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