1
/* IVLE - Informatics Virtual Learning Environment
2
* Copyright (C) 2007-2008 The University of Melbourne
4
* This program is free software; you can redistribute it and/or modify
5
* it under the terms of the GNU General Public License as published by
6
* the Free Software Foundation; either version 2 of the License, or
7
* (at your option) any later version.
9
* This program is distributed in the hope that it will be useful,
10
* but WITHOUT ANY WARRANTY; without even the implied warranty of
11
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12
* GNU General Public License for more details.
14
* You should have received a copy of the GNU General Public License
15
* along with this program; if not, write to the Free Software
16
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
18
* Module: Console (Client-side JavaScript)
19
* Author: Tom Conway, Matt Giuca
25
/* Begin religious debate (tabs vs spaces) here: */
26
/* (This string will be inserted in the console when the user presses the Tab
30
/* Console DOM objects */
32
console_filler = null;
34
windowpane_mode = false;
35
server_started = false;
40
function get_console_start_directory()
42
if((typeof(current_path) != 'undefined') && current_file)
44
// We have a current_path - give a suggestion to the server
46
if (current_file.isdir)
49
return path_join("/home", current_path);
53
// Editor - need to chop off filename
54
var tmp_path = current_path.split('/');
56
return path_join("/home", tmp_path.join('/'));
61
// No current_path - let the server decide
66
/* Starts the console server, if it isn't already.
67
* This can be called any number of times - it only starts the one server.
68
* Note that this is asynchronous. It will return after signalling to start
69
* the server, but there is no guarantee that it has been started yet.
70
* This is a separate step from console_init, as the server is only to be
71
* started once the first command is entered.
72
* Does not return a value. Writes to global variables
73
* server_host, and server_port.
75
* \param callback Function which will be called after the server has been
76
* started. No parameters are passed. May be null.
78
function start_server(callback)
85
var callback1 = function(xhr)
87
var json_text = xhr.responseText;
88
server_key = JSON.parse(json_text).key;
89
server_started = true;
95
callback1, "console", "service",
96
{"ivle.op": "start", "cwd": get_console_start_directory()},
100
/** Initialises the console. All apps which import console are required to
101
* call this function.
102
* Optional "windowpane" (bool), if true, will cause the console to go into
103
* "window pane" mode which will allow it to be opened and closed, and float
105
* (Defaults to closed).
107
function console_init(windowpane)
109
/* Set up the console as a floating pane */
110
console_body = document.getElementById("console_body");
111
/* If there is no console body, don't worry.
112
* (This lets us import console.js even on pages without a console box */
113
if (console_body == null) return;
114
console_filler = document.getElementById("console_filler");
117
windowpane_mode = true;
122
/** Hide the main console panel, so the console minimizes to just an input box
123
* at the page bottom. */
124
function console_minimize()
126
if (!windowpane_mode) return;
127
console_body.setAttribute("class", "windowpane minimal");
128
console_filler.setAttribute("class", "windowpane minimal");
131
/** Show the main console panel, so it enlarges out to its full size.
133
function console_maximize()
135
if (!windowpane_mode) return;
136
console_body.setAttribute("class", "windowpane maximal");
137
console_filler.setAttribute("class", "windowpane maximal");
140
/* current_text is the string currently on the command line.
141
* If non-empty, it will be stored at the bottom of the history.
143
function historyUp(current_text)
145
/* Remember the changes made to this item */
146
this.edited[this.cursor] = current_text;
151
this.earliestCursor = this.cursor;
154
function historyDown(current_text)
156
/* Remember the changes made to this item */
157
this.edited[this.cursor] = current_text;
158
if (this.cursor < this.items.length - 1)
164
function historyCurr()
166
return this.edited[this.cursor];
169
function historySubmit(text)
171
/* Copy the selected item's "edited" version over the permanent version of
173
this.items[this.items.length-1] = text;
174
/* Add a new blank item */
175
this.items[this.items.length] = "";
176
this.cursor = this.items.length-1;
177
/* Blow away all the edited versions, replacing them with the existing
179
* Not the whole history - just start from the earliest edited one.
180
* (This avoids slowdown over extended usage time).
182
for (var i=this.earliestCursor; i<=this.cursor; i++)
183
this.edited[i] = this.items[i];
184
this.earliestCursor = this.cursor;
187
function historyShow()
190
for (var i = 0; i < this.items.length; i++)
192
if (i == this.cursor)
196
res += this.items[i].toString();
197
if (i == this.cursor)
203
if (this.cursor == this.items.length)
211
* This is a fairly complex mechanism due to complications when editing
212
* history items. We store two arrays. "items" is the permanent history of
213
* each item. "edited" is a "volatile" version of items - the edits made to
214
* the history between now and last time you hit "enter".
215
* This is because the user can go back and edit any of the previous items,
216
* and the edits are remembered until they hit enter.
218
* When hitting enter, the "edited" version of the currently selected item
219
* replaces the "item" version of the last item in the list.
220
* Then a new blank item is created, for the new line of input.
221
* Lastly, all the "edited" versions are replaced with their stable versions.
223
* Cursor never points to an invalid location.
227
this.items = new Array("");
228
this.edited = new Array("");
230
this.earliestCursor = 0;
232
this.down = historyDown;
233
this.curr = historyCurr;
234
this.submit = historySubmit;
235
this.show = historyShow;
238
var hist = new History();
240
function set_interrupt()
245
function clear_output()
247
var output = document.getElementById("console_output");
248
while (output.firstChild)
250
output.removeChild(output.firstChild);
254
/** Send a line of text to the Python server, wait for its return, and react
255
* to its response by writing to the output box.
256
* Also maximize the console window if not already.
258
function console_enter_line(inputbox, which)
262
if (typeof(inputbox) == "string")
264
var inputline = inputbox + "\n";
269
/* Disable the text box */
270
inputbox.setAttribute("disabled", "disabled");
272
var inputline = inputbox.value + "\n";
274
var output = document.getElementById("console_output");
277
var span = document.createElement("span");
278
span.setAttribute("class", "inputPrompt");
279
span.appendChild(document.createTextNode(
280
document.getElementById("console_prompt").firstChild.nodeValue)
282
output.appendChild(span);
283
// Print input line itself in a span
284
var span = document.createElement("span");
285
span.setAttribute("class", "inputMsg");
286
span.appendChild(document.createTextNode(inputline));
287
output.appendChild(span);
290
"ivle.op": "chat", "kind": which, "key": server_key,
291
"text": inputline, "cwd": get_console_start_directory()
293
var callback = function(xhr)
295
console_response(inputbox, inputline, xhr.responseText);
297
ajax_call(callback, "console", "service", args, "POST");
300
function console_response(inputbox, inputline, responseText)
304
var res = JSON.parse(responseText);
308
alert("An internal error occurred in the python console.");
311
var output = document.getElementById("console_output");
312
if (res.hasOwnProperty('okay'))
317
output.appendChild(document.createTextNode(res.okay + "\n"));
318
output.appendChild(span);
320
// set the prompt to >>>
323
else if (res.hasOwnProperty('exc'))
326
// print out the error message (res.exc)
327
print_error(res.exc);
329
// set the prompt to >>>
332
else if (res.hasOwnProperty('restart') && res.hasOwnProperty('key'))
334
// Server has indicated that the console should be restarted
336
// Get the new key (host, port, magic)
337
server_key = res.key;
339
// Print a reason to explain why we'd do such a horrible thing
340
// (console timeout, server error etc.)
341
print_error("Console Restart: " + res.restart);
343
// set the prompt to >>>
346
else if (res.hasOwnProperty('more'))
348
// Need more input, so set the prompt to ...
351
else if (res.hasOwnProperty('output'))
353
if (res.output.length > 0)
355
output.appendChild(document.createTextNode(res.output));
357
var callback = function(xhr)
359
console_response(inputbox, null, xhr.responseText);
363
var kind = "interrupt";
370
"ivle.op": "chat", "kind": kind, "key": server_key,
371
"text": '', "cwd": get_console_start_directory()
373
ajax_call(callback, "console", "service", args, "POST");
375
// Open up the console so we can see the output
376
// FIXME: do we need to maximize here?
380
divScroll.activeScroll();
382
// Return early, so we don't re-enable the input box.
387
// assert res.hasOwnProperty('input')
391
if (inputbox != null)
393
/* Re-enable the text box */
394
inputbox.removeAttribute("disabled");
398
/* Open up the console so we can see the output */
401
divScroll.activeScroll();
403
// Focus the input box by default
404
document.getElementById("console_output").focus();
405
document.getElementById("console_inputText").focus();
408
function catch_input(key)
410
var inp = document.getElementById('console_inputText');
413
case 9: /* Tab key */
414
var selstart = inp.selectionStart;
415
var selend = inp.selectionEnd;
416
if (selstart == selend)
418
/* No selection, just a carat. Insert a tab here. */
419
inp.value = inp.value.substr(0, selstart)
420
+ TAB_STRING + inp.value.substr(selstart);
424
/* Text is selected. Just indent the whole line
425
* by inserting a tab at the start */
426
inp.value = TAB_STRING + inp.value;
428
/* Update the selection so the same characters as before are selected
430
inp.selectionStart = selstart + TAB_STRING.length;
431
inp.selectionEnd = inp.selectionStart + (selend - selstart);
432
/* Cancel the event, so the TAB key doesn't move focus away from this
435
/* Note: If it happens that some browsers don't support event
436
* cancelling properly, this hack might work instead:
438
"document.getElementById('console_inputText').focus()",
442
case 13: /* Enter key */
443
var callback = function()
445
/* Send the line of text to the server */
446
console_enter_line(inp, "chat");
447
hist.submit(inp.value);
448
inp.value = hist.curr();
451
/* Disable the text box. This will be redone by
452
* console_enter_line, but we do it here too in case start_server
455
inp.setAttribute("disabled", "disabled");
456
/* Start the server if it hasn't already been started */
457
start_server(callback);
459
case 38: /* Up arrow */
461
inp.value = hist.curr();
462
/* Inhibit further responses to this event, or WebKit moves the
463
* cursor to the start. */
466
case 40: /* Down arrow */
467
hist.down(inp.value);
468
inp.value = hist.curr();
474
/** Resets the console by signalling the old console to expire and starting a
477
function console_reset()
479
// FIXME: We show some feedback here - either disable input or at very
480
// least the reset button.
482
// Restart the console
489
xhr = ajax_call(null, "console", "service", {"ivle.op": "chat", "kind": "terminate", "key": server_key, "cwd": get_console_start_directory()}, "POST");
490
console_response(null, null, xhr.responseText);
494
/** Prints an error line in the console **/
495
function print_error(error)
497
var output = document.getElementById("console_output");
500
var span = document.createElement("span");
501
span.setAttribute("class", "errorMsg");
502
span.appendChild(document.createTextNode(error + "\n"));
503
output.appendChild(span);
506
divScroll.activeScroll();
509
/** Sets the prompt text **/
510
function set_prompt(prompt_text)
512
var prompt = document.getElementById("console_prompt");
513
prompt.replaceChild(document.createTextNode(prompt_text + " "), prompt.firstChild);
516
/**** Following Code modified from ******************************************/
517
/**** http://radio.javaranch.com/pascarello/2006/08/17/1155837038219.html ***/
518
/****************************************************************************/
519
var chatscroll = new Object();
521
chatscroll.Pane = function(scrollContainerId)
523
this.scrollContainerId = scrollContainerId;
526
chatscroll.Pane.prototype.activeScroll = function()
528
var scrollDiv = document.getElementById(this.scrollContainerId);
529
var currentHeight = 0;
531
if (scrollDiv.scrollHeight > 0)
532
currentHeight = scrollDiv.scrollHeight;
533
else if (scrollDiv.offsetHeight > 0)
534
currentHeight = scrollDiv.offsetHeight;
536
scrollDiv.scrollTop = currentHeight;
541
var divScroll = new chatscroll.Pane('console_output');