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"""Convertible classes for builtin immutable types.""" |
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import logging |
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from .. import exceptions |
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from ..bases import Converter |
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log = logging.getLogger(__name__) |
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10
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class Object(Converter): |
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"""Base class for immutable types.""" |
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TYPE = None # type for inferred types (set in subclasses) |
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DEFAULT = None # default value for conversion (set in subclasses) |
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@classmethod |
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def create_default(cls): |
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return cls.DEFAULT |
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@classmethod |
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def to_value(cls, obj): |
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return obj |
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@classmethod |
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def to_data(cls, obj): |
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return cls.to_value(obj) |
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class String(Object): |
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"""Convertible for the `str` type.""" |
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TYPE = str |
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DEFAULT = "" |
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@classmethod |
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def to_value(cls, obj): |
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if isinstance(obj, cls.TYPE): |
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return obj |
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elif obj is True: |
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return "true" |
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elif obj is False: |
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return "false" |
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elif obj: |
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try: |
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return ', '.join(str(item) for item in obj) |
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except TypeError: |
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return str(obj) |
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else: |
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return cls.DEFAULT |
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@classmethod |
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def to_data(cls, obj): |
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value = cls.to_value(obj) |
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return cls._optimize_for_quoting(value) |
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@staticmethod |
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def _optimize_for_quoting(value): |
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if value == "true": |
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return True |
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if value == "false": |
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return False |
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for number_type in (int, float): |
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try: |
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return number_type(value) |
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except (TypeError, ValueError): |
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continue |
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return value |
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70
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class Integer(Object): |
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"""Convertible for the `int` type.""" |
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TYPE = int |
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DEFAULT = 0 |
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@classmethod |
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def to_value(cls, obj): |
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if all((isinstance(obj, cls.TYPE), |
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obj is not True, |
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obj is not False)): |
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return obj |
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elif obj: |
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try: |
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return int(obj) |
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except ValueError: |
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return int(float(obj)) |
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else: |
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return cls.DEFAULT |
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class Float(Object): |
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"""Convertible for the `float` type.""" |
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TYPE = float |
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DEFAULT = 0.0 |
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@classmethod |
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def to_value(cls, obj): |
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if isinstance(obj, cls.TYPE): |
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return obj |
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elif obj: |
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return float(obj) |
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else: |
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return cls.DEFAULT |
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107
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class Boolean(Object): |
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"""Convertible for the `bool` type.""" |
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TYPE = bool |
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DEFAULT = False |
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FALSY = ('false', 'f', 'no', 'n', 'disabled', 'off', '0') |
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@classmethod |
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def to_value(cls, obj): |
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if isinstance(obj, str) and obj.lower().strip() in cls.FALSY: |
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return False |
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elif obj is not None: |
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return bool(obj) |
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else: |
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return cls.DEFAULT |
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125
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126
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def match(name, data, nested=False): |
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"""Determine the appropriate converter for new data.""" |
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nested = " nested" if nested else "" |
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msg = "Determining converter for new%s: '%s' = %r" |
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log.debug(msg, nested, name, repr(data)) |
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types = Object.__subclasses__() # pylint: disable=no-member |
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log.trace("Converter options: {}".format(types)) |
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134
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135
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for converter in types: |
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if converter.TYPE and type(data) == converter.TYPE: # pylint: disable=unidiomatic-typecheck |
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log.debug("Matched converter: %s", converter) |
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log.info("New%s attribute: %s", nested, name) |
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return converter |
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141
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if data is None or isinstance(data, (dict, list)): |
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log.info("Default converter: %s", Object) |
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log.warning("New%s attribute with unknown type: %s", nested, name) |
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return Object |
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145
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146
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msg = "No converter available for: {}".format(data) |
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147
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raise exceptions.FileContentError(msg) |
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jacebrowning /
yorm
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