public static FNodeSet ParseFNodeSet(string Text, MemoryStruct LocalHeap, Workspace Home, string Alias, Schema Columns, Register Memory)
{
// Build text stream //
AntlrInputStream ais = new AntlrInputStream(Text);
HScriptLexer lex = new HScriptLexer(ais);
// Build token tree //
CommonTokenStream cts = new CommonTokenStream(lex);
HScriptParser par = new HScriptParser(cts);
// Build AST //
IParseTree tree = par.expression_alias_list();
if (tree == null)
tree = par.expression_or_wildcard_set();
// Visit each node getting the final node //
ExpressionVisitor v = new ExpressionVisitor(LocalHeap, Home);
v.AddSchema(Alias, Columns, Memory);
if (tree is HScriptParser.Expression_or_wildcard_setContext)
{
HScriptParser.Expression_or_wildcard_setContext a = tree as HScriptParser.Expression_or_wildcard_setContext;
return VisitorHelper.GetReturnStatement(v, a);
}
else if (tree is HScriptParser.Expression_alias_listContext)
{
HScriptParser.Expression_alias_listContext b = tree as HScriptParser.Expression_alias_listContext;
return v.ToNodes(b);
}
throw new Exception("Expression is not an expression set: " + Text);
}
