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comparison rlgterm.js @ 0:bd412f63ce0d

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Put this project under version control, finally.
author John "Elwin" Edwards <elwin@sdf.org>
date Sun, 06 May 2012 08:45:40 -0700
parents
children ee22eb9ab009
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-1:000000000000 0:bd412f63ce0d
1 /* rlgterm.js: Roguelike Gallery's driver for termemu.js */
2
3 // A state machine that keeps track of polling the server.
4 var ajaxstate = {
5 state: 0,
6 timerID: null,
7 clear: function () {
8 if (this.timerID != null) {
9 window.clearTimeout(this.timerID);
10 this.timerID = null;
11 }
12 },
13 set: function (ms) {
14 this.clear();
15 this.timerID = window.setTimeout(getData, ms);
16 },
17 gotdata: function () {
18 this.set(100);
19 this.state = 0;
20 },
21 gotnothing: function () {
22 if (this.state == 0) {
23 this.set(100);
24 this.state = 1;
25 }
26 else if (this.state == 1) {
27 this.set(300);
28 this.state = 2;
29 }
30 else if (this.state == 2) {
31 this.set(1000);
32 this.state = 3;
33 }
34 else {
35 this.set(5000);
36 this.state = 3;
37 }
38 },
39 posted: function () {
40 this.set(100);
41 this.state = 0;
42 }
43 };
44
45 function writeData(hexstr) {
46 var codenum;
47 var codes = [];
48 var nc;
49 var u8wait = 0; /* Stores bits from previous bytes of multibyte sequences. */
50 var expect = 0; /* The number of 10------ bytes expected. */
51 /* UTF-8 translation. */
52 for (var i = 0; i < hexstr.length; i += 2) {
53 nc = Number("0x" + hexstr.substr(i, 2));
54 if (nc < 0x7F) {
55 /* 0------- */
56 codes.push(nc);
57 /* Any incomplete sequence will be discarded. */
58 u8wait = 0;
59 expect = 0;
60 }
61 else if (nc < 0xC0) {
62 /* 10------ : part of a multibyte sequence */
63 if (expect > 0) {
64 u8wait <<= 6;
65 u8wait += (nc & 0x3F);
66 expect--;
67 if (expect == 0) {
68 codes.push(u8wait);
69 u8wait = 0;
70 }
71 }
72 else {
73 /* Assume an initial byte was missed. */
74 u8wait = 0;
75 }
76 }
77 /* These will all discard any incomplete sequence. */
78 else if (nc < 0xE0) {
79 /* 110----- : introduces 2-byte sequence */
80 u8wait = (nc & 0x1F);
81 expect = 1;
82 }
83 else if (nc < 0xF0) {
84 /* 1110---- : introduces 3-byte sequence */
85 u8wait = (nc & 0x0F);
86 expect = 2;
87 }
88 else if (nc < 0xF8) {
89 /* 11110--- : introduces 4-byte sequence */
90 u8wait = (nc & 0x07);
91 expect = 3;
92 }
93 else if (nc < 0xFC) {
94 /* 111110-- : introduces 5-byte sequence */
95 u8wait = (nc & 0x03);
96 expect = 4;
97 }
98 else if (nc < 0xFE) {
99 /* 1111110- : introduces 6-byte sequence */
100 u8wait = (nc & 0x01);
101 expect = 5;
102 }
103 else {
104 /* 1111111- : should never appear */
105 u8wait = 0;
106 expect = 0;
107 }
108 /* Supporting all 31 bits is probably overkill... */
109 }
110 termemu.write(codes);
111 return;
112 }
113
114 /* Processes a message from the server, returning true or false if it was a
115 * data message with or without data, null if not data. */
116 function processMsg(msg) {
117 var msglines = msg.split("\n");
118 var havedata = null;
119 if (!msglines[0])
120 return null;
121 if (msglines[0].charAt(0) == 'd') {
122 if (msglines[1]){
123 writeData(msglines[1]);
124 havedata = true;
125 }
126 else {
127 havedata = false;
128 }
129 }
130 else if (msglines[0] == "E1") {
131 logout();
132 }
133 else if (msglines[0].charAt(0) == "T") {
134 setTitle(msglines[1]);
135 }
136 else if (msglines[0] == "q1") {
137 logout();
138 }
139 else {
140 debug(1, "Unrecognized server message " + msglines[0]);
141 }
142 return havedata;
143 }
144
145 function getData() {
146 if (termemu.sessid == null)
147 return;
148 var datareq = new XMLHttpRequest();
149 datareq.onreadystatechange = function () {
150 if (datareq.readyState == 4 && datareq.status == 200) {
151 var wasdata = processMsg(datareq.responseText);
152 if (wasdata != null) {
153 if (wasdata)
154 ajaxstate.gotdata();
155 else
156 ajaxstate.gotnothing();
157 }
158 return;
159 }
160 };
161 datareq.open('POST', '/feed', true);
162 datareq.send("id=" + termemu.sessid);
163 return;
164 }
165
166 function postResponseHandler() {
167 if (this.readyState == 4 && this.status == 200) {
168 // We might want to do something with wasdata someday.
169 var wasdata = processMsg(this.responseText);
170 ajaxstate.posted();
171 return;
172 }
173 }
174
175 function sendback(str) {
176 /* For responding to terminal queries. */
177 var datareq = new XMLHttpRequest();
178 datareq.onreadystatechange = postResponseHandler;
179 datareq.open('POST', '/feed', true);
180 datareq.send("id=" + termemu.sessid + "&keys=" + str);
181 return;
182 }
183
184 /* ASCII values of keys 0-9. */
185 var numShifts = [41, 33, 64, 35, 36, 37, 94, 38, 42, 40];
186
187 var keyHexCodes = {
188 init: function () {
189 this[KeyboardEvent.DOM_VK_RETURN] = ["0d", "0d"];
190 this[KeyboardEvent.DOM_VK_SPACE] = ["20", "20"];
191 this[KeyboardEvent.DOM_VK_TAB] = ["09", "09"];
192 this[KeyboardEvent.DOM_VK_BACK_QUOTE] = ["60", "7e"];
193 this[KeyboardEvent.DOM_VK_OPEN_BRACKET] = ["5b", "7b"];
194 this[KeyboardEvent.DOM_VK_CLOSE_BRACKET] = ["5d", "7d"];
195 this[KeyboardEvent.DOM_VK_BACK_SLASH] = ["5c", "7c"];
196 this[KeyboardEvent.DOM_VK_SEMICOLON] = ["3b", "3a"];
197 this[KeyboardEvent.DOM_VK_QUOTE] = ["27", "22"];
198 this[KeyboardEvent.DOM_VK_COMMA] = ["2c", "3c"];
199 this[KeyboardEvent.DOM_VK_PERIOD] = ["2e", "3e"];
200 this[KeyboardEvent.DOM_VK_SLASH] = ["2f", "3f"];
201 this[KeyboardEvent.DOM_VK_EQUALS] = ["3d", "2b"];
202 this[KeyboardEvent.DOM_VK_SUBTRACT] = ["2d", "5f"];
203 this[KeyboardEvent.DOM_VK_BACK_SPACE] = ["08", "08"];
204 this[KeyboardEvent.DOM_VK_ESCAPE] = ["1b", "1b"];
205 /* Multi-char control sequences! Neat! */
206 this[KeyboardEvent.DOM_VK_PAGE_UP] = ["1b5b357e", "1b5b357e"];
207 this[KeyboardEvent.DOM_VK_PAGE_DOWN] = ["1b5b367e", "1b5b367e"];
208 this.appCursor(false);
209 this.appKeypad(false);
210 },
211 appCursor: function (on) {
212 if (on) {
213 this[KeyboardEvent.DOM_VK_LEFT] = ["1b4f44", "1b4f44"];
214 this[KeyboardEvent.DOM_VK_RIGHT] = ["1b4f43", "1b4f43"];
215 this[KeyboardEvent.DOM_VK_UP] = ["1b4f41", "1b4f41"];
216 this[KeyboardEvent.DOM_VK_DOWN] = ["1b4f42", "1b4f42"];
217 this[KeyboardEvent.DOM_VK_END] = ["1b4f46", "1b4f46"];
218 this[KeyboardEvent.DOM_VK_HOME] = ["1b4f48", "1b4f48"];
219 }
220 else {
221 this[KeyboardEvent.DOM_VK_LEFT] = ["1b5b44", "1b5b44"];
222 this[KeyboardEvent.DOM_VK_RIGHT] = ["1b5b43", "1b5b43"];
223 this[KeyboardEvent.DOM_VK_UP] = ["1b5b41", "1b5b41"];
224 this[KeyboardEvent.DOM_VK_DOWN] = ["1b5b42", "1b5b42"];
225 this[KeyboardEvent.DOM_VK_END] = ["1b5b46", "1b5b46"];
226 this[KeyboardEvent.DOM_VK_HOME] = ["1b5b48", "1b5b48"];
227 }
228 },
229 appKeypad: function (on) {
230 /* In theory, these should produce either numerals or the k[a-c][1-3]
231 * sequences. Since we can't count on the terminfo description actually
232 * containing those sequences, pretend they're just arrow keys etc.
233 */
234 this[KeyboardEvent.DOM_VK_NUMPAD1] = ["1b4f46", "1b4f46"];
235 this[KeyboardEvent.DOM_VK_NUMPAD2] = ["1b4f42", "1b4f42"];
236 this[KeyboardEvent.DOM_VK_NUMPAD3] = ["1b5b367e", "1b5b367e"];
237 this[KeyboardEvent.DOM_VK_NUMPAD4] = ["1b4f44", "1b4f44"];
238 this[KeyboardEvent.DOM_VK_NUMPAD5] = ["1b5b45", "1b5b45"];
239 this[KeyboardEvent.DOM_VK_NUMPAD6] = ["1b4f43", "1b4f43"];
240 this[KeyboardEvent.DOM_VK_NUMPAD7] = ["1b4f48", "1b4f48"];
241 this[KeyboardEvent.DOM_VK_NUMPAD8] = ["1b4f41", "1b4f41"];
242 this[KeyboardEvent.DOM_VK_NUMPAD9] = ["1b5b357e", "1b5b357e"];
243 return;
244 }
245 };
246
247 function sendkey(ev) {
248 if (termemu.sessid == null)
249 return;
250 var keynum = ev.keyCode;
251 var code;
252 if (keynum >= ev.DOM_VK_A && keynum <= ev.DOM_VK_Z) {
253 /* Letters. This assumes the codes are 65-90. */
254 if (ev.ctrlKey)
255 keynum -= 64;
256 else if (!ev.shiftKey)
257 keynum += 32;
258 code = keynum.toString(16);
259 if (code.length < 2)
260 code = "0" + code;
261 }
262 else if (keynum >= ev.DOM_VK_0 && keynum <= ev.DOM_VK_9) {
263 /* The number row, NOT the numpad. */
264 if (ev.shiftKey) {
265 code = numShifts[keynum - 48].toString(16);
266 }
267 else {
268 code = keynum.toString(16);
269 }
270 }
271 else if (keynum in keyHexCodes) {
272 if (ev.shiftKey)
273 code = keyHexCodes[keynum][1];
274 else
275 code = keyHexCodes[keynum][0];
276 }
277 else if (keynum == ev.DOM_VK_SHIFT || keynum == ev.DOM_VK_CONTROL ||
278 keynum == ev.DOM_VK_ALT || keynum == ev.DOM_VK_CAPS_LOCK) {
279 return;
280 }
281 else {
282 debug(1, "Ignoring keycode " + keynum);
283 return;
284 }
285 if (termemu.sessid != null)
286 ev.preventDefault();
287 var datareq = new XMLHttpRequest();
288 datareq.onreadystatechange = postResponseHandler;
289 datareq.open('POST', '/feed', true);
290 datareq.send("id=" + termemu.sessid + "&keys=" + code);
291 return;
292 }
293
294 var charshifts = { '-': "5f", '=': "2b", '[': "7b", ']': "7d", '\\': "7c",
295 ';': "3a", '\'': "22", ',': "3c", '.': "3e", '/': "3f", '`': "7e"
296 }
297
298 function vkey(c) {
299 if (termemu.sessid == null)
300 return;
301 var keystr;
302 if (c.match(/^[a-z]$/)) {
303 if (termemu.ctrlp()) {
304 var n = c.charCodeAt(0) - 96;
305 keystr = n.toString(16);
306 if (keystr.length < 2)
307 keystr = "0" + keystr;
308 }
309 else if (termemu.shiftp())
310 keystr = c.toUpperCase().charCodeAt(0).toString(16);
311 else
312 keystr = c.charCodeAt(0).toString(16);
313 }
314 else if (c.match(/^[0-9]$/)) {
315 if (termemu.shiftp())
316 keystr = numShifts[c.charCodeAt(0) - 48].toString(16);
317 else
318 keystr = c.charCodeAt(0).toString(16);
319 }
320 else if (c == '\n')
321 keystr = "0a";
322 else if (c == '\t')
323 keystr = "09";
324 else if (c == '\b')
325 keystr = "08";
326 else if (c == ' ')
327 keystr = "20";
328 else if (c in charshifts) {
329 if (termemu.shiftp())
330 keystr = charshifts[c];
331 else
332 keystr = c.charCodeAt(0).toString(16);
333 }
334 else
335 return;
336 //writeData("Sending " + keystr);
337 var datareq = new XMLHttpRequest();
338 datareq.onreadystatechange = postResponseHandler;
339 datareq.open('POST', '/feed', true);
340 datareq.send("id=" + termemu.sessid + "&keys=" + keystr);
341 return;
342 }
343
344 function setup() {
345 keyHexCodes.init();
346 termemu.init("termwrap");
347 setTitle("Not connected.");
348 return;
349 }
350
351 function toggleshift() {
352 termemu.toggleshift();
353 keydiv = document.getElementById("shiftkey");
354 if (termemu.shiftp())
355 keydiv.className = "keysel";
356 else
357 keydiv.className = "key";
358 return;
359 }
360
361 function togglectrl() {
362 termemu.togglectrl();
363 keydiv = document.getElementById("ctrlkey");