Added 2017 day 19

Author: AlexeSimon

2017/19/code.py

@@ -0,0 +1,80 @@
+# Advent of code Year 2017 Day 19 solution
+# Author = Alexe Simon
+# Date = December 2018
+
+with open((__file__.rstrip("code.py")+"input.txt"), 'r') as input_file:
+    input = input_file.read()
+
+
+class MazeRunner:
+    def __init__(self, source):
+        self.source = source
+        self.maze = [line.rstrip('\n') for line in source.split("\n")]
+        self.hist = []
+        self.posx = 0
+        self.posy = 0
+        self.vel = "stuck" # "down", "right", "left", "up", "stuck"
+        self.steps = 0
+        self.findEntry()
+    
+    def step(self):
+        if self.vel == "down":
+            self.posy += 1
+        elif self.vel == "up":
+            self.posy -= 1
+        elif self.vel == "right":
+            self.posx += 1
+        elif self.vel == "left":
+            self.posx -= 1
+        self.steps += 1
+    
+    def findEntry(self):
+        while self.maze[self.posy][self.posx] != '|':
+            self.posx += 1
+        self.vel = "down"
+    
+    def changeVel(self):
+        searching = True
+        if searching and self.posx+1 < len(self.maze[self.posy]):
+            if self.maze[self.posy][self.posx+1] == '-' and self.vel != "left":
+                self.vel = "right"
+                searching = False
+                
+        if searching and self.posx-1 > 0:    
+            if self.maze[self.posy][self.posx-1] == '-' and self.vel != "right":
+                self.vel = "left"
+                searching = False
+                
+        if searching and self.posy+1 < len(self.maze):
+            if self.maze[self.posy+1][self.posx] == '|' and self.vel != "up":
+                self.vel = "down"
+                searching = False
+                
+        if searching and self.posy-1 > 0:
+            if self.maze[self.posy-1][self.posx] == '|' and self.vel != "down":
+                self.vel = "up"
+                searching = False
+                
+        if searching:
+            self.vel = "stuck"
+    
+    def walkThrough(self):
+        while self.vel != "stuck":
+            while self.maze[self.posy][self.posx] in ['|','-']:
+                self.step()
+            if self.maze[self.posy][self.posx] == '+':
+                self.changeVel()
+                self.step()
+            elif self.maze[self.posy][self.posx] == ' ':
+                return 1
+            else:
+                self.hist.append(self.maze[self.posy][self.posx])
+                self.step()
+        return 0
+            
+    
+maze = MazeRunner(input)
+maze.walkThrough()
+
+print("Part One : "+ ''.join(maze.hist))
+print("Part Two : "+ str(maze.steps))