public override string /*!*/ ToString(Element /*!*/ element)
{
//Contract.Requires(element != null);
Contract.Ensures(Contract.Result <string>() != null);
Elt e = (Elt)element;
if (IsTop(e))
{
return("<top>");
}
if (IsBottom(e))
{
return("<bottom>");
}
int k = 0;
System.Text.StringBuilder buffer = new System.Text.StringBuilder();
foreach (IVariable /*!*/ key in e.SortedVariables(variableComparer))
{
Contract.Assert(key != null);
if (k++ > 0)
{
buffer.Append("; ");
}
buffer.AppendFormat("{0} = {1}", key, e[key]);
}
return(buffer.ToString());
}
public override IExpr /*!*/ ToPredicate(Element /*!*/ element)
{
//Contract.Requires(element != null);
Contract.Ensures(Contract.Result <IExpr>() != null);
if (IsTop(element))
{
return(propExprFactory.True);
}
if (IsBottom(element))
{
return(propExprFactory.False);
}
Elt e = (Elt)element;
IExpr truth = propExprFactory.True;
IExpr result = truth;
foreach (IVariable /*!*/ variable in e.SortedVariables(variableComparer))
{
Contract.Assert(variable != null);
Element value = (Element)e[variable];
if (value == null || this.microLattice.IsTop(value))
{
continue;
} // Skip variables about which we know nothing.
if (this.microLattice.IsBottom(value))
{
return(propExprFactory.False);
}
IExpr conjunct = this.microLattice.ToPredicate(variable, value);
result = (result == truth) ? (IExpr)conjunct : (IExpr)propExprFactory.And(result, conjunct);
}
return(result);
}