124 lines
4.0 KiB
Python
124 lines
4.0 KiB
Python
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import json
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from .utils import AttrDict
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# 自定义的解析异常
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class ParseError(BaseException):
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def __init__(self, message):
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self.message = message
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# 需要校验的参数对象
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class Argument(object):
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"""
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:param name: name of option
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:param default: default value if the argument if absent
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:param bool required: is required
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"""
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def __init__(self, name, default=None, required=True, type=str, filter=None, help=None, nullable=False):
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self.name = name
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self.default = default
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self.type = type
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self.required = required
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self.nullable = nullable
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self.filter = filter
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self.help = help
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if not isinstance(self.name, str):
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raise TypeError('Argument name must be string')
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if filter and not callable(self.filter):
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raise TypeError('Argument filter is not callable')
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def parse(self, has_key, value):
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if not has_key:
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if self.required and self.default is None:
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raise ParseError(
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self.help or 'Required Error: %s is required' % self.name)
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else:
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return self.default
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elif value in [u'', '', None]:
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if self.default is not None:
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return self.default
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elif not self.nullable and self.required:
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raise ParseError(
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self.help or 'Value Error: %s must not be null' % self.name)
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else:
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return None
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try:
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if self.type:
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if self.type in (list, dict) and isinstance(value, str):
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value = json.loads(value)
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assert isinstance(value, self.type)
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elif self.type == bool and isinstance(value, str):
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assert value.lower() in ['true', 'false']
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value = value.lower() == 'true'
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elif not isinstance(value, self.type):
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value = self.type(value)
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except (TypeError, ValueError, AssertionError):
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raise ParseError(self.help or 'Type Error: %s type must be %s' % (
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self.name, self.type))
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if self.filter:
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if not self.filter(value):
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raise ParseError(
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self.help or 'Value Error: %s filter check failed' % self.name)
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return value
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# 解析器基类
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class BaseParser(object):
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def __init__(self, *args):
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self.args = []
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for e in args:
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if isinstance(e, str):
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e = Argument(e)
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elif not isinstance(e, Argument):
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raise TypeError('%r is not instance of Argument' % e)
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self.args.append(e)
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def _get(self, key):
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raise NotImplementedError
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def _init(self, data):
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raise NotImplementedError
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def add_argument(self, **kwargs):
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self.args.append(Argument(**kwargs))
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def parse(self, data=None, clear=False):
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rst = AttrDict()
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try:
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self._init(data)
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for e in self.args:
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has_key, value = self._get(e.name)
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if clear and has_key is False and e.required is False:
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continue
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rst[e.name] = e.parse(has_key, value)
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except ParseError as err:
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return None, err.message
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return rst, None
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# Json解析器
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class JsonParser(BaseParser):
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def __init__(self, *args):
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self.__data = None
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super(JsonParser, self).__init__(*args)
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def _get(self, key):
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return key in self.__data, self.__data.get(key)
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def _init(self, data):
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try:
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if isinstance(data, (str, bytes)):
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data = data.decode('utf-8')
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self.__data = json.loads(data) if data else {}
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else:
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assert hasattr(data, '__contains__')
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assert hasattr(data, 'get')
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assert callable(data.get)
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self.__data = data
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except (ValueError, AssertionError):
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raise ParseError('Invalid data type for parse')
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