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#[cfg_attr(not(feature = "num-traits"), no_std)]
#[cfg(feature = "num-traits")]
extern crate num;
#[cfg(test)]
mod test;
pub struct Kolakoski
{
run: usize,
run_length: u8,
is_one: bool,
}
#[cfg(feature = "num-traits")]
pub struct KolakoskiNum<N>
{
run: usize,
run_length: N,
is_one: bool,
}
impl Kolakoski
{
pub fn new() -> Kolakoski
{
Kolakoski
{
run: 0,
run_length: 1,
is_one: true,
}
}
}
#[cfg(feature = "num-traits")]
impl<N: Num> KolakoskiNum<N>
{
pub fn new() -> KolakoskiNum<N>
{
KolakoskiNum
{
run: 0,
run_length: N::one(),
is_one: true,
}
}
}
impl Iterator for Kolakoski
{
type Item = u8;
fn next(&mut self) -> Option<Self::Item>
{
if self.run_length == 0
{
self.is_one = !self.is_one;
self.run += 1;
if self.run == 1
{
self.run_length = 2;
}
else
{
self.run_length = Kolakoski::new().nth(self.run).unwrap();
}
}
self.run_length -= 1;
if self.is_one
{
Some(1)
}
else
{
Some(2)
}
}
}
#[cfg(feature = "num-traits")]
use num::traits::Num;
#[cfg(feature = "num-traits")]
impl<N: Num + Clone> Iterator for KolakoskiNum<N>
{
type Item = N;
fn next(&mut self) -> Option<Self::Item>
{
if self.run_length == N::zero()
{
self.is_one = !self.is_one;
self.run += 1;
if self.run == 1
{
self.run_length = N::one() + N::one()
}
else
{
self.run_length = KolakoskiNum::<N>::new().nth(self.run).unwrap();
}
}
self.run_length = self.run_length.clone() - N::one();
if self.is_one
{
Some(N::one())
}
else
{
Some(N::one() + N::one())
}
}
}