labels.py
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"""A plugin to add labels to nodes and nets.
"""
from snakes.plugins import plugin, new_instance
from snakes.pnml import Tree
@plugin("snakes.nets")
def extend (module) :
class Transition (module.Transition) :
def label (self, *get, **set) :
if not hasattr(self, "_labels") :
self._labels = {}
result = tuple(self._labels[g] for g in get)
self._labels.update(set)
if len(get) == 1 :
return result[0]
elif len(get) > 1 :
return result
elif len(set) == 0 :
return self._labels.copy()
def has_label (self, name, *names) :
if len(names) == 0 :
return name in self._labels
else :
return tuple(n in self._labels for n in (name,) + names)
def copy (self, name=None, **options) :
if not hasattr(self, "_labels") :
self._labels = {}
result = module.Transition.copy(self, name, **options)
result._labels = self._labels.copy()
return result
def __pnmldump__ (self) :
"""
>>> t = Transition('t')
>>> t.label(foo='bar', spam=42)
>>> t.__pnmldump__()
<?xml version="1.0" encoding="utf-8"?>
<pnml>
<transition id="t">
<label name="foo">
<object type="str">
bar
</object>
</label>
<label name="spam">
<object type="int">
42
</object>
</label>
</transition>
</pnml>
"""
t = module.Transition.__pnmldump__(self)
if hasattr(self, "_labels") :
for key, val in self._labels.items() :
t.add_child(Tree("label", None,
Tree.from_obj(val),
name=key))
return t
@classmethod
def __pnmlload__ (cls, tree) :
"""
>>> old = Transition('t')
>>> old.label(foo='bar', spam=42)
>>> p = old.__pnmldump__()
>>> new = Transition.__pnmlload__(p)
>>> new
Transition('t', Expression('True'))
>>> new.__class__
<class 'snakes.plugins.labels.Transition'>
>>> new.label('foo', 'spam')
('bar', 42)
"""
t = new_instance(cls, module.Transition.__pnmlload__(tree))
t._labels = dict((lbl["name"], lbl.child().to_obj())
for lbl in tree.get_children("label"))
return t
class Place (module.Place) :
def label (self, *get, **set) :
if not hasattr(self, "_labels") :
self._labels = {}
result = tuple(self._labels[g] for g in get)
self._labels.update(set)
if len(get) == 1 :
return result[0]
elif len(get) > 1 :
return result
elif len(set) == 0 :
return self._labels.copy()
def has_label (self, name, *names) :
if len(names) == 0 :
return name in self._labels
else :
return tuple(n in self._labels for n in (name,) + names)
def copy (self, name=None, **options) :
if not hasattr(self, "_labels") :
self._labels = {}
result = module.Place.copy(self, name, **options)
result._labels = self._labels.copy()
return result
def __pnmldump__ (self) :
"""
>>> p = Place('p')
>>> p.label(foo='bar', spam=42)
>>> p.__pnmldump__()
<?xml version="1.0" encoding="utf-8"?>
<pnml>
<place id="p">
<type domain="universal"/>
<initialMarking>
<multiset/>
</initialMarking>
<label name="foo">
<object type="str">
bar
</object>
</label>
<label name="spam">
<object type="int">
42
</object>
</label>
</place>
</pnml>
"""
t = module.Place.__pnmldump__(self)
if hasattr(self, "_labels") :
for key, val in self._labels.items() :
t.add_child(Tree("label", None,
Tree.from_obj(val),
name=key))
return t
@classmethod
def __pnmlload__ (cls, tree) :
"""
>>> old = Place('p')
>>> old.label(foo='bar', spam=42)
>>> p = old.__pnmldump__()
>>> new = Place.__pnmlload__(p)
>>> new
Place('p', MultiSet([]), tAll)
>>> new.__class__
<class 'snakes.plugins.labels.Place'>
>>> new.label('foo', 'spam')
('bar', 42)
"""
p = new_instance(cls, module.Place.__pnmlload__(tree))
p._labels = dict((lbl["name"], lbl.child().to_obj())
for lbl in tree.get_children("label"))
return p
class PetriNet (module.PetriNet) :
def label (self, *get, **set) :
if not hasattr(self, "_labels") :
self._labels = {}
result = tuple(self._labels[g] for g in get)
self._labels.update(set)
if len(get) == 1 :
return result[0]
elif len(get) > 1 :
return result
elif len(set) == 0 :
return self._labels.copy()
def has_label (self, name, *names) :
if len(names) == 0 :
return name in self._labels
else :
return tuple(n in self._labels for n in (name,) + names)
def copy (self, name=None, **options) :
if not hasattr(self, "_labels") :
self._labels = {}
result = module.PetriNet.copy(self, name, **options)
result._labels = self._labels.copy()
return result
def __pnmldump__ (self) :
"""
>>> n = PetriNet('n')
>>> n.label(foo='bar', spam=42)
>>> n.__pnmldump__()
<?xml version="1.0" encoding="utf-8"?>
<pnml>
<net id="n">
<label name="foo">
<object type="str">
bar
</object>
</label>
<label name="spam">
<object type="int">
42
</object>
</label>
</net>
</pnml>
"""
t = module.PetriNet.__pnmldump__(self)
if hasattr(self, "_labels") :
for key, val in self._labels.items() :
t.add_child(Tree("label", None,
Tree.from_obj(val),
name=key))
return t
@classmethod
def __pnmlload__ (cls, tree) :
"""
>>> old = PetriNet('n')
>>> old.label(foo='bar', spam=42)
>>> p = old.__pnmldump__()
>>> new = PetriNet.__pnmlload__(p)
>>> new
PetriNet('n')
>>> new.__class__
<class 'snakes.plugins.labels.PetriNet'>
>>> new.label('foo', 'spam')
('bar', 42)
"""
n = new_instance(cls, module.PetriNet.__pnmlload__(tree))
n._labels = dict((lbl["name"], lbl.child().to_obj())
for lbl in tree.get_children("label"))
return n
def merge_places (self, target, sources, **options) :
module.PetriNet.merge_places(self, target, sources, **options)
new = self.place(target)
for place in sources :
new.label(**dict(self.place(place).label()))
def merge_transitions (self, target, sources, **options) :
module.PetriNet.merge_transitions(self, target, sources, **options)
new = self.transition(target)
for trans in sources :
new.label(**dict(self.transition(trans).label()))
return Transition, Place, PetriNet