strip-json-comments rust (untested, kept here so i can find it later)

strip-json-comments.rs

pub fn strip_json_comments(s: &str) -> String {
    let mut result = String::with_capacity(s.len());
    let mut iter = s.chars();

    while let Some(c) = iter.next() {
        if c == '"' {
            // It's a string, skip to end without touching any comments inside.
            result.push(c);
            while let Some(c) = iter.next() {
                result.push(c);
                // Skip escape sequence.
                if c == '\\' {
                    result.extend(iter.next());
                    continue;
                }
                if c == '"' {
                    break;
                }
            }
        } else if c == '/' {
            // A comment. Skip past it, and replace it's non-whitespace
            // characters with spaces. This preserves line/column numbering
            // in the case that serde complains about something.
            #[inline]
            fn as_whitespace(c: char) -> char {
                if c.is_whitespace() {
                    c
                } else {
                    ' '
                }
            }
            match iter.next() {
                Some('/') => {
                    result.push(' '); // first '/'
                    result.push(' '); // second '/'
                    while let Some(c) = iter.next() {
                        result.push(as_whitespace(c));
                        if c == '\n' {
                            break;
                        }
                    }
                }
                Some('*') => {
                    // Multiline comment. Don't allow nesting, since it's easier not
                    // to and e.g. JS doesn't anyway.
                    result.push(' '); // replace '/'
                    result.push(' '); // replace '*'
                    while let Some(c) = iter.next() {
                        result.push(as_whitespace(c));
                        if c == '*' {
                            let c2 = iter.next();
                            result.extend(c2.map(as_whitespace));
                            if let Some('/') = c2 {
                                result.push(' ');
                                break;
                            }
                        }
                    }
                }
                Some(c2) => {
                    // Regular charac
                    result.extend([c, c2].iter().copied());
                }
                None => {}
            }
        } else {
            result.push(c);
        }
    }
    result
}