1 use std::io::{self, Read}; 2 3 pub struct Input; 4 5 impl Input { wait_keydown() -> io::Result<KeyEventType>6 pub fn wait_keydown() -> io::Result<KeyEventType> { 7 let buf: &mut [u8] = &mut [0; 8]; 8 let count = io::stdin().read(buf)?; 9 Ok(KeyCodeParser::parse(&buf[0..count])) 10 } 11 } 12 13 struct KeyCodeParser; 14 15 impl KeyCodeParser { parse(bytes: &[u8]) -> KeyEventType16 pub fn parse(bytes: &[u8]) -> KeyEventType { 17 if bytes[0] == 224 { 18 // 控制字符 19 return Self::parse_ctrl(&bytes[1..]); 20 } 21 match bytes { 22 // Enter key 23 b"\n" => KeyEventType::Enter, 24 // Tab key 25 b"\t" => KeyEventType::Tab, 26 // Esc 27 [0] => KeyEventType::Esc, 28 29 [8] => KeyEventType::Backspace, 30 31 // ASCII 字符 32 [byte] if *byte >= 32 && *byte <= 126 => KeyEventType::Common(bytes[0]), 33 // Unknown bytes 34 bytes => { 35 error!("unknown bytes {bytes:?}"); 36 KeyEventType::Unknown(bytes.to_vec()) 37 } 38 } 39 } 40 parse_ctrl(bytes: &[u8]) -> KeyEventType41 fn parse_ctrl(bytes: &[u8]) -> KeyEventType { 42 match bytes { 43 [72] => KeyEventType::Up, 44 [80] => KeyEventType::Down, 45 [75] => KeyEventType::Left, 46 [77] => KeyEventType::Right, 47 bytes => { 48 error!("unknown ctrl bytes {bytes:?}"); 49 KeyEventType::Unknown(bytes.to_vec()) 50 } 51 } 52 } 53 } 54 55 #[derive(Debug, Clone)] 56 pub enum KeyEventType { 57 Common(u8), 58 59 Up, 60 Down, 61 Right, 62 Left, 63 64 Enter, 65 Tab, 66 Backspace, 67 68 Esc, 69 70 Unknown(Vec<u8>), 71 } 72