How to use remove_targets method in localstack

Best Python code snippet using localstack_python

xml_patch.py

Source:xml_patch.py

1#!/usr/bin/env python2# Copyright (c) 2012 The Chromium Authors. All rights reserved.3# Use of this source code is governed by a BSD-style license that can be4# found in the LICENSE file.5""" This module is a utility for applying an xml patch to an xml file.6The format of the patch is described in the documentation for7the patch_xml() function.8"""9import collections10import copy11import third_party.etree.ElementTree as ElementTree12def PatchXML(source_xml_tree, patch_xml_tree):13  """Applies a patch to the source xml and returns a new merged xml tree.14  Given a patch xml tree, it applies the patch to the source xml tree15  and returns the resulting modified xml tree.16  Patching is done by reading the patch_xml_tree for an element and then17  finding the in-order matching element in the source_xml_tree. Both elements18  are entered to look for matching sub-elements recursively.19  Patching occurs when a <PatchRemove> or <PatchAdd> element is encountered20  in the patch xml tree. For a remove operation, the first element in the21  source_xml_tree from the current read position that matches the contents of22  the <PatchRemove> element is removed. The read pointer is updated accordingly.23  For an add operation, the contents of the <PatchAdd> element is added at the24  current reading location.25  If for example, an add operation needs to be done after certain elements,26  the elements can be listed before the <PatchAdd> operation so that they are27  matched first before the add operation.28  Example:29  Source file:30  <a>31    <b></b>32    <c></c>33  </a>34  Patch file:35  <a>36    <b></b>37    <PatchAdd><zzz></zzz></PatchAdd>38  </a>39  Result:40  <a>41    <b></b>42    <zzz></zzz>43    <c></c>44  </a>45  Args:46    source_xml_tree: An ElementTree object with base xml to change.47    patch_xml_tree: An ElementTree object with xml to apply. See above notes48      for the xml structure of a patch.49  Returns:50    A new xml tree based on source with the patch applied.51  Raises:52    General Exception indicating a merge error has occured.53  """54  source = source_xml_tree.getroot()55  patch = patch_xml_tree.getroot()56  if not ElementMatch(source, patch):57    raise Exception('Root nodes do not match, cannot merge')58  return ElementTree.ElementTree(MergeElement(source, patch))59def MergeElement(source_elem, patch_elem):60  """Applies a single patch element to a single source element.61  The merge is applied recursively for sub-elements. See the documentation62  for patch_xml() for a description of how patching is done.63  Args:64    source_elem: An Element object with xml to change.65    patch_elem: An Element object with xml to apply.66  Returns:67    A new xml Element with the patch_elem applied to source_elem.68  Raises:69    General Exception indicating a merge error has occured.70  """71  assert ElementMatch(source_elem, patch_elem), 'Mismatched merge'72  # Create a new element by copying tags from source. Below we will merge73  # the subelements of source with the patch and put them in new_element.74  new_element = ElementTree.Element(source_elem.tag, source_elem.attrib)75  patch_children = list(patch_elem)76  patch_index = 077  remove_targets = collections.deque()78  find_target = None79  for source_child in source_elem:80    # If we have no current patch operation then read the next patch element.81    while (len(remove_targets) == 0 and find_target is None and82        patch_index < len(patch_children)):83      # PatchAdd operation.84      if IsPatchAddTag(patch_children[patch_index].tag):85        for addition in patch_children[patch_index]:86          new_element.append(copy.deepcopy(addition))87      # Start a remove operation by creating a list of elements to skip adding.88      elif IsPatchRemoveTag(patch_children[patch_index].tag):89        remove_targets = collections.deque(90            patch_children[patch_index])91      # Not an Add or Remove, must be a find target (find operation).92      else:93        find_target = patch_children[patch_index]94      patch_index += 195    # A remove operation means skipping adding the element to new_element.96    if (len(remove_targets) > 0 and97        ElementMatch(source_child, remove_targets[0])):98      remove_targets.popleft()99    # A matching find target means we must merge the sub-elements.100    elif find_target is not None and ElementMatch(source_child, find_target):101      merge = MergeElement(source_child, find_target)102      new_element.append(copy.deepcopy(merge))103      find_target = None104    # Otherwise this source element doesn't match any patch operations, add it.105    else:106      new_element.append(copy.deepcopy(source_child))107  # Raise exceptions if find/remove didn't finish before the end of the source.108  if find_target is not None:109    raise Exception('Find operation never matched:' + find_target.tag)110  elif len(remove_targets) != 0:111    raise Exception('Remove operation never matched: ' + remove_targets)112  # We may have more add operations after source has run empty:113  while patch_index < len(patch_children):114    if IsPatchAddTag(patch_children[patch_index].tag):115      for addition in patch_children[patch_index]:116        new_element.append(copy.deepcopy(addition))117      patch_index += 1118    else:119      raise Exception('Non-add operation attempted after source end. ' +120                      'Tag: %s, Children %s' %121                      (patch_children[patch_index].tag,122                       list(patch_children[patch_index])))123  return new_element124def ElementMatch(elem1, elem2):125  return elem1.tag == elem2.tag and elem1.attrib == elem2.attrib126def IsPatchAddTag(tag):127  # We look at the end of the tag because we need to ignore the namespace.128  # Because the tag can be a sub-element of arbitrary elements it could inherit129  # any default namespace.130  return tag.endswith('PatchAdd')131def IsPatchRemoveTag(tag):132  # We look at the end of the tag because we need to ignore the namespace.133  # Because the tag can be a sub-element of arbitrary elements it could inherit134  # any default namespace....

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