| // 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. |
| |
| /// Utility methods used by more than one library in the package. |
| library package_config.util; |
| |
| import "package:charcode/ascii.dart"; |
| |
| /// Tests whether something is a valid Dart identifier/package name. |
| bool isIdentifier(String string) { |
| if (string.isEmpty) return false; |
| int firstChar = string.codeUnitAt(0); |
| int firstCharLower = firstChar | 0x20; |
| if (firstCharLower < $a || firstCharLower > $z) { |
| if (firstChar != $_ && firstChar != $$) return false; |
| } |
| for (int i = 1; i < string.length; i++) { |
| int char = string.codeUnitAt(i); |
| int charLower = char | 0x20; |
| if (charLower < $a || charLower > $z) { // Letters. |
| if ((char ^ 0x30) <= 9) continue; // Digits. |
| if (char == $_ || char == $$) continue; // $ and _ |
| if (firstChar != $_ && firstChar != $$) return false; |
| } |
| } |
| return true; |
| } |
| |
| |
| /// Validate that a Uri is a valid package:URI. |
| String checkValidPackageUri(Uri packageUri) { |
| if (packageUri.scheme != "package") { |
| throw new ArgumentError.value(packageUri, "packageUri", |
| "Not a package: URI"); |
| } |
| if (packageUri.hasAuthority) { |
| throw new ArgumentError.value(packageUri, "packageUri", |
| "Package URIs must not have a host part"); |
| } |
| if (packageUri.hasQuery) { |
| // A query makes no sense if resolved to a file: URI. |
| throw new ArgumentError.value(packageUri, "packageUri", |
| "Package URIs must not have a query part"); |
| } |
| if (packageUri.hasFragment) { |
| // We could leave the fragment after the URL when resolving, |
| // but it would be odd if "package:foo/foo.dart#1" and |
| // "package:foo/foo.dart#2" were considered different libraries. |
| // Keep the syntax open in case we ever get multiple libraries in one file. |
| throw new ArgumentError.value(packageUri, "packageUri", |
| "Package URIs must not have a fragment part"); |
| } |
| if (packageUri.path.startsWith('/')) { |
| throw new ArgumentError.value(packageUri, "packageUri", |
| "Package URIs must not start with a '/'"); |
| } |
| int firstSlash = packageUri.path.indexOf('/'); |
| if (firstSlash == -1) { |
| throw new ArgumentError.value(packageUri, "packageUri", |
| "Package URIs must start with the package name followed by a '/'"); |
| } |
| String packageName = packageUri.path.substring(0, firstSlash); |
| if (!isIdentifier(packageName)) { |
| throw new ArgumentError.value(packageUri, "packageUri", |
| "Package names must be valid identifiers"); |
| } |
| return packageName; |
| } |