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bucket.py
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bucket.py
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from urllib.parse import quote_plus, unquote_plus
class Bucket:
"""A bucket is a mutable container for an optionally named scalar value."""
__slots__ = ('name', 'value', 'sep', 'valid')
def __init__(self, name, value='', sep="=", strict=False):
self.valid = True
self.sep = sep
if not value:
if isinstance(name, str):
if name.count(sep) > 1:
if strict: raise ValueError(f"Multiple occurrences of separator {sep!r} in: '{name}'")
self.valid = False
name, value = self.split(name)
elif isinstance(name, Bucket):
name, value = name.name, name.value
else:
name, value = name
self.name = name
self.value = value
def __eq__(self, other):
return str(self) == str(other)
def __ne__(self, other):
return not str(self) == str(other)
def split(self, string):
name, match, value = string.partition(self.sep)
name = unquote_plus(name)
value = unquote_plus(value)
return name if match else None, value if match else name
def __repr__(self):
return "{}({})".format(
self.__class__.__name__,
str(self)
)
def __iter__(self):
if self.name is not None: # XXX: Confirm that empty string is permissible.
yield self.name
yield self.value
def __len__(self):
return 1 if self.name is None else 2
def __str__(self):
# Certain symbols are explicitly allowed, ref: http://pretty-rfc.herokuapp.com/RFC3986#query
iterator = (quote_plus(i.encode('utf8')).replace('%3F', '?').replace('%2F', '/') for i in self) if self.valid else self
return self.sep.join(iterator)