Activate sibling inheritance in configuration loading

internal/engine/inheritance_load.go

@@ -0,0 +1,53 @@
+package engine
+
+import "gitea.maximumdirect.net/eric/ConfigKit/internal/document"
+
+func containsInheritanceDirective(root *document.Node) bool {
+	found := false
+	walkDocument(root, Path{}, func(path Path, _ *document.Node) {
+		if len(path.segments) != 0 && path.segments[len(path.segments)-1].kind == pathSegmentKey &&
+			path.segments[len(path.segments)-1].key == inheritanceKey {
+			found = true
+		}
+	})
+	return found
+}
+
+func inheritanceVersionDiagnostic(rule *VersionRule, expanded *inheritanceScope) *Diagnostic {
+	if rule == nil || expanded == nil {
+		return nil
+	}
+	for _, operation := range expanded.operations {
+		var location Location
+		var affected bool
+		if operation.control != nil {
+			affected = pathsIntersect(operation.control.path, rule.Path)
+			if len(operation.control.locations) != 0 {
+				location = operation.control.locations[0]
+			}
+		} else if operation.transfer != nil {
+			if relative, within := relativeHistoryPath(operation.transfer.to, rule.Path); within {
+				_, affected = documentAtPath(operation.parent, relative)
+			} else if pathContains(rule.Path, operation.transfer.to) {
+				affected = true
+			}
+			if len(operation.transfer.locations) != 0 {
+				location = operation.transfer.locations[0]
+			}
+		}
+		if affected {
+			return &Diagnostic{
+				Code: CodeInheritanceVersion, Severity: SeverityError, Path: rule.Path.clone(),
+				Message: "inheritance cannot change the schema-version path", Primary: &location,
+			}
+		}
+	}
+	return nil
+}
+
+func inheritanceOperations(expanded *inheritanceScope) []inheritanceOperation {
+	if expanded == nil {
+		return nil
+	}
+	return expanded.operations
+}