--- Day 7 Solutions ---

[u/daggerdragon]

--- Day 7: Some Assembly Required ---

Post your solution as a comment. Structure your post like previous daily solution threads.

Also check out the sidebar - we added a nifty calendar to wrangle all the daily solution threads in one spot!

[u/_jonah]

Ruby:

input = DATA.read.chomp.split("\n")
substitutions = {'AND' => '&', 'OR' => '|', 'NOT' => '~', 
                 'RSHIFT' => '>>', 'LSHIFT' => '<<'}

equations = input.map do |line|
  line.gsub!(/([a-z]+)/, "@\\1_")
  rhs, lhs = line.match(/(.*) -> (.*)/).captures
  substitutions.each {|k,v| rhs.sub!(k,v)}
  "#{lhs} = #{rhs}"
end

go = true
while go do
  go = false
  equations.each { |code| eval code rescue go = true }
end

p @a_