Mercurial > piecrust2

annotate piecrust/data/linker.py @ 1055:7e4742a60d14

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data: Add new properties and folder support to the `family` data endpoint. * Add `root` and `myself`. * Return groups as part of the children.
author Ludovic Chabant <ludovic@chabant.com>
date Wed, 31 Jan 2018 08:53:27 -0800
parents 8adc27285d93
children f6b975db2545
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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diff changeset
1 import logging
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2 from piecrust.data.paginationdata import PaginationData
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3 from piecrust.sources.base import (
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4 REL_PARENT_GROUP, REL_LOGICAL_PARENT_ITEM, REL_LOGICAl_CHILD_GROUP)
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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 _unloaded = object()
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11
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12
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13 class Linker:
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14 """ A template-exposed data class that lets the user navigate the
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15 logical hierarchy of pages in a page source.
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16 """
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17 debug_render = ['parent', 'ancestors', 'siblings', 'children', 'root',
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18 'forpath']
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19 debug_render_invoke = ['parent', 'ancestors', 'siblings', 'children',
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20 'root']
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21 debug_render_redirect = {
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22 'ancestors': '_debugRenderAncestors',
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23 'siblings': '_debugRenderSiblings',
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24 'children': '_debugRenderChildren',
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25 'root': '_debugRenderRoot'}
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26
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27 def __init__(self, source, content_item):
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28 self._source = source
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29 self._content_item = content_item
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30
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31 self._parent_group = _unloaded
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32 self._ancestors = None
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33 self._siblings = None
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34 self._children = None
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35
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36 @property
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37 def parent(self):
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38 a = self.ancestors
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39 if a:
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40 return a[0]
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41 return None
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42
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43 @property
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44 def root(self):
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45 a = self.ancestors
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46 if a:
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47 return a[-1]
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48 return self.myself
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49
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50 @property
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51 def myself(self):
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52 page = self._source.app.getPage(self._source, self._content_item)
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53 return self._makePageData(page)
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54
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55 @property
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56 def ancestors(self):
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57 if self._ancestors is None:
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58 src = self._source
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59 app = src.app
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60
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61 self._ancestors = []
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62 cur_group = self._getParentGroup()
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63 while cur_group:
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64 pi = src.getRelatedContents(cur_group,
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65 REL_LOGICAL_PARENT_ITEM)
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66 if pi is not None:
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67 pipage = app.getPage(src, pi)
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68 self._ancestors.append(self._makePageData(pipage))
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69 cur_group = src.getRelatedContents(
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70 pi, REL_PARENT_GROUP)
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71 else:
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72 break
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73 return self._ancestors
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74
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75 @property
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76 def siblings(self):
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77 src = self._source
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78 app = src.app
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79 for i in self._getAllSiblings():
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80 if not i.is_group:
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81 ipage = app.getPage(src, i)
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82 ipage_data = self._makePageData(ipage)
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83 yield ipage_data
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84 else:
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85 yield self._makeGroupData(i)
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86
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87 @property
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88 def has_children(self):
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89 return bool(self.children)
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90
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91 @property
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92 def children(self):
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93 src = self._source
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94 app = src.app
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95 for i in self._getAllChildren():
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96 if not i.is_group:
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97 ipage = app.getPage(src, i)
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98 yield self._makePageData(ipage)
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99 else:
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100 yield self._makeGroupData(i)
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101
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102 def forpath(self, path):
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103 # TODO: generalize this for sources that aren't file-system based.
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104 item = self._source.findContentFromSpec({'slug': path})
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105 return Linker(self._source, item)
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106
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107 def childrenof(self, path):
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108 # TODO: generalize this for sources that aren't file-system based.
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109 src = self._source
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110 app = src.app
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111 group = src.findContentFromSpec(path)
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112 if group is not None:
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113 if not group.is_group:
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114 raise Exception("'%s' is not a folder/group." % path)
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115 for i in src.getContents(group):
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116 if not i.is_group:
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117 ipage = app.getPage(src, i)
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118 yield self._makePageData(ipage)
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119 else:
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120 yield self._makeGroupData(i)
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121 return None
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122
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123 def _getAllSiblings(self):
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124 if self._siblings is None:
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125 self._siblings = list(self._source.getContents(
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126 self._getParentGroup()))
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127 return self._siblings
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128
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129 def _getAllChildren(self):
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130 if self._children is None:
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131 child_group = self._source.getRelatedContents(
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132 self._content_item, REL_LOGICAl_CHILD_GROUP)
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133 if child_group is not None:
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134 self._children = list(
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135 self._source.getContents(child_group))
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136 else:
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137 self._children = []
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138 return self._children
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139
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140 def _getParentGroup(self):
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141 if self._parent_group is _unloaded:
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142 self._parent_group = self._source.getRelatedContents(
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143 self._content_item, REL_PARENT_GROUP)
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144 return self._parent_group
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145
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146 def _makePageData(self, page):
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147 return _PageData(self, page)
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148
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149 def _makeGroupData(self, group):
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150 return _GroupData(self._source, group)
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151
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152 def _debugRenderAncestors(self):
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153 return [i.title for i in self.ancestors]
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154
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155 def _debugRenderSiblings(self):
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156 return [i.title for i in self.siblings]
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157
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158 def _debugRenderChildren(self):
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159 return [i.title for i in self.children]
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160
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161
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162 class _PageData(PaginationData):
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163 def __init__(self, linker, page):
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164 super().__init__(page)
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165 self._linker = linker
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166
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167 def _load(self):
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168 super()._load()
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169 self._mapValue('is_page', True)
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170 self._mapValue(
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171 'is_self',
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172 self._page.content_spec == self._linker._content_item.spec)
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173
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174 self._mapLoader('is_dir', lambda d, n: self._linker.has_children)
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175 self._mapLoader('is_group', lambda d, n: self._linker.has_children)
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176
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177
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178 class _GroupData:
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179 def __init__(self, source, group_item):
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180 self._source = source
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181 self._group_item = group_item
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182 self.is_page = False
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183 self.is_dir = True
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184 self.is_group = True
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185 self.family = Linker(source, group_item)