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
|
use iced::Alignment;
use super::Value;
#[derive(Debug, thiserror::Error, Clone, PartialEq)]
pub enum ParseAlignmentError {
#[error("cannot parse rotation from empty string")]
Empty,
#[error("invalid variant")]
InvalidVariant,
}
impl Value for Alignment {
type Err = ParseAlignmentError;
fn from_str(s: &str) -> Result<Self, Self::Err> {
let s = s.trim();
if s.is_empty() {
return Err(ParseAlignmentError::Empty);
}
match s {
"start" => Ok(Self::Start),
"center" => Ok(Self::Center),
"end" => Ok(Self::End),
_ => Err(ParseAlignmentError::InvalidVariant),
}
}
fn to_string(&self) -> String {
match self {
Self::Start => String::from("start"),
Self::Center => String::from("center"),
Self::End => String::from("end"),
}
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn can_parse_with_spaces() {
assert_eq!(Alignment::from_str(" start"), Ok(Alignment::Start));
assert_eq!(Alignment::from_str(" center "), Ok(Alignment::Center));
assert_eq!(Alignment::from_str("end "), Ok(Alignment::End))
}
#[test]
fn cant_parse_invalid_variant() {
assert_eq!(
Alignment::from_str("middle"),
Err(ParseAlignmentError::InvalidVariant)
)
}
#[test]
fn cant_parse_empty_string() {
assert_eq!(Alignment::from_str(" "), Err(ParseAlignmentError::Empty))
}
}
|
