SSZ-QL: populate variable-length metadata in AnalyzeObject (#15676)

* increased AnalyzeObject functionality to return a fully populated SSZInfo object including runtime lengths for lists

* reverted formatting change

---------

Co-authored-by: Radosław Kapka <rkapka@wp.pl>

changelog/fernantho_populate-variable-length-analyze-object.md

@@ -0,0 +1,3 @@
+### Added
+
+- Populate sszInfo of variable-length fields in AnalyzeObjects

encoding/ssz/query/analyzer.go

@@ -18,6 +18,12 @@ func AnalyzeObject(obj any) (*sszInfo, error) {
 		return nil, fmt.Errorf("could not analyze type %s: %w", value.Type().Name(), err)
 	}
 
+	// Populate variable-length information using the actual value.
+	err = PopulateVariableLengthInfo(info, value.Interface())
+	if err != nil {
+		return nil, fmt.Errorf("could not populate variable length info: %w", err)
+	}
+
 	return info, nil
 }
 

encoding/ssz/query/query_test.go

@@ -171,11 +171,9 @@ func TestCalculateOffsetAndLength(t *testing.T) {
 				path, err := query.ParsePath(tt.path)
 				require.NoError(t, err)
 
-				info, err := query.AnalyzeObject(&sszquerypb.VariableTestContainer{})
-				require.NoError(t, err)
-
 				testContainer := createVariableTestContainer()
-				err = query.PopulateVariableLengthInfo(info, testContainer)
+
+				info, err := query.AnalyzeObject(testContainer)
 				require.NoError(t, err)
 
 				_, offset, length, err := query.CalculateOffsetAndLength(info, path)