, 15];

    // Intersection of inf_right and inf_left
    let result = OrdMask::intersection(&[&inf_right, &inf_left]);
    assert_eq!(result, ordmask![0, 10]);

    // Intersection of inf_right and finite
    let result = OrdMask::intersection(&[&inf_right, &finite]);
    assert_eq!(result, ordmask![5, 15]);

    // Intersection of inf_left and finite
    let result = OrdMask::intersection(&[&inf_left, &finite]);
    assert_eq!(result, ordmask![5, 10]);
}

#[test]
fn test_intersection_at_edge() {
    let a = ordmask![.., 0]; // empty
    let b = ordmask![u32::MAX]; // max only
    let c = ordmask![0, 10]; // from min
    let d = ordmask![100, u32::MAX]; // to max - 1
    let e = ordmask![5, 15]; // normal

    assert_eq!(OrdMask::intersection(&[&a, &b]), a);
    assert_eq!(OrdMask::intersection(&[&b, &a]), a);

    assert_eq!(OrdMask::intersection(&[&a, &c]), a);
    assert_eq!(OrdMask::intersection(&[&c, &a]), a);

    assert_eq!(OrdMask::intersection(&[&a, &d]), a);
    assert_eq!(OrdMask::intersection(&[&d, &a]), a);

    assert_eq!(OrdMask::intersection(&[&a, &e]), a);
    assert_eq!(OrdMask::intersection(&[&e, &a]), a);

    assert_eq!(OrdMask::intersection(&[&b, &c]), ordmask![]);
    assert_eq!(OrdMask::intersection(&[&c, &b]), ordmask![]);

    assert_eq!(OrdMask::intersection(&[&b, &d]), ordmask![]);
    assert_eq!(OrdMask::intersection(&[&d, &b]), ordmask![]);

    assert_eq!(OrdMask::intersection(&[&b, &e]), ordmask![]);
    assert_eq!(OrdMask::intersection(&[&e, &b]), ordmask![]);

    assert_eq!(OrdMask::intersection(&[&c, &d]), ordmask![]);
    assert_eq!(OrdMask::intersection(&[&d, &c]), ordmask![]);

    assert_eq!(OrdMask::intersection(&[&c, &e]), ordmask![5, 10]);
    assert_eq!(OrdMask::intersection(&[&e, &c]), ordmask![5, 10]);

    assert_eq!(OrdMask::intersection(&[&d, &e]), ordmask![]);
    assert_eq!(OrdMask::intersection(&[&e, &d]), ordmask![]);
}

#[test]
fn test_intersection_operator() {
    let mask1 = ordmask![0, 10];
    let mask2 = ordmask![5, 15];
    let expected = ordmask![5, 10];

    // Test all operator combinations
    assert_eq!(&mask1 & &mask2, expected);
    assert_eq!(mask1.clone() & mask2.clone(), expected);
    assert_eq!(&mask1 & mask2.clone(), expected);
    assert_eq!(mask1.clone() & &mask2, expected);
    assert_eq!(mask1 & mask2, expected);
}

#[test]
fn test_intersection_multiple() {
    // Intersection of multiple masks
    let mask1 = ordmask![0, 20];
    let mask2 = ordmask![5, 15];
    let mask3 = ordmask![10, 25];
    let result = OrdMask::intersection(&[&mask1, &mask2, &mask3]);
    assert_eq!(result, ordmask![10, 15]);

    // Non-overlapping intersection with multiple
    let mask1 = ordmask![0, 5];
    let mask2 = ordmask![10, 15];
    let mask3 = ordmask![20, 25];
    let result = OrdMask::intersection(&[&mask1, &mask2, &mask3]);
    assert_eq!(result, ordmask![]);
}

#[test]
fn test_intersection_complex_ranges() {
    // Multiple ranges in each mask
    let mask1 = ordmask![0, 5, 10, 15, 20, 25];
    let mask2 = ordmask![3, 7, 12, 18, 22, 30];
    let result = OrdMask::intersection(&[&mask1, &mask2]);
    assert_eq!(result, ordmask![3, 5, 12, 15, 22, 25]);
}