maudit_rolldown_utils 0.1.0

Fork of Rolldown for the Maudit project until Rolldown is published on crates.io
Documentation 
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use std::fmt::{Debug, Display};

#[derive(Clone, PartialEq, Eq, Default, Hash, PartialOrd, Ord)]
pub struct BitSet {
  entries: Vec<u8>,
}

impl BitSet {
  pub fn new(max_bit_count: u32) -> Self {
    Self { entries: vec![0; ((max_bit_count + 7) / 8) as usize] }
  }

  pub fn has_bit(&self, bit: u32) -> bool {
    (self.entries[bit as usize / 8] & (1 << (bit & 7))) != 0
  }

  pub fn set_bit(&mut self, bit: u32) {
    self.entries[bit as usize / 8] |= 1 << (bit & 7);
  }

  pub fn is_empty(&self) -> bool {
    self.entries.iter().all(|&e| e == 0)
  }

  pub fn union(&mut self, other: &Self) {
    for (i, &e) in other.entries.iter().enumerate() {
      self.entries[i] |= e;
    }
  }
}

impl Display for BitSet {
  fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
    let bit_string =
      self.entries.iter().map(|e| format!("{e:08b}")).collect::<Vec<String>>().join("_");
    f.write_str(&bit_string)
  }
}

impl Debug for BitSet {
  fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
    let bit_string =
      self.entries.iter().map(|e| format!("{e:08b}")).collect::<Vec<String>>().join("_");
    f.debug_tuple("BitSet").field(&bit_string).finish()
  }
}

#[cfg(test)]
mod tests {
  use super::*;

  #[test]
  fn basic() {
    let mut bs = BitSet::new(1);
    assert_eq!(bs.to_string(), "00000000");
    bs.set_bit(0);
    bs.set_bit(1);
    bs.set_bit(7);
    assert_eq!(bs.to_string(), "10000011");

    let mut bs = BitSet::new(9);
    assert_eq!(bs.to_string(), "00000000_00000000");
    bs.set_bit(0);
    bs.set_bit(1);
    bs.set_bit(7);
    assert_eq!(bs.to_string(), "10000011_00000000");
    bs.set_bit(8);
    assert_eq!(bs.to_string(), "10000011_00000001");
    bs.set_bit(15);
    assert_eq!(bs.to_string(), "10000011_10000001");
  }

  #[test]
  fn union() {
    let mut bs = BitSet::new(9);
    assert_eq!(bs.to_string(), "00000000_00000000");
    let mut bs2 = bs.clone();
    bs.set_bit(0);
    bs.set_bit(1);
    bs.set_bit(7);
    assert_eq!(bs.to_string(), "10000011_00000000");
    bs2.set_bit(8);
    bs2.set_bit(15);
    assert_eq!(bs2.to_string(), "00000000_10000001");
    //
    bs.union(&bs2);
    assert_eq!(bs.to_string(), "10000011_10000001");
  }
}