Mercurial > hg > decoupage

annotate decoupage/web.py @ 10:a328cc9d2c74

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* fix formatters * allow /inherit keyword to specify configuration * bump version
author k0s <k0scist@gmail.com>
date Fri, 25 Dec 2009 01:03:06 -0500
parents 6a802c87f070
children 9f91acf9874c
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1 """
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2 decoupage: a view with webob
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3 """
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5 import os
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6
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a328cc9d2c74 * fix formatters
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7 from formatters import formatters
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8
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9 from genshi.builder import Markup
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10 from genshi.template import TemplateLoader
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11 from martini.config import ConfigMunger
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12 from paste.fileapp import FileApp
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13 from pkg_resources import resource_filename
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14 from pkg_resources import iter_entry_points
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15 from webob import Request, Response, exc
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17 class Decoupage(object):
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19 ### class level variables
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20 defaults = { 'auto_reload': 'False',
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21 'configuration': None,
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22 'directory': None, # directory to serve
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23 'cascade': 'True', # whether to cascade configuration
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24 'template': 'index.html', # XXX see below
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25 'template_directories': '' # list of directories to look for templates
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26 }
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28 def __init__(self, **app_conf):
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30 # set defaults from app configuration
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31 kw = self.app_conf('decoupage', app_conf)
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32 for key in self.defaults:
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33 setattr(self, key, kw.get(key, self.defaults[key]))
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34
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35 # configure defaults
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36 self.auto_reload = self.auto_reload.lower() == 'true'
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37 self.cascade = self.cascade.lower() == 'true'
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38 self.directory = self.directory.rstrip(os.path.sep)
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39 assert os.path.isdir(self.directory)
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40 self.template_directories = self.template_directories.split() # no spaces in directory names, for now
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41 assert sum([os.path.isdir(directory) for directory in self.template_directories]) == len(self.template_directories)
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42
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43 # static file server
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44 self.fileserver = FileApp
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45
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46 # pluggable index data formatters
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47 self.formatters = {}
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48 for formatter in iter_entry_points('decoupage.formatters'):
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49 try:
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50 _formatter = formatter.load()
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51 template_dir = resource_filename(formatter.module_name, 'templates')
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52 if template_dir not in self.template_directories and os.path.isdir(template_dir):
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53 self.template_directories.append(template_dir)
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54 except:
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55 continue # XXX should probably raise
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56 self.formatters[formatter.name] = _formatter
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57
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58 # template loader
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59 self.loader = TemplateLoader(self.template_directories,
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60 auto_reload=self.auto_reload)
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61
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62 ### methods dealing with HTTP
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63 def __call__(self, environ, start_response):
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64 request = Request(environ)
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65 filename = request.path_info.strip('/')
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66 path = os.path.join(self.directory, filename)
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67 if os.path.exists(path):
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68 if os.path.isdir(path):
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69
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70 if not request.path_info.endswith('/'):
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71 raise exc.HTTPMovedPermanently(add_slash=True)
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72
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73 res = self.get(request)
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74 return res(environ, start_response)
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75 else:
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76 fileserver = self.fileserver(path)
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77 return fileserver(environ, start_response)
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78 else:
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79 raise exc.HTTPNotFound()
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80
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81 def get_response(self, text, content_type='text/html'):
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82 """construct a response to a GET request"""
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83 res = Response(content_type=content_type, body=text)
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84 return res
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85
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86 def get(self, request):
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87 """
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88 return response to a GET requst
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89 """
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90 # ensure a sane path
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91 path = request.path_info.strip('/')
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92 directory = os.path.join(self.directory, path)
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93 path = '/%s' % path
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94
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95 # get the configuraton
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96 conf = self.conf(path)
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97
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98 # add data for the files
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99 files = []
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100 for i in os.listdir(directory):
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101 files.append({'path' : '%s/%s' % (path.rstrip('/'), i),
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102 'name': i,
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103 'description': conf.get(i.lower(), None)})
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104 # build data dictionary
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105 data = {'path': path, 'files': files, 'request': request}
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106
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107 # apply formatters
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108 # XXX this should be cached if not self.auto_reload
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109 if '/formatters' in conf:
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110 # ordered list of formatters to be applied first
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111 formatters = [ i for i in conf['/formatters'].split()
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112 if i in self.formatters ]
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113 else:
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114 formatters = []
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115 for key in conf:
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116 if key.startswith('/'):
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117 key = key[1:]
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118 if key in self.formatters and key not in formatters:
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119 formatters.append(key)
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120 for name in formatters:
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121 formatter = self.formatters[name](conf.get('/%s' % name, ''))
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122 formatter(request, data)
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123
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124
0
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125 # render the template
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126 template = conf.get('/template')
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127 if template is None:
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128 if 'index.html' in [ f['name'] for f in files ]:
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129 template = os.path.join(directory, 'index.html')
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130 else:
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131 template = self.template
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132 if not os.path.isabs(template):
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133 template = os.path.join(directory, template)
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134 if not os.path.exists(template):
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135 template = self.template
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136 template = self.loader.load(template)
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137 res = template.generate(**data).render('html', doctype='html')
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138 return self.get_response(res)
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139
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140 ### internal methods
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141
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142 def conf(self, path, cascade=None):
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143 """returns configuration dictionary appropriate to a path"""
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144 if cascade is None:
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145 cascase = self.cascade
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146
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147 directory = os.path.join(self.directory, path.strip('/'))
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148 if path.strip('/'):
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149 path_tuple = tuple(path.strip('/').split('/'))
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150 else:
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151 path_tuple = ()
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152
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153 # return cached configuration
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154 if hasattr(self, '_conf') and path_tuple in self._conf:
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155 return self._conf[path_tuple]
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156
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157 conf = {}
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158
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159 # local configuration
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160 ini_path = os.path.join(directory, 'index.ini')
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161 if os.path.exists(ini_path):
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162 _conf = ConfigMunger(ini_path).dict()
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163 if len(_conf) == 1:
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164 conf = _conf[_conf.keys()[0]].copy()
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165
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166 # global configuration
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167 if not conf and self.configuration and os.path.exists(self.configuration):
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168 conf = ConfigMunger(self.configuration).dict().get('/%s' % path.rstrip('/'), {})
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169
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170 # inherit and cascade configuration
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171 inherit_directory = None
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172 if '/inherit' in conf:
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173 inherit_directory = conf['/inherit']
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174 elif self.cascade and path_tuple:
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175 inherit_directory = '/%s' % '/'.join(path_tuple[:-1])
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176 if inherit_directory:
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177 parent_configuration = self.conf(inherit_directory)
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178 for key, value in parent_configuration.items():
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179 if key.startswith('/') and key not in conf:
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180 conf[key] = value
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181
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182 # cache configuration
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183 if not self.auto_reload:
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184 if not hasattr(self, '_conf'):
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185 self._conf = {}
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186 self._conf[path_tuple] = conf
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187
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188 return conf
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189
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190 def fmtrs(self, path):
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191 formatters = []
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192 for key, value in self.conf(path).items():
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193 if key.startswith('/'):
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194 key = key[1:]
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195 if key in self.formatters:
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196 formatter = self.formatters[key](value)
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197
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198
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199 def app_conf(self, keystr, app_conf):
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200 keystr += '.'
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201 return dict([(key.split(keystr, 1)[-1], value)
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202 for key, value in app_conf.items()
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203 if key.startswith(keystr) ])