Override packagemeta using a provider rather than statically

bin/dartdoc.dart

@@ -12,17 +12,11 @@ import 'package:dartdoc/options.dart';
 /// Analyzes Dart files and generates a representation of included libraries,
 /// classes, and members. Uses the current directory to look for libraries.
 Future<void> main(List<String> arguments) async {
-  var config = await parseOptions(arguments);
+  var config = await parseOptions(pubPackageMetaProvider, arguments);
   if (config == null) {
     // There was an error while parsing options.
     return;
   }
-  // Set the default way to construct [PackageMeta].
-  PackageMeta.setPackageMetaFactories(
-    PubPackageMeta.fromElement,
-    PubPackageMeta.fromFilename,
-    PubPackageMeta.fromDir,
-  );
   final packageBuilder = PubPackageBuilder(config);
   final dartdoc = config.generateDocs
       ? await Dartdoc.fromContext(config, packageBuilder)

lib/options.dart

@@ -28,9 +28,12 @@ Future<List<DartdocOption>> createDartdocProgramOptions() async {
   ];
 }
 
-Future<DartdocProgramOptionContext> parseOptions(List<String> arguments) async {
+Future<DartdocProgramOptionContext> parseOptions(
+  PackageMetaProvider packageMetaProvider,
+  List<String> arguments,
+) async {
   var optionSet = await DartdocOptionSet.fromOptionGenerators('dartdoc', [
-    createDartdocOptions,
+    () => createDartdocOptions(packageMetaProvider),
     createDartdocProgramOptions,
     createLoggingOptions,
     createGeneratorOptions,

lib/src/dartdoc_options.dart

@@ -1429,7 +1429,9 @@ class DartdocOptionContext extends DartdocOptionContextBase
 
 /// Instantiate dartdoc's configuration file and options parser with the
 /// given command line arguments.
-Future<List<DartdocOption>> createDartdocOptions() async {
+Future<List<DartdocOption>> createDartdocOptions(
+  PackageMetaProvider packageMetaProvider,
+) async {
   return <DartdocOption>[
     DartdocOptionArgOnly<bool>('allowTools', false,
         help: 'Execute user-defined tools to fill in @tool directives.',
@@ -1562,7 +1564,7 @@ Future<List<DartdocOption>> createDartdocOptions() async {
     DartdocOptionSyntheticOnly<PackageMeta>(
       'packageMeta',
       (DartdocSyntheticOption<PackageMeta> option, Directory dir) {
-        var packageMeta = PackageMeta.fromDir(dir);
+        var packageMeta = packageMetaProvider.fromDir(dir);
         if (packageMeta == null) {
           throw DartdocOptionError(
               'Unable to determine package for directory: ${dir.path}');
@@ -1590,8 +1592,8 @@ Future<List<DartdocOption>> createDartdocOptions() async {
         help: "Label categories that aren't documented", negatable: true),
     DartdocOptionSyntheticOnly<PackageMeta>('topLevelPackageMeta',
         (DartdocSyntheticOption<PackageMeta> option, Directory dir) {
-      var packageMeta = PackageMeta.fromDir(
-          Directory(option.parent['inputDir'].valueAt(dir)));
+      var packageMeta = packageMetaProvider
+          .fromDir(Directory(option.parent['inputDir'].valueAt(dir)));
       if (packageMeta == null) {
         throw DartdocOptionError(
             'Unable to generate documentation: no package found');
@@ -1632,7 +1634,7 @@ Future<List<DartdocOption>> createDartdocOptions() async {
     // TODO(jcollins-g): refactor so there is a single static "create" for
     // each DartdocOptionContext that traverses the inheritance tree itself.
     ...await createExperimentOptions(),
-    ...await createPackageWarningOptions(),
+    ...await createPackageWarningOptions(packageMetaProvider),
     ...await createSourceLinkerOptions(),
   ];
 }

lib/src/model/library.dart

@@ -426,7 +426,10 @@ class Library extends ModelElement with Categorization, TopLevelContainer {
   PackageMeta _packageMeta;
 
   PackageMeta get packageMeta {
-    _packageMeta ??= PackageMeta.fromElement(element, config.sdkDir);
+    _packageMeta ??= packageGraph.packageMetaProvider.fromElement(
+      element,
+      config.sdkDir,
+    );
     return _packageMeta;
   }
 

lib/src/model/package_builder.dart

@@ -26,7 +26,8 @@ import 'package:dartdoc/src/dartdoc_options.dart';
 import 'package:dartdoc/src/io_utils.dart';
 import 'package:dartdoc/src/logging.dart';
 import 'package:dartdoc/src/model/model.dart';
-import 'package:dartdoc/src/package_meta.dart' show PackageMeta;
+import 'package:dartdoc/src/package_meta.dart'
+    show PackageMeta, pubPackageMetaProvider;
 import 'package:dartdoc/src/render/renderer_factory.dart';
 import 'package:dartdoc/src/special_elements.dart';
 import 'package:package_config/discovery.dart' as package_config;
@@ -62,7 +63,12 @@ class PubPackageBuilder implements PackageBuilder {
     var rendererFactory = RendererFactory.forFormat(config.format);
 
     var newGraph = PackageGraph.UninitializedPackageGraph(
-        config, sdk, hasEmbedderSdkFiles, rendererFactory);
+      config,
+      sdk,
+      hasEmbedderSdkFiles,
+      rendererFactory,
+      pubPackageMetaProvider,
+    );
     await getLibraries(newGraph);
     await newGraph.initializePackageGraph();
     return newGraph;
@@ -238,7 +244,7 @@ class PubPackageBuilder implements PackageBuilder {
   Set<PackageMeta> _packageMetasForFiles(Iterable<String> files) {
     var metas = <PackageMeta>{};
     for (var filename in files) {
-      metas.add(PackageMeta.fromFilename(filename));
+      metas.add(pubPackageMetaProvider.fromFilename(filename));
     }
     return metas;
   }

lib/src/model/package_graph.dart

@@ -14,16 +14,21 @@ import 'package:dartdoc/src/dartdoc_options.dart';
 import 'package:dartdoc/src/logging.dart';
 import 'package:dartdoc/src/model/model.dart';
 import 'package:dartdoc/src/model_utils.dart' as utils;
-import 'package:dartdoc/src/package_meta.dart' show PackageMeta;
+import 'package:dartdoc/src/package_meta.dart'
+    show PackageMeta, PackageMetaProvider;
 import 'package:dartdoc/src/render/renderer_factory.dart';
 import 'package:dartdoc/src/special_elements.dart';
 import 'package:dartdoc/src/tuple.dart';
 import 'package:dartdoc/src/warnings.dart';
 
 class PackageGraph {
   PackageGraph.UninitializedPackageGraph(
-      this.config, this.sdk, this.hasEmbedderSdk, this.rendererFactory)
-      : packageMeta = config.topLevelPackageMeta {
+    this.config,
+    this.sdk,
+    this.hasEmbedderSdk,
+    this.rendererFactory,
+    this.packageMetaProvider,
+  ) : packageMeta = config.topLevelPackageMeta {
     _packageWarningCounter = PackageWarningCounter(this);
     // Make sure the default package exists, even if it has no libraries.
     // This can happen for packages that only contain embedder SDKs.
@@ -38,7 +43,7 @@ class PackageGraph {
   void addLibraryToGraph(DartDocResolvedLibrary resolvedLibrary) {
     assert(!allLibrariesAdded);
     var element = resolvedLibrary.element;
-    var packageMeta = PackageMeta.fromElement(element, config.sdkDir);
+    var packageMeta = packageMetaProvider.fromElement(element, config.sdkDir);
     var lib = Library.fromLibraryResult(
         resolvedLibrary, this, Package.fromPackageMeta(packageMeta, this));
     packageMap[packageMeta.name].libraries.add(lib);
@@ -214,6 +219,9 @@ class PackageGraph {
   /// Factory for renderers
   final RendererFactory rendererFactory;
 
+  /// PackageMeta Provider for building [PackageMeta]s.
+  final PackageMetaProvider packageMetaProvider;
+
   Package _defaultPackage;
 
   Package get defaultPackage {
@@ -849,7 +857,7 @@ class PackageGraph {
         resolvedLibrary,
         this,
         Package.fromPackageMeta(
-            PackageMeta.fromElement(elementLibrary, config.sdkDir),
+            packageMetaProvider.fromElement(elementLibrary, config.sdkDir),
             packageGraph));
     allLibraries[elementLibrary] = foundLibrary;
     return foundLibrary;

lib/src/package_meta.dart

@@ -35,6 +35,28 @@ final List<List<String>> __sdkDirFilePathsPosix = [
   ['lib/core/core.dart'],
 ];
 
+final PackageMetaProvider pubPackageMetaProvider = PackageMetaProvider(
+  PubPackageMeta.fromElement,
+  PubPackageMeta.fromFilename,
+  PubPackageMeta.fromDir,
+);
+
+/// Sets the supported way of constructing [PackageMeta] objects.
+///
+/// These objects can be constructed from a filename, a directory
+/// or a [LibraryElement]. We allow different dartdoc implementations to
+/// provide their own [PackageMeta] types.
+///
+/// By using a different provider, these implementations can control how
+/// [PackageMeta] objects is built.
+class PackageMetaProvider {
+  final PackageMeta Function(LibraryElement, String) fromElement;
+  final PackageMeta Function(String) fromFilename;
+  final PackageMeta Function(Directory) fromDir;
+
+  PackageMetaProvider(this.fromElement, this.fromFilename, this.fromDir);
+}
+
 /// Describes a single package in the context of `dartdoc`.
 ///
 /// The primary function of this class is to allow canonicalization of packages
@@ -104,46 +126,6 @@ abstract class PackageMeta {
 
   @override
   String toString() => name;
-
-  /// Sets the supported ways of constructing [PackageMeta] objects.
-  ///
-  /// These objects can be constructed from a filename, a directory
-  /// or a [LibraryElement]. We allow different dartdoc implementations to
-  /// provide their own [PackageMeta] types.
-  ///
-  /// By calling this function, these implementations can control how
-  /// [PackageMeta] is built.
-  static void setPackageMetaFactories(
-    PackageMeta Function(LibraryElement, String) fromElementFactory,
-    PackageMeta Function(String) fromFilenameFactory,
-    PackageMeta Function(Directory) fromDirFactory,
-  ) {
-    assert(fromElementFactory != null);
-    assert(fromFilenameFactory != null);
-    assert(fromDirFactory != null);
-    if (_fromElement == fromElementFactory &&
-        _fromFilename == fromFilenameFactory &&
-        _fromDir == fromDirFactory) {
-      // Nothing to do.
-      return;
-    }
-    if (_fromElement != null || _fromFilename != null || _fromDir != null) {
-      throw StateError('PackageMeta factories cannot be changed once defined.');
-    }
-    _fromElement = fromElementFactory;
-    _fromFilename = fromFilenameFactory;
-    _fromDir = fromDirFactory;
-  }
-
-  static PackageMeta Function(LibraryElement, String) _fromElement;
-  static PackageMeta Function(String) _fromFilename;
-  static PackageMeta Function(Directory) _fromDir;
-  static PackageMeta Function(LibraryElement, String) get fromElement =>
-      _fromElement ?? PubPackageMeta.fromElement;
-  static PackageMeta Function(String) get fromFilename =>
-      _fromFilename ?? PubPackageMeta.fromFilename;
-  static PackageMeta Function(Directory) get fromDir =>
-      _fromDir ?? PubPackageMeta.fromDir;
 }
 
 /// Default implementation of [PackageMeta] depends on pub packages.

lib/src/warnings.dart

@@ -23,7 +23,9 @@ abstract class PackageWarningOptionContext implements DartdocOptionContextBase {
   bool get verboseWarnings => optionSet['verboseWarnings'].valueAt(context);
 }
 
-Future<List<DartdocOption>> createPackageWarningOptions() async {
+Future<List<DartdocOption>> createPackageWarningOptions(
+  PackageMetaProvider packageMetaProvider,
+) async {
   return <DartdocOption>[
     DartdocOptionArgOnly<bool>('allowNonLocalWarnings', false,
         negatable: true,
@@ -79,7 +81,10 @@ Future<List<DartdocOption>> createPackageWarningOptions() async {
                     .join('\n')),
     // Synthetic option uses a factory to build a PackageWarningOptions from all the above flags.
     DartdocOptionSyntheticOnly<PackageWarningOptions>(
-        'packageWarningOptions', PackageWarningOptions.fromOptions),
+      'packageWarningOptions',
+      (DartdocSyntheticOption<PackageWarningOptions> option, Directory dir) =>
+          PackageWarningOptions.fromOptions(option, dir, packageMetaProvider),
+    ),
   ];
 }
 
@@ -303,10 +308,13 @@ class PackageWarningOptions {
 
   /// [packageMeta] parameter is for testing.
   static PackageWarningOptions fromOptions(
-      DartdocSyntheticOption<PackageWarningOptions> option, Directory dir) {
+    DartdocSyntheticOption<PackageWarningOptions> option,
+    Directory dir,
+    PackageMetaProvider packageMetaProvider,
+  ) {
     // First, initialize defaults.
     var newOptions = PackageWarningOptions();
-    var packageMeta = PackageMeta.fromDir(dir);
+    var packageMeta = packageMetaProvider.fromDir(dir);
 
     // Interpret errors/warnings/ignore options.  In the event of conflict, warning overrides error and
     // ignore overrides warning.

test/dartdoc_integration_test.dart

@@ -164,7 +164,7 @@ void main() {
       await subprocessLauncher.runStreamed(Platform.resolvedExecutable, args,
           workingDirectory: _testPackagePath,
           perLine: (s) => output.writeln(s));
-      var dartdocMeta = PackageMeta.fromFilename(dartdocPath);
+      var dartdocMeta = pubPackageMetaProvider.fromFilename(dartdocPath);
       expect(output.toString(),
           endsWith('dartdoc version: ${dartdocMeta.version}\n'));
     });

test/package_meta_test.dart

@@ -16,7 +16,7 @@ void main() {
 
     setUp(() {
       var d = Directory.systemTemp.createTempSync('test_package_not_valid');
-      p = PackageMeta.fromDir(d);
+      p = pubPackageMetaProvider.fromDir(d);
     });
 
     test('is not valid', () {
@@ -25,7 +25,7 @@ void main() {
   });
 
   group('PackageMeta for the test package', () {
-    var p = PackageMeta.fromDir(Directory(
+    var p = pubPackageMetaProvider.fromDir(Directory(
         path.join(Directory.current.path, 'testing', 'test_package')));
 
     test('readme with corrupt UTF-8 loads without throwing', () {
@@ -35,7 +35,7 @@ void main() {
   });
 
   group('PackageMeta.fromDir for this package', () {
-    var p = PackageMeta.fromDir(Directory.current);
+    var p = pubPackageMetaProvider.fromDir(Directory.current);
 
     test('has a name', () {
       expect(p.name, 'dartdoc');
@@ -82,7 +82,7 @@ void main() {
   });
 
   group('PackageMeta.fromSdk', () {
-    var p = PackageMeta.fromDir(defaultSdkDir);
+    var p = pubPackageMetaProvider.fromDir(defaultSdkDir);
 
     test('has a name', () {
       expect(p.name, 'Dart');

test/src/utils.dart

@@ -24,7 +24,7 @@ final RegExp observatoryPortRegexp =
     RegExp(r'^Observatory listening on http://.*:(\d+)');
 
 Directory sdkDir = defaultSdkDir;
-PackageMeta sdkPackageMeta = PackageMeta.fromDir(sdkDir);
+PackageMeta sdkPackageMeta = pubPackageMetaProvider.fromDir(sdkDir);
 
 final _testPackageGraphMemo = AsyncMemoizer<PackageGraph>();
 Future<PackageGraph> get testPackageGraph => _testPackageGraphMemo.runOnce(() =>
@@ -98,17 +98,20 @@ final Directory testPackageCustomTemplates =
 /// the '--input' flag.
 Future<DartdocGeneratorOptionContext> generatorContextFromArgv(
     List<String> argv) async {
-  var optionSet = await DartdocOptionSet.fromOptionGenerators(
-      'dartdoc', [createDartdocOptions, createGeneratorOptions]);
+  var optionSet = await DartdocOptionSet.fromOptionGenerators('dartdoc', [
+    () => createDartdocOptions(pubPackageMetaProvider),
+    createGeneratorOptions,
+  ]);
   optionSet.parseArguments(argv);
   return DartdocGeneratorOptionContext(optionSet, null);
 }
 
 /// Convenience factory to build a [DartdocOptionContext] and associate it with a
 /// [DartdocOptionSet] based on the current working directory.
 Future<DartdocOptionContext> contextFromArgv(List<String> argv) async {
-  var optionSet = await DartdocOptionSet.fromOptionGenerators(
-      'dartdoc', [createDartdocOptions]);
+  var optionSet = await DartdocOptionSet.fromOptionGenerators('dartdoc', [
+    () => createDartdocOptions(pubPackageMetaProvider),
+  ]);
   optionSet.parseArguments(argv);
   return DartdocOptionContext(optionSet, Directory.current);
 }

test/warnings_test.dart

@@ -8,6 +8,7 @@ library dartdoc.warnings_test;
 import 'dart:io';
 
 import 'package:dartdoc/src/dartdoc_options.dart';
+import 'package:dartdoc/src/package_meta.dart';
 import 'package:dartdoc/src/warnings.dart';
 import 'package:path/path.dart' as path;
 import 'package:test/test.dart';
@@ -47,7 +48,7 @@ dartdoc:
 
   setUp(() async {
     optionSet = await DartdocOptionSet.fromOptionGenerators(
-        'dartdoc', [createDartdocOptions]);
+        'dartdoc', [() => createDartdocOptions(pubPackageMetaProvider)]);
   });
 
   test('Verify that options for enabling/disabling packages work', () {