Mercurial > piecrust2

annotate piecrust/data/base.py @ 72:ecee3e8f35e5

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Fix `setuptools` install.
author Ludovic Chabant <ludovic@chabant.com>
date Sat, 30 Aug 2014 09:46:37 -0700
parents 30a42341cfa8
children ab6e7e0e9d44
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
3
f485ba500df3 Gigantic change to basically make PieCrust 2 vaguely functional.
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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
6
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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
12
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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:
12
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65 raise Exception("Error while loading attribute '%s' for: %s"
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66 % (name, self._page.rel_path)) from ex
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67
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68 # We need to double-check `_loaders` here because
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69 # the loader could have removed all loaders, which
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70 # would set this back to `None`.
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71 if self._loaders is not None:
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72 del self._loaders[name]
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73 if len(self._loaders) == 0:
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74 self._loaders = None
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75
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76 return self._values[name]
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77
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78 def setValue(self, name, value):
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79 self._values[name] = value
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80
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81 def mapLoader(self, attr_name, loader):
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82 if loader is None:
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83 if self._loaders is None or attr_name not in self._loaders:
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84 return
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85 del self._loaders[attr_name]
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86 if len(self._loaders) == 0:
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87 self._loaders = None
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88 return
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89
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90 if self._loaders is None:
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91 self._loaders = {}
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92 if attr_name in self._loaders:
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93 raise Exception("A loader has already been mapped for: %s" %
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94 attr_name)
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95 self._loaders[attr_name] = loader
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96
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97 def _load(self):
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98 if self._values is not None:
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99 return
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100 self._values = dict(self._page.config.get())
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101 try:
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102 self._loadCustom()
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103 except Exception as ex:
12
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104 raise Exception("Error while loading data for: %s" % self._page.rel_path) from ex
3
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105
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106 def _loadCustom(self):
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107 pass
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108
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109 def _debugRenderKeys(self):
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110 self._load()
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111 keys = set(self._values.keys())
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112 if self._loaders:
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113 keys |= set(self._loaders.keys())
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114 return list(keys)
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115
3
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116
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117 class PaginationData(LazyPageConfigData):
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118 def __init__(self, page):
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119 super(PaginationData, self).__init__(page)
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120
6
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121 def _get_uri(self):
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122 page = self._page
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123 route = page.app.getRoute(page.source.name, page.source_metadata)
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124 if route is None:
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125 raise Exception("Can't get route for page: %s" % page.path)
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126 return route.getUri(page.source_metadata)
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127
3
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128 def _loadCustom(self):
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129 page_url = self._get_uri()
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130 self.setValue('url', page_url)
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131 self.setValue('slug', get_slug(self._page.app, page_url))
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132 self.setValue('timestamp',
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133 time.mktime(self.page.datetime.timetuple()))
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134 date_format = self.page.app.config.get('site/date_format')
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135 if date_format:
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136 self.setValue('date', self.page.datetime.strftime(date_format))
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137
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138 assetor = Assetor(self.page, page_url)
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139 self.setValue('assets', assetor)
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140
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141 segment_names = self.page.config.get('segments')
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142 for name in segment_names:
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143 self.mapLoader(name, self._load_rendered_segment)
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144
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145 def _load_rendered_segment(self, data, name):
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146 do_render = True
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147 eis = self._page.app.env.exec_info_stack
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148 if eis is not None and eis.hasPage(self._page):
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149 # This is the pagination data for the page that is currently
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150 # being rendered! Inception! But this is possible... so just
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151 # prevent infinite recursion.
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152 do_render = False
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153
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154 assert self is data
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155
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156 if do_render:
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157 uri = self._get_uri()
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158 try:
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159 from piecrust.rendering import (PageRenderingContext,
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160 render_page_segments)
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161 ctx = PageRenderingContext(self._page, uri)
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162 segs = render_page_segments(ctx)
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163 except Exception as e:
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164 raise Exception("Error rendering segments for '%s'" % uri) from e
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165 else:
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166 segs = {}
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167 for name in self.page.config.get('segments'):
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168 segs[name] = "<unavailable: current page>"
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169
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170 for k, v in segs.items():
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171 self.mapLoader(k, None)
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172 self.setValue(k, v)
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173
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174 if 'content.abstract' in segs:
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175 self.setValue('content', segs['content.abstract'])
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176 self.setValue('has_more', True)
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177 if name == 'content':
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178 return segs['content.abstract']
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179
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180 return segs[name]
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181