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99
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1 function anytype() {};
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2 anytype.prototype.satisfiedBy = function(type) {
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3 return true;
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4 };
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5 anytype.prototype.str = function(indent) {
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6 if (indent === undefined) {
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7 indent = '';
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8 }
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9 return indent + 'any\n';
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10 };
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11 anytype.prototype.id = 0;
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12 anytype.prototype.callable = true;
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13 anytype.prototype.replaceParams = function() { return this; };
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14 var any = new anytype();
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15
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16 function typeparam(name, base)
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17 {
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18 this.name = name;
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19 this.base = base;
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20 this.callable = base.callable;
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21 }
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22 typeparam.prototype.replaceParams = function(paramtypes) {
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23 if (!(this.name in paramtypes)) {
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24 return this;
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25 }
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26 if (!this.base.satisfiedBy(paramtypes[this.name])) {
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27 throw new Error('param ' + this.name + ' has base type ' + this.base.str() + ' which is not satisfied by ' + paramtypes[this.name].str());
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28 }
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29 return paramtypes[this.name];
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30 };
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31 typeparam.prototype.satisfiedBy = function(type) {
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32 return this.base.satisfiedBy(type);
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33 };
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34 typeparam.prototype.str = function(indent) {
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35 return indent + 'param ' + this.name + '\n';
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36 };
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37
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38 var nexttypeid = 1;
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39
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40 function objecttype()
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41 {
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42 this.messages = {};
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43 this.id = nexttypeid++;
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44 this.typeparams = [];
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45 this.satisfies_cache = {};
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46 this.satisfies_cache[this.id] = true;
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47 }
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48
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49 objecttype.prototype.callable = false;
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50
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51 objecttype.prototype.addMessage = function(name, type)
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52 {
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53 this.messages[name] = type;
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54 };
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55
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56 objecttype.prototype.satisfiedBy = function(type) {
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57 if (type.id in this.satisfies_cache) {
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58 return this.satisfies_cache[type.id];
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59 }
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60 if (type.lazyinit) {
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61 type.lazyinit();
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62 }
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63 //temporarily set cache entry to true to prevent infinite recursion
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64 this.satisfies_cache[type.id] = true;
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65 var ret = true;
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66 if (type.messages === undefined) {
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67 ret = false;
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68 }
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69 if (ret) {
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70 for (var msgname in this.messages) {
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71 if (!(msgname in type.messages) || !this.messages[msgname].satisfiedBy(type.messages[msgname])) {
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72 ret = false;
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73 break;
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74 }
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75 }
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76 }
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77 this.satisfies_cache[type.id] = ret;
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78 return ret;
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79 };
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80
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81 objecttype.prototype.str = function(indent) {
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82 if (indent === undefined) {
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83 indent = '';
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84 }
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85 if (indent.length > 6) {
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86 return 'max depth reached\n';
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87 }
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88 var newindent = indent + '\t';
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89 var childindent = newindent + '\t'
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90 var ret = indent + 'objectype {\n';
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91 for (var msgname in this.messages) {
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92 ret += newindent + msgname + ':\n' + this.messages[msgname].str(childindent)
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93 }
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94 return ret + indent + '}\n';
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95 };
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96
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97 objecttype.prototype.replaceParams = function(paramtypes, visited) {
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98 if (visisted === undefined) {
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99 visited = {};
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100 }
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101 if (this.id in visited) {
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102 return visited[this.id];
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103 }
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104 var me = visited[this.id] = this.clone();
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105 for (var msgname in this.messages) {
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106 me.messages[msgname] = me.messages[msgname].replaceParams(paramtypes, visited);
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107 }
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108 return me;
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109 };
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110
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111 objecttype.prototype.clone = function() {
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112 var clone = new objecttype();
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113 for (var msgname in this.messages) {
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114 clone.messages[msgname] = this.messages[msgname];
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115 }
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116 clone.typeparams = this.typeparams;
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117 return clone;
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118 };
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119
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120 function lambdatype()
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121 {
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122 this.id = nexttypeid++;
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123 this.messages = {};
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124 this.params = [];
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125 this.paramlu = {};
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126 this.typeparams = [];
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127 this.returntype = any;
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128 this.satisfies_cache = {};
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129 this.satisfies_cache[this.id] = true;
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130 }
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131
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132 lambdatype.prototype.callable = true;
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133
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134 lambdatype.prototype.addParam = function(name) {
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135 this.paramlu[name] = this.params.length;
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136 this.params.push(any);
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137 };
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138
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139 lambdatype.prototype.paramType = function(name, type) {
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140 this.params[this.paramlu[name]] = type;
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141 };
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142
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143 lambdatype.prototype.addMessage = function(name, type)
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144 {
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145 this.messages[name] = type;
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146 };
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147
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148 lambdatype.prototype.satisfiedBy = function(type) {
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149 if (type.id in this.satisfies_cache) {
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150 return this.satisfies_cache[type.id];
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151 }
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152 if (type.lazyinit) {
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153 type.lazyinit();
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154 }
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155 //temporarily set cache entry to true to prevent infinite recursion
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156 this.satisfies_cache[type.id] = true;
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157 var ret = true;
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158 if (!(type.callable) || this.params.length != type.params.length) {
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159 ret = false;
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160 }
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161 if (ret) {
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162 for (var i in this.params) {
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163 if (i >= type.params.length || !this.params[i].satisfiedBy(type.params[i])) {
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164 ret = false;
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165 break;
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166 }
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167 }
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168 }
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169 if (ret) {
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170 for (var msgname in this.messages) {
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171 if (!(msgname in type.messages) || !this.messages[msgname].satisfiedBy(type.messages[msgname])) {
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172 ret = false;
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173 break;
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174 }
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175 }
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176 }
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177 ret = ret && this.returntype.satisfiedBy(type.returntype);
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178 this.satisfies_cache[type.id] = ret;
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179 return ret;
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180 }
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181
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182 lambdatype.prototype.str = function(indent) {
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183 if (indent === undefined) {
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184 indent = '';
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185 }
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186 if (indent.length > 6) {
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187 return 'max depth reached\n';
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188 }
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189 var newindent = indent + '\t';
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190 var childindent = newindent + '\t'
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191 var ret = indent + 'lambdatype {\n' + newindent + 'params: {\n';
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192 for (var i = 0; i < this.params.length; i++) {
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193 ret += childindent + i + ':\n' + this.params[i].str(childindent + '\t');
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194 }
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195 ret += newindent + '}\n' + newindent + 'returntype:\n' + this.returntype.str(childindent);
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196
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197 for (var msgname in this.messages) {
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198 ret += newindent + msgname + ':\n' + this.messages[msgname].str(childindent)
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199 }
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200 return ret + indent + '}\n';
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201 };
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202
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203 lambdatype.prototype.replaceParams = function(paramtypes, visited) {
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204 if (visisted === undefined) {
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205 visited = {};
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206 }
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207 if (this.id in visited) {
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208 return visited[this.id];
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209 }
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210 var me = visited[this.id] = this.clone();
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211 for (var msgname in this.messages) {
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212 me.messages[msgname] = me.messages[msgname].replaceParams(paramtypes, visited);
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213 }
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214 return me;
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215 };
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216
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217 lambdatype.prototype.clone = function() {
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218 var clone = new lambdatype();
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219 for (var msgname in this.messages) {
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220 clone.messages[msgname] = this.messages[msgname];
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221 }
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222 clone.paramlu = this.paramlu;
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223 clone.params = this.params.slice(0, this.params.length);
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224 clone.returntype = this.returntype;
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225 clone.typeparams = this.typeparams;
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226 return clone;
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227 };
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228
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229 function uniontype(a, b)
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230 {
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231 this.a = a;
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232 this.b = b;
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233 this.id = nexttypeid++;
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234 this.satisfies_cache = null;
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235 }
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236
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237 uniontype.prototype.lazyinit = function() {
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238 if (this.satisfies_cache = null) {
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239 this.satisfies_cache = {};
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240 this.satisfies_cache[this.id] = true;
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241 this.messages = {};
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242 if (a.messages !== undefined && b.messages !== undefined) {
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243 for (var msgname in a.messages) {
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244 if (msgname in b.messages) {
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245 this.messages[msgname] = mkunion(a.messages[msgname], b.messages[msgname]);
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246 }
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247 }
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248 }
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249 this.callable = false;
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250 if (a.callable && b.callable && a.params.length == b.params.length) {
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251 this.callable = true;
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252 this.params = [];
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253 for (var i = 0; i < a.params.length; i++) {
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254 this.params.push(mkunion(a.params[i], b.params[i]));
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255 }
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256 this.returntype = mkunion(a.returntype, b.returntype);
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257 }
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258 }
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259 };
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260
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261 uniontype.prototype.satisfiedBy = function(type)
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262 {
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263 this.lazyinit();
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264 if (type.id in this.satisfies_cache) {
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265 return this.satisfies_cache[type.id];
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266 }
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267 this.satisfies_cache[type.id] = true;
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268 var ret = this.a.satisfiedBy(type) || this.b.satisfiedBy(type);
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269 this.satisfies_cache[type.id] = ret;
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270 return ret;
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271 };
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272
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273 uniontype.prototype.str = function(indent)
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274 {
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275 if (indent === undefined) {
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276 indent = '';
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277 }
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278 if (indent.length > 6) {
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279 return 'max depth reached\n';
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280 }
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281 return indent + 'Union {\n\t' + indent + this.a.str() + '\t' + indent + this.b.str() + indent + '}\n';
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282 };
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283
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284 uniontype.prototype.replaceParams = function(paramtypes, visited) {
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285 if (visisted === undefined) {
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286 visited = {};
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287 }
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288 if (this.id in visited) {
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289 return visited[this.id];
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290 }
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291 var me = visited[this.id] = this.clone();
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292 me.a = me.a.replaceParams(paramtypes, visited);
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293 me.b = me.b.replaceParams(paramtypes, visited);
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294 return me;
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295 };
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296
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297 uniontype.prototype.clone = function() {
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298 return new uniontype(this.a, this.b);
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299 };
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300
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301
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302 function mkunion(a, b)
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303 {
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304 //if b is a subtype of a, then a | b is equivalent to a
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305 if (a.satisfiedBy(b)) {
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306 return a;
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307 }
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308 //if a is a subtype of b, then a | b is equivalent to b
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309 if (b.satisfiedBy(a)) {
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310 return b;
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311 }
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312 return new uniontype(a, b);
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313 }
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314
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315 function withtparams(type, params)
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316 {
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317 this.type = type;
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318 this.params = params;
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319 }
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320
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321 withtparams.prototype.satisfiedBy = function(type) {
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322 return this.type.satisfiedBy(type);
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323 };
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324
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325 withtparams.prototype.str = function(indent) {
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326 return this.type.str(indent) + indent + '<' + this.params.map(function(p) { return p.str(indent); }).join(', ') + '>';
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327 };
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328
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329 withtparams.prototype.replaceParams = function(paramtypes) {
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330 var replaced = false;
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331 for (var i in this.params) {
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332 var newp = this.params[i].replaceParams(paramtypes);
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333 if (newp != this.params[i]) {
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334 replaced = true;
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335 this.params[i] = newp;
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336 }
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337 }
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338 if (replaced) {
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339 var childptypes = {};
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340 for (var i in this.type.typeparams) {
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341 childptypes[this.type.typeparams[i]] = this.params[i]
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342 }
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343 this.type = this.type.replaceParams(childptypes, {});
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344 }
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345 return this;
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346 };
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347
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348 function typetest()
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349 {
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350 var foo = new objecttype();
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351 var msgtype = new lambdatype();
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352 msgtype.addParam('fo');
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353 msgtype.returntype = foo;
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354 foo.addMessage('bar', msgtype);
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355 var baz = new objecttype();
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356 var msgtype2 = new lambdatype();
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357 msgtype2.addParam('fo');
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358 msgtype2.paramType('fo', foo);
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359 msgtype2.returntype = baz;
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360 baz.addMessage('bar', msgtype2);
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361 baz.addMessage('qux', msgtype);
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362 var shizzle = new objecttype();
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363 shizzle.addMessage('bar', msgtype);
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364 shizzle.addMessage('boo', msgtype);
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365 return {foo: foo, baz: baz, shizzle: shizzle};
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366 }
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367
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368 function paramtypetest()
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369 {
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370 var empty = new objecttype();
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371 var tlnode = new objecttype();
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372 tlnode.typeparams = ['T'];
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373 var t = new typeparam('T', any);
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374 var q = new typeparam('Q', any);
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375 var head = new lambdatype();
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376 head.returnType = t;
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377 tlnode.addMessage('head', head);
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378 var tail = new lambdatype();
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379 var econs = new lambdatype();
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380 econs.addParam('val');
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381 econs.typeparams = ['Q'];
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382 econs.paramType('val', q);
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383 econs.returntype = new withtparams(tlnode, [q]);
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384 empty.addMessage('cons', econs);
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385 tail.returntype = new uniontype(new withtparams(tlnode, [t]), empty);
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386 tlnode.addMessage('tail', tail);
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387 var cons = new lambdatype();
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388 cons.addParam('val');
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389 cons.paramType('val', t);
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390 cons.returntype = new withtparams(tlnode, [t]);
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391 tlnode.addMessage('cons', cons);
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392 return {empty: empty, tlnode: tlnode};
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393 }
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394
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