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