scope namespace and separate file generation to the xsd

use ItemMetadata instead of global configuration

Author: shuebner

XmlSchemaClassGenerator.SourceGenerator.Tests/XmlSchemaClassGenerator.SourceGenerator.Tests.csproj

@@ -26,13 +26,10 @@
   </ItemGroup>
 
   <ItemGroup>
-    <AdditionalFiles Include="Samples\simple_schema.xsd" />    
+    <AdditionalFiles Include="Samples\simple_schema.xsd"
+                     xscgen_SeparateFiles="true"
+                     xscgen_Namespace="Sample.Generated" />    
   </ItemGroup>
-  
-  <PropertyGroup>
-    <xscgen_Namespace>Sample.Generated</xscgen_Namespace>
-    <xscgen_SeparateFiles>true</xscgen_SeparateFiles>
-  </PropertyGroup>
 
   <ItemGroup>
     <Content Update="Samples\simple_schema.xsd">

XmlSchemaClassGenerator.SourceGenerator/XmlSchemaClassGenerator.SourceGenerator.props

@@ -1,6 +1,6 @@
 <Project>
   <ItemGroup>
-    <CompilerVisibleProperty Include="xscgen_Namespace" />
-    <CompilerVisibleProperty Include="xscgen_SeparateFiles" />
+    <CompilerVisibleItemMetadata Include="AdditionalFiles" MetadataName="xscgen_Namespace" />
+    <CompilerVisibleItemMetadata Include="AdditionalFiles" MetadataName="xscgen_SeparateFiles" />
   </ItemGroup>
 </Project>

XmlSchemaClassGenerator.SourceGenerator/XsdSourceGenerator.cs

@@ -116,13 +116,13 @@ public void Initialize(GeneratorInitializationContext context)
 
         static IEnumerable<(AdditionalText SchemaFile, string Namespace)> GetConfigurations(GeneratorExecutionContext context)
         {
-            if (!context.AnalyzerConfigOptions.GlobalOptions.TryGetValue("build_property.xscgen_namespace", out var @namespace))
-            {
-                @namespace = "Generated";
-            }
-
             foreach (AdditionalText file in context.AdditionalFiles)
             {
+                if (!context.AnalyzerConfigOptions.GetOptions(file).TryGetValue("build_metadata.AdditionalFiles.xscgen_Namespace", out var @namespace))
+                {
+                    @namespace = "Generated";
+                }
+
                 if (Path.GetExtension(file.Path).Equals(".xsd", StringComparison.OrdinalIgnoreCase))
                 {
                     yield return (file, @namespace);