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import re

# FIXME: use with caution, can leak memory

uids = {}

uids_document = None

def describe_node(node):

global uids

if node is None:

return ""

if not hasattr(node, "tag"):

return "[%s]" % type(node)

name = node.tag

if node.get("id", ""):

name += "#" + node.get("id")

if node.get("class", "").strip():

name += "." + ".".join(node.get("class").split())

if name[:4] in ["div#", "div."]:

name = name[3:]

if name in ["tr", "td", "div", "p"]:

uid = uids.get(node)

if uid is None:

uid = uids[node] = len(uids) + 1

name += "{%02d}" % uid

return name

def describe(node, depth=1):

global uids, uids_document

doc = node.getroottree().getroot()

if doc != uids_document:

uids = {}

uids_document = doc

# return repr(NodeRepr(node))

parent = ""

if depth and node.getparent() is not None:

parent = describe(node.getparent(), depth=depth - 1) + ">"

return parent + describe_node(node)

RE_COLLAPSE_WHITESPACES = re.compile(r"\s+", re.U)

def text_content(elem, length=40):

content = RE_COLLAPSE_WHITESPACES.sub(" ", elem.text_content().replace("\r", ""))

if len(content) < length:

return content

return content[:length] + "..."