157 lines
3.9 KiB
Python
157 lines
3.9 KiB
Python
""" Intcode interpreter. Day 9. """
|
|
|
|
from enum import IntEnum
|
|
import sys
|
|
|
|
|
|
class Op(IntEnum):
|
|
ADD = 1
|
|
MUL = 2
|
|
IN = 3
|
|
OUT = 4
|
|
JNZ = 5
|
|
JEZ = 6
|
|
LT = 7
|
|
EQ = 8
|
|
SRB = 9
|
|
HALT = 99
|
|
|
|
|
|
class PMode(IntEnum):
|
|
POS = 0
|
|
IMM = 1
|
|
REL = 2
|
|
|
|
|
|
class Intcode(object):
|
|
|
|
def __init__(self, program, print_output=False):
|
|
self._memory = program.copy()
|
|
self.ip = 0
|
|
self.rel_base = 0
|
|
self.inputs = []
|
|
self.ctx_op = None
|
|
self.ctx_modes = None
|
|
self.halt = False
|
|
self.outputs = []
|
|
self.print_output = print_output
|
|
|
|
@staticmethod
|
|
def parse_input(text):
|
|
return [int(i) for i in text.rstrip().split(",")]
|
|
|
|
def run(self, inputs=None):
|
|
self.inputs = inputs or []
|
|
handlers = self.get_handlers()
|
|
while not self.halt:
|
|
self.read_code()
|
|
handler = handlers.get(self.ctx_op)
|
|
if not handler:
|
|
sys.exit("Wrong opcode: {}".format(self.ctx_op))
|
|
try:
|
|
handler()
|
|
except Exception as exc:
|
|
sys.exit("Exception: {}".format(exc))
|
|
return self.outputs[-1] if self.outputs else 0
|
|
|
|
def get_handlers(self):
|
|
return {
|
|
Op.ADD: self.op_add,
|
|
Op.MUL: self.op_mul,
|
|
Op.IN: self.op_in,
|
|
Op.OUT: self.op_out,
|
|
Op.JNZ: self.op_jnz,
|
|
Op.JEZ: self.op_jez,
|
|
Op.LT: self.op_lt,
|
|
Op.EQ: self.op_eq,
|
|
Op.SRB: self.op_srb,
|
|
Op.HALT: self.op_halt,
|
|
}
|
|
|
|
def mem_get(self, pos):
|
|
self._check_memory_limits(pos)
|
|
return self._memory[pos]
|
|
|
|
def mem_set(self, pos, value):
|
|
self._check_memory_limits(pos)
|
|
self._memory[pos] = value
|
|
|
|
def _check_memory_limits(self, index):
|
|
if index >= len(self._memory):
|
|
self._extend_memory(index + 1)
|
|
|
|
def _extend_memory(self, new_size):
|
|
if len(self._memory) >= new_size:
|
|
return
|
|
self._memory += [0] * (new_size - len(self._memory))
|
|
|
|
def read_code(self):
|
|
code = self.mem_get(self.ip)
|
|
self.ctx_op = code % 100
|
|
code //= 100
|
|
self.ctx_modes = []
|
|
for _ in range(0, 3):
|
|
self.ctx_modes.append(PMode(code % 10))
|
|
code //= 10
|
|
|
|
def param(self, index):
|
|
mode = self.ctx_modes[index - 1]
|
|
if mode == PMode.POS:
|
|
address = self.mem_get(self.ip + index)
|
|
return self.mem_get(address)
|
|
elif mode == PMode.IMM:
|
|
return self.mem_get(self.ip + index)
|
|
elif mode == PMode.REL:
|
|
relative_jump = self.mem_get(self.ip + index)
|
|
address = self.rel_base + relative_jump
|
|
return self.mem_get(address)
|
|
|
|
def write_pos_ofs(self, pos_offset, value):
|
|
output_pos = self.mem_get(self.ip + pos_offset)
|
|
self.mem_set(output_pos, value)
|
|
|
|
def op_add(self):
|
|
self.write_pos_ofs(3, self.param(1) + self.param(2))
|
|
self.ip += 4
|
|
|
|
def op_mul(self):
|
|
self.write_pos_ofs(3, self.param(1) * self.param(2))
|
|
self.ip += 4
|
|
|
|
def op_in(self):
|
|
self.write_pos_ofs(1, self.inputs.pop(0))
|
|
self.ip += 2
|
|
|
|
def op_out(self):
|
|
self.outputs.append(self.param(1))
|
|
if self.print_output:
|
|
print(">", self.outputs[-1])
|
|
self.ip += 2
|
|
|
|
def op_jnz(self):
|
|
if self.param(1) != 0:
|
|
self.ip = self.param(2)
|
|
else:
|
|
self.ip += 3
|
|
|
|
def op_jez(self):
|
|
if self.param(1) == 0:
|
|
self.ip = self.param(2)
|
|
else:
|
|
self.ip += 3
|
|
|
|
def op_lt(self):
|
|
self.write_pos_ofs(3, int(self.param(1) < self.param(2)))
|
|
self.ip += 4
|
|
|
|
def op_eq(self):
|
|
self.write_pos_ofs(3, int(self.param(1) == self.param(2)))
|
|
self.ip += 4
|
|
|
|
def op_srb(self):
|
|
self.rel_base += self.param(1)
|
|
self.ip += 2
|
|
|
|
def op_halt(self):
|
|
self.halt = True
|