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annotate jsbackend.js @ 82:48daa1d3e052

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Update testarray sample to use print:
author Mike Pavone <pavone@retrodev.com>
date Sat, 21 Jul 2012 22:28:21 -0700
parents 668f533e5284
children 926b65fe92b4
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1 var mainModule;
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2 var modules = {};
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3
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4 function toobj(val)
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5 {
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6 switch(typeof val)
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7 {
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8 case 'boolean':
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9 if(val) {
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10 return mainModule.strue;
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11 } else {
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12 return mainModule.sfalse;
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13 }
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14 case 'number':
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15 return mainModule.snumber(val);
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16 }
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17 throw new Error("can't make val into object");
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18 }
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19
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20 function importSym(obj, src, key)
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21 {
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22 if(!(key in src)) {
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23 throw new Error(key +' not found in source object for import');
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24 }
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25 if(key in obj) {
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26 throw new Error(key +' already exists in target object for import')
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27 }
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28 obj[key] = src[key];
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29 }
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30
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31 function doImport(obj, src, symlist)
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32 {
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33 if (symlist === undefined) {
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34 each(src, function(key,val) {
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35 if (key != 'parent') {
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36 importSym(obj, src, key);
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37 }
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38 });
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39 } else {
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40 for (var i = 0; i < symlist.length; ++i) {
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41 importSym(obj, src, symlist[i]);
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42 }
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43 }
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44 return obj;
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45 }
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46
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47 op.prototype.toJS = function(isReceiver) {
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48 var ret = '(' + this.left.toJS() +' '+ (this.op == '=' ? '==' : this.op) +' '+ this.right.toJS() + ')';
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49 if (isReceiver) {
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50 ret = 'toobj' + ret;
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51 }
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52 return ret;
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53 };
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54
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55 function escapeJSName(name)
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56 {
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57 name = name.replace("_", "UN_").replace(":", "CN_").replace("!", "EX_").replace('?', 'QS_').replace('@', 'AT_');
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58 var reserved = {'true': true, 'false': true, 'this': true, 'if': true, 'else': true, 'NaN': true};
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59 if (name in reserved) {
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60 name = 's' + name;
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61 }
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62 return name;
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63 }
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64
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65 symbol.prototype.toJS = function() {
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66 var name = this.cleanName();
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67 if (name == 'self') {
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68 return this.symbols.selfVar();
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69 }
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70 var info = this.symbols.find(name);
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71 if (!info) {
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72 throw new Error('symbol ' + name + ' not found');
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73 }
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74 var pre = '';
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75 if (info.type == 'self') {
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76 pre = this.symbols.selfVar() + '.';
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77 } else if(info.type == 'parent') {
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78 pre = 'this';
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79 for (var i = 0; i < funinfo.depth; ++i) {
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80 pre += '.parent';
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81 }
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82 } else if (info.type == 'toplevel') {
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83 pre = 'modules.';
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84 modules[name] = false;
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85 }
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86 return pre + escapeJSName(name);
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87 }
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88
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89 intlit.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 floatlit.prototype.toJS = function() {
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94 return this.val.toString();
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95 }
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96
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97 strlit.prototype.toJS = function() {
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98 return '"' + this.val.replace('\\', '\\\\').replace('"', '\\"').replace('\n', '\\n').replace('\r', '\\r') + '"';
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99 }
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100
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101 listlit.prototype.toJS = function() {
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102 var ret = '[';
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103 each(this.val, function(idx, el) {
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104 ret += (idx ? ', ' : '') + el.toJS();
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105 });
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106 return ret + ']';
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107 }
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108
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109 funcall.prototype.toJS = function() {
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110 var name = this.name[this.name.length-1] == ':' ? this.name.substr(0, this.name.length-1) : this.name;
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111 if (name == 'foreign') {
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112 if ((this.args[0] instanceof lambda) || (this.args[0] instanceof object)) {
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113 return null;
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114 } else if(this.args[0] instanceof symbol) {
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115 return this.args[0].name;
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116 } else {
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117 throw new Error("Unexpected AST type for foreign:");
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118 }
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119 }
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120 var args = this.args.slice(0, this.args.length);
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121 if (this.receiver) {
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122 args.splice(0, 0, this.receiver);
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123 }
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124 var funinfo = this.symbols.find(name);
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125 if (!funinfo || funinfo.def instanceof setter) {
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126 var receiver = args[0];
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127 args.splice(0, 1);
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128 for (var i in args) {
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129 args[i] = args[i].toJS();
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130 }
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131 var rJS = receiver.toJS(true);
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132 if ((name[name.length-1] == '!' && args.length == 1) || (funinfo && funinfo.def instanceof setter)) {
25
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133 return '(' + rJS + '.' + escapeJSName(name.substr(0, name.length-1)) + ' = ' + args[0] + ', ' + rJS + ')';
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134 } else {
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135 var callee = rJS + '.' + escapeJSName(name);
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136 var callCode = callee + '(' + args.join(', ') + ')';
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137 if (args.length == 0) {
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138 return '(' + callee + ' instanceof Function ? ' + callCode + ' : ' + callee + ')';
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139 } else {
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140 return callCode;
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141 }
20
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142 }
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143 }
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144 var ret = '';
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145 switch(funinfo.type)
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146 {
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147 case 'self':
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148 if (args.length < funinfo.def.args.length || funinfo.def.args[0].name != 'self') {
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149 var receiver = new symbol('self', this.symbols);
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150 } else {
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151 var receiver = args[0];
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152 args.splice(0, 1);
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153 if (args.length == 0) {
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154 var rJS = receiver.toJS(true);
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155 var callee = rJS + '.' + escapeJSName(name);
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156
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157 return '(' + callee + ' instanceof Function ? ' + callee + '() : ' + callee + ')';
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158 }
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159 }
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160 ret = receiver.toJS(true) + '.';
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161 break;
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162 case 'parent':
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163 ret = 'this';
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164 for (var i = 0; i < funinfo.depth; ++i) {
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165 ret += '.parent';
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166 }
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167 break;
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168 }
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169 for (var i in args) {
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170 args[i] = args[i].toJS();
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171 }
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172 return ret + escapeJSName(name) + '(' + args.join(', ') + ')';
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173 }
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174
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175 object.prototype.toJS = function() {
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176 var messages = this.messages;
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177 var compiled = [];
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178 var imports = []
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179 for (var i in messages) {
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180 if (messages[i] instanceof funcall) {
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181 if (messages[i].name == 'import:' && messages[i].args.length == 1) {
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182 imports.push({symbols: false, src: messages[i].args[0]});
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183 } else if(messages[i].name == 'import:from:' && messages[i].args.length == 2) {
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184 var importsyms = [];
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185 each(messages[i].args[0].val, function(i, el) {
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186 if (!(el instanceof symbol)) {
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187 throw new Error('Names in import:from statement must be symbols');
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188 }
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189 importsyms.push(new strlit(el.name));
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190 });
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191 imports.push({symbols: new listlit(importsyms), src: messages[i].args[1]});
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192 } else {
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193 throw new Error('Only import and import:from calls allowed in object context');
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194 }
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195 } else {
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196 var js = messages[i].toJSObject();
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197 if (js) {
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198 compiled.push(indent(js));
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199 }
8
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200 }
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201 }
25
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202 var pre = '';
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203 var post = '';
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204 for (var i = imports.length-1; i >= 0; i--) {
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205 pre += 'doImport(';
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206 post += ', ' + imports[i].src.toJS();
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207 if (imports[i].symbols) {
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208 post += ', ' + imports[i].symbols.toJS();
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209 }
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210 post += ')';
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211 }
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212 return pre+'{\n\tparent: ' + this.symbols.parentObject() + ',\n\t' + compiled.join(',\n\t') + '\n}'+post;
8
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213 }
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214
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215 object.prototype.toJSModule = function() {
31
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216 this.populateSymbols(toplevel);
19
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217 return '(function () {\n\tvar module = ' + indent(this.toJS()) + ';\n\treturn module;\n})'
8
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218 }
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219
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220 lambda.prototype.toJS = function() {
8
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221 var args = this.args ? this.args.slice(0, this.args.length) : [];
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222 if (args.length && args[0].cleanName() == 'self') {
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223 args.splice(0, 1);
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224 }
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225 var exprs = this.expressions;
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226 for (var i in args) {
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227 args[i] = args[i].toJS();
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228 }
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229 var compiled = []
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230 for (var i in exprs) {
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231 var js = exprs[i].toJS();
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232 if (js) {
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233 compiled.push(indent(js));
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234 }
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235 }
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236 exprs = compiled;
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237 if (exprs.length) {
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238 exprs[exprs.length-1] = 'return ' + exprs[exprs.length-1] + ';';
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239 }
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240 return 'function (' + args.join(', ') + ') {\n\t' + (this.symbols.needsSelfVar ? 'var self = this;\n\t' : '') + exprs.join(';\n\t') + '\n}'
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241 };
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242 lambda.prototype.toJSModule = function() {
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243 this.populateSymbols(toplevel);
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244 return this.toJS();
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245 }
8
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246
19
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247 assignment.prototype.toJS = function() {
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248 var existing = this.symbols.find(this.symbol.name);
8
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249 var prefix = '';
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250 if (!existing) {
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251 prefix = 'var ';
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252 } else {
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253 switch (existing.type)
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254 {
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255 case 'self':
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256 prefix = 'this.';
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257 break;
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258 case 'parent':
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259 prefix = 'this.';
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260 for (var i = 0; i < existing.depth; ++i) {
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261 prefix += 'parent.';
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262 }
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263 break;
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264 }
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265 }
19
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266 var val = this.expression.toJS();
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267 if (val === null) {
8
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268 return null;
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269 }
19
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270 return prefix + this.symbol.toJS() + ' = ' + val;
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271 };
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272 assignment.prototype.toJSObject = function() {
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273 var val = this.expression.toJS();
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274 if (val === null) {
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275 return null;
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276 }
25
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277 return escapeJSName(this.symbol.name) + ': ' + val;
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278 };