Mercurial > piecrust2

annotate piecrust/data/base.py @ 402:043b9d8304c7 2.0.0a11

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linker: Fix linker returning the wrong value for `is_dir` in some situations.
author Ludovic Chabant <ludovic@chabant.com>
date Mon, 18 May 2015 23:45:51 -0700
parents 923a9b96411d
children fd8e39254da0
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
369
4b1019bb2533 serve: Giant refactor to change how we handle data when serving pages.
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diff changeset
1 import copy
3
f485ba500df3 Gigantic change to basically make PieCrust 2 vaguely functional.
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2 import time
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3 import logging
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4 from piecrust.data.assetor import Assetor
329
422052d2e978 internal: Try handling URLs in a consistent way.
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5 from piecrust.uriutil import split_uri
3
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6
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7
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8 logger = logging.getLogger(__name__)
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9
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10
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11 class LazyPageConfigLoaderHasNoValue(Exception):
4c9eab0e283b data: Fix problems with using non-existing metadata on a linked page.
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12 """ An exception that can be returned when a loader for `LazyPageConfig`
4c9eab0e283b data: Fix problems with using non-existing metadata on a linked page.
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13 can't return any value.
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14 """
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15 pass
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16
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17
3
f485ba500df3 Gigantic change to basically make PieCrust 2 vaguely functional.
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18 class LazyPageConfigData(object):
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19 """ An object that represents the configuration header of a page,
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20 but also allows for additional data. It's meant to be exposed
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21 to the templating system.
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22 """
12
30a42341cfa8 Define page slugs properly, avoid recursions with debug data.
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23 debug_render = []
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24 debug_render_dynamic = ['_debugRenderKeys']
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25
3
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26 def __init__(self, page):
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27 self._page = page
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28 self._values = None
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29 self._loaders = None
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30
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31 @property
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32 def page(self):
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33 return self._page
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34
226
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35 def get(self, name):
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36 try:
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37 return self._getValue(name)
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38 except LazyPageConfigLoaderHasNoValue:
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39 return None
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40
12
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41 def __getattr__(self, name):
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42 try:
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43 return self._getValue(name)
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44 except LazyPageConfigLoaderHasNoValue:
12
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45 raise AttributeError
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46
3
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47 def __getitem__(self, name):
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48 try:
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49 return self._getValue(name)
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50 except LazyPageConfigLoaderHasNoValue:
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51 raise KeyError
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52
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53 def _getValue(self, name):
3
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54 self._load()
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55
381
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56 if name in self._values:
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57 return self._values[name]
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58
3
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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 LazyPageConfigLoaderHasNoValue:
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65 raise
3
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66 except Exception as ex:
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67 raise Exception(
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68 "Error while loading attribute '%s' for: %s" %
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69 (name, self._page.rel_path)) from ex
3
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70
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71 # We need to double-check `_loaders` here because
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72 # the loader could have removed all loaders, which
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73 # would set this back to `None`.
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74 if self._loaders is not None:
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75 del self._loaders[name]
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76 if len(self._loaders) == 0:
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77 self._loaders = None
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78
381
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79 else:
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80 loader = self._loaders.get('*')
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81 if loader is not None:
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82 try:
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83 self._values[name] = loader(self, name)
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84 except LazyPageConfigLoaderHasNoValue:
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85 raise
236
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86 except Exception as ex:
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87 raise Exception(
381
4c9eab0e283b data: Fix problems with using non-existing metadata on a linked page.
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88 "Error while loading attribute '%s' for: %s" %
236
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89 (name, self._page.rel_path)) from ex
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90 # We always keep the wildcard loader in the loaders list.
236
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91
392
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92 if name not in self._values:
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93 raise LazyPageConfigLoaderHasNoValue()
3
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94 return self._values[name]
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95
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96 def _setValue(self, name, value):
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97 if self._values is None:
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98 raise Exception("Can't call _setValue before this data has been "
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99 "loaded")
3
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100 self._values[name] = value
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101
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102 def mapLoader(self, attr_name, loader):
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103 if loader is None:
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104 if self._loaders is None or attr_name not in self._loaders:
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105 return
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106 del self._loaders[attr_name]
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107 if len(self._loaders) == 0:
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108 self._loaders = None
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109 return
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110
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111 if self._loaders is None:
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112 self._loaders = {}
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113 if attr_name in self._loaders:
158
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114 raise Exception(
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115 "A loader has already been mapped for: %s" % attr_name)
3
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116 self._loaders[attr_name] = loader
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117
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118 def _load(self):
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119 if self._values is not None:
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120 return
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121 self._values = self._page.config.getDeepcopy(self._page.app.debug)
3
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122 try:
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123 self._loadCustom()
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124 except Exception as ex:
158
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125 raise Exception(
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126 "Error while loading data for: %s" %
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127 self._page.rel_path) from ex
3
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128
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129 def _loadCustom(self):
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130 pass
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131
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132 def _debugRenderKeys(self):
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133 self._load()
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134 keys = set(self._values.keys())
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135 if self._loaders:
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136 keys |= set(self._loaders.keys())
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137 return list(keys)
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138
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139
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140 class PaginationData(LazyPageConfigData):
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141 def __init__(self, page):
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142 super(PaginationData, self).__init__(page)
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143 self._route = None
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144 self._route_metadata = None
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145
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146 def _get_uri(self):
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147 page = self._page
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148 if self._route is None:
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149 # TODO: this is not quite correct, as we're missing parts of the
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150 # route metadata if the current page is a taxonomy page.
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151 self._route = page.app.getRoute(page.source.name,
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152 page.source_metadata)
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153 self._route_metadata = copy.deepcopy(page.source_metadata)
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154 if self._route is None:
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155 raise Exception("Can't get route for page: %s" % page.path)
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156 return self._route.getUri(self._route_metadata, provider=page)
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157
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158 def _loadCustom(self):
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159 page_url = self._get_uri()
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160 _, slug = split_uri(self.page.app, page_url)
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161 self._setValue('url', page_url)
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162 self._setValue('slug', slug)
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163 self._setValue(
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164 'timestamp',
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165 time.mktime(self.page.datetime.timetuple()))
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166 date_format = self.page.app.config.get('site/date_format')
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167 if date_format:
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168 self._setValue('date', self.page.datetime.strftime(date_format))
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169
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170 assetor = Assetor(self.page, page_url)
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171 self._setValue('assets', assetor)
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172
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173 segment_names = self.page.config.get('segments')
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174 for name in segment_names:
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175 self.mapLoader(name, self._load_rendered_segment)
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176
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177 def _load_rendered_segment(self, data, name):
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178 do_render = True
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179 eis = self._page.app.env.exec_info_stack
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180 if eis is not None and eis.hasPage(self._page):
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181 # This is the pagination data for the page that is currently
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182 # being rendered! Inception! But this is possible... so just
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183 # prevent infinite recursion.
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184 do_render = False
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185
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186 assert self is data
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187
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188 if do_render:
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189 uri = self._get_uri()
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190 try:
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191 from piecrust.rendering import (
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192 QualifiedPage, PageRenderingContext,
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193 render_page_segments)
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194 qp = QualifiedPage(self._page, self._route,
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195 self._route_metadata)
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196 ctx = PageRenderingContext(qp)
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197 segs = render_page_segments(ctx)
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198 except Exception as e:
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199 raise Exception(
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200 "Error rendering segments for '%s'" % uri) from e
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201 else:
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202 segs = {}
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203 for name in self.page.config.get('segments'):
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204 segs[name] = "<unavailable: current page>"
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205
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206 for k, v in segs.items():
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207 self.mapLoader(k, None)
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208 self._setValue(k, v)
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209
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210 if 'content.abstract' in segs:
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211 self._setValue('content', segs['content.abstract'])
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212 self._setValue('has_more', True)
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213 if name == 'content':
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214 return segs['content.abstract']
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215
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216 return segs[name]
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217