INode ParseSymbol()
{
if (CurrToken == Token.ReservedWord)
{
var name = CurrSpan.AsString(_source);
Next();
switch (name)
{
case "$filter": return(new SymbolNode(Symbol.Filter));
case "$select": return(new SymbolNode(Symbol.Select));
case "$top": return(new SymbolNode(Symbol.Top));
case "$skip": return(new SymbolNode(Symbol.Skip));
case "$orderby": return(new SymbolNode(Symbol.OrderBy));
case "$count": return(new SymbolNode(Symbol.Count));
default: throw new InvalidOperationException("Unhandled symbol encountered");
}
}
return(null);
}
INode ParseBinary(INode leftNode)
{
if (CurrToken == Token.Space && NextToken == Token.Word)
{
var op = GetOperator(NextSpan.AsString(_source));
var opPrecedence = GetPrecedence(op);
if (CurrGreed >= opPrecedence)
{
Skip(Token.Space);
Skip(Token.Word);
Skip(Token.Space);
_stGreed.Push(opPrecedence);
var rightNode = ParseNode();
_stGreed.Pop();
return(new BinaryOperatorNode(op, leftNode, rightNode));
}
}
return(null);
}
