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use core::char;
use core::iter::{Filter, FusedIterator};
use core::str::Split;
#[stable(feature = "split_whitespace", since = "1.1.0")]
pub struct SplitWhitespace<'a> {
inner: Filter<Split<'a, fn(char) -> bool>, fn(&&str) -> bool>,
}
#[allow(missing_docs)]
pub trait UnicodeStr {
fn split_whitespace<'a>(&'a self) -> SplitWhitespace<'a>;
fn is_whitespace(&self) -> bool;
fn is_alphanumeric(&self) -> bool;
fn trim(&self) -> &str;
fn trim_left(&self) -> &str;
fn trim_right(&self) -> &str;
}
impl UnicodeStr for str {
#[inline]
fn split_whitespace(&self) -> SplitWhitespace {
fn is_not_empty(s: &&str) -> bool {
!s.is_empty()
}
let is_not_empty: fn(&&str) -> bool = is_not_empty;
fn is_whitespace(c: char) -> bool {
c.is_whitespace()
}
let is_whitespace: fn(char) -> bool = is_whitespace;
SplitWhitespace { inner: self.split(is_whitespace).filter(is_not_empty) }
}
#[inline]
fn is_whitespace(&self) -> bool {
self.chars().all(|c| c.is_whitespace())
}
#[inline]
fn is_alphanumeric(&self) -> bool {
self.chars().all(|c| c.is_alphanumeric())
}
#[inline]
fn trim(&self) -> &str {
self.trim_matches(|c: char| c.is_whitespace())
}
#[inline]
fn trim_left(&self) -> &str {
self.trim_left_matches(|c: char| c.is_whitespace())
}
#[inline]
fn trim_right(&self) -> &str {
self.trim_right_matches(|c: char| c.is_whitespace())
}
}
#[derive(Clone)]
pub struct Utf16Encoder<I> {
chars: I,
extra: u16,
}
impl<I> Utf16Encoder<I> {
pub fn new(chars: I) -> Utf16Encoder<I>
where I: Iterator<Item = char>
{
Utf16Encoder {
chars: chars,
extra: 0,
}
}
}
impl<I> Iterator for Utf16Encoder<I>
where I: Iterator<Item = char>
{
type Item = u16;
#[inline]
fn next(&mut self) -> Option<u16> {
if self.extra != 0 {
let tmp = self.extra;
self.extra = 0;
return Some(tmp);
}
let mut buf = [0; 2];
self.chars.next().map(|ch| {
let n = CharExt::encode_utf16(ch, &mut buf).len();
if n == 2 {
self.extra = buf[1];
}
buf[0]
})
}
#[inline]
fn size_hint(&self) -> (usize, Option<usize>) {
let (low, high) = self.chars.size_hint();
(low, high.and_then(|n| n.checked_mul(2)))
}
}
#[unstable(feature = "fused", issue = "35602")]
impl<I> FusedIterator for Utf16Encoder<I>
where I: FusedIterator<Item = char> {}
#[stable(feature = "split_whitespace", since = "1.1.0")]
impl<'a> Iterator for SplitWhitespace<'a> {
type Item = &'a str;
fn next(&mut self) -> Option<&'a str> {
self.inner.next()
}
}
#[stable(feature = "split_whitespace", since = "1.1.0")]
impl<'a> DoubleEndedIterator for SplitWhitespace<'a> {
fn next_back(&mut self) -> Option<&'a str> {
self.inner.next_back()
}
}
#[unstable(feature = "fused", issue = "35602")]
impl<'a> FusedIterator for SplitWhitespace<'a> {}