public override AttributeDefinition VisitAttribute_name_part(V1QueryParser.Attribute_name_partContext context)
{
var attributeName = context.NAME().GetText();
var downcast = context.downcast()?.asset_type_token().GetText();
var filter = context.attribute_filter();
AttributeDefinition result;
if (!_metaModel.TryGetAttributeDefinition(_rootAssetType, attributeName, out result))
{
throw new InvalidOperationException($"Cannot find attribute definition {_rootAssetType.Token}.{attributeName}");
}
if (!string.IsNullOrEmpty(downcast))
{
var downcastAssetType = _metaModel.GetAssetType(downcast);
result = result.CreateDowncastAttributeDefinition(downcastAssetType);
}
if (filter != null)
{
var subVisitor = new FilterVisitor(result.RelatedAssetType, _metaModel);
var subFilter = subVisitor.Visit(filter);
result = result.CreateFilteredAttributeDefinition(subFilter);
}
return(result);
}
public static FilterTerm ParseFilter(string filterToken, AssetType assetType, MetaModel metaModel)
{
ICharStream charStream = new AntlrInputStream(filterToken);
ITokenSource tokenSource = new V1QueryLexer(charStream);
ITokenStream tokenStream = new CommonTokenStream(tokenSource);
var parser = new V1QueryParser(tokenStream);
var expression = parser.filter_expression();
var visitor = new FilterVisitor(assetType, metaModel);
return(visitor.Visit(expression));
}