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annotate shterm.js @ 60:31bb3cf4f25f

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Make sure watchers start with completely drawn screens. TermSessions now buffer all data since the last screen clear, so new Watchers can start with complete screens.
author John "Elwin" Edwards <elwin@sdf.org>
date Tue, 19 Jun 2012 19:11:59 -0700
parents 7a50b4412fea
children d7eb63cd7a16
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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
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5 var isalive = false; // Whether the session is currently active.
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6 var nsend = 0; // The number of the next packet to send.
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7 var nrecv = 0; // The next packet expected.
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8 var msgQ = []; // Queue for out-of-order messages.
13
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9
0
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10 // A state machine that keeps track of polling the server.
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11 var ajaxstate = {
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12 state: 0,
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13 timerID: null,
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14 clear: function () {
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15 if (this.timerID != null) {
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16 window.clearTimeout(this.timerID);
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17 this.timerID = null;
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18 }
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19 },
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20 set: function (ms) {
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21 this.clear();
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22 this.timerID = window.setTimeout(getData, ms);
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23 },
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24 gotdata: function () {
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25 this.set(100);
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26 this.state = 0;
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27 },
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28 gotnothing: function () {
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29 if (this.state == 0) {
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30 this.set(100);
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31 this.state = 1;
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32 }
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33 else if (this.state == 1) {
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34 this.set(300);
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35 this.state = 2;
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36 }
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37 else if (this.state == 2) {
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38 this.set(1000);
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39 this.state = 3;
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40 }
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41 else {
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42 this.set(5000);
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43 this.state = 3;
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44 }
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45 },
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46 posted: function () {
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47 this.set(100);
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48 this.state = 0;
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49 }
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50 };
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51
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52 function writeData(hexstr) {
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53 var codenum;
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54 var codes = [];
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55 var nc;
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56 var u8wait = 0; /* Stores bits from previous bytes of multibyte sequences. */
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57 var expect = 0; /* The number of 10------ bytes expected. */
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58 /* UTF-8 translation. */
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59 for (var i = 0; i < hexstr.length; i += 2) {
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60 nc = Number("0x" + hexstr.substr(i, 2));
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61 if (nc < 0x7F) {
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62 /* 0------- */
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63 codes.push(nc);
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64 /* Any incomplete sequence will be discarded. */
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65 u8wait = 0;
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66 expect = 0;
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67 }
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68 else if (nc < 0xC0) {
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69 /* 10------ : part of a multibyte sequence */
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70 if (expect > 0) {
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71 u8wait <<= 6;
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72 u8wait += (nc & 0x3F);
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73 expect--;
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74 if (expect == 0) {
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75 codes.push(u8wait);
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76 u8wait = 0;
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77 }
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78 }
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79 else {
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80 /* Assume an initial byte was missed. */
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81 u8wait = 0;
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82 }
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83 }
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84 /* These will all discard any incomplete sequence. */
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85 else if (nc < 0xE0) {
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86 /* 110----- : introduces 2-byte sequence */
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87 u8wait = (nc & 0x1F);
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