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twa_graph: swap the two passes of merge_edges()

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This improves the determinism in a few cases.

* spot/twa/twagraph.cc (merge_edges): Encapsulate the two
passes into lambdas so that they are very easy to swap.
* spot/twa/twagraph.hh (merge_edges): Adjust documentation.
* tests/python/mergedge.py: Add test case.
* tests/core/alternating.test, tests/python/alternation.ipynb:
Determinism was improved.
* tests/core/parity2.test, tests/core/readsave.test,
tests/core/sbacc.test, tests/python/_product_susp.ipynb,
tests/python/atva16-fig2a.ipynb, tests/python/decompose.ipynb,
tests/python/highlighting.ipynb, tests/python/satmin.ipynb,
tests/python/simstate.py: Adjust expected order of edges.
* NEWS: Mention the change.
This commit is contained in:
Alexandre Duret-Lutz 2021-01-19 20:58:04 +01:00
parent e8e31c2723
commit 2072151499
15 changed files with 1963 additions and 1896 deletions
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27
tests/python/mergedge.py
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@ -26,3 +26,30 @@ Acceptance: 1 Inf(0) --BODY-- State: 0 [0] 0 [0] 0 {0} --END--""")
assert aut.num_edges() == 2
aut.merge_edges()
assert aut.num_edges() == 1
aut = spot.automaton("""
HOA: v1
States: 2
Start: 0
AP: 2 "p0" "p1"
acc-name: Buchi
Acceptance: 1 Inf(0)
properties: trans-labels explicit-labels trans-acc complete
--BODY--
State: 0
[!0] 0 {0}
[0] 1 {0}
State: 1
[!0&!1] 0 {0}
[0 | 1] 1
[0&!1] 1 {0}
--END--""")
assert aut.num_edges() == 5
aut.merge_edges()
assert aut.num_edges() == 5
assert not spot.is_deterministic(aut)
aut = spot.split_edges(aut)
assert aut.num_edges() == 9
aut.merge_edges()
assert aut.num_edges() == 5
assert spot.is_deterministic(aut)