Mercurial > fife-parpg

annotate engine/python/fife/extensions/serializers/simplexml.py @ 596:0bbe6e8ad9c8

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- corrected example in docstring - this fixes ticket:480
author chewie@33b003aa-7bff-0310-803a-e67f0ece8222
date Mon, 23 Aug 2010 17:44:45 +0000
parents 466d76db9701
children 867aad1c01cd
rev   line source
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1 # -*- coding: utf-8 -*-
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2
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3 # ####################################################################
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4 # Copyright (C) 2005-2010 by the FIFE team
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5 # http://www.fifengine.net
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6 # This file is part of FIFE.
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7 #
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8 # FIFE is free software; you can redistribute it and/or
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9 # modify it under the terms of the GNU Lesser General Public
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10 # License as published by the Free Software Foundation; either
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11 # version 2.1 of the License, or (at your option) any later version.
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12 #
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13 # This library is distributed in the hope that it will be useful,
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14 # but WITHOUT ANY WARRANTY; without even the implied warranty of
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15 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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16 # Lesser General Public License for more details.
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17 #
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18 # You should have received a copy of the GNU Lesser General Public
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19 # License along with this library; if not, write to the
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20 # Free Software Foundation, Inc.,
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21 # 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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22 # ####################################################################
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23
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24 import os
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25 from StringIO import StringIO
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26
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27 from fife.extensions.serializers import ET, SerializerError, InvalidFormat, NotFound
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28
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29
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30 EMPTY_XML_FILE="""\
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31 <?xml version='1.0' encoding='UTF-8'?>
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32 <Settings>
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33
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34 </Settings>
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35 """
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36
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37 class SimpleXMLSerializer(object):
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38 """
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39 This class is a simple interface to get and store data in XML files.
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40
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41 Usage::
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42 from fife.extensions.serializers.simplexml import SimpleXMLSerializer
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43 serializer = SimpleXMLSerializer(filename="somefile.xml")
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44 serializer.set("module_name", "variable_name", "value")
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45 somevariable = serializer.get("module_name", "variable_name", "default_value")
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46 """
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47 def __init__(self, filename=None):
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48 self._file = filename
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49 self._tree = None
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50 self._root_element = None
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51
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52 if self._file:
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53 self.load(self._file)
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54
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55 def load(self, filename=None):
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56 """
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57 Loads the XML file into memory and validates it.
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58
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59 Raises a SerializerError exception if the file is not specified.
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60
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61 @note: If the file does not exist it will automatically create a blank file for you.
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62 """
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63 if filename:
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64 self._file = filename
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65
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66 if not self._file:
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67 raise SerializerError("Cannot load file or create file. No filename specified!")
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68
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69 if not os.path.exists(self._file):
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70 self._tree = ET.parse(StringIO(EMPTY_XML_FILE))
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71 self._tree.write(self._file, 'UTF-8')
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72 else:
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73 self._tree = ET.parse(self._file)
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74
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75 self._root_element = self._tree.getroot()
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76 self._validateTree()
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77
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78 def save(self, filename=None):
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79 """
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80 Saves the XML file.
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81
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82 @note: This Overwrites the file if it exists.
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83 """
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84 if filename:
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85 savefile = filename
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86 else:
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87 savefile = self._file
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88
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89 if not savefile:
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90 raise SerializerError("Cannot save file. No filename specified!")
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91
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92 """ Writes the settings to file """
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93 self._indent(self._root_element)
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94 self._tree.write(savefile, 'UTF-8')
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95
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96
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97 def get(self, module, name, defaultValue=None):
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98 """ Gets the value of a specified variable
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99
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100 @param module: Name of the module to get the variable from
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101 @param name: Variable name
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102 @param defaultValue: Specifies the default value to return if the variable is not found
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103 @type defaultValue: C{str} or C{unicode} or C{int} or C{float} or C{bool} or C{list} or C{dict}
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104 """
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105 if not isinstance(name, str) and not isinstance(name, unicode):
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106 raise AttributeError("SimpleXMLSerializer.get(): Invalid type for name argument.")
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107
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108 moduleTree = self._getModuleTree(module)
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109 element = None
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110 for e in moduleTree.getchildren():
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111 if e.tag == "Setting" and e.get("name", "") == name:
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112 element = e
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113 break
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114 else:
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
115 return defaultValue
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
116
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
117 e_value = element.text
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
118 e_strip = element.get("strip", "1").strip().lower()
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
119 e_type = str(element.get("type", "str")).strip()
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
120
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
121 if e_value is None:
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
122 return defaultValue
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
123
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
124 # Strip value
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
125 if e_strip == "" or e_strip == "false" or e_strip == "no" or e_strip == "0":
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
126 e_strip = False
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
127 else: e_strip = True
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
128
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
129 if e_type == "str" or e_type == "unicode":
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
130 if e_strip: e_value = e_value.strip()
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
131 else:
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
132 e_value = e_value.strip()
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
133
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
134 # Return value
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
135 if e_type == 'int':
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
136 return int(e_value)
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
137 elif e_type == 'float':
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
138 return float(e_value)
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
139 elif e_type == 'bool':
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
140 e_value = e_value.lower()
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
141 if e_value == "" or e_value == "false" or e_value == "no" or e_value == "0":
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
142 return False
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
143 else:
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
144 return True
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
145 elif e_type == 'str':
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
146 return str(e_value)
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
147 elif e_type == 'unicode':
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
148 return unicode(e_value)
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
149 elif e_type == 'list':
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
150 return self._deserializeList(e_value)
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
151 elif e_type == 'dict':
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
152 return self._deserializeDict(e_value)
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
153
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
154 def set(self, module, name, value, extra_attrs={}):
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
155 """
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
156 Sets a variable to specified value.
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
157
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
158 @param module: Module where the variable should be set
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
159 @param name: Name of the variable
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
160 @param value: Value to assign to the variable
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
161 @type value: C{str} or C{unicode} or C{int} or C{float} or C{bool} or C{list} or C{dict}
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
162 @param extra_attrs: Extra attributes to be stored in the XML-file
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
163 @type extra_attrs: C{dict}
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
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164 """
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
165 if not isinstance(name, str) and not isinstance(name, unicode):
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents: 568
diff changeset
166 raise AttributeError("SimpleXMLSerializer.set(): Invalid type for name argument.")
568
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
167
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
168 moduleTree = self._getModuleTree(module)
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
169 e_type = "str"
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
170
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
171 if isinstance(value, bool): # This must be before int
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
172 e_type = "bool"
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parents:
diff changeset
173 value = str(value)
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
174 elif isinstance(value, int):
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parents:
diff changeset
175 e_type = "int"
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
176 value = str(value)
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
177 elif isinstance(value, float):
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
178 e_type = "float"
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
179 value = str(value)
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
180 elif isinstance(value, unicode):
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
181 e_type = "unicode"
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
182 value = unicode(value)
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
183 elif isinstance(value, list):
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
184 e_type = "list"
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
185 value = self._serializeList(value)
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
186 elif isinstance(value, dict):
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
187 e_type = "dict"
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
188 value = self._serializeDict(value)
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
189 else:
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
190 e_type = "str"
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
191 value = str(value)
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
192
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
193 for e in moduleTree.getchildren():
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
194 if e.tag != "Setting": continue
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
195 if e.get("name", "") == name:
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
196 e.text = value
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
197 break
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
198 else:
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
199 attrs = {"name":name, "type":e_type}
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
200 for k in extra_attrs:
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
201 if k not in attrs:
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
202 attrs[k] = extra_args[k]
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
203 elm = ET.SubElement(moduleTree, "Setting", attrs)
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
204 elm.text = value
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
205
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
206 def _validateTree(self):
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parents: 568
diff changeset
207 """
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parents: 568
diff changeset
208 Iterates the XML tree and prints warning when an invalid tag is found.
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parents: 568
diff changeset
209
466d76db9701 Some small code cleanups in the extensions.
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parents: 568
diff changeset
210 Raises an InvalidFormat exception if there is a format error.
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents: 568
diff changeset
211 """
568
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
212 for c in self._root_element.getchildren():
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
213 if c.tag != "Module":
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents: 568
diff changeset
214 raise InvalidFormat("Invalid tag in " + self._file + ". Expected Module, got: " + c.tag)
568
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
215 elif c.get("name", "") == "":
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents: 568
diff changeset
216 raise InvalidFormat("Invalid tag in " + self._file + ". Module name is empty.")
568
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
217 else:
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
218 for e in c.getchildren():
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
219 if e.tag != "Setting":
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents: 568
diff changeset
220 raise InvalidFormat("Invalid tag in " + self._file + " in module: " + c.tag + ". Expected Setting, got: " + e.tag)
568
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
221 elif c.get("name", "") == "":
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents: 568
diff changeset
222 raise InvalidFormat("Invalid tag in " + self._file + " in module: " + c.tag + ". Setting name is empty" + e.tag)
568
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
223
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
224 def _getModuleTree(self, module):
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
225 """
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
226 Returns a module element from the XML tree. If no module with the specified
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
227 name exists, a new element will be created.
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
228
bfbf329e1da8 Forgot to add the simplexml.py file in my last commit.
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229 @param module: The module to get from the settings tree
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230 @type module: C{string}
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231 """
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232 if not isinstance(module, str) and not isinstance(module, unicode):
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233 raise AttributeError("Settings:_getModuleTree: Invalid type for module argument.")
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234
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235 for c in self._root_element.getchildren():
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236 if c.tag == "Module" and c.get("name", "") == module:
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237 return c
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238
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239 # Create module
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240 return ET.SubElement(self._root_element, "Module", {"name":module})
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241
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242 def _indent(self, elem, level=0):
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243 """
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244 Adds whitespace, so the resulting XML-file is properly indented.
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245 Shamelessly stolen from http://effbot.org/zone/element-lib.htm
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246 """
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247 i = "\n" + level*" "
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248 if len(elem):
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249 if not elem.text or not elem.text.strip():
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250 elem.text = i + " "
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251 if not elem.tail or not elem.tail.strip():
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252 elem.tail = i
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253 for elem in elem:
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254 self._indent(elem, level+1)
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255 if not elem.tail or not elem.tail.strip():
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256 elem.tail = i
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257 else:
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258 if level and (not elem.tail or not elem.tail.strip()):
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259 elem.tail = i
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260
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261 # FIXME:
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262 # These serialization functions are not reliable at all
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263 # This will only serialize the first level of a dict or list
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264 # It will not check the types nor the content for conflicts.
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265 # Perhaps we should add a small serialization library?
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266 def _serializeList(self, list):
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267 """ Serializes a list, so it can be stored in a text file """
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268 return " ; ".join(list)
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269
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270 def _deserializeList(self, string):
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271 """ Deserializes a list back into a list object """
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272 return string.split(" ; ")
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273
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274 def _serializeDict(self, dict):
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275 """ Serializes a list, so it can be stored in a text file """
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276 serial = ""
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277 for key in dict:
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278 value = dict[key]
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279 if serial != "": serial += " ; "
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280 serial += str(key)+" : "+str(value)
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281
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282 return serial
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283
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284 def _deserializeDict(self, serial):
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285 """ Deserializes a list back into a dict object """
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286 dict = {}
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287 items = serial.split(" ; ")
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288 for i in items:
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289 kv_pair = i.split(" : ")
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290 dict[kv_pair[0]] = kv_pair[1]
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291 return dict
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292