Mercurial > piecrust2

annotate piecrust/data/pagedata.py @ 440:32c7c2d219d2

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performance: Refactor how data is managed to reduce copying. * Make use of `collections.abc.Mapping` to better identify things that are supposed to look like dictionaries. * Instead of handling "overlay" of data in a dict tree in each different data object, make all objects `Mapping`s and handle merging at a higher level with the new `MergedMapping` object. * Since this new object is read-only, remove the need for deep-copying of app and page configurations. * Split data classes into separate modules.
author Ludovic Chabant <ludovic@chabant.com>
date Sun, 28 Jun 2015 08:22:39 -0700
parents
children 785dea918ad8
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rev   line source
440
32c7c2d219d2 performance: Refactor how data is managed to reduce copying.
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1 import time
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2 import collections.abc
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3
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4
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5 class LazyPageConfigLoaderHasNoValue(Exception):
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6 """ An exception that can be returned when a loader for `LazyPageConfig`
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7 can't return any value.
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8 """
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9 pass
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10
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11
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12 class LazyPageConfigData(collections.abc.Mapping):
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13 """ An object that represents the configuration header of a page,
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14 but also allows for additional data. It's meant to be exposed
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15 to the templating system.
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16 """
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17 debug_render = []
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18 debug_render_invoke = []
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19 debug_render_dynamic = ['_debugRenderKeys']
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20 debug_render_invoke_dynamic = ['_debugRenderKeys']
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21
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22 def __init__(self, page):
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23 self._page = page
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24 self._values = {}
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25 self._loaders = {}
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26 self._is_loaded = False
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27
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28 def __getattr__(self, name):
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29 try:
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30 return self._getValue(name)
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31 except LazyPageConfigLoaderHasNoValue as ex:
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32 raise AttributeError("No such attribute: %s" % name) from ex
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33
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34 def __getitem__(self, name):
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35 try:
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36 return self._getValue(name)
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37 except LazyPageConfigLoaderHasNoValue as ex:
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38 raise KeyError("No such key: %s" % name) from ex
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39
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40 def __iter__(self):
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41 keys = list(self._page.config.keys())
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42 keys += list(self._values.keys())
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43 keys += list(self._loaders.keys())
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44 return iter(keys)
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45
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46 def __len__(self):
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47 return len(self._page.config) + len(self._values) + len(self._loaders)
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48
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49 def _getValue(self, name):
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50 # First try the page configuration itself.
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51 try:
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52 return self._page.config[name]
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53 except KeyError:
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54 pass
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55
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56 # Then try loaded values.
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57 self._ensureLoaded()
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58 try:
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59 return self._values[name]
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60 except KeyError:
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61 pass
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62
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63 # Try a loader for a new value.
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64 loader = self._loaders.get(name)
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65 if loader is not None:
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66 try:
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67 self._values[name] = loader(self, name)
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68 except LazyPageConfigLoaderHasNoValue:
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69 raise
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70 except Exception as ex:
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71 raise Exception(
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72 "Error while loading attribute '%s' for: %s" %
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73 (name, self._page.rel_path)) from ex
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74
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75 # Forget this loader now that it served its purpose.
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76 try:
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77 del self._loaders[name]
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78 except KeyError:
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79 pass
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80 return self._values[name]
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81
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82 # Try the wildcard loader if it exists.
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83 loader = self._loaders.get('*')
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84 if loader is not None:
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85 try:
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86 self._values[name] = loader(self, name)
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87 except LazyPageConfigLoaderHasNoValue:
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88 raise
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89 except Exception as ex:
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90 raise Exception(
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91 "Error while loading attribute '%s' for: %s" %
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92 (name, self._page.rel_path)) from ex
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93 # We always keep the wildcard loader in the loaders list.
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94 return self._values[name]
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95
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96 raise LazyPageConfigLoaderHasNoValue()
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97
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98 def _setValue(self, name, value):
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99 self._values[name] = value
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100
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101 def _unmapLoader(self, attr_name):
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102 try:
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103 del self._loaders[attr_name]
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104 except KeyError:
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105 pass
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106
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107 def _mapLoader(self, attr_name, loader, override_existing=False):
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108 assert loader is not None
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109
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110 if not override_existing and attr_name in self._loaders:
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111 raise Exception(
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112 "A loader has already been mapped for: %s" % attr_name)
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113 self._loaders[attr_name] = loader
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114
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115 def _mapValue(self, attr_name, value, override_existing=False):
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116 loader = lambda _, __: value
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117 self._mapLoader(attr_name, loader, override_existing=override_existing)
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118
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119 def _ensureLoaded(self):
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120 if self._is_loaded:
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121 return
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122
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123 self._is_loaded = True
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124 try:
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125 self._load()
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126 except Exception as ex:
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127 raise Exception(
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128 "Error while loading data for: %s" %
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129 self._page.rel_path) from ex
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130
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131 def _load(self):
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132 pass
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133
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134 def _debugRenderKeys(self):
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135 self._ensureLoaded()
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136 keys = set(self._values.keys())
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137 if self._loaders:
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138 keys |= set(self._loaders.keys())
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139 return list(keys)
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140
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141
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142 class PageData(LazyPageConfigData):
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143 """ Template data for a page.
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144 """
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145 def __init__(self, page, ctx):
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146 super(PageData, self).__init__(page)
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147 self._ctx = ctx
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148
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149 def _load(self):
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150 page = self._page
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151 for k, v in page.source_metadata.items():
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152 self._setValue(k, v)
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153 self._setValue('url', self._ctx.uri)
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154 self._setValue('timestamp', time.mktime(page.datetime.timetuple()))
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155 date_format = page.app.config.get('site/date_format')
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156 if date_format:
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157 self._setValue('date', page.datetime.strftime(date_format))
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158