Mercurial > parpg-source

annotate bGrease/component/field.py @ 41:ff3e395abf91

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Renamed grease to bGrease (Basic Grease) to get rid of conflicts with an already installed grease.
author KarstenBock@gmx.net
date Mon, 05 Sep 2011 15:00:34 +0200
parents grease/component/field.py@bf165b30254f
children e856b604b650
rev   line source
5
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1 #############################################################################
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2 #
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3 # Copyright (c) 2010 by Casey Duncan and contributors
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4 # All Rights Reserved.
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5 #
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6 # This software is subject to the provisions of the MIT License
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7 # A copy of the license should accompany this distribution.
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8 # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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9 # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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10 # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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11 #
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12 #############################################################################
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13
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14 __version__ = '$Id$'
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15
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16 import operator
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17 from bGrease.geometry import Vec2d, Vec2dArray, Rect
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18 from bGrease import color
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19
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20 # Allowed field types -> default values
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21 types = {int:lambda: 0,
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22 float:lambda: 0.0,
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23 bool:lambda: False,
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24 str:lambda:"",
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25 object:lambda:None,
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26 Vec2d:lambda: Vec2d(0,0),
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27 Vec2dArray:lambda: Vec2dArray(),
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28 color.RGBA: lambda: color.RGBA(0.0, 0.0, 0.0, 0.0),
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29 Rect: lambda: Rect(0.0, 0.0, 0.0, 0.0),
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30 list: lambda: list(),
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31 dict: lambda: dict(),
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32 }
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33
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34 class Schema(dict):
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35 """Field schema definition for custom components"""
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36
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37 def __init__(self, **fields):
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38 for ftype in fields.values():
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39 assert ftype in types, fname + " has an illegal field type"
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40 self.update(fields)
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41
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42
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43 class FieldAccessor(object):
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44 """Facade for manipulating a field for a set of entities"""
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45
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46 __field = None
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47 __entities = None
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48 __attrs = None
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49 __getter = None
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50 __parent_getters = ()
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51
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52 def __init__(self, field, entities, attrs=()):
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53 self.__field = field
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54 self.__entities = entities
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55 field_getter = operator.attrgetter(field.name)
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56 self.__attrs = attrs
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57 if attrs:
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58 getters = [field_getter] + [operator.attrgetter(attr) for attr in attrs]
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59 def get(entity):
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60 value = entity
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61 for getter in getters:
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62 value = getter(value)
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63 return value
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64 self.__getter = get
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65 self.__parent_getters = getters[:-1]
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66 else:
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67 self.__getter = field_getter
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68
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69 def __getattr__(self, name):
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70 """Return a FieldAccessor for the child attribute"""
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71 return self.__class__(self.__field, self.__entities, self.__attrs + (name,))
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72
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73 def __setattr__(self, name, value):
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74 if value is self:
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75 return # returned by mutators
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76 if hasattr(self.__class__, name):
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77 # Set local attr
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78 self.__dict__[name] = value
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79 elif not name.startswith('_'):
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80 getattr(self, name).__set__(value)
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81 else:
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82 raise AttributeError("Cannot set field attribute: %s" % name)
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83
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84 @property
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85 def __setter(self):
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86 """Return the proper setter function for setting the field value"""
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87 if not self.__attrs:
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88 return setattr
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89 else:
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90 parent_getters = self.__parent_getters
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91 def setter(data, name, value):
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92 for getter in parent_getters:
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93 data = getter(data)
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94 setattr(data, name, value)
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95 self.__setter = setter
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96 return setter
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97
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98 def __set__(self, value):
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99 """Set field values en masse"""
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100 # Mass set field attr
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101 setter = self.__setter
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102 component = self.__field.component
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103 if self.__attrs:
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104 name = self.__attrs[-1]
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105 else:
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106 name = self.__field.name
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107 if isinstance(value, FieldAccessor):
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108 # Join set between two entity sets
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109 if not self.__attrs:
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110 cast = self.__field.cast
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111 else:
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112 cast = lambda x: x
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113 for entity in self.__entities:
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114 try:
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115 setter(component[entity], name, cast(value[entity]))
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116 except KeyError:
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117 pass
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118 else:
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119 if not self.__attrs:
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120 value = self.__field.cast(value)
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121 for entity in self.__entities:
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122 try:
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123 setter(component[entity], name, value)
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124 except KeyError:
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125 pass
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126
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127 def __getitem__(self, entity):
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128 """Return the field value for a single entity (used for joins)"""
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129 if entity in self.__entities:
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130 return self.__getter(self.__field.component[entity])
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131 raise KeyError(entity)
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132
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133 def __contains__(self, entity):
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134 return entity in self.__entities
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135
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136 def __repr__(self):
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137 return '<%s %s @ %x>' % (
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138 self.__class__.__name__,
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139 '.'.join((self.__field.name,) + self.__attrs), id(self))
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140
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141 def __nonzero__(self):
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142 return bool(self.__entities)
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143
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144 def __iter__(self):
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145 """Return an iterator of all field values in the set"""
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146 component = self.__field.component
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147 getter = self.__getter
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148 for entity in self.__entities:
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149 try:
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150 data = component[entity]
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151 except KeyError:
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152 continue
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153 yield getter(data)
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154
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155 ## batch comparison operators ##
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156
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157 def __match(self, value, op):
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158 component = self.__field.component
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159 getter = self.__getter
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160 matches = set()
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161 add = matches.add
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162 if isinstance(value, FieldAccessor):
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163 # Join match between entity sets
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164 for entity in self.__entities:
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165 try:
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166 data = component[entity]
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167 other = value[entity]
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168 except KeyError:
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169 continue
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170 if op(getter(data), other):
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171 add(entity)
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172 else:
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173 for entity in self.__entities:
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174 try:
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175 data = component[entity]
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176 except KeyError:
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177 continue
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178 if op(getter(data), value):
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179 add(entity)
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180 return matches
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181
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182 def __eq__(self, value):
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183 """Return an entity set of all entities with a matching field value"""
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184 return self.__match(value, operator.eq)
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185
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186 def __ne__(self, value):
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187 """Return an entity set of all entities not matching field value"""
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188 return self.__match(value, operator.ne)
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189
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190 def __gt__(self, value):
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191 """Return an entity set of all entities with a greater field value"""
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192 return self.__match(value, operator.gt)
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193
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194 def __ge__(self, value):
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195 """Return an entity set of all entities with a greater or equal field value"""
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196 return self.__match(value, operator.ge)
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197
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198 def __lt__(self, value):
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199 """Return an entity set of all entities with a lesser field value"""
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200 return self.__match(value, operator.lt)
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201
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202 def __le__(self, value):
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203 """Return an entity set of all entities with a lesser or equal field value"""
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204 return self.__match(value, operator.le)
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205
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206 def _contains(self, values):
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207 """Return an entity set of all entities with a field value contained in values"""
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208 return self.__match(values, operator.contains)
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209
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210 ## Batch in-place mutator methods
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211
13
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212 def __mutate(self, value, op):
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213 component = self.__field.component
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214 if self.__attrs:
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215 name = self.__attrs[-1]
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216 else:
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217 name = self.__field.name
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218 getter = self.__getter
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219 setter = self.__setter
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220 if isinstance(value, FieldAccessor):
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221 # Join between entity sets
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222 for entity in self.__entities:
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223 try:
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224 data = component[entity]
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225 other = value[entity]
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226 except KeyError:
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227 continue
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228 setter(data, name, op(getter(data), other))
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229 else:
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230 for entity in self.__entities:
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231 try:
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232 data = component[entity]
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233 except KeyError:
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234 continue
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235 setter(data, name, op(getter(data), value))
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236 return self
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237
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238 def __iadd__(self, value):
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239 return self.__mutate(value, operator.iadd)
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240
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241 def __isub__(self, value):
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242 return self.__mutate(value, operator.isub)
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243
13
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244 def __imul__(self, value):
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245 return self.__mutate(value, operator.imul)
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246
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247 def __idiv__(self, value):
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248 return self.__mutate(value, operator.idiv)
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249
13
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250 def __itruediv__(self, value):
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251 return self.__mutate(value, operator.itruediv)
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252
13
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253 def __ifloordiv__(self, value):
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254 return self.__mutate(value, operator.ifloordiv)
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255
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diff changeset
256 def __imod__(self, value):
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257 return self.__mutate(value, operator.imod)
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258
13
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259 def __ipow__(self, value):
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260 return self.__mutate(value, operator.ipow)
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261
13
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262 def __ilshift__(self, value):
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263 return self.__mutate(value, operator.ilshift)
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264
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265 def __irshift__(self, value):
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266 return self.__mutate(value, operator.irshift)
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267
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268 def __iand__(self, value):
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269 return self.__mutate(value, operator.iand)
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270
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271 def __ior__(self, value):
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272 return self.__mutate(value, operator.ior)
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273
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274 def __ixor__(self, value):
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275 return self.__mutate(value, operator.ixor)
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276
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277
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278 class Field(object):
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279 """Component field metadata and accessor interface"""
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280
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281 def __init__(self, component, name, type, accessor_factory=FieldAccessor):
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282 self.component = component
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283 self.name = name
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284 self.type = type
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285 self.default = types.get(type)
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286 self.accessor_factory = accessor_factory
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287
13
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288 def cast(self, value):
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289 """Cast value to the appropriate type for thi field"""
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290 if self.type is not object:
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291 return self.type(value)
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292 else:
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293 return value
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294
13
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295 def accessor(self, entities=None):
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296 """Return the field accessor for the entities in the component,
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297 or all entities in the set specified that are also in the component
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298 """
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299 if entities is None or entities is self.component.entities:
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300 entities = self.component.entities
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301 else:
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302 entities = entities & self.component.entities
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303 return self.accessor_factory(self, entities)