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annotate piecrust/data/linker.py @ 172:4fc1d306046b

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linker: Actually implement the `Linker` class, and use it in the page data.
author Ludovic Chabant <ludovic@chabant.com>
date Sat, 03 Jan 2015 20:52:19 -0800
parents f485ba500df3
children 701591ebfcba
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
172
4fc1d306046b linker: Actually implement the `Linker` class, and use it in the page data.
Ludovic Chabant <ludovic@chabant.com>
parents: 3
diff changeset
1 import logging
4fc1d306046b linker: Actually implement the `Linker` class, and use it in the page data.
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diff changeset
2 import collections
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3 from piecrust.data.base import PaginationData
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4 from piecrust.sources.base import IListableSource, build_pages
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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 class LinkedPageData(PaginationData):
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11 debug_render = ['name', 'is_dir', 'is_self']
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12
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13 def __init__(self, name, page, is_self=False):
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14 super(LinkedPageData, self).__init__(page)
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15 self.name = name
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16 self.is_self = is_self
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17
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18 @property
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19 def is_dir(self):
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20 return False
3
f485ba500df3 Gigantic change to basically make PieCrust 2 vaguely functional.
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21
f485ba500df3 Gigantic change to basically make PieCrust 2 vaguely functional.
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22
f485ba500df3 Gigantic change to basically make PieCrust 2 vaguely functional.
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23 class Linker(object):
172
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24 debug_render_doc = """Provides access to sibling and children pages."""
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25
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26 def __init__(self, source, *, name=None, dir_path=None, page_path=None):
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27 self.source = source
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28 self._name = name
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29 self._dir_path = dir_path
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30 self._root_page_path = page_path
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31 self._cache = None
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32 self._is_listable = None
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33
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34 def __iter__(self):
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35 self._load()
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36 return iter(self._cache.values())
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37
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38 def __getattr__(self, name):
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39 self._load()
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40 try:
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41 return self._cache[name]
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42 except KeyError:
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43 raise AttributeError()
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44
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45 @property
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46 def name(self):
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47 if not self._name:
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48 self._load()
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49 return self._name
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50
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51 @property
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52 def is_dir(self):
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53 return True
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54
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55 @property
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56 def is_self(self):
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57 return False
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58
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59 def _load(self):
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60 if self._cache is not None:
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61 return
3
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62
172
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63 self._is_listable = isinstance(self.source, IListableSource)
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64 if self._is_listable and self._root_page_path is not None:
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65 if self._name is None:
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66 self._name = self.source.getBasename(self._root_page_path)
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67 if self._dir_path is None:
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68 self._dir_path = self.source.getDirpath(self._root_page_path)
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69
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70 self._cache = collections.OrderedDict()
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71 if not self._is_listable or self._dir_path is None:
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72 return
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73
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74 items = self.source.listPath(self._dir_path)
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75 with self.source.app.env.page_repository.startBatchGet():
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76 for is_dir, name, data in items:
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77 if is_dir:
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78 self._cache[name] = Linker(self.source,
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79 name=name, dir_path=data)
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80 else:
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81 page = data.buildPage()
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82 is_root_page = (self._root_page_path == data.rel_path)
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83 self._cache[name] = LinkedPageData(name, page,
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84 is_root_page)
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85
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86
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87 class RecursiveLinker(Linker):
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88 def __init__(self, source, page_path):
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89 super(RecursiveLinker, self).__init__(source, page_path=page_path)
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90
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91 def __iter__(self):
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92 self._load()
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93 if not self._is_listable:
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94 return
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95 yield from walk_linkers(self)
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96
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97
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98 def walk_linkers(linker):
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99 linker._load()
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100 for item in linker._cache.values():
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101 if item.is_dir:
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102 yield from walk_linkers(item)
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103 else:
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104 yield item
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105