Mercurial > fife-parpg

comparison engine/python/fife/extensions/pychan/attrs.py @ 378:64738befdf3b

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bringing in the changes from the build_system_rework branch in preparation for the 0.3.0 release. This commit will require the Jan2010 devkit. Clients will also need to be modified to the new way to import fife.
author vtchill@33b003aa-7bff-0310-803a-e67f0ece8222
date Mon, 11 Jan 2010 23:34:52 +0000
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children d90526c3918b
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377:fe6fb0e0ed23 378:64738befdf3b
1 # -*- coding: utf-8 -*-
2
3 # ####################################################################
4 # Copyright (C) 2005-2009 by the FIFE team
5 # http://www.fifengine.de
6 # This file is part of FIFE.
7 #
8 # FIFE is free software; you can redistribute it and/or
9 # modify it under the terms of the GNU Lesser General Public
10 # License as published by the Free Software Foundation; either
11 # version 2.1 of the License, or (at your option) any later version.
12 #
13 # This library is distributed in the hope that it will be useful,
14 # but WITHOUT ANY WARRANTY; without even the implied warranty of
15 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 # Lesser General Public License for more details.
17 #
18 # You should have received a copy of the GNU Lesser General Public
19 # License along with this library; if not, write to the
20 # Free Software Foundation, Inc.,
21 # 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 # ####################################################################
23
24 """
25 Simple error checking attributes.
26
27 This module defines a set of Attribute classes
28 which you can use to define possible values
29 an attribute of an object accepts.
30
31 Usage::
32 class SomeObject:
33 nameAttr, posAttr = [ Attr("name"), PointAttr("pos") ]
34
35 obj = SomeObject()
36 obj.nameAttr.set(obj,"newName")
37 obj.posAttr.set(obj,"89,89")
38
39 This is most useful for error checking parsing and defining
40 accepted attributes in classes and is used by pychan internally.
41
42 """
43
44 from exceptions import ParserError
45
46 class Attr(object):
47 """
48 A simple text attribute.
49 """
50 def __init__(self,name):
51 self.name = name
52
53 def set(self,obj,value):
54 """
55 Parses the given value with the L{parse} method
56 and sets it on the given instance with C{setattr}.
57 """
58 value = self.parse(value)
59 setattr(obj,self.name,value)
60
61 def parse(self,value):
62 """
63 Parses a value and checks for errors.
64 Override with specialiced behaviour.
65 """
66 return str(value)
67
68 class UnicodeAttr(Attr):
69 def parse(self,value):
70 """
71 Parses a value and checks for errors.
72 Override with specialiced behaviour.
73 """
74 return unicode(value)
75
76
77 class PointAttr(Attr):
78 def parse(self,value):
79 try:
80 x,y = tuple(map(int,str(value).split(',')))
81 return x,y
82 except:
83 raise ParserError("Expected a comma separated list of two integers.")
84
85 class ColorAttr(Attr):
86 def parse(self,value):
87 a = 255
88 try:
89 try:
90 r,g,b,a = tuple(map(int,str(value).split(',')))
91 for c in (r,g,b,a):
92 if not 0 <= c < 256: raise ParserError("Expected a color (Failed: 0 <= %d <= 255)" %c)
93 except:
94 r,g,b = tuple(map(int,str(value).split(',')))
95 for c in (r,g,b):
96 if not 0 <= c < 256: raise ParserError("Expected a color (Failed: 0 <= %d <= 255)" %c)
97 except:
98 raise ParserError("Expected an color.")
99
100 return r,g,b,a
101
102 class IntAttr(Attr):
103 def parse(self,value):
104 try:
105 return int(value)
106 except:
107 raise ParserError("Expected a single integer.")
108
109 class BoolAttr(Attr):
110 def parse(self,value):
111 try:
112 value = int(value)
113 if value not in (0,1):
114 raise ParserError("Expected a 0 or 1.")
115 return value
116 except:
117 raise ParserError("Expected a 0 or 1.")
118
119 class FloatAttr(Attr):
120 def parse(self, value):
121 try:
122 return float(value)
123 except:
124 raise ParseError("Expected a float.")