Parse and use RootNamespace from project files

Author: tamasvajk

csharp/extractor/Semmle.Extraction.CSharp.DependencyFetching/SourceGenerators/DotnetSourceGeneratorWrapper/Resx.cs

@@ -2,12 +2,12 @@
 using System.Collections.Generic;
 using System.IO;
 using System.Linq;
-using System.Text;
+using System.Text.RegularExpressions;
 using Semmle.Util.Logging;
 
 namespace Semmle.Extraction.CSharp.DependencyFetching
 {
-    internal sealed class Resx : DotnetSourceGeneratorWrapper
+    internal sealed partial class Resx : DotnetSourceGeneratorWrapper
     {
         protected override string FileType => "Resx";
 
@@ -28,6 +28,24 @@ protected override void GenerateAnalyzerConfig(IEnumerable<string> resources, st
             sw.WriteLine("is_global = true");
 
             var rootNamespace = Path.GetFileNameWithoutExtension(csprojFile);
+
+            var matches = File.ReadAllLines(csprojFile)
+                .Select(line => RootNamespace().Match(line))
+                .Where(match => match.Success)
+                .Select(match => match.Groups[1].Value)
+                .ToArray();
+
+            if (matches.Length == 1)
+            {
+                logger.LogDebug($"RootNamespace found in {csprojFile}: {matches[0]}");
+                rootNamespace = matches[0];
+            }
+            else if (matches.Length > 1)
+            {
+                logger.LogDebug($"Multiple RootNamespace elements found in {csprojFile}. Using the first one.");
+                rootNamespace = matches[0];
+            }
+
             sw.WriteLine($"build_property.RootNamespace = {rootNamespace}");
 
             foreach (var f in resources.Select(f => f.Replace('\\', '/')))
@@ -36,5 +54,8 @@ protected override void GenerateAnalyzerConfig(IEnumerable<string> resources, st
                 sw.WriteLine($"build_metadata.AdditionalFiles.EmitFormatMethods = true");
             }
         }
+
+        [GeneratedRegex(@"<RootNamespace>(.*)</RootNamespace>", RegexOptions.Compiled | RegexOptions.Singleline)]
+        private static partial Regex RootNamespace();
     }
 }

csharp/ql/integration-tests/all-platforms/standalone_resx/Members.expected

@@ -1,8 +1,8 @@
 | Program | Program.<Main>$ |
 | Program | Program.Program |
-| resx.test | resx.test.Culture |
-| resx.test | resx.test.GetResourceString |
-| resx.test | resx.test.Key123 |
-| resx.test | resx.test.Key456 |
-| resx.test | resx.test.ResourceManager |
-| resx.test | resx.test.s_resourceManager |
+| Resx.Test1.Test2.test | Resx.Test1.Test2.test.Culture |
+| Resx.Test1.Test2.test | Resx.Test1.Test2.test.GetResourceString |
+| Resx.Test1.Test2.test | Resx.Test1.Test2.test.Key123 |
+| Resx.Test1.Test2.test | Resx.Test1.Test2.test.Key456 |
+| Resx.Test1.Test2.test | Resx.Test1.Test2.test.ResourceManager |
+| Resx.Test1.Test2.test | Resx.Test1.Test2.test.s_resourceManager |

csharp/ql/integration-tests/all-platforms/standalone_resx/resx.csproj

@@ -5,6 +5,7 @@
     <TargetFramework>net8.0</TargetFramework>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>
+    <RootNamespace>Resx.Test1.Test2</RootNamespace>
   </PropertyGroup>
 
  <Target Name="DeleteBinObjFolders" BeforeTargets="Clean">