Mercurial > hg > rlgwebd
annotate shterm.js @ 1:9bef0941c6dd
Add a few comments.
author | John "Elwin" Edwards <elwin@sdf.org> |
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date | Sun, 06 May 2012 09:04:14 -0700 |
parents | bd412f63ce0d |
children | ee22eb9ab009 |
rev | line source |
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1 | 1 /* shterm.js: browser-side JavaScript to handle I/O for termemu.js when it |
2 * is running a shell via the webtty.js server. | |
3 */ | |
4 | |
0
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5 // A state machine that keeps track of polling the server. |
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6 var ajaxstate = { |
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7 state: 0, |
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8 timerID: null, |
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9 clear: function () { |
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10 if (this.timerID != null) { |
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11 window.clearTimeout(this.timerID); |
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12 this.timerID = null; |
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13 } |
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14 }, |
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15 set: function (ms) { |
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16 this.clear(); |
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17 this.timerID = window.setTimeout(getData, ms); |
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18 }, |
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19 gotdata: function () { |
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20 this.set(100); |
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21 this.state = 0; |
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22 }, |
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23 gotnothing: function () { |
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24 if (this.state == 0) { |
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25 this.set(100); |
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26 this.state = 1; |
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27 } |
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28 else if (this.state == 1) { |
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29 this.set(300); |
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30 this.state = 2; |
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31 } |
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32 else if (this.state == 2) { |
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33 this.set(1000); |
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34 this.state = 3; |
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35 } |
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36 else { |
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37 this.set(5000); |
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38 this.state = 3; |
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39 } |
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40 }, |
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41 posted: function () { |
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42 this.set(100); |
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43 this.state = 0; |
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44 } |
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45 }; |
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46 |
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47 function writeData(hexstr) { |
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48 var codenum; |
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49 var codes = []; |
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50 var nc; |
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51 var u8wait = 0; /* Stores bits from previous bytes of multibyte sequences. */ |
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52 var expect = 0; /* The number of 10------ bytes expected. */ |
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53 /* UTF-8 translation. */ |
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54 for (var i = 0; i < hexstr.length; i += 2) { |
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55 nc = Number("0x" + hexstr.substr(i, 2)); |
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56 if (nc < 0x7F) { |
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57 /* 0------- */ |
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58 codes.push(nc); |
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59 /* Any incomplete sequence will be discarded. */ |
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60 u8wait = 0; |
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61 expect = 0; |
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62 } |
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63 else if (nc < 0xC0) { |
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64 /* 10------ : part of a multibyte sequence */ |
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65 if (expect > 0) { |
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66 u8wait <<= 6; |
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67 u8wait += (nc & 0x3F); |
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68 expect--; |
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69 if (expect == 0) { |
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70 codes.push(u8wait); |
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71 u8wait = 0; |
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72 } |
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73 } |
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74 else { |
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75 /* Assume an initial byte was missed. */ |
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76 u8wait = 0; |
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77 } |
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78 } |
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79 /* These will all discard any incomplete sequence. */ |
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80 else if (nc < 0xE0) { |
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81 /* 110----- : introduces 2-byte sequence */ |
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82 u8wait = (nc & 0x1F); |
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83 expect = 1; |
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84 } |
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85 else if (nc < 0xF0) { |
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86 /* 1110---- : introduces 3-byte sequence */ |
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87 u8wait = (nc & 0x0F); |
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88 expect = 2; |
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89 } |
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90 else if (nc < 0xF8) { |
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91 /* 11110--- : introduces 4-byte sequence */ |
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92 u8wait = (nc & 0x07); |
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93 expect = 3; |
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94 } |
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95 else if (nc < 0xFC) { |
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96 /* 111110-- : introduces 5-byte sequence */ |
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97 u8wait = (nc & 0x03); |
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98 expect = 4; |
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99 } |
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100 else if (nc < 0xFE) { |
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101 /* 1111110- : introduces 6-byte sequence */ |
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102 u8wait = (nc & 0x01); |
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103 expect = 5; |
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104 } |
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105 else { |
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106 /* 1111111- : should never appear */ |
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107 u8wait = 0; |
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108 expect = 0; |
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109 } |
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110 /* Supporting all 31 bits is probably overkill... */ |
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111 } |
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112 termemu.write(codes); |
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113 return; |
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114 } |
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115 |
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116 function getData() { |
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117 if (!termemu.alive) |
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118 return; |
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119 var datareq = new XMLHttpRequest(); |
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120 datareq.onreadystatechange = function () { |
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121 if (datareq.readyState == 4 && datareq.status == 200) { |
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122 var datalines = datareq.responseText.split("\n"); |
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123 if (!datalines[0]) { |
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124 return; |
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125 } |
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126 else if (datalines[0] == "E1") { |
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127 termemu.alive = false; |
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128 return; |
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129 } |
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130 else if (datalines[0].charAt(0) != 'd') { |
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131 return; |
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132 } |
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133 if (datalines[1]) { |
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134 writeData(datalines[1]); |
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135 ajaxstate.gotdata(); |
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136 } |
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137 else { |
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138 ajaxstate.gotnothing(); |
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139 } |
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140 return; |
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141 } |
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142 }; |
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143 datareq.open('GET', '/feed', true); |
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144 datareq.send(null); |
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145 return; |
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146 } |
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147 |
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148 function postResponseHandler() { |
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149 if (this.readyState == 4 && this.status == 200) { |
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150 var datalines = this.responseText.split("\n"); |
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151 if (!datalines[0]) |
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152 return; |
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153 else if (datalines[0] == "E1") { |
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154 termemu.alive = false; |
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155 return; |
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156 } |
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157 else if (datalines[0].charAt(0) != "d") |
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158 return; |
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159 /* It is a data message */ |
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160 if (datalines[1]) { |
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161 writeData(datalines[1]); |
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162 } |
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163 ajaxstate.posted(); |
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164 return; |
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165 } |
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166 } |
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167 |
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168 function sendback(str) { |
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169 /* For responding to terminal queries. */ |
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170 var datareq = new XMLHttpRequest(); |
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171 datareq.onreadystatechange = postResponseHandler; |
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172 datareq.open('POST', '/feed', true); |
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173 datareq.send("keys=" + str); |
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174 return; |
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175 } |
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176 |
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177 /* ASCII values of keys 0-9. */ |
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178 var numShifts = [41, 33, 64, 35, 36, 37, 94, 38, 42, 40]; |
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179 |
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180 var keyHexCodes = { |
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181 init: function () { |
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182 this[KeyboardEvent.DOM_VK_RETURN] = ["0d", "0d"]; |
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183 this[KeyboardEvent.DOM_VK_SPACE] = ["20", "20"]; |
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184 this[KeyboardEvent.DOM_VK_TAB] = ["09", "09"]; |
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185 this[KeyboardEvent.DOM_VK_BACK_QUOTE] = ["60", "7e"]; |
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186 this[KeyboardEvent.DOM_VK_OPEN_BRACKET] = ["5b", "7b"]; |
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187 this[KeyboardEvent.DOM_VK_CLOSE_BRACKET] = ["5d", "7d"]; |
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188 this[KeyboardEvent.DOM_VK_BACK_SLASH] = ["5c", "7c"]; |
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189 this[KeyboardEvent.DOM_VK_SEMICOLON] = ["3b", "3a"]; |
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190 this[KeyboardEvent.DOM_VK_QUOTE] = ["27", "22"]; |
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191 this[KeyboardEvent.DOM_VK_COMMA] = ["2c", "3c"]; |
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192 this[KeyboardEvent.DOM_VK_PERIOD] = ["2e", "3e"]; |
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193 this[KeyboardEvent.DOM_VK_SLASH] = ["2f", "3f"]; |
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194 this[KeyboardEvent.DOM_VK_EQUALS] = ["3d", "2b"]; |
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195 this[KeyboardEvent.DOM_VK_SUBTRACT] = ["2d", "5f"]; |
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196 this[KeyboardEvent.DOM_VK_BACK_SPACE] = ["08", "08"]; |
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197 this[KeyboardEvent.DOM_VK_ESCAPE] = ["1b", "1b"]; |
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198 this[KeyboardEvent.DOM_VK_PAGE_UP] = ["1b5b357e", "1b5b357e"]; |
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199 this[KeyboardEvent.DOM_VK_PAGE_DOWN] = ["1b5b367e", "1b5b367e"]; |
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200 this.appCursor(false); |
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201 this.appKeypad(false); |
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202 }, |
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203 /* Multi-char control sequences! Neat! */ |
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204 appCursor: function (on) { |
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205 /* Aren't special keys vile? */ |
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206 if (on) { |
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207 this[KeyboardEvent.DOM_VK_LEFT] = ["1b4f44", "1b4f44"]; |
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208 this[KeyboardEvent.DOM_VK_RIGHT] = ["1b4f43", "1b4f43"]; |
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209 this[KeyboardEvent.DOM_VK_UP] = ["1b4f41", "1b4f41"]; |
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210 this[KeyboardEvent.DOM_VK_DOWN] = ["1b4f42", "1b4f42"]; |
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211 this[KeyboardEvent.DOM_VK_END] = ["1b4f46", "1b4f46"]; |
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212 this[KeyboardEvent.DOM_VK_HOME] = ["1b4f48", "1b4f48"]; |
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213 } |
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214 else { |
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215 this[KeyboardEvent.DOM_VK_LEFT] = ["1b5b44", "1b5b44"]; |
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216 this[KeyboardEvent.DOM_VK_RIGHT] = ["1b5b43", "1b5b43"]; |
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217 this[KeyboardEvent.DOM_VK_UP] = ["1b5b41", "1b5b41"]; |
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218 this[KeyboardEvent.DOM_VK_DOWN] = ["1b5b42", "1b5b42"]; |
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219 this[KeyboardEvent.DOM_VK_END] = ["1b5b46", "1b5b46"]; |
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220 this[KeyboardEvent.DOM_VK_HOME] = ["1b5b48", "1b5b48"]; |
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221 } |
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222 }, |
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223 appKeypad: function (on) { |
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224 /* In theory, these should produce either numerals or the k[a-c][1-3] |
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225 * sequences. Since we can't count on the terminfo description actually |
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226 * containing those sequences, pretend they're just arrow keys etc. |
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227 */ |
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228 this[KeyboardEvent.DOM_VK_NUMPAD1] = ["1b4f46", "1b4f46"]; |
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229 this[KeyboardEvent.DOM_VK_NUMPAD2] = ["1b4f42", "1b4f42"]; |
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230 this[KeyboardEvent.DOM_VK_NUMPAD3] = ["1b5b367e", "1b5b367e"]; |
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231 this[KeyboardEvent.DOM_VK_NUMPAD4] = ["1b4f44", "1b4f44"]; |
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232 this[KeyboardEvent.DOM_VK_NUMPAD5] = ["1b5b45", "1b5b45"]; |
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233 this[KeyboardEvent.DOM_VK_NUMPAD6] = ["1b4f43", "1b4f43"]; |
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234 this[KeyboardEvent.DOM_VK_NUMPAD7] = ["1b4f48", "1b4f48"]; |
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235 this[KeyboardEvent.DOM_VK_NUMPAD8] = ["1b4f41", "1b4f41"]; |
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236 this[KeyboardEvent.DOM_VK_NUMPAD9] = ["1b5b357e", "1b5b357e"]; |
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237 return; |
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238 } |
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239 }; |
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240 |
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241 function sendkey(ev) { |
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242 var keynum = ev.keyCode; |
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243 var code; |
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244 if (keynum >= ev.DOM_VK_A && keynum <= ev.DOM_VK_Z) { |
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245 /* Letters. This assumes the codes are 65-90. */ |
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246 if (ev.ctrlKey) |
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247 keynum -= 64; |
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248 else if (!ev.shiftKey) |
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249 keynum += 32; |
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250 code = keynum.toString(16); |
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251 if (code.length < 2) |
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252 code = "0" + code; |
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253 } |
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254 else if (keynum >= ev.DOM_VK_0 && keynum <= ev.DOM_VK_9) { |
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255 /* The number row. */ |
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256 if (ev.shiftKey) { |
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257 code = numShifts[keynum - 48].toString(16); |
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258 } |
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259 else { |
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260 code = keynum.toString(16); |
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261 } |
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262 } |
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263 else if (keynum in keyHexCodes) { |
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264 if (ev.shiftKey) |
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265 code = keyHexCodes[keynum][1]; |
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266 else |
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267 code = keyHexCodes[keynum][0]; |
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268 } |
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269 else if (keynum == ev.DOM_VK_SHIFT || keynum == ev.DOM_VK_CONTROL || |
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270 keynum == ev.DOM_VK_ALT || keynum == ev.DOM_VK_CAPS_LOCK) { |
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271 return; |
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272 } |
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273 else { |
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274 debug(1, "Ignoring keycode " + keynum); |
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275 return; |
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276 } |
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277 if (termemu.alive) |
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278 ev.preventDefault(); |
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279 var datareq = new XMLHttpRequest(); |
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280 datareq.onreadystatechange = postResponseHandler; |
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281 datareq.open('POST', '/feed', true); |
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282 datareq.send("keys=" + code); |
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283 //dkey(code); |
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284 return; |
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285 } |
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286 |
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287 var charshifts = { '-': "5f", '=': "2b", '[': "7b", ']': "7d", '\\': "7c", |
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288 ';': "3a", '\'': "22", ',': "3c", '.': "3e", '/': "3f", '`': "7e" |
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289 } |
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290 |
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291 function vkey(c) { |
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292 var keystr; |
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293 if (c.match(/^[a-z]$/)) { |
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294 if (termemu.ctrlp()) { |
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295 var n = c.charCodeAt(0) - 96; |
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296 keystr = n.toString(16); |
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297 if (keystr.length < 2) |
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298 keystr = "0" + keystr; |
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299 } |
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300 else if (termemu.shiftp()) |
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301 keystr = c.toUpperCase().charCodeAt(0).toString(16); |
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302 else |
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303 keystr = c.charCodeAt(0).toString(16); |
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304 } |
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305 else if (c.match(/^[0-9]$/)) { |
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306 if (termemu.shiftp()) |
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307 keystr = numShifts[c.charCodeAt(0) - 48].toString(16); |
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308 else |
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309 keystr = c.charCodeAt(0).toString(16); |
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310 } |
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311 else if (c == '\n') |
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312 keystr = "0a"; |
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313 else if (c == '\t') |
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314 keystr = "09"; |
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315 else if (c == '\b') |
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316 keystr = "08"; |
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317 else if (c == ' ') |
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318 keystr = "20"; |
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319 else if (c in charshifts) { |
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320 if (termemu.shiftp()) |
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321 keystr = charshifts[c]; |
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322 else |
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323 keystr = c.charCodeAt(0).toString(16); |
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324 } |
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325 else |
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326 return; |
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327 //writeData("Sending " + keystr); |
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328 var datareq = new XMLHttpRequest(); |
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329 datareq.onreadystatechange = postResponseHandler; |
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330 datareq.open('POST', '/feed', true); |
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331 datareq.send("keys=" + keystr); |
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332 return; |
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333 } |
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334 |
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335 function setup() { |
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336 keyHexCodes.init(); |
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337 termemu.init("termwrap"); |
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338 setTitle("Not connected."); |
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339 return; |
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340 } |
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341 |
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342 function toggleshift() { |
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343 termemu.toggleshift(); |
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344 keydiv = document.getElementById("shiftkey"); |
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345 if (termemu.shiftp()) |
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346 keydiv.className = "keysel"; |
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347 else |
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348 keydiv.className = "key"; |
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349 return; |
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John "Elwin" Edwards <elwin@sdf.org>
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350 } |
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351 |
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352 function togglectrl() { |
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353 termemu.togglectrl(); |
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354 keydiv = document.getElementById("ctrlkey"); |
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355 if (termemu.ctrlp()) |
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356 keydiv.className = "keysel"; |
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357 else |
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358 keydiv.className = "key"; |
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359 return; |
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360 } |
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361 |
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John "Elwin" Edwards <elwin@sdf.org>
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362 function login() { |
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363 if (termemu.alive) |
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364 return; |
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John "Elwin" Edwards <elwin@sdf.org>
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365 var req = new XMLHttpRequest(); |
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366 req.onreadystatechange = function () { |
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367 if (req.readyState == 4 && req.status == 200) { |
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368 var datalines = req.responseText.split("\n"); |
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369 if (datalines[0] == 'l1') { |
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370 /* Success */ |
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371 termemu.alive = true; |
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372 setTitle("Logged in"); |
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373 debug(1, "Logged in with id " + datalines[1]); |
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374 getData(); |
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375 return; |
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376 } |
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parents:
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|
377 return; |
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John "Elwin" Edwards <elwin@sdf.org>
parents:
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|
378 } |
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parents:
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379 }; |
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380 req.open('POST', '/login', true); |
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381 req.send("login=login"); |
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parents:
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|
382 return; |
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John "Elwin" Edwards <elwin@sdf.org>
parents:
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|
383 } |
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parents:
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|
384 |
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John "Elwin" Edwards <elwin@sdf.org>
parents:
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385 function stop() { |
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386 var req = new XMLHttpRequest(); |
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387 req.onreadystatechange = function () { |
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388 if (req.readyState == 4 && req.status == 200) { |
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389 var datalines = req.responseText.split("\n"); |
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390 /* Figure out whether or not it worked. */ |
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391 termemu.alive = false; |
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392 return; |
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393 } |
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394 }; |
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395 req.open('POST', '/feed', true); |
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396 req.send("quit=quit"); |
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397 return; |
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398 } |
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399 |
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400 function setTitle(tstr) { |
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401 var titlespan = document.getElementById("ttitle"); |
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402 var tnode = document.createTextNode(tstr); |
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403 if (titlespan.childNodes.length == 0) |
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404 titlespan.appendChild(tnode); |
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405 else |
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406 titlespan.replaceChild(tnode, titlespan.childNodes[0]); |
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407 return; |
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408 } |
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409 |
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410 function debug(level, msg) { |
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411 if (level < debugSuppress) |
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412 return; |
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413 var msgdiv = document.createElement("div"); |
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414 var msgtext = document.createTextNode(msg); |
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415 msgdiv.appendChild(msgtext); |
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416 document.getElementById("debug").appendChild(msgdiv); |
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417 return; |
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418 } |
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419 |
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420 /* This should be a termemu method. */ |
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421 function textsize(larger) { |
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422 var cssSize = document.getElementById("term").style.fontSize; |
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423 if (!cssSize) |
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424 return; |
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425 var match = cssSize.match(/\d*/); |
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426 if (!match) |
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427 return; |
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428 var csize = Number(match[0]); |
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429 var nsize; |
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430 if (larger) { |
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431 if (csize >= 48) |
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432 nsize = 48; |
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433 else if (csize >= 20) |
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434 nsize = csize + 4; |
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435 else if (csize >= 12) |
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436 nsize = csize + 2; |
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437 else if (csize >= 8) |
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438 nsize = csize + 1; |
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439 else |
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440 nsize = 8; |
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441 } |
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442 else { |
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443 if (csize <= 8) |
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444 nsize = 8; |
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445 else if (csize <= 12) |
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446 nsize = csize - 1; |
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447 else if (csize <= 20) |
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448 nsize = csize - 2; |
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449 else if (csize <= 48) |
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450 nsize = csize - 4; |
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451 else |
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452 nsize = 48; |
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453 } |
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454 document.getElementById("term").style.fontSize = nsize.toString() + "px"; |
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455 termemu.resize(); |
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456 debug(1, "Changing font size to " + nsize.toString()); |
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457 return; |
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458 } |
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459 |
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460 function bell(on) { |
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461 var imgnode = document.getElementById("bell"); |
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462 if (on) { |
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463 imgnode.style.visibility = "visible"; |
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464 window.setTimeout(bell, 1500, false); |
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465 } |
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466 else |
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467 imgnode.style.visibility = "hidden"; |
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468 return; |
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469 } |
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470 |
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471 function dkey(codestr) { |
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472 var dstr = "Keystring: "; |
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473 for (var i = 0; i < codestr.length; i += 2) { |
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474 code = Number("0x" + codestr.substr(i, 2)); |
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475 if (code < 32 || (code >= 127 && code < 160)) |
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476 dstr += "\\x" + code.toString(16); |
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477 else |
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478 dstr += String.fromCharCode(code); |
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479 } |
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480 debug(1, dstr); |
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481 return; |
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482 } |