Mercurial > piecrust2

annotate piecrust/data/linker.py @ 238:4dce0e61b48c

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internal: Fix bug with the default source when listing `/` path.
author Ludovic Chabant <ludovic@chabant.com>
date Sun, 15 Feb 2015 22:47:46 -0800
parents 879fe1457e48
children f130365568ff
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 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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7
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8 logger = logging.getLogger(__name__)
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11 class LinkedPageData(PaginationData):
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12 """ Class whose instances get returned when iterating on a `Linker`
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13 or `RecursiveLinker`. It's just like what gets usually returned by
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14 `Paginator` and other page iterators, but with a few additional data
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15 like hierarchical data.
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16 """
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17 debug_render = ['is_dir', 'is_self'] + PaginationData.debug_render
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18
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19 def __init__(self, page):
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20 super(LinkedPageData, self).__init__(page)
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21 self.name = page.config.get('__linker_name')
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22 self.is_self = page.config.get('__linker_is_self')
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23 self.children = page.config.get('__linker_child')
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24 self.is_dir = (self.children is not None)
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25 self.is_page = True
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26
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27 self.mapLoader('*', self._linkerChildLoader)
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28
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29 def _linkerChildLoader(self, name):
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30 return getattr(self.children, name)
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31
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32
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33 class LinkedPageDataBuilderIterator(object):
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34 """ Iterator that builds `LinkedPageData` out of pages.
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35 """
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36 def __init__(self, it):
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37 self.it = it
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38
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39 def __iter__(self):
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40 for item in self.it:
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41 yield LinkedPageData(item)
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43
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44 class LinkerSource(IPaginationSource):
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45 """ Source iterator that returns pages given by `Linker`.
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46 """
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47 def __init__(self, pages, orig_source):
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48 self._pages = list(pages)
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49 self._orig_source = None
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50 if isinstance(orig_source, IPaginationSource):
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51 self._orig_source = orig_source
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52
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53 def getItemsPerPage(self):
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54 raise NotImplementedError()
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55
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56 def getSourceIterator(self):
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57 return self._pages
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58
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59 def getSorterIterator(self, it):
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60 # We don't want to sort the pages -- we expect the original source
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61 # to return hierarchical items in the order it wants already.
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62 return None
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63
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64 def getTailIterator(self, it):
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65 return LinkedPageDataBuilderIterator(it)
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66
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67 def getPaginationFilter(self, page):
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68 return None
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69
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70 def getSettingAccessor(self):
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71 if self._orig_source:
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72 return self._orig_source.getSettingAccessor()
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73 return None
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75
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76 class Linker(object):
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77 debug_render_doc = """Provides access to sibling and children pages."""
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78
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79 def __init__(self, source, *, name=None, dir_path=None, page_path=None):
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80 self._source = source
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81 self._name = name
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82 self._dir_path = dir_path
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83 self._root_page_path = page_path
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84 self._items = None
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85
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86 self.is_dir = True
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87 self.is_page = False
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88 self.is_self = False
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89
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90 def __iter__(self):
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91 return iter(self.pages)
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92
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93 def __getattr__(self, name):
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94 self._load()
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95 try:
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96 item = self._items[name]
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97 except KeyError:
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98 raise AttributeError()
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99
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100 if isinstance(item, Linker):
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101 return item
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102
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103 return LinkedPageData(item)
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104
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105 @property
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106 def name(self):
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107 if self._name is None:
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108 self._load()
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109 return self._name
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110
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111 @property
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112 def children(self):
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113 return self._iterItems(0)
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114
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115 @property
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116 def pages(self):
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117 return self._iterItems(0, filter_page_items)
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118
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119 @property
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120 def directories(self):
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121 return self._iterItems(0, filter_directory_items)
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122
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123 @property
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124 def all(self):
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125 return self._iterItems()
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126
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127 @property
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128 def allpages(self):
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129 return self._iterItems(-1, filter_page_items)
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130
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131 @property
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132 def alldirectories(self):
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133 return self._iterItems(-1, filter_directory_items)
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134
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135 @property
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136 def root(self):
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137 return self.forpath('/')
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138
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139 def forpath(self, rel_path):
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140 return Linker(self._source,
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141 name='.', dir_path=rel_path,
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142 page_path=self._root_page_path)
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143
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144 def _iterItems(self, max_depth=-1, filter_func=None):
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145 items = walk_linkers(self, max_depth=max_depth,
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146 filter_func=filter_func)
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147 src = LinkerSource(items, self._source)
227
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148 return PageIterator(src)
212
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149
237
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150 def _load(self):
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151 if self._items is not None:
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152 return
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153
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154 is_listable = isinstance(self._source, IListableSource)
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155 if not is_listable:
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156 raise Exception("Source '%s' can't be listed." % self._source.name)
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157
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158 if self._root_page_path is not None:
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159 if self._name is None:
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160 self._name = self._source.getBasename(self._root_page_path)
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161 if self._dir_path is None:
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162 self._dir_path = self._source.getDirpath(self._root_page_path)
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163
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164 if self._dir_path is None:
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165 raise Exception("This linker has no directory to start from.")
212
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166
237
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167 items = list(self._source.listPath(self._dir_path))
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168 self._items = collections.OrderedDict()
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169 with self._source.app.env.page_repository.startBatchGet():
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170 for is_dir, name, data in items:
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171 # If `is_dir` is true, `data` will be the directory's source
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172 # path. If not, it will be a page factory.
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173 if is_dir:
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174 item = Linker(self._source,
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175 name=name, dir_path=data)
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176 else:
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177 item = data.buildPage()
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178 item.config.set('__linker_name', name)
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179 item.config.set('__linker_is_self',
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180 item.rel_path == self._root_page_path)
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181
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182 existing = self._items.get(name)
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183 if existing is None:
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184 self._items[name] = item
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185 elif is_dir:
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186 # The current item is a directory. The existing item
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187 # should be a page.
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188 existing.config.set('__linker_child', item)
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189 else:
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190 # The current item is a page. The existing item should
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191 # be a directory.
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192 item.config.set('__linker_child', existing)
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193 self._items[name] = item
172
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194
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195
237
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196 def filter_page_items(item):
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197 return not isinstance(item, Linker)
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198
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199
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200 def filter_directory_items(item):
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201 return isinstance(item, linker)
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202
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203
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204 def walk_linkers(linker, depth=0, max_depth=-1, filter_func=None):
172
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205 linker._load()
237
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206 for item in linker._items.values():
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207 if not filter_func or filter_func(item):
172
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208 yield item
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209
237
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210 if (isinstance(item, Linker) and
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211 (max_depth < 0 or depth + 1 <= max_depth)):
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212 yield from walk_linkers(item, depth + 1, max_depth)
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213