Viewing file:  etree_lxml.py (6.21 KB) -rw-r--r--
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from __future__ import absolute_import, division, unicode_literals
from pip._vendor.six import text_type
from collections import OrderedDict
from lxml import etree
from ..treebuilders.etree import tag_regexp
from . import base
from .. import _ihatexml
def ensure_str(s):
if s is None:
return None
elif isinstance(s, text_type):
return s
else:
return s.decode("ascii", "strict")
class Root(object):
def __init__(self, et):
self.elementtree = et
self.children = []
try:
if et.docinfo.internalDTD:
self.children.append(Doctype(self,
ensure_str(et.docinfo.root_name),
ensure_str(et.docinfo.public_id),
ensure_str(et.docinfo.system_url)))
except AttributeError:
pass
try:
node = et.getroot()
except AttributeError:
node = et
while node.getprevious() is not None:
node = node.getprevious()
while node is not None:
self.children.append(node)
node = node.getnext()
self.text = None
self.tail = None
def __getitem__(self, key):
return self.children[key]
def getnext(self):
return None
def __len__(self):
return 1
class Doctype(object):
def __init__(self, root_node, name, public_id, system_id):
self.root_node = root_node
self.name = name
self.public_id = public_id
self.system_id = system_id
self.text = None
self.tail = None
def getnext(self):
return self.root_node.children[1]
class FragmentRoot(Root):
def __init__(self, children):
self.children = [FragmentWrapper(self, child) for child in children]
self.text = self.tail = None
def getnext(self):
return None
class FragmentWrapper(object):
def __init__(self, fragment_root, obj):
self.root_node = fragment_root
self.obj = obj
if hasattr(self.obj, 'text'):
self.text = ensure_str(self.obj.text)
else:
self.text = None
if hasattr(self.obj, 'tail'):
self.tail = ensure_str(self.obj.tail)
else:
self.tail = None
def __getattr__(self, name):
return getattr(self.obj, name)
def getnext(self):
siblings = self.root_node.children
idx = siblings.index(self)
if idx < len(siblings) - 1:
return siblings[idx + 1]
else:
return None
def __getitem__(self, key):
return self.obj[key]
def __bool__(self):
return bool(self.obj)
def getparent(self):
return None
def __str__(self):
return str(self.obj)
def __unicode__(self):
return str(self.obj)
def __len__(self):
return len(self.obj)
class TreeWalker(base.NonRecursiveTreeWalker):
def __init__(self, tree):
# pylint:disable=redefined-variable-type
if isinstance(tree, list):
self.fragmentChildren = set(tree)
tree = FragmentRoot(tree)
else:
self.fragmentChildren = set()
tree = Root(tree)
base.NonRecursiveTreeWalker.__init__(self, tree)
self.filter = _ihatexml.InfosetFilter()
def getNodeDetails(self, node):
if isinstance(node, tuple): # Text node
node, key = node
assert key in ("text", "tail"), "Text nodes are text or tail, found %s" % key
return base.TEXT, ensure_str(getattr(node, key))
elif isinstance(node, Root):
return (base.DOCUMENT,)
elif isinstance(node, Doctype):
return base.DOCTYPE, node.name, node.public_id, node.system_id
elif isinstance(node, FragmentWrapper) and not hasattr(node, "tag"):
return base.TEXT, ensure_str(node.obj)
elif node.tag == etree.Comment:
return base.COMMENT, ensure_str(node.text)
elif node.tag == etree.Entity:
return base.ENTITY, ensure_str(node.text)[1:-1] # strip &;
else:
# This is assumed to be an ordinary element
match = tag_regexp.match(ensure_str(node.tag))
if match:
namespace, tag = match.groups()
else:
namespace = None
tag = ensure_str(node.tag)
attrs = OrderedDict()
for name, value in list(node.attrib.items()):
name = ensure_str(name)
value = ensure_str(value)
match = tag_regexp.match(name)
if match:
attrs[(match.group(1), match.group(2))] = value
else:
attrs[(None, name)] = value
return (base.ELEMENT, namespace, self.filter.fromXmlName(tag),
attrs, len(node) > 0 or node.text)
def getFirstChild(self, node):
assert not isinstance(node, tuple), "Text nodes have no children"
assert len(node) or node.text, "Node has no children"
if node.text:
return (node, "text")
else:
return node[0]
def getNextSibling(self, node):
if isinstance(node, tuple): # Text node
node, key = node
assert key in ("text", "tail"), "Text nodes are text or tail, found %s" % key
if key == "text":
# XXX: we cannot use a "bool(node) and node[0] or None" construct here
# because node[0] might evaluate to False if it has no child element
if len(node):
return node[0]
else:
return None
else: # tail
return node.getnext()
return (node, "tail") if node.tail else node.getnext()
def getParentNode(self, node):
if isinstance(node, tuple): # Text node
node, key = node
assert key in ("text", "tail"), "Text nodes are text or tail, found %s" % key
if key == "text":
return node
# else: fallback to "normal" processing
elif node in self.fragmentChildren:
return None
return node.getparent()
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