Fix build break in dartdoc.

utils/dartdoc/files.dart

-// Copyright (c) 2011, 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.
-
-// Functions for working with files and paths.
-
-/** The path to the file currently being written to, relative to [outdir]. */
-String _filePath;
-
-/** The file currently being written to. */
-StringBuffer _file;
-
-/** Path to generate HTML files into. */
-final _outdir = 'docs';
-
-startFile(String path) {
-  _filePath = path;
-  _file = new StringBuffer();
-}
-
-write(String s) {
-  _file.add(s);
-}
-
-writeln(String s) {
-  write(s);
-  write('\n');
-}
-
-endFile() {
-  String outPath = '$_outdir/$_filePath';
-  world.files.createDirectory(dirname(outPath), recursive: true);
-
-  world.files.writeString(outPath, _file.toString());
-  _filePath = null;
-  _file = null;
-}
-
-/**
- * Converts [fullPath] which is understood to be a full path from the root of
- * the generated docs to one relative to the current file.
- */
-String relativePath(String fullPath) {
-  // Don't make it relative if it's an absolute path.
-  if (isAbsolute(fullPath)) return fullPath;
-
-  // TODO(rnystrom): Walks all the way up to root each time. Shouldn't do this
-  // if the paths overlap.
-  return repeat('../', countOccurrences(_filePath, '/')) + fullPath;
-}
-
-/** Gets whether or not the given URL is absolute or relative. */
-bool isAbsolute(String url) {
-  // TODO(rnystrom): This is a bit hackish. We consider any URL that lacks
-  // a scheme to be relative.
-  return const RegExp(@'^\w+:').hasMatch(url);
-}
-
-/** Gets the URL to the documentation for [library]. */
-libraryUrl(Library library) => '${sanitize(library.name)}.html';
-
-/** Gets the URL for the documentation for [type]. */
-typeUrl(Type type) {
-  if (type.isTop) return '${sanitize(type.library.name)}.html';
-  // Always get the generic type to strip off any type parameters or arguments.
-  // If the type isn't generic, genericType returns `this`, so it works for
-  // non-generic types too.
-  return '${sanitize(type.library.name)}/${type.genericType.name}.html';
-}
-
-/** Gets the URL for the documentation for [member]. */
-memberUrl(Member member) {
-  final typeUrl = typeUrl(member.declaringType);
-  if (!member.isConstructor) return '$typeUrl#${member.name}';
-  if (member.constructorName == '') return '$typeUrl#new:${member.name}';
-  return '$typeUrl#new:${member.name}.${member.constructorName}';
-}
-
-/** Gets the anchor id for the document for [member]. */
-memberAnchor(Member member) => '${member.name}';