Mercurial > piecrust2

annotate piecrust/data/pagedata.py @ 711:ab5c6a8ae90a

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bake: Replace hard-coded taxonomy support with "generator" system. * Taxonomies are now implemented one or more `TaxonomyGenerator`s. * A `BlogArchivesGenerator` stub is there but non-functional.
author Ludovic Chabant <ludovic@chabant.com>
date Thu, 26 May 2016 19:52:47 -0700
parents 785dea918ad8
children aed8a860c1d0
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440
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1 import time
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2 import logging
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3 import collections.abc
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4
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5
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6 logger = logging.getLogger(__name__)
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7
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8
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9 class LazyPageConfigLoaderHasNoValue(Exception):
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10 """ An exception that can be returned when a loader for `LazyPageConfig`
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11 can't return any value.
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12 """
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13 pass
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14
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15
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16 class LazyPageConfigData(collections.abc.Mapping):
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17 """ An object that represents the configuration header of a page,
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18 but also allows for additional data. It's meant to be exposed
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19 to the templating system.
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20 """
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21 debug_render = []
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22 debug_render_invoke = []
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23 debug_render_dynamic = ['_debugRenderKeys']
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24 debug_render_invoke_dynamic = ['_debugRenderKeys']
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25
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26 def __init__(self, page):
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27 self._page = page
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28 self._values = {}
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29 self._loaders = {}
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30 self._is_loaded = False
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31
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32 def __getattr__(self, name):
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33 try:
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34 return self._getValue(name)
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35 except LazyPageConfigLoaderHasNoValue as ex:
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36 logger.exception(ex)
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37 raise AttributeError("No such attribute: %s" % name) from ex
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38
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39 def __getitem__(self, name):
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40 try:
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41 return self._getValue(name)
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42 except LazyPageConfigLoaderHasNoValue as ex:
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43 logger.exception(ex)
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44 raise KeyError("No such key: %s" % name) from ex
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45
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46 def __iter__(self):
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47 keys = set(self._page.config.keys())
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48 keys |= set(self._values.keys())
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49 keys |= set(self._loaders.keys())
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50 keys.discard('*')
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51 return iter(keys)
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52
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53 def __len__(self):
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54 return len(self._page.config) + len(self._values) + len(self._loaders)
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55
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56 def _getValue(self, name):
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57 # First try the page configuration itself.
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58 try:
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59 return self._page.config[name]
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60 except KeyError:
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61 pass
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62
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63 # Then try loaded values.
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64 self._ensureLoaded()
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65 try:
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66 return self._values[name]
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67 except KeyError:
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68 pass
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69
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70 # Try a loader for a new value.
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71 loader = self._loaders.get(name)
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72 if loader is not None:
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73 try:
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74 self._values[name] = loader(self, name)
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75 except LazyPageConfigLoaderHasNoValue:
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76 raise
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77 except Exception as ex:
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78 logger.exception(ex)
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79 raise Exception(
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80 "Error while loading attribute '%s' for: %s" %
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81 (name, self._page.rel_path)) from ex
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82
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83 # Forget this loader now that it served its purpose.
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84 try:
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85 del self._loaders[name]
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86 except KeyError:
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87 pass
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88 return self._values[name]
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89
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90 # Try the wildcard loader if it exists.
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91 loader = self._loaders.get('*')
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92 if loader is not None:
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93 try:
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94 self._values[name] = loader(self, name)
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95 except LazyPageConfigLoaderHasNoValue:
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96 raise
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97 except Exception as ex:
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98 logger.exception(ex)
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99 raise Exception(
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100 "Error while loading attribute '%s' for: %s" %
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101 (name, self._page.rel_path)) from ex
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102 # We always keep the wildcard loader in the loaders list.
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103 return self._values[name]
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104
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105 raise LazyPageConfigLoaderHasNoValue()
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106
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107 def _setValue(self, name, value):
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108 self._values[name] = value
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109
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110 def _unmapLoader(self, attr_name):
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111 try:
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112 del self._loaders[attr_name]
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113 except KeyError:
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114 pass
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115
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116 def _mapLoader(self, attr_name, loader, override_existing=False):
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117 assert loader is not None
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118
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119 if not override_existing and attr_name in self._loaders:
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120 raise Exception(
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121 "A loader has already been mapped for: %s" % attr_name)
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122 self._loaders[attr_name] = loader
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123
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124 def _mapValue(self, attr_name, value, override_existing=False):
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125 loader = lambda _, __: value
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126 self._mapLoader(attr_name, loader, override_existing=override_existing)
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127
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128 def _ensureLoaded(self):
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129 if self._is_loaded:
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130 return
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131
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132 self._is_loaded = True
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133 try:
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134 self._load()
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135 except Exception as ex:
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136 logger.exception(ex)
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137 raise Exception(
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138 "Error while loading data for: %s" %
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139 self._page.rel_path) from ex
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140
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141 def _load(self):
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142 pass
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143
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144 def _debugRenderKeys(self):
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145 self._ensureLoaded()
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146 keys = set(self._values.keys())
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147 if self._loaders:
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148 keys |= set(self._loaders.keys())
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149 keys.discard('*')
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150 return list(keys)
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151
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152
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153 class PageData(LazyPageConfigData):
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154 """ Template data for a page.
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155 """
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156 def __init__(self, page, ctx):
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157 super(PageData, self).__init__(page)
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158 self._ctx = ctx
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159
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160 def _load(self):
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161 page = self._page
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162 for k, v in page.source_metadata.items():
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163 self._setValue(k, v)
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164 self._setValue('url', self._ctx.uri)
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165 self._setValue('timestamp', time.mktime(page.datetime.timetuple()))
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166 date_format = page.app.config.get('site/date_format')
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167 if date_format:
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168 self._setValue('date', page.datetime.strftime(date_format))
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169