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annotate piecrust/sources/base.py @ 3:f485ba500df3

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Gigantic change to basically make PieCrust 2 vaguely functional. - Serving works, with debug window. - Baking works, multi-threading, with dependency handling. - Various things not implemented yet.
author Ludovic Chabant <ludovic@chabant.com>
date Sun, 10 Aug 2014 23:43:16 -0700
parents
children 474c9882decf
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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.page import Page
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9
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10
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11 REALM_USER = 0
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12 REALM_THEME = 1
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13 REALM_NAMES = {
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14 REALM_USER: 'User',
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15 REALM_THEME: 'Theme'}
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16
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17
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18 MODE_PARSING = 0
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19 MODE_CREATING = 1
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20
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21
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22 logger = logging.getLogger(__name__)
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23
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24
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25 page_ref_pattern = re.compile(r'(?P<src>[\w]+)\:(?P<path>.*?)(;|$)')
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26
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27
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28 class PageNotFoundError(Exception):
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29 pass
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30
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31
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32 class InvalidFileSystemEndpointError(Exception):
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33 def __init__(self, source_name, fs_endpoint):
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34 super(InvalidFileSystemEndpointError, self).__init__(
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35 "Invalid file-system endpoint for source '%s': %s" %
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36 (source_name, fs_endpoint))
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37
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38
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39 class PageFactory(object):
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40 """ A class responsible for creating a page.
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41 """
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42 def __init__(self, source, rel_path, metadata):
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43 self.source = source
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44 self.rel_path = rel_path
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45 self.metadata = metadata
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46
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47 @property
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48 def ref_spec(self):
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49 return '%s:%s' % (self.source.name, self.rel_path)
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50
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51 @cached_property
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52 def path(self):
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53 return self.source.resolveRef(self.rel_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, self.metadata, self.rel_path)
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65 # Load it right away, especially when using the page repository,
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66 # because we'll be inside a critical scope.
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67 page._load()
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68 return page
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69
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70
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71 class CachedPageFactory(object):
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72 """ A `PageFactory` (in appearance) that already has a page built.
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73 """
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74 def __init__(self, page):
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75 self._page = page
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76
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77 @property
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78 def rel_path(self):
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79 return self._page.rel_path
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80
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81 @property
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82 def metadata(self):
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83 return self._page.source_metadata
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84
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85 @property
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86 def ref_spec(self):
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87 return self._page.ref_spec
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88
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89 @property
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90 def path(self):
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91 return self._page.path
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92
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93 def buildPage(self):
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94 return self._page
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95
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96
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97 class PageRef(object):
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98 """ A reference to a page, with support for looking a page in different
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99 realms.
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100 """
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101 def __init__(self, app, page_ref):
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102 self.app = app
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103 self._page_ref = page_ref
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104 self._paths = None
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105 self._first_valid_path_index = -2
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106 self._exts = app.config.get('site/auto_formats').keys()
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107
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108 @property
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109 def exists(self):
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110 try:
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111 self._checkPaths()
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112 return True
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113 except PageNotFoundError:
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114 return False
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115
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116 @property
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117 def source_name(self):
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118 self._checkPaths()
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119 return self._paths[self._first_valid_path_index][0]
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120
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121 @property
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122 def source(self):
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123 return self.app.getSource(self.source_name)
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124
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125 @property
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126 def rel_path(self):
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127 self._checkPaths()
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128 return self._paths[self._first_valid_path_index][1]
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129
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130 @property
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131 def path(self):
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132 self._checkPaths()
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133 return self._paths[self._first_valid_path_index][2]
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134
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135 @property
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136 def possible_rel_paths(self):
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137 self._load()
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138 return [p[1] for p in self._paths]
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139
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140 @property
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141 def possible_paths(self):
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142 self._load()
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143 return [p[2] for p in self._paths]
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144
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145 def _load(self):
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146 if self._paths is not None:
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147 return
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148
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149 it = list(page_ref_pattern.finditer(self._page_ref))
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150 if len(it) == 0:
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151 raise Exception("Invalid page ref: %s" % self._page_ref)
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152
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153 self._paths = []
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154 for m in it:
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155 source_name = m.group('src')
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156 source = self.app.getSource(source_name)
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157 if source is None:
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158 raise Exception("No such source: %s" % source_name)
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159 rel_path = m.group('path')
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160 path = source.resolveRef(rel_path)
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161 if '%ext%' in rel_path:
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162 for e in self._exts:
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163 self._paths.append((source_name,
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164 rel_path.replace('%ext%', e),
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165 path.replace('%ext%', e)))
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166 else:
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167 self._paths.append((source_name, rel_path, path))
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168
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169 def _checkPaths(self):
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170 if self._first_valid_path_index >= 0:
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171 return
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172 if self._first_valid_path_index == -1:
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173 raise PageNotFoundError("No valid paths were found for page reference:" %
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174 self._page_ref)
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175
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176 self._load()
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177 for i, path_info in enumerate(self._paths):
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178 if os.path.isfile(path_info[2]):
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179 self._first_valid_path_index = i
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180 break
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181
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182
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183 class PageSource(object):
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184 """ A source for pages, e.g. a directory with one file per page.
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185 """
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186 def __init__(self, app, name, config):
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187 self.app = app
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188 self.name = name
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189 self.config = config
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190 self._factories = None
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191 self._provider_type = None
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192
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193 def __getattr__(self, name):
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194 try:
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195 return self.config[name]
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196 except KeyError:
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197 raise AttributeError()
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198
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199 @property
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200 def is_theme_source(self):
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201 return self.realm == REALM_THEME
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202
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203 @property
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204 def root_dir(self):
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205 if self.is_theme_source:
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206 return self.app.theme_dir
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207 return self.app.root_dir
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208
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209 def getPageFactories(self):
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210 if self._factories is None:
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211 self._factories = list(self.buildPageFactories())
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212 return self._factories
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213
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214 def buildPageFactories(self):
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215 raise NotImplementedError()
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216
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217 def resolveRef(self, ref_path):
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218 raise NotImplementedError()
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219
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220 def findPagePath(self, metadata, mode):
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221 raise NotImplementedError()
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222
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223 def buildDataProvider(self, page, user_data):
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224 if self._provider_type is None:
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225 cls = next((pt for pt in self.app.plugin_loader.getDataProviders()
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diff changeset
226 if pt.PROVIDER_NAME == self.data_type),
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227 None)
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228 if cls is None:
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229 raise ConfigurationError("Unknown data provider type: %s" %
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diff changeset
230 self.data_type)
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231 self._provider_type = cls
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232
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233 return self._provider_type(self, page, user_data)
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234
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235 def getTaxonomyPageRef(self, tax_name):
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236 tax_pages = self.config.get('taxonomy_pages')
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237 if tax_pages is None:
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238 return None
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239 return tax_pages.get(tax_name)
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240
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241
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242 class IPreparingSource:
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243 def setupPrepareParser(self, parser, app):
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244 raise NotImplementedError()
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245
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246 def buildMetadata(self, args):
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247 raise NotImplementedError()
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248
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249
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250 class ArraySource(PageSource):
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251 def __init__(self, app, inner_source, name='array', config=None):
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252 super(ArraySource, self).__init__(app, name, config or {})
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253 self.inner_source = inner_source
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254
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255 @property
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256 def page_count(self):
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diff changeset
257 return len(self.inner_source)
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258
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259 def getPageFactories(self):
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diff changeset
260 for p in self.inner_source:
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diff changeset
261 yield CachedPageFactory(p)
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262
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263
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264 class SimplePageSource(PageSource):
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265 def __init__(self, app, name, config):
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266 super(SimplePageSource, self).__init__(app, name, config)
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267 self.fs_endpoint = config.get('fs_endpoint', name)
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268 self.fs_endpoint_path = os.path.join(self.root_dir, CONTENT_DIR, self.fs_endpoint)
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269 self.supported_extensions = app.config.get('site/auto_formats').keys()
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diff changeset
270
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271 def buildPageFactories(self):
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diff changeset
272 logger.debug("Scanning for pages in: %s" % self.fs_endpoint_path)
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diff changeset
273 if not os.path.isdir(self.fs_endpoint_path):
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diff changeset
274 raise InvalidFileSystemEndpointError(self.name, self.fs_endpoint_path)
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parents:
diff changeset
275
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276 for dirpath, dirnames, filenames in os.walk(self.fs_endpoint_path):
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277 rel_dirpath = os.path.relpath(dirpath, self.fs_endpoint_path)
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278 dirnames[:] = filter(self._filterPageDirname, dirnames)
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279 for f in filter(self._filterPageFilename, filenames):
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280 slug, ext = os.path.splitext(os.path.join(rel_dirpath, f))
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281 if slug.startswith('./') or slug.startswith('.\\'):
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282 slug = slug[2:]
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283 if slug == '_index':
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284 slug = ''
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285 metadata = {'path': slug}
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286 fac_path = f
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287 if rel_dirpath != '.':
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288 fac_path = os.path.join(rel_dirpath, f)
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289 yield PageFactory(self, fac_path, metadata)
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290
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291 def resolveRef(self, ref_path):
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292 return os.path.join(self.fs_endpoint_path, ref_path)
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293
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294 def findPagePath(self, metadata, mode):
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295 uri_path = metadata['path']
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296 if uri_path == '':
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297 uri_path = '_index'
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298 path = os.path.join(self.fs_endpoint_path, uri_path)
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299 _, ext = os.path.splitext(path)
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300
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301 if mode == MODE_CREATING:
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302 if ext == '':
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303 return '%s.*' % path
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304 return path, metadata
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305
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306 if ext == '':
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307 paths_to_check = ['%s.%s' % (path, e)
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308 for e in self.supported_extensions]
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309 else:
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310 paths_to_check = [path]
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311 for path in paths_to_check:
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312 if os.path.isfile(path):
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313 return path, metadata
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314
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315 return None, None
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316
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317 def _filterPageDirname(self, d):
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318 return not d.endswith('-assets')
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319
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320 def _filterPageFilename(self, f):
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321 name, ext = os.path.splitext(f)
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322 return (f[0] != '.' and
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323 f[-1] != '~' and
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324 ext.lstrip('.') in self.supported_extensions and
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325 f not in ['Thumbs.db'])
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326
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327
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328 class DefaultPageSource(SimplePageSource, IPreparingSource):
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329 SOURCE_NAME = 'default'
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330
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331 def __init__(self, app, name, config):
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332 super(DefaultPageSource, self).__init__(app, name, config)
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333
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334 def setupPrepareParser(self, parser, app):
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335 parser.add_argument('uri', help='The URI for the new page.')
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336
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337 def buildMetadata(self, args):
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338 return {'path': args.uri}
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339