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# Copyright (c) 2010 Nicira Networks
#
# 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.
import re
from ovs.db import error
class Parser(object):
def __init__(self, json, name):
self.name = name
self.json = json
if type(json) != dict:
self.__raise_error("Object expected.")
self.used = set()
def __get(self, name, types, optional, default=None):
if name in self.json:
self.used.add(name)
member = float_to_int(self.json[name])
if is_identifier(member) and "id" in types:
return member
if len(types) and type(member) not in types:
self.__raise_error("Type mismatch for member '%s'." % name)
return member
else:
if not optional:
self.__raise_error("Required '%s' member is missing." % name)
return default
def get(self, name, types):
return self.__get(name, types, False)
def get_optional(self, name, types, default=None):
return self.__get(name, types, True, default)
def __raise_error(self, message):
raise error.Error("Parsing %s failed: %s" % (self.name, message),
self.json)
def finish(self):
missing = set(self.json) - set(self.used)
if missing:
name = missing.pop()
if len(missing) > 1:
self.__raise_error("Member '%s' and %d other members "
"are present but not allowed here"
% (name, len(missing)))
elif missing:
self.__raise_error("Member '%s' and 1 other member "
"are present but not allowed here" % name)
else:
self.__raise_error("Member '%s' is present but not "
"allowed here" % name)
def float_to_int(x):
# XXX still needed?
if type(x) == float:
integer = int(x)
if integer == x and integer >= -2**53 and integer < 2**53:
return integer
return x
id_re = re.compile("[_a-zA-Z][_a-zA-Z0-9]*$")
def is_identifier(s):
return type(s) in [str, unicode] and id_re.match(s)
def json_type_to_string(type):
if type == None:
return "null"
elif type == bool:
return "boolean"
elif type == dict:
return "object"
elif type == list:
return "array"
elif type in [int, long, float]:
return "number"
elif type in [str, unicode]:
return "string"
else:
return "<invalid>"
def unwrap_json(json, name, need_type):
if (type(json) != list or len(json) != 2 or json[0] != name or
type(json[1]) != need_type):
raise error.Error("expected [\"%s\", <%s>]"
% (name, json_type_to_string(need_type)), json)
return json[1]
def parse_json_pair(json):
if type(json) != list or len(json) != 2:
raise error.Error("expected 2-element array", json)
return json
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