//! Helper functions for special characters

/// Known special buttons
pub enum SpecialButton {
    Home,
    Insert,
    Delete,
    ArrowUp,
    ArrowDown,
    ArrowRight,
    ArrowLeft,
    Unknown
}

/// map special buttons to SpecialButton
pub fn get_special_char(ch: &u8) -> SpecialButton {
    match *ch {
        0x31 => { SpecialButton::Home       }
        0x32 => { SpecialButton::Insert     }
        0x33 => { SpecialButton::Delete     }
        0x41 => { SpecialButton::ArrowUp    }
        0x42 => { SpecialButton::ArrowDown  }
        0x43 => { SpecialButton::ArrowRight }
        0x44 => { SpecialButton::ArrowLeft  }
        _    => { SpecialButton::Unknown    }
    }
}

/// if character received is backspace
pub fn is_backspace(ch: &u8) -> bool {
    if *ch == 0x08 { return true }
    false
}

/// if character received is any number below 'space' in ascii.
pub fn is_boring(ch: &u8) -> bool {
    if *ch <= 0x1F {return true}
    false
}