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#!/usr/bin/env python
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__author__ = "Ira W. Snyder (devel@irasnyder.com)"
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__copyright__ = "Copyright (c) 2006, Ira W. Snyder (devel@irasnyder.com)"
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__license__ = "GNU GPL v2 (or, at your option, any later version)"
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from PyCompat import *
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from Actions import *
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import sys
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(WALK, PUSH, CLIMB, GRAB) = ('Walk', 'Push', 'Climb', 'Grab')
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def findNextMove (State):
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"""Prioritized Search for the best next move"""
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monkeyPosition = Action(State).findMonkeyPosition ()
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boxPosition = Action(State).findBoxPosition ()
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# Try to Grab
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if Grab(State).meetsPreconditions():
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return (GRAB,)
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# Try to push box to middle
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if Push(State, boxPosition, Push.MIDDLE).meetsPreconditions():
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if boxPosition != Push.MIDDLE:
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return (PUSH, boxPosition, Push.MIDDLE)
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# Try to walk to box
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if Walk(State, monkeyPosition, boxPosition).meetsPreconditions():
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if monkeyPosition != boxPosition:
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return (WALK, monkeyPosition, boxPosition)
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# Try to climb the box
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if Climb(State, Climb.UP).meetsPreconditions():
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if not Action(State).monkeyOnBox ():
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return (CLIMB, Climb.UP)
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# Try to climb down from the box
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if Climb(State, Climb.DOWN).meetsPreconditions():
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if Action(State).monkeyOnBox ():
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return (CLIMB, Climb.DOWN)
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def isValidInitialState (State):
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monkeyPos = Action(State).findMonkeyPosition()
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boxPos = Action(State).findBoxPosition()
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onBox = Action(State).monkeyOnBox()
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if onBox and (monkeyPos != boxPos):
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return False
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return True
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def main ():
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#State = set(['At(Monkey,Door)', 'At(Box,Window)', 'OnFloor()', 'NoBanana()'])
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State = set(['At(Monkey,Middle)', 'At(Box,Window)', 'OnFloor()', 'NoBanana()'])
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#State = set(['At(Monkey,Window)', 'At(Box,Window)', 'OnFloor()', 'NoBanana()'])
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#State = set(['At(Monkey,Window)', 'At(Box,Window)', 'OnBox()', 'NoBanana()'])
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#State = set(['At(Monkey,Window)', 'At(Box,Window)', 'OnBox()', 'HasBanana()'])
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#State = set(['At(Monkey,Door)', 'At(Box,Window)', 'OnBox()', 'HasBanana()'])
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#State = set(['At(Monkey,Window)', 'At(Box,Middle)', 'OnFloor()', 'NoBanana()'])
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#State = set(['At(Monkey,Door)', 'At(Box,Middle)', 'OnFloor()', 'NoBanana()'])
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#State = set(['At(Monkey,Middle)', 'At(Box,Middle)', 'OnFloor()', 'NoBanana()'])
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#State = set(['At(Monkey,Middle)', 'At(Box,Middle)', 'OnBox()', 'NoBanana()'])
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#State = set(['At(Monkey,Middle)', 'At(Box,Door)', 'OnFloor()', 'NoBanana()'])
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if not isValidInitialState (State):
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print 'Bad initial state'
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sys.exit (1)
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while not Action(State).isGoal():
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next = findNextMove (State)
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action = next[0]
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if action == WALK:
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print '%s from %s to %s' % next
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State = Walk(State, next[1], next[2]).takeAction()
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elif action == PUSH:
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print '%s from %s to %s' % next
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State = Push(State, next[1], next[2]).takeAction()
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elif action == CLIMB:
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print '%s %s' % next
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State = Climb(State, next[1]).takeAction()
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elif action == GRAB:
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print '%s Banana' % next
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State = Grab(State).takeAction()
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else:
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print 'BAD STATE'
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sys.exit (2)
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print 'Reached the Goal!'
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if __name__ == '__main__':
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main ()
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# vim: set ts=4 sts=4 sw=4:
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