diff --git a/demo/editor.html b/demo/editor.html
index 6505694e..c0bdfb1d 100644
--- a/demo/editor.html
+++ b/demo/editor.html
@@ -20,9 +20,12 @@
 	<link rel="stylesheet" href="../css/editor.css" type="text/css" charset="utf-8">
 	
 	<script src="../src/ace.js" type="text/javascript" charset="utf-8"></script>
+	<script src="../src/mode/Text.js" type="text/javascript" charset="utf-8"></script>
+	<script src="../src/mode/JavaScript.js" type="text/javascript" charset="utf-8"></script>
+	<script src="../src/mode/JavaScriptHighlightRules.js" type="text/javascript" charset="utf-8"></script>
+	<script src="../src/mode/Xml.js" type="text/javascript" charset="utf-8"></script>
+	<script src="../src/mode/XmlHighlightRules.js" type="text/javascript" charset="utf-8"></script>
 	<script src="../src/TextDocument.js" type="text/javascript" charset="utf-8"></script>
-	<script src="../src/JavaScript.js" type="text/javascript" charset="utf-8"></script>
-	<script src="../src/XML.js" type="text/javascript" charset="utf-8"></script>
 	<script src="../src/Tokenizer.js" type="text/javascript" charset="utf-8"></script>
 	<script src="../src/BackgroundTokenizer.js" type="text/javascript" charset="utf-8"></script>
 	<script src="../src/CursorLayer.js" type="text/javascript" charset="utf-8"></script>	
@@ -42,7 +45,11 @@
 <script type="text/javascript" charset="utf-8">
 
 var container = document.getElementById("container");
-var editor = new ace.Editor(new ace.TextDocument("Juhu Kinners"), new ace.VirtualRenderer(container));
+var editor = new ace.Editor(
+    new ace.VirtualRenderer(container),
+    new ace.TextDocument("Juhu Kinners"),
+    new ace.mode.JavaScript()
+);
 
 window.onresize = function() {
   editor.resize();
diff --git a/jsTestDriver.conf b/jsTestDriver.conf
index 5ce7df71..0a1df7c2 100644
--- a/jsTestDriver.conf
+++ b/jsTestDriver.conf
@@ -2,5 +2,8 @@
 server: http://localhost:4224
 
 load:
+  - src/ace.js
+  - src/mode/Text.js
+  - src/mode/*.js
   - src/*.js
   - test/*.js
\ No newline at end of file
diff --git a/src/Editor.js b/src/Editor.js
index 58353809..af71ed83 100644
--- a/src/Editor.js
+++ b/src/Editor.js
@@ -1,9 +1,12 @@
 ace.provide("ace.Editor");
 
-ace.Editor = function(doc, renderer) {
+ace.Editor = function(renderer, doc, mode) {
     var container = renderer.getContainerElement();
     this.renderer = renderer;
 
+    this.setDocument(doc || new ace.TextDocument(""));
+    this.setMode(mode || new ace.mode.Text());
+
     this.textInput = new ace.TextInput(container, this);
     new ace.KeyBinding(container, this);
 
@@ -15,16 +18,6 @@ ace.Editor = function(doc, renderer) {
     ace.addTripleClickListener(container, ace.bind(this.selectLine,
                                                    this));
 
-    this.doc = doc;
-    doc.addChangeListener(ace.bind(this.onDocumentChange, this));
-    renderer.setDocument(doc);
-
-    this.tokenizer = new ace.BackgroundTokenizer(new ace.Tokenizer(
-            ace.JavaScript.RULES), ace.bind(this.onTokenizerUpdate, this));
-
-    this.tokenizer.setLines(doc.lines);
-    renderer.setTokenizer(this.tokenizer);
-
     this.cursor = {
         row : 0,
         column : 0
@@ -37,6 +30,31 @@ ace.Editor = function(doc, renderer) {
     this.renderer.draw();
 };
 
+ace.Editor.prototype.setDocument = function(doc) {
+    // TODO: document change is not yet supported
+    if (this.doc) {
+        throw new Error("TODO: document change is not yet supported");
+    }
+
+    this.doc = doc;
+    doc.addChangeListener(ace.bind(this.onDocumentChange, this));
+    this.renderer.setDocument(doc);
+};
+
+ace.Editor.prototype.setMode = function(mode) {
+    // TODO: mode change is not yet supported
+    if (this.mode) {
+        throw new Error("TODO: mode change is not yet supported");
+    }
+
+    this.mode = mode;
+
+    this.tokenizer = new ace.BackgroundTokenizer(mode.getTokenizer(), ace.bind(this.onTokenizerUpdate, this));
+
+    this.tokenizer.setLines(this.doc.lines);
+    this.renderer.setTokenizer(this.tokenizer);
+};
+
 ace.Editor.prototype.resize = function()
 {
     this.renderer.scrollToY(this.renderer.getScrollTop());
diff --git a/src/JavaScript.js b/src/JavaScript.js
deleted file mode 100644
index f6747ffe..00000000
--- a/src/JavaScript.js
+++ /dev/null
@@ -1,111 +0,0 @@
-ace.provide("ace.JavaScript");
-
-(function() {
-
-var keywords = {
-    "break" : 1,
-    "case" : 1,
-    "catch" : 1,
-    "continue" : 1,
-    "default" : 1,
-    "delete" : 1,
-    "do" : 1,
-    "else" : 1,
-    "finally" : 1,
-    "for" : 1,
-    "function" : 1,
-    "if" : 1,
-    "in" : 1,
-    "instanceof" : 1,
-    "new" : 1,
-    "return" : 1,
-    "switch" : 1,
-    "throw" : 1,
-    "try" : 1,
-    "typeof" : 1,
-    "var" : 1,
-    "while" : 1,
-    "with" : 1
-};
-
-// regexp must not have capturing parentheses
-// regexps are ordered -> the first match is used
-
-ace.JavaScript.RULES = {
-    start : [ {
-        token : "comment",
-        regex : "\\/\\/.*$"
-    }, {
-        token : "comment", // multi line comment in one line
-        regex : "\\/\\*.*?\\*\\/"
-    }, {
-        token : "comment", // multi line comment start
-        regex : "\\/\\*.*$",
-        next : "comment"
-    }, {
-        token : "string", // single line
-        regex : '["](?:(?:\\\\.)|(?:[^"\\\\]))*?["]'
-    }, {
-        token : "string", // multi line string start
-        regex : '["].*\\\\$',
-        next : "qqstring"
-    }, {
-        token : "string", // single line
-        regex : "['](?:(?:\\\\.)|(?:[^'\\\\]))*?[']"
-    }, {
-        token : "string", // multi line string start
-        regex : "['].*\\\\$",
-        next : "qstring"
-    }, {
-        token : "number", // hex
-        regex : "0[xX][0-9a-fA-F]+\\b"
-    }, {
-        token : "number", // float
-        regex : "[+-]?\\d+(?:(?:\\.\\d*)?(?:[eE][+-]?\\d+)?)?\\b"
-    }, {
-        token : function(value) {
-            if (keywords[value]) {
-                return "keyword";
-            }
-            else {
-                return "identifier";
-            }
-        },
-        regex : "[a-zA-Z_][a-zA-Z0-9_]*\\b"
-    }, {
-        token : function(value) {
-            // return parens[value];
-        return "text";
-    },
-    regex : "[\\[\\]\\(\\)\\{\\}]"
-    }, {
-        token : "text",
-        regex : "\\s+"
-    } ],
-    "comment" : [ {
-        token : "comment", // closing comment
-        regex : ".*?\\*\\/",
-        next : "start"
-    }, {
-        token : "comment", // comment spanning whole line
-        regex : ".+"
-    } ],
-    "qqstring" : [ {
-        token : "string",
-        regex : '(?:(?:\\\\.)|(?:[^"\\\\]))*?"',
-        next : "start"
-    }, {
-        token : "string",
-        regex : '.+'
-    } ],
-    "qstring" : [ {
-        token : "string",
-        regex : "(?:(?:\\\\.)|(?:[^'\\\\]))*?'",
-        next : "start"
-    }, {
-        token : "string",
-        regex : '.+'
-    } ]
-};
-
-})();
\ No newline at end of file
diff --git a/src/XML.js b/src/XML.js
deleted file mode 100644
index 842f4497..00000000
--- a/src/XML.js
+++ /dev/null
@@ -1,72 +0,0 @@
-ace.provide("ace.XML");
-
-(function() {
-
-// regexp must not have capturing parentheses
-// regexps are ordered -> the first match is used
-
-ace.XML.RULES = {
-    start : [ {
-        token : "text",
-        regex : "<\\!\\[CDATA\\[",
-        next : "cdata"
-    }, {
-        token : "xml_pe",
-        regex : "<\\?.*?\\?>"
-    }, {
-        token : "comment",
-        regex : "<\\!--",
-        next : "comment"
-    }, {
-        token : "text", // opening tag
-        regex : "<",
-        next : "tag"
-    }, {
-        token : "text",
-        regex : "\\s+"
-    }, {
-        token : "text",
-        regex : ".+"
-    } ],
-
-    tag : [ {
-        token : "text",
-        regex : ">",
-        next : "start"
-    }, {
-        token : "keyword",
-        regex : "[-_a-zA-Z0-9:]+"
-    }, {
-        token : "text",
-        regex : "\\s+"
-    }, {
-        token : "string",
-        regex : '".*?"'
-    }, {
-        token : "string",
-        regex : "'.*?'"
-    } ],
-
-    cdata : [ {
-        token : "text",
-        regex : "\\]\\]>",
-        next : "start"
-    }, {
-        token : "text",
-        regex : "\\s+"
-    }, {
-        token : "text",
-        regex : ".+"
-    } ],
-
-    comment : [ {
-        token : "comment",
-        regex : ".*?-->",
-        next : "start"
-    }, {
-        token : "comment",
-        regex : ".+"
-    } ]
-};
-
-})();
\ No newline at end of file
diff --git a/src/ace.js b/src/ace.js
index ebcef88a..4a938586 100644
--- a/src/ace.js
+++ b/src/ace.js
@@ -13,6 +13,14 @@ ace.provide = function(namespace) {
     }
 };
 
+ace.inherits = function(ctor, superCtor) {
+    var tempCtor = function() {};
+    tempCtor.prototype = superCtor.prototype;
+    ctor.super_ = superCtor.prototype;
+    ctor.prototype = new tempCtor();
+    ctor.prototype.constructor = ctor;
+};
+
 ace.addListener = function(elem, type, callback) {
     if (elem.addEventListener) {
         return elem.addEventListener(type, callback, false);
@@ -64,14 +72,6 @@ ace.preventDefault = function(e) {
         e.returnValue = false;
 };
 
-ace.inherits = function(ctor, superCtor) {
-    var tempCtor = function() {};
-    tempCtor.prototype = superCtor.prototype;
-    ctor.super_ = superCtor.prototype;
-    ctor.prototype = new tempCtor();
-    ctor.prototype.constructor = ctor;
-};
-
 ace.getInnerWidth = function(element) {
     return (parseInt(ace.computedStyle(element, "paddingLeft"))
             + parseInt(ace.computedStyle(element, "paddingRight")) + element.clientWidth);
diff --git a/src/mode/JavaScript.js b/src/mode/JavaScript.js
new file mode 100644
index 00000000..0f6003a6
--- /dev/null
+++ b/src/mode/JavaScript.js
@@ -0,0 +1,7 @@
+ace.provide("ace.mode.JavaScript");
+
+ace.mode.JavaScript = function() {
+    this.$tokenizer = new ace.Tokenizer(new ace.mode.JavaScriptHighlightRules().getRules());
+};
+ace.inherits(ace.mode.JavaScript, ace.mode.Text);
+
diff --git a/src/mode/JavaScriptHighlightRules.js b/src/mode/JavaScriptHighlightRules.js
new file mode 100644
index 00000000..6c366559
--- /dev/null
+++ b/src/mode/JavaScriptHighlightRules.js
@@ -0,0 +1,114 @@
+ace.provide("ace.mode.JavaScriptHighlightRules");
+
+ace.mode.JavaScriptHighlightRules = function() {
+
+    var keywords = {
+        "break" : 1,
+        "case" : 1,
+        "catch" : 1,
+        "continue" : 1,
+        "default" : 1,
+        "delete" : 1,
+        "do" : 1,
+        "else" : 1,
+        "finally" : 1,
+        "for" : 1,
+        "function" : 1,
+        "if" : 1,
+        "in" : 1,
+        "instanceof" : 1,
+        "new" : 1,
+        "return" : 1,
+        "switch" : 1,
+        "throw" : 1,
+        "try" : 1,
+        "typeof" : 1,
+        "var" : 1,
+        "while" : 1,
+        "with" : 1
+    };
+
+    // regexp must not have capturing parentheses. Use (?:) instead.
+    // regexps are ordered -> the first match is used
+
+    this._rules = {
+        start : [ {
+            token : "comment",
+            regex : "\\/\\/.*$"
+        }, {
+            token : "comment", // multi line comment in one line
+            regex : "\\/\\*.*?\\*\\/"
+        }, {
+            token : "comment", // multi line comment start
+            regex : "\\/\\*.*$",
+            next : "comment"
+        }, {
+            token : "string", // single line
+            regex : '["](?:(?:\\\\.)|(?:[^"\\\\]))*?["]'
+        }, {
+            token : "string", // multi line string start
+            regex : '["].*\\\\$',
+            next : "qqstring"
+        }, {
+            token : "string", // single line
+            regex : "['](?:(?:\\\\.)|(?:[^'\\\\]))*?[']"
+        }, {
+            token : "string", // multi line string start
+            regex : "['].*\\\\$",
+            next : "qstring"
+        }, {
+            token : "number", // hex
+            regex : "0[xX][0-9a-fA-F]+\\b"
+        }, {
+            token : "number", // float
+            regex : "[+-]?\\d+(?:(?:\\.\\d*)?(?:[eE][+-]?\\d+)?)?\\b"
+        }, {
+            token : function(value) {
+                if (keywords[value]) {
+                    return "keyword";
+                }
+                else {
+                    return "identifier";
+                }
+            },
+            regex : "[a-zA-Z_][a-zA-Z0-9_]*\\b"
+        }, {
+            token : function(value) {
+                // return parens[value];
+            return "text";
+        },
+        regex : "[\\[\\]\\(\\)\\{\\}]"
+        }, {
+            token : "text",
+            regex : "\\s+"
+        } ],
+        "comment" : [ {
+            token : "comment", // closing comment
+            regex : ".*?\\*\\/",
+            next : "start"
+        }, {
+            token : "comment", // comment spanning whole line
+            regex : ".+"
+        } ],
+        "qqstring" : [ {
+            token : "string",
+            regex : '(?:(?:\\\\.)|(?:[^"\\\\]))*?"',
+            next : "start"
+        }, {
+            token : "string",
+            regex : '.+'
+        } ],
+        "qstring" : [ {
+            token : "string",
+            regex : "(?:(?:\\\\.)|(?:[^'\\\\]))*?'",
+            next : "start"
+        }, {
+            token : "string",
+            regex : '.+'
+        } ]
+    };
+};
+
+ace.mode.JavaScriptHighlightRules.prototype.getRules = function() {
+    return this._rules;
+};
\ No newline at end of file
diff --git a/src/mode/Text.js b/src/mode/Text.js
new file mode 100644
index 00000000..c48f4cf1
--- /dev/null
+++ b/src/mode/Text.js
@@ -0,0 +1,9 @@
+ace.provide("ace.mode.Text");
+
+ace.mode.Text = function() {
+    this.$tokenizer = new ace.Tokenizer({});
+};
+
+ace.mode.Text.prototype.getTokenizer = function() {
+    return this.$tokenizer;
+};
\ No newline at end of file
diff --git a/src/mode/Xml.js b/src/mode/Xml.js
new file mode 100644
index 00000000..23ccc4b1
--- /dev/null
+++ b/src/mode/Xml.js
@@ -0,0 +1,6 @@
+ace.provide("ace.mode.Xml");
+
+ace.mode.Xml = function() {
+    this.$tokenizer = new Tokenizer(new ace.mode.XmlHighlightRules().getRules());
+};
+ace.inherits(ace.mode.Xml, ace.mode.Text);
diff --git a/src/mode/XmlHighlightRules.js b/src/mode/XmlHighlightRules.js
new file mode 100644
index 00000000..1ec228d2
--- /dev/null
+++ b/src/mode/XmlHighlightRules.js
@@ -0,0 +1,75 @@
+ace.provide("ace.mode.XmlHighlightRules");
+
+ace.mode.XmlHighlightRules = function() {
+
+    // regexp must not have capturing parentheses
+    // regexps are ordered -> the first match is used
+
+    this._rules = {
+        start : [ {
+            token : "text",
+            regex : "<\\!\\[CDATA\\[",
+            next : "cdata"
+        }, {
+            token : "xml_pe",
+            regex : "<\\?.*?\\?>"
+        }, {
+            token : "comment",
+            regex : "<\\!--",
+            next : "comment"
+        }, {
+            token : "text", // opening tag
+            regex : "<",
+            next : "tag"
+        }, {
+            token : "text",
+            regex : "\\s+"
+        }, {
+            token : "text",
+            regex : ".+"
+        } ],
+
+        tag : [ {
+            token : "text",
+            regex : ">",
+            next : "start"
+        }, {
+            token : "keyword",
+            regex : "[-_a-zA-Z0-9:]+"
+        }, {
+            token : "text",
+            regex : "\\s+"
+        }, {
+            token : "string",
+            regex : '".*?"'
+        }, {
+            token : "string",
+            regex : "'.*?'"
+        } ],
+
+        cdata : [ {
+            token : "text",
+            regex : "\\]\\]>",
+            next : "start"
+        }, {
+            token : "text",
+            regex : "\\s+"
+        }, {
+            token : "text",
+            regex : ".+"
+        } ],
+
+        comment : [ {
+            token : "comment",
+            regex : ".*?-->",
+            next : "start"
+        }, {
+            token : "comment",
+            regex : ".+"
+        } ]
+    };
+};
+
+ace.mode.XmlHighlightRules.prototype.getRules = function() {
+    return this._rules;
+};
\ No newline at end of file
diff --git a/test/NavigationTest.js b/test/NavigationTest.js
index 1d71fc0e..e6b779cc 100644
--- a/test/NavigationTest.js
+++ b/test/NavigationTest.js
@@ -7,16 +7,16 @@ var NavigationTest = TestCase("NavigationTest",
     },
 
     "test: navigate to end of file should place the cursor on last row and column" : function() {
-        var editor = new ace.Editor(this.createTextDocument(200, 10),
-                new MockRenderer());
+        var doc = this.createTextDocument(200, 10);
+        var editor = new ace.Editor(new MockRenderer(), doc);
 
         editor.navigateFileEnd();
         assertPosition(199, 10, editor.getCursorPosition());
     },
 
     "test: navigate to end of file should scroll the last line into view" : function() {
-        var editor = new ace.Editor(this.createTextDocument(200, 10),
-                new MockRenderer());
+        var doc = this.createTextDocument(200, 10);
+        var editor = new ace.Editor(new MockRenderer(), doc);
 
         editor.navigateFileEnd();
         var cursor = editor.getCursorPosition();
@@ -26,16 +26,16 @@ var NavigationTest = TestCase("NavigationTest",
     },
 
     "test: navigate to start of file should place the cursor on the first row and column" : function() {
-        var editor = new ace.Editor(this.createTextDocument(200, 10),
-                new MockRenderer());
+        var doc = this.createTextDocument(200, 10);
+        var editor = new ace.Editor(new MockRenderer(), doc);
 
         editor.navigateFileStart();
         assertPosition(0, 0, editor.getCursorPosition());
     },
 
     "test: navigate to start of file should scroll the first row into view" : function() {
-        var editor = new ace.Editor(this.createTextDocument(200, 10),
-                new MockRenderer());
+        var doc = this.createTextDocument(200, 10);
+        var editor = new ace.Editor(new MockRenderer(), doc);
 
         editor.scrollToRow(editor.getLastVisibleRow() + 20);
         editor.navigateFileStart();
@@ -44,8 +44,8 @@ var NavigationTest = TestCase("NavigationTest",
     },
 
     "test: move selection lead to end of file" : function() {
-        var editor = new ace.Editor(this.createTextDocument(200, 10),
-                new MockRenderer());
+        var doc = this.createTextDocument(200, 10);
+        var editor = new ace.Editor(new MockRenderer(), doc);
 
         editor.moveCursorTo(100, 5);
         editor.selectFileEnd();
@@ -57,8 +57,8 @@ var NavigationTest = TestCase("NavigationTest",
     },
 
     "test: move selection lead to start of file" : function() {
-        var editor = new ace.Editor(this.createTextDocument(200, 10),
-                new MockRenderer());
+        var doc = this.createTextDocument(200, 10);
+        var editor = new ace.Editor(new MockRenderer(), doc);
 
         editor.moveCursorTo(100, 5);
         editor.selectFileStart();
@@ -72,7 +72,7 @@ var NavigationTest = TestCase("NavigationTest",
     "test: navigate word right" : function() {
         var doc = new ace.TextDocument( ["ab",
                 " Juhu Kinners (abc, 12)", " cde"].join("\n"));
-        var editor = new ace.Editor(doc, new MockRenderer());
+        var editor = new ace.Editor(new MockRenderer(), doc);
 
         editor.navigateDown();
         assertPosition(1, 0, editor.getCursorPosition());
@@ -111,7 +111,7 @@ var NavigationTest = TestCase("NavigationTest",
 
     "test: select word right if cursor in word" : function() {
         var doc = new ace.TextDocument("Juhu Kinners");
-        var editor = new ace.Editor(doc, new MockRenderer());
+        var editor = new ace.Editor(new MockRenderer(), doc);
 
         editor.moveCursorTo(0, 2);
 
@@ -122,7 +122,7 @@ var NavigationTest = TestCase("NavigationTest",
     "test: navigate word left" : function() {
         var doc = new ace.TextDocument( ["ab",
                                          " Juhu Kinners (abc, 12)", " cde"].join("\n"));
-        var editor = new ace.Editor(doc, new MockRenderer());
+        var editor = new ace.Editor(new MockRenderer(), doc);
 
         editor.navigateDown();
         editor.navigateLineEnd();
@@ -162,7 +162,7 @@ var NavigationTest = TestCase("NavigationTest",
 
     "test: select word left if cursor in word" : function() {
         var doc = new ace.TextDocument("Juhu Kinners");
-        var editor = new ace.Editor(doc, new MockRenderer());
+        var editor = new ace.Editor(new MockRenderer(), doc);
 
         editor.moveCursorTo(0, 8);
 
@@ -172,7 +172,7 @@ var NavigationTest = TestCase("NavigationTest",
 
     "test: select word right and select" : function() {
         var doc = new ace.TextDocument("Juhu Kinners");
-        var editor = new ace.Editor(doc, new MockRenderer());
+        var editor = new ace.Editor(new MockRenderer(), doc);
 
         editor.moveCursorTo(0, 0);
         editor.selectWordRight();
@@ -185,7 +185,7 @@ var NavigationTest = TestCase("NavigationTest",
 
     "test: select word left and select" : function() {
         var doc = new ace.TextDocument("Juhu Kinners");
-        var editor = new ace.Editor(doc, new MockRenderer());
+        var editor = new ace.Editor(new MockRenderer(), doc);
 
         editor.moveCursorTo(0, 3);
         editor.selectWordLeft();
@@ -197,8 +197,7 @@ var NavigationTest = TestCase("NavigationTest",
     },
 
     "test: goto hidden line should scroll the line into the middle of the viewport" : function() {
-        var editor = new ace.Editor(this.createTextDocument(200, 5),
-                new MockRenderer());
+        var editor = new ace.Editor(new MockRenderer(), this.createTextDocument(200, 5));
 
         editor.navigateTo(0, 0);
         editor.gotoLine(100);
@@ -232,8 +231,7 @@ var NavigationTest = TestCase("NavigationTest",
     },
 
     "test: goto visible line should only move the cursor and not scroll": function() {
-        var editor = new ace.Editor(this.createTextDocument(200, 5),
-                new MockRenderer());
+        var editor = new ace.Editor(new MockRenderer(), this.createTextDocument(200, 5));
 
         editor.navigateTo(0, 0);
         editor.gotoLine(11);
@@ -245,4 +243,4 @@ var NavigationTest = TestCase("NavigationTest",
         assertPosition(32, 0, editor.getCursorPosition());
         assertEquals(30, editor.getFirstVisibleRow());
     }
-});
+});
\ No newline at end of file
diff --git a/test/TextEditTest.js b/test/TextEditTest.js
index 2273995b..55f0ea4e 100644
--- a/test/TextEditTest.js
+++ b/test/TextEditTest.js
@@ -2,7 +2,7 @@ var TextEditTest = TestCase("TextEditTest",
 {
     "test: delete line from the middle" : function() {
         var doc = new ace.TextDocument(["a", "b", "c", "d"].join("\n"));
-        var editor = new ace.Editor(doc, new MockRenderer());
+        var editor = new ace.Editor(new MockRenderer(), doc);
 
         editor.moveCursorTo(1, 1);
         editor.removeLine();
@@ -13,7 +13,7 @@ var TextEditTest = TestCase("TextEditTest",
 
     "test: delete first line" : function() {
         var doc = new ace.TextDocument(["a", "b", "c"].join("\n"));
-        var editor = new ace.Editor(doc, new MockRenderer());
+        var editor = new ace.Editor(new MockRenderer(), doc);
 
         editor.removeLine();
 
@@ -23,7 +23,7 @@ var TextEditTest = TestCase("TextEditTest",
 
     "test: delete last" : function() {
         var doc = new ace.TextDocument(["a", "b", "c"].join("\n"));
-        var editor = new ace.Editor(doc, new MockRenderer());
+        var editor = new ace.Editor(new MockRenderer(), doc);
 
         editor.moveCursorTo(2, 1);
         editor.removeLine();
@@ -34,7 +34,7 @@ var TextEditTest = TestCase("TextEditTest",
 
     "test: indent block" : function() {
         var doc = new ace.TextDocument(["a12345", "b12345", "c12345"].join("\n"));
-        var editor = new ace.Editor(doc, new MockRenderer());
+        var editor = new ace.Editor(new MockRenderer(), doc);
 
         editor.moveCursorTo(1, 3);
         editor.selectDown();
@@ -51,7 +51,7 @@ var TextEditTest = TestCase("TextEditTest",
 
     "test: outdent block" : function() {
         var doc = new ace.TextDocument(["    a12345", "  b12345", "    c12345"].join("\n"));
-        var editor = new ace.Editor(doc, new MockRenderer());
+        var editor = new ace.Editor(new MockRenderer(), doc);
 
         editor.moveCursorTo(0, 3);
         editor.selectDown();