/usr/share/pyshared/traits/protocols/generate.py is in python-traits 4.1.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 | """Autogenerated protocols from type+method names, URI, sequence, etc."""
from __future__ import absolute_import
#from interfaces import Protocol, allocate_lock, Interface
from .protocols import (Protocol, allocate_lock, Interface,
declareAdapterForProtocol, declareAdapterForType, declareAdapter, adapt,
NO_ADAPTER_NEEDED)
from .advice import metamethod, supermeta
#from api import declareAdapterForProtocol, declareAdapterForType
#from api import declareAdapter, adapt
#from adapters import NO_ADAPTER_NEEDED
__all__ = [
'protocolForType', 'protocolForURI', 'sequenceOf', 'IBasicSequence',
'URIProtocol', 'TypeSubset', 'WeakSubset', 'ADAPT_SEQUENCE',
'SequenceProtocol'
]
class URIProtocol(Protocol):
"""Protocol representing a URI, UUID, or other unique textual identifier"""
def __init__(self,uri):
self.URI = uri
Protocol.__init__(self)
def __repr__(self):
return "URIProtocol(%r)" % self.URI
def __reduce__(self):
return protocolForURI, (self.URI,)
class TypeSubset(Protocol):
"""Protocol representing some set of a type's methods"""
def __init__(self,baseType,methods):
self.baseType = baseType
self.methods = methods
Protocol.__init__(self)
def __repr__(self):
return "TypeSubset(%r,%r)" % (self.baseType,self.methods)
def __reduce__(self):
return protocolForType, (self.baseType, self.methods, False)
class WeakSubset(TypeSubset,object):
"""TypeSubset that accepts any object with the right attributes"""
__metaclass__ = type # new-style so we can use super()
def __adapt__(self,ob):
result = supermeta(TypeSubset,self).__adapt__(ob)
if result is not None:
return result
for name in self.methods:
if not hasattr(ob,name):
return None
else:
return ob
__adapt__ = metamethod(__adapt__)
def __repr__(self):
return "WeakSubset(%r,%r)" % (self.baseType,self.methods)
def __reduce__(self):
return protocolForType, (self.baseType, self.methods, True)
class SequenceProtocol(Protocol):
"""Protocol representing a "sequence of" some base protocol"""
def __init__(self,baseProtocol):
self.baseProtocol = baseProtocol
Protocol.__init__(self)
def __repr__(self):
return "sequenceOf(%r)" % self.baseProtocol
def __reduce__(self):
return sequenceOf, (self.baseProtocol,)
class IBasicSequence(Interface):
"""Non-string, iterable object sequence"""
def __iter__():
"""Return an iterator over the sequence"""
declareAdapter(
NO_ADAPTER_NEEDED,
provides=[IBasicSequence],
forTypes=[list,tuple]
)
def ADAPT_SEQUENCE(ob, proto):
"""Convert iterable 'ob' into list of objects implementing 'proto'"""
marker = object()
out = []
proto = proto.baseProtocol # get the protocol to adapt to
for item in ob:
item = adapt(item,proto, marker)
if item is marker:
return None # can't adapt unless all members adapt
out.append(item)
return out
__registryLock = allocate_lock()
registry = {}
def protocolForURI(uri):
"""Return a unique protocol object representing the supplied URI/UUID"""
__registryLock.acquire()
try:
try:
return registry[uri]
except KeyError:
proto = registry[uri] = URIProtocol(uri)
return proto
finally:
__registryLock.release()
def protocolForType(baseType, methods=(), implicit=False):
"""Return a protocol representing a subset of methods of a specific type"""
# Normalize 'methods' to a sorted tuple w/no duplicate names
methods = dict([(k,k) for k in methods]).keys()
methods.sort()
methods = tuple(methods)
key = baseType, methods, (not not implicit) # ensure implicit is true/false
return __protocolForType(key)
def sequenceOf(baseProtocol):
"""Return a protocol representing an sequence of a given base protocol"""
key = (sequenceOf, baseProtocol)
__registryLock.acquire()
try:
try:
return registry[key]
except KeyError:
proto = registry[key] = SequenceProtocol(baseProtocol)
declareAdapterForProtocol(
proto, lambda o: ADAPT_SEQUENCE(o,proto), IBasicSequence
)
return proto
finally:
__registryLock.release()
def __protocolForType(key):
"""Recursive implementation of protocolForType; assumes standardized key"""
__registryLock.acquire()
try:
try:
return registry[key]
except KeyError:
baseType, methods, implicit = key
if implicit:
proto = WeakSubset(baseType,methods)
else:
proto = TypeSubset(baseType,methods)
registry[key] = proto
finally:
__registryLock.release()
# declare that proto implies all subset-method protocols
if len(methods)>1:
for method in methods:
subset = tuple([m for m in methods if m!=method])
implied = __protocolForType((baseType, subset, implicit))
declareAdapterForProtocol(implied, NO_ADAPTER_NEEDED, proto)
# declare that explicit form implies implicit form
if implicit:
impliedBy = __protocolForType((baseType, methods, False))
declareAdapterForProtocol(proto, NO_ADAPTER_NEEDED, impliedBy)
# declare that baseType implements this protocol
declareAdapterForType(proto, NO_ADAPTER_NEEDED, baseType)
return proto
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