mexprp 0.3.1

A math expression parsing and evaluation library
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

use std::f64;
use std::cmp::Ordering;

use crate::opers::Calculation;
use crate::errors::MathError;
use crate::num::Num;
use crate::answer::Answer;
use crate::context::Context;

impl Num for f64 {
	fn from_f64(t: f64, _ctx: &Context<Self>) -> Calculation<Self> {
		Ok(Answer::Single(t))
	}

	fn from_f64_complex((r, _i): (f64, f64), _ctx: &Context<Self>) -> Calculation<Self> {
		Ok(Answer::Single(r))
	}

	fn typename() -> String {
		String::from("f64")
	}

	/// Compares two floats. Errors if either is NaN. Infinity is greater than anything except equal
	/// to infinity. Negative infinity is less than anything except equal to negative infinity.
	fn tryord(&self, other: &Self, ctx: &Context<Self>) -> Result<Ordering, MathError> {
		if self.is_nan() || other.is_nan() {
			return Err(MathError::CmpError);
		} else if self.is_infinite() {
			if self.is_sign_positive() {
				if other.is_infinite() && other.is_sign_positive() {
					Ok(Ordering::Equal)
				} else {
					Ok(Ordering::Greater)
				}
			} else {
				if other.is_infinite() && other.is_sign_negative() {
					Ok(Ordering::Equal)
				} else {
					Ok(Ordering::Less)
				}
			}
		} else if other.is_infinite() {
			Ok(other.tryord(&self, ctx)?.reverse())
		} else {
			Ok(self.partial_cmp(other).unwrap())
		}
	}

	fn add(&self, other: &Self, _ctx: &Context<Self>) -> Calculation<Self> {
		Ok(Answer::Single(*self + *other))
	}

	fn sub(&self, other: &Self, _ctx: &Context<Self>) -> Calculation<Self> {
		Ok(Answer::Single(*self - *other))
	}

	fn mul(&self, other: &Self, _ctx: &Context<Self>) -> Calculation<Self> {
		Ok(Answer::Single(*self * *other))
	}

	fn div(&self, other: &Self, _ctx: &Context<Self>) -> Calculation<Self> {
		if *other == 0.0 {
			return Err(MathError::DivideByZero);
		}

		Ok(Answer::Single(*self / *other))
	}

	fn pow(&self, other: &Self, _ctx: &Context<Self>) -> Calculation<Self> {
		Ok(Answer::Single(self.powf(*other)))
	}

	fn sqrt(&self, ctx: &Context<Self>) -> Calculation<Self> {
		let sqrt = f64::sqrt(*self);

		Ok(if ctx.cfg.sqrt_both {
			Answer::Multiple(vec![sqrt, -sqrt])
		} else {
			Answer::Single(sqrt)
		})
	}

	fn abs(&self, _ctx: &Context<Self>) -> Calculation<Self> {
		Ok(Answer::Single(f64::abs(*self)))
	}

	fn sin(&self, _ctx: &Context<Self>) -> Calculation<Self> {
		Ok(Answer::Single(f64::sin(*self)))
	}

	fn cos(&self, _ctx: &Context<Self>) -> Calculation<Self> {
		Ok(Answer::Single(f64::cos(*self)))
	}

	fn tan(&self, _ctx: &Context<Self>) -> Calculation<Self> {
		Ok(Answer::Single(f64::tan(*self)))
	}

	fn asin(&self, _ctx: &Context<Self>) -> Calculation<Self> {
		Ok(Answer::Single(f64::asin(*self)))
	}

	fn acos(&self, _ctx: &Context<Self>) -> Calculation<Self> {
		Ok(Answer::Single(f64::acos(*self)))
	}

	fn atan(&self, _ctx: &Context<Self>) -> Calculation<Self> {
		Ok(Answer::Single(f64::atan(*self)))
	}

	fn atan2(&self, other: &Self, _ctx: &Context<Self>) -> Calculation<Self> {
		Ok(Answer::Single(f64::atan2(*self, *other)))
	}

	fn floor(&self, _ctx: &Context<Self>) -> Calculation<Self> {
		Ok(Answer::Single(f64::floor(*self)))
	}

	fn ceil(&self, _ctx: &Context<Self>) -> Calculation<Self> {
		Ok(Answer::Single(f64::ceil(*self)))
	}

	fn round(&self, _ctx: &Context<Self>) -> Calculation<Self> {
		Ok(Answer::Single(f64::round(*self)))
	}

	fn log(&self, other: &Self, _ctx: &Context<Self>) -> Calculation<Self> {
		Ok(Answer::Single(f64::log(*self, *other)))
	}
}