Roll Observatory packages and add a roll script

charted/lib/core/text_metrics.dart

Index: charted/lib/core/text_metrics.dart
diff --git a/charted/lib/core/text_metrics.dart b/charted/lib/core/text_metrics.dart
deleted file mode 100644
index 59335947249dcf8d388fd5411fbb853c091f8aef..0000000000000000000000000000000000000000
--- a/charted/lib/core/text_metrics.dart
+++ /dev/null
@@ -1,113 +0,0 @@
-//
-// 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
-//
-
-/// Provides a way to measure rendered text width for clipping
-/// text on tooltips and ticks when they are too long.
-library charted.core.text_metrics;
-
-import "dart:html";
-import "package:charted/core/text_metrics/segmentation.dart";
-
-/// Utilities to measure text width.
-class TextMetrics {
-  static CanvasElement canvas;
-  static CanvasRenderingContext2D context;
-  static TextMetrics instance;
-
-  static const MAX_STRING_LENGTH = 250;
-  static final FONT_SIZE_REGEX = new RegExp("\s?([0-9]+)px\s?");
-
-  final String fontStyle;
-  int fontSize = 16;
-
-  String currentFontStyle;
-
-  factory TextMetrics({String fontStyle}) {
-    if (canvas == null || context == null) {
-      canvas = document.createElement('canvas');
-      context = canvas.getContext('2d');
-    }
-    if (instance == null) {
-      instance = new TextMetrics._internal(fontStyle);
-    }
-    return instance;
-  }
-  TextMetrics._internal(this.fontStyle) {
-    Match match = FONT_SIZE_REGEX.firstMatch(fontStyle);
-    fontSize = int.parse(match.group(1));
-  }
-
-  void setFontStyle(String fontStyle) {
-    if (fontStyle == null) {
-      fontStyle = this.fontStyle;
-    }
-    if (currentFontStyle != fontStyle) {
-      context.font = fontStyle;
-      currentFontStyle = fontStyle;
-    }
-  }
-
-  /// Measure width of [text] in pixels.
-  /// Optionally, uses [fontStyle] instead of using the default style
-  double getTextWidth(String text, {String fontStyle}) {
-    assert(text.length <= MAX_STRING_LENGTH);
-    setFontStyle(fontStyle);
-    return context.measureText(text).width;
-  }
-
-  /// Gets length of the longest string in the given [strings].
-  /// Optionally, uses [fontStyle] instead of using the default style.
-  double getLongestTextWidth(Iterable<String> strings, {String fontStyle}) {
-    setFontStyle(fontStyle);
-    double maxWidth = 0.0;
-    for (int i = 0; i < strings.length; ++i) {
-      assert(strings.elementAt(i).length <= MAX_STRING_LENGTH);
-      double width = context.measureText(strings.elementAt(i)).width;
-      if (width > maxWidth) {
-        maxWidth = width;
-      }
-    }
-
-    return maxWidth;
-  }
-
-  /// Truncates given [text] to fit in [width]. Adds an ellipsis to the
-  /// returned string, if it needed to be truncated.
-  /// Optionally, uses [fontStyle] instead of using the default style.
-  String ellipsizeText(String text, double width, {String fontStyle}) {
-    assert(text.length <= MAX_STRING_LENGTH);
-    setFontStyle(fontStyle);
-    double computedWidth = context.measureText(text).width;
-    if (computedWidth > width) {
-      var indices = graphemeBreakIndices(text);
-      var position = 0,
-          min = 0, max = indices.length - 1, mid,
-          ellipsis = context.measureText('…').width;
-      width = width - ellipsis;
-      while (max >= min) {
-        mid = (min + max) ~/ 2;
-        position = indices[mid];
-        if (context.measureText(text.substring(0, position)).width > width) {
-          max = mid - 1;
-        } else {
-          min = mid + 1;
-        }
-      }
-      text = text.substring(0, indices[max]) + '…';
-    }
-    return text;
-  }
-
-  /// Truncates text in the given [element], which is either a [SvgTextElement]
-  /// or a [SvgTspanElement] to fit in [width]. Appends an ellipsis to the text
-  /// if it had to be truncated.
-  /// Calling this method may force a layout on the document. For better
-  /// performance, use [TextMetrics.ellipsizeText].
-  static ellipsizeTextElement() {
-  }
-}