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use std::{fmt, str::FromStr};
use sdl2::keyboard::{Keycode, Mod};
#[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
pub struct Keybind {
keycode: Keycode,
keymod: Mod,
}
impl Keybind {
pub fn new(keycode: Keycode, keymod: Mod) -> Self {
Self { keycode, keymod }
}
}
// ctrl keys: C-<letter> len 3
// shift keys: S-<letter> len 3
// normal keys: <letter> len 1
#[derive(Debug, Copy, Clone, PartialEq)]
pub enum KeybindError {
Parse,
InvalidMod,
InvalidKey,
}
impl fmt::Display for KeybindError {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
match self {
Self::Parse => write!(f, "error parsing keybind"),
Self::InvalidKey => write!(f, "unsupported keybind, try `A-Z0-9`"),
Self::InvalidMod => {
write!(f, "unsupported keybind modifier, try `C-<key> or S-<key>`")
}
}
}
}
impl std::error::Error for KeybindError {}
impl FromStr for Keybind {
type Err = KeybindError;
fn from_str(s: &str) -> Result<Self, Self::Err> {
parse_from_str(s)
}
}
fn parse_from_str(s: &str) -> Result<Keybind, KeybindError> {
let s = s.to_lowercase();
match s.len() {
// either ctrl or shift key
3 => {
let keymod = parse_modifier(&s[..2])?;
let keybind = parse_keybind(&s[2..])?;
Ok(Keybind::new(keybind, keymod))
}
1 => {
let keybind = parse_keybind(&s)?;
Ok(Keybind::new(keybind, Mod::NOMOD))
}
_ => Err(KeybindError::Parse),
}
}
fn parse_modifier(s: &str) -> Result<Mod, KeybindError> {
match s {
"c-" => Ok(Mod::LCTRLMOD),
"s-" => Ok(Mod::LSHIFTMOD),
_ => Err(KeybindError::InvalidMod),
}
}
fn parse_keybind(s: &str) -> Result<Keycode, KeybindError> {
match s.to_uppercase().as_str() {
"0" => Ok(Keycode::Num0),
"1" => Ok(Keycode::Num1),
"2" => Ok(Keycode::Num2),
"3" => Ok(Keycode::Num3),
"4" => Ok(Keycode::Num4),
"5" => Ok(Keycode::Num5),
"6" => Ok(Keycode::Num6),
"7" => Ok(Keycode::Num7),
"8" => Ok(Keycode::Num8),
"9" => Ok(Keycode::Num9),
"A" | "B" | "C" | "D" | "E" | "F" | "G" | "H" | "I" | "J" | "K" | "L" | "M" | "N" | "O"
| "P" | "Q" | "R" | "S" | "T" | "U" | "V" | "W" | "X" | "Y" | "Z" => {
Ok(Keycode::from_name(s).unwrap())
}
_ => Err(KeybindError::InvalidKey),
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn without_mod() {
assert_eq!(
Keybind::from_str("x").unwrap(),
Keybind::new(Keycode::X, Mod::NOMOD)
);
assert_eq!(
Keybind::from_str("X").unwrap(),
Keybind::new(Keycode::X, Mod::NOMOD)
);
}
#[test]
fn with_ctrl_mod() {
assert_eq!(
Keybind::from_str("c-x").unwrap(),
Keybind::new(Keycode::X, Mod::LCTRLMOD)
);
assert_eq!(
Keybind::from_str("C-x").unwrap(),
Keybind::new(Keycode::X, Mod::LCTRLMOD)
);
assert_eq!(
Keybind::from_str("c-X").unwrap(),
Keybind::new(Keycode::X, Mod::LCTRLMOD)
);
assert_eq!(
Keybind::from_str("C-X").unwrap(),
Keybind::new(Keycode::X, Mod::LCTRLMOD)
);
}
#[test]
fn with_shift_mod() {
assert_eq!(
Keybind::from_str("s-x").unwrap(),
Keybind::new(Keycode::X, Mod::LSHIFTMOD)
);
assert_eq!(
Keybind::from_str("S-x").unwrap(),
Keybind::new(Keycode::X, Mod::LSHIFTMOD)
);
assert_eq!(
Keybind::from_str("s-X").unwrap(),
Keybind::new(Keycode::X, Mod::LSHIFTMOD)
);
assert_eq!(
Keybind::from_str("S-X").unwrap(),
Keybind::new(Keycode::X, Mod::LSHIFTMOD)
);
}
}
|
