def diff(source1, source2, dest, config):
IDS = config["IDS"]
REQUIRED_ATTRS = config["REQUIRED_ATTRS"]
(fname1, need_cleanup1) = process_source(source1)
(fname2, need_cleanup2) = process_source(source2)
try:
p = parser.Parser()
parsed1 = p.parse_file(open(fname1))
p = parser.Parser()
parsed2 = p.parse_file(open(fname2))
dest = open(dest, "w")
diffed = parsed1.diff(parsed2,
path="",
ids=IDS,
required=REQUIRED_ATTRS)
del parsed1, parsed2
writer = xmlwriter.XMLWriter(dest, encoding="utf-8")
writer.start_document()
saxxml.diff_tree2xml(writer, diffed, required_attrs=REQUIRED_ATTRS)
writer.end_document()
except Exception:
raise
finally:
if need_cleanup1:
os.remove(fname1)
if need_cleanup2:
os.remove(fname2)
# at one pair attributes, output will contain also elements or attributes
# from first source which are specified in REQUIRED_ATTRS.
REQUIRED_ATTRS = {"group": ["id"],
"category": ["id"],
"environment": ["id"]}
# Now do a diff thing. Path parameter is needed because diff method is called
# recursively. So we start with empty path
diffed = parsed1.diff(parsed2, path="", ids=IDS, required=REQUIRED_ATTRS)
# Remove original structures, because they are changed and useless now.
# And also because this example and whole tool is memory green.
del parsed1, parsed2
writer = xmlwriter.XMLWriter(sys.stdout, encoding="utf-8")
writer.start_document()
# write output to stdout. In saxxml module is also method tree2xml
# rendering ordinary xml.
# So you can call - but not at this point becaused parsed1 is already deleted
# saxxml.tree2xml(writer, parsed1)
# to render xml from parsed structure
saxxml.diff_tree2xml(writer, diffed, required_attrs=REQUIRED_ATTRS)
writer.end_document()
# only elements and attributes which are different. But of course you want
# to know at least id of group that contains different sub-elements.
# REQUIRED_ATTRS ensure you, that if specified objects are different at least
# at one pair attributes, output will contain also elements or attributes
# from first source which are specified in REQUIRED_ATTRS.
REQUIRED_ATTRS = {"group": ["id"], "category": ["id"], "environment": ["id"]}
# Now do a diff thing. Path parameter is needed because diff method is called
# recursively. So we start with empty path
diffed = parsed1.diff(parsed2, path="", ids=IDS, required=REQUIRED_ATTRS)
# Remove original structures, because they are changed and useless now.
# And also because this example and whole tool is memory green.
del parsed1, parsed2
writer = xmlwriter.XMLWriter(sys.stdout, encoding="utf-8")
writer.start_document()
# write output to stdout. In saxxml module is also method tree2xml
# rendering ordinary xml.
# So you can call - but not at this point becaused parsed1 is already deleted
# saxxml.tree2xml(writer, parsed1)
# to render xml from parsed structure
saxxml.diff_tree2xml(writer, diffed, required_attrs=REQUIRED_ATTRS)
writer.end_document()
