From 464e29230eeb8c25dfb064f14239b1288c85332b Mon Sep 17 00:00:00 2001
From: "Matt A. Tobin" <email@mattatobin.com>
Date: Fri, 2 Feb 2018 07:11:37 -0500
Subject: Issue N/A - Restore the Toolkit Error Console - Part 1: Toolkit

---
 toolkit/components/console/content/console.css     |  74 +++
 toolkit/components/console/content/console.js      | 111 +++++
 toolkit/components/console/content/console.xul     | 101 ++++
 .../components/console/content/consoleBindings.xml | 547 +++++++++++++++++++++
 toolkit/components/console/jar.mn                  |   9 +
 toolkit/components/console/jsconsole-clhandler.js  |  40 ++
 .../console/jsconsole-clhandler.manifest           |   3 +
 toolkit/components/console/moz.build               |  14 +
 toolkit/components/console/tests/chrome.ini        |   3 +
 toolkit/components/console/tests/test_hugeURIs.xul |  64 +++
 10 files changed, 966 insertions(+)
 create mode 100644 toolkit/components/console/content/console.css
 create mode 100644 toolkit/components/console/content/console.js
 create mode 100644 toolkit/components/console/content/console.xul
 create mode 100644 toolkit/components/console/content/consoleBindings.xml
 create mode 100644 toolkit/components/console/jar.mn
 create mode 100644 toolkit/components/console/jsconsole-clhandler.js
 create mode 100644 toolkit/components/console/jsconsole-clhandler.manifest
 create mode 100644 toolkit/components/console/moz.build
 create mode 100644 toolkit/components/console/tests/chrome.ini
 create mode 100644 toolkit/components/console/tests/test_hugeURIs.xul

(limited to 'toolkit/components/console')

diff --git a/toolkit/components/console/content/console.css b/toolkit/components/console/content/console.css
new file mode 100644
index 000000000..e05f13c3e
--- /dev/null
+++ b/toolkit/components/console/content/console.css
@@ -0,0 +1,74 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+
+.console-box {
+  -moz-binding: url("chrome://global/content/consoleBindings.xml#console-box");
+  overflow: auto;
+}
+
+.console-rows {
+  -moz-user-focus: normal;
+}
+
+.console-row[type="error"],
+.console-row[type="warning"] {
+  -moz-binding: url("chrome://global/content/consoleBindings.xml#error");
+}
+
+.console-row[type="message"] {
+  -moz-binding: url("chrome://global/content/consoleBindings.xml#message");
+}
+
+.console-msg-text,
+.console-error-msg {
+  white-space: pre-wrap;
+}
+
+.console-error-source {
+  -moz-binding: url("chrome://global/content/consoleBindings.xml#console-error-source");
+}
+
+.console-dots {
+  width: 1px;
+}
+
+/* :::::::::: hiding and showing of rows for each mode :::::::::: */
+
+.console-box[mode="Warnings"] > .console-box-internal > .console-rows 
+    > .console-row[type="error"],
+.console-box[mode="Messages"] > .console-box-internal > .console-rows 
+    > .console-row[type="error"]
+{
+  display: none;
+}
+
+.console-box[mode="Errors"] > .console-box-internal > .console-rows 
+    > .console-row[type="warning"],
+.console-box[mode="Messages"] > .console-box-internal > .console-rows 
+    > .console-row[type="warning"]
+{
+  display: none;
+}
+
+.console-box[mode="Errors"] > .console-box-internal > .console-rows 
+    > .console-row[type="message"],
+.console-box[mode="Warnings"] > .console-box-internal > .console-rows 
+    > .console-row[type="message"]
+{
+  display: none;
+}
+
+.filtered-by-string {
+  display: none;
+}
+
+/* If line number is 0, hide the line number section */
+.lineNumberRow[line="0"] {
+  display: none;
+}
+
+#TextboxEval {
+  direction: ltr;
+}
diff --git a/toolkit/components/console/content/console.js b/toolkit/components/console/content/console.js
new file mode 100644
index 000000000..ad6802607
--- /dev/null
+++ b/toolkit/components/console/content/console.js
@@ -0,0 +1,111 @@
+// -*- indent-tabs-mode: nil; js-indent-level: 2 -*-
+
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+Components.utils.import("resource://gre/modules/Services.jsm");
+
+var gConsole, gConsoleBundle, gTextBoxEval, gEvaluator, gCodeToEvaluate;
+var gFilter;
+
+/* :::::::: Console Initialization ::::::::::::::: */
+
+window.onload = function()
+{
+  gConsole = document.getElementById("ConsoleBox");
+  gConsoleBundle = document.getElementById("ConsoleBundle");
+  gTextBoxEval = document.getElementById("TextboxEval");
+  gEvaluator = document.getElementById("Evaluator");
+  gFilter = document.getElementById("Filter");
+  
+  updateSortCommand(gConsole.sortOrder);
+  updateModeCommand(gConsole.mode);
+
+  gEvaluator.addEventListener("load", loadOrDisplayResult, true);
+}
+
+/* :::::::: Console UI Functions ::::::::::::::: */
+
+function changeFilter()
+{
+  gConsole.filter = gFilter.value;
+
+  document.persist("ConsoleBox", "filter");
+}
+
+function changeMode(aMode)
+{
+  switch (aMode) {
+    case "Errors":
+    case "Warnings":
+    case "Messages":
+      gConsole.mode = aMode;
+      break;
+    case "All":
+      gConsole.mode = null;
+  }
+  
+  document.persist("ConsoleBox", "mode");
+}
+
+function clearConsole()
+{
+  gConsole.clear();
+}
+
+function changeSortOrder(aOrder)
+{
+  updateSortCommand(gConsole.sortOrder = aOrder);
+}
+
+function updateSortCommand(aOrder)
+{
+  var orderString = aOrder == 'reverse' ? "Descend" : "Ascend";
+  var bc = document.getElementById("Console:sort"+orderString);
+  bc.setAttribute("checked", true);  
+
+  orderString = aOrder == 'reverse' ? "Ascend" : "Descend";
+  bc = document.getElementById("Console:sort"+orderString);
+  bc.setAttribute("checked", false);
+}
+
+function updateModeCommand(aMode)
+{
+  /* aMode can end up invalid if it set by an extension that replaces */
+  /* mode and then it is uninstalled or disabled */
+  var bc = document.getElementById("Console:mode" + aMode) ||
+           document.getElementById("Console:modeAll");
+  bc.setAttribute("checked", true);
+}
+
+function onEvalKeyPress(aEvent)
+{
+  if (aEvent.keyCode == 13)
+    evaluateTypein();
+}
+
+function evaluateTypein()
+{
+  gCodeToEvaluate = gTextBoxEval.value;
+  // reset the iframe first; the code will be evaluated in loadOrDisplayResult
+  // below, once about:blank has completed loading (see bug 385092)
+  gEvaluator.contentWindow.location = "about:blank";
+}
+
+function loadOrDisplayResult()
+{
+  if (gCodeToEvaluate) {
+    gEvaluator.contentWindow.location = "javascript: " +
+                                        gCodeToEvaluate.replace(/%/g, "%25");
+    gCodeToEvaluate = "";
+    return;
+  }
+
+  var resultRange = gEvaluator.contentDocument.createRange();
+  resultRange.selectNode(gEvaluator.contentDocument.documentElement);
+  var result = resultRange.toString();
+  if (result)
+    Services.console.logStringMessage(result);
+    // or could use appendMessage which doesn't persist
+}
diff --git a/toolkit/components/console/content/console.xul b/toolkit/components/console/content/console.xul
new file mode 100644
index 000000000..0abd0a981
--- /dev/null
+++ b/toolkit/components/console/content/console.xul
@@ -0,0 +1,101 @@
+<?xml version="1.0"?> <!-- -*- tab-width: 4; indent-tabs-mode: nil -*- -->
+
+<!-- This Source Code Form is subject to the terms of the Mozilla Public
+   - License, v. 2.0. If a copy of the MPL was not distributed with this
+   - file, You can obtain one at http://mozilla.org/MPL/2.0/. -->
+
+<?xml-stylesheet href="chrome://global/skin/" type="text/css"?> 
+<?xml-stylesheet href="chrome://global/skin/console/console.css" type="text/css"?> 
+<?xml-stylesheet href="chrome://global/content/console.css" type="text/css"?> 
+<?xul-overlay href="chrome://global/content/editMenuOverlay.xul"?>
+
+<!DOCTYPE window [
+  <!ENTITY % console SYSTEM "chrome://global/locale/console.dtd"> %console;
+]>
+
+<window id="JSConsoleWindow"
+        xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
+        title="&errorConsole.title;"
+        windowtype="global:console"
+        width="640" height="480"
+        screenX="10" screenY="10"
+        persist="screenX screenY width height sizemode"
+        onclose="return closeWindow(false);"> 
+
+  <script type="application/javascript" src="chrome://global/content/globalOverlay.js"/>
+  <script type="application/javascript" src="chrome://global/content/console.js"/>
+  <script type="application/javascript" src="chrome://global/content/viewSourceUtils.js"/>
+
+  <stringbundle id="ConsoleBundle" src="chrome://global/locale/console.properties"/>
+
+  <commandset id="editMenuCommands"/>
+
+  <commandset id="consoleCommands">
+    <command id="cmd_close" oncommand="closeWindow(true)"/>
+  </commandset>
+
+  <keyset id="consoleKeys">
+    <key id="key_close" key="&closeCmd.commandkey;" modifiers="accel"
+         command="cmd_close"/>
+    <key id="key_close2" keycode="VK_ESCAPE" command="cmd_close"/>
+    <key id="key_focus1" key="&focus1.commandkey;" modifiers="accel"
+         oncommand="gTextBoxEval.focus()"/>
+    <key id="key_focus2" key="&focus2.commandkey;" modifiers="alt"
+         oncommand="gTextBoxEval.focus()"/>
+  </keyset>
+
+  <popupset id="ContextMenus">
+    <menupopup id="ConsoleContext">
+      <menuitem type="radio" id="Console:sortAscend"
+                label="&sortFirst.label;" accesskey="&sortFirst.accesskey;"
+                oncommand="changeSortOrder('forward');"/>
+      <menuitem type="radio" id="Console:sortDescend"
+                label="&sortLast.label;" accesskey="&sortLast.accesskey;"
+                oncommand="changeSortOrder('reverse');"/>
+      <menuseparator/>
+      <menuitem id="menu_copy_cm" command="cmd_copy"
+                label="&copyCmd.label;" accesskey="&copyCmd.accesskey;"/>
+    </menupopup>
+  </popupset>
+
+  <toolbox id="console-toolbox">
+    <toolbar class="chromeclass-toolbar" id="ToolbarMode">
+      <hbox id="viewGroup">
+        <toolbarbutton type="radio" group="mode" id="Console:modeAll" 
+                       label="&all.label;" accesskey="&all.accesskey;"
+                       oncommand="changeMode('All');"/>
+        <toolbarbutton type="radio" group="mode" id="Console:modeErrors"
+                       label="&errors.label;" accesskey="&errors.accesskey;"
+                       oncommand="changeMode('Errors');"/>
+        <toolbarbutton type="radio" group="mode" id="Console:modeWarnings"
+                       label="&warnings.label;" accesskey="&warnings.accesskey;"
+                       oncommand="changeMode('Warnings');"/>
+        <toolbarbutton type="radio" group="mode" id="Console:modeMessages"
+                     label="&messages.label;" accesskey="&messages.accesskey;"
+                     oncommand="changeMode('Messages');"/>
+      </hbox>
+      <toolbarseparator/>
+      <toolbarbutton id="Console:clear" oncommand="clearConsole();"
+                     label="&clear.label;" accesskey="&clear.accesskey;"/>
+    </toolbar>
+
+    <toolbar class="chromeclass-toolbar" id="ToolbarEval" align="center" nowindowdrag="true">
+      <label value="&codeEval.label;" accesskey="&codeEval.accesskey;" control="TextboxEval"/>
+      <textbox id="TextboxEval" class="toolbar" value="" onkeypress="onEvalKeyPress(event)" flex="1"/>
+      <toolbarbutton id="ButtonEval" label="&evaluate.label;"
+                     accesskey="&evaluate.accesskey;" oncommand="evaluateTypein()"/>
+    </toolbar>
+  </toolbox>
+
+  <vbox id="ConsoleBox" class="console-box" flex="1" context="ConsoleContext" persist="sortOrder"/>
+
+  <iframe name="Evaluator" id="Evaluator" collapsed="true"/>
+
+  <statusbar>
+    <statusbarpanel flex="1" pack="start">
+      <label value="&filter2.label;" control="Filter"/>
+      <textbox accesskey="&filter2.accesskey;" type="search"
+               id="Filter" oncommand="changeFilter();"/>
+    </statusbarpanel>
+  </statusbar>
+</window>
diff --git a/toolkit/components/console/content/consoleBindings.xml b/toolkit/components/console/content/consoleBindings.xml
new file mode 100644
index 000000000..1b00326bf
--- /dev/null
+++ b/toolkit/components/console/content/consoleBindings.xml
@@ -0,0 +1,547 @@
+<?xml version="1.0"?>
+<!-- This Source Code Form is subject to the terms of the Mozilla Public
+   - License, v. 2.0. If a copy of the MPL was not distributed with this
+   - file, You can obtain one at http://mozilla.org/MPL/2.0/. -->
+
+
+<!DOCTYPE bindings SYSTEM "chrome://global/locale/console.dtd">
+
+<bindings id="consoleBindings"
+          xmlns="http://www.mozilla.org/xbl"
+          xmlns:xul="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
+          xmlns:xbl="http://www.mozilla.org/xbl">
+
+  <binding id="console-box" extends="xul:box">
+    <content>  
+      <xul:stringbundle src="chrome://global/locale/console.properties" role="string-bundle"/>
+      <xul:vbox class="console-box-internal">
+        <xul:vbox class="console-rows" role="console-rows" xbl:inherits="dir=sortOrder"/>
+      </xul:vbox>
+    </content>
+
+    <implementation>
+      <field name="limit" readonly="true">
+        250
+      </field>
+
+      <field name="fieldMaxLength" readonly="true">
+        <!-- Limit displayed string lengths to avoid performance issues. (Bug 796179 and 831020) -->
+        200
+      </field>
+
+      <field name="showChromeErrors" readonly="true">
+        Services.prefs.getBoolPref("javascript.options.showInConsole");
+      </field>
+
+      <property name="count" readonly="true">
+        <getter>return this.mCount</getter>
+      </property>
+
+      <property name="mode">
+        <getter>return this.mMode;</getter>
+        <setter><![CDATA[
+          if (this.mode != val) {
+            this.mMode = val || "All";
+            this.setAttribute("mode", this.mMode);
+            this.selectedItem = null;
+          }
+          return val;
+        ]]></setter>
+      </property>
+
+      <property name="filter">
+        <getter>return this.mFilter;</getter>
+        <setter><![CDATA[
+          val = val.toLowerCase();
+          if (this.mFilter != val) {
+            this.mFilter = val;
+            for (let aRow of this.mConsoleRowBox.children) {
+              this.filterElement(aRow);
+            }
+          }
+          return val;
+        ]]></setter>
+      </property>
+
+      <property name="sortOrder">
+        <getter>return this.getAttribute("sortOrder");</getter>
+        <setter>this.setAttribute("sortOrder", val); return val;</setter>
+      </property>
+      <field name="mSelectedItem">null</field>
+      <property name="selectedItem">
+        <getter>return this.mSelectedItem</getter>
+        <setter><![CDATA[
+          if (this.mSelectedItem)
+            this.mSelectedItem.removeAttribute("selected");
+
+          this.mSelectedItem = val;
+          if (val)
+            val.setAttribute("selected", "true");
+
+          // Update edit commands
+          window.updateCommands("focus");
+          return val;
+        ]]></setter>
+      </property>
+
+      <method name="init">
+        <body><![CDATA[
+          this.mCount = 0;
+
+          this.mConsoleListener = {
+            console: this, 
+            observe : function(aObject) {
+              // The message can arrive a little bit after the xbl binding has been
+              // unbind. So node.appendItem will not be available anymore.
+              if ('appendItem' in this.console)
+                this.console.appendItem(aObject);
+            }
+          };
+
+          this.mConsoleRowBox = document.getAnonymousElementByAttribute(this, "role", "console-rows");
+          this.mStrBundle = document.getAnonymousElementByAttribute(this, "role", "string-bundle");
+
+          try {
+            Services.console.registerListener(this.mConsoleListener);
+          } catch (ex) {
+            appendItem(
+              "Unable to display errors - couldn't get Console Service component. " +
+              "(Missing @mozilla.org/consoleservice;1)");
+            return;
+          }
+
+          this.mMode = this.getAttribute("mode") || "All";
+          this.mFilter = "";
+
+          this.appendInitialItems();
+          window.controllers.insertControllerAt(0, this._controller);
+        ]]></body>
+      </method>
+
+      <method name="destroy">
+        <body><![CDATA[
+          Services.console.unregisterListener(this.mConsoleListener);
+          window.controllers.removeController(this._controller);
+        ]]></body>
+      </method>
+
+      <method name="appendInitialItems">
+        <body><![CDATA[
+          var messages = Services.console.getMessageArray();
+
+          // In case getMessageArray returns 0-length array as null
+          if (!messages)
+            messages = [];
+
+          var limit = messages.length - this.limit;
+          if (limit < 0) limit = 0;
+
+          // Checks if console ever been cleared
+          for (var i = messages.length - 1; i >= limit; --i)
+            if (!messages[i].message)
+              break;
+
+          // Populate with messages after latest "clear"
+          while (++i < messages.length)
+            this.appendItem(messages[i]);
+        ]]></body>
+      </method>
+
+      <method name="appendItem">
+        <parameter name="aObject"/>
+        <body><![CDATA[
+          try {
+            // Try to QI it to a script error to get more info
+            var scriptError = aObject.QueryInterface(Components.interfaces.nsIScriptError);
+
+            // filter chrome urls
+            if (!this.showChromeErrors && scriptError.sourceName.substr(0, 9) == "chrome://")
+              return;
+
+            // filter private windows
+            if (scriptError.isFromPrivateWindow)
+              return;
+
+            this.appendError(scriptError);
+          } catch (ex) {
+            try {
+              // Try to QI it to a console message
+              var msg = aObject.QueryInterface(Components.interfaces.nsIConsoleMessage);
+              if (msg.message)
+                this.appendMessage(msg.message);
+              else // observed a null/"clear" message
+                this.clearConsole();
+            } catch (ex2) {
+              // Give up and append the object itself as a string
+              this.appendMessage(aObject);
+            }
+          }
+        ]]></body>
+      </method>
+
+      <method name="_truncateIfNecessary">
+        <parameter name="aString"/>
+        <parameter name="aMiddleCharacter"/>
+        <body><![CDATA[
+          if (!aString || aString.length <= this.fieldMaxLength)
+            return {string: aString, column: aMiddleCharacter};
+          let halfLimit = this.fieldMaxLength / 2;
+          if (!aMiddleCharacter || aMiddleCharacter < 0 || aMiddleCharacter > aString.length)
+            aMiddleCharacter = halfLimit;
+
+          let startPosition = 0;
+          let endPosition = aString.length;
+          if (aMiddleCharacter - halfLimit >= 0)
+            startPosition = aMiddleCharacter - halfLimit;
+          if (aMiddleCharacter + halfLimit <= aString.length)
+            endPosition = aMiddleCharacter + halfLimit;
+          if (endPosition - startPosition < this.fieldMaxLength)
+            endPosition += this.fieldMaxLength - (endPosition - startPosition);
+          let truncatedString = aString.substring(startPosition, endPosition);
+          let Ci = Components.interfaces;
+          let ellipsis = Services.prefs.getComplexValue("intl.ellipsis",
+                                                        Ci.nsIPrefLocalizedString).data;
+          if (startPosition > 0) {
+            truncatedString = ellipsis + truncatedString;
+            aMiddleCharacter += ellipsis.length;
+          }
+          if (endPosition < aString.length)
+            truncatedString = truncatedString + ellipsis;
+
+          return {
+            string: truncatedString,
+            column: aMiddleCharacter - startPosition
+          };
+        ]]></body>
+      </method>
+
+      <method name="appendError">
+        <parameter name="aObject"/>
+        <body><![CDATA[
+          var row = this.createConsoleRow();
+          var nsIScriptError = Components.interfaces.nsIScriptError;
+
+          // Is this error actually just a non-fatal warning?
+          var warning = aObject.flags & nsIScriptError.warningFlag != 0;
+
+          var typetext = warning ? "typeWarning" : "typeError";
+          row.setAttribute("typetext", this.mStrBundle.getString(typetext));
+          row.setAttribute("type", warning ? "warning" : "error");
+          row.setAttribute("msg", aObject.errorMessage);
+          row.setAttribute("category", aObject.category);
+          row.setAttribute("time", this.properFormatTime(aObject.timeStamp));
+          if (aObject.lineNumber || aObject.sourceName) {
+            row.setAttribute("href", this._truncateIfNecessary(aObject.sourceName).string);
+            row.mSourceName = aObject.sourceName;
+            row.setAttribute("line", aObject.lineNumber);
+          } else {
+            row.setAttribute("hideSource", "true");
+          }
+          if (aObject.sourceLine) {
+            let sourceLine = aObject.sourceLine.replace(/\s/g, " ");
+            let truncatedLineObj = this._truncateIfNecessary(sourceLine, aObject.columnNumber);
+            row.setAttribute("code", truncatedLineObj.string);
+            row.mSourceLine = sourceLine;
+            if (aObject.columnNumber) {
+              row.setAttribute("col", aObject.columnNumber);
+              row.setAttribute("errorDots", this.repeatChar(" ", truncatedLineObj.column));
+              row.setAttribute("errorCaret", " ");
+            } else {
+              row.setAttribute("hideCaret", "true");
+            }
+          } else {
+            row.setAttribute("hideCode", "true");
+          }
+
+          this.appendConsoleRow(row);
+        ]]></body>
+      </method>
+
+      <method name="appendMessage">
+        <parameter name="aMessage"/>
+        <parameter name="aType"/>
+        <body><![CDATA[
+          var row = this.createConsoleRow();
+          row.setAttribute("type", aType || "message");
+          row.setAttribute("msg", aMessage);
+          this.appendConsoleRow(row);
+        ]]></body>
+      </method>
+
+      <method name="clear">
+        <body><![CDATA[
+          // add a "clear" message (mainly for other listeners)
+          Services.console.logStringMessage(null);
+          Services.console.reset();
+        ]]></body>
+      </method>
+
+      <method name="properFormatTime">
+        <parameter name="aTime"/>
+        <body><![CDATA[
+          const dateServ = Components.classes["@mozilla.org/intl/scriptabledateformat;1"]
+                                     .getService(Components.interfaces.nsIScriptableDateFormat);
+          let errorTime = new Date(aTime);
+          return dateServ.FormatDateTime("", dateServ.dateFormatShort, dateServ.timeFormatSeconds,
+              errorTime.getFullYear(), errorTime.getMonth() + 1, errorTime.getDate(),
+              errorTime.getHours(), errorTime.getMinutes(), errorTime.getSeconds());
+        ]]></body>
+      </method>
+
+      <method name="copySelectedItem">
+        <body><![CDATA[
+          if (this.mSelectedItem) try {
+            const clipURI = "@mozilla.org/widget/clipboardhelper;1";
+            const clipI = Components.interfaces.nsIClipboardHelper;
+            var clipboard = Components.classes[clipURI].getService(clipI);
+
+            clipboard.copyString(this.mSelectedItem.toString(), document);
+          } catch (ex) {
+            // Unable to copy anything, die quietly
+          }
+        ]]></body>
+      </method>
+
+      <method name="createConsoleRow">
+        <body><![CDATA[
+          var row = document.createElement("box");
+          row.setAttribute("class", "console-row");
+          row._IsConsoleRow = true;
+          row._ConsoleBox = this;
+          return row;
+        ]]></body>
+      </method>
+
+      <method name="appendConsoleRow">
+        <parameter name="aRow"/>
+        <body><![CDATA[
+          this.filterElement(aRow);
+          this.mConsoleRowBox.appendChild(aRow);
+          if (++this.mCount > this.limit) this.deleteFirst();
+        ]]></body>
+      </method>
+
+      <method name="deleteFirst">
+        <body><![CDATA[
+          var node = this.mConsoleRowBox.firstChild;
+          this.mConsoleRowBox.removeChild(node);
+          --this.mCount;
+        ]]></body>
+      </method>
+
+      <method name="clearConsole">
+        <body><![CDATA[
+          if (this.mCount == 0) // already clear
+            return;
+          this.mCount = 0;
+
+          var newRows = this.mConsoleRowBox.cloneNode(false);
+          this.mConsoleRowBox.parentNode.replaceChild(newRows, this.mConsoleRowBox);
+          this.mConsoleRowBox = newRows;
+          this.selectedItem = null;
+        ]]></body>
+      </method>
+
+      <method name="filterElement">
+        <parameter name="aRow" />
+        <body><![CDATA[
+          let anyMatch = ["msg", "line", "code"].some(function (key) {
+            return (aRow.hasAttribute(key) &&
+                    this.stringMatchesFilters(aRow.getAttribute(key), this.mFilter));
+          }, this) || (aRow.mSourceName &&
+                       this.stringMatchesFilters(aRow.mSourceName, this.mFilter));
+
+          if (anyMatch) {
+            aRow.classList.remove("filtered-by-string")
+          } else {
+            aRow.classList.add("filtered-by-string")
+          }
+        ]]></body>
+      </method>
+
+      <!-- UTILITY FUNCTIONS -->
+      
+      <method name="repeatChar">
+        <parameter name="aChar"/>
+        <parameter name="aCol"/>
+        <body><![CDATA[
+          if (--aCol <= 0)
+            return "";
+
+          for (var i = 2; i < aCol; i += i)
+            aChar += aChar;
+
+          return aChar + aChar.slice(0, aCol - aChar.length);
+        ]]></body>
+      </method>
+
+      <method name="stringMatchesFilters">
+        <parameter name="aString"/>
+        <parameter name="aFilter"/>
+        <body><![CDATA[
+          if (!aString || !aFilter) {
+            return true;
+          }
+
+          let searchStr = aString.toLowerCase();
+          let filterStrings = aFilter.split(/\s+/);
+          return !filterStrings.some(function (f) {
+            return searchStr.indexOf(f) == -1;
+          });
+        ]]></body>
+      </method>
+          
+      <constructor> this.init(); </constructor>
+      <destructor> this.destroy(); </destructor>
+
+      <!-- Command controller for the copy command -->
+      <field name="_controller"><![CDATA[({
+        _outer: this,
+
+        QueryInterface: function(aIID) {
+          if (aIID.equals(Components.interfaces.nsIController) ||
+              aIID.equals(Components.interfaces.nsISupports))
+            return this;
+          throw Components.results.NS_NOINTERFACE;
+        },
+
+        supportsCommand: function(aCommand) {
+          return aCommand == "cmd_copy";
+        },
+
+        isCommandEnabled: function(aCommand) {
+          return aCommand == "cmd_copy" && this._outer.selectedItem;
+        },
+
+        doCommand: function(aCommand) {
+          if (aCommand == "cmd_copy")
+            this._outer.copySelectedItem();
+        },
+
+        onEvent: function() { }
+      });]]></field>
+    </implementation>
+
+    <handlers>
+      <handler event="mousedown"><![CDATA[
+        if (event.button == 0 || event.button == 2) {
+          var target = event.originalTarget;
+
+          while (target && !("_IsConsoleRow" in target))
+            target = target.parentNode;
+
+          if (target)
+            this.selectedItem = target;
+        }
+      ]]></handler>
+    </handlers>
+  </binding>
+
+  <binding id="error" extends="xul:box">
+    <content>
+      <xul:box class="console-row-internal-box" flex="1">
+        <xul:box class="console-row-icon" align="center" xbl:inherits="selected">
+          <xul:image class="console-icon" xbl:inherits="src,type"/>
+        </xul:box>
+        <xul:vbox class="console-row-content" xbl:inherits="selected" flex="1">
+          <xul:box class="console-row-msg" align="start">
+            <xul:label class="label" xbl:inherits="value=typetext"/>
+            <xul:description class="console-error-msg" xbl:inherits="xbl:text=msg" flex="1"/>
+            <xul:label class="label console-time" xbl:inherits="value=time"/>
+          </xul:box>
+          <xul:box class="console-row-file" xbl:inherits="hidden=hideSource">
+            <xul:label class="label" value="&errFile.label;"/>
+            <xul:box class="console-error-source" xbl:inherits="href,line"/>
+            <xul:spacer flex="1"/>
+            <xul:hbox class="lineNumberRow" xbl:inherits="line">
+              <xul:label class="label" value="&errLine.label;"/>
+              <xul:label class="label" xbl:inherits="value=line"/>
+            </xul:hbox>
+          </xul:box>
+          <xul:vbox class="console-row-code" xbl:inherits="selected,hidden=hideCode">
+            <xul:label class="monospace console-code" xbl:inherits="value=code" crop="end"/>
+            <xul:box xbl:inherits="hidden=hideCaret">
+              <xul:label class="monospace console-dots" xbl:inherits="value=errorDots"/>
+              <xul:label class="monospace console-caret" xbl:inherits="value=errorCaret"/>
+              <xul:spacer flex="1"/>
+            </xul:box>
+          </xul:vbox>
+        </xul:vbox>
+      </xul:box>
+    </content>
+
+    <implementation>
+      <field name="mSourceName">null</field>
+      <field name="mSourceLine">null</field>
+
+      <method name="toString">
+        <body><![CDATA[
+          let msg = "";
+          let strBundle = this._ConsoleBox.mStrBundle;
+
+          if (this.hasAttribute("time"))
+            msg += strBundle.getFormattedString("errTime", [this.getAttribute("time")]) + "\n";
+
+          msg += this.getAttribute("typetext") + " " + this.getAttribute("msg");
+
+          if (this.hasAttribute("line") && this.mSourceName) {
+            msg += "\n" + strBundle.getFormattedString("errFile",
+                                        [this.mSourceName]) + "\n";
+            if (this.hasAttribute("col")) {
+              msg += strBundle.getFormattedString("errLineCol",
+                         [this.getAttribute("line"), this.getAttribute("col")]);
+            } else
+              msg += strBundle.getFormattedString("errLine", [this.getAttribute("line")]);
+          }
+
+          if (this.hasAttribute("code"))
+            msg += "\n" + strBundle.getString("errCode") + "\n" + this.mSourceLine;
+
+          return msg;
+        ]]></body>
+      </method>
+    </implementation>
+
+  </binding>
+
+  <binding id="message" extends="xul:box">
+    <content>
+      <xul:box class="console-internal-box" flex="1">
+        <xul:box class="console-row-icon" align="center">
+          <xul:image class="console-icon" xbl:inherits="src,type"/>
+        </xul:box>
+        <xul:vbox class="console-row-content" xbl:inherits="selected" flex="1">
+          <xul:vbox class="console-row-msg" flex="1">
+            <xul:description class="console-msg-text" xbl:inherits="xbl:text=msg"/>
+          </xul:vbox>
+        </xul:vbox>
+      </xul:box>
+    </content>
+
+    <implementation>
+      <method name="toString">
+        <body><![CDATA[
+          return this.getAttribute("msg");
+        ]]></body>
+      </method>
+    </implementation>
+  </binding>
+
+  <binding id="console-error-source" extends="xul:box">
+    <content>
+      <xul:label class="text-link" xbl:inherits="value=href" crop="right"/>
+    </content>
+
+    <handlers>
+      <handler event="click" phase="capturing" button="0" preventdefault="true">
+        <![CDATA[
+          var url = document.getBindingParent(this).mSourceName;
+          url = url.substring(url.lastIndexOf(" ") + 1);
+          var line = getAttribute("line");
+          gViewSourceUtils.viewSource(url, null, null, line);
+        ]]>
+      </handler>
+    </handlers>
+  </binding>
+
+</bindings>
diff --git a/toolkit/components/console/jar.mn b/toolkit/components/console/jar.mn
new file mode 100644
index 000000000..26e54c6fb
--- /dev/null
+++ b/toolkit/components/console/jar.mn
@@ -0,0 +1,9 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+toolkit.jar:
+   content/global/console.js                            (content/console.js)
+   content/global/console.xul                           (content/console.xul)
+   content/global/console.css                           (content/console.css)
+   content/global/consoleBindings.xml                   (content/consoleBindings.xml)
diff --git a/toolkit/components/console/jsconsole-clhandler.js b/toolkit/components/console/jsconsole-clhandler.js
new file mode 100644
index 000000000..7e5d0ea51
--- /dev/null
+++ b/toolkit/components/console/jsconsole-clhandler.js
@@ -0,0 +1,40 @@
+/* -*- indent-tabs-mode: nil; js-indent-level: 4 -*- */
+/* vim:sw=4:sr:sta:et:sts: */
+
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+const Cc = Components.classes;
+const Ci = Components.interfaces;
+Components.utils.import("resource://gre/modules/XPCOMUtils.jsm");
+
+function jsConsoleHandler() {}
+jsConsoleHandler.prototype = {
+  handle: function clh_handle(cmdLine) {
+    if (!cmdLine.handleFlag("jsconsole", false))
+      return;
+
+    var wm = Cc["@mozilla.org/appshell/window-mediator;1"].
+             getService(Ci.nsIWindowMediator);
+    var console = wm.getMostRecentWindow("global:console");
+    if (!console) {
+      var wwatch = Cc["@mozilla.org/embedcomp/window-watcher;1"].
+                   getService(Ci.nsIWindowWatcher);
+      wwatch.openWindow(null, "chrome://global/content/console.xul", "_blank",
+                        "chrome,dialog=no,all", cmdLine);
+    } else {
+      console.focus(); // the Error console was already open
+    }
+
+    if (cmdLine.state == Ci.nsICommandLine.STATE_REMOTE_AUTO)
+      cmdLine.preventDefault = true;
+  },
+
+  helpInfo : "  -jsconsole                          Open the Error console.\n",
+
+  classID: Components.ID("{2cd0c310-e127-44d0-88fc-4435c9ab4d4b}"),
+  QueryInterface: XPCOMUtils.generateQI([Ci.nsICommandLineHandler]),
+};
+
+this.NSGetFactory = XPCOMUtils.generateNSGetFactory([jsConsoleHandler]);
diff --git a/toolkit/components/console/jsconsole-clhandler.manifest b/toolkit/components/console/jsconsole-clhandler.manifest
new file mode 100644
index 000000000..8e8c9b8bb
--- /dev/null
+++ b/toolkit/components/console/jsconsole-clhandler.manifest
@@ -0,0 +1,3 @@
+component {2cd0c310-e127-44d0-88fc-4435c9ab4d4b} jsconsole-clhandler.js
+contract @mozilla.org/toolkit/console-clh;1 {2cd0c310-e127-44d0-88fc-4435c9ab4d4b}
+category command-line-handler b-jsconsole @mozilla.org/toolkit/console-clh;1
diff --git a/toolkit/components/console/moz.build b/toolkit/components/console/moz.build
new file mode 100644
index 000000000..d730b9aa3
--- /dev/null
+++ b/toolkit/components/console/moz.build
@@ -0,0 +1,14 @@
+# -*- Mode: python; c-basic-offset: 4; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+MOCHITEST_CHROME_MANIFESTS += ['tests/chrome.ini']
+
+EXTRA_COMPONENTS += [
+    'jsconsole-clhandler.js',
+    'jsconsole-clhandler.manifest',
+]
+
+JAR_MANIFESTS += ['jar.mn']
diff --git a/toolkit/components/console/tests/chrome.ini b/toolkit/components/console/tests/chrome.ini
new file mode 100644
index 000000000..0480c3533
--- /dev/null
+++ b/toolkit/components/console/tests/chrome.ini
@@ -0,0 +1,3 @@
+[DEFAULT]
+
+[test_hugeURIs.xul]
diff --git a/toolkit/components/console/tests/test_hugeURIs.xul b/toolkit/components/console/tests/test_hugeURIs.xul
new file mode 100644
index 000000000..87a571e8d
--- /dev/null
+++ b/toolkit/components/console/tests/test_hugeURIs.xul
@@ -0,0 +1,64 @@
+<?xml version="1.0"?>
+<?xml-stylesheet type="text/css" href="chrome://global/skin"?>
+<?xml-stylesheet type="text/css" href="chrome://mochikit/content/tests/SimpleTest/test.css"?>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=796179
+-->
+<window title="Mozilla Bug 796179"
+        xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
+        onload="RunTest();">
+  <script type="application/javascript" src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"/>
+
+  <!-- Detect severe performance and memory issues when large amounts of errors
+       are reported from CSS embedded in a file with a long data URI. Addressed
+       by 786108 for issues internal to the style system and by 796179 for issues
+       related to the error console. This error console test should finish quickly
+       with those patches and run for a very long time or OOM otherwise. -->
+
+  <!-- test results are displayed in the html:body -->
+  <body xmlns="http://www.w3.org/1999/xhtml">
+    <a href="https://bugzilla.mozilla.org/show_bug.cgi?id=796179"
+      target="_blank">Mozilla Bug 796179</a>
+    <div id="badSVG" style="max-width: 1; max-height: 1; overflow: hidden"></div>
+  </body>
+
+  <!-- display the error console so we can test its reaction to the test -->
+  <iframe id="errorConsoleFrame"  height="400" src="chrome://global/content/console.xul"></iframe>
+
+  <!-- test code -->
+  <script type="application/javascript">
+  <![CDATA[
+    function RunTest()
+    {
+      // Create the bad SVG and add it to the document.
+      var img = new Array;
+      img.push('<img src="data:image/svg+xml,');
+      img.push(encodeURIComponent('<svg xmlns="http://www.w3.org/2000/svg" width="300px" height="300px">'));
+
+      for (var i = 0 ; i < 10000 ; i++)
+        img.push(encodeURIComponent('<circle cx="0" cy="0" r="1" style="xxx-invalid-property: 0;"/>'));
+
+      img.push(encodeURIComponent('</svg>'));
+      img.push('" />');
+
+      document.getElementById('badSVG').innerHTML = img.join('');
+
+      // We yield control of the thread, allowing the error console to render.
+      // If we get control back without timing out or OOMing then the test passed.
+      SimpleTest.waitForExplicitFinish();
+      SimpleTest.executeSoon(function() {
+                               // Clean up.
+                               var elem = document.getElementById('errorConsoleFrame');
+                               elem.parentNode.removeChild(elem);
+                               elem = document.getElementById('badSVG');
+                               elem.parentNode.removeChild(elem);
+                               elem = null;
+
+                               // Finish the test with a pass.
+                               ok(true, 'Error console rendered OK.');
+                               SimpleTest.finish();
+                             }, 0);
+    }
+  ]]>
+  </script>
+</window>
-- 
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