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

// This file is part of ICU4X. For terms of use, please see the file
// called LICENSE at the top level of the ICU4X source tree
// (online at: https://github.com/unicode-org/icu4x/blob/main/LICENSE ).

use super::ZeroHashMap;
use crate::{
    map::{ZeroMapKV, ZeroVecLike},
    ZeroVec,
};

use serde::{de, Deserialize, Serialize};

impl<'a, K, V> Serialize for ZeroHashMap<'a, K, V>
where
    K: ZeroMapKV<'a> + Serialize + ?Sized,
    V: ZeroMapKV<'a> + Serialize + ?Sized,
    K::Container: Serialize,
    V::Container: Serialize,
{
    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
    where
        S: serde::Serializer,
    {
        (&self.displacements, &self.keys, &self.values).serialize(serializer)
    }
}

impl<'de, 'a, K, V> Deserialize<'de> for ZeroHashMap<'a, K, V>
where
    K: ZeroMapKV<'a> + ?Sized,
    V: ZeroMapKV<'a> + ?Sized,
    K::Container: Deserialize<'de>,
    V::Container: Deserialize<'de>,
    'de: 'a,
{
    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
    where
        D: serde::Deserializer<'de>,
    {
        let (displacements, keys, values): (ZeroVec<(u32, u32)>, K::Container, V::Container) =
            Deserialize::deserialize(deserializer)?;
        if keys.zvl_len() != values.zvl_len() {
            return Err(de::Error::custom(
                "Mismatched key and value sizes in ZeroHashMap",
            ));
        }
        if displacements.zvl_len() != keys.zvl_len() {
            return Err(de::Error::custom(
                "Mismatched displacements and key, value sizes in ZeroHashMap",
            ));
        }
        Ok(Self {
            displacements,
            keys,
            values,
        })
    }
}

#[cfg(test)]
mod test {
    use crate::{VarZeroVec, ZeroHashMap, ZeroVec};
    use serde::{Deserialize, Serialize};

    const JSON_STR: &str = "[[[0,0],[0,1],[0,1]],[1,2,0],[\"b\",\"c\",\"a\"]]";

    const BINCODE_BYTES: &[u8] = &[
        24, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0,
        0, 0, 12, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0, 9, 0, 0, 0, 0, 0, 0, 0,
        3, 0, 1, 0, 2, 0, 98, 99, 97,
    ];

    #[derive(Serialize, Deserialize)]
    struct DeriveTestZeroHashMap<'data> {
        #[serde(borrow)]
        _data: ZeroHashMap<'data, str, [u8]>,
    }

    fn make_zerohashmap() -> ZeroHashMap<'static, u32, str> {
        ZeroHashMap::from_iter([(0, "a"), (1, "b"), (2, "c")])
    }

    fn build_invalid_hashmap_str(
        displacements: Vec<(u32, u32)>,
        keys: Vec<u32>,
        values: Vec<&str>,
    ) -> String {
        let invalid_hm: ZeroHashMap<u32, str> = ZeroHashMap {
            displacements: ZeroVec::alloc_from_slice(&displacements),
            keys: ZeroVec::alloc_from_slice(&keys),
            values: VarZeroVec::<str>::from(&values),
        };
        serde_json::to_string(&invalid_hm).expect("serialize")
    }

    #[test]
    fn test_invalid_deser_zhm() {
        // Invalid hashmap |keys| != |values|
        let mut invalid_hm_str =
            build_invalid_hashmap_str(vec![(0, 1), (0, 0)], vec![1, 2], vec!["a", "b", "c"]);

        assert_eq!(
            serde_json::from_str::<ZeroHashMap<u32, str>>(&invalid_hm_str)
                .unwrap_err()
                .to_string(),
            "Mismatched key and value sizes in ZeroHashMap"
        );

        // Invalid hashmap |displacements| != |keys| == |values|
        // |displacements| = 2, |keys| = 3, |values| = 3
        invalid_hm_str =
            build_invalid_hashmap_str(vec![(0, 1), (0, 0)], vec![2, 1, 0], vec!["a", "b", "c"]);

        assert_eq!(
            serde_json::from_str::<ZeroHashMap<u32, str>>(&invalid_hm_str)
                .unwrap_err()
                .to_string(),
            "Mismatched displacements and key, value sizes in ZeroHashMap"
        );
    }

    #[test]
    fn test_serde_valid_deser_zhm() {
        let hm = make_zerohashmap();
        let json_str = serde_json::to_string(&hm).expect("serialize");
        assert_eq!(json_str, JSON_STR);
        let deserialized_hm: ZeroHashMap<u32, str> =
            serde_json::from_str(JSON_STR).expect("deserialize");
        assert_eq!(
            hm.iter().collect::<Vec<_>>(),
            deserialized_hm.iter().collect::<Vec<_>>()
        );
    }

    #[test]
    fn test_bincode_zhm() {
        let hm = make_zerohashmap();
        let bincode_bytes = bincode::serialize(&hm).expect("serialize");
        assert_eq!(bincode_bytes, BINCODE_BYTES);
        let deserialized_hm: ZeroHashMap<u32, str> =
            bincode::deserialize(BINCODE_BYTES).expect("deserialize");
        assert_eq!(
            hm.iter().collect::<Vec<_>>(),
            deserialized_hm.iter().collect::<Vec<_>>()
        );
    }
}