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annotate engine/extensions/pychan/attrs.py @ 122:6b2f3a151f81

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* Small fixes (window icon, additional resolutions, svn:ignore)
author mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
date Tue, 05 Aug 2008 14:56:54 +0000
parents 4a0efb7baf70
children ec653fde64d3
rev   line source
0
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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1 # coding: utf-8
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2
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3 """
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4 Simple error checking attributes.
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5
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6 This module defines a set of Attribute classes
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7 which you can use to define possible values
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8 an attribute of an object accepts.
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9
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10 Usage::
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11 class SomeObject:
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12 nameAttr, posAttr = [ Attr("name"), PointAttr("pos") ]
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13
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14 obj = SomeObject()
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15 obj.nameAttr.set(obj,"newName")
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16 obj.posAttr.set(obj,"89,89")
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17
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18 This is most useful for error checking parsing and defining
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19 accepted attributes in classes and is used by pychan internally.
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20
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21 """
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22
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23 from exceptions import ParserError
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24
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25 class Attr(object):
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26 """
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27 A simple text attribute.
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28 """
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29 def __init__(self,name):
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30 self.name = name
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31
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32 def set(self,obj,value):
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33 """
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34 Parses the given value with the L{parse} method
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35 and sets it on the given instance with C{setattr}.
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36 """
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37 value = self.parse(value)
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38 setattr(obj,self.name,value)
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39
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40 def parse(self,value):
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41 """
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42 Parses a value and checks for errors.
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43 Override with specialiced behaviour.
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44 """
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45 return str(value)
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46
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47 class PointAttr(Attr):
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48 def parse(self,value):
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49 try:
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50 x,y = tuple(map(int,str(value).split(',')))
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51 return x,y
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52 except:
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53 raise ParserError("Expected a comma separated list of two integers.")
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54
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55 class ColorAttr(Attr):
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56 def parse(self,value):
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57 try:
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58 r,g,b = tuple(map(int,str(value).split(',')))
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59 except:
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60 raise ParserError("Expected an color.")
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61 for c in (r,g,b):
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62 if not 0 <= c < 256: raise ParserError("Expected a color (Failed: 0 <= %d <= 255)" %c)
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63 return r,g,b
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64
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65 class IntAttr(Attr):
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66 def parse(self,value):
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67 try:
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68 return int(value)
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69 except:
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70 raise ParserError("Expected a single integer.")
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71
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72 class BoolAttr(Attr):
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73 def parse(self,value):
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74 try:
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75 value = int(value)
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76 if value not in (0,1):
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77 raise ParserError("Expected a 0 or 1.")
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78 return value
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79 except:
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80 raise ParserError("Expected a 0 or 1.")