bt_math 0.3.0

Basic math expression evaluator library. Support basic math operators (+,-,*,/,^), parenthesis, and functions such as log10, ln, log2, exp, sin, cos, tan, asin, acos, atan, abs, sqrt. Support PI and E (Euler's number) as constants. Support negative numbers/expressions. Pow(x,y) supported
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

use bt_math::evaluate_expression;

#[test]
fn test_basic_arithmetic(){
    assert_eq!(evaluate_expression("1 + 2 - 3 / 10 * 5").unwrap(), 1.5);
}

#[test]
fn test_evaluate_with_numbers_and_operators() {
    let expression = "(2 + 3) * 4";
    let expected_result = 20.0;
    assert_eq!(evaluate_expression(expression).unwrap(), expected_result);
}
#[test]
fn test_evaluate_with_nested_parentheses() {
    let expression = "((2 + 3) * 4)^-2";
    let expected_result = 0.0025;
    assert_eq!(evaluate_expression(expression).unwrap(), expected_result);
}

#[test]
fn test_evaluate_with_exp_function() {
    let expression = "exp(2.0)";
    let expected_result = 7.38905609893065; // Approximately 7.38906
    assert_eq!(evaluate_expression(expression).unwrap(), expected_result);
}
#[test]
fn test_evaluate_with_log10_function() {
    let expression = "log10(100)";
    let expected_result = f64::log10(f64::powi(10.0, 2)); // Exactly 2
    assert_eq!(evaluate_expression(expression).unwrap(), expected_result);
}
// Test cases for handling invalid expressions
#[test]
fn test_evaluate_with_invalid_expression() {
    let expression = "abc";
    assert!(evaluate_expression(expression).is_err());
}
#[test]
fn test_evaluate_with_missing_parentheses() {
    let expression = "(2 + 3";
    assert!(evaluate_expression(expression).is_err());
}
// Test cases for edge cases
#[test]
fn test_evaluate_div_zero() {
    let expression = "0 / 0";
    assert!(evaluate_expression(expression).unwrap().is_nan());
}
#[test]
fn test_evaluate_with_neg_one() {
    let expression = "-1*1*-(2*3)";
    let expected_result = 6.00;
    assert_eq!(evaluate_expression(expression).unwrap(), expected_result);
}
#[test]
fn test_evaluate_log2() {
    let expression = "2 + log2(8)";
    let expected_result = 5.0;
    assert_eq!(evaluate_expression(expression).unwrap(), expected_result);
}

#[test]
fn test_evaluate_pi() {
    let expression = "2 + PI";
    let expected_result = 5.141592653589793;
    assert_eq!(evaluate_expression(expression).unwrap(), expected_result);
}

#[test]
fn test_evaluate_e() {
    let expression = "2 * E";
    let expected_result = 5.43656365691809;
    assert_eq!(evaluate_expression(expression).unwrap(), expected_result);
}

#[test]
fn test_evaluate_abs() {
    let expression = "abs(-sin(45) * tan(45) * cos(45))";
    let expected_result = 0.7240368080645851;
    assert_eq!(evaluate_expression(expression).unwrap(), expected_result);
}

#[test]
fn test_evaluate_arcs() {
    let expression = "asin(-0.98803162)+acos(-0.98803162)+atan(-0.98803162)";
    let expected_result = 0.7914183067858805;
    assert_eq!(evaluate_expression(expression).unwrap(), expected_result);
}

#[test]
fn test_evaluate_invalid_funct() {
    let expression = "wxyz(-0.98803162)";
    let expected_result = -0.98803162;
    assert_eq!(evaluate_expression(expression).unwrap(), expected_result);    
}

#[test]
fn test_invalid_funct_param() {
    let expression = "atan(rrr) * acos(-0.988031))";
    assert!(evaluate_expression(expression).is_err());
}


#[test]
fn test_negative_nums_pow_replace() {
    let expression = "POW(-5.357, -3)";
    let expected_result = -0.006504816667752897;
    assert_eq!(evaluate_expression(expression).unwrap(), expected_result );
}

#[test]
fn test_negative_func_start() {
    let expression = "-Sin(3.2547) - pow(5.365, 3.753) * COS(-45)";
    let expected_result = -287.29639770747946;
    assert_eq!(evaluate_expression(expression).unwrap(), expected_result );
}

#[test]
fn test_negative_const() {
    let expression = "-e^2*-PI";
    let expected_result = -23.213404357363384;
    assert_eq!(evaluate_expression(expression).unwrap(), expected_result );
}

#[test]
fn test_double_minus_negative() {
    let expression = "-3--3";
    let expected_result = 0.00;
    assert_eq!(evaluate_expression(expression).unwrap(), expected_result );
}

#[test]
fn test_double_minus_negative_parenthesis() {
    let expression = "-(-3--2)";
    let expected_result = 1.00;
    assert_eq!(evaluate_expression(expression).unwrap(), expected_result );
}

#[test]
fn test_negative_functions() {
    let expression = "-sin(45)--cos(45)-tan(-30)";
    let expected_result = -6.730912732362665;
    assert_eq!(evaluate_expression(expression).unwrap(), expected_result );
}