annotate elementtree/ElementInclude.py @ 0:5169fce2d144 upstream

Import ElementTree (1.3a3-20070912-preview).
author Bastian Blank <bblank@thinkmo.de>
date Fri, 30 May 2008 18:02:30 +0200
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5169fce2d144 Import ElementTree (1.3a3-20070912-preview).
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1 #
5169fce2d144 Import ElementTree (1.3a3-20070912-preview).
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2 # ElementTree
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3 # $Id: ElementInclude.py 3265 2007-09-06 20:42:00Z fredrik $
5169fce2d144 Import ElementTree (1.3a3-20070912-preview).
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4 #
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5 # limited xinclude support for element trees
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6 #
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7 # history:
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8 # 2003-08-15 fl created
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9 # 2003-11-14 fl fixed default loader
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10 #
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11 # Copyright (c) 2003-2004 by Fredrik Lundh. All rights reserved.
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12 #
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13 # fredrik@pythonware.com
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14 # http://www.pythonware.com
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15 #
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16 # --------------------------------------------------------------------
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17 # The ElementTree toolkit is
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18 #
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19 # Copyright (c) 1999-2007 by Fredrik Lundh
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20 #
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21 # By obtaining, using, and/or copying this software and/or its
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22 # associated documentation, you agree that you have read, understood,
5169fce2d144 Import ElementTree (1.3a3-20070912-preview).
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23 # and will comply with the following terms and conditions:
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24 #
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25 # Permission to use, copy, modify, and distribute this software and
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26 # its associated documentation for any purpose and without fee is
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27 # hereby granted, provided that the above copyright notice appears in
5169fce2d144 Import ElementTree (1.3a3-20070912-preview).
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28 # all copies, and that both that copyright notice and this permission
5169fce2d144 Import ElementTree (1.3a3-20070912-preview).
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29 # notice appear in supporting documentation, and that the name of
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30 # Secret Labs AB or the author not be used in advertising or publicity
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31 # pertaining to distribution of the software without specific, written
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32 # prior permission.
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33 #
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34 # SECRET LABS AB AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD
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35 # TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANT-
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36 # ABILITY AND FITNESS. IN NO EVENT SHALL SECRET LABS AB OR THE AUTHOR
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37 # BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY
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38 # DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
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39 # WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
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40 # ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
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41 # OF THIS SOFTWARE.
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42 # --------------------------------------------------------------------
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43
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44 ##
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45 # Limited XInclude support for the ElementTree package.
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46 ##
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47
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48 import copy
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49 import ElementTree
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50
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51 XINCLUDE = "{http://www.w3.org/2001/XInclude}"
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52
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53 XINCLUDE_INCLUDE = XINCLUDE + "include"
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54 XINCLUDE_FALLBACK = XINCLUDE + "fallback"
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55
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56 ##
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57 # Fatal include error.
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58
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59 class FatalIncludeError(SyntaxError):
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60 pass
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61
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62 ##
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63 # Default loader. This loader reads an included resource from disk.
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64 #
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65 # @param href Resource reference.
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66 # @param parse Parse mode. Either "xml" or "text".
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67 # @param encoding Optional text encoding.
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68 # @return The expanded resource. If the parse mode is "xml", this
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69 # is an ElementTree instance. If the parse mode is "text", this
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70 # is a Unicode string. If the loader fails, it can return None
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71 # or raise an IOError exception.
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72 # @throws IOError If the loader fails to load the resource.
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73
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74 def default_loader(href, parse, encoding=None):
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75 file = open(href)
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76 if parse == "xml":
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77 data = ElementTree.parse(file).getroot()
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78 else:
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79 data = file.read()
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80 if encoding:
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81 data = data.decode(encoding)
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82 file.close()
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83 return data
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84
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85 ##
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86 # Expand XInclude directives.
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87 #
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88 # @param elem Root element.
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89 # @param loader Optional resource loader. If omitted, it defaults
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90 # to {@link default_loader}. If given, it should be a callable
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91 # that implements the same interface as <b>default_loader</b>.
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92 # @throws FatalIncludeError If the function fails to include a given
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93 # resource, or if the tree contains malformed XInclude elements.
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94 # @throws IOError If the function fails to load a given resource.
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95
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96 def include(elem, loader=None):
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97 if loader is None:
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98 loader = default_loader
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99 # look for xinclude elements
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100 i = 0
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101 while i < len(elem):
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102 e = elem[i]
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103 if e.tag == XINCLUDE_INCLUDE:
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104 # process xinclude directive
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105 href = e.get("href")
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106 parse = e.get("parse", "xml")
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107 if parse == "xml":
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108 node = loader(href, parse)
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109 if node is None:
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110 raise FatalIncludeError(
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111 "cannot load %r as %r" % (href, parse)
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112 )
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113 node = copy.copy(node)
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114 if e.tail:
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115 node.tail = (node.tail or "") + e.tail
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116 elem[i] = node
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117 elif parse == "text":
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118 text = loader(href, parse, e.get("encoding"))
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119 if text is None:
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120 raise FatalIncludeError(
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121 "cannot load %r as %r" % (href, parse)
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122 )
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123 if i:
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124 node = elem[i-1]
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125 node.tail = (node.tail or "") + text
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126 else:
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127 elem.text = (elem.text or "") + text + (e.tail or "")
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128 del elem[i]
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129 continue
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130 else:
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131 raise FatalIncludeError(
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132 "unknown parse type in xi:include tag (%r)" % parse
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133 )
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134 elif e.tag == XINCLUDE_FALLBACK:
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135 raise FatalIncludeError(
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136 "xi:fallback tag must be child of xi:include (%r)" % e.tag
5169fce2d144 Import ElementTree (1.3a3-20070912-preview).
Bastian Blank <bblank@thinkmo.de>
parents:
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137 )
5169fce2d144 Import ElementTree (1.3a3-20070912-preview).
Bastian Blank <bblank@thinkmo.de>
parents:
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138 else:
5169fce2d144 Import ElementTree (1.3a3-20070912-preview).
Bastian Blank <bblank@thinkmo.de>
parents:
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139 include(e, loader)
5169fce2d144 Import ElementTree (1.3a3-20070912-preview).
Bastian Blank <bblank@thinkmo.de>
parents:
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140 i = i + 1