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df19e2bff6
<!--- Provide a general summary of your changes in the title. -->
## Description
This PR adds the abilility to override custom extension attributes during merging. This will only work for attributes that are writable, i.e. attributes registered with a default value like `default=False` or attribute that have both a getter *and* a setter implemented.
```python
Token.set_extension('is_musician', default=False)
doc = nlp("I like David Bowie.")
with doc.retokenize() as retokenizer:
attrs = {"LEMMA": "David Bowie", "_": {"is_musician": True}}
retokenizer.merge(doc[2:4], attrs=attrs)
assert doc[2].text == "David Bowie"
assert doc[2].lemma_ == "David Bowie"
assert doc[2]._.is_musician
```
### Types of change
enhancement
## Checklist
<!--- Before you submit the PR, go over this checklist and make sure you can
tick off all the boxes. [] -> [x] -->
- [x] I have submitted the spaCy Contributor Agreement.
- [x] I ran the tests, and all new and existing tests passed.
- [x] My changes don't require a change to the documentation, or if they do, I've added all required information.
93 lines
3.5 KiB
Python
93 lines
3.5 KiB
Python
# coding: utf8
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from __future__ import unicode_literals
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import functools
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from ..errors import Errors
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class Underscore(object):
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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 __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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return functools.partial(method, self._obj)
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else:
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return self._doc.user_data.get(self._get_key(name), 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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