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1 // Copyright (c) 2015, the Dart project authors. Please see the AUTHORS file | |
2 // for details. All rights reserved. Use of this source code is governed by a | |
3 // BSD-style license that can be found in the LICENSE file. | |
4 library package_config._util; | |
pquitslund
2015/05/21 18:14:23
Not sure if this is intentional. Should it be pac
Lasse Reichstein Nielsen
2015/05/21 18:30:22
Not sure what I was thinking. It should just be .u
| |
5 | |
6 import "package:charcode/ascii.dart"; | |
7 | |
8 /// Tests whether something is a valid Dart identifier/package name. | |
9 bool isIdentifier(String string) { | |
10 if (string.isEmpty) return false; | |
11 int firstChar = string.codeUnitAt(0); | |
12 int firstCharLower = firstChar |= 0x20; | |
13 if (firstCharLower < $a || firstCharLower > $z) { | |
14 if (firstChar != $_ && firstChar != $$) return false; | |
15 } | |
16 for (int i = 1; i < string.length; i++) { | |
17 int char = string.codeUnitAt(i); | |
18 int charLower = char | 0x20; | |
19 if (charLower < $a || charLower > $z) { // Letters. | |
20 if ((char ^ 0x30) <= 9) continue; // Digits. | |
21 if (char == $_ || char == $$) continue; // $ and _ | |
22 if (firstChar != $_ && firstChar != $$) return false; | |
23 } | |
24 } | |
25 return true; | |
26 } | |
27 | |
28 | |
29 /// Validate that a Uri is a valid package:URI. | |
30 String checkValidPackageUri(Uri packageUri) { | |
31 if (packageUri.scheme != "package") { | |
32 throw new ArgumentError.value(packageUri, "packageUri", | |
33 "Not a package: URI"); | |
34 } | |
35 if (packageUri.hasAuthority) { | |
36 throw new ArgumentError.value(packageUri, "packageUri", | |
37 "Package URIs must not have a host part"); | |
38 } | |
39 if (packageUri.hasQuery) { | |
40 // A query makes no sense if resolved to a file: URI. | |
41 throw new ArgumentError.value(packageUri, "packageUri", | |
42 "Package URIs must not have a query part"); | |
43 } | |
44 if (packageUri.hasFragment) { | |
45 // We could leave the fragment after the URL when resolving, | |
46 // but it would be odd if "package:foo/foo.dart#1" and | |
47 // "package:foo/foo.dart#2" were considered different libraries. | |
48 // Keep the syntax open in case we ever get multiple libraries in one file. | |
49 throw new ArgumentError.value(packageUri, "packageUri", | |
50 "Package URIs must not have a fragment part"); | |
51 } | |
52 if (packageUri.path.startsWith('/')) { | |
53 throw new ArgumentError.value(packageUri, "packageUri", | |
54 "Package URIs must not start with a '/'"); | |
55 } | |
56 int firstSlash = packageUri.path.indexOf('/'); | |
57 if (firstSlash == -1) { | |
58 throw new ArgumentError.value(packageUri, "packageUri", | |
59 "Package URIs must start with the package name followed by a '/'"); | |
60 } | |
61 String packageName = packageUri.path.substring(0, firstSlash); | |
62 if (!isIdentifier(packageName)) { | |
63 throw new ArgumentError.value(packageUri, "packageUri", | |
64 "Package names must be valid identifiers"); | |
65 } | |
66 return packageName; | |
67 } | |
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