mirror of
https://github.com/morpheus65535/bazarr
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84 lines
2.5 KiB
Python
84 lines
2.5 KiB
Python
#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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# Copyright 2014 True Blade Systems, Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Original:
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# - https://bitbucket.org/ericvsmith/toposort (1.4)
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# Modifications:
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# - merged Pull request #2 for CyclicDependency error
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# - import reduce as original name
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# - support python 2.6 dict comprehension
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# pylint: skip-file
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from functools import reduce
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class CyclicDependency(ValueError):
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def __init__(self, cyclic):
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s = 'Cyclic dependencies exist among these items: {0}'.format(', '.join(repr(x) for x in cyclic.items()))
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super().__init__(s)
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self.cyclic = cyclic
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def toposort(data):
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"""
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Dependencies are expressed as a dictionary whose keys are items
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and whose values are a set of dependent items. Output is a list of
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sets in topological order. The first set consists of items with no
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dependences, each subsequent set consists of items that depend upon
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items in the preceeding sets.
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:param data:
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:type data:
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:return:
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:rtype:
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"""
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# Special case empty input.
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if len(data) == 0:
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return
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# Copy the input so as to leave it unmodified.
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data = data.copy()
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# Ignore self dependencies.
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for k, v in data.items():
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v.discard(k)
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# Find all items that don't depend on anything.
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extra_items_in_deps = reduce(set.union, data.values()) - set(data.keys())
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# Add empty dependences where needed.
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data.update(dict((item, set()) for item in extra_items_in_deps))
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while True:
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ordered = set(item for item, dep in data.items() if len(dep) == 0)
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if not ordered:
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break
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yield ordered
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data = dict((item, (dep - ordered))
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for item, dep in data.items()
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if item not in ordered)
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if len(data) != 0:
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raise CyclicDependency(data)
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def toposort_flatten(data, sort=True):
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"""
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Returns a single list of dependencies. For any set returned by
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toposort(), those items are sorted and appended to the result (just to
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make the results deterministic).
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:param data:
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:type data:
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:param sort:
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:type sort:
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:return: Single list of dependencies.
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:rtype: list
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"""
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result = []
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for d in toposort(data):
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result.extend((sorted if sort else list)(d))
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return result
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