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annotate shterm.js @ 50:bef5629f50d8

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RLG-Web client: improve the forms. Put the forms into CSS tables so they look nicer. Also remove the <form> elements so they won't be submitted as forms.
author John "Elwin" Edwards <elwin@sdf.org>
date Mon, 11 Jun 2012 12:00:44 -0700
parents 155f3c104759
children 7a50b4412fea
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1
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1 /* shterm.js: browser-side JavaScript to handle I/O for termemu.js when it
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2 * is running a shell via the webtty.js server.
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3 */
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4
14
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5 var nsend = 0; // The number of the next packet to send.
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6 var nrecv = 0; // The next packet expected.
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7 var msgQ = []; // Queue for out-of-order messages.
13
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8
0
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9 // A state machine that keeps track of polling the server.
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10 var ajaxstate = {
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11 state: 0,
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12 timerID: null,
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13 clear: function () {
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14 if (this.timerID != null) {
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15 window.clearTimeout(this.timerID);
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16 this.timerID = null;
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17 }
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18 },
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19 set: function (ms) {
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20 this.clear();
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21 this.timerID = window.setTimeout(getData, ms);
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22 },
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23 gotdata: function () {
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24 this.set(100);
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25 this.state = 0;
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26 },
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27 gotnothing: function () {
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28 if (this.state == 0) {
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29 this.set(100);
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30 this.state = 1;
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31 }
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32 else if (this.state == 1) {
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33 this.set(300);
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34 this.state = 2;
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35 }
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36 else if (this.state == 2) {
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37 this.set(1000);
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38 this.state = 3;
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39 }
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40 else {
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41 this.set(5000);
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42 this.state = 3;
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43 }
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44 },
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45 posted: function () {
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46 this.set(100);
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47 this.state = 0;
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48 }
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49 };
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50
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51 function writeData(hexstr) {
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52 var codenum;
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53 var codes = [];
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54 var nc;
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55 var u8wait = 0; /* Stores bits from previous bytes of multibyte sequences. */
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56 var expect = 0; /* The number of 10------ bytes expected. */
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57 /* UTF-8 translation. */
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58 for (var i = 0; i < hexstr.length; i += 2) {
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59 nc = Number("0x" + hexstr.substr(i, 2));
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60 if (nc < 0x7F) {
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61 /* 0------- */
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62 codes.push(nc);
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63 /* Any incomplete sequence will be discarded. */
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64 u8wait = 0;
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65 expect = 0;
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66 }
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67 else if (nc < 0xC0) {
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68 /* 10------ : part of a multibyte sequence */
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69 if (expect > 0) {
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70 u8wait <<= 6;
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71 u8wait += (nc & 0x3F);
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72 expect--;
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73 if (expect == 0) {
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74 codes.push(u8wait);
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75 u8wait = 0;
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76 }
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77 }
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78 else {
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79 /* Assume an initial byte was missed. */
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80 u8wait = 0;
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81 }
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82 }
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83 /* These will all discard any incomplete sequence. */
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84 else if (nc < 0xE0) {
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85 /* 110----- : introduces 2-byte sequence */
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86 u8wait = (nc & 0x1F);
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87 expect = 1;
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