/// <summary>
/// Validate a quantified expression.
/// </summary>
/// <param name="qex">
/// is the quantified expression. </param>
/// <returns> null. </returns>
public virtual object visit(QuantifiedExpr qex)
{
// lets cheat
doForExpr(qex.iterator(), qex.expr());
return(null);
}
///
/// <param name="qex">
/// is the Quantified expression. </param>
/// <returns> qex expression. </returns>
public virtual object visit(QuantifiedExpr qex)
{
for (IEnumerator <VarExprPair> i = qex.iterator(); i.MoveNext();)
{
i.Current.expr().accept(this);
}
qex.expr().accept(this);
return(null);
}
///
/// <param name="qex">
/// is the Quantified expression. </param>
/// <returns> qex expression. </returns>
// XXX: code duplication
public virtual object visit(QuantifiedExpr qex)
{
QuantifiedExpr last = qex;
Expr ret = qex.expr();
int depth = 0;
for (IEnumerator i = qex.iterator(); i.MoveNext();)
{
VarExprPair ve = (VarExprPair)i.Current;
// ok we got nested fors...
if (depth > 0)
{
var pairs = new List <VarExprPair>();
pairs.Add(ve);
QuantifiedExpr qe = new QuantifiedExpr(qex.type(), pairs, ret);
last.set_expr(qe);
last = qe;
}
depth++;
}
// normalize return value, and set it to the last for expr
ret.accept(this);
// get rid of the pairs in the parent (original) for
if (depth > 1)
{
qex.truncate_pairs();
}
return(qex);
}
