Mercurial > piecrust2

annotate piecrust/data/linker.py @ 966:cc55740860de

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data: Delay loading page configuration and datetimes.
author Ludovic Chabant <ludovic@chabant.com>
date Sat, 07 Oct 2017 12:32:48 -0700
parents d9059257743c
children 84fc72a17f7a
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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_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 ancestors(self):
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45 if self._ancestors is None:
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46 self._ensureParentGroup()
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47
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48 src = self._source
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49 app = src.app
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50
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51 cur_group = self._parent_group
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52 self._ancestors = []
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53 while cur_group:
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54 pi = src.getRelatedContents(cur_group,
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55 REL_LOGICAL_PARENT_ITEM)
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56 if pi is not None:
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57 pipage = app.getPage(src, pi)
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58 self._ancestors.append(PaginationData(pipage))
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59 cur_group = src.getParentGroup(pi)
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60 else:
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61 break
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62 return self._ancestors
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63
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64 @property
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65 def siblings(self):
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66 if self._siblings is None:
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67 self._ensureParentGroup()
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68
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69 src = self._source
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70 app = src.app
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71
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72 self._siblings = []
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73 for i in src.getContents(self._parent_group):
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74 if not i.is_group:
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75 ipage = app.getPage(src, i)
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76 self._siblings.append(PaginationData(ipage))
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77 return self._siblings
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78
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79 @property
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80 def children(self):
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81 if self._children is None:
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82 src = self._source
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83 app = src.app
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84
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85 self._children = []
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86 child_group = src.getRelatedContents(self._content_item,
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87 REL_LOGICAl_CHILD_GROUP)
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88 if child_group:
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89 for i in src.getContents(child_group):
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90 ipage = app.getPage(src, i)
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91 self._children.append(PaginationData(ipage))
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92 return self._children
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93
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94 def forpath(self, path):
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95 # TODO: generalize this for sources that aren't file-system based.
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96 item = self._source.findContent({'slug': path})
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97 return Linker(self._source, item)
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98
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99 def childrenof(self, path):
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100 # TODO: generalize this for sources that aren't file-system based.
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101 src = self._source
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102 app = src.app
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103 group = src.findGroup(path)
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104 if group is not None:
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105 for i in src.getContents(group):
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106 if not i.is_group:
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107 ipage = app.getPage(src, i)
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108 yield PaginationData(ipage)
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109 return None
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110
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111 def _ensureParentGroup(self):
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112 if self._parent_group is _unloaded:
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113 src = self._source
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114 item = self._content_item
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115 self._parent_group = src.getParentGroup(item)
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116
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117 def _debugRenderAncestors(self):
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118 return [i.title for i in self.ancestors]
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119
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120 def _debugRenderSiblings(self):
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121 return [i.title for i in self.siblings]
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122
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123 def _debugRenderChildren(self):
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124 return [i.title for i in self.children]
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125