def parse_metadata_use(xml_tree):
"""
Records are wrapped in XML as per GLEP 56
returns a dict with keys constisting of USE flag names and values
containing their respective descriptions
"""
uselist = {}
usetags = xml_tree.findall("use")
if not usetags:
return uselist
# It's possible to have multiple 'use' elements.
for usetag in usetags:
flags = usetag.findall("flag")
if not flags:
raise exception.ParseError("missing 'flag' tag(s)")
for flag in flags:
pkg_flag = flag.get("name")
if pkg_flag is None:
raise exception.ParseError(
"missing 'name' attribute for 'flag' tag")
flag_restrict = flag.get("restrict")
# emulate the Element.itertext() method from python-2.7
inner_text = []
stack = []
stack.append(flag)
while stack:
obj = stack.pop()
if isinstance(obj, basestring):
inner_text.append(obj)
continue
if isinstance(obj.text, basestring):
inner_text.append(obj.text)
if isinstance(obj.tail, basestring):
stack.append(obj.tail)
stack.extend(reversed(obj))
if pkg_flag not in uselist:
uselist[pkg_flag] = {}
# (flag_restrict can be None)
uselist[pkg_flag][flag_restrict] = " ".join(
"".join(inner_text).split())
return uselist
def parse_metadata_use(mylines, uselist=None):
"""
Records are wrapped in XML as per GLEP 56
returns a dict of the form a list of flags"""
if uselist is None:
uselist = []
try:
metadatadom = minidom.parse(mylines)
except ExpatError as e:
raise exception.ParseError("metadata.xml: %s" % (e,))
try:
try:
usetag = metadatadom.getElementsByTagName("use")
if not usetag:
return uselist
except NotFoundErr:
return uselist
try:
flags = usetag[0].getElementsByTagName("flag")
except NotFoundErr:
raise exception.ParseError("metadata.xml: " + \
"Malformed input: missing 'flag' tag(s)")
for flag in flags:
pkg_flag = flag.getAttribute("name")
if not pkg_flag:
raise exception.ParseError("metadata.xml: " + \
"Malformed input: missing 'name' attribute for 'flag' tag")
uselist.append(pkg_flag)
return uselist
finally:
metadatadom.unlink()
