136 lines
4.5 KiB
Python
136 lines
4.5 KiB
Python
from __future__ import absolute_import, division, unicode_literals
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try:
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from collections import OrderedDict
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except ImportError:
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try:
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from ordereddict import OrderedDict
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except ImportError:
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OrderedDict = dict
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import re
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from six import string_types
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from . import _base
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from ..utils import moduleFactoryFactory
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tag_regexp = re.compile("{([^}]*)}(.*)")
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def getETreeBuilder(ElementTreeImplementation):
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ElementTree = ElementTreeImplementation
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ElementTreeCommentType = ElementTree.Comment("asd").tag
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class TreeWalker(_base.NonRecursiveTreeWalker):
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"""Given the particular ElementTree representation, this implementation,
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to avoid using recursion, returns "nodes" as tuples with the following
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content:
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1. The current element
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2. The index of the element relative to its parent
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3. A stack of ancestor elements
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4. A flag "text", "tail" or None to indicate if the current node is a
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text node; either the text or tail of the current element (1)
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"""
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def getNodeDetails(self, node):
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if isinstance(node, tuple): # It might be the root Element
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elt, key, parents, flag = node
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if flag in ("text", "tail"):
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return _base.TEXT, getattr(elt, flag)
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else:
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node = elt
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if not(hasattr(node, "tag")):
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node = node.getroot()
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if node.tag in ("DOCUMENT_ROOT", "DOCUMENT_FRAGMENT"):
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return (_base.DOCUMENT,)
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elif node.tag == "<!DOCTYPE>":
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return (_base.DOCTYPE, node.text,
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node.get("publicId"), node.get("systemId"))
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elif node.tag == ElementTreeCommentType:
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return _base.COMMENT, node.text
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else:
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assert isinstance(node.tag, string_types), type(node.tag)
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# This is assumed to be an ordinary element
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match = tag_regexp.match(node.tag)
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if match:
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namespace, tag = match.groups()
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else:
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namespace = None
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tag = node.tag
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attrs = OrderedDict()
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for name, value in list(node.attrib.items()):
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match = tag_regexp.match(name)
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if match:
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attrs[(match.group(1), match.group(2))] = value
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else:
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attrs[(None, name)] = value
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return (_base.ELEMENT, namespace, tag,
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attrs, len(node) or node.text)
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def getFirstChild(self, node):
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if isinstance(node, tuple):
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element, key, parents, flag = node
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else:
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element, key, parents, flag = node, None, [], None
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if flag in ("text", "tail"):
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return None
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else:
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if element.text:
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return element, key, parents, "text"
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elif len(element):
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parents.append(element)
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return element[0], 0, parents, None
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else:
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return None
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def getNextSibling(self, node):
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if isinstance(node, tuple):
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element, key, parents, flag = node
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else:
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return None
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if flag == "text":
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if len(element):
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parents.append(element)
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return element[0], 0, parents, None
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else:
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return None
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else:
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if element.tail and flag != "tail":
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return element, key, parents, "tail"
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elif key < len(parents[-1]) - 1:
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return parents[-1][key + 1], key + 1, parents, None
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else:
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return None
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def getParentNode(self, node):
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if isinstance(node, tuple):
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element, key, parents, flag = node
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else:
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return None
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if flag == "text":
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if not parents:
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return element
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else:
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return element, key, parents, None
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else:
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parent = parents.pop()
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if not parents:
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return parent
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else:
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return parent, list(parents[-1]).index(parent), parents, None
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return locals()
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getETreeModule = moduleFactoryFactory(getETreeBuilder)
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