Add selected profile overlays

load_metadata.go

@@ -34,6 +34,43 @@ func metadataFromDecoded(decoded decodedConfiguration) Metadata {
 	return metadata
 }
 
+func applyOverlayMetadata(metadata *Metadata, records []overlayRecord) {
+	for _, record := range records {
+		for _, displaced := range record.displaced {
+			pointer := displaced.path.String()
+			history := metadata.history[pointer]
+			profileIndex := -1
+			for index := len(history) - 1; index >= 0; index-- {
+				if history[index].Origin.Layer == LayerProfile {
+					profileIndex = index
+					break
+				}
+			}
+			baseChange := Change{Path: displaced.path.clone(), Origin: cloneOrigin(displaced.origin)}
+			if len(history) != 0 && history[len(history)-1].Origin.Layer == LayerDefault {
+				baseChange.Previous = []Origin{cloneOrigin(history[len(history)-1].Origin)}
+			}
+			if profileIndex >= 0 {
+				history = append(history[:profileIndex], append([]Change{baseChange}, history[profileIndex:]...)...)
+			} else {
+				history = append(history, baseChange)
+			}
+
+			change := cloneChange(record.change)
+			change.Previous = []Origin{cloneOrigin(displaced.origin)}
+			if profileIndex >= 0 {
+				// The effective-input projection created a leaf-shaped profile
+				// record. Replace it with the actual parent operation.
+				profileIndex++
+				history[profileIndex] = change
+			} else {
+				history = append(history, change)
+			}
+			metadata.history[pointer] = history
+		}
+	}
+}
+
 func collectFieldInfo(node *document.Node, path Path, decoded decodedConfiguration, fields map[string]FieldInfo) {
 	pointer := path.String()
 	_, explicit := decoded.presence[pointer]