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annotate piecrust/sources/base.py @ 815:69d16e1afb95

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internal: Keep things out of the `PieCrust` class, and other clean-ups.
author Ludovic Chabant <ludovic@chabant.com>
date Wed, 11 Jan 2017 09:01:01 -0800
parents aca04e175488
children c30574f0dadc
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rev   line source
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diff changeset
1 import copy
3
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2 import logging
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3 from werkzeug.utils import cached_property
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4 from piecrust.page import Page
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5
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6
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7 REALM_USER = 0
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8 REALM_THEME = 1
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9 REALM_NAMES = {
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10 REALM_USER: 'User',
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11 REALM_THEME: 'Theme'}
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12
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13
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14 MODE_PARSING = 0
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15 MODE_CREATING = 1
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16
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17
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18 logger = logging.getLogger(__name__)
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19
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20
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21 def build_pages(app, factories):
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22 for f in factories:
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23 yield f.buildPage()
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25
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26 class SourceNotFoundError(Exception):
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27 pass
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29
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30 class InvalidFileSystemEndpointError(Exception):
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31 def __init__(self, source_name, fs_endpoint):
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32 super(InvalidFileSystemEndpointError, self).__init__(
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33 "Invalid file-system endpoint for source '%s': %s" %
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34 (source_name, fs_endpoint))
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35
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36
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37 class PageFactory(object):
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38 """ A class responsible for creating a page.
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39 """
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40 def __init__(self, source, rel_path, metadata):
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41 self.source = source
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42 self.rel_path = rel_path
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43 self.metadata = metadata
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44
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45 @cached_property
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46 def ref_spec(self):
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47 return '%s:%s' % (self.source.name, self.rel_path)
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48
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49 @cached_property
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50 def path(self):
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51 path, _ = self.source.resolveRef(self.rel_path)
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52 return path
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53
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54 def buildPage(self):
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55 repo = self.source.app.env.page_repository
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56 if repo is not None:
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57 cache_key = '%s:%s' % (self.source.name, self.rel_path)
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58 return repo.get(cache_key, self._doBuildPage)
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59 return self._doBuildPage()
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60
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61 def _doBuildPage(self):
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62 logger.debug("Building page: %s" % self.path)
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63 page = Page(self.source, copy.deepcopy(self.metadata), self.rel_path)
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64 return page
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65
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66
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67 class PageSource(object):
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68 """ A source for pages, e.g. a directory with one file per page.
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69 """
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70 def __init__(self, app, name, config):
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71 self.app = app
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72 self.name = name
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73 self.config = config or {}
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74 self.config.setdefault('realm', REALM_USER)
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75 self._factories = None
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76 self._provider_type = None
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77
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78 def __getattr__(self, name):
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79 try:
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80 return self.config[name]
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81 except KeyError:
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82 raise AttributeError()
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83
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84 @property
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85 def is_theme_source(self):
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86 return self.realm == REALM_THEME
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87
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88 @property
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89 def root_dir(self):
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90 if self.is_theme_source:
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91 return self.app.theme_dir
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92 return self.app.root_dir
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93
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94 def getPages(self):
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95 return build_pages(self.app, self.getPageFactories())
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96
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97 def getPage(self, metadata):
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98 factory = self.findPageFactory(metadata, MODE_PARSING)
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99 if factory is None:
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100 return None
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101 return factory.buildPage()
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102
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103 def getPageFactories(self):
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104 if self._factories is None:
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105 self._factories = list(self.buildPageFactories())
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106 return self._factories
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107
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108 def getSupportedRouteParameters(self):
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109 raise NotImplementedError()
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110
3
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111 def buildPageFactories(self):
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112 raise NotImplementedError()
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113
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114 def buildPageFactory(self, path):
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115 raise NotImplementedError()
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116
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117 def resolveRef(self, ref_path):
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118 """ Returns the full path and source metadata given a source
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119 (relative) path, like a ref-spec.
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120 """
3
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121 raise NotImplementedError()
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122
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123 def findPageFactory(self, metadata, mode):
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124 raise NotImplementedError()
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125
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126 def buildDataProvider(self, page, override):
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127 if not self._provider_type:
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128 from piecrust.data.provider import get_data_provider_class
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129 self._provider_type = get_data_provider_class(self.app,
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130 self.data_type)
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131 return self._provider_type(self, page, override)