Replace hasPrivateName/hasPublicName with one extension getter

lib/src/model/model_element.dart

@@ -21,7 +21,7 @@ import 'package:dartdoc/src/model/comment_referable.dart';
 import 'package:dartdoc/src/model/feature_set.dart';
 import 'package:dartdoc/src/model/model.dart';
 import 'package:dartdoc/src/model/prefix.dart';
-import 'package:dartdoc/src/model_utils.dart' as utils;
+import 'package:dartdoc/src/model_utils.dart';
 import 'package:dartdoc/src/render/parameter_renderer.dart';
 import 'package:dartdoc/src/runtime_stats.dart';
 import 'package:dartdoc/src/source_linker.dart';
@@ -389,7 +389,7 @@ abstract class ModelElement extends Canonicalization
         !(enclosingElement as Extension).isPublic) {
       return false;
     }
-    return utils.hasPublicName(element) && !hasNodoc;
+    return !element.hasPrivateName && !hasNodoc;
   }();
 
   @override
@@ -458,7 +458,7 @@ abstract class ModelElement extends Canonicalization
       getModelForElement(element.library!) as Library;
 
   late final Library? canonicalLibrary = () {
-    if (!utils.hasPublicName(element)) {
+    if (element.hasPrivateName) {
       // Privately named elements can never have a canonical library.
       return null;
     }

lib/src/model/privacy.dart

@@ -2,7 +2,17 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-/// Classes implementing this have a public/private distinction.
+/// Classes implementing this have a package-public/private distinction.
 abstract interface class Privacy {
+  /// Whether this is "package-public."
+  ///
+  /// A "package-public" element satisfies the following requirements:
+  /// * is not documented with the `@nodoc` directive,
+  /// * for a library, is found in a package's top-level 'lib' directory, and
+  ///   not found in it's 'lib/src' directory,
+  /// * for a library member, is in a _public_ library's exported namespace, and
+  ///   is not privately named, nor an unnamed extension,
+  /// * for a container (class, enum, extension, extension type, mixin) member,
+  ///   is in a _public_ container, and is not privately named.
   bool get isPublic;
 }

lib/src/model_utils.dart

@@ -62,38 +62,43 @@ Iterable<InheritingContainer> findCanonicalFor(
       c);
 }
 
-bool hasPrivateName(Element e) {
-  var elementName = e.name;
-  if (elementName == null) return false;
+extension ElementExtension on Element {
+  bool get hasPrivateName {
+    final name = this.name;
+    if (name == null) return false;
 
-  if (elementName.startsWith('_')) {
-    return true;
-  }
-  // GenericFunctionTypeElements have the name we care about in the enclosing
-  // element.
-  if (e is GenericFunctionTypeElement) {
-    var enclosingElementName = e.enclosingElement?.name;
-    if (enclosingElementName != null && enclosingElementName.startsWith('_')) {
+    if (name.startsWith('_')) {
       return true;
     }
-  }
-  if (e is LibraryElement) {
-    if (e.identifier.startsWith('dart:_') ||
-        e.identifier.startsWith('dart:nativewrappers/') ||
-        'dart:nativewrappers' == e.identifier) {
-      return true;
+
+    var self = this;
+
+    // GenericFunctionTypeElements have the name we care about in the enclosing
+    // element.
+    if (self is GenericFunctionTypeElement) {
+      var enclosingElementName = self.enclosingElement?.name;
+      if (enclosingElementName != null &&
+          enclosingElementName.startsWith('_')) {
+        return true;
+      }
     }
-    var elementUri = e.source.uri;
-    // TODO(jcollins-g): Implement real cross package detection
-    if (elementUri.scheme == 'package' && elementUri.pathSegments[1] == 'src') {
-      return true;
+    if (self is LibraryElement) {
+      if (self.identifier.startsWith('dart:_') ||
+          self.identifier.startsWith('dart:nativewrappers/') ||
+          'dart:nativewrappers' == self.identifier) {
+        return true;
+      }
+      var elementUri = self.source.uri;
+      // TODO(jcollins-g): Implement real cross package detection.
+      if (elementUri.scheme == 'package' &&
+          elementUri.pathSegments[1] == 'src') {
+        return true;
+      }
     }
+    return false;
   }
-  return false;
 }
 
-bool hasPublicName(Element e) => !hasPrivateName(e);
-
 extension IterableOfDocumentableExtension<E extends Documentable>
     on Iterable<E> {
   /// The public items which are documented.