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from ... import _class_placeholder |
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from ... import _doc_wrapper |
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from .. import matchable |
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from . import common |
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@_doc_wrapper.DocWrapper.wrap_class |
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class Property(common.Descriptor): |
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"""Decorator with value-based dispatch. Acts as a property.""" |
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fset = None |
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fdel = None |
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protected = False |
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def __new__(cls, func=None, fset=None, fdel=None, doc=None, *args, **kwargs): |
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del fset, fdel, doc |
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return super().__new__(cls, func, *args, **kwargs) |
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def __init__(self, func=None, fset=None, fdel=None, doc=None, *args, **kwargs): |
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del func |
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super().__init__(*args, **kwargs) |
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self.fset = fset |
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self.fdel = fdel |
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if doc is not None: |
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self.__doc__ = doc |
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self.get_matchers = [] |
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self.set_matchers = [] |
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self.delete_matchers = [] |
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self.protected = True |
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def _matchers(self): |
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yield self.get_matchers |
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yield self.set_matchers |
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yield self.delete_matchers |
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def __setattr__(self, name, value): |
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if self.protected and name != "__doc__": |
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raise AttributeError |
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super().__setattr__(name, value) |
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def __delattr__(self, name): |
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if self.protected and name != "__doc__": |
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raise AttributeError |
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super().__delattr__(name) |
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def getter(self, getter): |
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"""Return a copy of self with the getter replaced.""" |
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new = Property(getter, self.fset, self.fdel, self.__doc__) |
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new.get_matchers.extend(self.get_matchers) |
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new.set_matchers.extend(self.set_matchers) |
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new.delete_matchers.extend(self.delete_matchers) |
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return new |
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def setter(self, setter): |
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"""Return a copy of self with the setter replaced.""" |
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new = Property(self.__wrapped__, setter, self.fdel, self.__doc__) |
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new.get_matchers.extend(self.get_matchers) |
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new.set_matchers.extend(self.set_matchers) |
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new.delete_matchers.extend(self.delete_matchers) |
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return new |
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def deleter(self, deleter): |
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"""Return a copy of self with the deleter replaced.""" |
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new = Property(self.__wrapped__, self.fset, deleter, self.__doc__) |
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new.get_matchers.extend(self.get_matchers) |
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new.set_matchers.extend(self.set_matchers) |
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new.delete_matchers.extend(self.delete_matchers) |
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return new |
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def __get__(self, instance, owner): |
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if instance is None: |
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return self |
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matchable_ = matchable.Matchable(instance) |
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for (structure, func) in self.get_matchers: |
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if matchable_(structure): |
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return func(**matchable_.matches) |
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if self.__wrapped__ is None: |
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raise ValueError(self) |
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return self.__wrapped__(instance) |
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def __set__(self, instance, value): |
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matchable_ = matchable.Matchable((instance, value)) |
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for (structure, func) in self.set_matchers: |
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if matchable_(structure): |
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func(**matchable_.matches) |
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return |
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if self.fset is None: |
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raise ValueError((instance, value)) |
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self.fset(instance, value) |
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def __delete__(self, instance): |
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matchable_ = matchable.Matchable(instance) |
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for (structure, func) in self.delete_matchers: |
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if matchable_(structure): |
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func(**matchable_.matches) |
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return |
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if self.fdel is None: |
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raise ValueError(instance) |
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self.fdel(instance) |
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def get_when(self, instance): |
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"""Add a binding to the getter.""" |
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return common.decorate(self.get_matchers, instance) |
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def set_when(self, instance, value): |
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"""Add a binding to the setter.""" |
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return common.decorate(self.set_matchers, _placeholder_tuple2(instance, value)) |
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def delete_when(self, instance): |
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"""Add a binding to the deleter.""" |
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return common.decorate(self.delete_matchers, instance) |
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def _fst_placeholder(fst, snd): |
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@_class_placeholder.placeholder |
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def _placeholder(cls): |
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return (fst(cls), snd) |
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return _placeholder |
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def _snd_placeholder(fst, snd): |
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@_class_placeholder.placeholder |
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def _placeholder(cls): |
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return (fst, snd(cls)) |
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return _placeholder |
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def _both_placeholder(fst, snd): |
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@_class_placeholder.placeholder |
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def _placeholder(cls): |
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return (fst(cls), snd(cls)) |
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return _placeholder |
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_PLACEHOLDERS = { |
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(True, False): _fst_placeholder, |
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(False, True): _snd_placeholder, |
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(True, True): _both_placeholder, |
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} |
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def _placeholder_tuple2(fst, snd): |
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_placeholder = _PLACEHOLDERS.get( |
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(_class_placeholder.is_placeholder(fst), _class_placeholder.is_placeholder(snd)) |
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) |
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if _placeholder: |
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return _placeholder(fst, snd) |
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return (fst, snd) |
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mwchase /
python-structured-data
