def _validate_xml(spec, data, xmltext):
"""Validate the decoded xml.
We don't just use the internal xml and compare it against the external xm;
there may be differences in whitespace, and some fields can be represented
in multiple ways (eg: 5.0 vs 5.00000 vs 5).
"""
xml_entries = xml.etree.ElementTree.iterparse(StringIO.StringIO(xmltext), ['start', 'end'])
child_tail=None
for (is_starting, name, entry, data, expected), (a_event, a_elem) in itertools.izip(_decode_visible(spec, data), xml_entries):
if is_starting and a_event != 'start':
raise Exception ("Expected '%s' to be starting, but got '%s' ending" %
(name, a_elem.tag))
if not is_starting and a_event != 'end':
raise Exception ("Expected '%s' to be ending, but got '%s' starting" %
(name, a_elem.tag))
if xmlout.escape_name(name) != a_elem.tag:
raise Exception("expected '%s', got '%s'" %
(xmlout.escape_name(name), a_elem.tag))
if not is_starting:
text = a_elem.text
if not text or not text.strip() and child_tail is not None:
# We don't have a text node for this child; try using its
# child's trailing text.
text = child_tail
if not text or not text.strip():
# This node doesn't have data; it's possible that it has an
# expected value, so wasn't printed. Get the expected value
# from the constraint.
try:
text = _get_expected(entry)
except _NoExpectedError:
# We don't have an expected value; stick with the existing
# text.
pass
except _ComplexExpectedError:
# We have an expected value that is difficult to evaluate.
# Just use the existing expected... this effectively short
# circuits the test.
text = expected
if text is None:
text = ''
if expected is not None:
if isinstance(entry, fld.Field):
actual = convert_value(entry, text, len(data))
else:
actual = int(text)
if expected != actual:
# If the value is different, it may be that the data cannot
# be represented in xml (eg: a string with a binary
# character). Encode and decode the expected value to see if
# matches now (being escaped itself...)
expected_text = xmlout.xml_strip(unicode(expected))
escaped_expected = convert_value(entry, expected_text, len(data))
constraint = Equals(escaped_expected)
constraint.check(entry, actual, {})
elif a_elem.text is not None and a_elem.text.strip():
raise Exception("Expected empty text in entry '%s', got '%s'!" %
(a_elem.tag, a_elem.text))
child_tail=a_elem.tail
else:
child_tail=None
