Roll Observatory packages and add a roll script

charted/lib/core/text_metrics/segmentation.dart

-//
-// 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
-//
-
-library charted.core.text_metrics.segmentation;
-
-import "package:charted/core/text_metrics/segmentation_utils.dart";
-import "package:charted/core/text_metrics/segmentation_data.dart";
-
-/// Current unicode version.
-/// Character database available at http://www.unicode.org/Public/7.0.0/ucd/
-const UNICODE_VERSION = '7.0.0';
-
-// Code table based on:
-// http://www.unicode.org/Public/7.0.0/ucd/auxiliary/GraphemeBreakTest.html
-// GRAPHEME_BREAK_TABLE[prevType * TYPE_COUNT + curType] == 1 means break.
-const GRAPHEME_BREAK_TABLE = const[
-    1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1,
-    1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1,
-    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
-    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
-    1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1,
-    1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1,
-    1, 1, 1, 1, 0, 0, 0, 0, 1, 0, 0, 1,
-    1, 1, 1, 1, 0, 0, 1, 0, 0, 1, 1, 1,
-    1, 1, 1, 1, 0, 0, 1, 1, 0, 1, 1, 1,
-    1, 1, 1, 1, 0, 0, 1, 0, 0, 1, 1, 1,
-    1, 1, 1, 1, 0, 0, 1, 1, 0, 1, 1, 1,
-    1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 0
-];
-
-/// Get type of a given char code.
-int _typeForRune(int rune) {
-  int count = CODE_POINT_BLOCKS.length ~/ 3;
-  int min = 0;
-  int max = count - 1;
-  while (max >= min) {
-    int mid = (max + min) ~/ 2;
-    int idx = mid * 3;
-    if (CODE_POINT_BLOCKS[idx] <= rune && rune <= CODE_POINT_BLOCKS[idx+1]) {
-      return CODE_POINT_BLOCKS[idx+2]; // Return the found character type
-    }
-    if (CODE_POINT_BLOCKS[idx] > rune) {
-      max = mid - 1;
-    }
-    else if (CODE_POINT_BLOCKS[idx+1] < rune) {
-      min = max + 1;
-    }
-  }
-  return CODE_CATEGORY_OTHER; // Defaults to OTHER.
-}
-
-Iterable<int> graphemeBreakIndices(String s) {
-  List<int> indices = [];
-  int previousType = 0;
-  for (var iter = s.runes.iterator; iter.moveNext();) {
-    int currentType = _typeForRune(iter.current);
-    if (GRAPHEME_BREAK_TABLE[previousType * 12 + currentType] == 1) {
-      indices.add(iter.rawIndex);
-    }
-    previousType = currentType;
-  }
-  return indices;
-}