Share declaring import assembly

internal/engine/import_scope.go

@@ -285,3 +285,58 @@ func importedVersionClaim(documents []*document.Node, scope acquisitionScope, co
 	}
 	return nil
 }
+
+// The declaring payload contributes once even when there are no admitted imports.
+func chargeDeclaringImport(parsed parsedSource, accounting *importAccounting, limits importLimits) *Diagnostic {
+	accounting.sources++
+	accounting.bytes += parsed.bytes
+	accounting.nodes += countInputNodes(parsed.document)
+	if accounting.sources > limits.sources {
+		value := importDiagnostic(CodeImportLimitExceeded, "configuration exceeds the source-count limit", nil)
+		return &value
+	}
+	if accounting.bytes > limits.bytes {
+		value := importDiagnostic(CodeImportLimitExceeded, "configuration exceeds the aggregate byte limit", nil)
+		return &value
+	}
+	if accounting.nodes > limits.nodes {
+		value := importDiagnostic(CodeImportLimitExceeded, "configuration exceeds the aggregate node limit", nil)
+		return &value
+	}
+	return nil
+}
+
+func prepareDeclaringImportScope(root acquiredContribution, accounting *importAccounting, limits importLimits) (acquisitionScope, *Diagnostic) {
+	scope := acquisitionScope{owner: root.identity}
+	if root.source.placementMode == PlacementModeSequenceItem {
+		root.document = root.payload
+	} else {
+		destination := root.source.Destination
+		_, placed, err := placeDocument(root.payload, destination, root.payload.Location, maxDocumentDepth, maxDocumentNodes)
+		if err != nil {
+			diagnostic := sourceDiagnostic(CodeSourceLimitExceeded, root.source.ID, "configuration exceeds the source depth or node limit after destination placement")
+			return acquisitionScope{}, &diagnostic
+		}
+		placementNodes := destinationWrapperNodeCount(destination)
+		if accounting.nodes+placementNodes > limits.nodes {
+			diagnostic := importDiagnostic(CodeImportLimitExceeded, "configuration exceeds the aggregate node limit", nil)
+			return acquisitionScope{}, &diagnostic
+		}
+		accounting.nodes += placementNodes
+		root.document, root.destination = placed, destination.clone()
+		scope.destination = destination.clone()
+	}
+	scope.contributions = []acquiredContribution{root}
+	return scope, nil
+}
+
+func finalizeDeclaringImportScope(scope acquisitionScope, root acquiredContribution, accounting *importAccounting, limits importLimits) (acquisitionScope, *Diagnostic) {
+	if root.source.placementMode == PlacementModeSequenceItem {
+		root.destination = root.source.Destination.clone()
+		localScope := scope
+		root.pendingItem = &localScope
+		scope = acquisitionScope{owner: root.identity, destination: root.destination.clone(), contributions: []acquiredContribution{root}}
+	}
+	diagnostic := reservePendingItemPlacements(&scope, limits, accounting)
+	return scope, diagnostic
+}