ada-idna 0.1.0

Fast IDNA (Internationalized Domain Names in Applications) implementation in Rust
Documentation 
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pub fn valid_name_code_point(cp: u32) -> bool {
    matches!(
        cp,
        0x002D | 0x0030..=0x0039 | 0x0061..=0x007A
        | 0x00B7
        | 0x00C0..=0x00D6 | 0x00D8..=0x00F6 | 0x00F8..=0x037D
        | 0x037F..=0x1FFF
        | 0x200C | 0x200D
        | 0x203F | 0x2040
        | 0x2070..=0x218F
        | 0x2C00..=0x2FEF
        | 0x3001..=0xD7FF
        | 0xF900..=0xFDCF
        | 0xFDF0..=0xFFFD
        | 0x10000..=0xEFFFF
    )
}

pub fn valid_name_code_point_first_position(cp: u32) -> bool {
    // First position cannot be a digit or hyphen
    match cp {
        0x0030..=0x0039 => false, // digits
        0x002D => false,          // hyphen
        _ => is_letter(cp),
    }
}

pub fn valid_name_code_point_other_position(cp: u32) -> bool {
    // Other positions can be letters, digits, or hyphen (but not special chars)
    match cp {
        0x0030..=0x0039 => true, // digits
        0x002D => true,          // hyphen
        _ => is_letter(cp),
    }
}

fn is_letter(cp: u32) -> bool {
    matches!(
        cp,
        0x0041..=0x005A | 0x0061..=0x007A // A-Z, a-z
        | 0x00C0..=0x00D6 | 0x00D8..=0x00F6 | 0x00F8..=0x00FF // Latin-1 Supplement letters
        | 0x0100..=0x017F // Latin Extended-A
        | 0x0180..=0x024F // Latin Extended-B
        | 0x0370..=0x03FF // Greek and Coptic
        | 0x0400..=0x04FF // Cyrillic
        | 0x0590..=0x05FF // Hebrew
        | 0x0600..=0x06FF // Arabic
        | 0x4E00..=0x9FFF // CJK Unified Ideographs
        | 0x3040..=0x309F // Hiragana
        | 0x30A0..=0x30FF // Katakana
        | 0xAC00..=0xD7AF // Hangul Syllables
        | 0x0E00..=0x0E7F // Thai
    )
}

pub fn contains_forbidden_domain_code_point(input: &str) -> bool {
    for c in input.chars() {
        let cp = c as u32;
        match cp {
            0x0000..=0x001F | 0x007F..=0x009F => return true,
            0x0020 | 0x0022 | 0x0023 | 0x0025 | 0x002F => return true,
            0x003A | 0x003C | 0x003E | 0x003F | 0x0040 => return true,
            0x005B | 0x005C | 0x005D | 0x005E | 0x007C => return true,
            _ => continue,
        }
    }
    false
}

pub fn is_ascii(input: &str) -> bool {
    input.is_ascii()
}

pub fn is_label_valid(label: &str) -> bool {
    if label.is_empty() || label.len() > 63 {
        return false;
    }

    if label.starts_with('-') || label.ends_with('-') {
        return false;
    }

    if let Some(stripped) = label.strip_prefix("xn--") {
        return crate::punycode::verify_punycode(stripped);
    }

    for c in label.chars() {
        if !valid_name_code_point(c as u32) {
            return false;
        }
    }

    true
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_valid_name_code_point() {
        assert!(valid_name_code_point(b'a' as u32));
        assert!(valid_name_code_point(b'0' as u32));
        assert!(valid_name_code_point(b'-' as u32));
        assert!(!valid_name_code_point(b' ' as u32));
    }

    #[test]
    fn test_is_ascii() {
        assert!(is_ascii("hello"));
        assert!(!is_ascii("café"));
    }

    #[test]
    fn test_is_label_valid() {
        assert!(is_label_valid("hello"));
        assert!(is_label_valid("test-domain"));
        assert!(!is_label_valid("-invalid"));
        assert!(!is_label_valid("invalid-"));
        assert!(!is_label_valid(""));
    }

    #[test]
    fn test_contains_forbidden_domain_code_point() {
        assert!(!contains_forbidden_domain_code_point("example.com"));
        assert!(contains_forbidden_domain_code_point("exam ple.com"));
        assert!(contains_forbidden_domain_code_point("example.com/path"));
    }
}