Mercurial > piecrust2

annotate piecrust/data/linker.py @ 227:d6d0e4976beb

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data: Make the `Linekr` use the new `getSettingAccessor` API.
author Ludovic Chabant <ludovic@chabant.com>
date Wed, 04 Feb 2015 23:50:24 -0800
parents 701591ebfcba
children 879fe1457e48
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
172
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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 LinkerSource(IPaginationSource):
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25 def __init__(self, pages):
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26 self._pages = pages
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27
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28 def getItemsPerPage(self):
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29 raise NotImplementedError()
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30
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31 def getSourceIterator(self):
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32 return self._pages
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33
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34 def getSorterIterator(self, it):
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35 return None
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36
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37 def getTailIterator(self, it):
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38 return None
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39
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40 def getPaginationFilter(self, page):
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41 return None
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42
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43 def getSettingAccessor(self):
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44 return lambda i, n: i.get(n)
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45
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46
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47 class LinkedPageDataIterator(object):
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48 def __init__(self, items):
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49 self._items = list(items)
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50 self._index = -1
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51
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52 def __iter__(self):
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53 return self
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54
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55 def __next__(self):
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56 self._index += 1
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57 if self._index >= len(self._items):
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58 raise StopIteration()
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59 return self._items[self._index]
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60
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61 def sort(self, name):
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62 def key_getter(item):
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63 return item[name]
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64 self._items = sorted(self._item, key=key_getter)
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65 return self
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66
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67
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68 class Linker(object):
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69 debug_render_doc = """Provides access to sibling and children pages."""
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70
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71 def __init__(self, source, *, name=None, dir_path=None, page_path=None):
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72 self.source = source
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73 self._name = name
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74 self._dir_path = dir_path
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75 self._root_page_path = page_path
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76 self._cache = None
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77 self._is_listable = None
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78
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79 def __iter__(self):
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80 self._load()
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81 return LinkedPageDataIterator(self._cache.values())
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82
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83 def __getattr__(self, name):
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84 self._load()
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85 try:
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86 return self._cache[name]
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87 except KeyError:
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88 raise AttributeError()
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89
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90 @property
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91 def name(self):
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92 if not self._name:
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93 self._load()
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94 return self._name
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95
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96 @property
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97 def is_dir(self):
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98 return True
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99
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100 @property
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101 def is_self(self):
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102 return False
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103
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104 def _load(self):
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105 if self._cache is not None:
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106 return
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107
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108 self._is_listable = isinstance(self.source, IListableSource)
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109 if self._is_listable and self._root_page_path is not None:
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110 if self._name is None:
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111 self._name = self.source.getBasename(self._root_page_path)
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112 if self._dir_path is None:
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113 self._dir_path = self.source.getDirpath(self._root_page_path)
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114
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115 self._cache = collections.OrderedDict()
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116 if not self._is_listable or self._dir_path is None:
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117 return
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118
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119 items = self.source.listPath(self._dir_path)
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120 with self.source.app.env.page_repository.startBatchGet():
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121 for is_dir, name, data in items:
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122 if is_dir:
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123 self._cache[name] = Linker(self.source,
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124 name=name, dir_path=data)
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125 else:
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126 page = data.buildPage()
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127 is_root_page = (self._root_page_path == data.rel_path)
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128 self._cache[name] = LinkedPageData(name, page,
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129 is_root_page)
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130
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131
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132 class RecursiveLinker(Linker):
212
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133 def __init__(self, source, *args, **kwargs):
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134 super(RecursiveLinker, self).__init__(source, *args, **kwargs)
172
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135
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136 def __iter__(self):
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137 return iter(self.pages)
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138
227
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139 def __getattr__(self, name):
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140 if name == 'pages':
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141 return self.getpages()
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142 if name == 'siblings':
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143 return self.getsiblings()
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144 raise AttributeError()
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145
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146 def getpages(self):
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147 src = LinkerSource(self._iterateLinkers())
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148 return PageIterator(src)
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149
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150 def getsiblings(self):
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151 src = LinkerSource(self._iterateLinkers(0))
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152 return PageIterator(src)
212
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153
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154 def frompath(self, rel_path):
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155 return RecursiveLinker(self.source, name='.', dir_path=rel_path)
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156
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157 def _iterateLinkers(self, max_depth=-1):
172
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158 self._load()
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159 if not self._is_listable:
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160 return
212
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161 yield from walk_linkers(self, 0, max_depth)
172
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162
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163
212
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164 def walk_linkers(linker, depth=0, max_depth=-1):
172
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165 linker._load()
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166 for item in linker._cache.values():
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167 if item.is_dir:
212
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168 if max_depth < 0 or depth + 1 <= max_depth:
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169 yield from walk_linkers(item, depth + 1, max_depth)
172
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170 else:
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171 yield item
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172