private object ProcessFLORExpr(Notation notation, Notation.Record rec)
{
int stack_pos = _varTable.BeginFrame();
Symbol[] arr = Lisp.ToArray<Symbol>(rec.args[0]);
List<FLWORItem> flworItems = new List<FLWORItem>();
bool stable = false;
for (int k = 0; k < arr.Length; k++)
{
Notation.Record[] recs = notation.Select(arr[k]);
switch (recs[0].descriptor)
{
case Descriptor.For:
{
Symbol[] arr2 = Lisp.ToArray<Symbol>(recs[0].args[0]);
for (int s = 0; s < arr2.Length; s++)
{
Notation.Record[] recs2 = notation.Select(arr2[s],
Descriptor.ForClauseOperator, 4);
if (recs.Length > 0)
{
FLWORItem item = new FLWORItem();
item.desc = Descriptor.For;
if (notation.Flag(arr[k], Descriptor.Parallel))
item.parallel = true;
VarName name = (VarName)recs2[0].Arg0;
item.var = ProcessVarName(name);
item.assignExpr = ProcessExprSingle(notation, recs2[0].Arg3);
item.convert = true;
if (recs2[0].Arg1 == null)
{
XQuerySequenceType type = EvalExprType(item.assignExpr);
if (type.TypeCode != XmlTypeCode.Item)
{
item.varType = new XQuerySequenceType(type.TypeCode, XmlTypeCardinality.One);
item.convert = false;
}
else
item.varType = XQuerySequenceType.Item;
}
else
item.varType = ProcessTypeDecl(notation, recs2[0].Arg1);
item.pos = null;
if (recs2[0].Arg2 != null)
{
VarName posname = (VarName)recs2[0].Arg2;
if (posname.Name == name.Name)
throw new XQueryException(Properties.Resources.XQST0089, posname.Name);
item.pos = ProcessVarName(posname);
}
_varTable.PushVar(item.var, item.varType);
if (item.pos != null)
_varTable.PushVar(item.pos, new XQuerySequenceType(XmlTypeCode.Integer));
flworItems.Add(item);
}
}
}
break;
case Descriptor.Let:
{
Symbol[] arr2 = Lisp.ToArray<Symbol>(recs[0].args[0]);
for (int s = 0; s < arr2.Length; s++)
{
Notation.Record[] recs2 = notation.Select(arr2[s],
Descriptor.LetClauseOperator, 3);
if (recs.Length > 0)
{
FLWORItem item = new FLWORItem();
item.desc = Descriptor.Let;
item.var = ProcessVarName((VarName)recs2[0].Arg0);
item.assignExpr = ProcessExprSingle(notation, recs2[0].Arg2);
item.convert = true;
if (recs2[0].Arg1 == null)
{
XQuerySequenceType type = EvalExprType(item.assignExpr);
if (type.Cardinality == XmlTypeCardinality.One)
{
item.varType = type;
item.convert = false;
}
else
item.varType = XQuerySequenceType.Item;
}
else
item.varType = ProcessTypeDecl(notation, recs2[0].Arg1);
_varTable.PushVar(item.var, item.varType);
flworItems.Add(item);
}
}
}
break;
}
}
XQueryOrderSpec[] orderSpec = null;
XQueryExprBase expr = XQueryExpr.Create(_context,
new object[] { ProcessExprSingle(notation, rec.Arg3) });
if (rec.Arg2 != null)
{
Notation.Record[] recs = notation.Select(rec.Arg2, new Descriptor[] {
Descriptor.OrderBy, Descriptor.StableOrderBy });
if (recs.Length > 0)
{
if (!(expr is XQueryExpr))
expr = new XQueryExpr(_context, new object[] { expr.ToLispFunction() });
stable = (recs[0].descriptor == Descriptor.StableOrderBy);
Symbol[] arr3 = Lisp.ToArray<Symbol>(recs[0].args[0]);
orderSpec = new XQueryOrderSpec[arr3.Length];
object[] sortKey = new object[arr3.Length];
for (int k = 0; k < arr3.Length; k++)
{
sortKey[k] = ProcessExprSingle(notation, arr3[k]);
orderSpec[k].emptySpec = _context.EmptyOrderSpec;
orderSpec[k].collation = _context.DefaultCollation;
Notation.Record[] recs1 = notation.Select(arr3[k], Descriptor.Modifier, 1);
if (recs1.Length > 0)
{
Symbol[] modifier = Lisp.ToArray<Symbol>(recs1[0].args[0]);
if (modifier[0] != null)
switch (((TokenWrapper)modifier[0]).Data)
{
case Token.ASCENDING:
orderSpec[k].direction = XQueryOrderDirection.Ascending;
break;
case Token.DESCENDING:
orderSpec[k].direction = XQueryOrderDirection.Descending;
break;
}
if (modifier[1] != null)
switch (((TokenWrapper)modifier[1]).Data)
{
case Token.EMPTY_GREATEST:
orderSpec[k].emptySpec = XQueryEmptyOrderSpec.Greatest;
break;
case Token.EMPTY_LEAST:
orderSpec[k].emptySpec = XQueryEmptyOrderSpec.Least;
break;
}
if (modifier[2] != null)
orderSpec[k].collation = ((Literal)modifier[2]).Data;
}
}
((XQueryExpr)expr).Annotation = sortKey;
}
}
object whereExpr = null;
if (rec.Arg1 != null)
{
Notation.Record[] recs3 = notation.Select(rec.Arg1, Descriptor.Where, 1);
if (recs3.Length > 0)
whereExpr = ProcessExprSingle(notation, recs3[0].Arg0);
}
for (int k = flworItems.Count - 1; k >= 0; k--)
{
FLWORItem item = flworItems[k];
switch (item.desc)
{
case Descriptor.For:
expr = new XQueryFLWOR(_context, item.var, item.varType, item.pos, item.assignExpr, expr, item.convert);
if (item.parallel && _context.EnableHPC)
((XQueryFLWOR)expr).Parallel = true;
break;
case Descriptor.Let:
expr = new XQueryLET(_context, item.var, item.varType, item.assignExpr, expr, item.convert);
break;
}
if (k == flworItems.Count - 1)
{
XQueryFLWORBase flworExpr = (XQueryFLWORBase)expr;
flworExpr.ConditionExpr = whereExpr;
}
}
_varTable.EndFrame(stack_pos);
if (orderSpec != null)
expr = new XQuerySorter(_context, orderSpec, stable, expr);
return Lisp.List(ID.DynExecuteExpr, expr, ID.Context, Lisp.ARGV, Lisp.MPOOL);
}