Support a URL style for pathos.

pkg/pathos/test/pathos_url_test.dart

 // 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.
 
-library pathos_posix_test;
-
 import 'dart:io' as io;
 
 import 'package:unittest/unittest.dart';
 import 'package:pathos/path.dart' as path;
 
 main() {
-  var builder = new path.Builder(style: path.Style.posix, root: '/root/path');
-
-  if (new path.Builder().style == path.Style.posix) {
-    group('absolute', () {
-      expect(path.absolute('a/b.txt'), path.join(path.current, 'a/b.txt'));
-      expect(path.absolute('/a/b.txt'), '/a/b.txt');
-    });
-  }
+  var builder = new path.Builder(style: path.Style.url,
+      root: 'http://dartlang.org/root/path');
 
   test('separator', () {
     expect(builder.separator, '/');
   });
 
   test('extension', () {
     expect(builder.extension(''), '');
     expect(builder.extension('foo.dart'), '.dart');
     expect(builder.extension('foo.dart.js'), '.js');
     expect(builder.extension('a.b/c'), '');
     expect(builder.extension('a.b/c.d'), '.d');
-    expect(builder.extension('~/.bashrc'), '');
     expect(builder.extension(r'a.b\c'), r'.b\c');
   });
 
   test('rootPrefix', () {
     expect(builder.rootPrefix(''), '');
     expect(builder.rootPrefix('a'), '');
     expect(builder.rootPrefix('a/b'), '');
+    expect(builder.rootPrefix('http://dartlang.org/a/c'),
+        'http://dartlang.org');
+    expect(builder.rootPrefix('file:///a/c'), 'file://');
     expect(builder.rootPrefix('/a/c'), '/');
+    expect(builder.rootPrefix('http://dartlang.org/'), 'http://dartlang.org');
+    expect(builder.rootPrefix('file:///'), 'file://');
+    expect(builder.rootPrefix('http://dartlang.org'), 'http://dartlang.org');
+    expect(builder.rootPrefix('file://'), 'file://');
     expect(builder.rootPrefix('/'), '/');
   });
 
   test('dirname', () {
     expect(builder.dirname(''), '.');
     expect(builder.dirname('a'), '.');
     expect(builder.dirname('a/b'), 'a');
     expect(builder.dirname('a/b/c'), 'a/b');
     expect(builder.dirname('a/b.c'), 'a');
     expect(builder.dirname('a/'), '.');
     expect(builder.dirname('a/.'), 'a');
     expect(builder.dirname(r'a\b/c'), r'a\b');
+    expect(builder.dirname('http://dartlang.org/a'), 'http://dartlang.org');
+    expect(builder.dirname('file:///a'), 'file://');
     expect(builder.dirname('/a'), '/');
+    expect(builder.dirname('http://dartlang.org///a'), 'http://dartlang.org');
+    expect(builder.dirname('file://///a'), 'file://');
     expect(builder.dirname('///a'), '/');
+    expect(builder.dirname('http://dartlang.org/'), 'http://dartlang.org');
+    expect(builder.dirname('http://dartlang.org'), 'http://dartlang.org');
+    expect(builder.dirname('file:///'), 'file://');
+    expect(builder.dirname('file://'), 'file://');
     expect(builder.dirname('/'), '/');
+    expect(builder.dirname('http://dartlang.org///'), 'http://dartlang.org');
+    expect(builder.dirname('file://///'), 'file://');
     expect(builder.dirname('///'), '/');
     expect(builder.dirname('a/b/'), 'a');
     expect(builder.dirname(r'a/b\c'), 'a');
     expect(builder.dirname('a//'), '.');
     expect(builder.dirname('a/b//'), 'a');
     expect(builder.dirname('a//b'), 'a');
   });
 
   test('basename', () {
     expect(builder.basename(''), '');
     expect(builder.basename('a'), 'a');
     expect(builder.basename('a/b'), 'b');
     expect(builder.basename('a/b/c'), 'c');
     expect(builder.basename('a/b.c'), 'b.c');
     expect(builder.basename('a/'), 'a');
     expect(builder.basename('a/.'), '.');
     expect(builder.basename(r'a\b/c'), 'c');
+    expect(builder.basename('http://dartlang.org/a'), 'a');
+    expect(builder.basename('file:///a'), 'a');
     expect(builder.basename('/a'), 'a');
+    expect(builder.basename('http://dartlang.org/'), 'http://dartlang.org');
+    expect(builder.basename('http://dartlang.org'), 'http://dartlang.org');
+    expect(builder.basename('file:///'), 'file://');
+    expect(builder.basename('file://'), 'file://');
     expect(builder.basename('/'), '/');
     expect(builder.basename('a/b/'), 'b');
     expect(builder.basename(r'a/b\c'), r'b\c');
     expect(builder.basename('a//'), 'a');
     expect(builder.basename('a/b//'), 'b');
     expect(builder.basename('a//b'), 'b');
   });
 
   test('basenameWithoutExtension', () {
     expect(builder.basenameWithoutExtension(''), '');
@@ skipping 10 matching lines @@
     expect(builder.basenameWithoutExtension('a/b//'), 'b');
     expect(builder.basenameWithoutExtension('a//b'), 'b');
     expect(builder.basenameWithoutExtension('a/b.c/'), 'b');
     expect(builder.basenameWithoutExtension('a/b.c//'), 'b');
   });
 
   test('isAbsolute', () {
     expect(builder.isAbsolute(''), false);
     expect(builder.isAbsolute('a'), false);
     expect(builder.isAbsolute('a/b'), false);
+    expect(builder.isAbsolute('http://dartlang.org/a'), true);
+    expect(builder.isAbsolute('file:///a'), true);
     expect(builder.isAbsolute('/a'), true);
+    expect(builder.isAbsolute('http://dartlang.org/a/b'), true);
+    expect(builder.isAbsolute('file:///a/b'), true);
     expect(builder.isAbsolute('/a/b'), true);
+    expect(builder.isAbsolute('http://dartlang.org/'), true);
+    expect(builder.isAbsolute('file:///'), true);
+    expect(builder.isAbsolute('http://dartlang.org'), true);
+    expect(builder.isAbsolute('file://'), true);
+    expect(builder.isAbsolute('/'), true);
     expect(builder.isAbsolute('~'), false);
     expect(builder.isAbsolute('.'), false);
     expect(builder.isAbsolute('../a'), false);
     expect(builder.isAbsolute('C:/a'), false);
     expect(builder.isAbsolute(r'C:\a'), false);
     expect(builder.isAbsolute(r'\\a'), false);
   });
 
   test('isRelative', () {
     expect(builder.isRelative(''), true);
     expect(builder.isRelative('a'), true);
     expect(builder.isRelative('a/b'), true);
+    expect(builder.isRelative('http://dartlang.org/a'), false);
+    expect(builder.isRelative('file:///a'), false);
     expect(builder.isRelative('/a'), false);
+    expect(builder.isRelative('http://dartlang.org/a/b'), false);
+    expect(builder.isRelative('file:///a/b'), false);
     expect(builder.isRelative('/a/b'), false);
+    expect(builder.isRelative('http://dartlang.org/'), false);
+    expect(builder.isRelative('file:///'), false);
+    expect(builder.isRelative('http://dartlang.org'), false);
+    expect(builder.isRelative('file://'), false);
+    expect(builder.isRelative('/'), false);
     expect(builder.isRelative('~'), true);
     expect(builder.isRelative('.'), true);
     expect(builder.isRelative('../a'), true);
     expect(builder.isRelative('C:/a'), true);
     expect(builder.isRelative(r'C:\a'), true);
     expect(builder.isRelative(r'\\a'), true);
   });
 
+  test('isRootRelative', () {
+    expect(builder.isRootRelative(''), false);
+    expect(builder.isRootRelative('a'), false);
+    expect(builder.isRootRelative('a/b'), false);
+    expect(builder.isRootRelative('http://dartlang.org/a'), false);
+    expect(builder.isRootRelative('file:///a'), false);
+    expect(builder.isRootRelative('/a'), true);
+    expect(builder.isRootRelative('http://dartlang.org/a/b'), false);
+    expect(builder.isRootRelative('file:///a/b'), false);
+    expect(builder.isRootRelative('/a/b'), true);
+    expect(builder.isRootRelative('http://dartlang.org/'), false);
+    expect(builder.isRootRelative('file:///'), false);
+    expect(builder.isRootRelative('http://dartlang.org'), false);
+    expect(builder.isRootRelative('file://'), false);
+    expect(builder.isRootRelative('/'), true);
+    expect(builder.isRootRelative('~'), false);
+    expect(builder.isRootRelative('.'), false);
+    expect(builder.isRootRelative('../a'), false);
+    expect(builder.isRootRelative('C:/a'), false);
+    expect(builder.isRootRelative(r'C:\a'), false);
+    expect(builder.isRootRelative(r'\\a'), false);
+  });
+
   group('join', () {
     test('allows up to eight parts', () {
       expect(builder.join('a'), 'a');
       expect(builder.join('a', 'b'), 'a/b');
       expect(builder.join('a', 'b', 'c'), 'a/b/c');
       expect(builder.join('a', 'b', 'c', 'd'), 'a/b/c/d');
       expect(builder.join('a', 'b', 'c', 'd', 'e'), 'a/b/c/d/e');
       expect(builder.join('a', 'b', 'c', 'd', 'e', 'f'), 'a/b/c/d/e/f');
       expect(builder.join('a', 'b', 'c', 'd', 'e', 'f', 'g'), 'a/b/c/d/e/f/g');
       expect(builder.join('a', 'b', 'c', 'd', 'e', 'f', 'g', 'h'),
           'a/b/c/d/e/f/g/h');
     });
 
     test('does not add separator if a part ends in one', () {
       expect(builder.join('a/', 'b', 'c/', 'd'), 'a/b/c/d');
       expect(builder.join('a\\', 'b'), r'a\/b');
     });
 
     test('ignores parts before an absolute path', () {
+      expect(builder.join('a', 'http://dartlang.org', 'b', 'c'),
+          'http://dartlang.org/b/c');
+      expect(builder.join('a', 'file://', 'b', 'c'), 'file:///b/c');
       expect(builder.join('a', '/', 'b', 'c'), '/b/c');
+      expect(builder.join('a', '/b', 'http://dartlang.org/c', 'd'),
+          'http://dartlang.org/c/d');
+      expect(builder.join(
+              'a', 'http://google.com/b', 'http://dartlang.org/c', 'd'),
+          'http://dartlang.org/c/d');
       expect(builder.join('a', '/b', '/c', 'd'), '/c/d');
       expect(builder.join('a', r'c:\b', 'c', 'd'), r'a/c:\b/c/d');
       expect(builder.join('a', r'\\b', 'c', 'd'), r'a/\\b/c/d');
     });
 
+    test('preserves roots before a root-relative path', () {
+      expect(builder.join('http://dartlang.org', 'a', '/b', 'c'),
+          'http://dartlang.org/b/c');
+      expect(builder.join('file://', 'a', '/b', 'c'), 'file:///b/c');
+      expect(builder.join('file://', 'a', '/b', 'c', '/d'), 'file:///d');
+    });
+
     test('ignores trailing nulls', () {
       expect(builder.join('a', null), equals('a'));
       expect(builder.join('a', 'b', 'c', null, null), equals('a/b/c'));
     });
 
     test('disallows intermediate nulls', () {
       expect(() => builder.join('a', null, 'b'), throwsArgumentError);
       expect(() => builder.join(null, 'a'), throwsArgumentError);
     });
   });
 
   group('joinAll', () {
     test('allows more than eight parts', () {
       expect(builder.joinAll(['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i']),
           'a/b/c/d/e/f/g/h/i');
     });
 
-    test('does not add separator if a part ends in one', () {
-      expect(builder.joinAll(['a/', 'b', 'c/', 'd']), 'a/b/c/d');
-      expect(builder.joinAll(['a\\', 'b']), r'a\/b');
-    });
-
     test('ignores parts before an absolute path', () {
+      expect(builder.joinAll(['a', 'http://dartlang.org', 'b', 'c']),
+          'http://dartlang.org/b/c');
+      expect(builder.joinAll(['a', 'file://', 'b', 'c']), 'file:///b/c');
       expect(builder.joinAll(['a', '/', 'b', 'c']), '/b/c');
+      expect(builder.joinAll(['a', '/b', 'http://dartlang.org/c', 'd']),
+          'http://dartlang.org/c/d');
+      expect(builder.joinAll(
+              ['a', 'http://google.com/b', 'http://dartlang.org/c', 'd']),
+          'http://dartlang.org/c/d');
       expect(builder.joinAll(['a', '/b', '/c', 'd']), '/c/d');
       expect(builder.joinAll(['a', r'c:\b', 'c', 'd']), r'a/c:\b/c/d');
       expect(builder.joinAll(['a', r'\\b', 'c', 'd']), r'a/\\b/c/d');
     });
+
+    test('preserves roots before a root-relative path', () {
+      expect(builder.joinAll(['http://dartlang.org', 'a', '/b', 'c']),
+          'http://dartlang.org/b/c');
+      expect(builder.joinAll(['file://', 'a', '/b', 'c']), 'file:///b/c');
+      expect(builder.joinAll(['file://', 'a', '/b', 'c', '/d']), 'file:///d');
+    });
   });
 
   group('split', () {
     test('simple cases', () {
       expect(builder.split(''), []);
       expect(builder.split('.'), ['.']);
       expect(builder.split('..'), ['..']);
       expect(builder.split('foo'), equals(['foo']));
       expect(builder.split('foo/bar.txt'), equals(['foo', 'bar.txt']));
       expect(builder.split('foo/bar/baz'), equals(['foo', 'bar', 'baz']));
       expect(builder.split('foo/../bar/./baz'),
           equals(['foo', '..', 'bar', '.', 'baz']));
       expect(builder.split('foo//bar///baz'), equals(['foo', 'bar', 'baz']));
       expect(builder.split('foo/\\/baz'), equals(['foo', '\\', 'baz']));
       expect(builder.split('.'), equals(['.']));
       expect(builder.split(''), equals([]));
       expect(builder.split('foo/'), equals(['foo']));
+      expect(builder.split('http://dartlang.org//'),
+          equals(['http://dartlang.org']));
+      expect(builder.split('file:////'), equals(['file://']));
       expect(builder.split('//'), equals(['/']));
     });
 
     test('includes the root for absolute paths', () {
+      expect(builder.split('http://dartlang.org/foo/bar/baz'),
+          equals(['http://dartlang.org', 'foo', 'bar', 'baz']));
+      expect(builder.split('file:///foo/bar/baz'),
+          equals(['file://', 'foo', 'bar', 'baz']));
       expect(builder.split('/foo/bar/baz'), equals(['/', 'foo', 'bar', 'baz']));
+      expect(builder.split('http://dartlang.org/'),
+          equals(['http://dartlang.org']));
+      expect(builder.split('http://dartlang.org'),
+          equals(['http://dartlang.org']));
+      expect(builder.split('file:///'), equals(['file://']));
+      expect(builder.split('file://'), equals(['file://']));
       expect(builder.split('/'), equals(['/']));
     });
   });
 
   group('normalize', () {
     test('simple cases', () {
       expect(builder.normalize(''), '');
       expect(builder.normalize('.'), '.');
       expect(builder.normalize('..'), '..');
       expect(builder.normalize('a'), 'a');
+      expect(builder.normalize('http://dartlang.org/'), 'http://dartlang.org');
+      expect(builder.normalize('http://dartlang.org'), 'http://dartlang.org');
+      expect(builder.normalize('file://'), 'file://');
+      expect(builder.normalize('file:///'), 'file://');
       expect(builder.normalize('/'), '/');
       expect(builder.normalize(r'\'), r'\');
     });
 
     test('collapses redundant separators', () {
       expect(builder.normalize(r'a/b/c'), r'a/b/c');
       expect(builder.normalize(r'a//b///c////d'), r'a/b/c/d');
     });
 
     test('does not collapse separators for other platform', () {
       expect(builder.normalize(r'a\\b\\\c'), r'a\\b\\\c');
     });
 
     test('eliminates "." parts', () {
       expect(builder.normalize('./'), '.');
+      expect(builder.normalize('http://dartlang.org/.'), 'http://dartlang.org');
+      expect(builder.normalize('file:///.'), 'file://');
       expect(builder.normalize('/.'), '/');
+      expect(builder.normalize('http://dartlang.org/./'),
+          'http://dartlang.org');
+      expect(builder.normalize('file:///./'), 'file://');
       expect(builder.normalize('/./'), '/');
       expect(builder.normalize('./.'), '.');
       expect(builder.normalize('a/./b'), 'a/b');
       expect(builder.normalize('a/.b/c'), 'a/.b/c');
       expect(builder.normalize('a/././b/./c'), 'a/b/c');
       expect(builder.normalize('././a'), 'a');
       expect(builder.normalize('a/./.'), 'a');
     });
 
     test('eliminates ".." parts', () {
       expect(builder.normalize('..'), '..');
       expect(builder.normalize('../'), '..');
       expect(builder.normalize('../../..'), '../../..');
       expect(builder.normalize('../../../'), '../../..');
+      expect(builder.normalize('http://dartlang.org/..'),
+          'http://dartlang.org');
+      expect(builder.normalize('file:///..'), 'file://');
       expect(builder.normalize('/..'), '/');
+      expect(builder.normalize('http://dartlang.org/../../..'),
+          'http://dartlang.org');
+      expect(builder.normalize('file:///../../..'), 'file://');
       expect(builder.normalize('/../../..'), '/');
+      expect(builder.normalize('http://dartlang.org/../../../a'),
+          'http://dartlang.org/a');
+      expect(builder.normalize('file:///../../../a'), 'file:///a');
       expect(builder.normalize('/../../../a'), '/a');
       expect(builder.normalize('a/..'), '.');
       expect(builder.normalize('a/b/..'), 'a');
       expect(builder.normalize('a/../b'), 'b');
       expect(builder.normalize('a/./../b'), 'b');
       expect(builder.normalize('a/b/c/../../d/e/..'), 'a/d');
       expect(builder.normalize('a/b/../../../../c'), '../../c');
     });
 
     test('does not walk before root on absolute paths', () {
       expect(builder.normalize('..'), '..');
       expect(builder.normalize('../'), '..');
+      expect(builder.normalize('http://dartlang.org/..'),
+          'http://dartlang.org');
+      expect(builder.normalize('file:///..'), 'file://');
       expect(builder.normalize('/..'), '/');
       expect(builder.normalize('a/..'), '.');
       expect(builder.normalize('a/b/..'), 'a');
       expect(builder.normalize('a/../b'), 'b');
       expect(builder.normalize('a/./../b'), 'b');
       expect(builder.normalize('a/b/c/../../d/e/..'), 'a/d');
       expect(builder.normalize('a/b/../../../../c'), '../../c');
     });
 
     test('removes trailing separators', () {
       expect(builder.normalize('./'), '.');
       expect(builder.normalize('.//'), '.');
       expect(builder.normalize('a/'), 'a');
       expect(builder.normalize('a/b/'), 'a/b');
       expect(builder.normalize('a/b///'), 'a/b');
     });
   });
 
   group('relative', () {
     group('from absolute root', () {
       test('given absolute path in root', () {
+        expect(builder.relative('http://dartlang.org'), '../..');
+        expect(builder.relative('http://dartlang.org/'), '../..');
         expect(builder.relative('/'), '../..');
+        expect(builder.relative('http://dartlang.org/root'), '..');
         expect(builder.relative('/root'), '..');
+        expect(builder.relative('http://dartlang.org/root/path'), '.');
         expect(builder.relative('/root/path'), '.');
+        expect(builder.relative('http://dartlang.org/root/path/a'), 'a');
         expect(builder.relative('/root/path/a'), 'a');
+        expect(builder.relative('http://dartlang.org/root/path/a/b.txt'),
+            'a/b.txt');
         expect(builder.relative('/root/path/a/b.txt'), 'a/b.txt');
+        expect(builder.relative('http://dartlang.org/root/a/b.txt'),
+            '../a/b.txt');
         expect(builder.relative('/root/a/b.txt'), '../a/b.txt');
       });
 
       test('given absolute path outside of root', () {
+        expect(builder.relative('http://dartlang.org/a/b'), '../../a/b');
         expect(builder.relative('/a/b'), '../../a/b');
+        expect(builder.relative('http://dartlang.org/root/path/a'), 'a');
         expect(builder.relative('/root/path/a'), 'a');
-        expect(builder.relative('/root/path/a/b.txt'), 'a/b.txt');
-        expect(builder.relative('/root/a/b.txt'), '../a/b.txt');
+        expect(builder.relative('http://dartlang.org/root/path/a/b.txt'),
+            'a/b.txt');
+        expect(builder.relative('http://dartlang.org/root/path/a/b.txt'),
+            'a/b.txt');
+        expect(builder.relative('http://dartlang.org/root/a/b.txt'),
+            '../a/b.txt');
+      });
+
+      test('given absolute path with different hostname/protocol', () {
+        expect(builder.relative(r'http://google.com/a/b'),
+            r'http://google.com/a/b');
+        expect(builder.relative(r'file:///a/b'),
+            r'file:///a/b');
       });
 
       test('given relative path', () {
         // The path is considered relative to the root, so it basically just
         // normalizes.
         expect(builder.relative(''), '.');
         expect(builder.relative('.'), '.');
         expect(builder.relative('a'), 'a');
         expect(builder.relative('a/b.txt'), 'a/b.txt');
         expect(builder.relative('../a/b.txt'), '../a/b.txt');
         expect(builder.relative('a/./b/../c.txt'), 'a/c.txt');
       });
     });
 
     group('from relative root', () {
-      var r = new path.Builder(style: path.Style.posix, root: 'foo/bar');
+      var r = new path.Builder(style: path.Style.url, root: 'foo/bar');
 
       test('given absolute path', () {
+        expect(r.relative('http://google.com/'), equals('http://google.com'));
+        expect(r.relative('http://google.com'), equals('http://google.com'));
+        expect(r.relative('file:///'), equals('file://'));
+        expect(r.relative('file://'), equals('file://'));
         expect(r.relative('/'), equals('/'));
         expect(r.relative('/a/b'), equals('/a/b'));
       });
 
       test('given relative path', () {
         // The path is considered relative to the root, so it basically just
         // normalizes.
         expect(r.relative(''), '.');
         expect(r.relative('.'), '.');
         expect(r.relative('..'), '..');
         expect(r.relative('a'), 'a');
         expect(r.relative('a/b.txt'), 'a/b.txt');
         expect(r.relative('../a/b.txt'), '../a/b.txt');
         expect(r.relative('a/./b/../c.txt'), 'a/c.txt');
       });
     });
 
+    group('from root-relative root', () {
+      var r = new path.Builder(style: path.Style.url, root: '/foo/bar');
+
+      test('given absolute path', () {
+        expect(r.relative('http://google.com/'), equals('http://google.com'));
+        expect(r.relative('http://google.com'), equals('http://google.com'));
+        expect(r.relative('file:///'), equals('file://'));
+        expect(r.relative('file://'), equals('file://'));
+        expect(r.relative('/'), equals('../..'));
+        expect(r.relative('/a/b'), equals('../../a/b'));
+      });
+
+      test('given relative path', () {
+        // The path is considered relative to the root, so it basically just
+        // normalizes.
+        expect(r.relative(''), '.');
+        expect(r.relative('.'), '.');
+        expect(r.relative('..'), '..');
+        expect(r.relative('a'), 'a');
+        expect(r.relative('a/b.txt'), 'a/b.txt');
+        expect(r.relative('../a/b.txt'), '../a/b.txt');
+        expect(r.relative('a/./b/../c.txt'), 'a/c.txt');
+      });
+    });
+
     test('from a root with extension', () {
-      var r = new path.Builder(style: path.Style.posix, root: '/dir.ext');
+      var r = new path.Builder(style: path.Style.url, root: '/dir.ext');
       expect(r.relative('/dir.ext/file'), 'file');
     });
 
     test('with a root parameter', () {
       expect(builder.relative('/foo/bar/baz', from: '/foo/bar'), equals('baz'));
+      expect(
+          builder.relative('/foo/bar/baz', from: 'http://dartlang.org/foo/bar'),
+          equals('baz'));
+      expect(
+          builder.relative('http://dartlang.org/foo/bar/baz', from: '/foo/bar'),
+          equals('baz'));
+      expect(builder.relative('http://dartlang.org/foo/bar/baz',
+              from: 'file:///foo/bar'),
+          equals('http://dartlang.org/foo/bar/baz'));
+      expect(builder.relative('http://dartlang.org/foo/bar/baz',
+          from: 'http://dartlang.org/foo/bar'), equals('baz'));
+      expect(
+          builder.relative('/foo/bar/baz', from: 'file:///foo/bar'),
+          equals('http://dartlang.org/foo/bar/baz'));
+      expect(
+          builder.relative('file:///foo/bar/baz', from: '/foo/bar'),
+          equals('file:///foo/bar/baz'));
+
       expect(builder.relative('..', from: '/foo/bar'), equals('../../root'));
+      expect(builder.relative('..', from: 'http://dartlang.org/foo/bar'),
+          equals('../../root'));
+      expect(builder.relative('..', from: 'file:///foo/bar'),
+          equals('http://dartlang.org/root'));
+      expect(builder.relative('..', from: '/foo/bar'), equals('../../root'));
+
+      expect(builder.relative('http://dartlang.org/foo/bar/baz',
+              from: 'foo/bar'),
+          equals('../../../../foo/bar/baz'));
+      expect(builder.relative('file:///foo/bar/baz', from: 'foo/bar'),
+          equals('file:///foo/bar/baz'));
       expect(builder.relative('/foo/bar/baz', from: 'foo/bar'),
           equals('../../../../foo/bar/baz'));
+
       expect(builder.relative('..', from: 'foo/bar'), equals('../../..'));
     });
 
     test('with a root parameter and a relative root', () {
-      var r = new path.Builder(style: path.Style.posix, root: 'relative/root');
+      var r = new path.Builder(style: path.Style.url, root: 'relative/root');
       expect(r.relative('/foo/bar/baz', from: '/foo/bar'), equals('baz'));
-      expect(() => r.relative('..', from: '/foo/bar'), throwsArgumentError);
+      expect(
+          r.relative('/foo/bar/baz', from: 'http://dartlang.org/foo/bar'),
+          equals('/foo/bar/baz'));
+      expect(
+          r.relative('http://dartlang.org/foo/bar/baz', from: '/foo/bar'),
+          equals('http://dartlang.org/foo/bar/baz'));
+      expect(r.relative('http://dartlang.org/foo/bar/baz',
+              from: 'file:///foo/bar'),
+          equals('http://dartlang.org/foo/bar/baz'));
+      expect(r.relative('http://dartlang.org/foo/bar/baz',
+          from: 'http://dartlang.org/foo/bar'), equals('baz'));
+
+      expect(r.relative('http://dartlang.org/foo/bar/baz', from: 'foo/bar'),
+          equals('http://dartlang.org/foo/bar/baz'));
+      expect(r.relative('file:///foo/bar/baz', from: 'foo/bar'),
+          equals('file:///foo/bar/baz'));
       expect(r.relative('/foo/bar/baz', from: 'foo/bar'),
           equals('/foo/bar/baz'));
+
       expect(r.relative('..', from: 'foo/bar'), equals('../../..'));
     });
   });
 
   group('resolve', () {
     test('allows up to seven parts', () {
-      expect(builder.resolve('a'), '/root/path/a');
-      expect(builder.resolve('a', 'b'), '/root/path/a/b');
-      expect(builder.resolve('a', 'b', 'c'), '/root/path/a/b/c');
-      expect(builder.resolve('a', 'b', 'c', 'd'), '/root/path/a/b/c/d');
-      expect(builder.resolve('a', 'b', 'c', 'd', 'e'), '/root/path/a/b/c/d/e');
+      expect(builder.resolve('a'), 'http://dartlang.org/root/path/a');
+      expect(builder.resolve('a', 'b'), 'http://dartlang.org/root/path/a/b');
+      expect(builder.resolve('a', 'b', 'c'),
+          'http://dartlang.org/root/path/a/b/c');
+      expect(builder.resolve('a', 'b', 'c', 'd'),
+          'http://dartlang.org/root/path/a/b/c/d');
+      expect(builder.resolve('a', 'b', 'c', 'd', 'e'),
+          'http://dartlang.org/root/path/a/b/c/d/e');
       expect(builder.resolve('a', 'b', 'c', 'd', 'e', 'f'),
-          '/root/path/a/b/c/d/e/f');
+          'http://dartlang.org/root/path/a/b/c/d/e/f');
       expect(builder.resolve('a', 'b', 'c', 'd', 'e', 'f', 'g'),
-          '/root/path/a/b/c/d/e/f/g');
+          'http://dartlang.org/root/path/a/b/c/d/e/f/g');
     });
 
     test('does not add separator if a part ends in one', () {
-      expect(builder.resolve('a/', 'b', 'c/', 'd'), '/root/path/a/b/c/d');
-      expect(builder.resolve(r'a\', 'b'), r'/root/path/a\/b');
+      expect(builder.resolve('a/', 'b', 'c/', 'd'),
+          'http://dartlang.org/root/path/a/b/c/d');
+      expect(builder.resolve(r'a\', 'b'),
+          r'http://dartlang.org/root/path/a\/b');
     });
 
     test('ignores parts before an absolute path', () {
-      expect(builder.resolve('a', '/b', '/c', 'd'), '/c/d');
-      expect(builder.resolve('a', r'c:\b', 'c', 'd'), r'/root/path/a/c:\b/c/d');
-      expect(builder.resolve('a', r'\\b', 'c', 'd'), r'/root/path/a/\\b/c/d');
+      expect(builder.resolve('a', '/b', '/c', 'd'), 'http://dartlang.org/c/d');
+      expect(builder.resolve('a', '/b', 'file:///c', 'd'), 'file:///c/d');
+      expect(builder.resolve('a', r'c:\b', 'c', 'd'),
+          r'http://dartlang.org/root/path/a/c:\b/c/d');
+      expect(builder.resolve('a', r'\\b', 'c', 'd'),
+          r'http://dartlang.org/root/path/a/\\b/c/d');
     });
   });
 
   test('withoutExtension', () {
     expect(builder.withoutExtension(''), '');
     expect(builder.withoutExtension('a'), 'a');
     expect(builder.withoutExtension('.a'), '.a');
     expect(builder.withoutExtension('a.b'), 'a');
     expect(builder.withoutExtension('a/b.c'), 'a/b');
     expect(builder.withoutExtension('a/b.c.d'), 'a/b.c');
     expect(builder.withoutExtension('a/'), 'a/');
     expect(builder.withoutExtension('a/b/'), 'a/b/');
     expect(builder.withoutExtension('a/.'), 'a/.');
     expect(builder.withoutExtension('a/.b'), 'a/.b');
     expect(builder.withoutExtension('a.b/c'), 'a.b/c');
     expect(builder.withoutExtension(r'a.b\c'), r'a');
     expect(builder.withoutExtension(r'a/b\c'), r'a/b\c');
     expect(builder.withoutExtension(r'a/b\c.d'), r'a/b\c');
     expect(builder.withoutExtension('a/b.c/'), 'a/b/');
     expect(builder.withoutExtension('a/b.c//'), 'a/b//');
   });
 }