Use in razor document mapping service

Author: jjonescz

src/Compiler/Microsoft.AspNetCore.Razor.Language/src/IRazorGeneratedDocument.cs

@@ -10,5 +10,6 @@ internal interface IRazorGeneratedDocument
     string GeneratedCode { get; }
     RazorCodeGenerationOptions Options { get; }
     ImmutableArray<SourceMapping> SourceMappings { get; }
+    ImmutableArray<SourceSpan> ComponentMappings { get; }
     RazorCodeDocument? CodeDocument { get; }
 }

src/Compiler/Microsoft.AspNetCore.Razor.Language/src/RazorHtmlDocument.cs

@@ -16,6 +16,8 @@ internal abstract class RazorHtmlDocument : IRazorGeneratedDocument
 
     public abstract ImmutableArray<SourceMapping> SourceMappings { get; }
 
+    public ImmutableArray<SourceSpan> ComponentMappings => ImmutableArray<SourceSpan>.Empty;
+
     public abstract RazorCodeDocument CodeDocument { get; }
 
     public static RazorHtmlDocument Create(RazorCodeDocument codeDocument, string generatedHtml, RazorCodeGenerationOptions options, ImmutableArray<SourceMapping> sourceMappings)

src/Razor/src/Microsoft.AspNetCore.Razor.LanguageServer/RazorDocumentMappingService.cs

@@ -332,6 +332,19 @@ public bool TryMapToHostDocumentPosition(IRazorGeneratedDocument generatedDocume
             return true;
         }
 
+        foreach (var mapping in generatedDocument.ComponentMappings)
+        {
+            var generatedAbsoluteIndex = mapping.AbsoluteIndex;
+            var distanceIntoGeneratedSpan = generatedDocumentIndex - generatedAbsoluteIndex;
+            if (generatedAbsoluteIndex <= generatedDocumentIndex &&
+                distanceIntoGeneratedSpan <= mapping.Length)
+            {
+                hostDocumentIndex = 0;
+                hostDocumentPosition = new LinePosition(0, 0);
+                return true;
+            }
+        }
+
         hostDocumentPosition = default;
         hostDocumentIndex = default;
         return false;