author | Tero Marttila <terom@fixme.fi> |
Mon, 09 Feb 2009 23:49:57 +0200 | |
changeset 73 | 5a7188bf2894 |
parent 62 | e7ca94b94a4e |
child 79 | 43ac75054d5c |
permissions | -rw-r--r-- |
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""" |
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Handling user preferences |
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""" |
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import functools |
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import Cookie |
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from qmsk.web import urltree |
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class Preference (urltree.URLType) : |
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""" |
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A specific preference |
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""" |
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# the name to use |
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name = None |
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# the default value |
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default = None |
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def process (self, preferences, value) : |
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""" |
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Post-process this preference value. This can access the values of other preferences or the request via |
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the given RequestPreferences. Note that the other items will not be post-processed here. |
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Defaults to just return value. |
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""" |
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return value |
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class RequestPreferences (object) : |
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""" |
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Represents the specific preferences for some request |
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""" |
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def __init__ (self, preferences, request, value_map=None) : |
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""" |
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Initialize with the given Preferences object, http Request, and list of mapping of raw preference values |
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""" |
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# store |
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self.preferences = preferences |
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self.request = request |
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# initialize |
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self.values = {} |
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self.set_cookies = {} |
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# load preferences |
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for pref in preferences.pref_list : |
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# got a value for it? |
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if value_map and pref.name in value_map : |
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# get value |
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value = value_map[pref.name] |
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# parse it |
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value = pref.parse(value) |
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else : |
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# use default value |
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value = pref.default |
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# add |
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self.values[pref.name] = value |
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# then post-process using the Preferences |
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self.values = dict( |
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(name, self.preferences.pref_map[name].process(self, value)) for name, value in self.values.iteritems() |
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) |
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def get (self, pref) : |
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""" |
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Return the value for the given Preference, or preference name |
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""" |
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# Preference -> name |
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if isinstance(pref, Preference) : |
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pref = pref.name |
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# look up |
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return self.values[pref] |
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# support dict-access |
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__getitem__ = get |
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def set (self, name, value_obj) : |
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""" |
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Set a new value for the given preference |
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""" |
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# sanity-check to make sure we're not setting it twice... |
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assert name not in self.set_cookies |
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# encode using the Preference object |
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value_str = self.preferences.pref_map[name].build(value_obj) |
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# update in our dict |
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self.values[name] = value_obj |
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# add to set_cookies |
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self.set_cookies[name] = value_str |
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class Preferences (object) : |
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""" |
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Handle user preferences using cookies |
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""" |
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def __init__ (self, pref_list) : |
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""" |
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Use the given list of Preference objects |
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""" |
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# store |
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self.pref_list = pref_list |
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# translate to mapping as well |
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self.pref_map = dict((pref.name, pref) for pref in pref_list) |
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def load (self, request, ) : |
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""" |
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Load the set of preferences for the given request, and return as a { name -> value } dict |
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""" |
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# the dict of values |
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values = {} |
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126 |
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# load the cookies |
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cookie_data = request.env.get('HTTP_COOKIE') |
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129 |
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# got any? |
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if cookie_data : |
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# parse into a SimpleCookie |
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cookies = Cookie.SimpleCookie(cookie_data) |
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# update the the values |
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values.update((morsel.key, morsel.value) for morsel in cookies.itervalues()) |
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else : |
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cookies = None |
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140 |
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# apply any query parameters |
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for pref in self.pref_list : |
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# look for a query param |
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value = request.get_arg(pref.name) |
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145 |
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if value : |
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# override |
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values[pref.name] = value |
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149 |
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# build the RequestPreferences object |
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return cookies, RequestPreferences(self, request, values) |
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def handler (self, *pref_list) : |
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""" |
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Intended to be used as a decorator for a request handler, this will load the give Preferences and pass |
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them to the wrapped handler as keyword arguments, in addition to any others given. |
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""" |
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def _decorator (func) : |
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@functools.wraps(func) |
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def _handler (request, **args) : |
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# load preferences |
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cookies, prefs = self.load(request) |
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164 |
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# bind to request.prefs |
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# XXX: better way to do this? :/ |
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request.prefs = prefs |
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# update args with new ones |
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args.update(((pref.name, prefs.get(pref)) for pref in pref_list)) |
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171 |
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# handle to get response |
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response = func(request, **args) |
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174 |
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# set cookies? |
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if prefs.set_cookies : |
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if not cookies : |
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cookies = Cookie.SimpleCookie('') |
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179 |
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# update cookies |
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for key, value in prefs.set_cookies.iteritems() : |
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cookies[key] = value |
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183 |
|
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# add headers |
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185 |
for morsel in cookies.itervalues() : |
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response.add_header('Set-cookie', morsel.OutputString()) |
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187 |
|
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188 |
return response |
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189 |
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# return wrapped handler |
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191 |
return _handler |
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192 |
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# return decorator... |
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194 |
return _decorator |
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195 |
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# now for our defined preferences.... |
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197 |
import pytz |
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import config |
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199 |
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class TimeFormat (urltree.URLStringType, Preference) : |
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""" |
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202 |
Time format |
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203 |
""" |
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# set name |
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name = 'time_format' |
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207 |
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# default value |
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default = config.PREF_TIME_FMT_DEFAULT |
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class DateFormat (urltree.URLStringType, Preference) : |
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""" |
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Date format |
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""" |
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# set name |
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name = 'date_format' |
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# default value |
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default = config.PREF_DATE_FMT_DEFAULT |
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class Timezone (Preference) : |
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""" |
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Timezone |
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""" |
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# set name |
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name = 'timezone' |
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# default value is UTC... |
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default = config.PREF_TIMEZONE_DEFAULT |
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def parse (self, name) : |
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""" |
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tz_name -> pytz.timezone |
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""" |
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return pytz.timezone(name) |
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def build (self, tz) : |
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""" |
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pytz.timezone -> tz_name |
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""" |
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return tz.zone |
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class Formatter (Preference) : |
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""" |
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LogFormatter to use |
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""" |
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# set name |
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name = 'formatter' |
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def __init__ (self, formatters, default) : |
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""" |
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Use the given { name -> class LogFormatter } dict and default (a LogFormatter class) |
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""" |
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self.formatters = formatters |
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self.default = default |
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def parse (self, fmt_name) : |
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""" |
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fmt_name -> class LogFormatter |
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""" |
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return self.formatters[fmt_name] |
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def build (self, fmt_cls) : |
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""" |
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class LogFormatter -> fmt_name |
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""" |
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return fmt_cls.name |
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def process (self, prefs, fmt_cls) : |
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""" |
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class LogFormatter -> LogFormatter(tz, time_fmt) |
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""" |
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return fmt_cls(prefs[timezone], prefs[time_format]) |
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class Count (urltree.URLIntegerType, Preference) : |
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""" |
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Number of lines of log data to display per page |
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""" |
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# set name |
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name = "count" |
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# default |
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default = config.PREF_COUNT_DEFAULT |
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def __init__ (self) : |
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super(Count, self).__init__(allow_negative=False, allow_zero=False, max=config.PREF_COUNT_MAX) |
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# and then build the Preferences object |
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time_format = TimeFormat() |
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date_format = DateFormat() |
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timezone = Timezone() |
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formatter = Formatter(config.LOG_FORMATTERS, config.PREF_FORMATTER_DEFAULT) |
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count = Count() |
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preferences = Preferences([ |
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time_format, |
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date_format, |
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timezone, |
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formatter, |
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count, |
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]) |
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