Mercurial > MadButterfly

annotate pyink/trait.py @ 1381:9a585df24e52

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Consider the width and height attribute for the rect elements. The inkscape will change the width and height directly without using transform when we resize the rectangle.
author wycc
date Wed, 23 Mar 2011 23:02:36 +0800
parents 1a4d15fe2c62
children 28769a82a72d
rev   line source
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1 ## \brief Implement descriptors for mapping attributes for traits.
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2 #
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3 # The instances of require map attributes of traits to corresponding
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4 # attributes of the instance of the composition class.
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5 #
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6 class require(object):
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7 def __init__(self, trait_clazz):
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8 self.trait_clazz = trait_clazz
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9 pass
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10
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11 def __get__(self, instance, owner):
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12 if not instance: # from a class object
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13 return self
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14
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15 attrname = instance._trait_attrname_map[self]
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16 composite_obj = instance._trait_composite_obj
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17 val = getattr(composite_obj, attrname)
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18 return val
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19
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20 def __set__(self, instance, value):
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21 attrname = instance._trait_attrname_map[self]
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22 composite_obj = instance._trait_composite_obj
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23 setattr(composite_obj, attrname, value)
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24 pass
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25 pass
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26
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27
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28 ## \brief Decorator for making a class being a trait.
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29 #
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30 def trait(trait_clazz):
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31 attrname_map = {}
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32 trait_clazz._trait_attrname_map = attrname_map
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33
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34 for attr in dir(trait_clazz):
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35 value = getattr(trait_clazz, attr)
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36 if value != require:
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37 continue
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38
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39 require_o = require(trait_clazz)
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40 setattr(trait_clazz, attr, require_o)
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41 attrname_map[require_o] = attr
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42 pass
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43
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44 trait_clazz._is_trait = True
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45
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46 return trait_clazz
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47
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48
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49 ## \brief The function to return a proxy for a method of a trait.
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50 #
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51 def trait_method_proxy(trait_clazz, method):
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52 def trait_method_proxy_real(self, *args, **kws):
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53 if not hasattr(self, '_all_trait_objs'):
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54 # self is an instance of the class composed from traits.
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55 self._all_trait_objs = {}
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56 pass
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57
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58 try:
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59 trait_obj = self._all_trait_objs[trait_clazz]
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60 except KeyError:
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61 trait_obj = trait_clazz()
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62 trait_obj._trait_composite_obj = self
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63 self._all_trait_objs[trait_clazz] = trait_obj
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64 pass
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65
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66 r = method(trait_obj, *args, **kws)
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67
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68 return r
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69
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70 return trait_method_proxy_real
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71
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72
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73 ## \brief Derive and modify an existing trait.
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74 #
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75 def derive_trait(a_trait, composite_clazz):
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76 #
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77 # Set a map mamping requires to attribute names.
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78 #
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79 # Search provide_traits for requires of a_trait, and patch
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80 # attrname_map for it.
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81 #
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82 attrname_map = None
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83 if hasattr(composite_clazz, 'provide_traits'):
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84 provide_traits = composite_clazz.provide_traits
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85 attrname_map = dict(a_trait._trait_attrname_map)
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86 for req in provide_traits:
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87 if req.trait_clazz == a_trait:
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88 attrname_map[req] = provide_traits[req]
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89 pass
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90 pass
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91 pass
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92
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93 dic = {}
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94 if attrname_map:
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95 dic['_trait_attrname_map'] = attrname_map
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96 pass
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97
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98 derived = type('derived_trait', (a_trait,), dic)
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99
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100 return derived
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101
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aaa88d805aac Refactory composite() to smaller functions
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102
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103 ## \brief Check explicity providing for requires.
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104 #
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105 # Composite maps require attributes of traits to the attribute, with
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106 # the same name, of composition class by default. But, composition
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107 # class can specify name of the attribute that will satisfy a require.
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108 #
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109 def _check_provide_traits(clazz):
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110 traits = clazz.use_traits
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111
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112 #
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113 # Check content of clazz.provide_traits
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114 #
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115 if hasattr(clazz, 'provide_traits'):
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116 if not isinstance(clazz.provide_traits, dict):
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117 raise TypeError, \
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118 'provide_traits of a composite must be a dictionary'
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119
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120 provide_set = set([req.trait_clazz
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121 for req in clazz.provide_traits.keys()])
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122 trait_set = set(traits)
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123 unused_set = provide_set - trait_set
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124 if unused_set:
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125 raise ValueError, \
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126 'can not find %s in provide_traits' % (repr(unused_set.pop()))
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127
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128 for req in clazz.provide_traits:
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129 if not isinstance(req, require):
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130 raise TypeError, \
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131 '%s is not a require: key of an ' \
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132 'attribute name map must be a require' % (repr(req))
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133 pass
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134 pass
1347
aaa88d805aac Refactory composite() to smaller functions
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parents: 1346
diff changeset
135 pass
aaa88d805aac Refactory composite() to smaller functions
Thinker K.F. Li <thinker@codemud.net>
parents: 1346
diff changeset
136
aaa88d805aac Refactory composite() to smaller functions
Thinker K.F. Li <thinker@codemud.net>
parents: 1346
diff changeset
137
aaa88d805aac Refactory composite() to smaller functions
Thinker K.F. Li <thinker@codemud.net>
parents: 1346
diff changeset
138 ## \brief Include methods from trait for a composition class.
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Thinker K.F. Li <thinker@codemud.net>
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diff changeset
139 #
aaa88d805aac Refactory composite() to smaller functions
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diff changeset
140 def _include_methods(clazz):
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diff changeset
141 traits = clazz.use_traits
1345
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parents:
diff changeset
142
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parents:
diff changeset
143 #
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144 # Count number of appearing in all traits for every attribute name.
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parents:
diff changeset
145 #
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parents:
diff changeset
146 attrname_cnts = {}
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parents:
diff changeset
147 for a_trait in traits:
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parents:
diff changeset
148 for attr in dir(a_trait):
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parents:
diff changeset
149 if attr.startswith('_'):
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parents:
diff changeset
150 continue
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parents:
diff changeset
151
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diff changeset
152 value = getattr(a_trait, attr)
1351
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diff changeset
153 if isinstance(value, require) or not callable(value):
1345
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parents:
diff changeset
154 continue
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diff changeset
155
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parents:
diff changeset
156 attrname_cnts[attr] = attrname_cnts.setdefault(attr, 0) + 1
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parents:
diff changeset
157 pass
e0400a2b7c35 Use trait instead of mixin for component_manager
Thinker K.F. Li <thinker@codemud.net>
parents:
diff changeset
158 pass
e0400a2b7c35 Use trait instead of mixin for component_manager
Thinker K.F. Li <thinker@codemud.net>
parents:
diff changeset
159
e0400a2b7c35 Use trait instead of mixin for component_manager
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parents:
diff changeset
160 if hasattr(clazz, 'method_map_traits'):
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Thinker K.F. Li <thinker@codemud.net>
parents:
diff changeset
161 method_map_traits = clazz.method_map_traits
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Thinker K.F. Li <thinker@codemud.net>
parents:
diff changeset
162 else:
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parents:
diff changeset
163 method_map_traits = {}
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parents:
diff changeset
164 pass
e0400a2b7c35 Use trait instead of mixin for component_manager
Thinker K.F. Li <thinker@codemud.net>
parents:
diff changeset
165
e0400a2b7c35 Use trait instead of mixin for component_manager
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parents:
diff changeset
166 #
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167 # Set a proxy for every exported methods.
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parents:
diff changeset
168 #
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parents:
diff changeset
169 derived_traits = clazz._derived_traits = {}
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parents:
diff changeset
170 for a_trait in traits:
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parents:
diff changeset
171 derived = derive_trait(a_trait, clazz)
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parents:
diff changeset
172 derived_traits[a_trait] = derived
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parents:
diff changeset
173
e0400a2b7c35 Use trait instead of mixin for component_manager
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parents:
diff changeset
174 for attr in dir(derived):
e0400a2b7c35 Use trait instead of mixin for component_manager
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parents:
diff changeset
175 if attr not in attrname_cnts: # hidden
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Thinker K.F. Li <thinker@codemud.net>
parents:
diff changeset
176 continue
e0400a2b7c35 Use trait instead of mixin for component_manager
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diff changeset
177 if attrname_cnts[attr] > 1: # conflict
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Thinker K.F. Li <thinker@codemud.net>
parents:
diff changeset
178 continue
e0400a2b7c35 Use trait instead of mixin for component_manager
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parents:
diff changeset
179
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diff changeset
180 if hasattr(clazz, attr): # override
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parents:
diff changeset
181 continue
e0400a2b7c35 Use trait instead of mixin for component_manager
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parents:
diff changeset
182
e0400a2b7c35 Use trait instead of mixin for component_manager
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parents:
diff changeset
183 value = getattr(a_trait, attr)
1348
22a79dcbaec6 Change structure of provide_traits and method_map_traits
Thinker K.F. Li <thinker@codemud.net>
parents: 1347
diff changeset
184 if value in method_map_traits: # do it later
1345
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Thinker K.F. Li <thinker@codemud.net>
parents:
diff changeset
185 continue
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diff changeset
186
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diff changeset
187 value = getattr(derived, attr)
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diff changeset
188
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189 if not callable(value):
1351
1a4d15fe2c62 Fix the issue for name confliction between two used traits.
Thinker K.F. Li <thinker@codemud.net>
parents: 1349
diff changeset
190 continue
1345
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191
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192 func = value.im_func
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193 proxy = trait_method_proxy(derived, func)
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diff changeset
194 setattr(clazz, attr, proxy)
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195 pass
e0400a2b7c35 Use trait instead of mixin for component_manager
Thinker K.F. Li <thinker@codemud.net>
parents:
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196 pass
e0400a2b7c35 Use trait instead of mixin for component_manager
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parents:
diff changeset
197
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198 #
1348
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199 # Set a proxy for methods specified in method_map_traits.
1345
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200 #
1348
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diff changeset
201 for method, attrname in method_map_traits.items():
22a79dcbaec6 Change structure of provide_traits and method_map_traits
Thinker K.F. Li <thinker@codemud.net>
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diff changeset
202 if not callable(method):
22a79dcbaec6 Change structure of provide_traits and method_map_traits
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diff changeset
203 raise TypeError, \
22a79dcbaec6 Change structure of provide_traits and method_map_traits
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diff changeset
204 '%s.%s is not a callable' % (repr(a_trait), repr(method))
22a79dcbaec6 Change structure of provide_traits and method_map_traits
Thinker K.F. Li <thinker@codemud.net>
parents: 1347
diff changeset
205
22a79dcbaec6 Change structure of provide_traits and method_map_traits
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diff changeset
206 a_trait = method.im_class
1345
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diff changeset
207 if a_trait not in derived_traits:
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parents:
diff changeset
208 raise TypeError, \
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209 '%s is not a trait used by the composition class' % \
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parents:
diff changeset
210 (repr(a_trait))
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parents:
diff changeset
211
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212 derived = derived_traits[a_trait]
1348
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diff changeset
213 func = method.im_func
22a79dcbaec6 Change structure of provide_traits and method_map_traits
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diff changeset
214 proxy = trait_method_proxy(derived, func)
22a79dcbaec6 Change structure of provide_traits and method_map_traits
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diff changeset
215 setattr(clazz, attrname, proxy)
1345
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diff changeset
216 pass
1347
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parents: 1346
diff changeset
217 pass
aaa88d805aac Refactory composite() to smaller functions
Thinker K.F. Li <thinker@codemud.net>
parents: 1346
diff changeset
218
aaa88d805aac Refactory composite() to smaller functions
Thinker K.F. Li <thinker@codemud.net>
parents: 1346
diff changeset
219
aaa88d805aac Refactory composite() to smaller functions
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220 ## \brief A decorator to make class composited from traits.
aaa88d805aac Refactory composite() to smaller functions
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221 #
aaa88d805aac Refactory composite() to smaller functions
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222 # The class decorated by composite must own a use_traits attribute.
aaa88d805aac Refactory composite() to smaller functions
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223 #
aaa88d805aac Refactory composite() to smaller functions
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diff changeset
224 # \verbatim
aaa88d805aac Refactory composite() to smaller functions
Thinker K.F. Li <thinker@codemud.net>
parents: 1346
diff changeset
225 # @trait
aaa88d805aac Refactory composite() to smaller functions
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226 # class trait_a(object):
aaa88d805aac Refactory composite() to smaller functions
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diff changeset
227 # var_a = require
aaa88d805aac Refactory composite() to smaller functions
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diff changeset
228 # def xxx(self): return self.var_a
aaa88d805aac Refactory composite() to smaller functions
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diff changeset
229 #
aaa88d805aac Refactory composite() to smaller functions
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parents: 1346
diff changeset
230 # @trait
aaa88d805aac Refactory composite() to smaller functions
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diff changeset
231 # class trait_b(object):
aaa88d805aac Refactory composite() to smaller functions
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diff changeset
232 # def ooo(self): pass
aaa88d805aac Refactory composite() to smaller functions
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diff changeset
233 #
aaa88d805aac Refactory composite() to smaller functions
Thinker K.F. Li <thinker@codemud.net>
parents: 1346
diff changeset
234 # @composite
aaa88d805aac Refactory composite() to smaller functions
Thinker K.F. Li <thinker@codemud.net>
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diff changeset
235 # class foo(object):
aaa88d805aac Refactory composite() to smaller functions
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diff changeset
236 # use_traits = (trait_a, trait_b)
aaa88d805aac Refactory composite() to smaller functions
Thinker K.F. Li <thinker@codemud.net>
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diff changeset
237 #
aaa88d805aac Refactory composite() to smaller functions
Thinker K.F. Li <thinker@codemud.net>
parents: 1346
diff changeset
238 # var_a = 'value of var_a'
aaa88d805aac Refactory composite() to smaller functions
Thinker K.F. Li <thinker@codemud.net>
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diff changeset
239 # pass
aaa88d805aac Refactory composite() to smaller functions
Thinker K.F. Li <thinker@codemud.net>
parents: 1346
diff changeset
240 #
aaa88d805aac Refactory composite() to smaller functions
Thinker K.F. Li <thinker@codemud.net>
parents: 1346
diff changeset
241 # obj = foo()
aaa88d805aac Refactory composite() to smaller functions
Thinker K.F. Li <thinker@codemud.net>
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diff changeset
242 # \endverbatim
aaa88d805aac Refactory composite() to smaller functions
Thinker K.F. Li <thinker@codemud.net>
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diff changeset
243 #
aaa88d805aac Refactory composite() to smaller functions
Thinker K.F. Li <thinker@codemud.net>
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diff changeset
244 # To make a class from a set of traits. You must decorate the class
aaa88d805aac Refactory composite() to smaller functions
Thinker K.F. Li <thinker@codemud.net>
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245 # with the decorator 'composite'. The class must has an attribute,
aaa88d805aac Refactory composite() to smaller functions
Thinker K.F. Li <thinker@codemud.net>
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diff changeset
246 # named use_traits, to provide a list or tuple of traits.
aaa88d805aac Refactory composite() to smaller functions
Thinker K.F. Li <thinker@codemud.net>
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diff changeset
247 #
aaa88d805aac Refactory composite() to smaller functions
Thinker K.F. Li <thinker@codemud.net>
parents: 1346
diff changeset
248 # Class that defines a trait must decorated with the decorator
aaa88d805aac Refactory composite() to smaller functions
Thinker K.F. Li <thinker@codemud.net>
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diff changeset
249 # 'trait'. If the trait need to access state (varaibles) of the
aaa88d805aac Refactory composite() to smaller functions
Thinker K.F. Li <thinker@codemud.net>
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diff changeset
250 # intances of composition class, it must define attributes with value
aaa88d805aac Refactory composite() to smaller functions
Thinker K.F. Li <thinker@codemud.net>
parents: 1346
diff changeset
251 # 'require', likes what 'var_a' of trait_a does. Then, the attributes
aaa88d805aac Refactory composite() to smaller functions
Thinker K.F. Li <thinker@codemud.net>
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diff changeset
252 # would be mapped to corresponding attributes of instances of
aaa88d805aac Refactory composite() to smaller functions
Thinker K.F. Li <thinker@codemud.net>
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diff changeset
253 # composition class. For example, when you call obj.xxx(), it returns
aaa88d805aac Refactory composite() to smaller functions
Thinker K.F. Li <thinker@codemud.net>
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diff changeset
254 # value of 'var_a', and attribute 'var_a' is a property that returns
aaa88d805aac Refactory composite() to smaller functions
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parents: 1346
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255 # the value of 'var_a' of 'obj', an instance of class foo.
aaa88d805aac Refactory composite() to smaller functions
Thinker K.F. Li <thinker@codemud.net>
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diff changeset
256 #
aaa88d805aac Refactory composite() to smaller functions
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parents: 1346
diff changeset
257 # By default, traits map attribute 'var_a' to 'var_a' of instances of
aaa88d805aac Refactory composite() to smaller functions
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diff changeset
258 # composition classes. But, you can change it by specifying the map
aaa88d805aac Refactory composite() to smaller functions
Thinker K.F. Li <thinker@codemud.net>
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diff changeset
259 # in an attribute, named 'provide_traits', defined in composition
1348
22a79dcbaec6 Change structure of provide_traits and method_map_traits
Thinker K.F. Li <thinker@codemud.net>
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diff changeset
260 # class. The attribute provide_traits of a composition class is a
22a79dcbaec6 Change structure of provide_traits and method_map_traits
Thinker K.F. Li <thinker@codemud.net>
parents: 1347
diff changeset
261 # dictionary mapping from require attributes of used traits to names
22a79dcbaec6 Change structure of provide_traits and method_map_traits
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parents: 1347
diff changeset
262 # of attributes of the composition class.
1347
aaa88d805aac Refactory composite() to smaller functions
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diff changeset
263 #
1349
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parents: 1348
diff changeset
264 # \verbatim
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parents: 1348
diff changeset
265 # @composite
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diff changeset
266 # class foo(object):
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267 # use_trait = (trait_a, trait_b)
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268 # provide_traits = {trait_a.var_a: 'var_foo'}
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269 #
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270 # var_foo = 'value of var_foo'
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271 # pass
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272 # \endverbatim
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273 #
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274 # Like mapping require attributes of used traits, there is a map,
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275 # named method_map_traits, for methods of used traits.
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276 #
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277 # \verbatim
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278 # @composite
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279 # class foo(object):
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280 # use_trait = (trait_a, trait_b)
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281 # provide_traits = {trait_a.var_a: 'var_foo'}
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282 # method_map_traits = {trait_a.xxx: 'hello')
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283 #
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284 # var_foo = 'value of var_foo'
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285 # pass
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286 # \endverbatim
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287 #
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288 # Previous example maps trait_a.xxx method to foo.hello method.
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289 # composite does not include methods that has a name prefixed by a '_'
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290 # charater. But, you can still force it, by an explicity mapping in
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291 # method_map_traits, to include a method prefixed by a '_' character.
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292 #
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293 def composite(clazz):
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294 if not hasattr(clazz, 'use_traits'):
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295 raise KeyError, \
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296 '%s has no use_trait: it must be a list of traits' % (repr(clazz))
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297 traits = clazz.use_traits
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298
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299 for a_trait in traits:
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300 if not hasattr(a_trait, '_is_trait'):
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301 raise TypeError, '%s is not a trait' % (repr(a_trait))
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302 pass
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303
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304 _check_provide_traits(clazz)
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305
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306 _include_methods(clazz)
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307
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308 return clazz
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309
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310
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311 if __name__ == '__main__':
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312 @trait
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313 class hello(object):
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314 msg = require
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315 bye_provide = require
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316
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317 def hello(self, name):
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318 return self.msg + ' hello ' + name
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319
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320 def hello_provide(self):
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321 return 'hello provide'
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322
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323 def require_bye(self):
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324 return self.bye_provide()
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325 pass
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326
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327 @trait
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328 class bye(object):
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329 msg = require
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330 hello_provide = require
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331
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332 def bye(self, name):
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333 return self.msg + ' bye ' + name
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334
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335 def bye_provide(self):
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336 return 'bye provide'
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337
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338 def require_hello(self):
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339 return self.hello_provide()
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340 pass
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341
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342 @composite
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343 class hello_bye(object):
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344 use_traits = (hello, bye)
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345 provide_traits = {hello.msg: 'msg1'}
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346 method_map_traits = {hello.hello: 'hello1'}
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347
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348 msg = 'hello_bye'
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349 msg1 = 'hello_bye_msg1'
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350 pass
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351
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352 o = hello_bye()
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353 assert o.hello1('Miky') == 'hello_bye_msg1 hello Miky'
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354 assert o.bye('Miky') == 'hello_bye bye Miky'
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Thinker K.F. Li <thinker@codemud.net>
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355 assert o.require_bye() == 'bye provide'
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356 assert o.require_hello() == 'hello provide'
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357 print 'OK'
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358 pass