main.rs

main.rs

// History : Event[]
// Event : Time|Period, (Person|Object)[], Action[]
// Time : basic
// Period : Time, Time

// 

use std::io;

enum LoopAction<'a> {
	Continue,
	Break,
	Switch(Box<Scene + 'a>),
}


trait Scene: Clone {
	fn enter(&self);
	fn exit(&self);
	fn process(&self, &str) -> LoopAction;
}

#[deriving(Clone)]
struct MainMenu;

impl Scene for MainMenu {
	fn enter(&self) {
		println!("Welcome to Adventury!");
		println!("");
	}

	fn exit(&self) {
		println!("Bye.");
	}

	fn process(&self, input: &str) -> LoopAction {
		match input {
			"reset" => LoopAction::Switch(box MainMenu),
			"quit" => LoopAction::Break,
			_ => LoopAction::Continue,
		}
	}
}

fn main() {
    let mut scene = box MainMenu as Box<Scene>;
    let mut new_scene: Option<Box<Scene>> = None;
	
    scene.enter();
    loop {
    	print!("> ");
    	let input = io::stdin().read_line().ok().expect("Failed to read input");
    	let action = scene.process(input.trim());

    	match action {
    		LoopAction::Continue => continue,
    		LoopAction::Break => break,
    		LoopAction::Switch(s) => {
    			new_scene = Some(s);
    		}
    	}
    	
    	new_scene = match new_scene {
    		Some(s) => {
    			scene.exit();
    			scene = s;
    			scene.enter();
    			None
    		},
    		None => None
    	};
    }
    scene.exit();
}