Remove unused code

pkg/analyzer/lib/src/context/context_factory.dart

Index: pkg/analyzer/lib/src/context/context_factory.dart
diff --git a/pkg/analyzer/lib/src/context/context_factory.dart b/pkg/analyzer/lib/src/context/context_factory.dart
deleted file mode 100644
index b96100d38f54073797064b90e2fbcf4d608d3e3b..0000000000000000000000000000000000000000
--- a/pkg/analyzer/lib/src/context/context_factory.dart
+++ /dev/null
@@ -1,136 +0,0 @@
-// Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
-// 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.
-
-library analyzer.src.context_factory;
-
-import 'dart:convert';
-import 'dart:core' hide Resource;
-
-import 'package:analyzer/file_system/file_system.dart';
-import 'package:analyzer/src/generated/sdk.dart';
-import 'package:yaml/yaml.dart';
-import 'package:analyzer/src/generated/engine.dart';
-import 'dart:io' as io;
-
-/// (Placeholder)
-abstract class ContextFactory {
-  /// Create an analysis context for the given [source] directory or file, with
-  /// the given [defaultOptions].
-  AnalysisContext createContext(
-      io.FileSystemEntity source, AnalysisOptions defaultOptions);
-}
-
-/// Processes package maps, extracting SDK embedders and extenders, creating a
-/// consolidated [libraryMap].
-class PackageMapProcessor {
-  static const String _EMBEDDED_LIB_MAP_KEY = 'embedded_libs';
-  static const String _EMBEDDER_FILE_NAME = '_embedder.yaml';
-  static const String _SDK_EXT_NAME = '_sdkext';
-
-  /// Map of processed embedder libraries.
-  final LibraryMap embeddedLibraries = new LibraryMap();
-
-  /// Map of processed SDK extension libraries.
-  final LibraryMap extendedLibraries = new LibraryMap();
-
-  /// Combined map of processed libraries.
-  LibraryMap get libraryMap {
-    LibraryMap libraryMap = new LibraryMap();
-
-    // Add extenders first, allowing for overwrite by embedders who take precedence.
-    for (String uri in extendedLibraries.uris) {
-      libraryMap.setLibrary(uri, extendedLibraries.getLibrary(uri));
-    }
-    for (String uri in embeddedLibraries.uris) {
-      libraryMap.setLibrary(uri, embeddedLibraries.getLibrary(uri));
-    }
-    return libraryMap;
-  }
-
-  /// Create a processor for the given [packageMap].
-  PackageMapProcessor(Map<String, List<Folder>> packageMap) {
-    packageMap?.forEach(_processPackage);
-  }
-
-  /// Whether the package map contains an SDK embedder.
-  bool get hasEmbedder => embeddedLibraries.size() > 0;
-
-  /// Whether the package map contains an SDK extension.
-  bool get hasSdkExtension => extendedLibraries.size() > 0;
-
-  void _processEmbedderYaml(String embedderYaml, Folder libDir) {
-    try {
-      YamlNode map = loadYaml(embedderYaml);
-      if (map is YamlMap) {
-        YamlNode embedded_libs = map[_EMBEDDED_LIB_MAP_KEY];
-        if (embedded_libs is YamlMap) {
-          embedded_libs.forEach(
-              (k, v) => _processMapping(embeddedLibraries, k, v, libDir));
-        }
-      }
-    } catch (_) {
-      // Ignored.
-    }
-  }
-
-  void _processMapping(
-      LibraryMap libraryMap, String name, String file, Folder libDir) {
-    if (!_hasDartPrefix(name)) {
-      // SDK libraries must begin with 'dart:'.
-      return;
-    }
-    if (libraryMap.getLibrary(name) != null) {
-      // Libraries can't be redefined.
-      return;
-    }
-    String libPath = libDir.canonicalizePath(file);
-    SdkLibraryImpl library = new SdkLibraryImpl(name)..path = libPath;
-    libraryMap.setLibrary(name, library);
-  }
-
-  void _processPackage(String name, List<Folder> libDirs) {
-    for (Folder libDir in libDirs) {
-      String embedderYaml = _readEmbedderYaml(libDir);
-      if (embedderYaml != null) {
-        _processEmbedderYaml(embedderYaml, libDir);
-      }
-      String sdkExt = _readDotSdkExt(libDir);
-      if (sdkExt != null) {
-        _processSdkExt(sdkExt, libDir);
-      }
-    }
-  }
-
-  void _processSdkExt(String sdkExtJSON, Folder libDir) {
-    try {
-      var sdkExt = JSON.decode(sdkExtJSON);
-      if (sdkExt is Map) {
-        sdkExt.forEach(
-            (k, v) => _processMapping(extendedLibraries, k, v, libDir));
-      }
-    } catch (_) {
-      // Ignored.
-    }
-  }
-
-  static bool _hasDartPrefix(String uri) =>
-      uri.startsWith(DartSdk.DART_LIBRARY_PREFIX);
-
-  static String _readDotSdkExt(Folder libDir) =>
-      _safeRead(libDir.getChild(_SDK_EXT_NAME));
-
-  static String _readEmbedderYaml(Folder libDir) =>
-      _safeRead(libDir.getChild(_EMBEDDER_FILE_NAME));
-
-  static String _safeRead(Resource file) {
-    try {
-      if (file is File) {
-        return file.readAsStringSync();
-      }
-    } on FileSystemException {
-      // File can't be read.
-    }
-    return null;
-  }
-}