def _get(self, handle, node="", edge="", subg=""):
""" Gets Graphviz.<Type> items from parent graph (given by handle).
"""
# Default return value if item is not found
head, tail = '', ''
if edge:
head, tail = edge
node, head, tail, subg = map(encode_page, [node, head, tail, subg])
graphvizitem = None
if head and tail:
item = gv.findedge(gv.findnode(handle, head),
gv.findnode(handle, tail))
if item:
graphvizitem = GraphvizEdge(self, item)
elif node:
item = gv.findnode(handle, node)
if item:
graphvizitem = GraphvizNode(self, item)
elif subg:
item = gv.findsubg(handle, subg)
if item:
graphvizitem = GraphvizSubgraph(self, item)
else:
raise ValueError("No graph element type specified")
return graphvizitem
def _del(self, handle="", node="", edge="", subg=""):
""" Deletes items.
Finds the item handle by type, if necessary, and removes the
item from graph
"""
head, tail = '', ''
if edge:
head, tail = edge
node, head, tail, subg = map(encode_page, [node, head, tail, subg])
self.changed = 1
if head and tail:
item = gv.findedge(gv.findnode(handle, head),
gv.findnode(handle, tail))
elif node:
item = gv.findnode(handle, node)
elif subg:
item = gv.findsubg(handle, subg)
elif handle:
item = handle
else:
raise ValueError("No graph element or element type specified")
if item:
gv.rm(item)
def _setattrs(self, handle="",
edge="", node="", subg="", proto="",
**attrs):
""" Sets attributes for item by handle or by name and type
Finds the item handle by type, if necessary, and sets given
attributes.
"""
head, tail = '', ''
if edge:
head, tail = edge
node, head, tail, subg = map(encode_page, [node, head, tail, subg])
self.changed = 1
if proto in ["node", "edge"]:
# Gets handle when called from Subraphs.set()
if subg:
handle = gv.findsubg(self.handle, subg)
# Called by self.set() and GraphvizSubgraph.set(), handle known
item = getattr(gv, "proto%s" % proto)(handle)
# print "item = gv.proto" + proto + "(g)"
elif head and tail:
item = gv.findedge(gv.findnode(handle, head),
gv.findnode(handle, tail))
# print "item = gv.findedge(gv.findnode(g, '" + head + "')," + \
# "gv.findnode(g, '" + tail + "'))"
elif node:
item = gv.findnode(handle, node)
# print "item = gv.findnode(g, '" + node + "')"
elif subg:
item = gv.findsubg(handle, subg)
# print "item = gv.findsubg(g, '" + subg + "')"
elif handle:
item = handle
else:
raise ValueError("No graph element or element type specified")
for key, elem in attrs.iteritems():
if isinstance(elem, set):
for e in elem:
key, e = map(encode_page, [key, e])
gv.setv(item, key, e)
else:
key, elem = map(encode_page, [key, elem])
gv.setv(item, key, elem)