pub(crate) fn is_char_ascii_whitespace(c: char) -> bool {
c == '\u{09}' || c == '\u{0A}' || c == '\u{0C}' || c == '\u{0D}' || c == '\u{20}'
}
pub(crate) fn strip_leading_and_trailing_ascii_whitespace(string: &str) -> &str {
string.trim_matches(is_char_ascii_whitespace)
}
pub(crate) fn collect_a_sequence_of_non_ascii_white_space_code_points(
string: &str,
) -> (&str, &str) {
match string.find(is_char_ascii_whitespace) {
Some(i) => string.split_at(i),
None => (string, ""),
}
}
pub(crate) struct SplitAsciiWhitespace<'a>(&'a str);
impl<'a> Iterator for SplitAsciiWhitespace<'a> {
type Item = &'a str;
fn next(&mut self) -> Option<Self::Item> {
self.0 = self.0.trim_start_matches(is_char_ascii_whitespace);
let mut s = self.0.splitn(2, is_char_ascii_whitespace);
let next = s.next().unwrap_or("");
self.0 = s.next().unwrap_or("");
match (next.is_empty(), self.0.is_empty()) {
(true, true) => None,
(false, _) => Some(next),
_ => self.next(),
}
}
}
pub(crate) fn split_ascii_whitespace(string: &'_ str) -> SplitAsciiWhitespace<'_> {
SplitAsciiWhitespace(string)
}
pub(crate) struct SplitCommas<'a>(&'a str);
impl<'a> Iterator for SplitCommas<'a> {
type Item = &'a str;
fn next(&mut self) -> Option<Self::Item> {
let mut s = self.0.splitn(2, ',');
let next = s.next().unwrap_or("");
self.0 = s.next().unwrap_or("");
match (next.is_empty(), self.0.is_empty()) {
(true, true) => None,
(true, false) => Some(""),
(false, _) => Some(next),
}
}
}
pub(crate) fn split_commas(string: &'_ str) -> SplitCommas<'_> {
SplitCommas(string)
}
pub(crate) fn ascii_case_insensitive_match(a: &str, b: &str) -> bool {
a.to_ascii_lowercase() == b.to_ascii_lowercase()
}