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use std::ops::Rem;
use tailwind_ast::parse_fraction;
use super::*;
#[derive(Debug, Copy, Clone)]
pub enum LengthUnit {
Fraction(u32, u32),
Unit(f32, &'static str),
}
impl Display for LengthUnit {
fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
match self {
Self::Fraction(a, b) => write!(f, "{}/{}", a, b),
Self::Unit(a, b) => write!(f, "{}{}", *a as usize, b),
}
}
}
impl LengthUnit {
pub fn parse_faction(input: &str) -> Result<Self> {
let (a, b) = parse_fraction(input)?.1;
Ok(Self::radio(a as u32, b as u32))
}
pub fn parse_length(input: &str) -> Result<Self> {
let valid = (unit("px"), unit("em"), unit("rem"), unit("%"));
let (f, unit) = tuple((parse_f32, alt(valid)))(input)?.1;
Ok(Self::Unit(f, unit))
}
pub fn parse_angle(input: &str) -> Result<Self> {
let valid = (unit("deg"), unit("rad"), unit("grad"), unit("turn"));
let (f, unit) = tuple((parse_f32, alt(valid)))(input)?.1;
Ok(Self::Unit(f, unit))
}
pub fn px(x: f32) -> Self {
Self::Unit(x, "px")
}
pub fn em(x: f32) -> Self {
Self::Unit(x, "em")
}
pub fn rem(x: f32) -> Self {
Self::Unit(x, "rem")
}
pub fn percent(x: f32) -> Self {
Self::Unit(x, "%")
}
pub fn radio(a: u32, b: u32) -> Self {
if b.eq(&0) {
return Self::Fraction(0, 1);
}
let n = gcd(a, b);
Self::Fraction(a / n, b / n)
}
}
pub fn gcd<T>(a: T, b: T) -> T
where
T: PartialEq + Rem<Output = T> + Default + Copy,
{
if b == T::default() { a } else { gcd(b, a % b) }
}
fn unit(unit: &'static str) -> impl Fn(&str) -> IResult<&str, &'static str> {
move |input: &str| tag(unit)(input).map(|(s, _)| (s, unit))
}
impl LengthUnit {
#[inline]
pub fn get_class(&self) -> String {
self.to_string()
}
#[inline]
pub fn get_class_arbitrary(&self) -> String {
format!("[{}]", self)
}
#[inline]
pub fn get_properties(&self) -> String {
match self {
Self::Fraction(a, b) => {
let p = *a as f32 / *b as f32;
format!("{}%", 100.0 * p)
},
Self::Unit(a, b) => format!("{}{}", a, b),
}
}
pub fn is_fraction(&self) -> bool {
matches!(self, Self::Fraction { .. })
}
pub fn is_fraction_eq(&self) -> bool {
match self {
Self::Fraction(a, b) => a.eq(b),
_ => false,
}
}
pub fn is_fraction_zero(&self) -> bool {
match self {
Self::Fraction(a, _) => a.eq(&0),
_ => false,
}
}
}
