1 use std::fmt;
2 use std::fmt::Formatter;
3
4 pub(crate) use crate::util::is_continuation;
5
6 use super::wtf8;
7 use super::wtf8::CodePoints;
8
encode_wide_unchecked(string: &[u8]) -> impl '_ + Iterator<Item = u16>9 fn encode_wide_unchecked(string: &[u8]) -> impl '_ + Iterator<Item = u16> {
10 wtf8::encode_wide(string).map(|x| x.expect("invalid string"))
11 }
12
decode_code_point(string: &[u8]) -> u3213 pub(crate) fn decode_code_point(string: &[u8]) -> u32 {
14 let mut code_points = CodePoints::new(string.iter().copied());
15 let code_point = code_points
16 .next()
17 .expect("cannot parse code point from empty string")
18 .expect("invalid string");
19 assert_eq!(None, code_points.next(), "multiple code points found");
20 code_point
21 }
22
ends_with(string: &[u8], suffix: &[u8]) -> bool23 pub(crate) fn ends_with(string: &[u8], suffix: &[u8]) -> bool {
24 wtf8::ends_with(string, suffix).unwrap_or(false)
25 }
26
starts_with(string: &[u8], prefix: &[u8]) -> bool27 pub(crate) fn starts_with(string: &[u8], prefix: &[u8]) -> bool {
28 wtf8::starts_with(string, prefix).unwrap_or(false)
29 }
30
debug(string: &[u8], f: &mut Formatter<'_>) -> fmt::Result31 pub(crate) fn debug(string: &[u8], f: &mut Formatter<'_>) -> fmt::Result {
32 for wchar in encode_wide_unchecked(string) {
33 write!(f, "\\u{{{:X}}}", wchar)?;
34 }
35 Ok(())
36 }
37
38 #[cfg(feature = "uniquote")]
39 pub(crate) mod uniquote {
40 use uniquote::Formatter;
41 use uniquote::Result;
42
escape(string: &[u8], f: &mut Formatter<'_>) -> Result43 pub(crate) fn escape(string: &[u8], f: &mut Formatter<'_>) -> Result {
44 f.escape_utf16(super::encode_wide_unchecked(string))
45 }
46 }
47