null-kane 3.0.0

currency crate with the option to add your own currency localization logic
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
139
140
141
142
143
144
145
146
147
148
149

use crate::{Currency, CurrencyLocale};
use std::ops::{Add, AddAssign};

impl<L, T> Add<T> for Currency<L>
where
    T: Into<Currency<L>>,
    L: CurrencyLocale,
{
    type Output = Self;

    fn add(self, rhs: T) -> Self::Output {
        let rhs = rhs.into();
        match (self.negative, rhs.negative) {
            (true, true) | (false, false) => {
                Self::new(self.negative, self.amount + rhs.amount, self.locale)
            }
            (true, false) | (false, true) => {
                let negative = self.amount.checked_sub(rhs.amount).is_none();
                let amount = if negative {
                    rhs.amount - self.amount
                } else {
                    self.amount - rhs.amount
                };
                Self::new(self.negative ^ negative, amount, self.locale)
            }
        }
    }
}

impl<L, T> AddAssign<T> for Currency<L>
where
    T: Into<Currency<L>>,
    L: CurrencyLocale,
{
    fn add_assign(&mut self, rhs: T) {
        let rhs = rhs.into();
        match (self.negative, rhs.negative) {
            (false, false) | (true, true) => self.amount += rhs.amount,
            (false, true) | (true, false) => {
                self.negative ^= self.amount.checked_sub(rhs.amount).is_none();
                if self.negative {
                    self.amount = rhs.amount - self.amount
                } else {
                    self.amount -= rhs.amount
                };
            }
        }
    }
}

#[cfg(test)]
mod test {
    use super::*;

    #[derive(Clone, Copy, Default, Debug, PartialEq)]
    enum CurrencyL {
        #[default]
        De,
    }

    impl CurrencyLocale for CurrencyL {
        fn separator(&self) -> char {
            ','
        }

        fn thousand_separator(&self) -> char {
            '.'
        }

        fn currency_symbol(&self) -> &'static str {
            "€"
        }
    }

    #[test]
    fn add_currencies() {
        let curr1 = Currency::new(false, 24_000_22, CurrencyL::De);
        let curr2 = Currency::new(false, 24_000_99, CurrencyL::De);

        let expected = curr1 + curr2;
        assert_eq!(expected, Currency::new(false, 48_001_21, CurrencyL::De));
    }

    #[test]
    fn add_f32_to_currency() {
        let curr1 = Currency::new(false, 24_000_22, CurrencyL::De);

        let expected = curr1 + 24_000.99_f32;
        assert_eq!(expected, Currency::new(false, 48_001_21, CurrencyL::De));
    }

    #[test]
    fn add_assign_usize() {
        let mut curr1 = Currency::new(false, 24_000_22, CurrencyL::De);
        curr1 += 1usize;

        assert_eq!(curr1, Currency::new(false, 24_000_23, CurrencyL::De));
    }

    #[test]
    fn add_assign_f32() {
        let mut curr1 = Currency::new(false, 24_000_22, CurrencyL::De);
        curr1 += 1.12f32;

        assert_eq!(curr1, Currency::new(false, 24_001_34, CurrencyL::De));
    }

    #[test]
    fn add_assign_negative_f32() {
        let mut curr1 = Currency::new(false, 24_000_22, CurrencyL::De);
        curr1 += -1.12f32;

        assert_eq!(curr1, Currency::new(false, 23_999_10, CurrencyL::De));
    }

    #[test]
    fn add_assign_f64() {
        let mut curr1 = Currency::new(false, 24_000_22, CurrencyL::De);
        curr1 += 1.12f64;

        assert_eq!(curr1, Currency::new(false, 24_001_34, CurrencyL::De));
    }

    #[test]
    fn add_assign_negative_f64() {
        let mut curr1 = Currency::new(false, 24_000_22, CurrencyL::De);
        curr1 += -1.12f64;

        assert_eq!(curr1, Currency::new(false, 23_999_10, CurrencyL::De));
    }

    #[test]
    fn add_assign_currency() {
        let mut curr1 = Currency::new(false, 24_000_22, CurrencyL::De);
        let curr2 = Currency::new(false, 24_000_99, CurrencyL::De);

        curr1 += curr2;
        assert_eq!(curr1, Currency::new(false, 48_001_21, CurrencyL::De));
    }

    #[test]
    fn add_assign_negative_currency() {
        let mut curr1 = Currency::new(false, 24_000_22, CurrencyL::De);
        let curr2 = Currency::new(true, 1_22, CurrencyL::De);

        curr1 += curr2;
        assert_eq!(curr1, Currency::new(false, 23_999_00, CurrencyL::De));
    }
}