Stop running pub get at gclient sync time and fix build bugs

mojo/public/dart/third_party/package_config/lib/src/util.dart

+// 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";
+
+// All ASCII characters that are valid in a package name, with space
+// for all the invalid ones (including space).
+const String _validPackageNameCharacters =
+    r"                                 !  $ &'()*+,-. 0123456789 ; =  "
+    r"@ABCDEFGHIJKLMNOPQRSTUVWXYZ    _ abcdefghijklmnopqrstuvwxyz   ~ ";
+
+/// Tests whether something is a valid Dart package name.
+bool isValidPackageName(String string) {
+  return _findInvalidCharacter(string) < 0;
+}
+
+/// Check if a string is a valid package name.
+///
+/// Valid package names contain only characters in [_validPackageNameCharacters]
+/// and must contain at least one non-'.' character.
+///
+/// Returns `-1` if the string is valid.
+/// Otherwise returns the index of the first invalid character,
+/// or `string.length` if the string contains no non-'.' character.
+int _findInvalidCharacter(String string) {
+  // Becomes non-zero if any non-'.' character is encountered.
+  int nonDot = 0;
+  for (int i = 0; i < string.length; i++) {
+    var c = string.codeUnitAt(i);
+    if (c > 0x7f || _validPackageNameCharacters.codeUnitAt(c) <= $space) {
+      return i;
+    }
+    nonDot += c ^ $dot;
+  }
+  if (nonDot == 0) return string.length;
+  return -1;
+}
+
+/// 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);
+  int badIndex = _findInvalidCharacter(packageName);
+  if (badIndex >= 0) {
+    if (packageName.isEmpty) {
+      throw new ArgumentError.value(packageUri, "packageUri",
+          "Package names mus be non-empty");
+    }
+    if (badIndex == packageName.length) {
+      throw new ArgumentError.value(packageUri, "packageUri",
+          "Package names must contain at least one non-'.' character");
+    }
+    assert(badIndex < packageName.length);
+    int badCharCode = packageName.codeUnitAt(badIndex);
+    var badChar = "U+" + badCharCode.toRadixString(16).padLeft(4, '0');
+    if (badCharCode >= 0x20 && badCharCode <= 0x7e) {
+      // Printable character.
+      badChar = "'${packageName[badIndex]}' ($badChar)";
+    }
+    throw new ArgumentError.value(packageUri, "packageUri",
+        "Package names must not contain $badChar");
+  }
+  return packageName;
+}