u_str.rs.html -- source (original) (raw)

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use core::char; use core::iter::{Filter, FusedIterator}; use core::str::Split;

#[stable(feature = "split_whitespace", since = "1.1.0")] #[derive(Clone, Debug)] pub struct SplitWhitespace<'a> { inner: Filter<Split<'a, IsWhitespace>, IsNotEmpty>, }

#[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 { SplitWhitespace { inner: self.split(IsWhitespace).filter(IsNotEmpty) } }

#[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)] #[allow(missing_debug_implementations)] pub struct Utf16Encoder { chars: I, extra: u16, }

impl Utf16Encoder {

pub fn new(chars: I) -> Utf16Encoder<I>
    where I: Iterator<Item = char>
{
    Utf16Encoder {
        chars,
        extra: 0,
    }
}

}

impl Iterator for Utf16Encoder 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 FusedIterator for Utf16Encoder where I: FusedIterator<Item = char> {}

#[derive(Clone)] struct IsWhitespace;

impl FnOnce<(char, )> for IsWhitespace { type Output = bool;

#[inline]
extern "rust-call" fn call_once(mut self, arg: (char, )) -> bool {
    self.call_mut(arg)
}

}

impl FnMut<(char, )> for IsWhitespace { #[inline] extern "rust-call" fn call_mut(&mut self, arg: (char, )) -> bool { arg.0.is_whitespace() } }

#[derive(Clone)] struct IsNotEmpty;

impl<'a, 'b> FnOnce<(&'a &'b str, )> for IsNotEmpty { type Output = bool;

#[inline]
extern "rust-call" fn call_once(mut self, arg: (&&str, )) -> bool {
    self.call_mut(arg)
}

}

impl<'a, 'b> FnMut<(&'a &'b str, )> for IsNotEmpty { #[inline] extern "rust-call" fn call_mut(&mut self, arg: (&&str, )) -> bool { !arg.0.is_empty() } }

#[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> {}