public void ExitQueryExpression(QueryParser.QueryExpressionContext context)
{
var operators = context.UNION_EXCEPT();
CompileLeftAssociativeOperator(operators, _queries, (op, left, right) =>
{
if (string.Equals(op.Symbol.Text, "union", StringComparison.OrdinalIgnoreCase))
{
var union = left.Union(right);
return(union);
}
Trace.Assert(string.Equals(
op.Symbol.Text,
"except",
StringComparison.OrdinalIgnoreCase
), $"Expecting UNION or EXCEPT, got {op.Symbol.Text}");
var except = left.Except(right);
return(except);
});
}
/// <summary>
/// Exit a parse tree produced by <see cref="QueryParser.queryExpression"/>.
/// <para>The default implementation does nothing.</para>
/// </summary>
/// <param name="context">The parse tree.</param>
public virtual void ExitQueryExpression([NotNull] QueryParser.QueryExpressionContext context)
{
}
// All methods in this group are either no-ops or they pop 1 or more queries from the
// _queries stack and push one query to the _queries stack as a result of an operation.
public void EnterQueryExpression(QueryParser.QueryExpressionContext context)
{
}
