17 lines
812 B
MiniZinc
17 lines
812 B
MiniZinc
predicate fzn_regular_nfa(array[int] of var int: x, int: Q, set of int: S,
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array[int,int] of set of int: d, int: q0, set of int: F) =
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let {
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% If x has index set m..n-1, then a[m] holds the initial state
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% (q0), and a[i+1] holds the state we're in after processing
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% x[i]. If a[n] is in F, then we succeed (ie. accept the string).
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int: m = min(index_set(x)),
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int: n = max(index_set(x)) + 1,
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array[m..n] of var 1..Q: a
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} in
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a[m] = q0 /\ % Set a[0].
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forall(i in index_set(x)) (
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x[i] in S /\ % Do this in case it's a var.
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a[i+1] in d[a[i], x[i]] % Determine a[i+1].
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) /\
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a[n] in F; % Check the final state is in F.
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