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#!/usr/bin/env python3
# Copyright (c) 2020 VMware, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at:
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# Breaks lines read from stdin into groups using blank lines as
# group separators, then sorts lines within the groups for
# reproducibility.
import re
import sys
def lookup_uuid(uuids, match):
return "<%s>" % uuids.setdefault(match.group(0), len(uuids))
int_re = re.compile(r'\d+')
def sort_set(match):
s = match.group(0)
uuids = sorted([int(x) for x in int_re.findall(s)])
return '["set",[' + ','.join('["uuid","<%s>"]' % x for x in uuids) + ']]'
u = '[0-9a-fA-F]'
uuid_re = re.compile(r'%s{8}(?<!ffffffff)-%s{4}-%s{4}-%s{4}-%s{12}'
% ((u,) * 5))
set_re = re.compile(r'(\["set",\[(,?\["uuid","<\d+>"\])+\]\])')
def filter_uuids(src, dst):
uuids = {}
def lf(match):
return lookup_uuid(uuids, match)
while True:
line = src.readline()
if not line:
break
line = uuid_re.sub(lf, line)
# Sort sets like this:
# [["uuid","<1>"],["uuid","<0>"]]
# to look like this:
# [["uuid","<0>"],["uuid","<1>"]]
line = set_re.sub(sort_set, line)
dst.write(line)
if __name__ == '__main__':
if '--help' in sys.argv:
print("""\
uuidfilt, for filtering UUIDs into numbered markers
usage: %s [INPUT..] > OUTPUT
or %s < INPUT > OUTPUT
Reads each INPUT, locates UUIDs in the standard textual form, and
converts them into numbered markers <0>, <1>, ..., <n>, where <0>
stands in for each instance of the first unique UUID found, <1> for
each instance of the second, and so on.
UUIDs that begin with ffffffff are not converted to markers.
""")
elif len(sys.argv) > 1:
for src in sys.argv[1:]:
filter_uuids(open(src), sys.stdout)
else:
filter_uuids(sys.stdin, sys.stdout)
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