Move more code into separate classes

It might make logical sense.  Honestly, I'm just tired of the code for
World being so long.

aoe/gather.py

@@ -1,6 +1,7 @@
 import copy
 
 from aoe.types import *
+from aoe.exceptions import *
 
 
 
@@ -136,6 +137,23 @@ class Gather():
     BIG_NUMBER = 1e6
 
 
+    def check_gather(self, world, task, count=1):
+        if task in [Tasks.IDLE, Tasks.BUILD]:
+            return
+
+        required = self.required_gather_buildings[task]
+        have = set(world.buildings)
+
+        match = any(map(have.issuperset, required))
+
+        if not match:
+            raise GatherBuildingNotAvailableException
+
+        if task == task.FARM:
+            if world.villager_tasks[task] + count > len(world.unused_farms):
+                raise GatherBuildingNotAvailableException
+
+
     def __init__(self):
         self.gather_rates = {
                 Tasks.BERRIES: 18.6/60,

aoe/housing.py

@@ -1,12 +1,22 @@
 from collections import defaultdict
 
 from aoe.types import *
+from aoe.exceptions import *
 
 
 
 class Housing():
 
 
+    def check_housing(self, world, thing):
+        required = self.required[thing]
+
+        if required > 0:
+            pop_space = world.get_population_space()
+            if world.get_effective_population() > pop_space + required:
+                raise YallGotHousedException
+
+
     def __init__(self):
         self.space = defaultdict(int, {
                       Buildings.HOUSE: 5,

aoe/production.py

@@ -1,12 +1,19 @@
 from collections import defaultdict
 
 from aoe.types import *
+from aoe.exceptions import *
 
 
 
 class Production():
 
 
+    def check_production(self, world, thing):
+        building = self.building[thing]
+        if world.production_available[building] < 1:
+            raise ProductionBuildingNotAvailableException
+
+
     # assumes for now each unit can be built in only one type of building
     def __init__(self):
         self.building = defaultdict(None, {

aoe/world.py

@@ -166,7 +166,7 @@ class World():
             raise IllegalVillagerMoveException
 
         if new_task:
-            self._check_gather(new_task, count)
+            self.gather.check_gather(self, new_task, count)
             self.villager_tasks[new_task] += count
         else:
             self.villagers -= 1
@@ -291,24 +291,25 @@ class World():
             self._handle_events()
 
 
-    def _get_population_space(self):
+    def get_population_space(self):
         space = sum([self.housing.space[building] for building in self.buildings])
         return min(space, 200)
 
 
-    def _get_effective_population(self):
+    def get_effective_population(self):
         return self.population + self.units_being_built
 
 
     def _free_housing(self):
-        pop_space = self._get_population_space()
+        pop_space = self.get_population_space()
 
         i = 0
-        while (self._get_effective_population() < pop_space and
+        while (self.get_effective_population() < pop_space and
                i < len(self.production_queue)):
 
             thing = self.production_queue[i]
-            if self._check_housing(thing) and self._check_production(thing):
+            if self.housing.check_housing(self, thing) and \
+                    self.production.check_production(self, thing):
                 self._start_producing(thing)
                 del self.production_queue[i]
             else:
@@ -338,41 +339,9 @@ class World():
             self._start_producing(thing)
 
 
-    def _check_gather(self, task, count=1):
-        if task in [Tasks.IDLE, Tasks.BUILD]:
-            return
-
-        required = self.gather.required_gather_buildings[task]
-        have = set(self.buildings)
-
-        match = any(map(have.issuperset, required))
-
-        if not match:
-            raise GatherBuildingNotAvailableException
-
-        if task == task.FARM:
-            if self.villager_tasks[task] + count > len(self.unused_farms):
-                raise GatherBuildingNotAvailableException
-
-
-    def _check_housing(self, thing):
-        required = self.housing.required[thing]
-
-        if required > 0:
-            pop_space = self._get_population_space()
-            if self._get_effective_population() > pop_space + required:
-                raise YallGotHousedException
-
-
-    def _check_production(self, unit):
-        building = self.production.building[unit]
-        if self.production_available[building] < 1:
-            raise ProductionBuildingNotAvailableException
-
-
     def _use_housing_and_production(self, thing):
-        self._check_housing(thing)
-        self._check_production(thing)
+        self.housing.check_housing(self, thing)
+        self.production.check_production(self, thing)
 
         building = self.production.building[thing]
         if building is not None: