Extract explicit configuration loading phases

validation.go

@@ -186,3 +186,49 @@ func validationValueMutations(before, after *document.Node) []Diagnostic {
 	}
 	return diagnostics
 }
+
+func checkVersion(rule *VersionRule, root *document.Node) []Diagnostic {
+	if rule == nil {
+		return nil
+	}
+	version := Version{}
+	node, present := documentAtPath(root, rule.Path)
+	if present {
+		version.Present = true
+		switch node.Kind {
+		case document.Null:
+			version.Null = true
+		case document.String:
+			version.Text = node.Text
+		default:
+			location, _ := nearestDocumentLocation(root, rule.Path)
+			primary := documentLocationPointer(location)
+			return []Diagnostic{{
+				Code: CodeVersionType, Severity: SeverityError, Path: rule.Path.clone(),
+				Message: "schema version must be a string or null", Primary: primary,
+			}}
+		}
+	}
+	state := &validationState{
+		active: true, errorCode: CodeVersionError, warningCode: CodeVersionWarning,
+		invalidPath: CodeVersionError, document: root,
+	}
+	validation := &Validation{state: state}
+	err := rule.Check(version, validation)
+	state.active = false
+	if err != nil && !hasErrors(state.diagnostics) {
+		location, _ := nearestDocumentLocation(root, rule.Path)
+		state.diagnostics = append(state.diagnostics, Diagnostic{
+			Code: CodeVersionHookFailed, Severity: SeverityError, Path: rule.Path.clone(),
+			Message: "schema-version check failed", Primary: documentLocationPointer(location),
+		})
+	}
+	return canonicalDiagnostics(state.diagnostics)
+}
+
+func documentLocationPointer(location document.Location) *Location {
+	if !locationKnown(location) {
+		return nil
+	}
+	return &Location{SourceID: location.SourceID, Line: location.Line, Column: location.Column}
+}