Index: pkg/path/lib/src/style.dart |
diff --git a/pkg/path/lib/src/style.dart b/pkg/path/lib/src/style.dart |
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+// Copyright (c) 2013, 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 path.style; |
+ |
+import 'context.dart'; |
+import 'style/posix.dart'; |
+import 'style/url.dart'; |
+import 'style/windows.dart'; |
+ |
+/// An enum type describing a "flavor" of path. |
+abstract 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 PosixStyle(); |
+ |
+ /// 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 WindowsStyle(); |
+ |
+ /// URLs aren't filesystem paths, but they're supported to make it easier to |
+ /// manipulate URL paths in the browser. |
+ /// |
+ /// URLs use "/" (forward slash) as separators. Absolute paths either start |
+ /// with a protocol and optional hostname (e.g. `http://dartlang.org`, |
+ /// `file://`) or with "/". |
+ static final url = new UrlStyle(); |
+ |
+ /// The style of the host platform. |
+ /// |
+ /// When running on the command line, this will be [windows] or [posix] based |
+ /// on the host operating system. On a browser, this will be [url]. |
+ static final platform = _getPlatformStyle(); |
+ |
+ /// Gets the type of the host platform. |
+ static Style _getPlatformStyle() { |
+ // If we're running a Dart file in the browser from a `file:` URI, |
+ // [Uri.base] will point to a file. If we're running on the standalone, |
+ // it will point to a directory. We can use that fact to determine which |
+ // style to use. |
+ if (Uri.base.scheme != 'file') return Style.url; |
+ if (!Uri.base.path.endsWith('/')) return Style.url; |
+ if (new Uri(path: 'a/b').toFilePath() == 'a\\b') return Style.windows; |
+ return Style.posix; |
+ } |
+ |
+ /// The name of this path style. Will be "posix" or "windows". |
+ String get name; |
+ |
+ /// The path separator for this style. On POSIX, this is `/`. On Windows, |
+ /// it's `\`. |
+ String get 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. |
+ Pattern get separatorPattern; |
+ |
+ /// The [Pattern] that matches path components that need a separator after |
+ /// them. |
+ /// |
+ /// Windows and POSIX styles just need separators when the previous component |
+ /// doesn't already end in a separator, but the URL always needs to place a |
+ /// separator between the root and the first component, even if the root |
+ /// already ends in a separator character. For example, to join "file://" and |
+ /// "usr", an additional "/" is needed (making "file:///usr"). |
+ Pattern get needsSeparatorPattern; |
+ |
+ /// The [Pattern] that can be used to match the root prefix of an absolute |
+ /// path in this style. |
+ Pattern get rootPattern; |
+ |
+ /// The [Pattern] that can be used to match the root prefix of a root-relative |
+ /// path in this style. |
+ /// |
+ /// This can be null to indicate that this style doesn't support root-relative |
+ /// paths. |
+ final Pattern relativeRootPattern = null; |
+ |
+ /// A [Context] that uses this style. |
+ Context get context => new Context(style: this); |
+ |
+ /// Gets the root prefix of [path] if path is absolute. If [path] is relative, |
+ /// returns `null`. |
+ String getRoot(String path) { |
+ // TODO(rnystrom): Use firstMatch() when #7080 is fixed. |
+ var matches = rootPattern.allMatches(path); |
+ if (matches.isNotEmpty) return matches.first[0]; |
+ return getRelativeRoot(path); |
+ } |
+ |
+ /// Gets the root prefix of [path] if it's root-relative. |
+ /// |
+ /// If [path] is relative or absolute and not root-relative, returns `null`. |
+ String getRelativeRoot(String path) { |
+ if (relativeRootPattern == null) return null; |
+ // TODO(rnystrom): Use firstMatch() when #7080 is fixed. |
+ var matches = relativeRootPattern.allMatches(path); |
+ if (matches.isEmpty) return null; |
+ return matches.first[0]; |
+ } |
+ |
+ /// Returns the path represented by [uri] in this style. |
+ String pathFromUri(Uri uri); |
+ |
+ /// Returns the URI that represents the relative path made of [parts]. |
+ Uri relativePathToUri(String path) => |
+ new Uri(pathSegments: context.split(path)); |
+ |
+ /// Returns the URI that represents [path], which is assumed to be absolute. |
+ Uri absolutePathToUri(String path); |
+ |
+ String toString() => name; |
+} |