Mercurial > piecrust2

annotate piecrust/data/linker.py @ 182:a54d3c0b5f4a

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tests: Patch `os.path.exists` and improve patching for `open`. You can specify additional modules for which to patch `open`. Also, it was incorrectly updating the opened file, even when it was opened for read only. Now it only updates the contents if the file was opened for write, and supports appending to the end. Last, it supports opening text files in binary mode.
author Ludovic Chabant <ludovic@chabant.com>
date Sun, 04 Jan 2015 14:55:41 -0800
parents 4fc1d306046b
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.
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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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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
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21
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22
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23 class Linker(object):
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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
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62
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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