Mercurial > piecrust2

annotate piecrust/data/pagedata.py @ 550:6f216c1ab6b1

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bake: Add a flag to know which record entries got collapsed from last run. This makes it possible to find entries for things that were actually baked during the current run, as opposed to skipped because they were "clean".
author Ludovic Chabant <ludovic@chabant.com>
date Tue, 04 Aug 2015 21:22:30 -0700
parents 785dea918ad8
children ab5c6a8ae90a
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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440
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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 = set(self._page.config.keys())
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42 keys |= set(self._values.keys())
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43 keys |= set(self._loaders.keys())
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44 keys.discard('*')
440
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45 return iter(keys)
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46
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47 def __len__(self):
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48 return len(self._page.config) + len(self._values) + len(self._loaders)
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49
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50 def _getValue(self, name):
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51 # First try the page configuration itself.
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52 try:
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53 return self._page.config[name]
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54 except KeyError:
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55 pass
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56
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57 # Then try loaded values.
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58 self._ensureLoaded()
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59 try:
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60 return self._values[name]
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61 except KeyError:
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62 pass
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63
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64 # Try a loader for a new value.
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65 loader = self._loaders.get(name)
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66 if loader is not None:
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67 try:
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68 self._values[name] = loader(self, name)
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69 except LazyPageConfigLoaderHasNoValue:
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70 raise
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71 except Exception as ex:
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72 raise Exception(
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73 "Error while loading attribute '%s' for: %s" %
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74 (name, self._page.rel_path)) from ex
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75
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76 # Forget this loader now that it served its purpose.
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77 try:
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78 del self._loaders[name]
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79 except KeyError:
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80 pass
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81 return self._values[name]
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82
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83 # Try the wildcard loader if it exists.
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84 loader = self._loaders.get('*')
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85 if loader is not None:
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86 try:
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87 self._values[name] = loader(self, name)
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88 except LazyPageConfigLoaderHasNoValue:
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89 raise
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90 except Exception as ex:
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91 raise Exception(
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92 "Error while loading attribute '%s' for: %s" %
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93 (name, self._page.rel_path)) from ex
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94 # We always keep the wildcard loader in the loaders list.
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95 return self._values[name]
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96
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97 raise LazyPageConfigLoaderHasNoValue()
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98
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99 def _setValue(self, name, value):
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100 self._values[name] = value
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101
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102 def _unmapLoader(self, attr_name):
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103 try:
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104 del self._loaders[attr_name]
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105 except KeyError:
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106 pass
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107
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108 def _mapLoader(self, attr_name, loader, override_existing=False):
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109 assert loader is not None
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110
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111 if not override_existing and attr_name in self._loaders:
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112 raise Exception(
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113 "A loader has already been mapped for: %s" % attr_name)
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114 self._loaders[attr_name] = loader
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115
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116 def _mapValue(self, attr_name, value, override_existing=False):
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117 loader = lambda _, __: value
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118 self._mapLoader(attr_name, loader, override_existing=override_existing)
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119
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120 def _ensureLoaded(self):
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121 if self._is_loaded:
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122 return
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123
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124 self._is_loaded = True
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125 try:
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126 self._load()
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127 except Exception as ex:
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128 raise Exception(
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129 "Error while loading data for: %s" %
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130 self._page.rel_path) from ex
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131
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132 def _load(self):
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133 pass
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134
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135 def _debugRenderKeys(self):
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136 self._ensureLoaded()
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137 keys = set(self._values.keys())
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138 if self._loaders:
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139 keys |= set(self._loaders.keys())
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140 keys.discard('*')
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141 return list(keys)
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142
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143
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144 class PageData(LazyPageConfigData):
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145 """ Template data for a page.
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146 """
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147 def __init__(self, page, ctx):
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148 super(PageData, self).__init__(page)
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149 self._ctx = ctx
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150
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151 def _load(self):
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152 page = self._page
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153 for k, v in page.source_metadata.items():
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154 self._setValue(k, v)
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155 self._setValue('url', self._ctx.uri)
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156 self._setValue('timestamp', time.mktime(page.datetime.timetuple()))
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157 date_format = page.app.config.get('site/date_format')
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158 if date_format:
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159 self._setValue('date', page.datetime.strftime(date_format))
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160