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
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
use super::{Number, 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)]
pub struct Numeric {
/// The number value of this numeric.
pub value: Number,
/// The unit of this numeric.
pub unit: UnitSet,
}
impl fmt::Debug for Numeric {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "{:?}; {:?}", self.value, self.unit)
}
}
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`] or a [`f64`].
pub fn new<V: Into<Number>, U: Into<UnitSet>>(value: V, unit: U) -> Self {
Self {
value: value.into(),
unit: unit.into(),
}
}
/// Create a new numeric value with no unit.
pub fn scalar(value: impl Into<Number>) -> Self {
Self {
value: value.into(),
unit: UnitSet::scalar(),
}
}
/// Create a new numeric that is a percentage from a number where
/// 1 maps to 100%.
pub(crate) fn percentage(value: impl Into<Number>) -> Self {
Self::new(value.into() * 100, Unit::Percent)
}
/// 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 * &Number::from(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 * &Number::from(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)
}
}
/// 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<Self> {
Formatted {
value: self,
format,
}
}
}
impl PartialEq for Numeric {
fn eq(&self, other: &Self) -> bool {
self.partial_cmp(other) == Some(std::cmp::Ordering::Equal)
}
}
impl Eq for Numeric {}
impl PartialOrd for Numeric {
fn partial_cmp(&self, other: &Self) -> 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,
}
.simplify()
}
}
impl Numeric {
fn simplify(mut self) -> Self {
let scale = self.unit.simplify();
self.value = (f64::from(self.value) * scale).into();
self
}
}
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,
}
.simplify()
}
}
impl Display for Formatted<'_, Numeric> {
fn fmt(&self, out: &mut fmt::Formatter) -> fmt::Result {
let t = self.value.clone().simplify();
t.value.format(self.format).fmt(out)?;
if !t.value.is_finite() && t.unit.is_pos() {
out.write_str(" * 1")?;
}
t.unit.fmt(out)
}
}