public override BaseNode VisitFilterExpression(QueryFilteringParser.FilterExpressionContext context)
{
BaseNode resultNode = context.children[0].Accept(this);
for (int i = 1; i < context.children.Count; i += 2)
{
var left = resultNode;
var right = context.children[i + 1].Accept(this);
var aggregateNode = (ITerminalNode)context.children[i];
switch (aggregateNode.Symbol.Type)
{
case QueryFilteringLexer.AND:
resultNode = new AndNode(left, right);
continue;
case QueryFilteringLexer.OR:
resultNode = new OrNode(left, right);
continue;
default:
throw new ParseRuleException(
nameof(FilterExpressionVisitor),
$"неизвестный тип предиката '{aggregateNode.Symbol.Type}'");
}
}
return(resultNode);
}
/// <summary>
/// Visit a parse tree produced by <see cref="QueryFilteringParser.filterExpression"/>.
/// <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 VisitFilterExpression([NotNull] QueryFilteringParser.FilterExpressionContext context)
{
return(VisitChildren(context));
}