/rust/registry/src/index.crates.io-1949cf8c6b5b557f/sval-2.16.0/src/data/map.rs
Line | Count | Source |
1 | | use crate::{std::fmt, Result, Stream, Value}; |
2 | | |
3 | | /** |
4 | | An adapter that streams a slice of key-value pairs as a map. |
5 | | */ |
6 | | #[repr(transparent)] |
7 | | pub struct MapSlice<K, V>([(K, V)]); |
8 | | |
9 | | impl<K, V> MapSlice<K, V> { |
10 | | /** |
11 | | Treat a slice of key-value pairs as a map. |
12 | | */ |
13 | 0 | pub const fn new<'a>(map: &'a [(K, V)]) -> &'a Self { |
14 | | // SAFETY: `MapSlice` and `[(K, V)]` have the same ABI |
15 | 0 | unsafe { &*(map as *const _ as *const MapSlice<K, V>) } |
16 | 0 | } |
17 | | |
18 | | /** |
19 | | Get a reference to the underlying slice. |
20 | | */ |
21 | 0 | pub const fn as_slice(&self) -> &[(K, V)] { |
22 | 0 | &self.0 |
23 | 0 | } |
24 | | } |
25 | | |
26 | | impl<K: fmt::Debug, V: fmt::Debug> fmt::Debug for MapSlice<K, V> { |
27 | 0 | fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { |
28 | 0 | fmt::Debug::fmt(&self.0, f) |
29 | 0 | } |
30 | | } |
31 | | |
32 | | impl<K, V> AsRef<[(K, V)]> for MapSlice<K, V> { |
33 | 0 | fn as_ref(&self) -> &[(K, V)] { |
34 | 0 | &self.0 |
35 | 0 | } |
36 | | } |
37 | | |
38 | | impl<K: Value, V: Value> Value for MapSlice<K, V> { |
39 | 0 | fn stream<'sval, S: Stream<'sval> + ?Sized>(&'sval self, stream: &mut S) -> Result { |
40 | 0 | stream.map_begin(Some(self.0.len()))?; |
41 | | |
42 | 0 | for (k, v) in self.0.iter() { |
43 | 0 | stream.map_key_begin()?; |
44 | 0 | stream.value(k)?; |
45 | 0 | stream.map_key_end()?; |
46 | | |
47 | 0 | stream.map_value_begin()?; |
48 | 0 | stream.value(v)?; |
49 | 0 | stream.map_value_end()?; |
50 | | } |
51 | | |
52 | 0 | stream.map_end() |
53 | 0 | } |
54 | | } |
55 | | |
56 | | #[cfg(feature = "alloc")] |
57 | | mod alloc_support { |
58 | | use super::*; |
59 | | use crate::std::collections::BTreeMap; |
60 | | |
61 | | impl<K: Value, V: Value> Value for BTreeMap<K, V> { |
62 | 0 | fn stream<'sval, S: Stream<'sval> + ?Sized>(&'sval self, stream: &mut S) -> Result { |
63 | 0 | stream.map_begin(Some(self.len()))?; |
64 | | |
65 | 0 | for (k, v) in self { |
66 | 0 | stream.map_key_begin()?; |
67 | 0 | stream.value(k)?; |
68 | 0 | stream.map_key_end()?; |
69 | | |
70 | 0 | stream.map_value_begin()?; |
71 | 0 | stream.value(v)?; |
72 | 0 | stream.map_value_end()?; |
73 | | } |
74 | | |
75 | 0 | stream.map_end() |
76 | 0 | } |
77 | | } |
78 | | } |
79 | | |
80 | | #[cfg(feature = "std")] |
81 | | mod std_support { |
82 | | use super::*; |
83 | | use crate::std::{collections::HashMap, hash::BuildHasher}; |
84 | | |
85 | | impl<K: Value, V: Value, H: BuildHasher> Value for HashMap<K, V, H> { |
86 | 0 | fn stream<'sval, S: Stream<'sval> + ?Sized>(&'sval self, stream: &mut S) -> Result { |
87 | 0 | stream.map_begin(Some(self.len()))?; |
88 | | |
89 | 0 | for (k, v) in self { |
90 | 0 | stream.map_key_begin()?; |
91 | 0 | stream.value(k)?; |
92 | 0 | stream.map_key_end()?; |
93 | | |
94 | 0 | stream.map_value_begin()?; |
95 | 0 | stream.value(v)?; |
96 | 0 | stream.map_value_end()?; |
97 | | } |
98 | | |
99 | 0 | stream.map_end() |
100 | 0 | } |
101 | | } |
102 | | } |