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annotate rlgterm.js @ 35:f15efa4818b4

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rglterm.js: reduce the server polling. For roguelike games, most output will directly result from and follow immediately after input from the user. In other situations, data should not be expected.
author John "Elwin" Edwards <elwin@sdf.org>
date Tue, 05 Jun 2012 22:33:41 -0700
parents 83f9a799a374
children b06a14876645
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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(1000);
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19 this.state = 1;
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(1000);
0
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24 this.state = 1;
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25 }
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26 else {
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27 this.set(4000);
0
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28 this.state = 2;
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29 }
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30 },
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31 posted: function (wasdata) {
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32 if (wasdata) {
0
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33 this.set(1000);
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34 this.state = 1;
0
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35 }
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36 else {
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37 this.set(200);
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38 this.state = 0;
0
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39 }
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40 }
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41 };
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42
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43 function writeData(hexstr) {
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44 var codenum;
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45 var codes = [];
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46 var nc;
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47 var u8wait = 0; /* Stores bits from previous bytes of multibyte sequences. */
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48 var expect = 0; /* The number of 10------ bytes expected. */
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49 /* UTF-8 translation. */
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50 for (var i = 0; i < hexstr.length; i += 2) {
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51 nc = Number("0x" + hexstr.substr(i, 2));
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52 if (nc < 0x7F) {
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53 /* 0------- */
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54 codes.push(nc);
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55 /* Any incomplete sequence will be discarded. */
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56 u8wait = 0;
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57 expect = 0;
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58 }
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59 else if (nc < 0xC0) {
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60 /* 10------ : part of a multibyte sequence */
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61 if (expect > 0) {
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62 u8wait <<= 6;
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63 u8wait += (nc & 0x3F);
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64 expect--;
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65 if (expect == 0) {
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66 codes.push(u8wait);
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67 u8wait = 0;
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68 }
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69 }
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70 else {
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71 /* Assume an initial byte was missed. */
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72 u8wait = 0;
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73 }
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74 }
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75 /* These will all discard any incomplete sequence. */
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76 else if (nc < 0xE0) {
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77 /* 110----- : introduces 2-byte sequence */
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78 u8wait = (nc & 0x1F);
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79 expect = 1;
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80 }
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81 else if (nc < 0xF0) {
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82 /* 1110---- : introduces 3-byte sequence */
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83 u8wait = (nc & 0x0F);
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84 expect = 2;
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85 }
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86 else if (nc < 0xF8) {