Mercurial > piecrust2

annotate piecrust/data/pagedata.py @ 712:aed8a860c1d0

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internal: Remove exception logging that shouldn't happen. Better message.
author Ludovic Chabant <ludovic@chabant.com>
date Thu, 26 May 2016 20:43:51 -0700
parents ab5c6a8ae90a
children e35407c60e00
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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 raise AttributeError("No such attribute: %s" % name) from ex
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37
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38 def __getitem__(self, name):
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39 try:
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40 return self._getValue(name)
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41 except LazyPageConfigLoaderHasNoValue as ex:
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42 raise KeyError("No such key: %s" % name) from ex
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43
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44 def __iter__(self):
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45 keys = set(self._page.config.keys())
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46 keys |= set(self._values.keys())
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47 keys |= set(self._loaders.keys())
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48 keys.discard('*')
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49 return iter(keys)
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50
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51 def __len__(self):
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52 return len(self._page.config) + len(self._values) + len(self._loaders)
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53
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54 def _getValue(self, name):
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55 # First try the page configuration itself.
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56 try:
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57 return self._page.config[name]
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58 except KeyError:
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59 pass
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60
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61 # Then try loaded values.
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62 self._ensureLoaded()
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63 try:
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64 return self._values[name]
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65 except KeyError:
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66 pass
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67
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68 # Try a loader for a new value.
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69 loader = self._loaders.get(name)
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70 if loader is not None:
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71 try:
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72 self._values[name] = loader(self, name)
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73 except LazyPageConfigLoaderHasNoValue:
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74 raise
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75 except Exception as ex:
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76 logger.exception(ex)
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77 raise Exception(
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78 "Error while loading attribute '%s' for: %s" %
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79 (name, self._page.rel_path)) from ex
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80
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81 # Forget this loader now that it served its purpose.
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82 try:
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83 del self._loaders[name]
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84 except KeyError:
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85 pass
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86 return self._values[name]
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87
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88 # Try the wildcard loader if it exists.
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89 loader = self._loaders.get('*')
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90 if loader is not None:
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91 try:
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92 self._values[name] = loader(self, name)
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93 except LazyPageConfigLoaderHasNoValue:
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94 raise
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95 except Exception as ex:
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96 logger.exception(ex)
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97 raise Exception(
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98 "Error while loading attribute '%s' for: %s" %
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99 (name, self._page.rel_path)) from ex
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100 # We always keep the wildcard loader in the loaders list.
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101 return self._values[name]
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102
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103 raise LazyPageConfigLoaderHasNoValue("No such value: %s" % name)
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104
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105 def _setValue(self, name, value):
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106 self._values[name] = value
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107
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108 def _unmapLoader(self, attr_name):
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109 try:
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110 del self._loaders[attr_name]
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111 except KeyError:
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112 pass
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113
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114 def _mapLoader(self, attr_name, loader, override_existing=False):
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115 assert loader is not None
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116
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117 if not override_existing and attr_name in self._loaders:
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118 raise Exception(
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119 "A loader has already been mapped for: %s" % attr_name)
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120 self._loaders[attr_name] = loader
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121
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122 def _mapValue(self, attr_name, value, override_existing=False):
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123 loader = lambda _, __: value
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124 self._mapLoader(attr_name, loader, override_existing=override_existing)
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125
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126 def _ensureLoaded(self):
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127 if self._is_loaded:
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128 return
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129
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130 self._is_loaded = True
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131 try:
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132 self._load()
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133 except Exception as ex:
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134 logger.exception(ex)
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135 raise Exception(
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136 "Error while loading data for: %s" %
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137 self._page.rel_path) from ex
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138
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139 def _load(self):
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140 pass
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141
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142 def _debugRenderKeys(self):
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143 self._ensureLoaded()
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144 keys = set(self._values.keys())
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145 if self._loaders:
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146 keys |= set(self._loaders.keys())
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147 keys.discard('*')
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148 return list(keys)
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149
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150
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151 class PageData(LazyPageConfigData):
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152 """ Template data for a page.
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153 """
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154 def __init__(self, page, ctx):
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155 super(PageData, self).__init__(page)
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156 self._ctx = ctx
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157
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158 def _load(self):
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159 page = self._page
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160 for k, v in page.source_metadata.items():
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161 self._setValue(k, v)
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162 self._setValue('url', self._ctx.uri)
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163 self._setValue('timestamp', time.mktime(page.datetime.timetuple()))
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164 date_format = page.app.config.get('site/date_format')
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165 if date_format:
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166 self._setValue('date', page.datetime.strftime(date_format))
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167