Refactor print preview web ui

chrome/browser/resources/print_preview/data/page_number_set.js

+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+cr.define('print_preview', function() {
+  'use strict';
+
+  /**
+   * An immutable ordered set of page numbers.
+   *
+   * @param {!Array.<number>} pageNumberList A list of page numbers to include
+   *     in the set.
+   * @constructor
+   */
+  function PageNumberSet(pageNumberList) {
+    /**
+     * Internal data store for the page number set.
+     * @type {!Array.<number>}
+     * @private
+     */
+    this.pageNumberSet_ = pageListToPageSet(pageNumberList);
+  };
+
+  /**
+   * @param {string} pageRangeStr String form of a page range. I.e. '2,3,4-5'.
+   *     If string is empty, all page numbers will be in the page number set.
+   * @param {number} totalPageCount Total number of pages in the original
+   *     document.
+   * @return {print_preview.PageNumberSet} Page number set parsed from the
+   *     given page range string and total page count. Null returned if
+   *     the given page range string is invalid.
+   */
+  PageNumberSet.parse = function(pageRangeStr, totalPageCount) {
+    if (pageRangeStr == '') {
+      var pageNumberList = [];
+      for (var i = 0; i < totalPageCount; i++) {
+        pageNumberList.push(i + 1);
+      }
+      return new PageNumberSet(pageNumberList);
+    } else {
+      return isPageRangeTextValid(pageRangeStr, totalPageCount) ?
+          new PageNumberSet(
+              pageRangeTextToPageList(pageRangeStr, totalPageCount)) : null;
+    }
+  };
+
+  PageNumberSet.prototype = {
+    /** @return {number} The number of page numbers in the set. */
+    get size() {
+      return this.pageNumberSet_.length;
+    },
+
+    /**
+     * @param {number} index 0-based index of the page number to get.
+     * @return {number} Page number at the given index.
+     */
+    getPageNumberAt: function(index) {
+      return this.pageNumberSet_[index];
+    },
+
+    /**
+     * @param {number} 1-based page number to check for.
+     * @return {boolean} Whether the given page number is in the page range.
+     */
+    hasPageNumber: function(pageNumber) {
+      return arrayContains(this.pageNumberSet_, pageNumber);
+    },
+
+    /**
+     * @param {number} 1-based number of the page to get index of.
+     * @return {number} 0-based index of the given page number with respect to
+     *     all of the pages in the page range.
+     */
+    getPageNumberIndex: function(pageNumber) {
+      return this.pageNumberSet_.indexOf(pageNumber);
+    },
+
+    /**
+     * @param {print_preview.PageNumberSet} other Page number set to compare
+     *     against.
+     * @return {boolean} Whether another page number set is equal to this one.
+     */
+    equals: function(other) {
+      return other == null ?
+          false : areArraysEqual(this.pageNumberSet_, other.pageNumberSet_);
+    }
+  };
+
+  // Export
+  return {
+    PageNumberSet: PageNumberSet
+  };
+});