public override BaseNode VisitFunction(QueryFilteringParser.FunctionContext context)
{
var parameters = context.atom().Select(x => x.Accept(this)).ToArray();
switch (context.value.Type)
{
case QueryFilteringParser.TOUPPER:
return(new ToUpperNode(parameters));
case QueryFilteringParser.TOLOWER:
return(new ToLowerNode(parameters));
case QueryFilteringParser.STARTSWITH:
return(new StartsWithNode(parameters));
case QueryFilteringParser.ENDSWITH:
return(new EndsWithNode(parameters));
default:
throw new ParseRuleException(
nameof(FilterExpressionVisitor),
$"неизвестный тип функции '{context.value.Type}'");
}
}
/// <summary>
/// Visit a parse tree produced by <see cref="QueryFilteringParser.function"/>.
/// <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 VisitFunction([NotNull] QueryFilteringParser.FunctionContext context)
{
return(VisitChildren(context));
}
