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annotate jsbackend.js @ 25:4d87c38404d6

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List literals, fixes to implicit self property lookup, import statement and editor improvements
author Mike Pavone <pavone@retrodev.com>
date Mon, 02 Apr 2012 22:28:48 -0700
parents 068d63627b16
children 608eb70fe261
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 }
20
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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 }
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150 ret = receiver.toJS(true) + '.';
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151 break;
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152 case 'parent':
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153 ret = 'this';
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154 for (var i = 0; i < funinfo.depth; ++i) {
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155 ret += '.parent';
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156 }
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157 break;
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158 }
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159 for (var i in args) {
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160 args[i] = args[i].toJS();
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161 }
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162 return ret + escapeJSName(name) + '(' + args.join(', ') + ')';
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163 }
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164
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165 object.prototype.toJS = function() {
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166 var messages = this.messages;
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167 var compiled = [];
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168 var imports = []
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169 for (var i in messages) {
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170 if (messages[i] instanceof funcall) {
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171 if (messages[i].name == 'import:' && messages[i].args.length == 1) {
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172 imports.push({symbols: false, src: messages[i].args[0]});
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173 } else if(messages[i].name == 'import:from:' && messages[i].args.length == 2) {
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174 var importsyms = [];
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175 each(messages[i].args[0].val, function(i, el) {
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176 if (!(el instanceof symbol)) {
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177 throw new Error('Names in import:from statement must be symbols');
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178 }
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179 importsyms.push(new strlit(el.name));
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180 });
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181 imports.push({symbols: new listlit(importsyms), src: messages[i].args[1]});
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182 } else {
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183 throw new Error('Only import and import:from calls allowed in object context');
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184 }
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185 } else {
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186 var js = messages[i].toJSObject();
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187 if (js) {
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188 compiled.push(indent(js));
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189 }
8
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190 }
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191 }
25
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192 var pre = '';
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193 var post = '';
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194 for (var i = imports.length-1; i >= 0; i--) {
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195 pre += 'doImport(';
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196 post += ', ' + imports[i].src.toJS();
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197 if (imports[i].symbols) {
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198 post += ', ' + imports[i].symbols.toJS();
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199 }
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200 post += ')';
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201 }
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202 return pre+'{\n\tparent: ' + this.symbols.parentObject() + ',\n\t' + compiled.join(',\n\t') + '\n}'+post;
8
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203 }
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204
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205 object.prototype.toJSModule = function() {
19
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206 this.populateSymbols(null);
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207 return '(function () {\n\tvar module = ' + indent(this.toJS()) + ';\n\treturn module;\n})'
8
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208 }
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209
19
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210 lambda.prototype.toJS = function() {
8
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211 var args = this.args ? this.args.slice(0, this.args.length) : [];
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212 if (args.length && args[0].cleanName() == 'self') {
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213 args.splice(0, 1);
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214 }
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215 var exprs = this.expressions;
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216 for (var i in args) {
19
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217 args[i] = args[i].toJS();
8
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218 }
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219 var compiled = []
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220 for (var i in exprs) {
19
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221 var js = exprs[i].toJS();
8
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222 if (js) {
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223 compiled.push(indent(js));
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224 }
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225 }
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226 exprs = compiled;
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227 if (exprs.length) {
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228 exprs[exprs.length-1] = 'return ' + exprs[exprs.length-1] + ';';
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229 }
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230 return 'function (' + args.join(', ') + ') {\n\t' + (this.symbols.needsSelfVar ? 'var self = this;\n\t' : '') + exprs.join(';\n\t') + '\n}'
8
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231 };
19
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232 lambda.prototype.toJSModule = function() {
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233 this.populateSymbols(null);
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234 return this.toJS();
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235 }
8
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236
19
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237 assignment.prototype.toJS = function() {
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238 var existing = this.symbols.find(this.symbol.name);
8
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239 var prefix = '';
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240 if (!existing) {
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241 prefix = 'var ';
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242 } else {
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243 switch (existing.type)
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244 {
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245 case 'self':
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246 prefix = 'this.';
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247 break;
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248 case 'parent':
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249 prefix = 'this.';
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250 for (var i = 0; i < existing.depth; ++i) {
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251 prefix += 'parent.';
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252 }
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253 break;
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254 }
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255 }
19
132c7756860e Use populateSymbols to generate symbol tables during compilation rather than populating them as we go. This change allows us to refer to symbols defined later in the input stream and also gives the symbol table logic a single home that can be used both by the compiler and editor.
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256 var val = this.expression.toJS();
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257 if (val === null) {
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258 return null;
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259 }
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260 return prefix + this.symbol.toJS() + ' = ' + val;
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261 };
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262 assignment.prototype.toJSObject = function() {
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263 var val = this.expression.toJS();
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264 if (val === null) {
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265 return null;
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266 }
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267 return escapeJSName(this.symbol.name) + ': ' + val;
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268 };