Add makes_use_of function

Author: gaffneytj

axelrod/makes_use_of.py

@@ -0,0 +1,18 @@
+import inspect
+import re
+from typing import Set, Text, Type
+
+from axelrod.player import Player
+
+
+def makes_use_of(player: Type[Player]) -> Set[Text]:
+    result = set()
+    for method in inspect.getmembers(player, inspect.ismethod):
+        if method[0] == "__init__":
+            continue
+        method_code = inspect.getsource(method[1])
+        attr_string = r"self.match_attributes\[\"(\w+)\"\]"
+        all_attrs = re.findall(attr_string, method_code)
+        for attr in all_attrs:
+            result.add(attr)
+    return result

axelrod/tests/unit/test_makes_use_of.py

@@ -0,0 +1,47 @@
+"""Tests for makes_use_of."""
+
+import unittest
+
+import axelrod as axl
+from axelrod.makes_use_of import makes_use_of
+
+
+class TestMakesUseOfLengthAndGamePlayer(axl.Player):
+    """
+    Should have some function that uses length
+    """
+
+    def first_function(self):  # pragma: no cover
+        x = 1 + 2
+        x * 5
+
+    def second_function(self):  # pragma: no cover
+        # We put this in the second function to make sure both are checked.
+        x = 1 + self.match_attributes["length"]
+
+        # Should only add once.
+        y = 2 + self.match_attributes["length"]
+
+        # Should also add game.
+        self.match_attributes["game"]
+
+
+class TestMakesUseOfNothingPlayer(axl.Player):
+    """
+    Doesn't use match_attributes
+    """
+
+    def only_function(self):  # pragma: no cover
+        1 + 2 + 3
+        print("=6")
+
+
+class TestMakesUseOf(unittest.TestCase):
+    def test_makes_use_of_length_and_game(self):
+        self.assertEqual(
+            makes_use_of(TestMakesUseOfLengthAndGamePlayer()),
+            {"length", "game"},
+        )
+
+    def test_makes_use_of_empty(self):
+        self.assertEqual(makes_use_of(TestMakesUseOfNothingPlayer()), set())