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Implement input and output instructions

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Wesley Moore 2019-12-07 13:58:11 +11:00
parent e657f6ec9f
commit c32aac3153
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GPG key ID: BF67766C0BC2D0EE
1 changed files with 38 additions and 17 deletions
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51
2019/src/computer.rs
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@ -1,10 +1,14 @@
use std::io;
use std::io::Write;
use std::str::FromStr;
type Address = i32;
#[derive(Debug, Eq, PartialEq)]
enum Instruction {
Add(Mode, Mode),
Multiply(Mode, Mode),
Input(Mode),
Input,
Output(Mode),
Halt,
}
@ -15,7 +19,7 @@ enum Mode {
Address,
}
struct Memory<'a> {
pub struct Memory<'a> {
mem: &'a mut [i32],
}
@ -35,7 +39,7 @@ fn decode(mut instruction: i32) -> Instruction {
Mode::from(divmod(&mut instruction, 10)),
Mode::from(divmod(&mut instruction, 10)),
),
3 => Instruction::Input(Mode::from(divmod(&mut instruction, 10))),
3 => Instruction::Input,
4 => Instruction::Output(Mode::from(divmod(&mut instruction, 10))),
99 => Instruction::Halt,
_ => panic!("Invalid opcode: {}", opcode),
@ -47,10 +51,10 @@ impl<'a> Memory<'a> {
Memory { mem }
}
pub fn read(&self, value: i32, mode: Mode) -> i32 {
fn read(&self, value: i32, mode: Mode) -> i32 {
match mode {
Mode::Immediate => value,
Mode::Address => self.mem[value as usize],
Mode::Immediate => self.mem[value as usize],
Mode::Address => self.mem[self.mem[value as usize] as usize],
}
}
@ -58,27 +62,43 @@ impl<'a> Memory<'a> {
self.mem[address as usize] = value;
}
fn run(&mut self, noun: i32, verb: i32) {
pub fn run(&mut self, noun: Option<i32>, verb: Option<i32>) {
if let Some(noun) = noun {
self.write(1, noun);
}
if let Some(verb) = verb {
self.write(2, verb);
}
let mut ip = 0; // instruction pointer
loop {
match decode(self.read(ip, Mode::Address)) {
match decode(self.read(ip, Mode::Immediate)) {
Instruction::Add(mode1, mode2) => {
let result = self.read(ip + 1, mode1) + self.read(ip + 1, mode2);
self.write(ip + 3, result);
let result = self.read(ip + 1, mode1) + self.read(ip + 2, mode2);
self.write(self.read(ip + 3, Mode::Immediate), result);
ip += 4;
}
Instruction::Multiply(mode1, mode2) => {
let result = self.read(ip + 1, mode1) * self.read(ip + 1, mode2);
self.write(ip + 3, result);
let result = self.read(ip + 1, mode1) * self.read(ip + 2, mode2);
self.write(self.read(ip + 3, Mode::Immediate), result);
ip += 4;
}
Instruction::Input(mode) => {
Instruction::Input => {
let mut input = String::new();
print!("Input integer: ");
io::stdout().flush().unwrap();
match io::stdin().read_line(&mut input) {
Ok(_) => {
let integer = i32::from_str(input.trim()).expect("invalid integer");
self.write(self.read(ip + 1, Mode::Immediate), integer);
}
Err(error) => panic!("error: {}", error),
}
ip += 2;
}
Instruction::Output(mode) => {
let value = self.read(ip + 1, mode);
println!("{}", value);
ip += 2;
}
Instruction::Halt => break,
@ -117,13 +137,14 @@ mod tests {
)
}
#[test]
fn test_day2() {
let input = fs::read_to_string("input/day2.txt").unwrap();
let mut data = input::read_separated_line(',', &input).unwrap();
let mut program = Memory::new(&mut data);
// Check that day2 still works wirh run through this implementation
program.run(12, 2);
assert_eq!(program.read(0, Mode::Address), 4138658);
program.run(Some(12), Some(2));
assert_eq!(program.read(0, Mode::Immediate), 4138658);
}
}