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
|
use std::fmt;
#[derive(Clone, PartialEq, Eq)]
pub enum Val {
Atom(String),
List(Vec<Self>),
I64(i64),
String(String),
}
impl fmt::Debug for Val {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
match self {
Val::Atom(v) => write!(f, "{v}"),
Val::List(vs) => {
f.write_str("(")?;
for (i, v) in vs.iter().enumerate() {
if i != 0 {
f.write_str(" ")?;
}
v.fmt(f)?;
}
f.write_str(")")?;
Ok(())
}
Val::I64(v) => v.fmt(f),
Val::String(s) => s.fmt(f),
}
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn print_string() {
assert_eq!(
format!("{:?}", Val::String("Hello, World!".to_string())),
"\"Hello, World!\"".to_string()
);
}
#[test]
fn print_atom() {
assert_eq!(
format!("{:?}", Val::Atom("boo-guff".to_string())),
"boo-guff".to_string()
);
}
#[test]
fn print_i64() {
assert_eq!(
format!("{:?}", Val::I64(1234)),
"1234".to_string()
);
}
#[test]
fn print_list() {
assert_eq!(
format!("{:?}", Val::List(vec!(Val::Atom("a".to_string()), Val::Atom("b".to_string())))),
"(a b)".to_string()
);
}
}
|
