STb <FuncDecl, Expr, Sort> GenerateEncoder()
{
var ctx = _automataCtx.Z3;
Expr inputVar = _automataCtx.MkVar(0, ctx.MkBitVecSort(8));
Expr registerVar = _automataCtx.MkVar(1, _automataCtx.MkTupleSort());
Sort outputSort = ctx.BoolSort;
var stb = new STb <FuncDecl, Expr, Sort>(_automataCtx, DeclarationType.Name, inputVar.Sort, outputSort, registerVar.Sort, _automataCtx.MkTuple(), 0);
var leafPatterns = new Dictionary <byte, bool[]>();
FindLeafPatterns(leafPatterns, _tree, new Stack <bool>());
var patterns = new bool[256][];
foreach (var entry in leafPatterns)
{
patterns[entry.Key] = entry.Value;
}
Debug.Assert(patterns.Select((x, i) => patterns.Select((y, j) => i == j || x.Length != y.Length || x.Zip(y, (a, b) => Tuple.Create(a, b)).Any(z => z.Item1 != z.Item2)).All(z => z)).All(z => z));
Debug.Assert(patterns.All(x => x != null), "Internal Huffman tree is missing leaves");
stb.AssignRule(0, GetBinarySearchRule(ctx, (BitVecExpr)inputVar, registerVar, patterns, 0, patterns.Length));
stb.AssignFinalRule(0, new BaseRule <Expr>(Sequence <Expr> .Empty, registerVar, 0));
stb = stb.Compose(GenerateToBytes());
stb = stb.ExploreBools();
if (ShowGraphStages.Count > 0)
{
stb.ToST().ShowGraph();
}
return(stb);
}
