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annotate piecrust/sources/base.py @ 6:f5ca5c5bed85

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More Python 3 fixes, modularization, and new unit tests.
author Ludovic Chabant <ludovic@chabant.com>
date Sat, 16 Aug 2014 08:15:30 -0700
parents 474c9882decf
children 343d08ef5668
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rev   line source
3
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1 import re
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2 import os
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3 import os.path
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4 import logging
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5 from werkzeug.utils import cached_property
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6 from piecrust import CONTENT_DIR
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7 from piecrust.configuration import ConfigurationError
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8 from piecrust.data.base import IPaginationSource, PaginationData
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9 from piecrust.data.filters import PaginationFilter
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10 from piecrust.page import Page
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11
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12
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13 REALM_USER = 0
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14 REALM_THEME = 1
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15 REALM_NAMES = {
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16 REALM_USER: 'User',
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17 REALM_THEME: 'Theme'}
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18
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19
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20 MODE_PARSING = 0
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21 MODE_CREATING = 1
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22
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23
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24 logger = logging.getLogger(__name__)
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25
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26
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27 page_ref_pattern = re.compile(r'(?P<src>[\w]+)\:(?P<path>.*?)(;|$)')
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28
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29
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30 class PageNotFoundError(Exception):
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31 pass
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32
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33
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34 class InvalidFileSystemEndpointError(Exception):
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35 def __init__(self, source_name, fs_endpoint):
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36 super(InvalidFileSystemEndpointError, self).__init__(
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37 "Invalid file-system endpoint for source '%s': %s" %
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38 (source_name, fs_endpoint))
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39
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40
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41 class PageFactory(object):
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42 """ A class responsible for creating a page.
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43 """
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44 def __init__(self, source, rel_path, metadata):
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45 self.source = source
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46 self.rel_path = rel_path
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47 self.metadata = metadata
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48
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49 @property
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50 def ref_spec(self):
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51 return '%s:%s' % (self.source.name, self.rel_path)
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52
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53 @cached_property
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54 def path(self):
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55 return self.source.resolveRef(self.rel_path)
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56
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57 def buildPage(self):
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58 repo = self.source.app.env.page_repository
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59 if repo is not None:
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60 cache_key = '%s:%s' % (self.source.name, self.rel_path)
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61 return repo.get(cache_key, self._doBuildPage)
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62 return self._doBuildPage()
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63
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64 def _doBuildPage(self):
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65 logger.debug("Building page: %s" % self.path)
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66 page = Page(self.source, self.metadata, self.rel_path)
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67 # Load it right away, especially when using the page repository,
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68 # because we'll be inside a critical scope.
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69 page._load()
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70 return page
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71
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72
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73 class CachedPageFactory(object):
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74 """ A `PageFactory` (in appearance) that already has a page built.
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75 """
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76 def __init__(self, page):
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77 self._page = page
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78
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79 @property
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80 def rel_path(self):
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81 return self._page.rel_path
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82
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83 @property
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84 def metadata(self):
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85 return self._page.source_metadata
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86
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87 @property
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88 def ref_spec(self):
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89 return self._page.ref_spec
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90
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91 @property
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92 def path(self):
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93 return self._page.path
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94
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95 def buildPage(self):
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96 return self._page
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97
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98
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99 class PageRef(object):
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100 """ A reference to a page, with support for looking a page in different
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101 realms.
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102 """
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103 def __init__(self, app, page_ref):
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104 self.app = app
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105 self._page_ref = page_ref
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106 self._paths = None
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107 self._first_valid_path_index = -2
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108 self._exts = list(app.config.get('site/auto_formats').keys())
3
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109
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110 @property
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111 def exists(self):
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112 try:
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113 self._checkPaths()
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114 return True
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115 except PageNotFoundError:
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116 return False
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117
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118 @property
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119 def source_name(self):
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120 self._checkPaths()
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121 return self._paths[self._first_valid_path_index][0]
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122
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123 @property
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124 def source(self):
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125 return self.app.getSource(self.source_name)
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126
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127 @property
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128 def rel_path(self):
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129 self._checkPaths()
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130 return self._paths[self._first_valid_path_index][1]
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131
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132 @property
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133 def path(self):
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134 self._checkPaths()
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135 return self._paths[self._first_valid_path_index][2]
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136
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137 @property
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138 def possible_rel_paths(self):
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139 self._load()
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140 return [p[1] for p in self._paths]
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141
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142 @property
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143 def possible_paths(self):
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144 self._load()
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145 return [p[2] for p in self._paths]
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146
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147 def _load(self):
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148 if self._paths is not None:
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149 return
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150
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151 it = list(page_ref_pattern.finditer(self._page_ref))
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152 if len(it) == 0:
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153 raise Exception("Invalid page ref: %s" % self._page_ref)
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154
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155 self._paths = []
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156 for m in it:
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157 source_name = m.group('src')
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158 source = self.app.getSource(source_name)
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159 if source is None:
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160 raise Exception("No such source: %s" % source_name)
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161 rel_path = m.group('path')
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162 path = source.resolveRef(rel_path)
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163 if '%ext%' in rel_path:
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164 for e in self._exts:
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165 self._paths.append((source_name,
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166 rel_path.replace('%ext%', e),
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167 path.replace('%ext%', e)))
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168 else:
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169 self._paths.append((source_name, rel_path, path))
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170
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171 def _checkPaths(self):
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172 if self._first_valid_path_index >= 0:
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173 return
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174 if self._first_valid_path_index == -1:
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175 raise PageNotFoundError("No valid paths were found for page reference:" %
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176 self._page_ref)
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177
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178 self._load()
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179 for i, path_info in enumerate(self._paths):
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180 if os.path.isfile(path_info[2]):
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181 self._first_valid_path_index = i
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182 break
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183
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184
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185 class PageSource(object):
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186 """ A source for pages, e.g. a directory with one file per page.
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187 """
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188 def __init__(self, app, name, config):
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189 self.app = app
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190 self.name = name
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191 self.config = config
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192 self._factories = None
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193 self._provider_type = None
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194
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195 def __getattr__(self, name):
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196 try:
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197 return self.config[name]
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198 except KeyError:
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199 raise AttributeError()
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200
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201 @property
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202 def is_theme_source(self):
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203 return self.realm == REALM_THEME
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204
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205 @property
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206 def root_dir(self):
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207 if self.is_theme_source:
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208 return self.app.theme_dir
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209 return self.app.root_dir
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210
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211 def getPageFactories(self):
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212 if self._factories is None:
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213 self._factories = list(self.buildPageFactories())
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214 return self._factories
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215
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216 def buildPageFactories(self):
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217 raise NotImplementedError()
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218
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219 def resolveRef(self, ref_path):
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220 raise NotImplementedError()
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221
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222 def findPagePath(self, metadata, mode):
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223 raise NotImplementedError()
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224
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225 def buildDataProvider(self, page, user_data):
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226 if self._provider_type is None:
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227 cls = next((pt for pt in self.app.plugin_loader.getDataProviders()
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228 if pt.PROVIDER_NAME == self.data_type),
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229 None)
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230 if cls is None:
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231 raise ConfigurationError("Unknown data provider type: %s" %
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diff changeset
232 self.data_type)
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233 self._provider_type = cls
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234
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235 return self._provider_type(self, page, user_data)
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236
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237 def getTaxonomyPageRef(self, tax_name):
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238 tax_pages = self.config.get('taxonomy_pages')
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239 if tax_pages is None:
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240 return None
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241 return tax_pages.get(tax_name)
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242
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243
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244 class IPreparingSource:
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245 def setupPrepareParser(self, parser, app):
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246 raise NotImplementedError()
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247
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248 def buildMetadata(self, args):
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249 raise NotImplementedError()
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250
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251
6
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252 class SimplePaginationSourceMixin(IPaginationSource):
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253 def getItemsPerPage(self):
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254 return self.config['items_per_page']
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255
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256 def getSourceIterator(self):
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257 return SourceFactoryIterator(self)
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258
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259 def getSorterIterator(self, it):
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260 return DateSortIterator(it)
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261
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262 def getTailIterator(self, it):
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263 return PaginationDataBuilderIterator(it)
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264
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265 def getPaginationFilter(self, page):
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266 conf = (page.config.get('items_filters') or
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267 page.app.config.get('site/items_filters'))
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diff changeset
268 if conf == 'none' or conf == 'nil' or conf == '':
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269 conf = None
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270 if conf is not None:
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271 f = PaginationFilter()
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272 f.addClausesFromConfig(conf)
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273 return f
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274 return None
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275
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276
3
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277 class ArraySource(PageSource):
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278 def __init__(self, app, inner_source, name='array', config=None):
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279 super(ArraySource, self).__init__(app, name, config or {})
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280 self.inner_source = inner_source
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281
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282 @property
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283 def page_count(self):
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284 return len(self.inner_source)
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285
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286 def getPageFactories(self):
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287 for p in self.inner_source:
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288 yield CachedPageFactory(p)
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289
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290
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291 class SimplePageSource(PageSource):
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292 def __init__(self, app, name, config):
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293 super(SimplePageSource, self).__init__(app, name, config)
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294 self.fs_endpoint = config.get('fs_endpoint', name)
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295 self.fs_endpoint_path = os.path.join(self.root_dir, CONTENT_DIR, self.fs_endpoint)
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296 self.supported_extensions = list(app.config.get('site/auto_formats').keys())
3
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297
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298 def buildPageFactories(self):
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299 logger.debug("Scanning for pages in: %s" % self.fs_endpoint_path)
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300 if not os.path.isdir(self.fs_endpoint_path):
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301 raise InvalidFileSystemEndpointError(self.name, self.fs_endpoint_path)
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302
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303 for dirpath, dirnames, filenames in os.walk(self.fs_endpoint_path):
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304 rel_dirpath = os.path.relpath(dirpath, self.fs_endpoint_path)
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305 dirnames[:] = list(filter(self._filterPageDirname, dirnames))
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306 for f in filter(self._filterPageFilename, filenames):
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307 slug, ext = os.path.splitext(os.path.join(rel_dirpath, f))
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308 if slug.startswith('./') or slug.startswith('.\\'):
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309 slug = slug[2:]
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310 if slug == '_index':
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311 slug = ''
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312 metadata = {'path': slug}
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313 fac_path = f
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314 if rel_dirpath != '.':
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315 fac_path = os.path.join(rel_dirpath, f)
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316 yield PageFactory(self, fac_path, metadata)
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317
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318 def resolveRef(self, ref_path):
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319 return os.path.join(self.fs_endpoint_path, ref_path)
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320
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321 def findPagePath(self, metadata, mode):
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322 uri_path = metadata['path']
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323 if uri_path == '':
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324 uri_path = '_index'
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325 path = os.path.join(self.fs_endpoint_path, uri_path)
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326 _, ext = os.path.splitext(path)
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327
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328 if mode == MODE_CREATING:
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329 if ext == '':
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330 return '%s.*' % path
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331 return path, metadata
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332
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333 if ext == '':
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334 paths_to_check = ['%s.%s' % (path, e)
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335 for e in self.supported_extensions]
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336 else:
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337 paths_to_check = [path]
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338 for path in paths_to_check:
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339 if os.path.isfile(path):
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340 return path, metadata
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341
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342 return None, None
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343
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344 def _filterPageDirname(self, d):
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345 return not d.endswith('-assets')
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346
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347 def _filterPageFilename(self, f):
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348 name, ext = os.path.splitext(f)
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349 return (f[0] != '.' and
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350 f[-1] != '~' and
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351 ext.lstrip('.') in self.supported_extensions and
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352 f not in ['Thumbs.db'])
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353
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354
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355 class DefaultPageSource(SimplePageSource, IPreparingSource,
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356 SimplePaginationSourceMixin):
3
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357 SOURCE_NAME = 'default'
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358
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359 def __init__(self, app, name, config):
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360 super(DefaultPageSource, self).__init__(app, name, config)
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361
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362 def setupPrepareParser(self, parser, app):
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363 parser.add_argument('uri', help='The URI for the new page.')
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364
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365 def buildMetadata(self, args):
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366 return {'path': args.uri}
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367
6
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368
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369 class SourceFactoryIterator(object):
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370 def __init__(self, source):
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371 self.source = source
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372 self.it = None # This is to permit recursive traversal of the
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373 # iterator chain. It acts as the end.
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374
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375 def __iter__(self):
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376 for factory in self.source.getPageFactories():
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377 yield factory.buildPage()
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378
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379
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380 class DateSortIterator(object):
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381 def __init__(self, it, reverse=True):
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382 self.it = it
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383 self.reverse = reverse
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384
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385 def __iter__(self):
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386 return iter(sorted(self.it,
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387 key=lambda x: x.datetime, reverse=self.reverse))
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388
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389
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390 class PaginationDataBuilderIterator(object):
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391 def __init__(self, it):
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392 self.it = it
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393
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394 def __iter__(self):
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395 for page in self.it:
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396 yield PaginationData(page)
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397