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use std::env;
use std::fs;
use std::io::{self, BufRead};
type BusWidth = i32;
type IOType = i32;
type IOData = Vec<IOType>;
fn read_program(filename: &str) -> Vec<BusWidth> {
let contents = fs::read_to_string(filename)
.expect(filename);
contents.split(',').map(|v| {
v.trim_end().parse().unwrap()
}).collect()
}
#[derive(Debug)]
enum Arithm {
Add,
Mul,
LessThan,
Equals,
}
#[derive(Debug)]
enum IO {
In,
Out,
}
#[derive(Debug)]
enum Jmp {
JmpTrue,
JmpFalse,
}
#[derive(Debug, PartialEq)]
enum ParameterMode {
Position,
Immediate,
}
fn arithm(op:Arithm, ip:usize, modes:Vec<ParameterMode>, memory:&mut Vec<BusWidth>) {
if modes[2] == ParameterMode::Immediate {
panic!("Instruction can not store in immediate mode parameter. (IP: {})", ip);
}
let params:Vec<usize> = (0..=2).map(|n| match &modes[n] {
ParameterMode::Position => memory[ip + n + 1] as usize,
ParameterMode::Immediate => ip + n + 1,
}).collect();
let left = params[0];
let right = params[1];
let result = params[2];
match op {
Arithm::Add => memory[result] = memory[left] + memory[right],
Arithm::Mul => memory[result] = memory[left] * memory[right],
Arithm::LessThan => memory[result] = if memory[left] < memory[right] { 1 } else { 0 },
Arithm::Equals => memory[result] = if memory[left] == memory[right] { 1 } else { 0 },
}
}
fn jmp(op:Jmp, ip:usize, modes:Vec<ParameterMode>, memory:&mut Vec<BusWidth>) -> usize {
let params:Vec<usize> = (0..=2).map(|n| match &modes[n] {
ParameterMode::Position => memory[ip + n + 1] as usize,
ParameterMode::Immediate => ip + n + 1,
}).collect();
let value = params[0];
let address = params[1];
match op {
Jmp::JmpTrue => (if memory[value] != 0 { memory[address] as usize } else { ip + 3 }),
Jmp::JmpFalse => (if memory[value] == 0 { memory[address] as usize } else { ip + 3 }),
}
}
fn io(op: IO, ip: usize, modes: Vec<ParameterMode>, memory:&mut Vec<BusWidth>, input:&mut IOData,
output:&mut IOData, var_io: bool)
{
let stdin = io::stdin();
match op {
IO::In => {
let address = match &modes[0] {
ParameterMode::Position => memory[ip + 1] as usize,
ParameterMode::Immediate =>
panic!("Cannot store input in immediate mode parameter. (IP: {})", ip),
};
match var_io {
false => {
let invalue = stdin.lock().lines().next().map(|s| {
match s {
Ok(s) => Some(s.trim_end().trim_start().parse::<BusWidth>().unwrap()),
_ => None,
}
});
match invalue {
Some(v) => memory[address] = v.unwrap() as BusWidth,
_ => {},
};
},
true => {
memory[address] = input.remove(0) as BusWidth;
},
}
},
IO::Out => {
let o = match &modes[0] {
ParameterMode::Position => memory[memory[ip + 1] as usize],
ParameterMode::Immediate => memory[ip + 1],
};
println!("{}", o);
if var_io {
output.push(o as IOType);
}
},
}
}
fn intcode<F>(mut memory:Vec<BusWidth>, mut input: &mut IOData, mut output:&mut IOData,
f: F, var_io: bool) where
F: Fn(&mut Vec<BusWidth>, &mut IOData, &mut IOData)
{
let mut ip = 0;
while ip < memory.len() {
let op = memory[ip] % 100;
let modes:Vec<ParameterMode> = (2..=4).map(|e| memory[ip] / 10i32.pow(e) as BusWidth % 10)
.map(|n| match n {
0 => ParameterMode::Position,
1 => ParameterMode::Immediate,
p => panic!("Invalid parameter mode {} at IP: {}", p, ip),
}).collect();
match op {
1 => { arithm(Arithm::Add, ip, modes, &mut memory); ip += 4 },
2 => { arithm(Arithm::Mul, ip, modes, &mut memory); ip += 4 },
7 => { arithm(Arithm::LessThan, ip, modes, &mut memory); ip += 4 },
8 => { arithm(Arithm::Equals, ip, modes, &mut memory); ip += 4 },
3 => { io(IO::In, ip, modes, &mut memory, &mut input, &mut output, var_io); ip += 2 },
4 => { io(IO::Out, ip, modes, &mut memory, &mut input, &mut output, var_io); ip += 2 },
5 => { ip = jmp(Jmp::JmpTrue, ip, modes, &mut memory); },
6 => { ip = jmp(Jmp::JmpFalse, ip, modes, &mut memory); },
99 => break,
op => panic!("Invalid operation {} at IP: {}", op, ip),
}
if var_io {
f(&mut memory, &mut input, &mut output);
}
}
}
fn func(_memory:&mut Vec<BusWidth>, input:&mut IOData, output:&mut IOData) {
if output.len() > 0 && input.len() > 0 {
let v = output.remove(0);
input.insert(1, v);
}
}
fn main() {
let args: Vec<String> = env::args().collect();
let mut opts = getopts::Options::new();
opts.reqopt("m", "mode", "Mode of IO operations", "[arg|stdio]");
opts.reqopt("p", "program", "File to load program from", "FILE");
let matches = match opts.parse(&args[1..]) {
Ok(m) => { m }
Err(f) => { panic!(f.to_string()) }
};
let program:String = matches.opt_str("program").unwrap();
let mode = matches.opt_str("mode").unwrap();
let memory = read_program(&program);
if mode == "arg" {
let mut input:IOData = matches.free[0].split(",").map(|v| {
let i = v.trim_end().parse().unwrap();
i
}).collect();
let mut output = Vec::new();
while input.len() > 1 {
intcode(memory.clone(), &mut input, &mut output, &func, true);
}
} else if mode == "stdio" {
let mut input = vec![];
let mut output = vec![];
intcode(memory.clone(), &mut input, &mut output, &func, false);
} else {
panic!("Unknown mode: {}", mode);
}
}
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