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Diffstat (limited to 'test/gen-threads.py')
-rw-r--r-- | test/gen-threads.py | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/test/gen-threads.py b/test/gen-threads.py new file mode 100644 index 00000000..9fbb8474 --- /dev/null +++ b/test/gen-threads.py @@ -0,0 +1,33 @@ +# Generate all possible single-root message thread structures of size +# argv[1]. Each output line is a thread structure, where the n'th +# field is either a number giving the parent of message n or "None" +# for the root. + +import sys +from itertools import chain, combinations + +def subsets(s): + return chain.from_iterable(combinations(s, r) for r in range(len(s)+1)) + +nodes = set(range(int(sys.argv[1]))) + +# Queue of (tree, free, to_expand) where tree is a {node: parent} +# dictionary, free is a set of unattached nodes, and to_expand is +# itself a queue of nodes in the tree that need to be expanded. +# The queue starts with all single-node trees. +queue = [({root: None}, nodes - {root}, (root,)) for root in nodes] + +# Process queue +while queue: + tree, free, to_expand = queue.pop() + + if len(to_expand) == 0: + # Only print full-sized trees + if len(free) == 0: + print(" ".join(map(str, [msg[1] for msg in sorted(tree.items())]))) + else: + # Expand node to_expand[0] with each possible set of children + for children in subsets(free): + ntree = dict(tree, **{child: to_expand[0] for child in children}) + nfree = free.difference(children) + queue.append((ntree, nfree, to_expand[1:] + tuple(children))) |