110 lines
3.3 KiB
Python
110 lines
3.3 KiB
Python
# Copyright (c) 2010, 2011 Nicira, Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at:
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import re
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from ovs.db import error
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class Parser(object):
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def __init__(self, json, name):
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self.name = name
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self.json = json
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if type(json) != dict:
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self.__raise_error("Object expected.")
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self.used = set()
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def __get(self, name, types, optional, default=None):
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if name in self.json:
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self.used.add(name)
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member = float_to_int(self.json[name])
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if is_identifier(member) and "id" in types:
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return member
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if len(types) and type(member) not in types:
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self.__raise_error("Type mismatch for member '%s'." % name)
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return member
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else:
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if not optional:
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self.__raise_error("Required '%s' member is missing." % name)
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return default
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def get(self, name, types):
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return self.__get(name, types, False)
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def get_optional(self, name, types, default=None):
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return self.__get(name, types, True, default)
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def __raise_error(self, message):
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raise error.Error("Parsing %s failed: %s" % (self.name, message),
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self.json)
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def finish(self):
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missing = set(self.json) - set(self.used)
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if missing:
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name = missing.pop()
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if len(missing) > 1:
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present = "and %d other members are" % len(missing)
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elif missing:
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present = "and 1 other member are"
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else:
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present = "is"
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self.__raise_error("Member '%s' %s present but not allowed here" %
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(name, present))
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def float_to_int(x):
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# XXX still needed?
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if type(x) == float:
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integer = int(x)
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if integer == x and -2 ** 53 <= integer < 2 ** 53:
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return integer
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return x
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id_re = re.compile("[_a-zA-Z][_a-zA-Z0-9]*$")
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def is_identifier(s):
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return type(s) in [str, unicode] and id_re.match(s)
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def json_type_to_string(type_):
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if type_ == None:
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return "null"
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elif type_ == bool:
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return "boolean"
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elif type_ == dict:
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return "object"
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elif type_ == list:
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return "array"
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elif type_ in [int, long, float]:
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return "number"
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elif type_ in [str, unicode]:
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return "string"
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else:
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return "<invalid>"
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def unwrap_json(json, name, types, desc):
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if (type(json) not in (list, tuple) or len(json) != 2 or json[0] != name or
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type(json[1]) not in types):
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raise error.Error('expected ["%s", <%s>]' % (name, desc), json)
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return json[1]
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def parse_json_pair(json):
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if type(json) != list or len(json) != 2:
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raise error.Error("expected 2-element array", json)
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return json
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