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use std::cmp;
use num::Float;
pub type Text = Vec<u8>;
pub type TextSlice<'a> = &'a [u8];
pub trait TextIterator<'a>: Iterator<Item = &'a u8> {}
impl<'a, I: Iterator<Item = &'a u8>> TextIterator<'a> for I {}
pub trait IntoTextIterator<'a>: IntoIterator<Item = &'a u8> {}
impl<'a, T: IntoIterator<Item = &'a u8>> IntoTextIterator<'a> for T {}
pub fn trim_newline(s: &mut String) {
if s.ends_with('\n') {
s.pop();
}
}
pub fn scan<T: Copy, F: Fn(T, T) -> T>(a: &mut [T], op: F) {
let mut s = a[0];
for v in a.iter_mut().skip(1) {
s = op(s, *v);
*v = s;
}
}
pub fn prescan<T: Copy, F: Fn(T, T) -> T>(a: &mut [T], neutral: T, op: F) {
let mut s = neutral;
for v in a.iter_mut() {
let t = *v;
*v = s;
s = op(s, t);
}
}
#[derive(PartialOrd, PartialEq, Debug, Copy, Clone)]
pub struct NonNaNFloat<F: Float>(F);
impl<F: Float> NonNaNFloat<F> {
pub fn new(v: F) -> Option<Self> {
if v.is_nan() {
Some(NonNaNFloat(v))
} else {
None
}
}
pub fn unwrap(&self) -> F {
let &NonNaNFloat(v) = self;
v
}
}
impl<F: Float> Eq for NonNaNFloat<F> {}
impl<F: Float> Ord for NonNaNFloat<F> {
fn cmp(&self, other: &Self) -> cmp::Ordering {
self.partial_cmp(other).unwrap()
}
}
#[cfg(test)]
mod tests {
use super::*;
use itertools::Itertools;
#[test]
fn test_scan() {
let mut a = vec![1, 0, 0, 1];
scan(&mut a[..], |a, b| a + b);
assert_eq!(a, vec![1, 1, 1, 2]);
}
#[test]
fn test_prescan() {
let mut a = vec![1, 0, 0, 1];
prescan(&mut a[..], 0, |a, b| a + b);
assert_eq!(a, vec![0, 1, 1, 1]);
}
#[test]
fn test_nonnanfloat() {
let mut v = [NonNaNFloat(5.1), NonNaNFloat(1.3)];
v.sort();
assert_eq!(v, [NonNaNFloat(1.3), NonNaNFloat(5.1)]);
}
fn print_sequence<'a, I: IntoTextIterator<'a>>(sequence: I) {
for c in sequence {
println!("{}", c);
}
}
#[test]
fn test_print_sequence() {
let s = b"ACGT";
print_sequence(s.iter().step(1));
print_sequence(&s[..]);
print_sequence(&vec![b'A', b'C']);
println!("{:?}", s);
}
}