fix: Enable the comment in model config files.

Casbin.UnitTests/Casbin.UnitTests.csproj

@@ -201,6 +201,12 @@
     <None Update="Examples\rbac_in_operator_policy.csv">
       <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
     </None>
+    <None Update="Examples\abac_comment.conf">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </None>
+    <None Update="Examples\rbac_comment.conf">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </None>
   </ItemGroup>
 
   <ItemGroup>

Casbin.UnitTests/Fixtures/TestModelFixture.cs

@@ -52,6 +52,9 @@ public class TestModelFixture
     internal readonly string _rbacMultipleEvalModelText = ReadTestFile("rbac_multiple_eval_model.conf");
     internal readonly string _rbacMultipleEvalPolicyText = ReadTestFile("rbac_multiple_eval_policy.csv");
 
+    internal readonly string _abacCommentText = ReadTestFile("abac_comment.conf");
+    internal readonly string _rbacCommentText = ReadTestFile("rbac_comment.conf");
+
     // https://github.com/casbin/Casbin.NET/issues/154
     internal readonly string _rbacMultipleModelText = ReadTestFile("rbac_multiple_rolemanager_model.conf");
     internal readonly string _rbacMultiplePolicyText = ReadTestFile("rbac_multiple_rolemanager_policy.csv");

Casbin.UnitTests/ModelTests/ModelTest.cs

@@ -1,4 +1,5 @@
 using System.Threading.Tasks;
+using Casbin.Model;
 using Casbin.UnitTests.Fixtures;
 using Casbin.UnitTests.Mock;
 using Xunit;
@@ -600,6 +601,29 @@ public void TestMultipleTypeModel()
         Assert.False(e.Enforce(context, new { Age = 70 }, "data2", "read"));
     }
 
+    [Fact]
+    public void TestAbacComment()
+    {
+        var model = TestModelFixture.GetNewTestModel(_testModelFixture._abacCommentText);
+        Assert.Equal(3, model.Sections.GetRequestAssertion("r").Tokens.Count);
+        Assert.Equal(2, model.Sections.GetRequestAssertion("r").Tokens["act"]);
+        Assert.Equal(3, model.Sections.GetPolicyAssertion("p").Tokens.Count);
+        Assert.Equal("some(where (p.eft == allow))", model.Sections.GetPolicyEffectAssertion("e").Value);
+        Assert.Equal("r.sub == p.sub && r.obj == p.obj && r.act == p.act", model.Sections.GetMatcherAssertion("m").Value);
+    }
+
+    [Fact]
+    public void TestRbacComment()
+    {
+        var model = TestModelFixture.GetNewTestModel(_testModelFixture._rbacCommentText);
+        Assert.Equal(3, model.Sections.GetRequestAssertion("r").Tokens.Count);
+        Assert.Equal(2, model.Sections.GetRequestAssertion("r").Tokens["act"]);
+        Assert.Equal(3, model.Sections.GetPolicyAssertion("p").Tokens.Count);
+        Assert.Equal("_, _", model.Sections.GetRoleAssertion("g").Value);
+        Assert.Equal("some(where (p.eft == allow))", model.Sections.GetPolicyEffectAssertion("e").Value);
+        Assert.Equal("g(r.sub, p.sub) && r.obj == p.obj && r.act == p.act", model.Sections.GetMatcherAssertion("m").Value);
+    }
+
     public class TestResource
     {
         public TestResource(string name, string owner)

Casbin.UnitTests/examples/abac_comment.conf

@@ -0,0 +1,13 @@
+[request_definition]
+r = sub, obj, act    ### The following text is a test for comment in model config.
+
+[policy_definition]
+p = sub, obj, act   #This is an inline comment, splited by a comma
+
+[policy_effect]
+#  This is a comment, splited by a comma
+e = some(where (p.eft == allow))    #This is an inline comment, splited by a comma
+
+#This is a comment, splited by a comma
+[matchers]
+m = r.sub == p.sub && r.obj == p.obj && r.act == p.act  # Comment, another comment

Casbin.UnitTests/examples/rbac_comment.conf

@@ -0,0 +1,16 @@
+[request_definition]
+r = sub, obj, act  #This is an inline comment, splited by a comma
+
+[policy_definition]
+p = sub, obj, act  #This is an inline comment, splited by a comma
+
+[role_definition]
+#  This is a comment, splited by a comma
+g = _, _  #  This is an inline comment, splited by a comma
+
+#  This is a comment, splited by a comma
+[policy_effect]
+e = some(where (p.eft == allow))   #This is an inline comment, splited by a comma
+
+[matchers]
+m = g(r.sub, p.sub) && r.obj == p.obj && r.act == p.act  #  This is an inline comment, splited by a comma

Casbin/Config/DefaultConfig.cs

@@ -215,7 +215,9 @@ private void ParseBuffer(TextReader reader)
                     }
                     string option = optionVal[0].Trim();
                     string value = optionVal[1].Trim();
-                    AddConfig(section, option, value);
+                    int commentStartIdx = value.IndexOf(PermConstants.PolicyCommentChar);
+                    var processedValue = (commentStartIdx == -1 ? value : value.Remove(commentStartIdx)).Trim();
+                    AddConfig(section, option, processedValue);
                 }
             }
         }

Casbin/PermConstants.cs

@@ -5,6 +5,7 @@ public static class PermConstants
         public const char PolicySeparatorChar = ',';
         public const string PolicySeparatorString = ", "; // include a white space
         internal const string SubjectPrioritySeparatorString = "::";
+        public const char PolicyCommentChar = '#';
 
         public const string DefaultRequestType = "r";
         public const string RequestType2 = "r2";