Mercurial > libervia-backend

annotate src/tools/common/data_format.py @ 2153:f67434fd88d2

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tools (common/data_format): added dict2iterdict to yield dictionary from serialised complex values
author Goffi <goffi@goffi.org>
date Thu, 16 Feb 2017 00:40:50 +0100
parents c8e561a5b2b6
children 8b37a62336c3
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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2daf7b4c6756 use of /usr/bin/env instead of /usr/bin/python in shebang
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1 #!/usr/bin/env python2
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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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d17772b0fe22 copyright update
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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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21 # FIXME: json may be more appropriate than manual serialising like done here
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23 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 dict_(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 dict2iterdict(name, dict_, extra_keys, pop=False):
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58 """like dict2iter but yield dictionaries
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59
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60 params are like in [dict2iter], extra_keys is used for extra dict keys.
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61 e.g. dict2iterdict(comments, mb_data, ('node', 'service')) will yield dicts like:
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62 {u'comments': u'value1', u'node': u'value2', u'service': u'value3'}
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63 """
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64 # FIXME: this format seem overcomplicated, it may be more appropriate to use json here
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65 if pop:
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66 get=lambda d,k: d.pop(k)
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67 else:
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68 get=lambda d,k: d[k]
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69 for idx, main_value in enumerate(dict2iter(name, dict_, pop=pop)):
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70 ret = {name: main_value}
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71 for k in extra_keys:
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72 ret[k] = get(dict_, u'{}{}_{}'.format(name, (u'#' + unicode(idx)) if idx else u'', k))
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73 yield ret
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74
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75 def iter2dict(name, iter_, dict_=None, check_conflict=True):
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76 """Fill a dict with values from an iterable
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77
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78 name is used to serialise iter_, in the same way as in [dict2iter]
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79 Build from the tags a dict using the microblog data format.
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80
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81 @param name(unicode): key to use for serialisation
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82 e.g. "group" to have keys "group", "group#1", "group#2", ...
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83 @param iter_(iterable): values to store
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84 @param dict_(None, dict): dictionary to fill, or None to create one
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85 @param check_conflict(bool): if True, raise an exception in case of existing key
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86 @return (dict): filled dict, or newly created one
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87 @raise exceptions.ConflictError: a needed key already exists
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88 """
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89 if dict_ is None:
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90 dict_ = {}
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91 for idx, value in enumerate(iter_):
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92 if idx == 0:
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93 key = name
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94 else:
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95 key = u'{}#{}'.format(name, idx)
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96 if check_conflict and key in dict_:
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97 raise exceptions.ConflictError
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98 dict_[key] = value
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)
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99 return dict
2079
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parents: 1934
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100
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parents: 1934
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101 def getSubDict(name, dict_, sep=u'_'):
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parents: 1934
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102 """get a sub dictionary from a serialised dictionary
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parents: 1934
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103
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parents: 1934
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104 look for keys starting with name, and create a dict with it
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parents: 1934
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105 eg.: if "key" is looked for, {'html': 1, 'key_toto': 2, 'key_titi': 3} will return:
c8e561a5b2b6 core (tools/common): added getSubDict method in data_format to get sub dictionary from serialised one
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parents: 1934
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106 {None: 1, toto: 2, titi: 3}
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parents: 1934
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107 @param name(unicode): name of the key
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parents: 1934
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108 @param dict_(dict): dictionary with the serialised list
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parents: 1934
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109 @param sep(unicode): separator used between name and subkey
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parents: 1934
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110 @return iter: iterate through the deserialised items
c8e561a5b2b6 core (tools/common): added getSubDict method in data_format to get sub dictionary from serialised one
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parents: 1934
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111 """
c8e561a5b2b6 core (tools/common): added getSubDict method in data_format to get sub dictionary from serialised one
Goffi <goffi@goffi.org>
parents: 1934
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112 for k,v in dict_.iteritems():
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Goffi <goffi@goffi.org>
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113 if k.startswith(name):
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parents: 1934
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114 if k == name:
c8e561a5b2b6 core (tools/common): added getSubDict method in data_format to get sub dictionary from serialised one
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parents: 1934
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115 yield None, v
c8e561a5b2b6 core (tools/common): added getSubDict method in data_format to get sub dictionary from serialised one
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parents: 1934
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116 else:
c8e561a5b2b6 core (tools/common): added getSubDict method in data_format to get sub dictionary from serialised one
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117 if k[len(name)] != sep:
c8e561a5b2b6 core (tools/common): added getSubDict method in data_format to get sub dictionary from serialised one
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parents: 1934
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118 continue
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parents: 1934
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119 else:
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parents: 1934
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120 yield k[len(name)+1:], v