EscapeUnicodeState::Done => None,
}
}
+
+ fn size_hint(&self) -> (usize, Option<usize>) {
+ let mut n = 0;
+ while (self.c as usize) >> (4 * (n + 1)) != 0 {
+ n += 1;
+ }
+ let n = match self.state {
+ EscapeUnicodeState::Backslash => n + 5,
+ EscapeUnicodeState::Type => n + 4,
+ EscapeUnicodeState::LeftBrace => n + 3,
+ EscapeUnicodeState::Value(offset) => offset + 2,
+ EscapeUnicodeState::RightBrace => 1,
+ EscapeUnicodeState::Done => 0,
+ };
+ (n, Some(n))
+ }
}
/// An iterator over the characters that represent a `char`, escaped
Some(c)
}
EscapeDefaultState::Done => None,
- EscapeDefaultState::Unicode(ref mut iter) => iter.next()
+ EscapeDefaultState::Unicode(ref mut iter) => iter.next(),
}
}
match self.state {
EscapeDefaultState::Char(_) => (1, Some(1)),
EscapeDefaultState::Backslash(_) => (2, Some(2)),
- EscapeDefaultState::Unicode(_) => (0, Some(10)),
- _ => (0, Some(0))
+ EscapeDefaultState::Unicode(ref iter) => iter.size_hint(),
+ EscapeDefaultState::Done => (0, Some(0)),
}
}
}
for (i, c) in self.char_indices() {
let esc = c.escape_default();
// If char needs escaping, flush backlog so far and write, else skip
- if esc.size_hint().0 != 1 {
+ if esc.size_hint() != (1, Some(1)) {
try!(f.write_str(&self[from..i]));
for c in esc {
try!(f.write_char(c));