From 9d38cb75c2e23a173adc7e390777c50361c31436 Mon Sep 17 00:00:00 2001
From: Tom van der Lee <t0m.vd.l33@gmail.com>
Date: Mon, 14 Dec 2020 11:35:46 +0100
Subject: Added day 8

---
 day8/__init__.py | 75 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 75 insertions(+)
 create mode 100644 day8/__init__.py

(limited to 'day8/__init__.py')

diff --git a/day8/__init__.py b/day8/__init__.py
new file mode 100644
index 0000000..c6d086a
--- /dev/null
+++ b/day8/__init__.py
@@ -0,0 +1,75 @@
+from copy import copy
+from typing import Generator, Iterator, Any, List, Tuple
+
+from aoc import BaseAssignment
+
+
+class Assignment(BaseAssignment):
+    @staticmethod
+    def acc(line, accumulated_value, value):
+        return line + 1, accumulated_value + value
+
+    @staticmethod
+    def jmp(line, accumulated_value, value):
+        return line + value, accumulated_value
+
+    @staticmethod
+    def nop(line, accumulated_value, value):
+        return line + 1, accumulated_value
+
+    def read_input(self, example=False) -> List:
+        return list(super().read_input(example))
+
+    def parse_item(self, item: str) -> Tuple:
+        instruction, value = item.split(' ')
+
+        return getattr(self, instruction), int(value)
+
+    def run(self, input: List) -> int:
+        executed_lines = set()
+        accumulated_value = 0
+        line = 0
+
+        while True:
+            if line in executed_lines:
+                raise Exception(
+                    f'Loop detected at line: {line}. '
+                    f'Accumulated value: {accumulated_value}'
+                )
+
+            try:
+                instruction, value = input[line]
+            except IndexError:
+                break
+
+            executed_lines.add(line)
+            line, accumulated_value = instruction(
+                line, accumulated_value, value
+            )
+
+        return accumulated_value
+
+
+class AssignmentOne(Assignment):
+    pass
+
+
+class AssignmentTwo(Assignment):
+    def patch_instructions(self, input: List) -> Generator:
+        for index, (instruction, value) in enumerate(input):
+            if instruction is self.acc:
+                continue
+
+            patched_input = copy(input)
+            patched_input[index] = (
+                self.nop if instruction is self.jmp else self.jmp,
+                value
+            )
+            yield patched_input
+
+    def run(self, input: List) -> int:
+        for patched_input in self.patch_instructions(input):
+            try:
+                return super().run(patched_input)
+            except Exception:
+                continue
-- 
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