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8baff1c7c0
* Add custom __dir__ to Underscore (see #3707) * Make sure custom extension methods keep their docstrings (see #3707) * Improve tests * Prepend note on partial to docstring (see #3707) * Remove print statement * Handle cases where docstring is None
117 lines
4.6 KiB
Python
117 lines
4.6 KiB
Python
# coding: utf8
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from __future__ import unicode_literals
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import functools
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import copy
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from ..errors import Errors
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class Underscore(object):
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mutable_types = (dict, list, set)
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doc_extensions = {}
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span_extensions = {}
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token_extensions = {}
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def __init__(self, extensions, obj, start=None, end=None):
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object.__setattr__(self, "_extensions", extensions)
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object.__setattr__(self, "_obj", obj)
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# Assumption is that for doc values, _start and _end will both be None
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# Span will set non-None values for _start and _end
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# Token will have _start be non-None, _end be None
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# This lets us key everything into the doc.user_data dictionary,
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# (see _get_key), and lets us use a single Underscore class.
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object.__setattr__(self, "_doc", obj.doc)
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object.__setattr__(self, "_start", start)
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object.__setattr__(self, "_end", end)
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def __dir__(self):
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# Hack to enable autocomplete on custom extensions
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extensions = list(self._extensions.keys())
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return ["set", "get", "has"] + extensions
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def __getattr__(self, name):
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if name not in self._extensions:
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raise AttributeError(Errors.E046.format(name=name))
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default, method, getter, setter = self._extensions[name]
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if getter is not None:
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return getter(self._obj)
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elif method is not None:
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method_partial = functools.partial(method, self._obj)
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# Hack to port over docstrings of the original function
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# See https://stackoverflow.com/q/27362727/6400719
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method_docstring = method.__doc__ or ""
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method_docstring_prefix = (
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"This method is a partial function and its first argument "
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"(the object it's called on) will be filled automatically. "
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)
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method_partial.__doc__ = method_docstring_prefix + method_docstring
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return method_partial
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else:
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key = self._get_key(name)
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if key in self._doc.user_data:
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return self._doc.user_data[key]
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elif isinstance(default, self.mutable_types):
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# Handle mutable default arguments (see #2581)
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new_default = copy.copy(default)
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self.__setattr__(name, new_default)
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return new_default
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return default
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def __setattr__(self, name, value):
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if name not in self._extensions:
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raise AttributeError(Errors.E047.format(name=name))
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default, method, getter, setter = self._extensions[name]
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if setter is not None:
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return setter(self._obj, value)
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else:
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self._doc.user_data[self._get_key(name)] = value
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def set(self, name, value):
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return self.__setattr__(name, value)
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def get(self, name):
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return self.__getattr__(name)
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def has(self, name):
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return name in self._extensions
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def _get_key(self, name):
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return ("._.", name, self._start, self._end)
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def get_ext_args(**kwargs):
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"""Validate and convert arguments. Reused in Doc, Token and Span."""
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default = kwargs.get("default")
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getter = kwargs.get("getter")
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setter = kwargs.get("setter")
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method = kwargs.get("method")
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if getter is None and setter is not None:
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raise ValueError(Errors.E089)
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valid_opts = ("default" in kwargs, method is not None, getter is not None)
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nr_defined = sum(t is True for t in valid_opts)
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if nr_defined != 1:
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raise ValueError(Errors.E083.format(nr_defined=nr_defined))
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if setter is not None and not hasattr(setter, "__call__"):
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raise ValueError(Errors.E091.format(name="setter", value=repr(setter)))
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if getter is not None and not hasattr(getter, "__call__"):
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raise ValueError(Errors.E091.format(name="getter", value=repr(getter)))
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if method is not None and not hasattr(method, "__call__"):
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raise ValueError(Errors.E091.format(name="method", value=repr(method)))
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return (default, method, getter, setter)
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def is_writable_attr(ext):
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"""Check if an extension attribute is writable.
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ext (tuple): The (default, getter, setter, method) tuple available via
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{Doc,Span,Token}.get_extension.
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RETURNS (bool): Whether the attribute is writable.
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"""
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default, method, getter, setter = ext
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# Extension is writable if it has a setter (getter + setter), if it has a
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# default value (or, if its default value is none, none of the other values
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# should be set).
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if setter is not None or default is not None or all(e is None for e in ext):
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return True
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return False
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