tests/test-json.py

   1 # Copyright (c) 2009, 2010 Nicira Networks.
   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 import codecs
  16 import getopt
  17 import sys
  18
  19 import ovs.json
  20
  21 def print_json(json):
  22     if type(json) in [str, unicode]:
  23         print "error: %s" % json
  24         return False
  25     else:
  26         ovs.json.to_stream(json, sys.stdout)
  27         sys.stdout.write("\n")
  28         return True
  29
  30 def parse_multiple(stream):
  31     buf = stream.read(4096)
  32     ok = True
  33     parser = None
  34     while len(buf):
  35         if parser is None and buf[0] in " \t\r\n":
  36             buf = buf[1:]
  37         else:
  38             if parser is None:
  39                 parser = ovs.json.Parser()
  40             n = parser.feed(buf)
  41             buf = buf[n:]
  42             if len(buf):
  43                 if not print_json(parser.finish()):
  44                     ok = False
  45                 parser = None
  46         if len(buf) == 0:
  47             buf = stream.read(4096)
  48     if parser and not print_json(parser.finish()):
  49         ok = False
  50     return ok
  51
  52 def main(argv):
  53     argv0 = argv[0]
  54
  55     # Make stdout and stderr UTF-8, even if they are redirected to a file.
  56     sys.stdout = codecs.getwriter("utf-8")(sys.stdout)
  57     sys.stderr = codecs.getwriter("utf-8")(sys.stderr)
  58
  59     try:
  60         options, args = getopt.gnu_getopt(argv[1:], '', ['multiple'])
  61     except getopt.GetoptError, geo:
  62         sys.stderr.write("%s: %s\n" % (argv0, geo.msg))
  63         sys.exit(1)
  64
  65     multiple = False
  66     for key, value in options:
  67         if key == '--multiple':
  68             multiple = True
  69         else:
  70             sys.stderr.write("%s: unhandled option %s\n" % (argv0, key))
  71             sys.exit(1)
  72
  73     if len(args) != 1:
  74         sys.stderr.write("usage: %s [--multiple] INPUT.json\n" % argv0)
  75         sys.exit(1)
  76
  77     input_file = args[0]
  78     if input_file == "-":
  79         stream = sys.stdin
  80     else:
  81         stream = open(input_file, "r")
  82
  83     if multiple:
  84         ok = parse_multiple(stream)
  85     else:
  86         ok = print_json(ovs.json.from_stream(stream))
  87
  88     if not ok:
  89         sys.exit(1)
  90
  91 if __name__ == '__main__':
  92     main(sys.argv)