base work on level selecting

adaptive_game_module/level_selector.py

@@ -0,0 +1,35 @@
+import yaml  # reads hint configurations from a .yml file
+
+class LevelSelector:
+    def __init__(self, tool_list_filename):
+        self.read_level_requirements(filename)
+        self.read_tool_list(filename)
+        self.known_tools = []
+
+    def read_level_requirements(self, filename):  
+        with open(filename) as f:
+            self.level_requirements = yaml.load(f, Loader=yaml.FullLoader)
+
+    def read_tool_list(self, filename):
+        with open(filename) as f:
+            self.tool_list = yaml.load(f, Loader=yaml.FullLoader)
+
+    def add_known_tool(self, tool):
+        if tool in self.known_tools:
+            return
+        self.known_tools.append(tool)
+
+    def next_level(self, current_level, current_time):
+        next_levels = self.level_requirements[level]
+        if len(next_levels) == 1:
+            return next_levels[0][0]
+        candidate_level = None
+        for {level, requirements} in next_levels:
+            if requirements is None:
+                candidate_level = level
+            elif ((requirements[0] < current_time) and (requirements[1] in self.known_tools)):
+                candidate_level = level
+            else:
+                pass
+        return candidate_level
+