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57 lines (48 loc) · 1.87 KB
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# Copyright (c) 2008-2009 Pedro Matiello <pmatiello@gmail.com>
# Salim Fadhley <sal@stodge.org>
#
# Permission is hereby granted, free of charge, to any person
# obtaining a copy of this software and associated documentation
# files (the "Software"), to deal in the Software without
# restriction, including without limitation the rights to use,
# copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the
# Software is furnished to do so, subject to the following
# conditions:
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
# OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
# HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
# WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
# OTHER DEALINGS IN THE SOFTWARE.
"""
Exceptions.
"""
class GraphError(RuntimeError):
"""
A base-class for the various kinds of errors that occur in the the python-graph class.
"""
pass
class AdditionError(GraphError):
"""
This error is raised when trying to add a node or edge already added to the graph or digraph.
"""
pass
class NodeUnreachable(GraphError):
"""
Goal could not be reached from start.
"""
def __init__(self, start, goal):
msg = "Node %s could not be reached from node %s" % ( repr(goal), repr(start) )
InvalidGraphType.__init__(self, msg)
self.start = start
self.goal = goal
class InvalidGraphType(GraphError):
"""
Invalid graph type.
"""
pass