Mercurial > libervia-backend

annotate src/tools/common.py @ 1862:6d9c87bdc452

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jp (base): added a CommandBase.start method which is called by run or connected, so subclasses can implement it (this is for simplicity sake, as it's not always clear if run or connected must be used)
author Goffi <goffi@goffi.org>
date Mon, 29 Feb 2016 16:52:51 +0100
parents d17772b0fe22
children
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rev   line source
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1 #!/usr/bin/python
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2 # -*- coding: utf-8 -*-
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3
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4 # SAT: a jabber client
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5 # Copyright (C) 2009-2016 Jérôme Poisson (goffi@goffi.org)
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6
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7 # This program is free software: you can redistribute it and/or modify
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8 # it under the terms of the GNU Affero General Public License as published by
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9 # the Free Software Foundation, either version 3 of the License, or
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10 # (at your option) any later version.
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12 # This program is distributed in the hope that it will be useful,
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13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 # GNU Affero General Public License for more details.
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17 # You should have received a copy of the GNU Affero General Public License
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18 # along with this program. If not, see <http://www.gnu.org/licenses/>.
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20 """ tools common to backend and frontends """
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22 from sat.core import exceptions
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24
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25 def dict2iter(name, dict_, pop=False):
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26 """iterate into a list serialised in a dict
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27
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28 name is the name of the key.
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29 Serialisation is done with [name] [name#1] [name#2] and so on
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30 e.g.: if name is 'group', keys are group, group#1, group#2, ...
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31 iteration stop at first missing increment
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32 Empty values are possible
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33 @param name(unicode): name of the key
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34 @param mb_data (dict): dictionary with the serialised list
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35 @param pop(bool): if True, remove the value from dict
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36 @return iter: iterate through the deserialised list
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37 """
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38 if pop:
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39 get=lambda d,k: d.pop(k)
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40 else:
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41 get=lambda d,k: d[k]
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42
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43 try:
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44 yield get(dict_,name)
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45 except KeyError:
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46 return
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47 else:
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48 idx = 1
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49 while True:
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50 try:
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51 yield get(dict_,u'{}#{}'.format(name, idx))
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52 except KeyError:
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53 return
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54 else:
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55 idx += 1
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56
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57 def iter2dict(name, iter_, dict_=None, check_conflict=True):
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58 """Fill a dict with values from an iterable
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59
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60 name is used to serialise iter_, in the same way as in [dict2iter]
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61 Build from the tags a dict using the microblog data format.
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62
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63 @param name(unicode): key to use for serialisation
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64 e.g. "group" to have keys "group", "group#1", "group#2", ...
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65 @param iter_(iterable): values to store
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66 @param dict_(None, dict): dictionary to fill, or None to create one
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67 @param check_conflict(bool): if True, raise an exception in case of existing key
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68 @return (dict): filled dict, or newly created one
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69 @raise exceptions.ConflictError: a needed key already exists
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70 """
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71 if dict_ is None:
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72 dict_ = {}
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73 for idx, value in enumerate(iter_):
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74 if idx == 0:
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75 key = name
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76 else:
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77 key = u'{}#{}'.format(name, idx)
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78 if check_conflict and key in dict_:
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79 raise exceptions.ConflictError
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80 dict_[key] = value
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81 return dict