| /* |
| * Copyright (C) 2014 Google Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are |
| * met: |
| * |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * * Redistributions in binary form must reproduce the above |
| * copyright notice, this list of conditions and the following disclaimer |
| * in the documentation and/or other materials provided with the |
| * distribution. |
| * * Neither the name of Google Inc. nor the names of its |
| * contributors may be used to endorse or promote products derived from |
| * this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| /** |
| * @interface |
| */ |
| WebInspector.HistoryEntry = function() { } |
| |
| WebInspector.HistoryEntry.prototype = { |
| /** |
| * @return {boolean} |
| */ |
| valid: function() { }, |
| |
| reveal: function() { } |
| }; |
| |
| /** |
| * @constructor |
| * @param {number} historyDepth |
| */ |
| WebInspector.SimpleHistoryManager = function(historyDepth) |
| { |
| this._entries = []; |
| this._activeEntryIndex = -1; |
| this._coalescingReadonly = 0; |
| this._historyDepth = historyDepth; |
| } |
| |
| WebInspector.SimpleHistoryManager.prototype = { |
| readOnlyLock: function() |
| { |
| ++this._coalescingReadonly; |
| }, |
| |
| releaseReadOnlyLock: function() |
| { |
| --this._coalescingReadonly; |
| }, |
| |
| /** |
| * @return {boolean} |
| */ |
| readOnly: function() |
| { |
| return !!this._coalescingReadonly; |
| }, |
| |
| /** |
| * @param {!function(!WebInspector.HistoryEntry):boolean} filterOutCallback |
| */ |
| filterOut: function(filterOutCallback) |
| { |
| if (this.readOnly()) |
| return; |
| var filteredEntries = []; |
| var removedBeforeActiveEntry = 0; |
| for (var i = 0; i < this._entries.length; ++i) { |
| if (!filterOutCallback(this._entries[i])) { |
| filteredEntries.push(this._entries[i]); |
| } else if (i <= this._activeEntryIndex) |
| ++removedBeforeActiveEntry; |
| } |
| this._entries = filteredEntries; |
| this._activeEntryIndex = Math.max(0, this._activeEntryIndex - removedBeforeActiveEntry); |
| }, |
| |
| /** |
| * @return {boolean} |
| */ |
| empty: function() |
| { |
| return !this._entries.length; |
| }, |
| |
| /** |
| * @return {?WebInspector.HistoryEntry} |
| */ |
| active: function() |
| { |
| return this.empty() ? null : this._entries[this._activeEntryIndex]; |
| }, |
| |
| /** |
| * @param {!WebInspector.HistoryEntry} entry |
| */ |
| push: function(entry) |
| { |
| if (this.readOnly()) |
| return; |
| if (!this.empty()) |
| this._entries.splice(this._activeEntryIndex + 1); |
| this._entries.push(entry); |
| if (this._entries.length > this._historyDepth) |
| this._entries.shift(); |
| this._activeEntryIndex = this._entries.length - 1; |
| }, |
| |
| /** |
| * @return {boolean} |
| */ |
| rollback: function() |
| { |
| if (this.empty()) |
| return false; |
| |
| var revealIndex = this._activeEntryIndex - 1; |
| while (revealIndex >= 0 && !this._entries[revealIndex].valid()) |
| --revealIndex; |
| if (revealIndex < 0) |
| return false; |
| |
| this.readOnlyLock(); |
| this._entries[revealIndex].reveal(); |
| this.releaseReadOnlyLock(); |
| |
| this._activeEntryIndex = revealIndex; |
| return true; |
| }, |
| |
| /** |
| * @return {boolean} |
| */ |
| rollover: function() |
| { |
| var revealIndex = this._activeEntryIndex + 1; |
| |
| while (revealIndex < this._entries.length && !this._entries[revealIndex].valid()) |
| ++revealIndex; |
| if (revealIndex >= this._entries.length) |
| return false; |
| |
| this.readOnlyLock(); |
| this._entries[revealIndex].reveal(); |
| this.releaseReadOnlyLock(); |
| |
| this._activeEntryIndex = revealIndex; |
| return true; |
| }, |
| }; |