Milano Rust MeetUp 25/7/2018 MikamaiMars Rover

mr_.gitignore

.idea
/target
**/*.rs.bk
Cargo.lock
mr.iml

mr_.idea_markdown-navigator.xml

mr_.idea_markdown-navigator_profiles_settings.xml

mr_.idea_misc.xml

mr_.idea_modules.xml

mr_.idea_vcs.xml

mr_Cargo.lock

mr_Cargo.toml

[package]
name = "mr"
version = "0.1.0"
authors = ["michele <michele.damico@gmail.com>"]

[dependencies]

[dev-dependencies]
rstest = { git = "https://github.com/la10736/rstest" }

mr_mr.iml

mr_src_main.rs

#![feature(proc_macro)]
#[cfg(test)]
extern crate rstest;

use std::ops::Add;
use std::ops::Neg;

fn main() {
    println!("Hello, world!");
}

type X = i32;
type Y = i32;

#[derive(Clone, Copy, Debug)]
struct Coord(X, Y);

#[derive(PartialEq, Debug, Copy, Clone)]
enum Direction {
    North,
    East,
    South,
    West,
}

impl Direction {
    fn reverse(self) -> Direction {
        use Direction::*;
        match self {
            North => South,
            East => West,
            South => North,
            West => East,
        }
    }
}

impl Into<Coord> for (X, Y) {
    fn into(self) -> Coord {
        Coord(self.0, self.1)
    }
}

impl Into<Coord> for Direction {
    fn into(self) -> Coord {
        match self {
            Direction::North => (0, 1),
            Direction::East => (1, 0),
            Direction::South => (0, -1),
            Direction::West => (-1, 0),
        }.into()
    }
}

impl Add for Coord {
    type Output = Coord;

    fn add(self, rhs: Coord) -> <Self as Add<Coord>>::Output {
        (self.0 + rhs.0, self.1 + rhs.1).into()
    }
}

impl Neg for Coord {
    type Output = Coord;

    fn neg(self) -> <Self as Neg>::Output {
        (-self.0, -self.1).into()
    }
}

impl PartialEq<(X, Y)> for Coord {
    fn eq(&self, other: &(X, Y)) -> bool {
        self.0 == other.0 && self.1 == other.1
    }
}

struct Rover {
    position: Coord,
    direction: Direction,
}

impl Rover {
    fn exec(&mut self, cmd: char) {
        use Direction::*;

        let step = match cmd {
            'f' => self.direction,
            'b' => self.direction.reverse(),
            _ => panic!("Comando Sconosciuto '{}'", cmd)
        };

        self.position = self.position + step.into();
    }

    fn position(&self) -> Coord {
        self.position
    }

    fn direction(&self) -> Direction {
        self.direction
    }
}

#[cfg(test)]
mod test {
    use super::{*, Direction::*};

    use rstest::*;


    #[test]
    fn should_create_a_rover() {
        let rover = Rover { position: (2, 4).into(), direction: North };

        assert_eq!(rover.position(), (2, 4));
        assert_eq!(rover.direction(), North)
    }

    #[rstest_parametrize(
    direction, expected,
    case(North, Unwrap("(1, 6)")),
    case(East, Unwrap("(2, 5)")),
    case(South, Unwrap("(1, 4)")),
    case(West, Unwrap("(0, 5)")),
    )]
    fn should_move_forward(direction: Direction, expected: (X, Y)) {
        let mut rover = Rover { position: (1, 5).into(), direction };

        rover.exec('f');

        assert_eq!(rover.position(), expected)
    }

    #[rstest_parametrize(
    direction, expected,
    case(North, Unwrap("(1, 4)")),
    case(East, Unwrap("(0, 5)")),
    case(South, Unwrap("(1, 6)")),
    case(West, Unwrap("(2, 5)")),
    )]
    fn should_move_backward(direction: Direction, expected: (X, Y)) {
        let mut rover = Rover { position: (1, 5).into(), direction };

        rover.exec('b');

        assert_eq!(rover.position(), expected)
    }
}