Revert "Move the linter core to the analyzer package"

pkg/analyzer/lib/src/lint/util.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/analyzer.dart';
-import 'package:analyzer/dart/ast/token.dart';
-import 'package:analyzer/src/dart/ast/token.dart';
-import 'package:analyzer/src/dart/scanner/reader.dart';
-import 'package:analyzer/src/dart/scanner/scanner.dart';
-import 'package:analyzer/src/generated/parser.dart' show Parser;
-import 'package:analyzer/src/string_source.dart' show StringSource;
-import 'package:path/path.dart' as p;
-
-final _identifier = new RegExp(r'^([(_|$)a-zA-Z]+([_a-zA-Z0-9])*)$');
-
-final _lowerCamelCase =
-    new RegExp(r'^(_)*[?$a-z][a-z0-9?$]*([A-Z][a-z0-9?$]*)*$');
-
-final _lowerCaseUnderScore = new RegExp(r'^([a-z]+([_]?[a-z0-9]+)*)+$');
-
-final _lowerCaseUnderScoreWithDots =
-    new RegExp(r'^[a-z][_a-z0-9]*(\.[a-z][_a-z0-9]*)*$');
-
-final _pubspec = new RegExp(r'^[_]?pubspec\.yaml$');
-
-final _underscores = new RegExp(r'^[_]+$');
-
-/// Create a library name prefix based on [libraryPath], [projectRoot] and
-/// current [packageName].
-String createLibraryNamePrefix(
-    {String libraryPath, String projectRoot, String packageName}) {
-  // Use the posix context to canonicalize separators (`\`).
-  var libraryDirectory = p.posix.dirname(libraryPath);
-  var path = p.posix.relative(libraryDirectory, from: projectRoot);
-  // Drop 'lib/'.
-  var segments = p.split(path);
-  if (segments[0] == 'lib') {
-    path = p.posix.joinAll(segments.sublist(1));
-  }
-  // Replace separators.
-  path = path.replaceAll('/', '.');
-  // Add separator if needed.
-  if (path.isNotEmpty) {
-    path = '.$path';
-  }
-
-  return '$packageName$path';
-}
-
-/// Returns `true` if this [fileName] is a Dart file.
-bool isDartFileName(String fileName) => fileName.endsWith('.dart');
-
-/// Returns `true` if this [name] is a legal Dart identifier.
-bool isIdentifier(String name) => _identifier.hasMatch(name);
-
-/// Returns `true` of the given [name] is composed only of `_`s.
-bool isJustUnderscores(String name) => _underscores.hasMatch(name);
-
-/// Returns `true` if this [id] is `lowerCamelCase`.
-bool isLowerCamelCase(String id) =>
-    id.length == 1 && isUpperCase(id.codeUnitAt(0)) ||
-    id == '_' ||
-    _lowerCamelCase.hasMatch(id);
-
-/// Returns `true` if this [id] is `lower_camel_case_with_underscores`.
-bool isLowerCaseUnderScore(String id) => _lowerCaseUnderScore.hasMatch(id);
-
-/// Returns `true` if this [id] is `lower_camel_case_with_underscores_or.dots`.
-bool isLowerCaseUnderScoreWithDots(String id) =>
-    _lowerCaseUnderScoreWithDots.hasMatch(id);
-
-/// Returns `true` if this [fileName] is a Pubspec file.
-bool isPubspecFileName(String fileName) => _pubspec.hasMatch(fileName);
-
-/// Returns `true` if the given code unit [c] is upper case.
-bool isUpperCase(int c) => c >= 0x40 && c <= 0x5A;
-
-class Spelunker {
-  final String path;
-  final IOSink sink;
-  Spelunker(this.path, {IOSink sink}) : this.sink = sink ?? stdout;
-
-  void spelunk() {
-    var contents = new File(path).readAsStringSync();
-
-    var errorListener = new _ErrorListener();
-
-    var reader = new CharSequenceReader(contents);
-    var stringSource = new StringSource(contents, path);
-    var scanner = new Scanner(stringSource, reader, errorListener);
-    var startToken = scanner.tokenize();
-
-    errorListener.throwIfErrors();
-
-    var parser = new Parser(stringSource, errorListener);
-    var node = parser.parseCompilationUnit(startToken);
-
-    errorListener.throwIfErrors();
-
-    var visitor = new _SourceVisitor(sink);
-    node.accept(visitor);
-  }
-}
-
-class _ErrorListener implements AnalysisErrorListener {
-  final errors = <AnalysisError>[];
-
-  @override
-  void onError(AnalysisError error) {
-    errors.add(error);
-  }
-
-  void throwIfErrors() {
-    if (errors.isNotEmpty) {
-      throw new Exception(errors);
-    }
-  }
-}
-
-class _SourceVisitor extends GeneralizingAstVisitor {
-  int indent = 0;
-
-  final IOSink sink;
-  _SourceVisitor(this.sink);
-
-  String asString(AstNode node) =>
-      typeInfo(node.runtimeType) + ' [${node.toString()}]';
-
-  List<CommentToken> getPrecedingComments(Token token) {
-    var comments = <CommentToken>[];
-    var comment = token.precedingComments;
-    while (comment is CommentToken) {
-      comments.add(comment);
-      comment = comment.next;
-    }
-    return comments;
-  }
-
-  String getTrailingComment(AstNode node) {
-    var successor = node.endToken.next;
-    if (successor != null) {
-      var precedingComments = successor.precedingComments;
-      if (precedingComments != null) {
-        return precedingComments.toString();
-      }
-    }
-    return '';
-  }
-
-  String typeInfo(Type type) => type.toString();
-
-  @override
-  visitNode(AstNode node) {
-    write(node);
-
-    ++indent;
-    node.visitChildren(this);
-    --indent;
-    return null;
-  }
-
-  write(AstNode node) {
-    //EOL comments
-    var comments = getPrecedingComments(node.beginToken);
-    comments.forEach((c) => sink.writeln('${"  " * indent}$c'));
-
-    sink.writeln(
-        '${"  " * indent}${asString(node)} ${getTrailingComment(node)}');
-  }
-}