Mercurial > piecrust2

annotate piecrust/data/base.py @ 10:cd35d356ccce

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Fix some bugs with iterators, add some unit tests.
author Ludovic Chabant <ludovic@chabant.com>
date Sun, 17 Aug 2014 21:18:48 -0700
parents f5ca5c5bed85
children 30a42341cfa8
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3
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1 import time
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2 import logging
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3 from piecrust.data.assetor import Assetor
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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
6
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9 class IPaginationSource(object):
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10 def getItemsPerPage(self):
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11 raise NotImplementedError()
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12
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13 def getSourceIterator(self):
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14 raise NotImplementedError()
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15
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16 def getSorterIterator(self, it):
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17 raise NotImplementedError()
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18
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19 def getTailIterator(self, it):
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20 raise NotImplementedError()
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21
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22 def getPaginationFilter(self, page):
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23 raise NotImplementedError()
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24
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25
3
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26 class LazyPageConfigData(object):
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27 """ An object that represents the configuration header of a page,
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28 but also allows for additional data. It's meant to be exposed
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29 to the templating system.
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30 """
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31 def __init__(self, page):
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32 self._page = page
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33 self._values = None
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34 self._loaders = None
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35
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36 @property
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37 def page(self):
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38 return self._page
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39
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40 def __getitem__(self, name):
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41 self._load()
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42
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43 if self._loaders:
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44 loader = self._loaders.get(name)
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45 if loader is not None:
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46 try:
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47 self._values[name] = loader(self, name)
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48 except Exception as ex:
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49 logger.error("Error while loading attribute '%s' for: %s"
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50 % (name, self._page.path))
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51 logger.exception(ex)
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52 raise Exception("Internal Error: %s" % ex)
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53
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54 # We need to double-check `_loaders` here because
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55 # the loader could have removed all loaders, which
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56 # would set this back to `None`.
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57 if self._loaders is not None:
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58 del self._loaders[name]
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59 if len(self._loaders) == 0:
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60 self._loaders = None
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61
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62 return self._values[name]
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63
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64 def setValue(self, name, value):
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65 self._values[name] = value
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66
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67 def mapLoader(self, attr_name, loader):
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68 if loader is None:
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69 if self._loaders is None or attr_name not in self._loaders:
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70 return
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71 del self._loaders[attr_name]
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72 if len(self._loaders) == 0:
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73 self._loaders = None
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74 return
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75
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76 if self._loaders is None:
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77 self._loaders = {}
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78 if attr_name in self._loaders:
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79 raise Exception("A loader has already been mapped for: %s" %
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80 attr_name)
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81 self._loaders[attr_name] = loader
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82
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83 def _load(self):
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84 if self._values is not None:
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85 return
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86 self._values = dict(self._page.config.get())
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87 try:
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88 self._loadCustom()
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89 except Exception as ex:
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90 logger.error("Error while loading data for: %s" % self._page.path)
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91 logger.exception(ex)
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92 raise Exception("Internal Error: %s" % ex)
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93
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94 def _loadCustom(self):
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95 pass
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96
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97
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98 class PaginationData(LazyPageConfigData):
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99 def __init__(self, page):
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100 super(PaginationData, self).__init__(page)
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101
6
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102 def _get_uri(self):
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103 page = self._page
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104 route = page.app.getRoute(page.source.name, page.source_metadata)
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105 if route is None:
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106 raise Exception("Can't get route for page: %s" % page.path)
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107 return route.getUri(page.source_metadata)
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108
3
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109 def _loadCustom(self):
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110 page_url = self._get_uri()
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111 self.setValue('url', page_url)
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112 self.setValue('slug', page_url)
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113 self.setValue('timestamp',
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114 time.mktime(self.page.datetime.timetuple()))
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115 date_format = self.page.app.config.get('site/date_format')
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116 if date_format:
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117 self.setValue('date', self.page.datetime.strftime(date_format))
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118
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119 assetor = Assetor(self.page, page_url)
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120 self.setValue('assets', assetor)
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121
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122 segment_names = self.page.config.get('segments')
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123 for name in segment_names:
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124 self.mapLoader(name, self._load_rendered_segment)
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125
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126 def _load_rendered_segment(self, data, name):
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127 from piecrust.rendering import PageRenderingContext, render_page_segments
3
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128
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129 assert self is data
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130 uri = self._get_uri()
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131 try:
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132 ctx = PageRenderingContext(self._page, uri)
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133 segs = render_page_segments(ctx)
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134 except Exception as e:
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135 logger.exception("Error rendering segments for '%s': %s" % (uri, e))
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136 raise
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137
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138 for k, v in segs.items():
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139 self.mapLoader(k, None)
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140 self.setValue(k, v)
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141
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142 if 'content.abstract' in segs:
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143 self.setValue('content', segs['content.abstract'])
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144 self.setValue('has_more', True)
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145 if name == 'content':
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146 return segs['content.abstract']
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147
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148 return segs[name]
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149