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annotate piecrust/sources/base.py @ 814:aca04e175488

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data: Allow page generators to have an associated data provider
author Ben Artin <ben@artins.org>
date Wed, 28 Dec 2016 01:27:02 -0500
parents 58ebf50235a5
children 69d16e1afb95
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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.configuration import ConfigurationError
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5 from piecrust.page import Page
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6
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7
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8 REALM_USER = 0
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9 REALM_THEME = 1
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10 REALM_NAMES = {
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11 REALM_USER: 'User',
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12 REALM_THEME: 'Theme'}
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13
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14
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15 MODE_PARSING = 0
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16 MODE_CREATING = 1
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17
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18
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19 logger = logging.getLogger(__name__)
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20
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21
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22 def build_pages(app, factories):
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23 for f in factories:
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24 yield f.buildPage()
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26
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27 class SourceNotFoundError(Exception):
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28 pass
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30
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31 class InvalidFileSystemEndpointError(Exception):
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32 def __init__(self, source_name, fs_endpoint):
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33 super(InvalidFileSystemEndpointError, self).__init__(
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34 "Invalid file-system endpoint for source '%s': %s" %
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35 (source_name, fs_endpoint))
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37
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38 class PageFactory(object):
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39 """ A class responsible for creating a page.
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40 """
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41 def __init__(self, source, rel_path, metadata):
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42 self.source = source
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43 self.rel_path = rel_path
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44 self.metadata = metadata
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45
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46 @cached_property
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47 def ref_spec(self):
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48 return '%s:%s' % (self.source.name, self.rel_path)
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49
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50 @cached_property
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51 def path(self):
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52 path, _ = self.source.resolveRef(self.rel_path)
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53 return path
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54
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55 def buildPage(self):
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56 repo = self.source.app.env.page_repository
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57 if repo is not None:
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58 cache_key = '%s:%s' % (self.source.name, self.rel_path)
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59 return repo.get(cache_key, self._doBuildPage)
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60 return self._doBuildPage()
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61
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62 def _doBuildPage(self):
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63 logger.debug("Building page: %s" % self.path)
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64 page = Page(self.source, copy.deepcopy(self.metadata), self.rel_path)
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65 return page
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67
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68 class PageSource(object):
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69 """ A source for pages, e.g. a directory with one file per page.
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70 """
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71 def __init__(self, app, name, config):
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72 self.app = app
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73 self.name = name
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74 self.config = config or {}
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75 self.config.setdefault('realm', REALM_USER)
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76 self._factories = None
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77 self._provider_type = None
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78
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79 def __getattr__(self, name):
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80 try:
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81 return self.config[name]
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82 except KeyError:
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83 raise AttributeError()
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84
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85 @property
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86 def is_theme_source(self):
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87 return self.realm == REALM_THEME
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88
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89 @property
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90 def root_dir(self):
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91 if self.is_theme_source:
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92 return self.app.theme_dir
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93 return self.app.root_dir
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94
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95 def getPages(self):
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96 return build_pages(self.app, self.getPageFactories())
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97
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98 def getPage(self, metadata):
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99 factory = self.findPageFactory(metadata, MODE_PARSING)
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100 if factory is None:
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101 return None
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102 return factory.buildPage()
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103
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104 def getPageFactories(self):
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105 if self._factories is None:
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106 self._factories = list(self.buildPageFactories())
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107 return self._factories
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108
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109 def getSupportedRouteParameters(self):
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110 raise NotImplementedError()
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111
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112 def buildPageFactories(self):
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113 raise NotImplementedError()
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114
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115 def buildPageFactory(self, path):
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116 raise NotImplementedError()
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117
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118 def resolveRef(self, ref_path):
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119 """ Returns the full path and source metadata given a source
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120 (relative) path, like a ref-spec.
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121 """
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122 raise NotImplementedError()
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123
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124 def findPageFactory(self, metadata, mode):
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125 raise NotImplementedError()
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126
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127 def buildDataProvider(self, page, override):
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128 if not self._provider_type:
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129 self._provider_type = self.app.getDataProviderClass(self.data_type)
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130 return self._provider_type(self, page, override)
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131