Revert "Move the linter core to the analyzer package"

pkg/analyzer/lib/src/lint/project.dart

-// Copyright (c) 2015, 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.
-
-import 'dart:io';
-
-import 'package:analyzer/dart/element/element.dart';
-import 'package:analyzer/src/generated/engine.dart';
-import 'package:analyzer/src/generated/resolver.dart';
-import 'package:analyzer/src/generated/source.dart';
-import 'package:analyzer/src/lint/io.dart';
-import 'package:analyzer/src/lint/pub.dart';
-import 'package:path/path.dart' as p;
-
-Pubspec _findAndParsePubspec(Directory root) {
-  if (root.existsSync()) {
-    File pubspec = root
-        .listSync(followLinks: false)
-        .firstWhere((f) => isPubspecFile(f), orElse: () => null);
-    if (pubspec != null) {
-      return new Pubspec.parse(pubspec.readAsStringSync(),
-          sourceUrl: p.toUri(pubspec.path));
-    }
-  }
-  return null;
-}
-
-/// A semantic representation of a Dart project.
-///
-/// Projects provide a semantic model of a Dart project based on the
-/// [pub package layout conventions](https://www.dartlang.org/tools/pub/package-layout.html).
-/// This model allows clients to traverse project contents in a convenient and
-/// standardized way, access global information (such as whether elements are
-/// in the "public API") and resources that have special meanings in the
-/// context of pub package layout conventions.
-class DartProject {
-  _ApiModel _apiModel;
-  String _name;
-  Pubspec _pubspec;
-
-  /// Project root.
-  final Directory root;
-
-  /// Create a Dart project for the corresponding [context] and [sources].
-  /// If a [dir] is unspecified the current working directory will be
-  /// used.
-  DartProject(AnalysisContext context, List<Source> sources, {Directory dir})
-      : root = dir ?? Directory.current {
-    _pubspec = _findAndParsePubspec(root);
-    _apiModel = new _ApiModel(context, sources, root);
-  }
-
-  /// The project's name.
-  ///
-  /// Project names correspond to the package name as specified in the project's
-  /// [pubspec]. The pubspec is found relative to the project [root].  If no
-  /// pubspec can be found, the name defaults to the project root basename.
-  String get name => _name ??= _calculateName();
-
-  /// The project's pubspec.
-  Pubspec get pubspec => _pubspec;
-
-  /// Returns `true` if the given element is part of this project's public API.
-  ///
-  /// Public API elements are defined as all elements that are in the packages's
-  /// `lib` directory, *less* those in `lib/src` (which are treated as private
-  /// *implementation files*), plus elements having been explicitly exported
-  /// via an `export` directive.
-  bool isApi(Element element) => _apiModel.contains(element);
-
-  String _calculateName() {
-    if (pubspec != null) {
-      var nameEntry = pubspec.name;
-      if (nameEntry != null) {
-        return nameEntry.value.text;
-      }
-    }
-    return p.basename(root.path);
-  }
-}
-
-/// An object that can be used to visit Dart project structure.
-abstract class ProjectVisitor<T> {
-  T visit(DartProject project) => null;
-}
-
-/// Captures the project's API as defined by pub package layout standards.
-class _ApiModel {
-  final AnalysisContext context;
-  final List<Source> sources;
-  final Directory root;
-  final Set<LibraryElement> elements = new Set();
-
-  _ApiModel(this.context, this.sources, this.root) {
-    _calculate();
-  }
-
-  /// Return `true` if this element is part of the public API for this package.
-  bool contains(Element element) {
-    while (element != null) {
-      if (!element.isPrivate && elements.contains(element)) {
-        return true;
-      }
-      element = element.enclosingElement;
-    }
-    return false;
-  }
-
-  _calculate() {
-    if (sources == null || sources.isEmpty) {
-      return;
-    }
-
-    var libDir = root.path + '/lib';
-    var libSrcDir = libDir + '/src';
-
-    for (Source source in sources) {
-      var path = source.uri.path;
-      if (path.startsWith(libDir) && !path.startsWith(libSrcDir)) {
-        var library = context.computeLibraryElement(source);
-        var namespaceBuilder = new NamespaceBuilder();
-        var exports = namespaceBuilder.createExportNamespaceForLibrary(library);
-        var public = namespaceBuilder.createPublicNamespaceForLibrary(library);
-        elements.addAll(exports.definedNames.values);
-        elements.addAll(public.definedNames.values);
-      }
-    }
-  }
-}