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|
use bevy::{app::AppExit, prelude::*};
use std::convert::TryFrom;
use std::io::{BufRead, BufReader};
use std::{collections::BTreeSet, fs::File};
fn main() {
App::build()
.add_resource(WindowDescriptor {
title: "Advent of Code".to_string(),
width: 1920,
height: 1080,
..Default::default()
})
.add_resource(ClearColor(Color::rgb(0., 0., 0.)))
.add_startup_system(setup_camera.system())
.add_startup_system(read_input_file.system())
.add_stage("check_line")
.add_system_to_stage("check_line", track_program_line_execution.system())
.add_system_to_stage("check_line", track_program_termination.system())
.add_stage("exec")
.add_system_to_stage("exec", tick_computer.system())
.add_system_to_stage("exec", exit.system())
.add_plugins(DefaultPlugins)
.run();
}
fn setup_camera(mut commands: Commands) {
commands.spawn(Camera2dComponents::default());
}
struct Program {
ops: Vec<Op>,
}
#[derive(Clone)]
enum Op {
Acc(i32),
Jmp(i32),
Nop(i32),
}
struct UnalteredProgram;
#[derive(Default)]
struct Computer {
program_counter: i32,
accumulator: i32,
termiated: bool,
}
#[derive(Default)]
struct LineTracker(BTreeSet<i32>);
impl Computer {
fn exec(&mut self, program: &Program) {
if self.termiated {
return;
}
let x = usize::try_from(self.program_counter).ok();
match x.and_then(|x| program.ops.get(x)) {
None => {}
Some(Op::Acc(val)) => {
self.accumulator += val;
self.program_counter += 1;
}
Some(Op::Jmp(val)) => {
self.program_counter += val;
}
Some(Op::Nop(_)) => {
self.program_counter += 1;
}
}
if self.program_counter >= program.ops.len() as i32 {
self.termiated = true;
}
}
}
fn read_input_file(mut commands: Commands) {
let f = File::open("./inputs/day_8.txt").unwrap();
let ops: Vec<Op> = BufReader::new(f)
.lines()
.map(|line| {
let line = line.unwrap();
let line = line.trim();
let mut line_parts = line.split_whitespace();
let opcode = line_parts.next().unwrap();
let val: i32 = line_parts.next().unwrap().parse().unwrap();
let op = match opcode {
"acc" => Op::Acc(val),
"jmp" => Op::Jmp(val),
"nop" => Op::Nop(val),
_ => panic!("Invalid opcode"),
};
op
})
.collect();
commands.spawn((
UnalteredProgram,
Program { ops: ops.clone() },
Computer::default(),
LineTracker::default(),
));
for i in 0..ops.len() {
let mut ops = ops.clone();
ops[i] = match ops[i] {
Op::Nop(v) => Op::Jmp(v),
Op::Jmp(v) => Op::Nop(v),
Op::Acc(v) => Op::Acc(v),
};
commands.spawn((
Program { ops: ops.clone() },
Computer::default(),
LineTracker::default(),
));
}
}
fn track_program_line_execution(
mut commands: Commands,
entity: Entity,
mut line_tracker: Mut<LineTracker>,
computer: &Computer,
unaltered: Option<&UnalteredProgram>,
) {
if line_tracker.0.contains(&computer.program_counter) {
if unaltered.is_some() {
println!(
"About to execute a line for the second time! Line {}. Accumulator: {}",
computer.program_counter, computer.accumulator
);
}
commands.despawn(entity);
} else {
line_tracker.0.insert(computer.program_counter);
}
}
fn track_program_termination(mut commands: Commands, entity: Entity, computer: &Computer) {
if computer.termiated {
println!("Program terminated! Accumulator: {}", computer.accumulator);
commands.despawn(entity);
}
}
fn tick_computer(mut computer: Mut<Computer>, program: &Program) {
computer.exec(program);
}
fn exit(mut exit_events: ResMut<Events<AppExit>>, computers: Query<&Computer>) {
if computers.iter().len() == 0 {
exit_events.send(AppExit);
}
}
|
