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annotate rlgterm.js @ 4:ee22eb9ab009

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Client: don't assume the terminal is 24x80.
author John "Elwin" Edwards <elwin@sdf.org>
date Mon, 07 May 2012 11:09:14 -0700
parents bd412f63ce0d
children 21738794755e
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1 /* rlgterm.js: Roguelike Gallery's driver for termemu.js */
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2
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3 // A state machine that keeps track of polling the server.
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4 var ajaxstate = {
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5 state: 0,
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6 timerID: null,
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7 clear: function () {
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8 if (this.timerID != null) {
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9 window.clearTimeout(this.timerID);
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10 this.timerID = null;
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11 }
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12 },
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13 set: function (ms) {
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14 this.clear();
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15 this.timerID = window.setTimeout(getData, ms);
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16 },
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17 gotdata: function () {
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18 this.set(100);
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19 this.state = 0;
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20 },
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21 gotnothing: function () {
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22 if (this.state == 0) {
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23 this.set(100);
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24 this.state = 1;
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25 }
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26 else if (this.state == 1) {
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27 this.set(300);
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28 this.state = 2;
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29 }
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30 else if (this.state == 2) {
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31 this.set(1000);
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32 this.state = 3;
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33 }
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34 else {
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35 this.set(5000);
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36 this.state = 3;
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37 }
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38 },
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39 posted: function () {
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40 this.set(100);
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41 this.state = 0;
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42 }
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43 };
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44
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45 function writeData(hexstr) {
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46 var codenum;
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47 var codes = [];
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48 var nc;
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49 var u8wait = 0; /* Stores bits from previous bytes of multibyte sequences. */
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50 var expect = 0; /* The number of 10------ bytes expected. */
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51 /* UTF-8 translation. */
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52 for (var i = 0; i < hexstr.length; i += 2) {
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53 nc = Number("0x" + hexstr.substr(i, 2));
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54 if (nc < 0x7F) {
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55 /* 0------- */
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56 codes.push(nc);
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57 /* Any incomplete sequence will be discarded. */
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58 u8wait = 0;
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59 expect = 0;
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60 }
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61 else if (nc < 0xC0) {
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62 /* 10------ : part of a multibyte sequence */
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63 if (expect > 0) {
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64 u8wait <<= 6;
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65 u8wait += (nc & 0x3F);
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66 expect--;
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67 if (expect == 0) {
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68 codes.push(u8wait);
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69 u8wait = 0;
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70 }
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71 }
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72 else {
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73 /* Assume an initial byte was missed. */
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74 u8wait = 0;
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75 }
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76 }
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77 /* These will all discard any incomplete sequence. */
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78 else if (nc < 0xE0) {
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79 /* 110----- : introduces 2-byte sequence */
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80 u8wait = (nc & 0x1F);
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81 expect = 1;
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82 }
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83 else if (nc < 0xF0) {
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84 /* 1110---- : introduces 3-byte sequence */
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85 u8wait = (nc & 0x0F);
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86 expect = 2;
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87 }
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88 else if (nc < 0xF8) {
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89 /* 11110--- : introduces 4-byte sequence */