}
}
-/// As char_len but for a slice of a string
-///
-/// # Arguments
-///
-/// * s - A valid string
-/// * start - The position inside `s` where to start counting in bytes
-/// * end - The position where to stop counting
-///
-/// # Return value
-///
-/// The number of Unicode characters in `s` between the given indices.
-pub fn count_chars(s: &str, start: uint, end: uint) -> uint {
- assert!(s.is_char_boundary(start));
- assert!(s.is_char_boundary(end));
- let mut i = start;
- let mut len = 0u;
- while i < end {
- let next = s.char_range_at(i).next;
- len += 1u;
- i = next;
- }
- return len;
-}
-
-/// Counts the number of bytes taken by the first `n` chars in `s`
-/// starting from `start`.
-pub fn count_bytes<'b>(s: &'b str, start: uint, n: uint) -> uint {
- assert!(s.is_char_boundary(start));
- let mut end = start;
- let mut cnt = n;
- let l = s.len();
- while cnt > 0u {
- assert!(end < l);
- let next = s.char_range_at(end).next;
- cnt -= 1u;
- end = next;
- }
- end - start
-}
-
// https://tools.ietf.org/html/rfc3629
static UTF8_CHAR_WIDTH: [u8, ..256] = [
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,