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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('\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] + '...'