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use std::num::ParseFloatError;
use std::str::FromStr;
use iced::{Radians, Rotation};
use super::Value;
#[derive(Debug, thiserror::Error, Clone, PartialEq)]
pub enum ParseRotationError {
#[error("float parsing error: {0}")]
ParseFloatError(ParseFloatError),
#[error("invalid prefix")]
InvalidPrefix,
#[error("cannot parse rotation from empty string")]
Empty,
}
impl From<ParseFloatError> for ParseRotationError {
fn from(value: ParseFloatError) -> Self {
Self::ParseFloatError(value)
}
}
impl Value for Rotation {
type Err = ParseRotationError;
fn from_str(s: &str) -> Result<Self, Self::Err> {
if s.is_empty() {
return Err(ParseRotationError::Empty);
}
if s.starts_with(|c: char| !c.is_ascii_digit()) {
let (prefix, value) = s.split_at(1);
match prefix.to_lowercase().as_str() {
"s" => Ok(Rotation::Solid(Radians(f32::from_str(value)?))),
"f" => Ok(Rotation::Floating(Radians(f32::from_str(value)?))),
_ => Err(ParseRotationError::InvalidPrefix),
}
} else {
Ok(Rotation::Floating(Radians(f32::from_str(s)?)))
}
}
fn to_string(&self) -> String {
match self {
Self::Floating(value) => format!("f{}", value),
Self::Solid(value) => format!("s{}", value),
}
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn can_parse_without_prefix() {
assert_eq!(
Rotation::from_str("10.5"),
Ok(Rotation::Floating(Radians(10.5)))
)
}
#[test]
fn can_parse_with_s_prefix() {
assert_eq!(
Rotation::from_str("s12.3"),
Ok(Rotation::Solid(Radians(12.3)))
)
}
#[test]
fn can_parse_with_f_prefix() {
assert_eq!(
Rotation::from_str("f16.9"),
Ok(Rotation::Floating(Radians(16.9)))
)
}
#[test]
fn can_parse_with_uppercase_prefix() {
assert_eq!(
Rotation::from_str("S9.4"),
Ok(Rotation::Solid(Radians(9.4)))
)
}
#[test]
fn cant_parse_invalid_prefix() {
assert_eq!(
Rotation::from_str("a6.0"),
Err(ParseRotationError::InvalidPrefix)
)
}
#[test]
fn cant_parse_invalid_float() {
assert_eq!(
Rotation::from_str("3.a"),
Err(ParseRotationError::ParseFloatError(
f32::from_str("3.a").expect_err("")
))
)
}
#[test]
fn cant_parse_empty_string() {
assert_eq!(Rotation::from_str(""), Err(ParseRotationError::Empty))
}
}
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