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annotate interp.js @ 207:60eff5f81d9a

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Basic implementation of macros is now working
author Mike Pavone <pavone@retrodev.com>
date Tue, 19 Nov 2013 22:02:11 -0800
parents b4a9d4e405c5
children a1b4a2bc8d72
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206
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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.macroexpand(this).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 findMacro: function(name) {
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94 return null;
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95 },
206
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96 }
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97
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98 function environment(parent)
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99 {
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100 this.parent = parent;
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101 this.syms = {};
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102 this.macros = {};
206
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103 }
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104
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105 environment.prototype = {
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106 find: function(name) {
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107 if (name in this.syms) {
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108 return this.syms[name];
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109 }
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110 if (this.parent) {
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111 return this.parent.find(name);
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112 }
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113 return null;
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114 },
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115 findNoTop: function(name) {
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116 if (name in this.syms) {
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117 return this.syms[name];
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118 }
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119 if (this.parent) {
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120 return this.parent.findNoTop(name);
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121 }
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122 return null;
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123 },
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124 findSet: function(name, val) {
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125 if (name in this.syms
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126 || !this.parent
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127 || !this.parent.findSetPresent(name, val)) {
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128 this.syms[name] = val;
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129 }
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130 },
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131 findSetPresent: function(name, val) {
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132 if (name in this.syms) {
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133 this.syms[name] = val;
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134 return true;
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135 }
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136 if (this.parent) {
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137 return this.parent.findSetPresent(name, val);
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138 }
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139 return false;
207
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140 },
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141 findMacro: function(name) {
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142 if (name in this.syms) {
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143 if (name in this.macros) {
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144 return this.syms[name];
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145 }
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146 return null;
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147 }
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148 if (this.parent) {
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149 return this.parent.findMacro(name);
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150 }
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151 return null;
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152 },
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153 defMacro: function(name, def) {
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154 this.syms[name] = def;
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155 this.macros[name] = true;
206
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156 }
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157 };
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158
207
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159 function makeASTNode(val)
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160 {
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161 if (typeof val == 'number') {
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162 return new intlit(val);
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163 }
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164 if (typeof val == 'string') {
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165 return new stringlit(val);
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166 }
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167 if (val instanceof Array) {
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168 return new arraylit(val);
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169 }
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170 if (val == tptrue) {
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171 return new symbol('true');
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172 }
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173 if (val == tpfalse) {
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174 return new symbol('false');
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175 }
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176 return val;
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177 }
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178
206
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179 op.prototype.eval = function(env) {
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180 var l = this.left.eval(env);
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181 var r = this.right.eval(env);
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182 var name = this.op;
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183 var fun = env.findNoTop(name);
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184 var ret;
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185 if (fun) {
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186 ret = fun(l,r)
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187 } else {
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188 ret = l['tpmeth_'+name](r);
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189 }
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190 return ret;
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191 };
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192
207
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193 op.prototype.macroexpand = function(env) {
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194 this.left = this.left.macroexpand(env);
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195 this.right = this.right.macroexpand(env);
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196 return this;
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197 };
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198
206
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199 symbol.prototype.eval = function(env) {
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200 return env.find(this.name);
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201 };
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202
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203 intlit.prototype.eval =
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204 floatlit.prototype.eval =
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205 strlit.prototype.eval =
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206 arraylit.prototype.eval = function(env) {
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207 return this.val;
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208 };
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209
207
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diff changeset
210 symbol.prototype.macroexpand =
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211 intlit.prototype.macroexpand =
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212 floatlit.prototype.macroexpand =
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213 strlit.prototype.macroexpand =
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214 arraylit.prototype.macroexpand =
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215 listlit.prototype.macroexpand = function(env) {
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diff changeset
216 return this;
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diff changeset
217 };
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diff changeset
218
206
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219 funcall.prototype.eval = function(env) {
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220 var args = [];
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221 var name = this.name;
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222 if (name[name.length-1] == ":") {
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223 name = name.substr(0, name.length-1);
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224 }
207
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diff changeset
225 if (name == 'quote') {
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diff changeset
226 if (this.receiver) {
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diff changeset
227 return this.receiver;
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diff changeset
228 }
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229 if (this.args.length) {
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230 return this.args[0];
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diff changeset
231 }
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diff changeset
232 throw new Error('quote takes an argument');
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diff changeset
233 }
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diff changeset
234 if (name == 'macro') {
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diff changeset
235 return null;
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diff changeset
236 }
206
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diff changeset
237 if (this.receiver) {
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238 args.push(this.receiver.eval(env));
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239 }
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diff changeset
240 for (var i = 0; i < this.args.length; i++) {
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241 args.push(this.args[i].eval(env));
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242 }
207
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diff changeset
243 if (name == 'eval:else') {
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diff changeset
244 try {
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diff changeset
245 var res = args[0].eval(env);
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diff changeset
246 } catch(e) {
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diff changeset
247 return args[2].call(null);
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diff changeset
248 }
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diff changeset
249 return args[1].call(null, res);
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diff changeset
250 }
206
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diff changeset
251 var fun = env.findNoTop(name);
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252 if (fun) {
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253 return fun.apply(null, args);
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diff changeset
254 } else {
207
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parents: 206
diff changeset
255 //if (typeof args[0]'tpmeth_'+name in args[0]) {
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diff changeset
256 //try {
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diff changeset
257 return args[0]['tpmeth_'+name].apply(args[0], args.slice(1));
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diff changeset
258 /*} catch(e) {
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diff changeset
259 throw new Error('Error, \n\t' + e.message.split('\n').join('\n\t') + '\ninvoking method ' + name + ' on object ' + args[0] + ' ' + JSON.stringify(Object.keys(args[0])));
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diff changeset
260 }*/
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diff changeset
261 /*} else {JSON.stringify
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diff changeset
262 throw new Error('No method named ' + name + ' on object ' + JSON.stringify(args[0]));
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diff changeset
263 }*/
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diff changeset
264 }
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diff changeset
265 };
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diff changeset
266
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diff changeset
267 funcall.prototype.macroexpand = function(env) {
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diff changeset
268 var name = this.name;
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diff changeset
269 if (name[name.length-1] == ":") {
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270 name = name.substr(0, name.length-1);
206
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271 }
207
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272 var macro = env.findMacro(name);
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273 if (this.receiver) {
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274 this.receiver = this.receiver.macroexpand(env);
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275 }
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276 for (var i = 0; i < this.args.length; i++) {
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277 this.args[i] = this.args[i].macroexpand(env);
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278 }
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279 if (!macro) {
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280 return this;
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281 }
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282 var args = [];
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283 if (this.receiver) {
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284 args.push(this.receiver);
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285 }
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286 for (var i = 0; i < this.args.length; i++) {
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287 args.push(this.args[i]);
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288 }
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289 return makeASTNode(macro.apply(null, args));
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290 };
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291
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292 object.prototype.eval = function(parentenv) {
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293 var env = new environment(parentenv);
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294 var obj = {env: env};
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295 for (var i = 0; i < this.messages.length; i++) {
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296 var msg = this.messages[i];
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297 if (msg instanceof assignment) {
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298 if (msg.expression instanceof lambda) {
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299 obj['tpmeth_' + msg.symbol.name] = msg.expression.eval(env);
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300 (function(name) {
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301 env.syms[name] = function() {
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302 return obj['tpmeth_' + name].apply(obj, arguments);
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303 };
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304 })(msg.symbol.name);
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305 } else {
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306 var makeProp = function(obj, name) {
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307 obj['tprop_' + name] = msg.expression.eval(env);
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308 name = 'tpmeth_' + name;
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309 obj[name] = function() {
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310 return this[name];
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311 };
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312 var setname = name+'!';
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313 obj[setname] = function(val) {
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314 this[setname] = val;
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315 return this;
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316 };
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317 };
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318 makeProp(obj, msg.symbol.name);
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319 }
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320 } else {
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321 throw new Error('pseudo function calls in object definitions not implemented yet');
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322 }
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323 }
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324 return obj;
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325 };
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326
207
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327 object.prototype.macroexpand = function(parentenv) {
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328 var env = new environment(parentenv);
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329 var obj = {env: env};
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330 var outmessages = [];
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331 for (var i = 0; i < this.messages.length; i++) {
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332 var msg = this.messages[i].macroexpand(env);
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333 if (msg instanceof assignment) {
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334 if (msg.expression instanceof lambda) {
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335 (function(name, expr) {
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336 env.syms[name] = function() {
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337 if (!obj['tpmeth_' + name]) {
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338 obj['tpmeth_' + name] = expr.eval(env);
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339 }
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340 return obj['tpmeth_' + name].apply(obj, arguments);
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341 };
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342 })(msg.symbol.name, msg.expression);
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343 outmessages.push(msg);
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344 } else if (msg.expression instanceof funcall && msg.expression.name == 'macro:') {
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345 env.defMacro(msg.symbol.name, msg.expression.args[0].eval(env));
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346 } else {
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347 outmessages.push(msg);
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348 /*
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349 var makeProp = function(obj, name) {
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350 obj['tprop_' + name] = msg.expression.eval(env);
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351 name = 'tpmeth_' + name;
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352 obj[name] = function() {
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353 return this[name];
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354 };
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355 var setname = name+'!';
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356 obj[setname] = function(val) {
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357 this[setname] = val;
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358 return this;
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359 };
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360 };
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361 makeProp(obj, msg.symbol.name);*/
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362 }
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363 } else {
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364 outmessages.push(msg);
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365 //throw new Error('pseudo function calls in object definitions not implemented yet');
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366 }
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367 }
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368 this.messages = outmessages;
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369 return this;
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370 };
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371
206
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372 lambda.prototype.eval = function(parentenv) {
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373 var args = this.args;
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374 var exprs = this.expressions;
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375 return function() {
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376 var env = new environment(parentenv);
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377 for (var i = 0, j = 0; i < arguments.length && j < args.length; i++, j++) {
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378 while (j < args.length && args[j].cleanName() == 'self') {
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379 j++;
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380 }
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381 env.syms[args[j].cleanName()] = arguments[i];
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382 }
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383 if (this != null && (args.length == 0 || args[0].cleanName() != 'self')) {
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384 env.syms['self'] = this;
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385 }
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386 var res = null;
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387 for (var i = 0; i < exprs.length; i++) {
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388 res = exprs[i].eval(env);
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389 }
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390 return res;
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391 };
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392 };
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393
207
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394 lambda.prototype.macroexpand = function(parentenv) {
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395 var env = new environment(parentenv);
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396 for (var i = 0; i < this.args.length; i++) {
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397 env.syms[this.args[i].cleanName()] = {};
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398 }
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399 for (var i = 0; i < this.expressions.length; i++) {
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400 var expr = this.expressions[i];
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401 if (expr instanceof assignment) {
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402 if (expr.expression instanceof funcall && expr.expression.name == 'macro:') {
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403 env.defMacro(expr.symbol.name, exp.expression.args[0].eval(env));
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404 } else {
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405 env.syms[expr.symbol.cleanName()] = {};
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406 this.expressions[i] = expr.macroexpand(env);
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407 }
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408 } else {
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409 this.expressions[i] = expr.macroexpand(env);
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410 }
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411 }
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412 return this;
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413 };
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414
206
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415 assignment.prototype.eval = function(env) {
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416 var val = this.expression.eval(env);
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417 env.findSet(this.symbol.name, val);
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418 return val;
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419 };
207
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420
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421 assignment.prototype.macroexpand = function(env) {
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422 this.expression = this.expression.macroexpand(env);
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423 return this;
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424 };