using System; using System.Globalization; using System.Runtime.CompilerServices; namespace NUnit.Framework.Constraints { [NullableContext(1)] [Nullable(0)] public class SubstringConstraint : StringConstraint { public SubstringConstraint(string expected) : base(expected) { descriptionText = "String containing"; } public new SubstringConstraint Using(StringComparison comparisonType) { return (SubstringConstraint)base.Using(comparisonType); } [NullableContext(2)] protected override bool Matches(string actual) { if (actual != null) return actual.IndexOf(expected) >= 0; return false; } [NullableContext(2)] protected override bool Matches(string actual, StringComparison stringComparison) { if (actual != null) return actual.IndexOf(expected, stringComparison) >= 0; return false; } protected override bool Matches([Nullable(2)] string actual, CultureInfo cultureInfo) { if (actual != null) return cultureInfo.CompareInfo.IndexOf(actual, expected, caseInsensitive ? CompareOptions.IgnoreCase : CompareOptions.None) >= 0; return false; } } }