Mercurial > piecrust2

annotate piecrust/plugins/base.py @ 1005:2e5c5d33d62c

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Merge changes.
author Ludovic Chabant <ludovic@chabant.com>
date Tue, 21 Nov 2017 22:07:12 -0800
parents e7ca3c577305 46025a1b5434
children 8af2ea1f5c34
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rev   line source
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1 import os.path
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2 import sys
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3 import logging
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4 import importlib
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5
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6
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7 logger = logging.getLogger(__name__)
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8
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9
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10 class PieCrustPlugin(object):
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11 def getFormatters(self):
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12 return []
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13
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14 def getTemplateEngines(self):
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15 return []
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16
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17 def getTemplateEngineExtensions(self, engine_name):
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18 return []
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19
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20 def getDataProviders(self):
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21 return []
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22
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23 def getProcessors(self):
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24 return []
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25
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26 def getImporters(self):
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27 return []
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28
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29 def getCommands(self):
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30 return []
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31
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32 def getCommandExtensions(self):
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33 return []
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34
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35 def getBakerAssistants(self):
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36 return []
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37
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38 def getSources(self):
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39 return []
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40
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41 def getPipelines(self):
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42 return []
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43
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44 def getPublishers(self):
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45 return []
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46
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47 def initialize(self, app):
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48 pass
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49
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50
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51 class PluginLoader(object):
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52 def __init__(self, app):
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53 self.app = app
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54 self._plugins = None
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55 self._componentCache = {}
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56
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57 @property
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58 def plugins(self):
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59 self._ensureLoaded()
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60 return self._plugins
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61
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62 def getFormatters(self):
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63 return self._getPluginComponents(
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64 'getFormatters',
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65 initialize=True, register_timer=True,
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66 order_key=lambda f: f.priority)
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67
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68 def getTemplateEngines(self):
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69 return self._getPluginComponents(
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70 'getTemplateEngines',
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71 initialize=True, register_timer=True,
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72 register_timer_suffixes=['_segment', '_layout'])
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73
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74 def getTemplateEngineExtensions(self, engine_name):
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75 return self._getPluginComponents('getTemplateEngineExtensions',
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76 engine_name)
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77
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78 def getDataProviders(self):
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79 return self._getPluginComponents('getDataProviders')
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80
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81 def getProcessors(self):
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82 return self._getPluginComponents(
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83 'getProcessors',
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84 initialize=True, register_timer=True,
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85 order_key=lambda p: p.priority)
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86
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87 def getImporters(self):
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88 return self._getPluginComponents('getImporters')
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89
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90 def getCommands(self):
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91 return self._getPluginComponents('getCommands')
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92
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93 def getCommandExtensions(self):
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94 return self._getPluginComponents('getCommandExtensions')
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95
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96 def getBakerAssistants(self):
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97 return self._getPluginComponents('getBakerAssistants')
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98
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99 def getSources(self):
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100 return self._getPluginComponents('getSources')
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101
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102 def getPipelines(self):
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103 return self._getPluginComponents('getPipelines')
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104
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105 def getPublishers(self):
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106 return self._getPluginComponents('getPublishers')
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107
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108 def _ensureLoaded(self):
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109 if self._plugins is not None:
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110 return
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111
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112 from piecrust.plugins.builtin import BuiltInPlugin
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113 self._plugins = [BuiltInPlugin()]
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114
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115 to_install = self.app.config.get('site/plugins')
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116 if to_install:
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117 for name in to_install:
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118 plugin = self._loadPlugin(name)
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119 if plugin is not None:
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120 self._plugins.append(plugin)
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121
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122 for plugin in self._plugins:
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123 plugin.initialize(self.app)
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124
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125 def _loadPlugin(self, plugin_name):
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126 mod_name = 'piecrust_%s' % plugin_name
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127 try:
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128 # Import from the current environment.
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129 mod = importlib.import_module(mod_name)
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130 except ImportError as ex:
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131 mod = None
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132
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133 if mod is None:
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134 # Import as a loose Python file from the plugins dir.
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135 for plugins_dir in self.app.plugins_dirs:
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136 pfile = os.path.join(plugins_dir, plugin_name + '.py')
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137 if os.path.isfile(pfile):
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138 if sys.version_info[1] >= 5:
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139 # Python 3.5+
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140 from importlib.util import (spec_from_file_location,
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141 module_from_spec)
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142 spec = spec_from_file_location(plugin_name, pfile)
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143 mod = module_from_spec(spec)
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144 spec.loader.exec_module(mod)
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145 sys.modules[mod_name] = mod
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146 else:
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147 # Python 3.4, 3.3.
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148 from importlib.machinery import SourceFileLoader
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149 mod = SourceFileLoader(
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150 plugin_name, pfile).load_module()
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151 sys.modules[mod_name] = mod
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152
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153 if mod is None:
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154 logger.error("Failed to load plugin '%s'." % plugin_name)
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155 return
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156
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157 plugin_class = getattr(mod, '__piecrust_plugin__', None)
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158 if plugin_class is None:
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159 logger.error("Plugin '%s' doesn't specify any "
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160 "`__piecrust_plugin__` class." % plugin_name)
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161 return
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162
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163 try:
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164 plugin = plugin_class()
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165 except Exception as ex:
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166 logger.error("Failed to create plugin '%s': %s" %
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167 (plugin_name, ex))
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168 return
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169
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170 return plugin
0
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171
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172 def _getPluginComponents(self, name, *args,
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173 initialize=False,
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174 register_timer=False,
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175 register_timer_suffixes=None,
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176 order_key=None):
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177 if name in self._componentCache:
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178 return self._componentCache[name]
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179
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180 all_components = []
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181 for plugin in self.plugins:
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182 plugin_components = getattr(plugin, name)(*args)
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183 # Make sure it's a list in case it was an iterator.
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184 plugin_components = list(plugin_components)
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185 all_components += plugin_components
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186
0
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187 if initialize:
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188 for comp in plugin_components:
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189 comp.initialize(self.app)
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190
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191 if register_timer:
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192 for comp in plugin_components:
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193 if not register_timer_suffixes:
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194 self.app.env.stats.registerTimer(
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195 comp.__class__.__name__)
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196 else:
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197 for s in register_timer_suffixes:
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198 self.app.env.stats.registerTimer(
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199 comp.__class__.__name__ + s)
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200
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201 if order_key is not None:
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202 all_components.sort(key=order_key)
0
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203
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204 self._componentCache[name] = all_components
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205 return all_components
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206