Watch
1
0
Fork
You've already forked advent-of-code
0
advent-of-code/2019/day5/intcode.rb
2021-12-04 21:20:33 -08:00

163 lines
3.4 KiB
Ruby

# frozen_string_literal: true
module Intcode
def self.read(filename)
parse File.read(filename)
end
def self.parse(input)
cleaned = input
.gsub(/^#.*$/, '')
.gsub('\s', '')
Program.new cleaned.split(',').map(&:to_i)
end
class Memory < Array
def to_s
batch_size = 10
output = String.new
each_slice(batch_size).each_with_index do |batch, idx|
prefix = idx * batch_size
output << "#{prefix}: #{batch.join(' ')}\n"
end
output
end
end
class Program
attr_accessor :mem
def initialize(mem)
@input = nil
@initial_state = mem
end
def on_input(&block)
@input = block
end
def run
@mem = Memory.new(@initial_state.clone)
pc = 0
loop do
opcode = operation(mem[pc])
mode = modes(mem[pc])
case opcode
when 1
r1 = mem[pc + 1]
r2 = mem[pc + 2]
r3 = mem[pc + 3]
a = param(r1, mode[0])
b = param(r2, mode[1])
raise StandardError, "unexpected mode: #{mode[2]}" if mode[2] != 0
mem[r3] = a + b
pc += 4
when 2
r1 = mem[pc + 1]
r2 = mem[pc + 2]
r3 = mem[pc + 3]
a = param(r1, mode[0])
b = param(r2, mode[1])
raise StandardError, "unexpected mode: #{mode[2]}" if mode[2] != 0
mem[r3] = a * b
pc += 4
when 3
r1 = mem[pc + 1]
raise StandardError, "unexpected mode: #{mode[0]}" if mode[0] != 0
mem[r1] = input
pc += 2
when 4
r1 = mem[pc + 1]
output = param(r1, mode[0])
puts "output: #{output}"
pc += 2
when 5
r1 = mem[pc + 1]
r2 = mem[pc + 2]
a = param(r1, mode[0])
b = param(r2, mode[1])
if !a.zero?
pc = b
else
pc += 3
end
when 6
r1 = mem[pc + 1]
r2 = mem[pc + 2]
a = param(r1, mode[0])
b = param(r2, mode[1])
if a.zero?
pc = b
else
pc += 3
end
when 7
r1 = mem[pc + 1]
r2 = mem[pc + 2]
r3 = mem[pc + 3]
a = param(r1, mode[0])
b = param(r2, mode[1])
raise StandardError, "unexpected mode: #{mode[2]}" if mode[2] != 0
mem[r3] = a < b ? 1 : 0
pc += 4
when 8
r1 = mem[pc + 1]
r2 = mem[pc + 2]
r3 = mem[pc + 3]
a = param(r1, mode[0])
b = param(r2, mode[1])
raise StandardError, "unexpected mode: #{mode[2]}" if mode[2] != 0
mem[r3] = a == b ? 1 : 0
pc += 4
when 99
return mem[0]
else
raise StandardError, "unexpected opcode: #{opcode}"
end
end
end
private
def input
print 'input> '
return default_input if @input.nil?
inp = @input.call
puts inp
inp
end
def default_input
gets.to_i
end
def operation(cell)
(cell % 100)
end
def modes(cell)
m = Hash.new(0)
(cell / 100).truncate.digits.each_with_index do |d, i|
m[i] = d
end
m
end
def param(val, mode)
case mode
when 0
mem[val]
when 1
val
else
raise StandardError, "unexpected mode: #{mode}"
end
end
end
end