1use std::ops::{BitAnd, BitOr, BitXor};
2
3use crate::style::Attribute;
4
5/// a bitset for all possible attributes
6#[derive(Debug, Default, Clone, Copy, PartialEq, Eq)]
7pub struct Attributes(u32);
8
9impl From<Attribute> for Attributes {
10 fn from(attribute: Attribute) -> Self {
11 Self(attribute.bytes())
12 }
13}
14
15impl From<&[Attribute]> for Attributes {
16 fn from(arr: &[Attribute]) -> Self {
17 let mut attributes: Attributes = Attributes::default();
18 for &attr: Attribute in arr {
19 attributes.set(attribute:attr);
20 }
21 attributes
22 }
23}
24
25impl BitAnd<Attribute> for Attributes {
26 type Output = Self;
27 fn bitand(self, rhs: Attribute) -> Self {
28 Self(self.0 & rhs.bytes())
29 }
30}
31impl BitAnd for Attributes {
32 type Output = Self;
33 fn bitand(self, rhs: Self) -> Self {
34 Self(self.0 & rhs.0)
35 }
36}
37
38impl BitOr<Attribute> for Attributes {
39 type Output = Self;
40 fn bitor(self, rhs: Attribute) -> Self {
41 Self(self.0 | rhs.bytes())
42 }
43}
44impl BitOr for Attributes {
45 type Output = Self;
46 fn bitor(self, rhs: Self) -> Self {
47 Self(self.0 | rhs.0)
48 }
49}
50
51impl BitXor<Attribute> for Attributes {
52 type Output = Self;
53 fn bitxor(self, rhs: Attribute) -> Self {
54 Self(self.0 ^ rhs.bytes())
55 }
56}
57impl BitXor for Attributes {
58 type Output = Self;
59 fn bitxor(self, rhs: Self) -> Self {
60 Self(self.0 ^ rhs.0)
61 }
62}
63
64impl Attributes {
65 /// Sets the attribute.
66 /// If it's already set, this does nothing.
67 #[inline(always)]
68 pub fn set(&mut self, attribute: Attribute) {
69 self.0 |= attribute.bytes();
70 }
71
72 /// Unsets the attribute.
73 /// If it's not set, this changes nothing.
74 #[inline(always)]
75 pub fn unset(&mut self, attribute: Attribute) {
76 self.0 &= !attribute.bytes();
77 }
78
79 /// Sets the attribute if it's unset, unset it
80 /// if it is set.
81 #[inline(always)]
82 pub fn toggle(&mut self, attribute: Attribute) {
83 self.0 ^= attribute.bytes();
84 }
85
86 /// Returns whether the attribute is set.
87 #[inline(always)]
88 pub const fn has(self, attribute: Attribute) -> bool {
89 self.0 & attribute.bytes() != 0
90 }
91
92 /// Sets all the passed attributes. Removes none.
93 #[inline(always)]
94 pub fn extend(&mut self, attributes: Attributes) {
95 self.0 |= attributes.0;
96 }
97
98 /// Returns whether there is no attribute set.
99 #[inline(always)]
100 pub const fn is_empty(self) -> bool {
101 self.0 == 0
102 }
103}
104
105#[cfg(test)]
106mod tests {
107 use super::{Attribute, Attributes};
108
109 #[test]
110 fn test_attributes() {
111 let mut attributes: Attributes = Attribute::Bold.into();
112 assert!(attributes.has(Attribute::Bold));
113 attributes.set(Attribute::Italic);
114 assert!(attributes.has(Attribute::Italic));
115 attributes.unset(Attribute::Italic);
116 assert!(!attributes.has(Attribute::Italic));
117 attributes.toggle(Attribute::Bold);
118 assert!(attributes.is_empty());
119 }
120}
121