rustlings/exercises/enums/enums3.rs

83 lines
2.0 KiB
Rust
Raw Normal View History

2019-10-29 03:49:49 +00:00
// enums3.rs
//
2019-10-29 03:49:49 +00:00
// Address all the TODOs to make the tests pass!
//
// Execute `rustlings hint enums3` or use the `hint` watch subcommand for a
// hint.
2019-10-29 03:49:49 +00:00
2019-10-29 03:49:49 +00:00
enum Message {
2023-11-03 07:10:06 +00:00
Move(Point),
Echo(String),
ChangeColor(u8, u8, u8),
Quit
2019-10-29 03:49:49 +00:00
}
struct Point {
x: u8,
2020-08-10 14:24:21 +00:00
y: u8,
2019-10-29 03:49:49 +00:00
}
struct State {
color: (u8, u8, u8),
position: Point,
2020-08-10 14:24:21 +00:00
quit: bool,
2023-09-13 18:26:47 +00:00
message: String,
2019-10-29 03:49:49 +00:00
}
impl State {
fn change_color(&mut self, color: (u8, u8, u8)) {
self.color = color;
}
fn quit(&mut self) {
self.quit = true;
}
2023-09-13 18:26:47 +00:00
fn echo(&mut self, s: String) {
self.message = s
}
2019-10-29 03:49:49 +00:00
fn move_position(&mut self, p: Point) {
self.position = p;
}
fn process(&mut self, message: Message) {
// TODO: create a match expression to process the different message
// variants
// Remember: When passing a tuple as a function argument, you'll need
// extra parentheses: fn function((t, u, p, l, e))
2023-11-03 07:10:06 +00:00
match message {
Message::Move(point) => self.move_position(point),
Message::Echo(echo) => self.echo(echo),
Message::ChangeColor(red, green, blue) => self.change_color((red,green,blue)),
Message::Quit => self.quit(),
}
2019-10-29 03:49:49 +00:00
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_match_message_call() {
2020-08-10 14:24:21 +00:00
let mut state = State {
2019-10-29 03:49:49 +00:00
quit: false,
2020-08-10 14:24:21 +00:00
position: Point { x: 0, y: 0 },
color: (0, 0, 0),
message: "hello world".to_string(),
2019-10-29 03:49:49 +00:00
};
state.process(Message::ChangeColor(255, 0, 255));
state.process(Message::Echo(String::from("Hello world!")));
2020-08-10 14:24:21 +00:00
state.process(Message::Move(Point { x: 10, y: 15 }));
2019-10-29 03:49:49 +00:00
state.process(Message::Quit);
assert_eq!(state.color, (255, 0, 255));
assert_eq!(state.position.x, 10);
assert_eq!(state.position.y, 15);
assert_eq!(state.quit, true);
assert_eq!(state.message, "Hello world!");
2019-10-29 03:49:49 +00:00
}
}