justjson 0.3.0

An efficient JSON Value crate that allows borrowing data.
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

#[cfg(feature = "alloc")]
use alloc::string::String;
use core::borrow::Borrow;
use core::hash::Hash;
use core::ops::Deref;

/// A string that can be either Owned or Borrowed.
///
/// This type is similar to the standard library's Cow, but the `Owned` variant
/// is only available when the `alloc` or `std` features are enabled.
#[derive(Debug, Clone)]
pub enum AnyStr<'a> {
    /// An owned String.
    #[cfg(feature = "alloc")]
    Owned(String),
    /// A borrowed string slice.
    Borrowed(&'a str),
}

impl<'a> AnyStr<'a> {
    /// Returns this string as a `str` reference.
    ///
    /// This function in general doesn't need to be called, as `AnyStr`
    /// implements `AsRef<str>`, `Borrow<str>`, and `Deref<Target = str>`. This
    /// allows it to act as if it were a `&str` in most situations.
    #[inline]
    #[must_use]
    pub fn as_str(&self) -> &str {
        match self {
            #[cfg(feature = "alloc")]
            Self::Owned(str) => str,
            Self::Borrowed(str) => str,
        }
    }
}

impl<'a> AsRef<str> for AnyStr<'a> {
    #[inline]
    fn as_ref(&self) -> &str {
        self.as_str()
    }
}

impl<'a> Borrow<str> for AnyStr<'a> {
    #[inline]
    fn borrow(&self) -> &str {
        self.as_ref()
    }
}

impl<'a> Eq for AnyStr<'a> {}

impl<'a, 'b> PartialEq<AnyStr<'b>> for AnyStr<'a> {
    #[inline]
    fn eq(&self, other: &AnyStr<'b>) -> bool {
        self.as_ref() == other.as_ref()
    }
}

impl<'a, 'b> PartialEq<&'b str> for AnyStr<'a> {
    #[inline]
    fn eq(&self, other: &&'b str) -> bool {
        self == *other
    }
}

impl<'a> PartialEq<str> for AnyStr<'a> {
    #[inline]
    fn eq(&self, other: &str) -> bool {
        self.as_ref() == other
    }
}

impl<'a, 'b> PartialOrd<AnyStr<'b>> for AnyStr<'a> {
    #[inline]
    fn partial_cmp(&self, other: &AnyStr<'b>) -> Option<core::cmp::Ordering> {
        self.partial_cmp(other.as_ref())
    }
}

impl<'a, 'b> PartialOrd<&'b str> for AnyStr<'a> {
    #[inline]
    fn partial_cmp(&self, other: &&'b str) -> Option<core::cmp::Ordering> {
        self.partial_cmp(*other)
    }
}
impl<'a> PartialOrd<str> for AnyStr<'a> {
    #[inline]
    fn partial_cmp(&self, other: &str) -> Option<core::cmp::Ordering> {
        self.as_ref().partial_cmp(other)
    }
}

impl<'a> Deref for AnyStr<'a> {
    type Target = str;

    #[inline]
    fn deref(&self) -> &Self::Target {
        self.as_ref()
    }
}

impl<'a> Hash for AnyStr<'a> {
    #[inline]
    fn hash<H: core::hash::Hasher>(&self, state: &mut H) {
        self.as_ref().hash(state);
    }
}

impl<'a> From<&'a str> for AnyStr<'a> {
    #[inline]
    fn from(value: &'a str) -> Self {
        Self::Borrowed(value)
    }
}

#[cfg(feature = "alloc")]
impl<'a> From<String> for AnyStr<'a> {
    #[inline]
    fn from(value: String) -> Self {
        Self::Owned(value)
    }
}

#[test]
#[cfg(feature = "std")]
fn hash() {
    let mut set = std::collections::HashSet::new();
    set.insert(AnyStr::from(String::from("hello")));
    assert!(set.contains(&AnyStr::from("hello")));
    assert!(set.contains("hello"));
}

#[test]
fn ord() {
    assert!(AnyStr::Borrowed("a") < "b");
    assert!(AnyStr::Borrowed("a") < AnyStr::Borrowed("b"));
}