public override FilterDefinition <T> VisitIsNull([NotNull] FilterParser.IsNullContext context) { string id = context.ID().GetText(); var op = context.op.Type; switch (op) { case FilterParser.EQ: return(_builder.Eq <string>(id, null)); case FilterParser.NE: return(_builder.Ne <string>(id, null)); default: throw new InvalidOperationException($"Invalid StringOp {context.GetText()}"); } }
/// <summary> /// Visit a parse tree produced by the <c>IsNull</c> /// labeled alternative in <see cref="FilterParser.expr"/>. /// <para> /// The default implementation returns the result of calling <see cref="AbstractParseTreeVisitor{Result}.VisitChildren(IRuleNode)"/> /// on <paramref name="context"/>. /// </para> /// </summary> /// <param name="context">The parse tree.</param> /// <return>The visitor result.</return> public virtual Result VisitIsNull([NotNull] FilterParser.IsNullContext context) { return(VisitChildren(context)); }