public static bool Render(Node n, out string expression, CancellationToken cancel)
{
var data = new PrintData();
var success = new SuccessToken();
Factory.Instance.ToAST(n).Compute <PrintData, bool>(
data,
(m, d) => Unfold(m, d, success),
(m, v, children) => true,
cancel);
expression = data.Builder.ToString().Trim();
return(success.Succeeded);
}
private static IEnumerable <Tuple <Node, PrintData> > Unfold(Node n, PrintData d, SuccessToken success)
{
string typename, tag;
Node type, prms;
BigInteger dimen;
bool isConst, isVolatile;
if (IsBaseType(n, out typename))
{
d.Builder.Insert(0, d.ModifierString + typename + " ");
d.ClearModifiers();
yield break;
}
else if (IsNamedType(n, out tag, out typename))
{
d.Builder.Insert(0, d.ModifierString + tag + typename + " ");
d.ClearModifiers();
yield break;
}
else if (IsQualType(n, out type, out isConst, out isVolatile))
{
var dnext = new PrintData(d);
dnext.IsConstModified |= isConst;
dnext.IsVolatileModified |= isVolatile;
yield return(new Tuple <Node, PrintData>(type, dnext));
}
else if (IsPtrType(n, out type))
{
d.Builder.Insert(0, d.IsModified ? "* " + d.ModifierString : "*");
d.ClearModifiers();
var dnext = new PrintData(d);
dnext.WasPtrExpression = true;
yield return(new Tuple <Node, PrintData>(type, dnext));
}
else if (IsArrayType(n, out type, out dimen))
{
if (d.IsModified)
{
success.Failed();
yield break;
}
if (d.WasPtrExpression)
{
if (d.Builder[d.Builder.Length - 1] == ' ')
{
d.Builder.Remove(d.Builder.Length - 1, 1);
}
d.Builder.Insert(0, "(");
d.Builder.Append(")");
}
if (dimen.Sign < 0)
{
d.Builder.Append("[]");
}
else
{
d.Builder.Append("[" + dimen.ToString() + "]");
}
var dnext = new PrintData(d);
dnext.WasPtrExpression = false;
yield return(new Tuple <Node, PrintData>(type, dnext));
}
else if (IsFuncType(n, out type, out prms))
{
if (d.IsModified)
{
success.Failed();
yield break;
}
if (d.WasPtrExpression)
{
if (d.Builder[d.Builder.Length - 1] == ' ')
{
d.Builder.Remove(d.Builder.Length - 1, 1);
}
d.Builder.Insert(0, "(");
d.Builder.Append(")");
}
d.Builder.Append("(");
string prmRender;
bool isPrms = false, isFirst = true, isEllipse = false;
Node prmtype, tail;
while ((isPrms = IsFunPrms(prms, out prmtype, out tail, out isEllipse)))
{
if (isFirst)
{
isFirst = false;
}
else
{
d.Builder.Append(", ");
}
if (!Render(prmtype, out prmRender, default(CancellationToken)))
{
isPrms = false;
break;
}
else
{
d.Builder.Append(prmRender);
}
if (tail == null)
{
break;
}
else
{
prms = tail;
}
}
if (isEllipse)
{
d.Builder.Append(", ...");
}
d.Builder.Append(")");
if (!isPrms)
{
success.Failed();
yield break;
}
var dnext = new PrintData(d);
dnext.WasPtrExpression = false;
yield return(new Tuple <Node, PrintData>(type, dnext));
}
else
{
success.Failed();
yield break;
}
}
