Mercurial > rinkhals

annotate gamelib/serializer.py @ 520:3e19a7f5333e

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Tweak controls dialog
author Neil Muller <drnlmuller@gmail.com>
date Fri, 27 Nov 2009 14:01:29 +0000
parents 3ed6c011106d
children 03be16420e8b
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1 """
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2 Interface for converting objects to and from simple structures: lists, dicts,
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3 strings, integers and combinations there of. Used for sending objects over
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4 the communications API.
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5 """
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6
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7 REGISTERED_CLASSES = {}
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8
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9 def simplify(item, refs=None):
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10 """Convert an item to a simple data structure."""
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11 if refs is None:
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12 refs = set()
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13
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14 refid = str(id(item))
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15
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16 if refid in refs:
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17 return { 'byref': refid }
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18
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19 if issubclass(type(item), Simplifiable):
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20 refs.add(refid)
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21 value = item.simplify(refs)
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22 value['refid'] = refid
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23 elif type(item) is list:
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24 refs.add(refid)
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25 value = { 'list': [simplify(x, refs) for x in item] }
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26 value['refid'] = refid
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27 elif type(item) is set:
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28 refs.add(refid)
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29 value = { 'set': [simplify(x, refs) for x in item] }
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30 value['refid'] = refid
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31 elif type(item) is tuple:
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32 refs.add(refid)
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33 value = { 'tuple': tuple([simplify(x, refs) for x in item]) }
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34 value['refid'] = refid
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35 elif item is None:
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36 value = { 'none': '' }
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37 else:
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38 value = { 'raw': item }
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39
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40 return value
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41
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42 def unsimplify(value, refs=None):
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43 """Reverse the simplify process."""
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44 if refs is None:
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45 refs = {}
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46
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47 if 'refid' in value:
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48 refid = value['refid']
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49
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50 if value.has_key('class'):
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51 cls = REGISTERED_CLASSES[value['class']]
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52 item = cls.unsimplify(value, refs)
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53 elif value.has_key('list'):
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54 item = []
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55 refs[refid] = item
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56 item.extend(unsimplify(x, refs) for x in value['list'])
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57 elif value.has_key('set'):
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58 item = set()
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59 refs[refid] = item
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60 item.update(unsimplify(x, refs) for x in value['set'])
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61 elif value.has_key('tuple'):
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62 item = tuple([unsimplify(x, refs) for x in value['tuple']])
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63 elif value.has_key('none'):
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64 item = None
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65 elif value.has_key('raw'):
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66 item = value['raw']
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67 elif value.has_key('byref'):
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68 refid = value['byref']
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69 if refid in refs:
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70 item = refs[refid]
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71 else:
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72 raise SimplifyError("Unknown refid %r in byref." % (refid,))
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73 else:
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74 raise SimplifyError("Unknown unsimplify type key.")
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75
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76 if 'refid' in value:
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77 refs[value['refid']] = item
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78
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79 return item
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80
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81 class SimplifyError(Exception):
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82 pass
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83
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84 class SimplifiableMetaclass(type):
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85 def __init__(cls, name, bases, dct):
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86 super(SimplifiableMetaclass, cls).__init__(name, bases, dct)
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87 REGISTERED_CLASSES[cls.__name__] = cls
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88
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89 class Simplifiable(object):
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90 """
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91 Object which can be simplified() and unsimplified() (i.e.
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92 converted to a data type which, for example, Python's XMLRPC
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93 or json module is capable of handling). Each subclass
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94 must provide SIMPLIFY (a list of strings giving the names
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95 of attributes which should be stored) unless a parent class
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96 provides the right thing.
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97 """
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98 __metaclass__ = SimplifiableMetaclass
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99
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100 # List of attributes which need to be stored and restored
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101 SIMPLIFY = []
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102
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103 @classmethod
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104 def make(cls):
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105 """
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106 Create an object of this class without any attributes set.
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107 """
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108 return cls.__new__(cls)
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109
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110 @classmethod
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111 def unsimplify(cls, value, refs=None):
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112 """
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113 Create an object of this class (or a sub-class) from its
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114 simplification.
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115 """
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116 actual_cls = REGISTERED_CLASSES[value['class']]
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117 attrs = value['attributes']
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118
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119 if not issubclass(actual_cls, cls):
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120 raise SimplifyError("Actual class (%r) not a subclass of"
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121 " this class (%r)" % (actual_cls, cls))
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122
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123 if not len(attrs) == len(actual_cls.SIMPLIFY):
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124 raise SimplifyError("Wrong number of attributes for this"
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125 " class (%r)" % (actual_cls,))
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126
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127 obj = actual_cls.make()
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128 refs[value['refid']] = obj
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129
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130 for attr, value in zip(actual_cls.SIMPLIFY, attrs):
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131 setattr(obj, attr, unsimplify(value, refs))
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132
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133 return obj
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134
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135 def simplify(self, refs=None):
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136 """
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137 Create a simplified version (tar) of the object.
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138 """
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139 value = {}
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140 value['class'] = self.__class__.__name__
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141
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142 attrs = []
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143 for attr in self.SIMPLIFY:
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144 o = getattr(self, attr)
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145 attrs.append(simplify(o, refs))
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146
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147 value['attributes'] = attrs
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148 return value
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149
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150 def copy(self):
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151 """
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152 Return a copy of the object.
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153 """
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154 return self.__class__.unsimplify(self.simplify())