Roll Observatory packages and add a roll script

charted/lib/charts/chart_data.dart

Index: charted/lib/charts/chart_data.dart
diff --git a/charted/lib/charts/chart_data.dart b/charted/lib/charts/chart_data.dart
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-//
-// Copyright 2014 Google Inc. All rights reserved.
-//
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file or at
-// https://developers.google.com/open-source/licenses/bsd
-//
-
-part of charted.charts;
-
-///
-/// Interface to be implemented by data providers to give tabular access to
-/// data for chart renderers.
-///
-abstract class ChartData {
-  /// Read-only access to column specs
-  Iterable<ChartColumnSpec> get columns;
-
-  /// Read-only access to rows
-  Iterable<Iterable> get rows;
-
-  /// Create a new instance of [ChartData]'s internal implementation
-  factory ChartData(
-      Iterable<ChartColumnSpec> columns, Iterable<Iterable> rows) = DefaultChartDataImpl;
-}
-
-///
-/// Interface implemented by [ChartData] transformers.
-/// Examples:
-///   [AggregationTransformer] to compute aggregated rows/columns
-///   [FilterTransformer] to filter data
-///   [TransposeTransformer] to convert rows to columns and vice-versa
-///
-abstract class ChartDataTransform {
-  /// Create a new instance of [ChartData] by selecting a subset
-  /// of rows and columns from the current one
-  ChartData transform(ChartData source);
-}
-
-
-///
-/// Implementation of [ChangeRecord], that is used to notify when rows get added
-/// or removed to ChartData
-///
-class ChartRowChangeRecord implements ChangeRecord {
-  /// Changes to the rows - contains all updates to rows since last notification.
-  final List<ListChangeRecord> changes;
-
-  const ChartRowChangeRecord(this.changes);
-}
-
-///
-/// Implementation of [ChangeRecord], that is used to notify changes to
-/// values in [ChartData].
-///
-class ChartValueChangeRecord implements ChangeRecord {
-  /// Row that changed.
-  final int row;
-
-  /// List of changes to data on the row - includes all updates since the
-  /// last change notification.
-  final List<ListChangeRecord> changes;
-
-  const ChartValueChangeRecord(this.row, this.changes);
-}
-
-///
-/// Meta information for each column in ChartData
-///
-class ChartColumnSpec {
-  static const String TYPE_BOOLEAN = 'boolean';
-  static const String TYPE_DATE = 'date';
-  static const String TYPE_NUMBER = 'number';
-  static const String TYPE_STRING = 'string';
-  static const String TYPE_TIMESTAMP = 'timestamp';
-
-  static const List ORDINAL_SCALES = const [ TYPE_STRING ];
-  static const List LINEAR_SCALES = const [ TYPE_NUMBER ];
-  static const List TIME_SCALES = const [ TYPE_DATE, TYPE_TIMESTAMP ];
-
-  /// Formatter for values that belong to this column
-  final FormatFunction formatter;
-
-  /// Label for the column.  Used in legend, tooltips etc;
-  /// When not specified, defaults to empty string.
-  final String label;
-
-  /// Type of data in this column. Used for interpolations, computing
-  /// scales and ranges. When not specified, it is assumed to be "number"
-  /// for measures and "string" for dimensions.
-  final String type;
-
-  /// Indicates if this column requires [OrdinalScale].
-  ///
-  /// If not specified, an ordinal scale is used for string columns and
-  /// quantitative scales are used for others.
-  final bool useOrdinalScale;
-
-  /// Initialize axis scale according to [ChartColumnSpec] type.
-  /// This logic is extracted from [ChartArea] implementation for conveniently
-  /// adding more scale types.
-  Scale createDefaultScale() {
-    if (useOrdinalScale == true) {
-      return new OrdinalScale();
-    }
-    else if (LINEAR_SCALES.contains(type)) {
-      return new LinearScale();
-    }
-    else if (TIME_SCALES.contains(type)) {
-      return new TimeScale();
-    }
-    return null;
-  }
-
-  ChartColumnSpec({this.label, String type : TYPE_NUMBER,
-      this.formatter, bool useOrdinalScale})
-      : useOrdinalScale =
-            useOrdinalScale == true ||
-            useOrdinalScale == null && ORDINAL_SCALES.contains(type),
-        type = type;
-}