public List <Expression> GetLeafData()
{
Contract.Ensures(Contract.Result <List <Expression> >() != null);
List <Expression> leafs = new List <Expression>();
if (IsLeaf())
{
leafs.Add(Data);
}
else
{
leafs.AddRange(LChild.GetLeafData());
if (RChild != null)
{
leafs.AddRange(RChild.GetLeafData());
}
}
return(leafs);
}
public static bool IsResolvable(ExpressionTree expt, ProofState state)
{
Contract.Requires(expt.IsRoot());
var leafs = expt.GetLeafData();
if (leafs == null)
{
throw new ArgumentNullException(nameof(leafs));
}
foreach (var leaf in leafs)
{
if (leaf is NameSegment)
{
var ns = leaf as NameSegment;
if (state.ContainTacnyVal(ns))
{
var local = state.GetTacnyVarValue(ns);
if (local is ApplySuffix || local is IVariable || local is NameSegment || local is Statement)
{
return(false);
}
}
else
{
return(false);
}
}
else if (!(leaf is LiteralExpr))
{
if (leaf is ApplySuffix)
{
return(false);
}
}
}
return(true);
}
public static bool IsResolvable(ExpressionTree expt, ProofState state) {
Contract.Requires(expt.IsRoot());
var leafs = expt.GetLeafData();
if (leafs == null) throw new ArgumentNullException(nameof(leafs));
foreach (var leaf in leafs) {
if (leaf is NameSegment) {
var ns = leaf as NameSegment;
if (state.ContainTacnyVal(ns)) {
var local = state.GetTacnyVarValue(ns);
if (local is ApplySuffix || local is IVariable || local is NameSegment || local is Statement)
return false;
} else {
return false;
}
} else if (!(leaf is LiteralExpr)) {
if (leaf is ApplySuffix) {
return false;
}
}
}
return true;
}