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use super::{BadNumber, Number, Rational, Unit, UnitSet};
use crate::output::{Format, Formatted};
use std::fmt::{self, Display};
use std::ops::{Div, Mul, Neg};
/// A Numeric value is a [`Number`] with a [`Unit`] (which may be
/// Unit::None).
#[derive(Clone, Debug, Eq)]
pub struct Numeric {
/// The number value of this numeric.
pub value: Number,
/// The unit of this numeric.
pub unit: UnitSet,
}
impl Numeric {
/// Create a new numeric value.
///
/// The value can be given as anything that can be converted into
/// a [`Number`], e.g. an [`isize`], a [`Rational`], or a [`f64`].
pub fn new<V: Into<Number>, U: Into<UnitSet>>(value: V, unit: U) -> Self {
Numeric {
value: value.into(),
unit: unit.into(),
}
}
/// Create a new numeric value with no unit.
pub fn scalar(value: impl Into<Number>) -> Numeric {
Numeric {
value: value.into(),
unit: UnitSet::scalar(),
}
}
/// Convert this numeric value to a given unit, if possible.
///
/// # Examples
/// ```
/// # use rsass::value::{Numeric, Unit};
/// let inch = Numeric::new(1, Unit::In);
/// assert_eq!(inch.as_unit(Unit::Mm).unwrap() * 5, 127.into());
/// assert_eq!(inch.as_unit(Unit::Deg), None);
/// ```
pub fn as_unit(&self, unit: Unit) -> Option<Number> {
self.unit
.scale_to_unit(&unit)
.map(|scale| &self.value * &scale)
}
/// Convert this numeric value to a given unit, if possible.
///
/// # Examples
/// ```
/// # use rsass::value::{Numeric, Unit};
/// let inch = Numeric::new(1, Unit::In);
/// assert_eq!(inch.as_unit(Unit::Mm).unwrap() * 5, 127.into());
/// assert_eq!(inch.as_unit(Unit::Deg), None);
/// ```
pub fn as_unitset(&self, unit: &UnitSet) -> Option<Number> {
self.unit.scale_to(unit).map(|scale| &self.value * &scale)
}
/// Convert this numeric value to a given unit, if possible.
///
/// Like [as_unit](Self::as_unit), except a unitless numeric is
/// considered to be the expected unit.
pub fn as_unit_def(&self, unit: Unit) -> Option<Number> {
if self.is_no_unit() {
Some(self.value.clone())
} else {
self.as_unit(unit)
}
}
/// Get this number as a rational number.
///
/// The unit is ignored. If the value is bignum rational or
/// floating point, it is approximated as long as it is withing
/// range, otherwises an error is returned.
pub fn as_ratio(&self) -> Result<Rational, BadNumber> {
self.value.as_ratio()
}
/// Return true if this value has no unit.
pub fn is_no_unit(&self) -> bool {
self.unit.is_none()
}
/// Get a reference to this `Value` bound to an output format.
pub fn format(&self, format: Format) -> Formatted<Numeric> {
Formatted {
value: self,
format,
}
}
}
impl PartialEq for Numeric {
fn eq(&self, other: &Numeric) -> bool {
self.partial_cmp(other) == Some(std::cmp::Ordering::Equal)
}
}
impl PartialOrd for Numeric {
fn partial_cmp(&self, other: &Numeric) -> Option<std::cmp::Ordering> {
if self.unit == other.unit {
self.value.partial_cmp(&other.value)
} else if self.is_no_unit() || other.is_no_unit() {
match self.value.partial_cmp(&other.value) {
Some(std::cmp::Ordering::Equal) => None,
other => other,
}
} else if let Some(scaled) = other.as_unitset(&self.unit) {
self.value.partial_cmp(&scaled)
} else {
None
}
}
}
impl Neg for &Numeric {
type Output = Numeric;
fn neg(self) -> Self::Output {
Numeric {
value: -&self.value,
unit: self.unit.clone(),
}
}
}
impl Div for &Numeric {
type Output = Numeric;
fn div(self, rhs: Self) -> Self::Output {
Numeric {
value: &self.value / &rhs.value,
unit: &self.unit / &rhs.unit,
}
}
}
impl Mul for &Numeric {
type Output = Numeric;
fn mul(self, rhs: Self) -> Self::Output {
Numeric {
value: &self.value * &rhs.value,
unit: &self.unit * &rhs.unit,
}
}
}
impl<'a> Display for Formatted<'a, Numeric> {
fn fmt(&self, out: &mut fmt::Formatter) -> fmt::Result {
let mut unit = self.value.unit.clone();
let value = &self.value.value * &unit.simplify();
value.format(self.format).fmt(out)?;
unit.fmt(out)
}
}