Move Arrays class to private library.

sdk/lib/collection/arrays.dart

-// Copyright (c) 2012, 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.
-
-part of dart.collection;
-
-// TODO(ngeoffray): Rename to Lists.
-class Arrays {
-  static void copy(List src, int srcStart,
-                   List dst, int dstStart, int count) {
-    if (srcStart == null) srcStart = 0;
-    if (dstStart == null) dstStart = 0;
-
-    if (srcStart < dstStart) {
-      for (int i = srcStart + count - 1, j = dstStart + count - 1;
-           i >= srcStart; i--, j--) {
-        dst[j] = src[i];
-      }
-    } else {
-      for (int i = srcStart, j = dstStart; i < srcStart + count; i++, j++) {
-        dst[j] = src[i];
-      }
-    }
-  }
-
-  static bool areEqual(List a, Object b) {
-    if (identical(a, b)) return true;
-    if (!(b is List)) return false;
-    int length = a.length;
-    if (length != b.length) return false;
-
-    for (int i = 0; i < length; i++) {
-      if (!identical(a[i], b[i])) return false;
-    }
-    return true;
-  }
-
-  /**
-   * Returns the index in the list [a] of the given [element], starting
-   * the search at index [startIndex] to [endIndex] (exclusive).
-   * Returns -1 if [element] is not found.
-   */
-  static int indexOf(List a,
-                     Object element,
-                     int startIndex,
-                     int endIndex) {
-    if (startIndex >= a.length) {
-      return -1;
-    }
-    if (startIndex < 0) {
-      startIndex = 0;
-    }
-    for (int i = startIndex; i < endIndex; i++) {
-      if (a[i] == element) {
-        return i;
-      }
-    }
-    return -1;
-  }
-
-  /**
-   * Returns the last index in the list [a] of the given [element], starting
-   * the search at index [startIndex] to 0.
-   * Returns -1 if [element] is not found.
-   */
-  static int lastIndexOf(List a, Object element, int startIndex) {
-    if (startIndex < 0) {
-      return -1;
-    }
-    if (startIndex >= a.length) {
-      startIndex = a.length - 1;
-    }
-    for (int i = startIndex; i >= 0; i--) {
-      if (a[i] == element) {
-        return i;
-      }
-    }
-    return -1;
-  }
-
-  static void rangeCheck(List a, int start, int length) {
-    if (length < 0) {
-      throw new ArgumentError("negative length $length");
-    }
-    if (start < 0 ) {
-      String message = "$start must be greater than or equal to 0";
-      throw new RangeError(message);
-    }
-    if (start + length > a.length) {
-      String message = "$start + $length must be in the range [0..${a.length})";
-      throw new RangeError(message);
-    }
-  }
-}