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annotate src/tools/common.py @ 1660:204c2a7fe68b

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core (tools): new tools.common module with tools used by backend and frontends. dict2iter and iter2dict method to serialise iterable in a dict (for bridge)
author Goffi <goffi@goffi.org>
date Tue, 24 Nov 2015 16:21:18 +0100
parents
children d17772b0fe22
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1660
204c2a7fe68b core (tools): new tools.common module with tools used by backend and frontends. dict2iter and iter2dict method to serialise iterable in a dict (for bridge)
Goffi <goffi@goffi.org>
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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, 2010, 2011, 2012, 2013, 2014, 2015 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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11
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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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19
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20 """ tools common to backend and frontends """
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21
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22 from sat.core import exceptions
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23
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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