michael@0: /* -*- Mode: Javascript; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
michael@0: /* vim: set ts=2 et sw=2 tw=80: */
michael@0: /* Any copyright is dedicated to the Public Domain.
michael@0:    http://creativecommons.org/publicdomain/zero/1.0/ */
michael@0: 
michael@0: const Cu = Components.utils;
michael@0: let {Loader} = Cu.import("resource://gre/modules/commonjs/toolkit/loader.js", {});
michael@0: 
michael@0: let loader = new Loader.Loader({
michael@0:   paths: {
michael@0:     "": "resource://gre/modules/commonjs/",
michael@0:     "devtools": "resource:///modules/devtools",
michael@0:   },
michael@0:   globals: {},
michael@0: });
michael@0: let require = Loader.Require(loader, { id: "undo-test" })
michael@0: 
michael@0: let {UndoStack} = require("devtools/shared/undo");
michael@0: 
michael@0: const MAX_SIZE = 5;
michael@0: 
michael@0: function run_test()
michael@0: {
michael@0:   let str = "";
michael@0:   let stack = new UndoStack(MAX_SIZE);
michael@0: 
michael@0:   function add(ch) {
michael@0:     stack.do(function() {
michael@0:       str += ch;
michael@0:     }, function() {
michael@0:       str = str.slice(0, -1);
michael@0:     });
michael@0:   }
michael@0: 
michael@0:   do_check_false(stack.canUndo());
michael@0:   do_check_false(stack.canRedo());
michael@0: 
michael@0:   // Check adding up to the limit of the size
michael@0:   add("a");
michael@0:   do_check_true(stack.canUndo());
michael@0:   do_check_false(stack.canRedo());
michael@0: 
michael@0:   add("b");
michael@0:   add("c");
michael@0:   add("d");
michael@0:   add("e");
michael@0: 
michael@0:   do_check_eq(str, "abcde");
michael@0: 
michael@0:   // Check a simple undo+redo
michael@0:   stack.undo();
michael@0: 
michael@0:   do_check_eq(str, "abcd");
michael@0:   do_check_true(stack.canRedo());
michael@0: 
michael@0:   stack.redo();
michael@0:   do_check_eq(str, "abcde")
michael@0:   do_check_false(stack.canRedo());
michael@0: 
michael@0:   // Check an undo followed by a new action
michael@0:   stack.undo();
michael@0:   do_check_eq(str, "abcd");
michael@0: 
michael@0:   add("q");
michael@0:   do_check_eq(str, "abcdq");
michael@0:   do_check_false(stack.canRedo());
michael@0: 
michael@0:   stack.undo();
michael@0:   do_check_eq(str, "abcd");
michael@0:   stack.redo();
michael@0:   do_check_eq(str, "abcdq");
michael@0: 
michael@0:   // Revert back to the beginning of the queue...
michael@0:   while (stack.canUndo()) {
michael@0:     stack.undo();
michael@0:   }
michael@0:   do_check_eq(str, "");
michael@0: 
michael@0:   // Now put it all back....
michael@0:   while (stack.canRedo()) {
michael@0:     stack.redo();
michael@0:   }
michael@0:   do_check_eq(str, "abcdq");
michael@0: 
michael@0:   // Now go over the undo limit...
michael@0:   add("1");
michael@0:   add("2");
michael@0:   add("3");
michael@0: 
michael@0:   do_check_eq(str, "abcdq123");
michael@0: 
michael@0:   // And now undoing the whole stack should only undo 5 actions.
michael@0:   while (stack.canUndo()) {
michael@0:     stack.undo();
michael@0:   }
michael@0: 
michael@0:   do_check_eq(str, "abc");
michael@0: }