add a keycodes structure to utils

    this structure (IPython.utils.keycodes)
    add some common keycodes like tab...etc

    and start modifying codecell.js to use it for better readability

IPython/frontend/html/notebook/static/js/codecell.js

@@ -1,691 +1,692
 //----------------------------------------------------------------------------
 //  Copyright (C) 2008-2011  The IPython Development Team
 //
 //  Distributed under the terms of the BSD License.  The full license is in
 //  the file COPYING, distributed as part of this software.
 //----------------------------------------------------------------------------
 
 //============================================================================
 // CodeCell
 //============================================================================
 
 var IPython = (function (IPython) {
     "use strict";
 
     var utils = IPython.utils;
+    var key   = IPython.utils.keycodes;
 
     var CodeCell = function (notebook) {
         this.code_mirror = null;
         this.input_prompt_number = null;
         this.is_completing = false;
         this.completion_cursor = null;
         this.outputs = [];
         this.collapsed = false;
         this.tooltip_timeout = null;
         this.clear_out_timeout = null;
         IPython.Cell.apply(this, arguments);
     };
 
 
     CodeCell.prototype = new IPython.Cell();
 
 
     CodeCell.prototype.create_element = function () {
         var cell =  $('<div></div>').addClass('cell border-box-sizing code_cell vbox');
         cell.attr('tabindex','2');
         var input = $('<div></div>').addClass('input hbox');
         input.append($('<div/>').addClass('prompt input_prompt'));
         var input_area = $('<div/>').addClass('input_area box-flex1');
         this.code_mirror = CodeMirror(input_area.get(0), {
             indentUnit : 4,
             mode: 'python',
             theme: 'ipython',
             readOnly: this.read_only,
             onKeyEvent: $.proxy(this.handle_codemirror_keyevent,this)
         });
         input.append(input_area);
         var output = $('<div></div>').addClass('output vbox');
         cell.append(input).append(output);
         this.element = cell;
         this.collapse();
 
         // construct a completer
         // And give it the function to call to get the completion list
         var that = this;
         this.completer = new IPython.Completer(this.code_mirror,function(callback){that.requestCompletion(callback)});
     };
 
     //TODO, try to diminish the number of parameters.
     CodeCell.prototype.request_tooltip_after_time = function (pre_cursor,time){
         var that = this;
         if (pre_cursor === "" || pre_cursor === "(" ) {
             // don't do anything if line beggin with '(' or is empty
         } else {
             // Will set a timer to request tooltip in `time`
             that.tooltip_timeout = setTimeout(function(){
                     IPython.notebook.request_tool_tip(that, pre_cursor)
                 },time);
         }
     };
 
     CodeCell.prototype.handle_codemirror_keyevent = function (editor, event) {
         // This method gets called in CodeMirror's onKeyDown/onKeyPress
         // handlers and is used to provide custom key handling. Its return
         // value is used to determine if CodeMirror should ignore the event:
         // true = ignore, false = don't ignore.
         
         if (this.read_only){
             return false;
         }
         
         // note that we are comparing and setting the time to wait at each key press.
         // a better wqy might be to generate a new function on each time change and
         // assign it to CodeCell.prototype.request_tooltip_after_time
         var tooltip_wait_time = this.notebook.time_before_tooltip;
         var tooltip_on_tab    = this.notebook.tooltip_on_tab;
         var that = this;
         // whatever key is pressed, first, cancel the tooltip request before
         // they are sent, and remove tooltip if any
         if(event.type === 'keydown' ) {
             that.remove_and_cancel_tooltip();
         };
 
 
         if (event.keyCode === 13 && (event.shiftKey || event.ctrlKey)) {
             // Always ignore shift-enter in CodeMirror as we handle it.
             return true;
         } else if (event.which === 40 && event.type === 'keypress' && tooltip_wait_time >= 0) {
             // triger aon keypress (!) otherwise inconsistent event.which depending on plateform
             // browser and keyboard layout !
             // Pressing '(' , request tooltip, don't forget to reappend it
             var cursor = editor.getCursor();
             var pre_cursor = editor.getRange({line:cursor.line,ch:0},cursor).trim()+'(';
             that.request_tooltip_after_time(pre_cursor,tooltip_wait_time);
-        } else if (event.which === 38) {
+        } else if (event.which === key.upArrow) {
             // If we are not at the top, let CM handle the up arrow and
             // prevent the global keydown handler from handling it.
             if (!that.at_top()) {
                 event.stop();
                 return false;
             } else {
                 return true; 
             };
-        } else if (event.which === 40) {
+        } else if (event.which === key.downArrow) {
             // If we are not at the bottom, let CM handle the down arrow and
             // prevent the global keydown handler from handling it.
             if (!that.at_bottom()) {
                 event.stop();
                 return false;
             } else {
                 return true; 
             };
-        } else if (event.keyCode === 9 && event.type == 'keydown') {
+        } else if (event.keyCode === key.tab && event.type == 'keydown') {
             // Tab completion.
             var cur = editor.getCursor();
             //Do not trim here because of tooltip
             var pre_cursor = editor.getRange({line:cur.line,ch:0},cur);
             if (pre_cursor.trim() === "") {
                 // Don't autocomplete if the part of the line before the cursor
                 // is empty.  In this case, let CodeMirror handle indentation.
                 return false;
             } else if ((pre_cursor.substr(-1) === "("|| pre_cursor.substr(-1) === " ") && tooltip_on_tab ) {
                 that.request_tooltip_after_time(pre_cursor,0);
                 // Prevent the event from bubbling up.
                 event.stop();
                 // Prevent CodeMirror from handling the tab.
                 return true;
             } else {
                 event.stop();
                 this.completer.startCompletion();
                 return true;
             };
-        } else if (event.keyCode === 8 && event.type == 'keydown') {
+        } else if (event.keyCode === key.backspace && event.type == 'keydown') {
             // If backspace and the line ends with 4 spaces, remove them.
             var cur = editor.getCursor();
             var line = editor.getLine(cur.line);
             var ending = line.slice(-4);
             if (ending === '    ') {
                 editor.replaceRange('',
                     {line: cur.line, ch: cur.ch-4},
                     {line: cur.line, ch: cur.ch}
                 );
                 event.stop();
                 return true;
             } else {
                 return false;
             };
         } else {
             // keypress/keyup also trigger on TAB press, and we don't want to
             // use those to disable tab completion.
-            if (this.is_completing && event.keyCode !== 9) {
+            if (this.is_completing && event.keyCode !== key.tab) {
                 var ed_cur = editor.getCursor();
                 var cc_cur = this.completion_cursor;
                 if (ed_cur.line !== cc_cur.line || ed_cur.ch !== cc_cur.ch) {
                     this.is_completing = false;
                     this.completion_cursor = null;
                 };
             };
             return false;
         };
         return false;
     };
 
     CodeCell.prototype.remove_and_cancel_tooltip = function() {
         // note that we don't handle closing directly inside the calltip
         // as in the completer, because it is not focusable, so won't
         // get the event.
         if (this.tooltip_timeout != null){
             clearTimeout(this.tooltip_timeout);
             $('#tooltip').remove();
             this.tooltip_timeout = null;
         }
     }
 
     CodeCell.prototype.finish_tooltip = function (reply) {
         // Extract call tip data; the priority is call, init, main.
         defstring = reply.call_def;
         if (defstring == null) { defstring = reply.init_definition; }
         if (defstring == null) { defstring = reply.definition; }
 
         docstring = reply.call_docstring;
         if (docstring == null) { docstring = reply.init_docstring; }
         if (docstring == null) { docstring = reply.docstring; }
         if (docstring == null) { docstring = "<empty docstring>"; }
 
         name=reply.name;
 
         var that = this;
         var tooltip = $('<div/>').attr('id', 'tooltip').addClass('tooltip');
         // remove to have the tooltip not Limited in X and Y
         tooltip.addClass('smalltooltip');
         var pre=$('<pre/>').html(utils.fixConsole(docstring));
         var expandlink=$('<a/>').attr('href',"#");
             expandlink.addClass("ui-corner-all"); //rounded corner
             expandlink.attr('role',"button");
             //expandlink.addClass('ui-button');
             //expandlink.addClass('ui-state-default');
         var expandspan=$('<span/>').text('Expand');
             expandspan.addClass('ui-icon');
             expandspan.addClass('ui-icon-plus');
         expandlink.append(expandspan);
         expandlink.attr('id','expanbutton');
         expandlink.click(function(){
             tooltip.removeClass('smalltooltip');
             tooltip.addClass('bigtooltip');
             $('#expanbutton').remove();
             setTimeout(function(){that.code_mirror.focus();}, 50);
         });
         var morelink=$('<a/>').attr('href',"#");
             morelink.attr('role',"button");
             morelink.addClass('ui-button');
             //morelink.addClass("ui-corner-all"); //rounded corner
             //morelink.addClass('ui-state-default');
         var morespan=$('<span/>').text('Open in Pager');
             morespan.addClass('ui-icon');
             morespan.addClass('ui-icon-arrowstop-l-n');
         morelink.append(morespan);
         morelink.click(function(){
             var msg_id = IPython.notebook.kernel.execute(name+"?");
             IPython.notebook.msg_cell_map[msg_id] = IPython.notebook.get_selected_cell().cell_id;
             that.remove_and_cancel_tooltip();
             setTimeout(function(){that.code_mirror.focus();}, 50);
         });
 
         var closelink=$('<a/>').attr('href',"#");
             closelink.attr('role',"button");
             closelink.addClass('ui-button');
             //closelink.addClass("ui-corner-all"); //rounded corner
             //closelink.adClass('ui-state-default'); // grey background and blue cross
         var closespan=$('<span/>').text('Close');
             closespan.addClass('ui-icon');
             closespan.addClass('ui-icon-close');
         closelink.append(closespan);
         closelink.click(function(){
             that.remove_and_cancel_tooltip();
             setTimeout(function(){that.code_mirror.focus();}, 50);
             });
         //construct the tooltip
         tooltip.append(closelink);
         tooltip.append(expandlink);
         tooltip.append(morelink);
         if(defstring){
             defstring_html = $('<pre/>').html(utils.fixConsole(defstring));
             tooltip.append(defstring_html);
         }
         tooltip.append(pre);
         var pos = this.code_mirror.cursorCoords();
         tooltip.css('left',pos.x+'px');
         tooltip.css('top',pos.yBot+'px');
         $('body').append(tooltip);
 
         // issues with cross-closing if multiple tooltip in less than 5sec
         // keep it comented for now
         // setTimeout(that.remove_and_cancel_tooltip, 5000);
     };
 
     // As you type completer
     // this should be called by the completer, that in return will
     // be reclled by finish_completing
     CodeCell.prototype.requestCompletion= function(callback)
     {
         this._compcallback = callback;
         var cur = this.code_mirror.getCursor();
         var pre_cursor = this.code_mirror.getRange({line:cur.line,ch:0},cur);
         pre_cursor.trim();
         // Autocomplete the current line.
         var line = this.code_mirror.getLine(cur.line);
         this.is_completing = true;
         this.completion_cursor = cur;
         // one could fork here and directly call finish completing
         // if kernel is busy
         IPython.notebook.complete_cell(this, line, cur.ch);
     }
 
     // called when completion came back from the kernel. this will inspect the
     // curent cell for (more) completion merge the resuults with the ones
     // comming from the kernel and forward it to the completer
     CodeCell.prototype.finish_completing = function (matched_text, matches) {
         // let's build a function that wrap all that stuff into what is needed for the
         // new completer:
         //
         var cur = this.code_mirror.getCursor();
         var res = CodeMirror.contextHint(this.code_mirror);
         
         // append the introspection result, in order, at
         // at the beginning of the table and compute the replacement rance
         // from current cursor positon and matched_text length.
         for(var i= matches.length-1; i>=0 ;--i)
         {
             res.unshift(
                 {
                     str  : matches[i],
                     type : "introspection",
                     from : {line: cur.line, ch: cur.ch-matched_text.length},
                     to   : {line: cur.line, ch: cur.ch}
                 }
             )
         }
         this._compcallback(res);
     };
 
 
     CodeCell.prototype.select = function () {
         IPython.Cell.prototype.select.apply(this);
         this.code_mirror.refresh();
         this.code_mirror.focus();
         // We used to need an additional refresh() after the focus, but
         // it appears that this has been fixed in CM. This bug would show
         // up on FF when a newly loaded markdown cell was edited.
     };
 
 
     CodeCell.prototype.select_all = function () {
         var start = {line: 0, ch: 0};
         var nlines = this.code_mirror.lineCount();
         var last_line = this.code_mirror.getLine(nlines-1);
         var end = {line: nlines-1, ch: last_line.length};
         this.code_mirror.setSelection(start, end);
     };
 
 
     CodeCell.prototype.append_output = function (json, dynamic) {
         // If dynamic is true, javascript output will be eval'd.
         this.expand();
         this.flush_clear_timeout();
         if (json.output_type === 'pyout') {
             this.append_pyout(json, dynamic);
         } else if (json.output_type === 'pyerr') {
             this.append_pyerr(json);
         } else if (json.output_type === 'display_data') {
             this.append_display_data(json, dynamic);
         } else if (json.output_type === 'stream') {
             this.append_stream(json);
         };
         this.outputs.push(json);
     };
 
 
     CodeCell.prototype.create_output_area = function () {
         var oa = $("<div/>").addClass("hbox output_area");
         oa.append($('<div/>').addClass('prompt'));
         return oa;
     };
 
 
     CodeCell.prototype.append_pyout = function (json, dynamic) {
         var n = json.prompt_number || ' ';
         var toinsert = this.create_output_area();
         toinsert.find('div.prompt').addClass('output_prompt').html('Out[' + n + ']:');
         this.append_mime_type(json, toinsert, dynamic);
         this.element.find('div.output').append(toinsert);
         // If we just output latex, typeset it.
         if ((json.latex !== undefined) || (json.html !== undefined)) {
             this.typeset();
         };
     };
 
 
     CodeCell.prototype.append_pyerr = function (json) {
         var tb = json.traceback;
         if (tb !== undefined && tb.length > 0) {
             var s = '';
             var len = tb.length;
             for (var i=0; i<len; i++) {
                 s = s + tb[i] + '\n';
             }
             s = s + '\n';
             var toinsert = this.create_output_area();
             this.append_text(s, toinsert);
             this.element.find('div.output').append(toinsert);
         };
     };
 
 
     CodeCell.prototype.append_stream = function (json) {
         // temporary fix: if stream undefined (json file written prior to this patch),
         // default to most likely stdout:
         if (json.stream == undefined){
             json.stream = 'stdout';
         }
         if (!utils.fixConsole(json.text)){
             // fixConsole gives nothing (empty string, \r, etc.)
             // so don't append any elements, which might add undesirable space
             return;
         }
         var subclass = "output_"+json.stream;
         if (this.outputs.length > 0){
             // have at least one output to consider
             var last = this.outputs[this.outputs.length-1];
             if (last.output_type == 'stream' && json.stream == last.stream){
                 // latest output was in the same stream,
                 // so append directly into its pre tag
                 // escape ANSI & HTML specials:
                 var text = utils.fixConsole(json.text);
                 this.element.find('div.'+subclass).last().find('pre').append(text);
                 return;
             }
         }
         
         // If we got here, attach a new div
         var toinsert = this.create_output_area();
         this.append_text(json.text, toinsert, "output_stream "+subclass);
         this.element.find('div.output').append(toinsert);
     };
 
 
     CodeCell.prototype.append_display_data = function (json, dynamic) {
         var toinsert = this.create_output_area();
         this.append_mime_type(json, toinsert, dynamic);
         this.element.find('div.output').append(toinsert);
         // If we just output latex, typeset it.
         if ( (json.latex !== undefined) || (json.html !== undefined) ) {
             this.typeset();
         };
     };
 
 
     CodeCell.prototype.append_mime_type = function (json, element, dynamic) {
         if (json.javascript !== undefined && dynamic) {
             this.append_javascript(json.javascript, element, dynamic);
         } else if (json.html !== undefined) {
             this.append_html(json.html, element);
         } else if (json.latex !== undefined) {
             this.append_latex(json.latex, element);
         } else if (json.svg !== undefined) {
             this.append_svg(json.svg, element);
         } else if (json.png !== undefined) {
             this.append_png(json.png, element);
         } else if (json.jpeg !== undefined) {
             this.append_jpeg(json.jpeg, element);
         } else if (json.text !== undefined) {
             this.append_text(json.text, element);
         };
     };
 
 
     CodeCell.prototype.append_html = function (html, element) {
         var toinsert = $("<div/>").addClass("box_flex1 output_subarea output_html rendered_html");
         toinsert.append(html);
         element.append(toinsert);
     };
 
 
     CodeCell.prototype.append_javascript = function (js, container) {
         // We just eval the JS code, element appears in the local scope.
         var element = $("<div/>").addClass("box_flex1 output_subarea");
         container.append(element);
         // Div for js shouldn't be drawn, as it will add empty height to the area.
         container.hide();
         // If the Javascript appends content to `element` that should be drawn, then
         // it must also call `container.show()`.
         eval(js);
     }
 
 
     CodeCell.prototype.append_text = function (data, element, extra_class) {
         var toinsert = $("<div/>").addClass("box_flex1 output_subarea output_text");
         // escape ANSI & HTML specials in plaintext:
         data = utils.fixConsole(data);
         if (extra_class){
             toinsert.addClass(extra_class);
         }
         toinsert.append($("<pre/>").html(data));
         element.append(toinsert);
     };
 
 
     CodeCell.prototype.append_svg = function (svg, element) {
         var toinsert = $("<div/>").addClass("box_flex1 output_subarea output_svg");
         toinsert.append(svg);
         element.append(toinsert);
     };
 
 
     CodeCell.prototype.append_png = function (png, element) {
         var toinsert = $("<div/>").addClass("box_flex1 output_subarea output_png");
         toinsert.append($("<img/>").attr('src','data:image/png;base64,'+png));
         element.append(toinsert);
     };
 
 
     CodeCell.prototype.append_jpeg = function (jpeg, element) {
         var toinsert = $("<div/>").addClass("box_flex1 output_subarea output_jpeg");
         toinsert.append($("<img/>").attr('src','data:image/jpeg;base64,'+jpeg));
         element.append(toinsert);
     };
 
 
     CodeCell.prototype.append_latex = function (latex, element) {
         // This method cannot do the typesetting because the latex first has to
         // be on the page.
         var toinsert = $("<div/>").addClass("box_flex1 output_subarea output_latex");
         toinsert.append(latex);
         element.append(toinsert);
     };
 
 
     CodeCell.prototype.clear_output = function (stdout, stderr, other) {
         var that = this;
         if (this.clear_out_timeout != null){
             // fire previous pending clear *immediately*
             clearTimeout(this.clear_out_timeout);
             this.clear_out_timeout = null;
             this.clear_output_callback(this._clear_stdout, this._clear_stderr, this._clear_other);
         }
         // store flags for flushing the timeout
         this._clear_stdout = stdout;
         this._clear_stderr = stderr;
         this._clear_other = other;
         this.clear_out_timeout = setTimeout(function(){
             // really clear timeout only after a short delay
             // this reduces flicker in 'clear_output; print' cases
             that.clear_out_timeout = null;
             that._clear_stdout = that._clear_stderr = that._clear_other = null;
             that.clear_output_callback(stdout, stderr, other);
         }, 500
         );
     };
     
     CodeCell.prototype.clear_output_callback = function (stdout, stderr, other) {
         var output_div = this.element.find("div.output");
         
         if (stdout && stderr && other){
             // clear all, no need for logic
             output_div.html("");
             this.outputs = [];
             return;
         }
         // remove html output
         // each output_subarea that has an identifying class is in an output_area
         // which is the element to be removed.
         if (stdout){
             output_div.find("div.output_stdout").parent().remove();
         }
         if (stderr){
             output_div.find("div.output_stderr").parent().remove();
         }
         if (other){
             output_div.find("div.output_subarea").not("div.output_stderr").not("div.output_stdout").parent().remove();
         }
         
         // remove cleared outputs from JSON list:
         for (var i = this.outputs.length - 1; i >= 0; i--){
             var out = this.outputs[i];
             var output_type = out.output_type;
             if (output_type == "display_data" && other){
                 this.outputs.splice(i,1);
             }else if (output_type == "stream"){
                 if (stdout && out.stream == "stdout"){
                     this.outputs.splice(i,1);
                 }else if (stderr && out.stream == "stderr"){
                     this.outputs.splice(i,1);
                 }
             }
         }
     };
 
 
     CodeCell.prototype.clear_input = function () {
         this.code_mirror.setValue('');
     };
     
     CodeCell.prototype.flush_clear_timeout = function() {
         var output_div = this.element.find('div.output');
         if (this.clear_out_timeout){
             clearTimeout(this.clear_out_timeout);
             this.clear_out_timeout = null;
             this.clear_output_callback(this._clear_stdout, this._clear_stderr, this._clear_other);
         };
     }
 
 
     CodeCell.prototype.collapse = function () {
         if (!this.collapsed) {
             this.element.find('div.output').hide();
             this.collapsed = true;
         };
     };
 
 
     CodeCell.prototype.expand = function () {
         if (this.collapsed) {
             this.element.find('div.output').show();
             this.collapsed = false;
         };
     };
 
 
     CodeCell.prototype.toggle_output = function () {
         if (this.collapsed) {
             this.expand();
         } else {
             this.collapse();
         };
     };
 
     CodeCell.prototype.set_input_prompt = function (number) {
         this.input_prompt_number = number;
         var ns = number || "&nbsp;";
         this.element.find('div.input_prompt').html('In&nbsp;[' + ns + ']:');
     };
 
 
     CodeCell.prototype.get_text = function () {
         return this.code_mirror.getValue();
     };
 
 
     CodeCell.prototype.set_text = function (code) {
         return this.code_mirror.setValue(code);
     };
 
 
     CodeCell.prototype.at_top = function () {
         var cursor = this.code_mirror.getCursor();
         if (cursor.line === 0) {
             return true;
         } else {
             return false;
         }
     };
 
 
     CodeCell.prototype.at_bottom = function () {
         var cursor = this.code_mirror.getCursor();
         if (cursor.line === (this.code_mirror.lineCount()-1)) {
             return true;
         } else {
             return false;
         }
     };
 
 
     CodeCell.prototype.fromJSON = function (data) {
         if (data.cell_type === 'code') {
             if (data.input !== undefined) {
                 this.set_text(data.input);
             }
             if (data.prompt_number !== undefined) {
                 this.set_input_prompt(data.prompt_number);
             } else {
                 this.set_input_prompt();
             };
             var len = data.outputs.length;
             for (var i=0; i<len; i++) {
                 // append with dynamic=false.
                 this.append_output(data.outputs[i], false);
             };
             if (data.collapsed !== undefined) {
                 if (data.collapsed) {
                     this.collapse();
                 } else {
                     this.expand();
                 };
             };
         };
     };
 
 
     CodeCell.prototype.toJSON = function () {
         var data = {};
         data.input = this.get_text();
         data.cell_type = 'code';
         if (this.input_prompt_number) {
             data.prompt_number = this.input_prompt_number;
         };
         var outputs = [];
         var len = this.outputs.length;
         for (var i=0; i<len; i++) {
             outputs[i] = this.outputs[i];
         };
         data.outputs = outputs;
         data.language = 'python';
         data.collapsed = this.collapsed;
         return data;
     };
 
 
     IPython.CodeCell = CodeCell;
 
     return IPython;
 }(IPython));

IPython/frontend/html/notebook/static/js/utils.js

@@ -1,102 +1,120
 //----------------------------------------------------------------------------
 //  Copyright (C) 2008-2011  The IPython Development Team
 //
 //  Distributed under the terms of the BSD License.  The full license is in
 //  the file COPYING, distributed as part of this software.
 //----------------------------------------------------------------------------
 
 //============================================================================
 // Utilities
 //============================================================================
 
 IPython.namespace('IPython.utils');
 
 IPython.utils = (function (IPython) {
 
     var uuid = function () {
         // http://www.ietf.org/rfc/rfc4122.txt
         var s = [];
         var hexDigits = "0123456789ABCDEF";
         for (var i = 0; i < 32; i++) {
             s[i] = hexDigits.substr(Math.floor(Math.random() * 0x10), 1);
         }
         s[12] = "4";  // bits 12-15 of the time_hi_and_version field to 0010
         s[16] = hexDigits.substr((s[16] & 0x3) | 0x8, 1);  // bits 6-7 of the clock_seq_hi_and_reserved to 01
 
         var uuid = s.join("");
         return uuid;
     };
 
 
     //Fix raw text to parse correctly in crazy XML
     function xmlencode(string) {
         return string.replace(/\&/g,'&'+'amp;')
             .replace(/</g,'&'+'lt;')
             .replace(/>/g,'&'+'gt;')
             .replace(/\'/g,'&'+'apos;')
             .replace(/\"/g,'&'+'quot;')
             .replace(/`/g,'&'+'#96;');
     }
 
 
     //Map from terminal commands to CSS classes
     ansi_colormap = {
         "30":"ansiblack", "31":"ansired",
         "32":"ansigreen", "33":"ansiyellow",
         "34":"ansiblue", "35":"ansipurple","36":"ansicyan", 
         "37":"ansigrey", "01":"ansibold"
     };
 
     // Transform ANI color escape codes into HTML <span> tags with css
     // classes listed in the above ansi_colormap object. The actual color used
     // are set in the css file.
     function fixConsole(txt) {
         txt = xmlencode(txt);
         var re = /\033\[([\dA-Fa-f;]*?)m/;
         var opened = false;
         var cmds = [];
         var opener = "";
         var closer = "";
         // \r does nothing, so shouldn't be included
         txt = txt.replace('\r', '');
         while (re.test(txt)) {
             var cmds = txt.match(re)[1].split(";");
             closer = opened?"</span>":"";
             opened = cmds.length > 1 || cmds[0] != 0;
             var rep = [];
             for (var i in cmds)
                 if (typeof(ansi_colormap[cmds[i]]) != "undefined")
                     rep.push(ansi_colormap[cmds[i]]);
             opener = rep.length > 0?"<span class=\""+rep.join(" ")+"\">":"";
             txt = txt.replace(re, closer + opener);
         }
         if (opened) txt += "</span>";
         return txt;
     }
 
 
     grow = function(element) {
         // Grow the cell by hand. This is used upon reloading from JSON, when the
         // autogrow handler is not called.
         var dom = element.get(0);
         var lines_count = 0;
         // modified split rule from
         // http://stackoverflow.com/questions/2035910/how-to-get-the-number-of-lines-in-a-textarea/2036424#2036424
         var lines = dom.value.split(/\r|\r\n|\n/);
         lines_count = lines.length;
         if (lines_count >= 1) {
             dom.rows = lines_count;
         } else {
             dom.rows = 1;
         }
     };
 
+    // some keycodes that seem to be platform/browser independant
+    var keycodes ={
+                backspace:  8,
+                tab      :  9,
+                enter    : 13,
+                shift    : 16,
+                esc      : 27,
+                space    : 32,
+                pgUp     : 33,
+                pgDown   : 34,
+                leftArrow: 37,
+                left     : 37,
+                upArrow  : 38,
+                rightArrow:39,
+                right    : 39,
+                downArrow: 40,
+    };
 
     return {
         uuid : uuid,
         fixConsole : fixConsole,
-        grow : grow
+        keycodes : keycodes,
+        grow : grow,
     };
 
 }(IPython));