bde 0.3.0

B-Decoder/Encoder
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

use serde::Serialize;
use std::fmt::{Debug, Display};

#[derive(PartialEq, Eq, PartialOrd, Ord)]
pub struct Integer {
    inner: IntegerType,
}

impl Debug for Integer {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        write!(f, "Integer({})", self)
    }
}

impl Display for Integer {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        match self.inner {
            IntegerType::Negative(n) => f.write_str(itoa::Buffer::new().format(n)),
            IntegerType::Positive(n) => f.write_str(itoa::Buffer::new().format(n)),
        }
    }
}

#[derive(PartialEq, Eq, PartialOrd, Ord)]
enum IntegerType {
    Negative(i64),
    Positive(u64),
}

impl From<i64> for Integer {
    fn from(value: i64) -> Self {
        Self {
            inner: IntegerType::Negative(value),
        }
    }
}

impl From<u64> for Integer {
    fn from(value: u64) -> Self {
        Self {
            inner: IntegerType::Positive(value),
        }
    }
}

impl Integer {
    pub const fn is_i64(&self) -> bool {
        match self.inner {
            IntegerType::Positive(n) => n <= i64::max_value() as u64,
            IntegerType::Negative(_) => true,
        }
    }

    pub const fn is_u64(&self) -> bool {
        matches!(self.inner, IntegerType::Positive(_))
    }

    pub const fn as_i64(&self) -> Option<i64> {
        match self.inner {
            IntegerType::Negative(n) => Some(n),
            IntegerType::Positive(n) => {
                if n <= i64::MAX as u64 {
                    Some(n as i64)
                } else {
                    None
                }
            }
        }
    }

    pub const fn as_u64(&self) -> Option<u64> {
        match self.inner {
            IntegerType::Positive(n) => Some(n),
            IntegerType::Negative(_) => None,
        }
    }
}

impl Serialize for Integer {
    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
    where
        S: serde::Serializer,
    {
        match self.inner {
            IntegerType::Negative(integer) => serializer.serialize_i64(integer),
            IntegerType::Positive(integer) => serializer.serialize_u64(integer),
        }
    }
}