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annotate jsbackend.js @ 30:608eb70fe261

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Fix some compiler bugs and do initial work on module import
author Mike Pavone <pavone@retrodev.com>
date Thu, 19 Apr 2012 19:20:21 -0700
parents 4d87c38404d6
children 668f533e5284
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1 var mainModule;
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2
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3 function toobj(val)
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4 {
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5 switch(typeof val)
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6 {
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7 case 'boolean':
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8 if(val) {
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9 return mainModule.strue;
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10 } else {
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11 return mainModule.sfalse;
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12 }
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13 case 'number':
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14 return mainModule.snumber(val);
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15 }
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16 throw new Error("can't make val into object");
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17 }
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18
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19 function importSym(obj, src, key)
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20 {
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21 if(!(key in src)) {
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22 throw new Error(key +' not found in source object for import');
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23 }
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24 if(key in obj) {
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25 throw new Error(key +' already exists in target object for import')
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26 }
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27 obj[key] = src[key];
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28 }
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29
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30 function doImport(obj, src, symlist)
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31 {
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32 if (symlist === undefined) {
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33 each(src, function(key,val) {
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34 if (key != 'parent') {
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35 importSym(obj, src, key);
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36 }
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37 });
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38 } else {
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39 for (var i = 0; i < symlist.length; ++i) {
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40 importSym(obj, src, symlist[i]);
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41 }
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42 }
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43 return obj;
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44 }
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45
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46 op.prototype.toJS = function(isReceiver) {
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47 var ret = '(' + this.left.toJS() +' '+ (this.op == '=' ? '==' : this.op) +' '+ this.right.toJS() + ')';
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48 if (isReceiver) {
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49 ret = 'toobj' + ret;
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50 }
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51 return ret;
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52 };
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53
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54 function escapeJSName(name)
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55 {
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56 name = name.replace("_", "UN_").replace(":", "CN_").replace("!", "EX_").replace('?', 'QS_').replace('@', 'AT_');
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57 var reserved = {'true': true, 'false': true, 'this': true, 'if': true, 'else': true, 'NaN': true};
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58 if (name in reserved) {
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59 name = 's' + name;
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60 }
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61 return name;
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62 }
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63
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64 symbol.prototype.toJS = function() {
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65 var name = this.cleanName();
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66 if (name == 'self') {
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67 return this.symbols.selfVar();
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68 }
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69 var info = this.symbols.find(name);
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70 if (!info) {
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71 throw new Error('symbol ' + name + ' not found');
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72 }
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73 var pre = '';
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74 if (info.type == 'self') {
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75 pre = this.symbols.selfVar() + '.';
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76 } else if(info.type == 'parent') {
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77 pre = 'this';
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78 for (var i = 0; i < funinfo.depth; ++i) {
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79 pre += '.parent';
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80 }
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81 }
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82 return pre + escapeJSName(name);
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83 }
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84
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85 intlit.prototype.toJS = function() {
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86 return this.val.toString();
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87 }
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88
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89 floatlit.prototype.toJS = function() {
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90 return this.val.toString();
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91 }
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92
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93 strlit.prototype.toJS = function() {
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94 return '"' + this.val.replace('\\', '\\\\').replace('"', '\\"').replace('\n', '\\n').replace('\r', '\\r') + '"';
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95 }
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96
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97 listlit.prototype.toJS = function() {
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98 var ret = '[';
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99 each(this.val, function(idx, el) {
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100 ret += (idx ? ', ' : '') + el.toJS();
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101 });
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102 return ret + ']';
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103 }
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104
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105 funcall.prototype.toJS = function() {
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106 var name = this.name[this.name.length-1] == ':' ? this.name.substr(0, this.name.length-1) : this.name;
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107 if (name == 'foreign') {
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108 if ((this.args[0] instanceof lambda) || (this.args[0] instanceof object)) {
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109 return null;
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110 } else if(this.args[0] instanceof symbol) {
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111 return this.args[0].name;
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112 } else {
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113 throw new Error("Unexpected AST type for foreign:");
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114 }
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115 }
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116 var args = this.args.slice(0, this.args.length);
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117 if (this.receiver) {
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118 args.splice(0, 0, this.receiver);
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119 }
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120 var funinfo = this.symbols.find(name);
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121 if (!funinfo || funinfo.def instanceof setter) {
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122 var receiver = args[0];
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123 args.splice(0, 1);
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124 for (var i in args) {
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125 args[i] = args[i].toJS();
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126 }
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127 var rJS = receiver.toJS(true);
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128 if ((name[name.length-1] == '!' && args.length == 1) || (funinfo && funinfo.def instanceof setter)) {
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129 return '(' + rJS + '.' + escapeJSName(name.substr(0, name.length-1)) + ' = ' + args[0] + ', ' + rJS + ')';
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130 } else {
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131 var callee = rJS + '.' + escapeJSName(name);
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132 var callCode = callee + '(' + args.join(', ') + ')';
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133 if (args.length == 0) {
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134 return '(' + callee + ' instanceof Function ? ' + callCode + ' : ' + callee + ')';
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135 } else {
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136 return callCode;
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137 }
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138 }
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139 }
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140 var ret = '';
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141 switch(funinfo.type)
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142 {
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143 case 'self':
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144 if (args.length < funinfo.def.args.length || funinfo.def.args[0].name != 'self') {
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145 var receiver = new symbol('self', this.symbols);
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146 } else {
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147 var receiver = args[0];
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148 args.splice(0, 1);
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149 if (args.length == 0) {
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150 var rJS = receiver.toJS(true);
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151 var callee = rJS + '.' + escapeJSName(name);
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152
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153 return '(' + callee + ' instanceof Function ? ' + callee + '() : ' + callee + ')';
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154 }
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155 }
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156 ret = receiver.toJS(true) + '.';
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157 break;
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158 case 'parent':
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159 ret = 'this';
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160 for (var i = 0; i < funinfo.depth; ++i) {
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161 ret += '.parent';
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162 }
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163 break;
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164 }
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165 for (var i in args) {
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166 args[i] = args[i].toJS();
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167 }
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168 return ret + escapeJSName(name) + '(' + args.join(', ') + ')';
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169 }
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170
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171 object.prototype.toJS = function() {
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172 var messages = this.messages;
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173 var compiled = [];
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174 var imports = []
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175 for (var i in messages) {
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176 if (messages[i] instanceof funcall) {
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177 if (messages[i].name == 'import:' && messages[i].args.length == 1) {
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178 imports.push({symbols: false, src: messages[i].args[0]});
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179 } else if(messages[i].name == 'import:from:' && messages[i].args.length == 2) {
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180 var importsyms = [];
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181 each(messages[i].args[0].val, function(i, el) {
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182 if (!(el instanceof symbol)) {
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183 throw new Error('Names in import:from statement must be symbols');
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184 }
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185 importsyms.push(new strlit(el.name));
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186 });
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187 imports.push({symbols: new listlit(importsyms), src: messages[i].args[1]});
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188 } else {
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189 throw new Error('Only import and import:from calls allowed in object context');
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190 }
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191 } else {
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192 var js = messages[i].toJSObject();
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193 if (js) {
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194 compiled.push(indent(js));
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195 }
8
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196 }
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197 }
25
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198 var pre = '';
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199 var post = '';
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200 for (var i = imports.length-1; i >= 0; i--) {
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201 pre += 'doImport(';
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202 post += ', ' + imports[i].src.toJS();
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203 if (imports[i].symbols) {
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204 post += ', ' + imports[i].symbols.toJS();
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205 }
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206 post += ')';
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207 }
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208 return pre+'{\n\tparent: ' + this.symbols.parentObject() + ',\n\t' + compiled.join(',\n\t') + '\n}'+post;
8
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209 }
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210
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211 object.prototype.toJSModule = function() {
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212 this.populateSymbols(null);
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213 return '(function () {\n\tvar module = ' + indent(this.toJS()) + ';\n\treturn module;\n})'
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214 }
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215
19
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216 lambda.prototype.toJS = function() {
8
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217 var args = this.args ? this.args.slice(0, this.args.length) : [];
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218 if (args.length && args[0].cleanName() == 'self') {
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219 args.splice(0, 1);
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220 }
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221 var exprs = this.expressions;
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222 for (var i in args) {
19
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223 args[i] = args[i].toJS();
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224 }
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225 var compiled = []
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226 for (var i in exprs) {
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227 var js = exprs[i].toJS();
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228 if (js) {
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229 compiled.push(indent(js));
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230 }
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231 }
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232 exprs = compiled;
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233 if (exprs.length) {
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234 exprs[exprs.length-1] = 'return ' + exprs[exprs.length-1] + ';';
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235 }
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236 return 'function (' + args.join(', ') + ') {\n\t' + (this.symbols.needsSelfVar ? 'var self = this;\n\t' : '') + exprs.join(';\n\t') + '\n}'
8
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237 };
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238 lambda.prototype.toJSModule = function() {
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239 this.populateSymbols(null);
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240 return this.toJS();
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241 }
8
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242
19
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243 assignment.prototype.toJS = function() {
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244 var existing = this.symbols.find(this.symbol.name);
8
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245 var prefix = '';
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246 if (!existing) {
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247 prefix = 'var ';
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248 } else {
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249 switch (existing.type)
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250 {
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251 case 'self':
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252 prefix = 'this.';
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253 break;
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254 case 'parent':
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255 prefix = 'this.';
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256 for (var i = 0; i < existing.depth; ++i) {
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257 prefix += 'parent.';
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258 }
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259 break;
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260 }
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261 }
19
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262 var val = this.expression.toJS();
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263 if (val === null) {
8
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264 return null;
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265 }
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266 return prefix + this.symbol.toJS() + ' = ' + val;
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267 };
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268 assignment.prototype.toJSObject = function() {
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269 var val = this.expression.toJS();
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270 if (val === null) {
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271 return null;
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272 }
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273 return escapeJSName(this.symbol.name) + ': ' + val;
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274 };