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static RUST_KEYWORDS: &'static [&'static str] = &[
    "as", "break", "crate", "else", "enum", "extern", "false", "fn", "for", "if", "impl", "in",
    "let", "loop", "match", "mod", "move", "mut", "pub", "ref", "return", "static", "self", "Self",
    "struct", "super", "true", "trait", "type", "unsafe", "use", "while", "continue", "box",
    "const", "where", "virtual", "proc", "alignof", "become", "offsetof", "priv", "pure", "sizeof",
    "typeof", "unsized", "yield", "do", "abstract", "final", "override", "macro",
];

pub fn is_rust_keyword(ident: &str) -> bool {
    RUST_KEYWORDS.contains(&ident)
}

fn hex_digit(value: u32) -> char {
    if value < 10 {
        (b'0' + value as u8) as char
    } else if value < 0x10 {
        (b'a' + value as u8 - 10) as char
    } else {
        unreachable!()
    }
}

pub fn quote_escape_str(s: &str) -> String {
    let mut buf = String::new();
    buf.push('"');
    buf.extend(s.chars().flat_map(|c| c.escape_default()));
    buf.push('"');
    buf
}

pub fn quote_escape_bytes(bytes: &[u8]) -> String {
    let mut buf = String::new();
    buf.push('b');
    buf.push('"');
    for &b in bytes {
        match b {
            b'\n' => buf.push_str(r"\n"),
            b'\r' => buf.push_str(r"\r"),
            b'\t' => buf.push_str(r"\t"),
            b'"' => buf.push_str("\\\""),
            b'\\' => buf.push_str(r"\\"),
            b'\x20'..=b'\x7e' => buf.push(b as char),
            _ => {
                buf.push_str(r"\x");
                buf.push(hex_digit((b as u32) >> 4));
                buf.push(hex_digit((b as u32) & 0x0f));
            }
        }
    }
    buf.push('"');
    buf
}

#[cfg(test)]
mod test {

    use super::*;

    #[test]
    fn test_quote_escape_bytes() {
        assert_eq!("b\"\"", quote_escape_bytes(b""));
        assert_eq!("b\"xyZW\"", quote_escape_bytes(b"xyZW"));
        assert_eq!("b\"aa\\\"bb\"", quote_escape_bytes(b"aa\"bb"));
        assert_eq!("b\"aa\\r\\n\\tbb\"", quote_escape_bytes(b"aa\r\n\tbb"));
        assert_eq!(
            "b\"\\x00\\x01\\x12\\xfe\\xff\"",
            quote_escape_bytes(b"\x00\x01\x12\xfe\xff")
        );
    }

}