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
use crate::{
Environment,
builtin::BiMathFunctionType,
eval::apply::eval_apply,
is_number_eq,
value::Value,
};
pub(crate) fn builtin(
args: &[Value],
func_type: BiMathFunctionType,
env: &Environment,
) -> Option<(Value, Environment)> {
if let [v1, v2] = &args[..] {
match (eval_apply(v1, env), eval_apply(v2, env)) {
(Some((Value::Number(n1), _)), Some((Value::Number(n2), _))) => Some((
Value::Number(match func_type {
BiMathFunctionType::Div => {
if is_number_eq(n2, 0.0) {
eprintln!(concat!(
"Error[ksl::builtin::Div]: ",
"Division by zero."
));
return None;
} else {
n1 / n2
}
}
BiMathFunctionType::Power => n1.powf(n2),
BiMathFunctionType::Sub => n1 - n2,
}),
Environment::new(),
)),
(Some((e1, _)), Some((e2, _))) => {
eprintln!(
concat!(
"Error[ksl::builtin::<{:?}>]: ",
"Only accepts 2 numbers, but {:?} was passed."
),
func_type,
(e1, e2)
);
None
}
_ => {
eprintln!(
concat!(
"Error[ksl::builtin::<{:?}>]: ",
"Cannot evaluate expression {:?}."
),
func_type,
(v1, v2)
);
None
}
}
} else {
eprintln!(
concat!(
"Error[ksl::builtin::<{:?}>]: ",
"Only accepts 2 arguments, but {} were passed."
),
func_type,
args.len()
);
None
}
}