Mercurial > piecrust2

annotate piecrust/sources/base.py @ 318:ac9b94c8fb37

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internal: Add utility function to get a page from a source.
author Ludovic Chabant <ludovic@chabant.com>
date Sat, 28 Mar 2015 14:24:33 -0700
parents 88bffd469b04
children dd25bd3ce1f9
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3
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1 import logging
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2 from werkzeug.utils import cached_property
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3 from piecrust.configuration import ConfigurationError
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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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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 with app.env.page_repository.startBatchGet():
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23 for f in factories:
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24 yield f.buildPage()
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25
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26
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27 class InvalidFileSystemEndpointError(Exception):
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28 def __init__(self, source_name, fs_endpoint):
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29 super(InvalidFileSystemEndpointError, self).__init__(
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30 "Invalid file-system endpoint for source '%s': %s" %
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31 (source_name, fs_endpoint))
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32
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33
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34 class PageFactory(object):
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35 """ A class responsible for creating a page.
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36 """
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37 def __init__(self, source, rel_path, metadata):
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38 self.source = source
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39 self.rel_path = rel_path
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40 self.metadata = metadata
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41
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2fec3ee1298f Properly override pages between realms.
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42 @cached_property
3
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43 def ref_spec(self):
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44 return '%s:%s' % (self.source.name, self.rel_path)
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45
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46 @cached_property
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47 def path(self):
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48 return self.source.resolveRef(self.rel_path)
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49
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50 def buildPage(self):
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51 repo = self.source.app.env.page_repository
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52 if repo is not None:
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53 cache_key = '%s:%s' % (self.source.name, self.rel_path)
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54 return repo.get(cache_key, self._doBuildPage)
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55 return self._doBuildPage()
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56
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57 def _doBuildPage(self):
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58 logger.debug("Building page: %s" % self.path)
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59 page = Page(self.source, self.metadata, self.rel_path)
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60 # Load it right away, especially when using the page repository,
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61 # because we'll be inside a critical scope.
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62 page._load()
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63 return page
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64
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65
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66 class PageSource(object):
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67 """ A source for pages, e.g. a directory with one file per page.
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68 """
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69 def __init__(self, app, name, config):
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70 self.app = app
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71 self.name = name
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72 self.config = config or {}
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73 self.config.setdefault('realm', REALM_USER)
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74 self._factories = None
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75 self._provider_type = None
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76
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77 def __getattr__(self, name):
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78 try:
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79 return self.config[name]
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80 except KeyError:
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81 raise AttributeError()
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82
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83 @property
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84 def is_theme_source(self):
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85 return self.realm == REALM_THEME
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86
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87 @property
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88 def root_dir(self):
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89 if self.is_theme_source:
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90 return self.app.theme_dir
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91 return self.app.root_dir
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92
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93 def getPages(self):
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94 return build_pages(self.app, self.getPageFactories())
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95
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ac9b94c8fb37 internal: Add utility function to get a page from a source.
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96 def getPage(self, metadata):
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97 rel_path, metadata = self.findPagePath(metadata, MODE_PARSING)
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98 if rel_path is None:
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99 return None
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100 return Page(self, metadata, rel_path)
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101
3
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102 def getPageFactories(self):
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103 if self._factories is None:
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104 self._factories = list(self.buildPageFactories())
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105 return self._factories
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106
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107 def buildPageFactories(self):
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108 raise NotImplementedError()
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109
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110 def resolveRef(self, ref_path):
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111 raise NotImplementedError()
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112
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113 def findPagePath(self, metadata, mode):
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114 raise NotImplementedError()
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115
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116 def buildDataProvider(self, page, user_data):
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117 if self._provider_type is None:
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118 cls = next((pt for pt in self.app.plugin_loader.getDataProviders()
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119 if pt.PROVIDER_NAME == self.data_type),
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120 None)
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121 if cls is None:
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122 raise ConfigurationError(
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123 "Unknown data provider type: %s" % self.data_type)
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124 self._provider_type = cls
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125
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126 return self._provider_type(self, page, user_data)
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127
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128 def getTaxonomyPageRef(self, tax_name):
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129 tax_pages = self.config.get('taxonomy_pages')
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130 if tax_pages is None:
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131 return None
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132 return tax_pages.get(tax_name)
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133