crossterm/style/
attributes.rs

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::default();
18        for &attr in arr {
19            attributes.set(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}
crossterm/style/attributes.rs

crossterm/style/
attributes.rs
