///
/// <param name="fex">
/// is the For expression. </param>
/// <returns> fex expression. </returns>
public virtual object visit(ForExpr fex)
{
for (IEnumerator <VarExprPair> i = fex.iterator(); i.MoveNext();)
{
i.Current.expr().accept(this);
}
fex.expr().accept(this);
return(null);
}
///
/// <param name="fex">
/// is the For expression. </param>
/// <returns> fex expression. </returns>
public virtual object visit(ForExpr fex)
{
ForExpr last = fex;
Expr ret = fex.expr();
int depth = 0;
for (IEnumerator i = fex.iterator(); i.MoveNext();)
{
VarExprPair ve = (VarExprPair)i.Current;
// ok we got nested fors...
if (depth > 0)
{
var pairs = new List <VarExprPair>();
pairs.Add(ve);
ForExpr fe = new ForExpr(pairs, ret);
last.set_expr(fe);
last = fe;
}
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)
{
fex.truncate_pairs();
}
return(fex);
}
/// <summary>
/// Validate a for expression.
/// </summary>
/// <param name="fex">
/// is the for expression. </param>
/// <returns> null. </returns>
public virtual object visit(ForExpr fex)
{
doForExpr(fex.iterator(), fex.expr());
return(null);
}