FEDX-1648: Added symbol kind support

lib/src/kind_generator.dart

@@ -0,0 +1,46 @@
+import 'package:analyzer/dart/element/element.dart';
+import 'package:scip_dart/src/gen/scip.pbenum.dart';
+
+SymbolInformation_Kind symbolKindFor(Element el) {
+  // These mappings are declared in the same order as their symbol parsing
+  // counterpart is declared within SymbolGenerator._getDescriptor. Ensure
+  // this order stays consistent to ensure the correct kinds are included.
+  //
+  // Note, we cannot declare this dynamically via a lookup map since the actual
+  // type of [el], is the Impl counterpart (`ClassElementImpl`). runtimeType
+  // type checking _does not_ take inheritance into account and `is` cannot
+  // be used with variables. Hence the large list of if statements.
+  if (el is ClassElement) {
+    return SymbolInformation_Kind.Class;
+  } else if (el is MixinElement) {
+    // Pending: https://github.com/sourcegraph/scip/pull/277
+    // return SymbolInformation_Kind.Mixin;
+  } else if (el is EnumElement) {
+    return SymbolInformation_Kind.Enum;
+  } else if (el is TypeAliasElement) {
+    return SymbolInformation_Kind.TypeAlias;
+  } else if (el is ExtensionElement) {
+    // Pending: https://github.com/sourcegraph/scip/pull/277
+    // return SymbolInformation_Kind.Extension;
+  } else if (el is ConstructorElement) {
+    return SymbolInformation_Kind.Constructor;
+  } else if (el is MethodElement) {
+    return SymbolInformation_Kind.Method;
+  } else if (el is FunctionElement) {
+    return SymbolInformation_Kind.Function;
+  } else if (el is TopLevelVariableElement) {
+    return SymbolInformation_Kind.Variable;
+  } else if (el is PrefixElement) {
+    return SymbolInformation_Kind.Namespace;
+  } else if (el is TypeParameterElement) {
+    return SymbolInformation_Kind.TypeParameter;
+  } else if (el is ParameterElement) {
+    return SymbolInformation_Kind.Parameter;
+  } else if (el is PropertyAccessorElement) {
+    return SymbolInformation_Kind.Property;
+  } else if (el is FieldElement) {
+    return SymbolInformation_Kind.Field;
+  }
+
+  return SymbolInformation_Kind.UnspecifiedKind;
+}

lib/src/scip_visitor.dart

@@ -5,6 +5,7 @@ import 'package:analyzer/error/error.dart';
 import 'package:analyzer/source/line_info.dart';
 import 'package:package_config/package_config.dart';
 import 'package:pubspec_parse/pubspec_parse.dart';
+import 'package:scip_dart/src/kind_generator.dart';
 import 'package:scip_dart/src/metadata.dart';
 import 'package:scip_dart/src/gen/scip.pb.dart';
 import 'package:scip_dart/src/relationship_generator.dart';
@@ -142,10 +143,10 @@ class ScipVisitor extends GeneralizingAstVisitor {
         )) {
           final meta = getSymbolMetadata(element, offset, _analysisErrors);
           globalExternalSymbols.add(SymbolInformation(
-            symbol: symbol,
-            documentation: meta.documentation,
-            signatureDocumentation: meta.signatureDocumentation,
-          ));
+              symbol: symbol,
+              documentation: meta.documentation,
+              signatureDocumentation: meta.signatureDocumentation,
+              kind: symbolKindFor(element)));
         }
       }
     }
@@ -170,6 +171,7 @@ class ScipVisitor extends GeneralizingAstVisitor {
       documentation: meta.documentation,
       relationships: relationships,
       signatureDocumentation: meta.signatureDocumentation,
+      kind: symbolKindFor(element),
     ));
 
     occurrences.add(Occurrence(