tests/test-json.py

   1 # Copyright (c) 2009, 2010 Nicira, Inc.
   2 #
   3 # Licensed under the Apache License, Version 2.0 (the "License");
   4 # you may not use this file except in compliance with the License.
   5 # You may obtain a copy of the License at:
   6 #
   7 #     http://www.apache.org/licenses/LICENSE-2.0
   8 #
   9 # Unless required by applicable law or agreed to in writing, software
  10 # distributed under the License is distributed on an "AS IS" BASIS,
  11 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12 # See the License for the specific language governing permissions and
  13 # limitations under the License.
  14
  15 from __future__ import print_function
  16
  17 import codecs
  18 import getopt
  19 import sys
  20
  21 import ovs.json
  22 import six
  23
  24
  25 def print_json(json):
  26     if isinstance(json, six.string_types):
  27         print("error: %s" % json)
  28         return False
  29     else:
  30         ovs.json.to_stream(json, sys.stdout)
  31         sys.stdout.write("\n")
  32         return True
  33
  34
  35 def parse_multiple(stream):
  36     buf = stream.read(4096)
  37     ok = True
  38     parser = None
  39     while len(buf):
  40         if parser is None and buf[0] in " \t\r\n":
  41             buf = buf[1:]
  42         else:
  43             if parser is None:
  44                 parser = ovs.json.Parser()
  45             n = parser.feed(buf)
  46             buf = buf[n:]
  47             if len(buf):
  48                 if not print_json(parser.finish()):
  49                     ok = False
  50                 parser = None
  51         if len(buf) == 0:
  52             buf = stream.read(4096)
  53     if parser and not print_json(parser.finish()):
  54         ok = False
  55     return ok
  56
  57
  58 def main(argv):
  59     argv0 = argv[0]
  60
  61     # When this is used with Python 3, the program produces no output.
  62     if six.PY2:
  63         # Make stdout and stderr UTF-8, even if they are redirected to a file.
  64         sys.stdout = codecs.getwriter("utf-8")(sys.stdout)
  65         sys.stderr = codecs.getwriter("utf-8")(sys.stderr)
  66
  67     try:
  68         options, args = getopt.gnu_getopt(argv[1:], '', ['multiple'])
  69     except getopt.GetoptError as geo:
  70         sys.stderr.write("%s: %s\n" % (argv0, geo.msg))
  71         sys.exit(1)
  72
  73     multiple = False
  74     for key, value in options:
  75         if key == '--multiple':
  76             multiple = True
  77         else:
  78             sys.stderr.write("%s: unhandled option %s\n" % (argv0, key))
  79             sys.exit(1)
  80
  81     if len(args) != 1:
  82         sys.stderr.write("usage: %s [--multiple] INPUT.json\n" % argv0)
  83         sys.exit(1)
  84
  85     input_file = args[0]
  86     if input_file == "-":
  87         stream = sys.stdin
  88     else:
  89         stream = open(input_file, "r")
  90
  91     if multiple:
  92         ok = parse_multiple(stream)
  93     else:
  94         ok = print_json(ovs.json.from_stream(stream))
  95
  96     if not ok:
  97         sys.exit(1)
  98
  99
 100 if __name__ == '__main__':
 101     main(sys.argv)