Move pkg/path to pkg/pathos.

pkg/path/lib/path.dart

Index: pkg/path/lib/path.dart
diff --git a/pkg/path/lib/path.dart b/pkg/path/lib/path.dart
deleted file mode 100644
index 3bd23323b0345de558047b114a62a37f92c7b83b..0000000000000000000000000000000000000000
--- a/pkg/path/lib/path.dart
+++ /dev/null
@@ -1,701 +0,0 @@
-// Copyright (c) 2012, 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.
-
-/// A comprehensive, cross-platform path manipulation library.
-library path;
-
-import 'dart:io' as io;
-
-/// An internal builder for the current OS so we can provide a straight
-/// functional interface and not require users to create one.
-final _builder = new Builder();
-
-/// Gets the path to the current working directory.
-String get current => new io.Directory.current().path;
-
-/// Gets the path separator for the current platform. On Mac and Linux, this
-/// is `/`. On Windows, it's `\`.
-String get separator => _builder.separator;
-
-/// Converts [path] to an absolute path by resolving it relative to the current
-/// working directory. If [path] is already an absolute path, just returns it.
-///
-///     path.absolute('foo/bar.txt'); // -> /your/current/dir/foo/bar.txt
-String absolute(String path) => join(current, path);
-
-/// Gets the part of [path] after the last separator.
-///
-///     path.basename('path/to/foo.dart'); // -> 'foo.dart'
-///     path.basename('path/to');          // -> 'to'
-///
-/// Trailing separators are ignored.
-///
-///     builder.basename('path/to/'); // -> 'to'
-String basename(String path) => _builder.basename(path);
-
-/// Gets the part of [path] after the last separator, and without any trailing
-/// file extension.
-///
-///     path.basenameWithoutExtension('path/to/foo.dart'); // -> 'foo'
-///
-/// Trailing separators are ignored.
-///
-///     builder.basenameWithoutExtension('path/to/foo.dart/'); // -> 'foo'
-String basenameWithoutExtension(String path) =>
-    _builder.basenameWithoutExtension(path);
-
-/// Gets the part of [path] before the last separator.
-///
-///     path.dirname('path/to/foo.dart'); // -> 'path/to'
-///     path.dirname('path/to');          // -> 'to'
-///
-/// Trailing separators are ignored.
-///
-///     builder.dirname('path/to/'); // -> 'path'
-String dirname(String path) => _builder.dirname(path);
-
-/// Gets the file extension of [path]: the portion of [basename] from the last
-/// `.` to the end (including the `.` itself).
-///
-///     path.extension('path/to/foo.dart');    // -> '.dart'
-///     path.extension('path/to/foo');         // -> ''
-///     path.extension('path.to/foo');         // -> ''
-///     path.extension('path/to/foo.dart.js'); // -> '.js'
-///
-/// If the file name starts with a `.`, then that is not considered the
-/// extension:
-///
-///     path.extension('~/.bashrc');    // -> ''
-///     path.extension('~/.notes.txt'); // -> '.txt'
-String extension(String path) => _builder.extension(path);
-
-// TODO(nweiz): add a UNC example for Windows once issue 7323 is fixed.
-/// Returns the root of [path], if it's absolute, or the empty string if it's
-/// relative.
-///
-///     // Unix
-///     path.rootPrefix('path/to/foo'); // -> ''
-///     path.rootPrefix('/path/to/foo'); // -> '/'
-///
-///     // Windows
-///     path.rootPrefix(r'path\to\foo'); // -> ''
-///     path.rootPrefix(r'C:\path\to\foo'); // -> r'C:\'
-String rootPrefix(String path) => _builder.rootPrefix(path);
-
-/// Returns `true` if [path] is an absolute path and `false` if it is a
-/// relative path. On POSIX systems, absolute paths start with a `/` (forward
-/// slash). On Windows, an absolute path starts with `\\`, or a drive letter
-/// followed by `:/` or `:\`.
-bool isAbsolute(String path) => _builder.isAbsolute(path);
-
-/// Returns `true` if [path] is a relative path and `false` if it is absolute.
-/// On POSIX systems, absolute paths start with a `/` (forward slash). On
-/// Windows, an absolute path starts with `\\`, or a drive letter followed by
-/// `:/` or `:\`.
-bool isRelative(String path) => _builder.isRelative(path);
-
-/// Joins the given path parts into a single path using the current platform's
-/// [separator]. Example:
-///
-///     path.join('path', 'to', 'foo'); // -> 'path/to/foo'
-///
-/// If any part ends in a path separator, then a redundant separator will not
-/// be added:
-///
-///     path.join('path/', 'to', 'foo'); // -> 'path/to/foo
-///
-/// If a part is an absolute path, then anything before that will be ignored:
-///
-///     path.join('path', '/to', 'foo'); // -> '/to/foo'
-String join(String part1, [String part2, String part3, String part4,
-            String part5, String part6, String part7, String part8]) =>
-  _builder.join(part1, part2, part3, part4, part5, part6, part7, part8);
-
-// TODO(nweiz): add a UNC example for Windows once issue 7323 is fixed.
-/// Splits [path] into its components using the current platform's [separator].
-///
-///     path.split('path/to/foo'); // -> ['path', 'to', 'foo']
-///
-/// The path will *not* be normalized before splitting.
-///
-///     path.split('path/../foo'); // -> ['path', '..', 'foo']
-///
-/// If [path] is absolute, the root directory will be the first element in the
-/// array. Example:
-///
-///     // Unix
-///     path.split('/path/to/foo'); // -> ['/', 'path', 'to', 'foo']
-///
-///     // Windows
-///     path.split(r'C:\path\to\foo'); // -> [r'C:\', 'path', 'to', 'foo']
-List<String> split(String path) => _builder.split(path);
-
-/// Normalizes [path], simplifying it by handling `..`, and `.`, and
-/// removing redundant path separators whenever possible.
-///
-///     path.normalize('path/./to/..//file.text'); // -> 'path/file.txt'
-String normalize(String path) => _builder.normalize(path);
-
-/// Attempts to convert [path] to an equivalent relative path from the current
-/// directory.
-///
-///     // Given current directory is /root/path:
-///     path.relative('/root/path/a/b.dart'); // -> 'a/b.dart'
-///     path.relative('/root/other.dart'); // -> '../other.dart'
-///
-/// If the [from] argument is passed, [path] is made relative to that instead.
-///
-///     path.relative('/root/path/a/b.dart',
-///         from: '/root/path'); // -> 'a/b.dart'
-///     path.relative('/root/other.dart',
-///         from: '/root/path'); // -> '../other.dart'
-///
-/// Since there is no relative path from one drive letter to another on Windows,
-/// this will return an absolute path in that case.
-///
-///     path.relative(r'D:\other', from: r'C:\home'); // -> 'D:\other'
-String relative(String path, {String from}) =>
-    _builder.relative(path, from: from);
-
-/// Removes a trailing extension from the last part of [path].
-///
-///     withoutExtension('path/to/foo.dart'); // -> 'path/to/foo'
-String withoutExtension(String path) => _builder.withoutExtension(path);
-
-/// Validates that there are no non-null arguments following a null one and
-/// throws an appropriate [ArgumentError] on failure.
-_validateArgList(String method, List<String> args) {
-  for (var i = 1; i < args.length; i++) {
-    // Ignore nulls hanging off the end.
-    if (args[i] == null || args[i - 1] != null) continue;
-
-    var numArgs;
-    for (numArgs = args.length; numArgs >= 1; numArgs--) {
-      if (args[numArgs - 1] != null) break;
-    }
-
-    // Show the arguments.
-    var message = new StringBuffer();
-    message.add("$method(");
-    message.add(args.take(numArgs)
-        .map((arg) => arg == null ? "null" : '"$arg"')
-        .join(", "));
-    message.add("): part ${i - 1} was null, but part $i was not.");
-    throw new ArgumentError(message.toString());
-  }
-}
-
-/// An instantiable class for manipulating paths. Unlike the top-level
-/// functions, this lets you explicitly select what platform the paths will use.
-class Builder {
-  /// Creates a new path builder for the given style and root directory.
-  ///
-  /// If [style] is omitted, it uses the host operating system's path style. If
-  /// [root] is omitted, it defaults to the current working directory. If [root]
-  /// is relative, it is considered relative to the current working directory.
-  factory Builder({Style style, String root}) {
-    if (style == null) {
-      if (io.Platform.operatingSystem == 'windows') {
-        style = Style.windows;
-      } else {
-        style = Style.posix;
-      }
-    }
-
-    if (root == null) root = current;
-
-    return new Builder._(style, root);
-  }
-
-  Builder._(this.style, this.root);
-
-  /// The style of path that this builder works with.
-  final Style style;
-
-  /// The root directory that relative paths will be relative to.
-  final String root;
-
-  /// Gets the path separator for the builder's [style]. On Mac and Linux,
-  /// this is `/`. On Windows, it's `\`.
-  String get separator => style.separator;
-
-  /// Gets the part of [path] after the last separator on the builder's
-  /// platform.
-  ///
-  ///     builder.basename('path/to/foo.dart'); // -> 'foo.dart'
-  ///     builder.basename('path/to');          // -> 'to'
-  ///
-  /// Trailing separators are ignored.
-  ///
-  ///     builder.dirname('path/to/'); // -> 'to'
-  String basename(String path) => _parse(path).basename;
-
-  /// Gets the part of [path] after the last separator on the builder's
-  /// platform, and without any trailing file extension.
-  ///
-  ///     builder.basenameWithoutExtension('path/to/foo.dart'); // -> 'foo'
-  ///
-  /// Trailing separators are ignored.
-  ///
-  ///     builder.dirname('path/to/foo.dart/'); // -> 'foo'
-  String basenameWithoutExtension(String path) =>
-    _parse(path).basenameWithoutExtension;
-
-  /// Gets the part of [path] before the last separator.
-  ///
-  ///     builder.dirname('path/to/foo.dart'); // -> 'path/to'
-  ///     builder.dirname('path/to');          // -> 'path'
-  ///
-  /// Trailing separators are ignored.
-  ///
-  ///     builder.dirname('path/to/'); // -> 'path'
-  String dirname(String path) {
-    var parsed = _parse(path);
-    parsed.removeTrailingSeparators();
-    if (parsed.parts.isEmpty) return parsed.root == null ? '.' : parsed.root;
-    if (parsed.parts.length == 1) {
-      return parsed.root == null ? '.' : parsed.root;
-    }
-    parsed.parts.removeLast();
-    parsed.separators.removeLast();
-    parsed.removeTrailingSeparators();
-    return parsed.toString();
-  }
-
-  /// Gets the file extension of [path]: the portion of [basename] from the last
-  /// `.` to the end (including the `.` itself).
-  ///
-  ///     builder.extension('path/to/foo.dart'); // -> '.dart'
-  ///     builder.extension('path/to/foo'); // -> ''
-  ///     builder.extension('path.to/foo'); // -> ''
-  ///     builder.extension('path/to/foo.dart.js'); // -> '.js'
-  ///
-  /// If the file name starts with a `.`, then it is not considered an
-  /// extension:
-  ///
-  ///     builder.extension('~/.bashrc');    // -> ''
-  ///     builder.extension('~/.notes.txt'); // -> '.txt'
-  String extension(String path) => _parse(path).extension;
-
-  // TODO(nweiz): add a UNC example for Windows once issue 7323 is fixed.
-  /// Returns the root of [path], if it's absolute, or an empty string if it's
-  /// relative.
-  ///
-  ///     // Unix
-  ///     builder.rootPrefix('path/to/foo'); // -> ''
-  ///     builder.rootPrefix('/path/to/foo'); // -> '/'
-  ///
-  ///     // Windows
-  ///     builder.rootPrefix(r'path\to\foo'); // -> ''
-  ///     builder.rootPrefix(r'C:\path\to\foo'); // -> r'C:\'
-  String rootPrefix(String path) {
-    var root = _parse(path).root;
-    return root == null ? '' : root;
-  }
-
-  /// Returns `true` if [path] is an absolute path and `false` if it is a
-  /// relative path. On POSIX systems, absolute paths start with a `/` (forward
-  /// slash). On Windows, an absolute path starts with `\\`, or a drive letter
-  /// followed by `:/` or `:\`.
-  bool isAbsolute(String path) => _parse(path).isAbsolute;
-
-  /// Returns `true` if [path] is a relative path and `false` if it is absolute.
-  /// On POSIX systems, absolute paths start with a `/` (forward slash). On
-  /// Windows, an absolute path starts with `\\`, or a drive letter followed by
-  /// `:/` or `:\`.
-  bool isRelative(String path) => !isAbsolute(path);
-
-  /// Joins the given path parts into a single path. Example:
-  ///
-  ///     builder.join('path', 'to', 'foo'); // -> 'path/to/foo'
-  ///
-  /// If any part ends in a path separator, then a redundant separator will not
-  /// be added:
-  ///
-  ///     builder.join('path/', 'to', 'foo'); // -> 'path/to/foo
-  ///
-  /// If a part is an absolute path, then anything before that will be ignored:
-  ///
-  ///     builder.join('path', '/to', 'foo'); // -> '/to/foo'
-  ///
-  String join(String part1, [String part2, String part3, String part4,
-              String part5, String part6, String part7, String part8]) {
-    var buffer = new StringBuffer();
-    var needsSeparator = false;
-
-    var parts = [part1, part2, part3, part4, part5, part6, part7, part8];
-    _validateArgList("join", parts);
-
-    for (var part in parts) {
-      if (part == null) continue;
-
-      if (this.isAbsolute(part)) {
-        // An absolute path discards everything before it.
-        buffer.clear();
-        buffer.add(part);
-      } else {
-        if (part.length > 0 && part[0].contains(style.separatorPattern)) {
-          // The part starts with a separator, so we don't need to add one.
-        } else if (needsSeparator) {
-          buffer.add(separator);
-        }
-
-        buffer.add(part);
-      }
-
-      // Unless this part ends with a separator, we'll need to add one before
-      // the next part.
-      needsSeparator = part.length > 0 &&
-          !part[part.length - 1].contains(style.separatorPattern);
-    }
-
-    return buffer.toString();
-  }
-
-  // TODO(nweiz): add a UNC example for Windows once issue 7323 is fixed.
-  /// Splits [path] into its components using the current platform's
-  /// [separator]. Example:
-  ///
-  ///     builder.split('path/to/foo'); // -> ['path', 'to', 'foo']
-  ///
-  /// The path will *not* be normalized before splitting.
-  ///
-  ///     builder.split('path/../foo'); // -> ['path', '..', 'foo']
-  ///
-  /// If [path] is absolute, the root directory will be the first element in the
-  /// array. Example:
-  ///
-  ///     // Unix
-  ///     builder.split('/path/to/foo'); // -> ['/', 'path', 'to', 'foo']
-  ///
-  ///     // Windows
-  ///     builder.split(r'C:\path\to\foo'); // -> [r'C:\', 'path', 'to', 'foo']
-  List<String> split(String path) {
-    var parsed = _parse(path);
-    // Filter out empty parts that exist due to multiple separators in a row.
-    parsed.parts = parsed.parts.where((part) => !part.isEmpty).toList();
-    if (parsed.root != null) parsed.parts.insertRange(0, 1, parsed.root);
-    return parsed.parts;
-  }
-
-  /// Normalizes [path], simplifying it by handling `..`, and `.`, and
-  /// removing redundant path separators whenever possible.
-  ///
-  ///     builder.normalize('path/./to/..//file.text'); // -> 'path/file.txt'
-  String normalize(String path) {
-    if (path == '') return path;
-
-    var parsed = _parse(path);
-    parsed.normalize();
-    return parsed.toString();
-  }
-
-  /// Creates a new path by appending the given path parts to the [root].
-  /// Equivalent to [join()] with [root] as the first argument. Example:
-  ///
-  ///     var builder = new Builder(root: 'root');
-  ///     builder.resolve('path', 'to', 'foo'); // -> 'root/path/to/foo'
-  String resolve(String part1, [String part2, String part3, String part4,
-              String part5, String part6, String part7]) {
-    return join(root, part1, part2, part3, part4, part5, part6, part7);
-  }
-
-  /// Attempts to convert [path] to an equivalent relative path relative to
-  /// [root].
-  ///
-  ///     var builder = new Builder(root: '/root/path');
-  ///     builder.relative('/root/path/a/b.dart'); // -> 'a/b.dart'
-  ///     builder.relative('/root/other.dart'); // -> '../other.dart'
-  ///
-  /// If the [from] argument is passed, [path] is made relative to that instead.
-  ///
-  ///     builder.relative('/root/path/a/b.dart',
-  ///         from: '/root/path'); // -> 'a/b.dart'
-  ///     builder.relative('/root/other.dart',
-  ///         from: '/root/path'); // -> '../other.dart'
-  ///
-  /// Since there is no relative path from one drive letter to another on
-  /// Windows, this will return an absolute path in that case.
-  ///
-  ///     builder.relative(r'D:\other', from: r'C:\other'); // -> 'D:\other'
-  ///
-  /// This will also return an absolute path if an absolute [path] is passed to
-  /// a builder with a relative [root].
-  ///
-  ///     var builder = new Builder(r'some/relative/path');
-  ///     builder.relative(r'/absolute/path'); // -> '/absolute/path'
-  String relative(String path, {String from}) {
-    if (path == '') return '.';
-
-    from = from == null ? root : this.join(root, from);
-
-    // We can't determine the path from a relative path to an absolute path.
-    if (this.isRelative(from) && this.isAbsolute(path)) {
-      return this.normalize(path);
-    }
-
-    // If the given path is relative, resolve it relative to the root of the
-    // builder.
-    if (this.isRelative(path)) path = this.resolve(path);
-
-    // If the path is still relative and `from` is absolute, we're unable to
-    // find a path from `from` to `path`.
-    if (this.isRelative(path) && this.isAbsolute(from)) {
-      throw new ArgumentError('Unable to find a path to "$path" from "$from".');
-    }
-
-    var fromParsed = _parse(from)..normalize();
-    var pathParsed = _parse(path)..normalize();
-
-    // If the root prefixes don't match (for example, different drive letters
-    // on Windows), then there is no relative path, so just return the absolute
-    // one. In Windows, drive letters are case-insenstive and we allow
-    // calculation of relative paths, even if a path has not been normalized.
-    if (fromParsed.root != pathParsed.root &&
-        ((fromParsed.root ==  null || pathParsed.root == null) ||
-          fromParsed.root.toLowerCase().replaceAll('/', '\\') !=
-          pathParsed.root.toLowerCase().replaceAll('/', '\\'))) {
-      return pathParsed.toString();
-    }
-
-    // Strip off their common prefix.
-    while (fromParsed.parts.length > 0 && pathParsed.parts.length > 0 &&
-           fromParsed.parts[0] == pathParsed.parts[0]) {
-      fromParsed.parts.removeAt(0);
-      fromParsed.separators.removeAt(0);
-      pathParsed.parts.removeAt(0);
-      pathParsed.separators.removeAt(0);
-    }
-
-    // If there are any directories left in the root path, we need to walk up
-    // out of them.
-    pathParsed.parts.insertRange(0, fromParsed.parts.length, '..');
-    pathParsed.separators.insertRange(0, fromParsed.parts.length,
-        style.separator);
-
-    // Corner case: the paths completely collapsed.
-    if (pathParsed.parts.length == 0) return '.';
-
-    // Make it relative.
-    pathParsed.root = '';
-    pathParsed.removeTrailingSeparators();
-
-    return pathParsed.toString();
-  }
-
-  /// Removes a trailing extension from the last part of [path].
-  ///
-  ///     builder.withoutExtension('path/to/foo.dart'); // -> 'path/to/foo'
-  String withoutExtension(String path) {
-    var parsed = _parse(path);
-
-    for (var i = parsed.parts.length - 1; i >= 0; i--) {
-      if (!parsed.parts[i].isEmpty) {
-        parsed.parts[i] = parsed.basenameWithoutExtension;
-        break;
-      }
-    }
-
-    return parsed.toString();
-  }
-
-  _ParsedPath _parse(String path) {
-    var before = path;
-
-    // Remove the root prefix, if any.
-    var root = style.getRoot(path);
-    if (root != null) path = path.substring(root.length);
-
-    // Split the parts on path separators.
-    var parts = [];
-    var separators = [];
-    var start = 0;
-    for (var match in style.separatorPattern.allMatches(path)) {
-      parts.add(path.substring(start, match.start));
-      separators.add(match[0]);
-      start = match.end;
-    }
-
-    // Add the final part, if any.
-    if (start < path.length) {
-      parts.add(path.substring(start));
-      separators.add('');
-    }
-
-    return new _ParsedPath(style, root, parts, separators);
-  }
-}
-
-/// An enum type describing a "flavor" of path.
-class Style {
-  /// POSIX-style paths use "/" (forward slash) as separators. Absolute paths
-  /// start with "/". Used by UNIX, Linux, Mac OS X, and others.
-  static final posix = new Style._('posix', '/', '/', '/');
-
-  /// Windows paths use "\" (backslash) as separators. Absolute paths start with
-  /// a drive letter followed by a colon (example, "C:") or two backslashes
-  /// ("\\") for UNC paths.
-  // TODO(rnystrom): The UNC root prefix should include the drive name too, not
-  // just the "\\".
-  static final windows = new Style._('windows', '\\', r'[/\\]',
-      r'\\\\|[a-zA-Z]:[/\\]');
-
-  Style._(this.name, this.separator, String separatorPattern,
-      String rootPattern)
-    : separatorPattern = new RegExp(separatorPattern),
-      _rootPattern = new RegExp('^$rootPattern');
-
-  /// The name of this path style. Will be "posix" or "windows".
-  final String name;
-
-  /// The path separator for this style. On POSIX, this is `/`. On Windows,
-  /// it's `\`.
-  final String separator;
-
-  /// The [Pattern] that can be used to match a separator for a path in this
-  /// style. Windows allows both "/" and "\" as path separators even though
-  /// "\" is the canonical one.
-  final Pattern separatorPattern;
-
-  // TODO(nweiz): make this a Pattern when issue 7080 is fixed.
-  /// The [RegExp] that can be used to match the root prefix of an absolute
-  /// path in this style.
-  final RegExp _rootPattern;
-
-  /// Gets the root prefix of [path] if path is absolute. If [path] is relative,
-  /// returns `null`.
-  String getRoot(String path) {
-    var match = _rootPattern.firstMatch(path);
-    if (match == null) return null;
-    return match[0];
-  }
-
-  String toString() => name;
-}
-
-// TODO(rnystrom): Make this public?
-class _ParsedPath {
-  /// The [Style] that was used to parse this path.
-  Style style;
-
-  /// The absolute root portion of the path, or `null` if the path is relative.
-  /// On POSIX systems, this will be `null` or "/". On Windows, it can be
-  /// `null`, "//" for a UNC path, or something like "C:\" for paths with drive
-  /// letters.
-  String root;
-
-  /// The path-separated parts of the path. All but the last will be
-  /// directories.
-  List<String> parts;
-
-  /// The path separators following each part. The last one will be an empty
-  /// string unless the path ends with a trailing separator.
-  List<String> separators;
-
-  /// The file extension of the last part, or "" if it doesn't have one.
-  String get extension => _splitExtension()[1];
-
-  /// `true` if this is an absolute path.
-  bool get isAbsolute => root != null;
-
-  _ParsedPath(this.style, this.root, this.parts, this.separators);
-
-  String get basename {
-    var copy = this.clone();
-    copy.removeTrailingSeparators();
-    if (copy.parts.isEmpty) return root == null ? '' : root;
-    return copy.parts.last;
-  }
-
-  String get basenameWithoutExtension {
-    var copy = this.clone();
-    copy.removeTrailingSeparators();
-    if (copy.parts.isEmpty) return root == null ? '' : root;
-    return copy._splitExtension()[0];
-  }
-
-  void removeTrailingSeparators() {
-    while (!parts.isEmpty && parts.last == '') {
-      parts.removeLast();
-      separators.removeLast();
-    }
-    if (separators.length > 0) separators[separators.length - 1] = '';
-  }
-
-  void normalize() {
-    // Handle '.', '..', and empty parts.
-    var leadingDoubles = 0;
-    var newParts = [];
-    for (var part in parts) {
-      if (part == '.' || part == '') {
-        // Do nothing. Ignore it.
-      } else if (part == '..') {
-        // Pop the last part off.
-        if (newParts.length > 0) {
-          newParts.removeLast();
-        } else {
-          // Backed out past the beginning, so preserve the "..".
-          leadingDoubles++;
-        }
-      } else {
-        newParts.add(part);
-      }
-    }
-
-    // A relative path can back out from the start directory.
-    if (!isAbsolute) {
-      newParts.insertRange(0, leadingDoubles, '..');
-    }
-
-    // If we collapsed down to nothing, do ".".
-    if (newParts.length == 0 && !isAbsolute) {
-      newParts.add('.');
-    }
-
-    // Canonicalize separators.
-    var newSeparators = [];
-    newSeparators.insertRange(0, newParts.length, style.separator);
-
-    parts = newParts;
-    separators = newSeparators;
-
-    // Normalize the Windows root if needed.
-    if (root != null && style == Style.windows) {
-      root = root.replaceAll('/', '\\');
-    }
-    removeTrailingSeparators();
-  }
-
-  String toString() {
-    var builder = new StringBuffer();
-    if (root != null) builder.add(root);
-    for (var i = 0; i < parts.length; i++) {
-      builder.add(parts[i]);
-      builder.add(separators[i]);
-    }
-
-    return builder.toString();
-  }
-
-  /// Splits the last part of the path into a two-element list. The first is
-  /// the name of the file without any extension. The second is the extension
-  /// or "" if it has none.
-  List<String> _splitExtension() {
-    if (parts.isEmpty) return ['', ''];
-
-    var file = parts.last;
-    if (file == '..') return ['..', ''];
-
-    var lastDot = file.lastIndexOf('.');
-
-    // If there is no dot, or it's the first character, like '.bashrc', it
-    // doesn't count.
-    if (lastDot <= 0) return [file, ''];
-
-    return [file.substring(0, lastDot), file.substring(lastDot)];
-  }
-
-  _ParsedPath clone() => new _ParsedPath(
-      style, root, new List.from(parts), new List.from(separators));
-}