Mercurial > piecrust2

annotate piecrust/data/linker.py @ 220:84e2bc2d16cb

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bake: Change arguments to selectively bake to make them symmetrical.
author Ludovic Chabant <ludovic@chabant.com>
date Tue, 03 Feb 2015 08:20:30 -0800
parents 701591ebfcba
children d6d0e4976beb
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rev   line source
172
4fc1d306046b linker: Actually implement the `Linker` class, and use it in the page data.
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diff changeset
1 import logging
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2 import collections
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3 from piecrust.data.base import PaginationData, IPaginationSource
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4 from piecrust.data.iterators import PageIterator
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5 from piecrust.sources.base import IListableSource, build_pages
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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 LinkedPageData(PaginationData):
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12 debug_render = ['name', 'is_dir', 'is_self']
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13
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14 def __init__(self, name, page, is_self=False):
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15 super(LinkedPageData, self).__init__(page)
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16 self.name = name
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17 self.is_self = is_self
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18
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19 @property
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20 def is_dir(self):
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21 return False
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23
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24 class LinkedPageDataIterator(object):
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25 def __init__(self, items):
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26 self._items = list(items)
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27 self._index = -1
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28
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29 def __iter__(self):
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30 return self
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31
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32 def __next__(self):
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33 self._index += 1
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34 if self._index >= len(self._items):
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35 raise StopIteration()
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36 return self._items[self._index]
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37
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38 def sort(self, name):
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39 def key_getter(item):
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40 return item[name]
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41 self._items = sorted(self._item, key=key_getter)
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42 return self
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43
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44
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45 class Linker(object):
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46 debug_render_doc = """Provides access to sibling and children pages."""
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47
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48 def __init__(self, source, *, name=None, dir_path=None, page_path=None):
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49 self.source = source
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50 self._name = name
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51 self._dir_path = dir_path
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52 self._root_page_path = page_path
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53 self._cache = None
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54 self._is_listable = None
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55
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56 def __iter__(self):
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57 self._load()
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58 return LinkedPageDataIterator(self._cache.values())
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59
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60 def __getattr__(self, name):
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61 self._load()
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62 try:
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63 return self._cache[name]
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64 except KeyError:
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65 raise AttributeError()
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66
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67 @property
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68 def name(self):
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69 if not self._name:
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70 self._load()
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71 return self._name
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72
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73 @property
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74 def is_dir(self):
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75 return True
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76
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77 @property
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78 def is_self(self):
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79 return False
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80
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81 def _load(self):
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82 if self._cache is not None:
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83 return
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84
172
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85 self._is_listable = isinstance(self.source, IListableSource)
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86 if self._is_listable and self._root_page_path is not None:
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87 if self._name is None:
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88 self._name = self.source.getBasename(self._root_page_path)
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89 if self._dir_path is None:
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90 self._dir_path = self.source.getDirpath(self._root_page_path)
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91
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92 self._cache = collections.OrderedDict()
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93 if not self._is_listable or self._dir_path is None:
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94 return
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95
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96 items = self.source.listPath(self._dir_path)
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97 with self.source.app.env.page_repository.startBatchGet():
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98 for is_dir, name, data in items:
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99 if is_dir:
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100 self._cache[name] = Linker(self.source,
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101 name=name, dir_path=data)
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102 else:
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103 page = data.buildPage()
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104 is_root_page = (self._root_page_path == data.rel_path)
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105 self._cache[name] = LinkedPageData(name, page,
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106 is_root_page)
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107
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108
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109 class RecursiveLinker(Linker):
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110 def __init__(self, source, *args, **kwargs):
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111 super(RecursiveLinker, self).__init__(source, *args, **kwargs)
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112
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113 def __iter__(self):
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114 return iter(PageIterator(self._iterateLinkers()))
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115
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116 def siblings(self):
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117 return PageIterator(self._iterateLinkers(0))
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118
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119 def frompath(self, rel_path):
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120 return RecursiveLinker(self.source, name='.', dir_path=rel_path)
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121
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122 def _iterateLinkers(self, max_depth=-1):
172
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123 self._load()
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124 if not self._is_listable:
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125 return
212
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126 yield from walk_linkers(self, 0, max_depth)
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127
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128
212
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129 def walk_linkers(linker, depth=0, max_depth=-1):
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130 linker._load()
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parents: 3
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131 for item in linker._cache.values():
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132 if item.is_dir:
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133 if max_depth < 0 or depth + 1 <= max_depth:
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parents: 172
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134 yield from walk_linkers(item, depth + 1, max_depth)
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135 else:
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136 yield item
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137