compare_variables 0.2.1

A Rust procedural macro for comparing the ordering of variables and creating useful error messages
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
150
151
152
153
154
155
156
157
158
159

use compare_variables::*;

/**
Check the macro hygiene
 */
#[test]
fn test_compare_variables_float() {
    let arg = 0.5;
    let res = compare_variables!(0.0 < arg as alternative_arg <= 1.0);
    assert!(res.is_ok());

    let arg = 2.0;
    let res = compare_variables!(arg != 2.0);
    assert!(res.is_err());

    let arg = 2.0;
    let res = compare_variables!(0.0 < arg as alternative_arg <= 1.0);
    assert!(res.is_err());

    let arg = 3.0;
    let res = compare_variables!(3.0 < arg);
    assert!(res.is_err());

    let arg = 2.0;
    let res = compare_variables!(-1.0 < arg);
    assert!(res.is_ok());

    let arg = 2.0;
    let res = compare_variables!(arg <= 2.0);
    assert!(res.is_ok());

    let arg = 2.0;
    let res = compare_variables!(arg < 2.0);
    assert!(res.is_err());
}

#[test]
fn test_compare_variables_i32() {
    let arg = 1;
    let res = compare_variables!(0 < arg as alternative_arg <= 2);
    assert!(res.is_ok());

    let res = compare_variables!(0 < arg as alternative_arg <= -2);
    assert!(res.is_err());

    let res = compare_variables!(0 >= -2);
    assert!(res.is_ok());
}

#[test]
fn test_compare_variables_usize() {
    let arg = 1usize;
    let res = compare_variables!(0 < arg as alternative_arg <= 2);
    assert!(res.is_ok());
}

#[test]
fn test_compare_variables_raw_value() {
    {
        let arg = 1usize;
        let err = compare_variables!(0 > val arg).unwrap_err();
        assert_eq!(err.to_string(), "`0 > 1` is false");
    }
    {
        let arg = 1usize;
        let err = compare_variables!(0 > val arg > 2).unwrap_err();
        assert_eq!(err.to_string(), "`0 > 1 > 2` is false");
    }
    {
        let arg = 1usize;
        let err = compare_variables!(0 > val arg as alternative_arg).unwrap_err();
        assert_eq!(err.to_string(), "`0 > 1` is false");
    }
    {
        let val = 1usize;
        let err = compare_variables!(0 > val val).unwrap_err();
        assert_eq!(err.to_string(), "`0 > 1` is false");
    }

    {
        let val = 1usize;
        let err = compare_variables!(0 > val);
        assert_eq!(
            format!("{}", err.unwrap_err()),
            "`0 > val (value: 1)` is false"
        );
    }
}

#[test]
fn check_arg_message() {
    let message = ComparisonError::new(
        ComparisonValue::new(1.0, None),
        ComparisonOperator::Equal,
        ComparisonValue::new(2.0, Some("argument")),
        ComparisonOperator::Equal,
        None,
    )
    .unwrap_err();
    assert_eq!(
        format!("{message}"),
        "`1.0 == argument (value: 2.0)` is false"
    );

    let message = ComparisonError::new(
        ComparisonValue::new(2.0, None),
        ComparisonOperator::Equal,
        ComparisonValue::new(2.0, Some("argument")),
        ComparisonOperator::Greater,
        Some(ComparisonValue::new(2.0, Some("argument"))),
    )
    .unwrap_err();
    assert_eq!(
        format!("{message}"),
        "`2.0 == argument (value: 2.0) > argument (value: 2.0)` is false"
    );

    let message = ComparisonError::new(
        ComparisonValue::new(2.0, None),
        ComparisonOperator::Equal,
        ComparisonValue::new(2.0, Some("argument")),
        ComparisonOperator::Greater,
        Some(ComparisonValue::new(2.0, None)),
    )
    .unwrap_err();
    assert_eq!(
        format!("{message}"),
        "`2.0 == argument (value: 2.0) > 2.0` is false"
    );

    let message = ComparisonError::new(
        ComparisonValue::new(2.0, None),
        ComparisonOperator::Lesser,
        ComparisonValue::new(2.0, None),
        ComparisonOperator::Greater,
        Some(ComparisonValue::new(2.0, None)),
    )
    .unwrap_err();
    assert_eq!(format!("{message}"), "`2.0 < 2.0 > 2.0` is false");

    let message = ComparisonError::new(
        ComparisonValue::new(0.0, None),
        ComparisonOperator::Lesser,
        ComparisonValue::new(2.0, None),
        ComparisonOperator::LesserOrEqual,
        Some(ComparisonValue::new(1.0, None)),
    )
    .unwrap_err();
    assert_eq!(format!("{message}"), "`0.0 < 2.0 <= 1.0` is false");

    let _ = ComparisonError::new(
        ComparisonValue::new(2.0, None),
        ComparisonOperator::LesserOrEqual,
        ComparisonValue::new(2.0, None),
        ComparisonOperator::GreaterOrEqual,
        Some(ComparisonValue::new(2.0, None)),
    )
    .is_ok();
}