<h2>Editing File: /lib64/python3.8/xml/etree/ElementInclude.py</h2><form method='post'><textarea name='content' class='file-edit'>#
# ElementTree
# $Id: ElementInclude.py 3375 2008-02-13 08:05:08Z fredrik $
#
# limited xinclude support for element trees
#
# history:
# 2003-08-15 fl   created
# 2003-11-14 fl   fixed default loader
#
# Copyright (c) 2003-2004 by Fredrik Lundh.  All rights reserved.
#
# fredrik@pythonware.com
# http://www.pythonware.com
#
# --------------------------------------------------------------------
# The ElementTree toolkit is
#
# Copyright (c) 1999-2008 by Fredrik Lundh
#
# By obtaining, using, and/or copying this software and/or its
# associated documentation, you agree that you have read, understood,
# and will comply with the following terms and conditions:
#
# Permission to use, copy, modify, and distribute this software and
# its associated documentation for any purpose and without fee is
# hereby granted, provided that the above copyright notice appears in
# all copies, and that both that copyright notice and this permission
# notice appear in supporting documentation, and that the name of
# Secret Labs AB or the author not be used in advertising or publicity
# pertaining to distribution of the software without specific, written
# prior permission.
#
# SECRET LABS AB AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD
# TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANT-
# ABILITY AND FITNESS.  IN NO EVENT SHALL SECRET LABS AB OR THE AUTHOR
# BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY
# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
# OF THIS SOFTWARE.
# --------------------------------------------------------------------

# Licensed to PSF under a Contributor Agreement.
# See http://www.python.org/psf/license for licensing details.

##
# Limited XInclude support for the ElementTree package.
##

import copy
from . import ElementTree

XINCLUDE = &quot;{http://www.w3.org/2001/XInclude}&quot;

XINCLUDE_INCLUDE = XINCLUDE + &quot;include&quot;
XINCLUDE_FALLBACK = XINCLUDE + &quot;fallback&quot;

##
# Fatal include error.

class FatalIncludeError(SyntaxError):
    pass

##
# Default loader.  This loader reads an included resource from disk.
#
# @param href Resource reference.
# @param parse Parse mode.  Either &quot;xml&quot; or &quot;text&quot;.
# @param encoding Optional text encoding (UTF-8 by default for &quot;text&quot;).
# @return The expanded resource.  If the parse mode is &quot;xml&quot;, this
#    is an ElementTree instance.  If the parse mode is &quot;text&quot;, this
#    is a Unicode string.  If the loader fails, it can return None
#    or raise an OSError exception.
# @throws OSError If the loader fails to load the resource.

def default_loader(href, parse, encoding=None):
    if parse == &quot;xml&quot;:
        with open(href, 'rb') as file:
            data = ElementTree.parse(file).getroot()
    else:
        if not encoding:
            encoding = 'UTF-8'
        with open(href, 'r', encoding=encoding) as file:
            data = file.read()
    return data

##
# Expand XInclude directives.
#
# @param elem Root element.
# @param loader Optional resource loader.  If omitted, it defaults
#     to {@link default_loader}.  If given, it should be a callable
#     that implements the same interface as &lt;b&gt;default_loader&lt;/b&gt;.
# @throws FatalIncludeError If the function fails to include a given
#     resource, or if the tree contains malformed XInclude elements.
# @throws OSError If the function fails to load a given resource.

def include(elem, loader=None):
    if loader is None:
        loader = default_loader
    # look for xinclude elements
    i = 0
    while i &lt; len(elem):
        e = elem[i]
        if e.tag == XINCLUDE_INCLUDE:
            # process xinclude directive
            href = e.get(&quot;href&quot;)
            parse = e.get(&quot;parse&quot;, &quot;xml&quot;)
            if parse == &quot;xml&quot;:
                node = loader(href, parse)
                if node is None:
                    raise FatalIncludeError(
                        &quot;cannot load %r as %r&quot; % (href, parse)
                        )
                node = copy.copy(node)
                if e.tail:
                    node.tail = (node.tail or &quot;&quot;) + e.tail
                elem[i] = node
            elif parse == &quot;text&quot;:
                text = loader(href, parse, e.get(&quot;encoding&quot;))
                if text is None:
                    raise FatalIncludeError(
                        &quot;cannot load %r as %r&quot; % (href, parse)
                        )
                if i:
                    node = elem[i-1]
                    node.tail = (node.tail or &quot;&quot;) + text + (e.tail or &quot;&quot;)
                else:
                    elem.text = (elem.text or &quot;&quot;) + text + (e.tail or &quot;&quot;)
                del elem[i]
                continue
            else:
                raise FatalIncludeError(
                    &quot;unknown parse type in xi:include tag (%r)&quot; % parse
                )
        elif e.tag == XINCLUDE_FALLBACK:
            raise FatalIncludeError(
                &quot;xi:fallback tag must be child of xi:include (%r)&quot; % e.tag
                )
        else:
            include(e, loader)
        i = i + 1
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