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Closes #17728.
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// Copyright 2014 The Rust Project Developers. See the COPYRIGHT | ||
// file at the top-level directory of this distribution and at | ||
// http://rust-lang.org/COPYRIGHT. | ||
// | ||
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or | ||
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license | ||
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your | ||
// option. This file may not be copied, modified, or distributed | ||
// except according to those terms. | ||
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use std::fmt::{Show, Formatter, Error}; | ||
use std::collections::HashMap; | ||
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trait HasInventory { | ||
fn getInventory<'s>(&'s self) -> &'s mut Inventory; | ||
fn addToInventory(&self, item: &Item); | ||
fn removeFromInventory(&self, itemName: &str) -> bool; | ||
} | ||
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trait TraversesWorld { | ||
fn attemptTraverse(&self, room: &Room, directionStr: &str) -> Result<&Room, &str> { | ||
let direction = str_to_direction(directionStr); | ||
let maybe_room = room.direction_to_room.find(&direction); | ||
//~^ ERROR cannot infer an appropriate lifetime for autoref due to conflicting requirements | ||
match maybe_room { | ||
Some(entry) => Ok(entry), | ||
_ => Err("Direction does not exist in room.") | ||
} | ||
} | ||
} | ||
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#[deriving(Show, Eq, PartialEq, Hash)] | ||
enum RoomDirection { | ||
West, | ||
East, | ||
North, | ||
South, | ||
Up, | ||
Down, | ||
In, | ||
Out, | ||
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None | ||
} | ||
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struct Room { | ||
description: String, | ||
items: Vec<Item>, | ||
direction_to_room: HashMap<RoomDirection, Room>, | ||
} | ||
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impl Room { | ||
fn new(description: &'static str) -> Room { | ||
Room { | ||
description: description.to_string(), | ||
items: Vec::new(), | ||
direction_to_room: HashMap::new() | ||
} | ||
} | ||
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fn add_direction(&mut self, direction: RoomDirection, room: Room) { | ||
self.direction_to_room.insert(direction, room); | ||
} | ||
} | ||
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struct Item { | ||
name: String, | ||
} | ||
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struct Inventory { | ||
items: Vec<Item>, | ||
} | ||
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impl Inventory { | ||
fn new() -> Inventory { | ||
Inventory { | ||
items: Vec::new() | ||
} | ||
} | ||
} | ||
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struct Player { | ||
name: String, | ||
inventory: Inventory, | ||
} | ||
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impl Player { | ||
fn new(name: &'static str) -> Player { | ||
Player { | ||
name: name.to_string(), | ||
inventory: Inventory::new() | ||
} | ||
} | ||
} | ||
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impl TraversesWorld for Player { | ||
} | ||
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impl Show for Player { | ||
fn fmt(&self, formatter: &mut Formatter) -> Result<(), Error> { | ||
formatter.write_str("Player{ name:"); | ||
formatter.write_str(self.name.as_slice()); | ||
formatter.write_str(" }"); | ||
Ok(()) | ||
} | ||
} | ||
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fn str_to_direction(to_parse: &str) -> RoomDirection { | ||
match to_parse { | ||
"w" | "west" => RoomDirection::West, | ||
"e" | "east" => RoomDirection::East, | ||
"n" | "north" => RoomDirection::North, | ||
"s" | "south" => RoomDirection::South, | ||
"in" => RoomDirection::In, | ||
"out" => RoomDirection::Out, | ||
"up" => RoomDirection::Up, | ||
"down" => RoomDirection::Down, | ||
_ => None //~ ERROR mismatched types | ||
} | ||
} | ||
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fn main() { | ||
let mut player = Player::new("Test player"); | ||
let mut room = Room::new("A test room"); | ||
println!("Made a player: {}", player); | ||
println!("Direction parse: {}", str_to_direction("east")); | ||
match player.attemptTraverse(&room, "west") { | ||
Ok(_) => println!("Was able to move west"), | ||
Err(msg) => println!("Not able to move west: {}", msg) | ||
}; | ||
} |