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use std::num::ParseFloatError;
use std::str::FromStr;
use iced::Length;
use iced::widget::grid::Sizing;
use super::Value;
use super::length::ParseLengthError;
#[derive(Debug, thiserror::Error, Clone, PartialEq)]
pub enum ParseSizingError {
#[error("float parsing error: {0}")]
ParseFloatError(ParseFloatError),
#[error("length parsing error: {0}")]
ParseLengthError(#[from] ParseLengthError),
#[error("invalid prefix")]
InvalidPrefix,
#[error("missing prefix")]
MissingPrefix,
#[error("cannot parse sizing from empty string")]
Empty,
}
impl From<ParseFloatError> for ParseSizingError {
fn from(value: ParseFloatError) -> Self {
Self::ParseFloatError(value)
}
}
impl Value for Sizing {
type Err = ParseSizingError;
fn from_str(s: &str) -> Result<Self, Self::Err> {
let s = s.trim();
if s.is_empty() {
return Err(ParseSizingError::Empty);
}
if s.starts_with(|c: char| c.is_ascii_digit()) {
return Err(ParseSizingError::MissingPrefix);
}
let (prefix, value) = s.split_at(2);
match prefix.to_lowercase().as_str() {
"ar" => Ok(Self::AspectRatio(f32::from_str(value)?)),
"ed" => Ok(Self::EvenlyDistribute(Length::from_str(value)?)),
_ => Err(ParseSizingError::InvalidPrefix),
}
}
fn to_string(&self) -> String {
match self {
Self::AspectRatio(ratio) => format!("ar{ratio}"),
Self::EvenlyDistribute(length) => {
format!("ed{}", length.to_string())
}
}
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn can_parse_ratio() {
assert_eq!(Sizing::from_str("ar5.1"), Ok(Sizing::AspectRatio(5.1)))
}
#[test]
fn can_parse_distribute_with_space() {
assert_eq!(
Sizing::from_str(" edfp2 "),
Ok(Sizing::EvenlyDistribute(Length::FillPortion(2)))
)
}
#[test]
fn cant_parse_invalid_prefix() {
assert_eq!(
Sizing::from_str("bc4.1 "),
Err(ParseSizingError::InvalidPrefix)
)
}
#[test]
fn cant_parse_invalid_float() {
assert_eq!(
Sizing::from_str(" ar2.a"),
Err(ParseSizingError::ParseFloatError(
f32::from_str("2.a").expect_err("float parse should fail")
))
)
}
#[test]
fn cant_parse_with_missing_prefix() {
assert_eq!(
Sizing::from_str("2.4"),
Err(ParseSizingError::MissingPrefix)
)
}
#[test]
fn cant_parse_empty_string() {
assert_eq!(Sizing::from_str(" "), Err(ParseSizingError::Empty))
}
}
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