148 lines
3.8 KiB
Rust
148 lines
3.8 KiB
Rust
use std::ops::{BitAnd, BitOr, BitXor};
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use crate::style::Attribute;
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/// a bitset for all possible attributes
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#[derive(Debug, Default, Clone, Copy, PartialEq, Eq)]
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pub struct Attributes(u32);
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impl From<Attribute> for Attributes {
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fn from(attribute: Attribute) -> Self {
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Self(attribute.bytes())
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}
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}
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impl From<&[Attribute]> for Attributes {
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fn from(arr: &[Attribute]) -> Self {
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let mut attributes = Attributes::default();
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for &attr in arr {
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attributes.set(attr);
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}
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attributes
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}
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}
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impl BitAnd<Attribute> for Attributes {
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type Output = Self;
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fn bitand(self, rhs: Attribute) -> Self {
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Self(self.0 & rhs.bytes())
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}
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}
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impl BitAnd for Attributes {
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type Output = Self;
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fn bitand(self, rhs: Self) -> Self {
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Self(self.0 & rhs.0)
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}
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}
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impl BitOr<Attribute> for Attributes {
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type Output = Self;
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fn bitor(self, rhs: Attribute) -> Self {
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Self(self.0 | rhs.bytes())
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}
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}
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impl BitOr for Attributes {
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type Output = Self;
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fn bitor(self, rhs: Self) -> Self {
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Self(self.0 | rhs.0)
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}
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}
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impl BitXor<Attribute> for Attributes {
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type Output = Self;
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fn bitxor(self, rhs: Attribute) -> Self {
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Self(self.0 ^ rhs.bytes())
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}
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}
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impl BitXor for Attributes {
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type Output = Self;
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fn bitxor(self, rhs: Self) -> Self {
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Self(self.0 ^ rhs.0)
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}
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}
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impl Attributes {
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/// Returns the empty bitset.
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#[inline(always)]
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pub const fn none() -> Self {
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Self(0)
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}
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/// Returns a copy of the bitset with the given attribute set.
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/// If it's already set, this returns the bitset unmodified.
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#[inline(always)]
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pub const fn with(self, attribute: Attribute) -> Self {
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Self(self.0 | attribute.bytes())
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}
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/// Returns a copy of the bitset with the given attribute unset.
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/// If it's not set, this returns the bitset unmodified.
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#[inline(always)]
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pub const fn without(self, attribute: Attribute) -> Self {
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Self(self.0 & !attribute.bytes())
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}
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/// Sets the attribute.
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/// If it's already set, this does nothing.
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#[inline(always)]
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pub fn set(&mut self, attribute: Attribute) {
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self.0 |= attribute.bytes();
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}
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/// Unsets the attribute.
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/// If it's not set, this changes nothing.
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#[inline(always)]
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pub fn unset(&mut self, attribute: Attribute) {
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self.0 &= !attribute.bytes();
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}
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/// Sets the attribute if it's unset, unset it
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/// if it is set.
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#[inline(always)]
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pub fn toggle(&mut self, attribute: Attribute) {
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self.0 ^= attribute.bytes();
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}
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/// Returns whether the attribute is set.
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#[inline(always)]
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pub const fn has(self, attribute: Attribute) -> bool {
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self.0 & attribute.bytes() != 0
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}
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/// Sets all the passed attributes. Removes none.
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#[inline(always)]
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pub fn extend(&mut self, attributes: Attributes) {
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self.0 |= attributes.0;
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}
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/// Returns whether there is no attribute set.
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#[inline(always)]
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pub const fn is_empty(self) -> bool {
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self.0 == 0
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}
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}
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#[cfg(test)]
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mod tests {
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use super::{Attribute, Attributes};
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#[test]
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fn test_attributes() {
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let mut attributes: Attributes = Attribute::Bold.into();
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assert!(attributes.has(Attribute::Bold));
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attributes.set(Attribute::Italic);
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assert!(attributes.has(Attribute::Italic));
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attributes.unset(Attribute::Italic);
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assert!(!attributes.has(Attribute::Italic));
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attributes.toggle(Attribute::Bold);
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assert!(attributes.is_empty());
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}
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#[test]
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fn test_attributes_const() {
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const ATTRIBUTES: Attributes = Attributes::none().with(Attribute::Bold).with(Attribute::Italic).without(Attribute::Bold);
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assert!(!ATTRIBUTES.has(Attribute::Bold));
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assert!(ATTRIBUTES.has(Attribute::Italic));
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}
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}
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