Function to_ascii

crates/common/src/str.rs:433–451

Convert a string to ascii compatible, escaping unicode-s into escape sequences.

(value: &Wtf8)

/// Convert a string to ascii compatible, escaping unicode-s into escape
/// sequences.
pub fn to_ascii(value: &Wtf8) -> AsciiString {
    let mut ascii = Vec::new();
    for cp in value.code_points() {
        if cp.is_ascii() {
            ascii.push(cp.to_u32() as u8);
        } else {
            let c = cp.to_u32();
            let hex = if c < 0x100 {
                format!("\\x{c:02x}")
            } else if c < 0x10000 {
                format!("\\u{c:04x}")
            } else {
                format!("\\U{c:08x}")
            };
            ascii.append(&mut hex.into_bytes());
        }
    }
    unsafe { AsciiString::from_ascii_unchecked(ascii) }
}

#[derive(Clone, Copy)]
pub struct UnicodeEscapeCodepoint(pub CodePoint);