private static AstFilter Translate(TranslationContext context, Expression inputExpression, Regex regex)
{
var inputFieldAst = ExpressionToFilterFieldTranslator.Translate(context, inputExpression);
var regularExpression = new BsonRegularExpression(regex);
return(AstFilter.Regex(inputFieldAst, regularExpression.Pattern, regularExpression.Options));
}
public void AstFilter_should_handle_nested_elemMatch()
{
var ast = AstFilter.ElemMatch(
new AstFilterField("Details.A", BsonValueSerializer.Instance),
AstFilter.ElemMatch(
new AstFilterField("@<elem>", BsonValueSerializer.Instance),
AstFilter.Regex(new AstFilterField("DeviceName", BsonValueSerializer.Instance), ".Name0.", "")));
var rendered = ast.Render();
rendered.Should().Be("{ 'Details.A' : { $elemMatch : { $elemMatch : { DeviceName : /.Name0./ } } } }");
}
private static AstFilter Translate(TranslationContext context, Expression expression, Expression inputExpression, Regex regex)
{
var inputFieldAst = ExpressionToFilterFieldTranslator.Translate(context, inputExpression);
var regularExpression = new BsonRegularExpression(regex);
if (inputFieldAst.Serializer is IRepresentationConfigurable representationConfigurable &&
representationConfigurable.Representation != BsonType.String)
{
throw new ExpressionNotSupportedException(inputExpression, expression, because: $"field \"{inputFieldAst.Path}\" is not represented as a string");
}
return(AstFilter.Regex(inputFieldAst, regularExpression.Pattern, regularExpression.Options));
}
// private static methods
private static AstFilter CreateRegexFilter(AstFilterField field, Modifiers modifiers, string pattern)
{
var combinedPattern = "^" + modifiers.LeadingPattern + pattern + modifiers.TrailingPattern + "$";
if (combinedPattern.StartsWith("^.*"))
{
combinedPattern = combinedPattern.Substring(3);
}
if (combinedPattern.EndsWith(".*$"))
{
combinedPattern = combinedPattern.Substring(0, combinedPattern.Length - 3);
}
var options = CreateRegexOptions(modifiers);
return(AstFilter.Regex(field, combinedPattern, options));
}