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annotate piecrust/data/base.py @ 195:b4724e577a8c

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cosmetic: Fix some PEP8 issues.
author Ludovic Chabant <ludovic@chabant.com>
date Sun, 11 Jan 2015 23:04:55 -0800
parents 1187739e5a19
children e9dc18a275ff
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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 from piecrust.uriutil import get_slug
3
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5
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6
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7 logger = logging.getLogger(__name__)
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8
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9
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10 class IPaginationSource(object):
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11 """ Defines the interface for a source that can be used as the data
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12 for an iterator or a pagination.
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13 """
6
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14 def getItemsPerPage(self):
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15 raise NotImplementedError()
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16
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17 def getSourceIterator(self):
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18 raise NotImplementedError()
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19
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20 def getSorterIterator(self, it):
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21 raise NotImplementedError()
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22
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23 def getTailIterator(self, it):
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24 raise NotImplementedError()
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25
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26 def getPaginationFilter(self, page):
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27 raise NotImplementedError()
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28
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29
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30 class LazyPageConfigData(object):
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31 """ An object that represents the configuration header of a page,
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32 but also allows for additional data. It's meant to be exposed
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33 to the templating system.
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34 """
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35 debug_render = []
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36 debug_render_dynamic = ['_debugRenderKeys']
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37
3
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38 def __init__(self, page):
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39 self._page = page
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40 self._values = None
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41 self._loaders = None
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42
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43 @property
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44 def page(self):
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45 return self._page
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46
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47 def __getattr__(self, name):
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48 try:
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49 return self.getValue(name)
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50 except KeyError:
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51 raise AttributeError
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52
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53 def __getitem__(self, name):
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54 return self.getValue(name)
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55
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56 def getValue(self, name):
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57 self._load()
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58
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59 if self._loaders:
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60 loader = self._loaders.get(name)
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61 if loader is not None:
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62 try:
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63 self._values[name] = loader(self, name)
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64 except Exception as ex:
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65 raise Exception(
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66 "Error while loading attribute '%s' for: %s" %
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67 (name, self._page.rel_path)) from ex
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68
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69 # We need to double-check `_loaders` here because
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70 # the loader could have removed all loaders, which
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71 # would set this back to `None`.
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72 if self._loaders is not None:
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73 del self._loaders[name]
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74 if len(self._loaders) == 0:
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75 self._loaders = None
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76
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77 return self._values[name]
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78
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79 def setValue(self, name, value):
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80 self._values[name] = value
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81
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82 def mapLoader(self, attr_name, loader):
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83 if loader is None:
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84 if self._loaders is None or attr_name not in self._loaders:
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85 return
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86 del self._loaders[attr_name]
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87 if len(self._loaders) == 0:
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88 self._loaders = None
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89 return
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90
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91 if self._loaders is None:
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92 self._loaders = {}
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93 if attr_name in self._loaders:
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94 raise Exception(
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95 "A loader has already been mapped for: %s" % attr_name)
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96 self._loaders[attr_name] = loader
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97
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98 def _load(self):
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99 if self._values is not None:
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100 return
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101 self._values = dict(self._page.config.get())
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102 try:
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103 self._loadCustom()
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104 except Exception as ex:
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105 raise Exception(
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106 "Error while loading data for: %s" %
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107 self._page.rel_path) from ex
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108
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109 def _loadCustom(self):
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110 pass
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111
12
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112 def _debugRenderKeys(self):
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113 self._load()
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114 keys = set(self._values.keys())
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115 if self._loaders:
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116 keys |= set(self._loaders.keys())
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117 return list(keys)
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118
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119
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120 class PaginationData(LazyPageConfigData):
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121 def __init__(self, page):
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122 super(PaginationData, self).__init__(page)
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123
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124 def _get_uri(self):
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125 page = self._page
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126 route = page.app.getRoute(page.source.name, page.source_metadata)
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127 if route is None:
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128 raise Exception("Can't get route for page: %s" % page.path)
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129 return route.getUri(page.source_metadata, page)
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130
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131 def _loadCustom(self):
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132 page_url = self._get_uri()
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133 self.setValue('url', page_url)
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134 self.setValue('slug', get_slug(self._page.app, page_url))
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135 self.setValue(
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136 'timestamp',
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137 time.mktime(self.page.datetime.timetuple()))
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138 date_format = self.page.app.config.get('site/date_format')
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139 if date_format:
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140 self.setValue('date', self.page.datetime.strftime(date_format))
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141
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142 assetor = Assetor(self.page, page_url)
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143 self.setValue('assets', assetor)
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144
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145 segment_names = self.page.config.get('segments')
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146 for name in segment_names:
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147 self.mapLoader(name, self._load_rendered_segment)
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148
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149 def _load_rendered_segment(self, data, name):
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150 do_render = True
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151 eis = self._page.app.env.exec_info_stack
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152 if eis is not None and eis.hasPage(self._page):
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153 # This is the pagination data for the page that is currently
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154 # being rendered! Inception! But this is possible... so just
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155 # prevent infinite recursion.
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156 do_render = False
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157
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158 assert self is data
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159
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160 if do_render:
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161 uri = self._get_uri()
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162 try:
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163 from piecrust.rendering import (
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164 PageRenderingContext, render_page_segments)
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165 ctx = PageRenderingContext(self._page, uri)
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166 segs = render_page_segments(ctx)
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167 except Exception as e:
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168 raise Exception(
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169 "Error rendering segments for '%s'" % uri) from e
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170 else:
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171 segs = {}
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172 for name in self.page.config.get('segments'):
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173 segs[name] = "<unavailable: current page>"
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174
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175 for k, v in segs.items():
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176 self.mapLoader(k, None)
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177 self.setValue(k, v)
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178
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179 if 'content.abstract' in segs:
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180 self.setValue('content', segs['content.abstract'])
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181 self.setValue('has_more', True)
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182 if name == 'content':
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183 return segs['content.abstract']
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184
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185 return segs[name]
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186