Bug: Only last filter expression is respected

README.md

@@ -101,10 +101,16 @@ Coverlet gives the ability to have fine grained control over what gets excluded
 
 Syntax: `/p:Exclude=[Assembly-Filter]Type-Filter`
 
+Wildcards
+- `*` => matches zero or more characters
+- `?` => the prefixed character is optional
+
 Examples
  - `/p:Exclude="[*]*"` => Excludes all types in all assemblies (nothing is instrumented)
  - `/p:Exclude="[coverlet.*]Coverlet.Core.Coverage"` => Excludes the Coverage class in the `Coverlet.Core` namespace belonging to any assembly that matches `coverlet.*` (e.g `coverlet.core`)
  - `/p:Exclude="[*]Coverlet.Core.Instrumentation.*"` => Excludes all types belonging to `Coverlet.Core.Instrumentation` namespace in any assembly
+ - `/p:Exclude="[coverlet.*.tests?]*"` => Excludes all types in any assembly starting with `coverlet.` and ending with `.test` or `.tests` (the `?` makes the `s`  optional)
+ - `/p:Exclude="[coverlet.*]*,[*]Coverlet.Core*"` => Excludes assemblies matching `coverlet.*` and excludes all types belonging to the `Coverlet.Core` namespace in any assembly
 
 ```bash
 dotnet test /p:CollectCoverage=true /p:Exclude="[coverlet.*]Coverlet.Core.Coverage"

src/coverlet.core/Helpers/InstrumentationHelper.cs

@@ -107,7 +107,7 @@ public static bool IsValidFilterExpression(string filter)
             if (filter.EndsWith("]"))
                 return false;
 
-            if (new Regex(@"[^\w*]").IsMatch(filter.Replace(".", "").Replace("[", "").Replace("]", "")))
+            if (new Regex(@"[^\w*]").IsMatch(filter.Replace(".", "").Replace("?", "").Replace("[", "").Replace("]", "")))
                 return false;
 
             return true;
@@ -118,30 +118,37 @@ public static bool IsModuleExcluded(string module, string[] filters)
             if (filters == null)
                 return false;
 
-            bool isMatch = false;
             module = Path.GetFileNameWithoutExtension(module);
+            if (module == null)
+                return false;
 
             foreach (var filter in filters)
             {
                 string modulePattern = filter.Substring(1, filter.IndexOf(']') - 1);
                 string typePattern = filter.Substring(filter.IndexOf(']') + 1);
 
+                if (typePattern != "*")
+                    continue;
+
                 modulePattern = WildcardToRegex(modulePattern);
 
                 var regex = new Regex(modulePattern);
-                isMatch = regex.IsMatch(module) && typePattern == "*";
+
+                if (regex.IsMatch(module))
+                    return true;
             }
 
-            return isMatch;
+            return false;
         }
 
         public static bool IsTypeExcluded(string module, string type, string[] filters)
         {
             if (filters == null)
                 return false;
 
-            bool isMatch = false;
             module = Path.GetFileNameWithoutExtension(module);
+            if (module == null)
+                return false;
 
             foreach (var filter in filters)
             {
@@ -151,10 +158,11 @@ public static bool IsTypeExcluded(string module, string type, string[] filters)
                 typePattern = WildcardToRegex(typePattern);
                 modulePattern = WildcardToRegex(modulePattern);
 
-                isMatch = new Regex(typePattern).IsMatch(type) && new Regex(modulePattern).IsMatch(module);
+                if (new Regex(typePattern).IsMatch(type) && new Regex(modulePattern).IsMatch(module))
+                    return true;
             }
 
-            return isMatch;
+            return false;
         }
 
         public static string[] GetExcludedFiles(string[] rules)
@@ -221,7 +229,7 @@ private static string WildcardToRegex(string pattern)
         {
             return "^" + Regex.Escape(pattern).
             Replace("\\*", ".*").
-            Replace("\\?", ".") + "$";
+            Replace("\\?", "?") + "$";
         }
 
         private static bool IsAssembly(string filePath)

test/coverlet.core.tests/Helpers/InstrumentationHelperTests.cs

@@ -141,6 +141,106 @@ public void TestGetExcludedFilesUsingGlobbing()
 
             Assert.Equal(paths.Length, excludedFiles.Count());
         }
+
+        [Fact]
+        public void TestIsModuleExcludedWithoutFilter()
+        {
+            var result = InstrumentationHelper.IsModuleExcluded("Module.dll", new string[0]);
+
+            Assert.False(result);
+        }
+
+        [Theory]
+        [InlineData("[Module]mismatch")]
+        [InlineData("[Mismatch]*")]
+        public void TestIsModuleExcludedWithSingleMismatchFilter(string filter)
+        {
+            var result = InstrumentationHelper.IsModuleExcluded("Module.dll", new[] { filter });
+
+            Assert.False(result);
+        }
+
+        [Theory]
+        [MemberData(nameof(ValidModuleFilterData))]
+        public void TestIsModuleExcludedWithFilter(string filter)
+        {
+            var result = InstrumentationHelper.IsModuleExcluded("Module.dll", new[] { filter });
+
+            Assert.True(result);
+        }
+
+        [Theory]
+        [MemberData(nameof(ValidModuleFilterData))]
+        public void TestIsModuleExcludedWithMatchingAndMismatchingFilter(string filter)
+        {
+            var filters = new[] { "[Mismatch]*", filter, "[Mismatch]*" };
+
+            var result = InstrumentationHelper.IsModuleExcluded("Module.dll", filters);
+
+            Assert.True(result);
+        }
+
+        [Fact]
+        public void TestIsTypeExcludedWithoutFilter()
+        {
+            var result = InstrumentationHelper.IsTypeExcluded("Module.dll", "a.b.Dto", new string[0]);
+
+            Assert.False(result);
+        }
+
+        [Theory]
+        [InlineData("[Module]mismatch")]
+        [InlineData("[Mismatch]*")]
+        [InlineData("[Mismatch]a.b.Dto")]
+        public void TestIsTypeExcludedWithSingleMismatchFilter(string filter)
+        {
+            var result = InstrumentationHelper.IsTypeExcluded("Module.dll", "a.b.Dto", new[] { filter });
+
+            Assert.False(result);
+        }
+
+        [Theory]
+        [MemberData(nameof(ValidModuleAndNamespaceFilterData))]
+        public void TestIsTypeExcludedWithFilter(string filter)
+        {
+            var result = InstrumentationHelper.IsTypeExcluded("Module.dll", "a.b.Dto", new[] { filter });
+
+            Assert.True(result);
+        }
+
+        [Theory]
+        [MemberData(nameof(ValidModuleAndNamespaceFilterData))]
+        public void TestIsTypeExcludedWithMatchingAndMismatchingFilter(string filter)
+        {
+            var filters = new[] { "[Mismatch]*", filter, "[Mismatch]*" };
+
+            var result = InstrumentationHelper.IsTypeExcluded("Module.dll", "a.b.Dto", filters);
+
+            Assert.True(result);
+        }
+
+        public static IEnumerable<object[]> ValidModuleFilterData =>
+            new List<object[]>
+                {
+                    new object[] { "[Module]*" },
+                    new object[] { "[Module*]*" },
+                    new object[] { "[Mod*ule]*" },
+                    new object[] { "[M*e]*" },
+                    new object[] { "[Mod*le*]*" },
+                    new object[] { "[Module?]*" },
+                    new object[] { "[ModuleX?]*" },
+                };
+
+        public static IEnumerable<object[]> ValidModuleAndNamespaceFilterData =>
+            new List<object[]>
+                    {
+                        new object[] { "[Module]a.b.Dto" },
+                        new object[] { "[Module]a.b.Dtos?" },
+                        new object[] { "[Module]a.*" },
+                        new object[] { "[Module]a*" },
+                        new object[] { "[Module]*b.*" },
+                    }
+                .Concat(ValidModuleFilterData);
     }
 }