Add a utility class needed by the scanner

editor/tools/plugins/com.google.dart.engine/src/com/google/dart/engine/utilities/collection/IntList.java

Index: editor/tools/plugins/com.google.dart.engine/src/com/google/dart/engine/utilities/collection/IntList.java
===================================================================
--- editor/tools/plugins/com.google.dart.engine/src/com/google/dart/engine/utilities/collection/IntList.java	(revision 0)
+++ editor/tools/plugins/com.google.dart.engine/src/com/google/dart/engine/utilities/collection/IntList.java	(revision 0)
@@ -0,0 +1,83 @@
+/*
+ * Copyright (c) 2012, the Dart project authors.
+ * 
+ * Licensed under the Eclipse Public License v1.0 (the "License"); you may not use this file except
+ * in compliance with the License. You may obtain a copy of the License at
+ * 
+ * http://www.eclipse.org/legal/epl-v10.html
+ * 
+ * Unless required by applicable law or agreed to in writing, software distributed under the License
+ * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
+ * or implied. See the License for the specific language governing permissions and limitations under
+ * the License.
+ */
+package com.google.dart.engine.utilities.collection;
+
+/**
+ * Instances of the class {@code IntList} implement an extensible list of integer values.
+ */
+public class IntList {
+  /**
+   * The number of elements in the list.
+   */
+  private int count;
+
+  /**
+   * An array containing the elements in the list.
+   */
+  private int[] values;
+
+  /**
+   * Initialize a new list of integers to be empty.
+   */
+  public IntList() {
+    this(128);
+  }
+
+  /**
+   * Initialize a new list of integers to be empty but to have room for the given number of elements
+   * without having to grow.
+   * 
+   * @param initialCapacity the initial capacity of the list
+   */
+  public IntList(int initialCapacity) {
+    count = 0;
+    values = new int[initialCapacity];
+  }
+
+  /**
+   * Add the given value to this list of values.
+   * 
+   * @param value the values to be added
+   */
+  public void add(int value) {
+    int length = values.length;
+    if (count >= length) {
+      int[] newValues = new int[length + 64];
+      System.arraycopy(values, 0, newValues, 0, length);
+      values = newValues;
+    }
+    values[count++] = value;
+  }
+
+  /**
+   * Return the number of elements in this list.
+   * 
+   * @return the number of elements in this list
+   */
+  public int size() {
+    return count;
+  }
+
+  /**
+   * Return an array containing all of the elements of this list, in the same order as they were
+   * added to the list, that is exactly the same length as the list.
+   * 
+   * @return an array containing all of the elements of this list
+   */
+  public int[] toArray() {
+    int[] result = new int[count];
+    System.arraycopy(values, 0, result, 0, count);
+    return result;
+  }
+}