Mercurial > piecrust2

annotate piecrust/data/pagedata.py @ 548:785dea918ad8

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debug: Fix a crash when rendering debug info for some pages.
author Ludovic Chabant <ludovic@chabant.com>
date Sun, 02 Aug 2015 23:01:59 -0700
parents 32c7c2d219d2
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