作者：杨超
本文地址：http://sokoban.ws/blog/?p=729
半年前用Python写了一个推箱子的lurd2xsb小程序。昨晚好奇为了了解Python建站技术，在https://www.pythonanywhere.com申请了一个帐号。
然后今天研究了大半天，终于成功把之前的lurd2xsb通过web.py框架，稍作修改，成功地作为一个web程序运行。本来技术上没有什么困难，但是排除缩进引起的错误花了我很长时间。程序原有的Sokoban类的代码一个字符未动，只是输入输出方式有所改变。
通过web.py框架用Python写web程序，和php很不大一样。
最后这个lurd2xsb网页程序地址是：http://sokoban.pythonanywhere.com/。在这个地址斜杆后接lurd串访问，便在返回页面中显示还原的xsb格式关卡。比如这个链接。
全部代码如下：
import web
class Sokoban:
def __init__(self):
self.level = "####@####"
self.w=3
self.h=3
self.man=4
def __str__(self):
temp = ""
for i in range(0,self.h):
temp += self.level[i*self.w : (i+1)*self.w] + "\n"
temp += "size: " + str(self.w) + "x" + str(self.h)
temp += "\nman: " + str(self.man)
return temp
def add_row(self,l):
if l==1:
for i in range(0,self.w):
self.level = self.level + "#"
elif l==0:
for i in range(0,self.w):
self.level = "#" + self.level
self.man += self.w
self.h+=1
def add_column(self,l):
if l==1:
self.man += (self.man / self.w)
for i in range(0,self.h):
self.level = self.level[0:self.w * (self.h -i)] + "#" + self.level[self.w * (self.h -i):]
elif l==0:
self.man += ( self.man / self.w + 1 )
for i in range(0,self.h):
self.level = self.level[0:self.w * (self.h - 1 - i)] + "#" + self.level[self.w * (self.h - 1 - i):]
self.w+=1
def undo(self,step):
#prepare
if step == 'l' or step == 'L':
d = -1
elif step == 'r' or step == 'R':
d = 1
elif step == 'u' or step == 'U':
d = -1 * self.w
elif step == 'd' or step == 'D':
d = self.w
else:
return
#action
if self.level[ self.man - d] == '$' or self.level[ self.man - d] == '*':
exit("invalid input lurd string![0]")
elif step == 'l' or step == 'u' or step == 'r' or step == 'd': #undo a move
if self.level[ self.man] == '@':
floor = ' '
else:
floor = '.'
if self.level[ self.man - d ] == '.':
pusher = '+'
else:
pusher = '@'
self.level = self.level[0:self.man] + floor + self.level[ self.man +1:]
self.level = self.level[0:self.man - d ] + pusher + self.level[self.man - d + 1:]
self.man -= d
elif step == 'L' or step == 'U' or step == 'R' or step == 'D': #undo a push
if self.level[ self.man] == '@':
box = '$'
else:
box = '*'
if self.level[ self.man - d ] == '.':
pusher = '+'
else:
pusher = '@'
if self.level[ self.man + d ] == '*' or self.level[ self.man + d ] == '#':
floor = '.'
elif self.level[ self.man + d ] == '$':
floor = ' '
else:
exit("invalid input lurd string![1]")
self.level = self.level[0:self.man] + box + self.level[ self.man +1:]
self.level = self.level[0:self.man - d ] + pusher + self.level[self.man - d + 1:]
self.level = self.level[0:self.man + d ] + floor + self.level[self.man + d + 1:]
self.man -= d
#post action
if self.man % self.w == self.w -1:
self.add_column(1)
elif self.man % self.w ==0:
self.add_column(0)
elif self.man < self.w:
self.add_row(0)
elif self.man >= (self.h - 1 )* self.w:
self.add_row(1)
#post action 2
if '.' in self.level[0:self.w]:
self.add_row(0)
elif '.' in self.level[(self.h-1)*self.w : self.h*self.w]:
self.add_row(1)
else:
for i in range(0,self.h):
if self.level[i*self.w]=='.':
self.add_column(0)
break
elif self.level[i*self.w + self.w -1]=='.':
self.add_column(1)
break
urls = (
'/(.*)', 'index'
)
class index:
def GET(self,lurd):
web.header('Content-Type','text/html; charset=utf-8', unique=True)
skb = Sokoban()
for step in lurd[::-1]:
try:
skb.undo(step)
except SystemExit, msg:
return """
<html>
<head>
<title>lurd2xsb in Python</title>
</head>
<body>
<h1>lurd2xsb in Python</h1>
<pre>""" + 'Invalid lurd string!' + """ </pre><hr>
<i>Created on Oct. 31, 2012</i> by <a target="_blank" href="http://sokoban.ws">http://sokoban.ws</a>
</body></html>"""
return """
<html>
<head>
<title>lurd2xsb in Python</title>
</head>
<body>
<h1>lurd2xsb in Python</h1>
<pre>""" + skb.__str__() + """ </pre><hr>
<i>Created on Oct. 31, 2012</i> by <a target="_blank" href="http://sokoban.ws">http://sokoban.ws</a>
</body></html>"""
app = web.application(urls, globals())
application = app.wsgifunc()