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

use std::{cmp, collections, hash};

#[cfg(feature = "experimental-inspect")]
use crate::inspect::types::TypeInfo;
use crate::{
    types::set::new_from_iter, types::PySet, FromPyObject, IntoPy, PyAny, PyObject, PyResult,
    Python, ToPyObject,
};

impl<T, S> ToPyObject for collections::HashSet<T, S>
where
    T: hash::Hash + Eq + ToPyObject,
    S: hash::BuildHasher + Default,
{
    fn to_object(&self, py: Python<'_>) -> PyObject {
        new_from_iter(py, self)
            .expect("Failed to create Python set from HashSet")
            .into()
    }
}

impl<T> ToPyObject for collections::BTreeSet<T>
where
    T: hash::Hash + Eq + ToPyObject,
{
    fn to_object(&self, py: Python<'_>) -> PyObject {
        new_from_iter(py, self)
            .expect("Failed to create Python set from BTreeSet")
            .into()
    }
}

impl<K, S> IntoPy<PyObject> for collections::HashSet<K, S>
where
    K: IntoPy<PyObject> + Eq + hash::Hash,
    S: hash::BuildHasher + Default,
{
    fn into_py(self, py: Python<'_>) -> PyObject {
        new_from_iter(py, self.into_iter().map(|item| item.into_py(py)))
            .expect("Failed to create Python set from HashSet")
            .into()
    }

    #[cfg(feature = "experimental-inspect")]
    fn type_output() -> TypeInfo {
        TypeInfo::set_of(K::type_output())
    }
}

impl<'source, K, S> FromPyObject<'source> for collections::HashSet<K, S>
where
    K: FromPyObject<'source> + cmp::Eq + hash::Hash,
    S: hash::BuildHasher + Default,
{
    fn extract(ob: &'source PyAny) -> PyResult<Self> {
        let set: &PySet = ob.downcast()?;
        set.iter().map(K::extract).collect()
    }

    #[cfg(feature = "experimental-inspect")]
    fn type_input() -> TypeInfo {
        TypeInfo::set_of(K::type_input())
    }
}

impl<K> IntoPy<PyObject> for collections::BTreeSet<K>
where
    K: IntoPy<PyObject> + cmp::Ord,
{
    fn into_py(self, py: Python<'_>) -> PyObject {
        new_from_iter(py, self.into_iter().map(|item| item.into_py(py)))
            .expect("Failed to create Python set from BTreeSet")
            .into()
    }

    #[cfg(feature = "experimental-inspect")]
    fn type_output() -> TypeInfo {
        TypeInfo::set_of(K::type_output())
    }
}

impl<'source, K> FromPyObject<'source> for collections::BTreeSet<K>
where
    K: FromPyObject<'source> + cmp::Ord,
{
    fn extract(ob: &'source PyAny) -> PyResult<Self> {
        let set: &PySet = ob.downcast()?;
        set.iter().map(K::extract).collect()
    }

    #[cfg(feature = "experimental-inspect")]
    fn type_input() -> TypeInfo {
        TypeInfo::set_of(K::type_input())
    }
}

#[cfg(test)]
mod tests {
    use super::PySet;
    use crate::{IntoPy, PyObject, Python, ToPyObject};
    use std::collections::{BTreeSet, HashSet};

    #[test]
    fn test_extract_hashset() {
        Python::with_gil(|py| {
            let set = PySet::new(py, &[1, 2, 3, 4, 5]).unwrap();
            let hash_set: HashSet<usize> = set.extract().unwrap();
            assert_eq!(hash_set, [1, 2, 3, 4, 5].iter().copied().collect());
        });
    }

    #[test]
    fn test_extract_btreeset() {
        Python::with_gil(|py| {
            let set = PySet::new(py, &[1, 2, 3, 4, 5]).unwrap();
            let hash_set: BTreeSet<usize> = set.extract().unwrap();
            assert_eq!(hash_set, [1, 2, 3, 4, 5].iter().copied().collect());
        });
    }

    #[test]
    fn test_set_into_py() {
        Python::with_gil(|py| {
            let bt: BTreeSet<u64> = [1, 2, 3, 4, 5].iter().cloned().collect();
            let hs: HashSet<u64> = [1, 2, 3, 4, 5].iter().cloned().collect();

            let bto: PyObject = bt.clone().into_py(py);
            let hso: PyObject = hs.clone().into_py(py);

            assert_eq!(bt, bto.extract(py).unwrap());
            assert_eq!(hs, hso.extract(py).unwrap());
        });
    }

    #[test]
    fn test_set_to_object() {
        Python::with_gil(|py| {
            let bt: BTreeSet<u64> = [1, 2, 3, 4, 5].iter().cloned().collect();
            let hs: HashSet<u64> = [1, 2, 3, 4, 5].iter().cloned().collect();

            let bto: PyObject = bt.to_object(py);
            let hso: PyObject = hs.to_object(py);

            assert_eq!(bt, bto.extract(py).unwrap());
            assert_eq!(hs, hso.extract(py).unwrap());
        });
    }
}