From bc47a4c3efe6006b42f1a4925a0994dc3e5093d1 Mon Sep 17 00:00:00 2001
From: Peter Ward <peteraward@gmail.com>
Date: Mon, 28 Sep 2009 12:17:22 +1000
Subject: Added a compatibility layer for Gregsnakebots.

---
 oldbots/peter.py | 83 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 83 insertions(+)
 create mode 100755 oldbots/peter.py

(limited to 'oldbots')

diff --git a/oldbots/peter.py b/oldbots/peter.py
new file mode 100755
index 0000000..72bbc95
--- /dev/null
+++ b/oldbots/peter.py
@@ -0,0 +1,83 @@
+#!/usr/bin/env python
+"""New and improved bot, OPTIMISED!!"""
+
+import random
+import sys
+
+EMPTY_TILE = '.'
+APPLE_TILE = '*'
+
+WIDTH, HEIGHT, SNAKE_BODY = raw_input().split()
+WIDTH = int(HEIGHT)
+HEIGHT = int(HEIGHT)
+
+SNAKE_BODY = SNAKE_BODY.lower()
+SNAKE_HEAD = SNAKE_BODY.upper()
+
+HEADX = None
+HEADY = None
+
+def get_cell(board, x, y):
+    if x < 0 or x >= WIDTH or y < 0 or y >= HEIGHT:
+        raise KeyError, 'out of range.'
+    return board[y][x]
+
+BOARD = []
+for y in xrange(HEIGHT):
+    row = raw_input()
+    for x, char in enumerate(row):
+        if char == SNAKE_HEAD:
+            HEADX = x
+            HEADY = y
+    BOARD.append(row)
+
+md_two = {
+    (-1, 0, 'l'): ((-2, 0), (-1, 1), (-1, -1)),
+    (0, -1, 'u'): ((-1, -1), (1, -1), (0, -2)),
+    (1, 0, 'r'): ((2, 0), (1, 1), (1, -1)),
+    (0, 1, 'd'): (((0, 2), (-1, 1), (1, 1))),
+}
+
+max_score = 0
+max_moves = []
+
+for (dx, dy, move), adj in md_two.items():
+    score = 0
+
+    try:
+        square = get_cell(BOARD, HEADX + dx, HEADY + dy)
+    except KeyError:
+        continue
+
+    if square == APPLE_TILE:
+        score += 2
+    elif square != EMPTY_TILE:
+        continue # Definitely cannot move here.
+
+    for ddx, ddy in adj:
+        try:
+            square = get_cell(BOARD, HEADX + ddx, HEADY + ddy)
+        except KeyError:
+            score -= 1
+            continue
+
+        if square == APPLE_TILE:
+            score += 2
+        elif square == EMPTY_TILE:
+            score += 1
+        elif square == SNAKE_BODY:
+            score -= 1
+        elif square.isupper():
+            score += 3
+
+    if score == max_score:
+        max_moves.append(move)
+    elif score > max_score:
+        max_score = score
+        max_moves = [move]
+
+if max_moves:
+    print random.choice(max_moves)
+else:
+    print 'U' # Suicide!
+
-- 
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