Mercurial > repos > tabletprog
annotate interp.js @ 206:b4a9d4e405c5
Implemented a simple interpreter to be used for macro expansion and a driver for testing it
author | Mike Pavone <pavone@retrodev.com> |
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date | Wed, 23 Oct 2013 19:10:03 -0700 |
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children | 60eff5f81d9a |
rev | line source |
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206
b4a9d4e405c5
Implemented a simple interpreter to be used for macro expansion and a driver for testing it
Mike Pavone <pavone@retrodev.com>
parents:
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1 Number.prototype['tpmeth_+'] = function(other) { |
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2 return this + other; |
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3 }; |
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4 Number.prototype['tpmeth_-'] = function(other) { |
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5 return this - other; |
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6 }; |
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7 Number.prototype['tpmeth_*'] = function(other) { |
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8 return this * other; |
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9 }; |
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10 Number.prototype['tpmeth_/'] = function(other) { |
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11 return this / other; |
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12 }; |
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13 Number.prototype['tpmeth_='] = function(other) { |
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14 return this == other ? tptrue : tpfalse; |
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15 }; |
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16 Number.prototype['tpmeth_>'] = function(other) { |
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17 return this > other ? tptrue : tpfalse; |
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18 }; |
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19 Number.prototype['tpmeth_<'] = function(other) { |
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20 return this < other ? tptrue : tpfalse; |
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21 }; |
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22 Number.prototype['tpmeth_>='] = function(other) { |
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23 return this >= other ? tptrue : tpfalse; |
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24 }; |
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25 Number.prototype['tpmeth_<='] = function(other) { |
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26 return this <= other ? tptrue : tpfalse; |
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27 }; |
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28 Number.prototype.tpmeth_string = function() { |
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29 return '' + this; |
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30 }; |
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31 Number.prototype.tpmeth_print = function() { |
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32 print(this); |
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33 }; |
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34 |
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35 String.prototype['tpmeth_.'] = function(other) { |
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36 return this + other; |
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37 }; |
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38 String.prototype['tpmeth_='] = function(other) { |
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39 return this == other ? tptrue : tpfalse; |
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40 }; |
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41 String.prototype.tpmeth_print = function() { |
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42 print(this); |
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43 } |
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44 |
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45 var tptrue = null; |
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46 var tpfalse = null; |
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47 |
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48 function topenv(moduledirs) |
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49 { |
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50 this.names = {}; |
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51 this.modules = {}; |
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52 for (var dirnum in moduledirs) { |
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53 var results = os.system("ls", [moduledirs[dirnum]]).split('\n'); |
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54 for (var i in results) { |
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55 var tpidx = results[i].indexOf('.tp') |
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56 if (tpidx > 0 && tpidx == results[i].length - 3) { |
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57 this.names[results[i].substr(0, tpidx)] = moduledirs[dirnum] + "/" + results[i]; |
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58 } |
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59 } |
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60 } |
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61 if (!tptrue) { |
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62 tptrue = this.find('true'); |
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63 tptrue.valueOf = function() { |
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64 return true; |
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65 }; |
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66 } |
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67 if (!tpfalse) { |
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68 tpfalse = this.find('false'); |
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69 tpfalse.valueOf = function() { |
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70 return false; |
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71 }; |
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72 } |
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73 } |
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74 |
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75 topenv.prototype = { |
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76 find: function(name) { |
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77 if (name in this.modules) { |
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78 return this.modules[name]; |
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79 } |
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80 if (name in this.names) { |
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81 var parsed = parseFile(this.names[name]); |
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82 this.modules[name] = parsed.eval(this); |
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83 return this.modules[name]; |
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84 } |
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85 return null; |
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86 }, |
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87 findNoTop: function(name) { |
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88 return null; |
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89 }, |
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90 findSetPresent: function(name, val) { |
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91 return false; |
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92 } |
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93 } |
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94 |
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95 function environment(parent) |
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96 { |
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97 this.parent = parent; |
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98 this.syms = {}; |
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99 } |
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100 |
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101 environment.prototype = { |
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102 find: function(name) { |
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103 if (name in this.syms) { |
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104 return this.syms[name]; |
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105 } |
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106 if (this.parent) { |
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107 return this.parent.find(name); |
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108 } |
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109 return null; |
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110 }, |
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111 findNoTop: function(name) { |
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112 if (name in this.syms) { |
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113 return this.syms[name]; |
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114 } |
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115 if (this.parent) { |
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116 return this.parent.findNoTop(name); |
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117 } |
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118 return null; |
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119 }, |
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120 findSet: function(name, val) { |
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121 if (name in this.syms |
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122 || !this.parent |
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123 || !this.parent.findSetPresent(name, val)) { |
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124 this.syms[name] = val; |
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125 } |
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126 }, |
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127 findSetPresent: function(name, val) { |
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128 if (name in this.syms) { |
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129 this.syms[name] = val; |
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130 return true; |
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131 } |
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132 if (this.parent) { |
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133 return this.parent.findSetPresent(name, val); |
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134 } |
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135 return false; |
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136 } |
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137 }; |
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138 |
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139 op.prototype.eval = function(env) { |
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140 var l = this.left.eval(env); |
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141 var r = this.right.eval(env); |
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142 var name = this.op; |
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143 var fun = env.findNoTop(name); |
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144 var ret; |
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145 if (fun) { |
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146 ret = fun(l,r) |
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147 } else { |
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148 ret = l['tpmeth_'+name](r); |
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149 } |
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150 return ret; |
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151 }; |
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152 |
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153 symbol.prototype.eval = function(env) { |
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154 return env.find(this.name); |
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155 }; |
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156 |
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157 intlit.prototype.eval = |
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158 floatlit.prototype.eval = |
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159 strlit.prototype.eval = |
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160 arraylit.prototype.eval = function(env) { |
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161 return this.val; |
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162 }; |
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163 |
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164 funcall.prototype.eval = function(env) { |
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165 var args = []; |
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166 var name = this.name; |
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167 if (name[name.length-1] == ":") { |
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168 name = name.substr(0, name.length-1); |
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169 } |
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170 if (this.receiver) { |
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171 args.push(this.receiver.eval(env)); |
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172 } |
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173 for (var i = 0; i < this.args.length; i++) { |
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174 args.push(this.args[i].eval(env)); |
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175 } |
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176 var fun = env.findNoTop(name); |
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177 if (fun) { |
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178 return fun.apply(null, args); |
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179 } else { |
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180 return args[0]['tpmeth_'+name].apply(args[0], args.slice(1)); |
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181 } |
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182 }; |
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183 |
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184 object.prototype.eval = function(parentenv) { |
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185 var env = new environment(parentenv); |
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186 var obj = {env: env}; |
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187 for (var i = 0; i < this.messages.length; i++) { |
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188 var msg = this.messages[i]; |
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189 if (msg instanceof assignment) { |
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190 if (msg.expression instanceof lambda) { |
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191 obj['tpmeth_' + msg.symbol.name] = msg.expression.eval(env); |
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192 (function(name) { |
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193 env.syms[name] = function() { |
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194 return obj['tpmeth_' + name].apply(obj, arguments); |
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195 }; |
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196 })(msg.symbol.name); |
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197 } else { |
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198 var makeProp = function(obj, name) { |
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199 obj['tprop_' + name] = msg.expression.eval(env); |
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200 name = 'tpmeth_' + name; |
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201 obj[name] = function() { |
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202 return this[name]; |
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203 }; |
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204 var setname = name+'!'; |
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205 obj[setname] = function(val) { |
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206 this[setname] = val; |
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207 return this; |
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208 }; |
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209 }; |
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210 makeProp(obj, msg.symbol.name); |
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211 } |
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212 } else { |
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213 throw new Error('pseudo function calls in object definitions not implemented yet'); |
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214 } |
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215 } |
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216 return obj; |
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217 }; |
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218 |
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219 lambda.prototype.eval = function(parentenv) { |
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220 var args = this.args; |
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221 var exprs = this.expressions; |
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222 return function() { |
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223 var env = new environment(parentenv); |
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224 for (var i = 0, j = 0; i < arguments.length && j < args.length; i++, j++) { |
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225 while (j < args.length && args[j].cleanName() == 'self') { |
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226 j++; |
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227 } |
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228 env.syms[args[j].cleanName()] = arguments[i]; |
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229 } |
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230 if (this != null && (args.length == 0 || args[0].cleanName() != 'self')) { |
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231 env.syms['self'] = this; |
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232 } |
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233 var res = null; |
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234 for (var i = 0; i < exprs.length; i++) { |
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235 res = exprs[i].eval(env); |
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236 } |
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237 return res; |
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238 }; |
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239 }; |
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240 |
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241 assignment.prototype.eval = function(env) { |
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242 var val = this.expression.eval(env); |
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243 env.findSet(this.symbol.name, val); |
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244 return val; |
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245 }; |