From e79b9d20d676da24dc466d1eed7d33598de5abab Mon Sep 17 00:00:00 2001
From: Niels Serup <ns@metanohi.name>
Date: Wed, 8 Aug 2012 11:53:16 +0200
Subject: [PATCH] Change name Stone to more abstract Blocker.

---
 robotgame/logic/rollingstone.py | 15 ++++++---------
 tests/rollingstone_tests.py     |  6 +++---
 2 files changed, 9 insertions(+), 12 deletions(-)

diff --git a/robotgame/logic/rollingstone.py b/robotgame/logic/rollingstone.py
index 336b342..35f2859 100644
--- a/robotgame/logic/rollingstone.py
+++ b/robotgame/logic/rollingstone.py
@@ -34,10 +34,7 @@ import itertools
 from robotgame.logic.direction import *
 import random
 
-class RollingStoneError(Exception):
-    pass
-
-class Stone(object):
+class Blocker(object):
     pass
 
 def step(playfield, width, height, old_pos, direc):
@@ -47,7 +44,7 @@ def step(playfield, width, height, old_pos, direc):
     """
     pos = direc.next_pos(old_pos)
     x, y = pos
-    if playfield.get(pos) is Stone or x < 0 or x >= width \
+    if playfield.get(pos) is Blocker or x < 0 or x >= width \
             or y < 0 or y >= height:
         pos = old_pos
     elif isDirection(playfield.get(pos)):
@@ -81,7 +78,7 @@ def generate_simple_playfield(width, height, nturns, nstones):
       * the playfield is completable in nturns or less
       * the playfield has at most nstones stones
 
-    Return (playfield : {(x, y): Direction | Stone},
+    Return (playfield : {(x, y): Direction | Blocker},
             steps : int)
     where (x, y) : (int, int)
 
@@ -151,7 +148,7 @@ def generate_simple_playfield(width, height, nturns, nstones):
             break
         pos = random.choice(list(emptys))
         emptys.remove(pos)
-        playfield[pos] = Stone
+        playfield[pos] = Blocker
     return playfield, len(used_fields) - 1
 
 def generate_simple_unsolved_solvable_playfield(width, height, nturns, nstones):
@@ -162,7 +159,7 @@ def generate_simple_unsolved_solvable_playfield(width, height, nturns, nstones):
     playfield = generate_simple_playfield(width, height, nturns, stones)
     new_playfield, directions = {}, []
     for pos, val in playfield.items():
-        if val is Stone:
+        if val is Blocker:
             new_playfield[pos] = val
         else:
             directions.append(val)
@@ -184,7 +181,7 @@ def print_playfield(playfield, width, height, hide_directions):
     for (x, y), val in playfield.items():
         if isDirection(val) and hide_directions:
             continue
-        text[y][x] = '%' if val == Stone else repr(val).rsplit('.', 1)[1][0] \
+        text[y][x] = '%' if val == Blocker else repr(val).rsplit('.', 1)[1][0] \
             if isDirection(val) else 'G'
     print('\n'.join(''.join(line) for line in text))
 
diff --git a/tests/rollingstone_tests.py b/tests/rollingstone_tests.py
index 172d84b..ec94472 100644
--- a/tests/rollingstone_tests.py
+++ b/tests/rollingstone_tests.py
@@ -10,15 +10,15 @@ class RollingStoneTest(unittest.TestCase):
         playfield_example_succeed = {
             (0, 0): Down,
             (0, 2): Right,
-            (1, 3): Stone,
-            (2, 1): Stone,
+            (1, 3): Blocker,
+            (2, 1): Blocker,
             (2, 2): Down,
             (2, 3): Right,
             }
         self.assertTrue(reaches_goal(playfield_example_succeed,
                                      4, 4, 100, (0, 0), (3, 3)))
 
-        playfield_example_succeed[(1, 2)] = Stone
+        playfield_example_succeed[(1, 2)] = Blocker
         self.assertFalse(reaches_goal(playfield_example_succeed,
                                       4, 4, 100, (0, 0), (3, 3)))