Mercurial > hg > rlgwebd
annotate rlgterm.js @ 16:ef6127ed6da3
RLGWeb: switch to JSON protocol.
Port the JSON communication from WebTTY to RLGWeb. Fixing out-of-order
messages is still not implemented on the server side. Terminal size is
still hard-coded. Unused code is still lying around.
author | John "Elwin" Edwards <elwin@sdf.org> |
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date | Thu, 17 May 2012 09:32:19 -0700 |
parents | 826a7ced69f8 |
children | 188bbd857124 |
rev | line source |
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0
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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 */ |
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90 u8wait = (nc & 0x07); |
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91 expect = 3; |
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92 } |
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93 else if (nc < 0xFC) { |
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94 /* 111110-- : introduces 5-byte sequence */ |
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95 u8wait = (nc & 0x03); |
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96 expect = 4; |
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97 } |
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98 else if (nc < 0xFE) { |
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99 /* 1111110- : introduces 6-byte sequence */ |
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100 u8wait = (nc & 0x01); |
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101 expect = 5; |
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102 } |
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103 else { |
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104 /* 1111111- : should never appear */ |
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105 u8wait = 0; |
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106 expect = 0; |
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107 } |
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108 /* Supporting all 31 bits is probably overkill... */ |
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109 } |
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110 termemu.write(codes); |
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111 return; |
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112 } |
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113 |
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114 /* State for sending and receiving messages. */ |
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115 var nsend = 0; // The number of the next packet to send. |
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116 var nrecv = 0; // The next packet expected. |
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117 var msgQ = []; // Queue for out-of-order messages. |
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118 |
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119 /* Processes a message from the server, returning true or false if it was a |
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120 * data message with or without data, null if not data. |
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121 * All non-special responseTexts should be handed directly to this function. |
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122 */ |
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123 function processMsg(msg) { |
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124 var msgDict; |
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125 var havedata = null; // eventual return value |
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126 try { |
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127 msgDict = JSON.parse(msg); |
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128 } catch (e) { |
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129 if (e instanceof SyntaxError) |
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130 return null; |
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131 } |
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132 if (!msgDict.t) |
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133 return null; |
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134 else if (msgDict.t == "E") { |
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135 if (msgDict.c == 1) { |
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136 logout(); |
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137 } |
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138 debug(1, "Server error: " + msgDict.s); |
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139 } |
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140 else if (msgDict.t == "n") { |
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141 havedata = false; |
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142 } |
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143 // A data message |
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144 else if (msgDict.t == "d"){ |
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145 if (msgDict.n === nrecv) { |
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146 writeData(msgDict.d); |
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147 nrecv++; |
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148 /* Process anything in the queue that's now ready. */ |
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149 var next; |
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150 while ((next = msgQ.shift()) !== undefined) { |
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151 writeData(next.d); |
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152 nrecv++; |
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153 } |
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154 } |
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155 else if (response.n > nrecv) { |
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156 /* The current message comes after one still missing. Queue this one |
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157 * for later use. */ |
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158 debug(1, "Got packet " + msgDict.n + ", expected " + nrecv); |
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159 msgQ[msgDict.n - nrecv - 1] = msgDict; |
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160 } |
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161 else { |
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162 /* This message's number was encountered previously. */ |
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163 debug(1, "Discarding packet " + msgDict.n + ", expected " + nrecv); |
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164 } |
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165 havedata = true; |
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166 } |
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167 else if (msgDict.t == "T") { |
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168 setTitle(msgDict.d); |
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169 } |
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170 else if (msgDict.t == "q") { |
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171 logout(); |
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172 } |
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173 else { |
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174 debug(1, "Unrecognized server message " + msg); |
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175 } |
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176 return havedata; |
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177 } |
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178 |
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179 function getData() { |
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180 if (termemu.sessid == null) |
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181 return; |
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182 var datareq = new XMLHttpRequest(); |
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183 var msg = JSON.stringify({"id": termemu.sessid, "t": "n"}); |
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184 datareq.onreadystatechange = function () { |
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185 if (datareq.readyState == 4 && datareq.status == 200) { |
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186 var wasdata = processMsg(datareq.responseText); |
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187 if (wasdata != null) { |
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188 if (wasdata) |
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189 ajaxstate.gotdata(); |
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190 else |
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191 ajaxstate.gotnothing(); |
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192 } |
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193 return; |
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194 } |
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195 }; |
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196 datareq.open('POST', '/feed', true); |
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197 datareq.send(msg); |
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198 return; |
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199 } |
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200 |
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201 function postResponseHandler() { |
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202 if (this.readyState == 4 && this.status == 200) { |
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203 // We might want to do something with wasdata someday. |
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204 var wasdata = processMsg(this.responseText); |
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205 ajaxstate.posted(); |
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206 return; |
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207 } |
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208 } |
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209 |
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210 function sendback(str) { |
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211 /* For responding to terminal queries. */ |
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212 var msgDict = {"id": termemu.sessid, "t": "d", "n": nsend++, "d": str}; |
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213 var datareq = new XMLHttpRequest(); |
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214 datareq.onreadystatechange = postResponseHandler; |
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215 datareq.open('POST', '/feed', true); |
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216 datareq.send(JSON.stringify(msgDict)); |
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217 return; |
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218 } |
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219 |
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220 function sendkey(ev) { |
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221 if (termemu.sessid == null) |
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222 return; |
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223 var keynum = ev.keyCode; |
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224 var code; |
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225 if (keynum >= ev.DOM_VK_A && keynum <= ev.DOM_VK_Z) { |
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226 /* Letters. This assumes the codes are 65-90. */ |
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227 if (ev.ctrlKey) |
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228 keynum -= 64; |
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229 else if (!ev.shiftKey) |
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230 keynum += 32; |
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231 code = keynum.toString(16); |
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232 if (code.length < 2) |
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233 code = "0" + code; |
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234 } |
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235 else if (keynum >= ev.DOM_VK_0 && keynum <= ev.DOM_VK_9) { |
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236 /* The number row, NOT the numpad. */ |
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237 if (ev.shiftKey) { |
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238 code = numShifts[keynum - 48].toString(16); |
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239 } |
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240 else { |
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241 code = keynum.toString(16); |
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242 } |
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243 } |
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244 else if (keynum in keyHexCodes) { |
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245 if (ev.shiftKey) |
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246 code = keyHexCodes[keynum][1]; |
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247 else |
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248 code = keyHexCodes[keynum][0]; |
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249 } |
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250 else if (keynum == ev.DOM_VK_SHIFT || keynum == ev.DOM_VK_CONTROL || |
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251 keynum == ev.DOM_VK_ALT || keynum == ev.DOM_VK_CAPS_LOCK) { |
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252 return; |
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253 } |
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254 else { |
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255 debug(1, "Ignoring keycode " + keynum); |
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256 return; |
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257 } |
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258 // Isn't this check redundant? |
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259 if (termemu.sessid != null) |
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260 ev.preventDefault(); |
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261 var datareq = new XMLHttpRequest(); |
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262 var msgDict = {"id": termemu.sessid, "t": "d", "n": nsend++, "d": code}; |
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263 datareq.onreadystatechange = postResponseHandler; |
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264 datareq.open('POST', '/feed', true); |
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265 datareq.send(JSON.stringify(msgDict)); |
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266 return; |
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267 } |
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268 |
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269 var charshifts = { '-': "5f", '=': "2b", '[': "7b", ']': "7d", '\\': "7c", |
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270 ';': "3a", '\'': "22", ',': "3c", '.': "3e", '/': "3f", '`': "7e" |
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271 } |
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272 |
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273 function vkey(c) { |
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274 if (termemu.sessid == null) |
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275 return; |
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276 var keystr; |
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277 if (c.match(/^[a-z]$/)) { |
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278 if (termemu.ctrlp()) { |
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279 var n = c.charCodeAt(0) - 96; |
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280 keystr = n.toString(16); |
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281 if (keystr.length < 2) |
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282 keystr = "0" + keystr; |
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283 } |
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284 else if (termemu.shiftp()) |
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285 keystr = c.toUpperCase().charCodeAt(0).toString(16); |
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286 else |
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287 keystr = c.charCodeAt(0).toString(16); |
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288 } |
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289 else if (c.match(/^[0-9]$/)) { |
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290 if (termemu.shiftp()) |
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291 keystr = numShifts[c.charCodeAt(0) - 48].toString(16); |
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292 else |
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293 keystr = c.charCodeAt(0).toString(16); |
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294 } |
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295 else if (c == '\n') |
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296 keystr = "0a"; |
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297 else if (c == '\t') |
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298 keystr = "09"; |
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299 else if (c == '\b') |
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300 keystr = "08"; |
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301 else if (c == ' ') |
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302 keystr = "20"; |
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303 else if (c in charshifts) { |
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304 if (termemu.shiftp()) |
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305 keystr = charshifts[c]; |
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306 else |
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307 keystr = c.charCodeAt(0).toString(16); |
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308 } |
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309 else |
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310 return; |
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311 var datareq = new XMLHttpRequest(); |
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312 var msgDict = {"id": termemu.sessid, "t": "d", "n": nsend++, "d": keystr}; |
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313 datareq.onreadystatechange = postResponseHandler; |
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314 datareq.open('POST', '/feed', true); |
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315 datareq.send(JSON.stringify(msgDict)); |
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316 return; |
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317 } |
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318 |
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319 function setup() { |
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320 keyHexCodes.init(); |
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321 termemu.init("termwrap", 24, 80); |
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322 setTitle("Not connected."); |
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323 return; |
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324 } |
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325 |
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326 function toggleshift() { |
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327 termemu.toggleshift(); |
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328 keydiv = document.getElementById("shiftkey"); |
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329 if (termemu.shiftp()) |
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330 keydiv.className = "keysel"; |
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331 else |
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332 keydiv.className = "key"; |
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333 return; |
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334 } |
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335 |
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336 function togglectrl() { |
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337 termemu.togglectrl(); |
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338 keydiv = document.getElementById("ctrlkey"); |
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339 if (termemu.ctrlp()) |
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340 keydiv.className = "keysel"; |
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341 else |
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342 keydiv.className = "key"; |
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343 return; |
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344 } |
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345 |
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346 function formlogin(ev) { |
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347 ev.preventDefault(); |
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348 if (termemu.sessid != null) |
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349 return; |
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350 var loginmsg = {}; |
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351 loginmsg["name"] = document.getElementById("input_name").value; |
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352 loginmsg["pw"] = document.getElementById("input_pw").value; |
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353 loginmsg["game"] = document.getElementById("input_game").value; |
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354 loginmsg["h"] = 24; |
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355 loginmsg["w"] = 80; |
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356 var req = new XMLHttpRequest(); |
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357 req.onreadystatechange = function () { |
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358 if (req.readyState != 4 || req.status != 200) |
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359 return; |
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360 var reply = JSON.parse(req.responseText); |
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361 if (reply.t == 'l') { |
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362 /* Success */ |
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363 termemu.sessid = reply.id; |
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364 termemu.resize(reply.h, reply.w); |
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365 setTitle("Playing as " + loginmsg["name"]); |
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366 debug(1, "Logged in with id " + termemu.sessid); |
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367 document.getElementById("loginform").style.display = "none"; |
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368 getData(); |
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369 } |
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370 else if (reply.t == 'E') { |
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371 debug(1, "Could not start game: " + reply.s); |
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372 document.getElementById("input_name").value = ""; |
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373 document.getElementById("input_pw").value = ""; |
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374 } |
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375 }; |
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376 req.open('POST', '/login', true); |
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377 req.send(JSON.stringify(loginmsg)); |
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378 return; |
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379 } |
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380 |
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381 function logout() { |
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382 if (termemu.sessid == null) |
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383 return; |
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384 termemu.sessid = null; |
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385 setTitle("Game over."); |
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386 nsend = 0; |
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387 nrecv = 0; |
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388 msgQ = []; |
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389 document.getElementById("loginform").style.display = "block"; |
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390 return; |
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391 } |
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392 |
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393 function stop() { |
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394 var req = new XMLHttpRequest(); |
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395 req.onreadystatechange = function () { |
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396 if (req.readyState == 4 && req.status == 200) { |
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397 processMsg(req.responseText); |
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398 return; |
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399 } |
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400 }; |
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401 req.open('POST', '/feed', true); |
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402 req.send(JSON.stringify({"id": termemu.sessid, "t": "q"})); |
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403 return; |
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404 } |
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405 |
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406 function debug(level, msg) { |
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407 if (level < debugSuppress) |
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408 return; |
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409 var msgdiv = document.createElement("div"); |
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410 var msgtext = document.createTextNode(msg); |
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411 msgdiv.appendChild(msgtext); |
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412 document.getElementById("debug").appendChild(msgdiv); |
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413 return; |
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414 } |
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415 |
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416 function textsize(larger) { |
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417 var cssSize = termemu.view.style.fontSize; |
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418 if (!cssSize) { |
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419 return; |
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420 } |
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421 var match = cssSize.match(/\d*/); |
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422 if (!match) { |
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423 return; |
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424 } |
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425 var csize = Number(match[0]); |
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426 var nsize; |
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427 if (larger) { |
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428 if (csize >= 48) |
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429 nsize = 48; |
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430 else if (csize >= 20) |
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431 nsize = csize + 4; |
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432 else if (csize >= 12) |
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433 nsize = csize + 2; |
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434 else if (csize >= 8) |
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435 nsize = csize + 1; |
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436 else |
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437 nsize = 8; |
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438 } |
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439 else { |
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440 if (csize <= 8) |
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441 nsize = 8; |
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442 else if (csize <= 12) |
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443 nsize = csize - 1; |
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444 else if (csize <= 20) |
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445 nsize = csize - 2; |
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446 else if (csize <= 48) |
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447 nsize = csize - 4; |
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448 else |
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449 nsize = 48; |
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450 } |
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451 document.getElementById("term").style.fontSize = nsize.toString() + "px"; |
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452 termemu.fixsize(); |
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453 debug(1, "Changing font size to " + nsize.toString()); |
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454 return; |
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455 } |
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456 |
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457 function bell(on) { |
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458 var imgnode = document.getElementById("bell"); |
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459 if (on) { |
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460 imgnode.style.visibility = "visible"; |
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461 window.setTimeout(bell, 1500, false); |
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462 } |
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463 else |
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464 imgnode.style.visibility = "hidden"; |
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465 return; |
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466 } |