Roll Observatory packages and add a roll script

package_config/lib/packages_file.dart

Index: package_config/lib/packages_file.dart
diff --git a/package_config/lib/packages_file.dart b/package_config/lib/packages_file.dart
deleted file mode 100644
index f30781dc3fb3b0a076e2990451e48e41114fa8e9..0000000000000000000000000000000000000000
--- a/package_config/lib/packages_file.dart
+++ /dev/null
@@ -1,190 +0,0 @@
-// 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.
-
-library package_config.packages_file;
-
-import "package:charcode/ascii.dart";
-import "src/util.dart" show isValidPackageName;
-
-/// Parses a `.packages` file into a map from package name to base URI.
-///
-/// The [source] is the byte content of a `.packages` file, assumed to be
-/// UTF-8 encoded. In practice, all significant parts of the file must be ASCII,
-/// so Latin-1 or Windows-1252 encoding will also work fine.
-///
-/// If the file content is available as a string, its [String.codeUnits] can
-/// be used as the `source` argument of this function.
-///
-/// The [baseLocation] is used as a base URI to resolve all relative
-/// URI references against.
-/// If the content was read from a file, `baseLocation` should be the
-/// location of that file.
-///
-/// Returns a simple mapping from package name to package location.
-Map<String, Uri> parse(List<int> source, Uri baseLocation) {
-  int index = 0;
-  Map<String, Uri> result = <String, Uri>{};
-  while (index < source.length) {
-    bool isComment = false;
-    int start = index;
-    int separatorIndex = -1;
-    int end = source.length;
-    int char = source[index++];
-    if (char == $cr || char == $lf) {
-      continue;
-    }
-    if (char == $colon) {
-      throw new FormatException("Missing package name", source, index - 1);
-    }
-    isComment = char == $hash;
-    while (index < source.length) {
-      char = source[index++];
-      if (char == $colon && separatorIndex < 0) {
-        separatorIndex = index - 1;
-      } else if (char == $cr || char == $lf) {
-        end = index - 1;
-        break;
-      }
-    }
-    if (isComment) continue;
-    if (separatorIndex < 0) {
-      throw new FormatException("No ':' on line", source, index - 1);
-    }
-    var packageName = new String.fromCharCodes(source, start, separatorIndex);
-    if (!isValidPackageName(packageName)) {
-      throw new FormatException("Not a valid package name", packageName, 0);
-    }
-    var packageUri = new String.fromCharCodes(source, separatorIndex + 1, end);
-    var packageLocation = Uri.parse(packageUri);
-    packageLocation = baseLocation.resolveUri(packageLocation);
-    if (!packageLocation.path.endsWith('/')) {
-      packageLocation =
-          packageLocation.replace(path: packageLocation.path + "/");
-    }
-    if (result.containsKey(packageName)) {
-      throw new FormatException(
-          "Same package name occured twice.", source, start);
-    }
-    result[packageName] = packageLocation;
-  }
-  return result;
-}
-
-/// Writes the mapping to a [StringSink].
-///
-/// If [comment] is provided, the output will contain this comment
-/// with `# ` in front of each line.
-/// Lines are defined as ending in line feed (`'\n'`). If the final
-/// line of the comment doesn't end in a line feed, one will be added.
-///
-/// If [baseUri] is provided, package locations will be made relative
-/// to the base URI, if possible, before writing.
-///
-/// All the keys of [packageMapping] must be valid package names,
-/// and the values must be URIs that do not have the `package:` scheme.
-void write(StringSink output, Map<String, Uri> packageMapping,
-           {Uri baseUri, String comment}) {
-  if (baseUri != null && !baseUri.isAbsolute) {
-    throw new ArgumentError.value(baseUri, "baseUri", "Must be absolute");
-  }
-
-  if (comment != null) {
-    var lines = comment.split('\n');
-    if (lines.last.isEmpty) lines.removeLast();
-    for (var commentLine in lines) {
-      output.write('# ');
-      output.writeln(commentLine);
-    }
-  } else {
-    output.write("# generated by package:package_config at ");
-    output.write(new DateTime.now());
-    output.writeln();
-  }
-
-  packageMapping.forEach((String packageName, Uri uri) {
-    // Validate packageName.
-    if (!isValidPackageName(packageName)) {
-      throw new ArgumentError('"$packageName" is not a valid package name');
-    }
-    if (uri.scheme == "package") {
-      throw new ArgumentError.value(
-          "Package location must not be a package: URI", uri.toString());
-    }
-    output.write(packageName);
-    output.write(':');
-    // If baseUri provided, make uri relative.
-    if (baseUri != null) {
-      uri = _relativize(uri, baseUri);
-    }
-    output.write(uri);
-    if (!uri.path.endsWith('/')) {
-      output.write('/');
-    }
-    output.writeln();
-  });
-}
-
-/// Attempts to return a relative URI for [uri].
-///
-/// The result URI satisfies `baseUri.resolveUri(result) == uri`,
-/// but may be relative.
-/// The `baseUri` must be absolute.
-Uri _relativize(Uri uri, Uri baseUri) {
-  assert(baseUri.isAbsolute);
-  if (uri.hasQuery || uri.hasFragment) {
-    uri = new Uri(
-        scheme: uri.scheme,
-        userInfo: uri.hasAuthority ? uri.userInfo : null,
-        host: uri.hasAuthority ? uri.host : null,
-        port: uri.hasAuthority ? uri.port : null,
-        path: uri.path);
-  }
-
-  // Already relative. We assume the caller knows what they are doing.
-  if (!uri.isAbsolute) return uri;
-
-  if (baseUri.scheme != uri.scheme) {
-    return uri;
-  }
-
-  // If authority differs, we could remove the scheme, but it's not worth it.
-  if (uri.hasAuthority != baseUri.hasAuthority) return uri;
-  if (uri.hasAuthority) {
-    if (uri.userInfo != baseUri.userInfo ||
-        uri.host.toLowerCase() != baseUri.host.toLowerCase() ||
-        uri.port != baseUri.port) {
-      return uri;
-    }
-  }
-
-  baseUri = _normalizePath(baseUri);
-  List<String> base = baseUri.pathSegments.toList();
-  if (base.isNotEmpty) {
-    base = new List<String>.from(base)..removeLast();
-  }
-  uri = _normalizePath(uri);
-  List<String> target = uri.pathSegments.toList();
-  if (target.isNotEmpty && target.last.isEmpty) target.removeLast();
-  int index = 0;
-  while (index < base.length && index < target.length) {
-    if (base[index] != target[index]) {
-      break;
-    }
-    index++;
-  }
-  if (index == base.length) {
-    if (index == target.length) {
-      return new Uri(path: "./");
-    }
-    return new Uri(path: target.skip(index).join('/'));
-  } else if (index > 0) {
-    return new Uri(
-        path: '../' * (base.length - index) + target.skip(index).join('/'));
-  } else {
-    return uri;
-  }
-}
-
-// TODO: inline to uri.normalizePath() when we move to 1.11
-Uri _normalizePath(Uri uri) => new Uri().resolveUri(uri);