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require "ext"
local w, h = 40, 6
local cpu = {
r = {x = 1},
isa = {
addx = {
nargs = 1,
cycles = 2,
f = function(self,v)
self.r.x = self.r.x + tonumber(v)
end
},
noop = {
nargs = 0,
cycles = 1,
f = function(self) end
}
}
}
local strength_sum = 0
local cycle = 1
for line in io.lines() do
local parts = {}
for part in line:gmatch("(%S+)") do
table.insert(parts,part)
end
local insn = table.remove(parts,1)
local ins = cpu.isa[insn]
assertf(ins, "No instruction %s in %s",insn,line)
for i = cycle,cycle + ins.cycles - 1 do
local crtpos = (i-1) % w
if crtpos + 1 == cpu.r.x or crtpos == cpu.r.x or crtpos - 1 == cpu.r.x then
io.write("#")
else
io.write(" ")
end
if i % 40 == 0 then
io.write("\n")
end
end
cycle = cycle + ins.cycles
ins.f(cpu,table.unpack(parts))
end
print(strength_sum)
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