Mercurial > repos > tabletprog
annotate types.js @ 100:9db0e3533b23
Some work on parameterized types
| author | Mike Pavone <pavone@retrodev.com> |
|---|---|
| date | Wed, 08 Aug 2012 09:19:14 -0700 |
| parents | b58b19c455ec |
| children | 5d15b91e738a |
| rev | line source |
|---|---|
| 99 | 1 function anytype() {}; |
| 2 anytype.prototype.satisfiedBy = function(type) { | |
| 3 return true; | |
| 4 }; | |
| 5 anytype.prototype.str = function(indent) { | |
| 6 if (indent === undefined) { | |
| 7 indent = ''; | |
| 8 } | |
| 9 return indent + 'any\n'; | |
| 10 }; | |
| 11 anytype.prototype.id = 0; | |
| 12 anytype.prototype.callable = true; | |
| 13 anytype.prototype.replaceParams = function() { return this; }; | |
| 14 var any = new anytype(); | |
| 15 | |
| 16 function typeparam(name, base) | |
| 17 { | |
| 18 this.name = name; | |
| 19 this.base = base; | |
| 20 this.callable = base.callable; | |
| 21 } | |
| 22 typeparam.prototype.replaceParams = function(paramtypes) { | |
| 23 if (!(this.name in paramtypes)) { | |
| 24 return this; | |
| 25 } | |
| 26 if (!this.base.satisfiedBy(paramtypes[this.name])) { | |
| 27 throw new Error('param ' + this.name + ' has base type ' + this.base.str() + ' which is not satisfied by ' + paramtypes[this.name].str()); | |
| 28 } | |
| 29 return paramtypes[this.name]; | |
| 30 }; | |
| 31 typeparam.prototype.satisfiedBy = function(type) { | |
| 32 return this.base.satisfiedBy(type); | |
| 33 }; | |
| 34 typeparam.prototype.str = function(indent) { | |
| 35 return indent + 'param ' + this.name + '\n'; | |
| 36 }; | |
| 37 | |
| 38 var nexttypeid = 1; | |
| 39 | |
| 40 function objecttype() | |
| 41 { | |
| 42 this.messages = {}; | |
| 43 this.id = nexttypeid++; | |
| 44 this.typeparams = []; | |
| 45 this.satisfies_cache = {}; | |
| 46 this.satisfies_cache[this.id] = true; | |
| 47 } | |
| 48 | |
| 49 objecttype.prototype.callable = false; | |
| 50 | |
| 51 objecttype.prototype.addMessage = function(name, type) | |
| 52 { | |
| 53 this.messages[name] = type; | |
| 54 }; | |
| 55 | |
| 56 objecttype.prototype.satisfiedBy = function(type) { | |
| 57 if (type.id in this.satisfies_cache) { | |
| 58 return this.satisfies_cache[type.id]; | |
| 59 } | |
| 60 if (type.lazyinit) { | |
| 61 type.lazyinit(); | |
| 62 } | |
| 63 //temporarily set cache entry to true to prevent infinite recursion | |
| 64 this.satisfies_cache[type.id] = true; | |
| 65 var ret = true; | |
| 66 if (type.messages === undefined) { | |
|
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67 print('type has no messages'); |
| 99 | 68 ret = false; |
| 69 } | |
| 70 if (ret) { | |
| 71 for (var msgname in this.messages) { | |
| 72 if (!(msgname in type.messages) || !this.messages[msgname].satisfiedBy(type.messages[msgname])) { | |
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73 print(msgname, 'missing in type'); |
| 99 | 74 ret = false; |
| 75 break; | |
| 76 } | |
| 77 } | |
| 78 } | |
| 79 this.satisfies_cache[type.id] = ret; | |
| 80 return ret; | |
| 81 }; | |
| 82 | |
| 83 objecttype.prototype.str = function(indent) { | |
| 84 if (indent === undefined) { | |
| 85 indent = ''; | |
| 86 } | |
| 87 if (indent.length > 6) { | |
| 88 return 'max depth reached\n'; | |
| 89 } | |
| 90 var newindent = indent + '\t'; | |
| 91 var childindent = newindent + '\t' | |
| 92 var ret = indent + 'objectype {\n'; | |
| 93 for (var msgname in this.messages) { | |
| 94 ret += newindent + msgname + ':\n' + this.messages[msgname].str(childindent) | |
| 95 } | |
| 96 return ret + indent + '}\n'; | |
| 97 }; | |
| 98 | |
| 99 objecttype.prototype.replaceParams = function(paramtypes, visited) { | |
|
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100 if (visited === undefined) { |
| 99 | 101 visited = {}; |
| 102 } | |
| 103 if (this.id in visited) { | |
| 104 return visited[this.id]; | |
| 105 } | |
| 106 var me = visited[this.id] = this.clone(); | |
| 107 for (var msgname in this.messages) { | |
| 108 me.messages[msgname] = me.messages[msgname].replaceParams(paramtypes, visited); | |
| 109 } | |
| 110 return me; | |
| 111 }; | |
| 112 | |
| 113 objecttype.prototype.clone = function() { | |
| 114 var clone = new objecttype(); | |
| 115 for (var msgname in this.messages) { | |
| 116 clone.messages[msgname] = this.messages[msgname]; | |
| 117 } | |
| 118 clone.typeparams = this.typeparams; | |
| 119 return clone; | |
| 120 }; | |
| 121 | |
| 122 function lambdatype() | |
| 123 { | |
| 124 this.id = nexttypeid++; | |
| 125 this.messages = {}; | |
| 126 this.params = []; | |
| 127 this.paramlu = {}; | |
| 128 this.typeparams = []; | |
| 129 this.returntype = any; | |
| 130 this.satisfies_cache = {}; | |
| 131 this.satisfies_cache[this.id] = true; | |
| 132 } | |
| 133 | |
| 134 lambdatype.prototype.callable = true; | |
| 135 | |
| 136 lambdatype.prototype.addParam = function(name) { | |
| 137 this.paramlu[name] = this.params.length; | |
| 138 this.params.push(any); | |
| 139 }; | |
| 140 | |
| 141 lambdatype.prototype.paramType = function(name, type) { | |
| 142 this.params[this.paramlu[name]] = type; | |
| 143 }; | |
| 144 | |
| 145 lambdatype.prototype.addMessage = function(name, type) | |
| 146 { | |
| 147 this.messages[name] = type; | |
| 148 }; | |
| 149 | |
| 150 lambdatype.prototype.satisfiedBy = function(type) { | |
| 151 if (type.id in this.satisfies_cache) { | |
| 152 return this.satisfies_cache[type.id]; | |
| 153 } | |
| 154 if (type.lazyinit) { | |
| 155 type.lazyinit(); | |
| 156 } | |
| 157 //temporarily set cache entry to true to prevent infinite recursion | |
| 158 this.satisfies_cache[type.id] = true; | |
| 159 var ret = true; | |
| 160 if (!(type.callable) || this.params.length != type.params.length) { | |
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161 print('type is not callable or param length mismatch'); |
| 99 | 162 ret = false; |
| 163 } | |
| 164 if (ret) { | |
| 165 for (var i in this.params) { | |
| 166 if (i >= type.params.length || !this.params[i].satisfiedBy(type.params[i])) { | |
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167 print('param ', i, ' is not satisfied'); |
| 99 | 168 ret = false; |
| 169 break; | |
| 170 } | |
| 171 } | |
| 172 } | |
| 173 if (ret) { | |
| 174 for (var msgname in this.messages) { | |
| 175 if (!(msgname in type.messages) || !this.messages[msgname].satisfiedBy(type.messages[msgname])) { | |
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176 print('message', msgname, 'is not satisfied'); |
| 99 | 177 ret = false; |
| 178 break; | |
| 179 } | |
| 180 } | |
| 181 } | |
| 182 ret = ret && this.returntype.satisfiedBy(type.returntype); | |
| 183 this.satisfies_cache[type.id] = ret; | |
| 184 return ret; | |
| 185 } | |
| 186 | |
| 187 lambdatype.prototype.str = function(indent) { | |
| 188 if (indent === undefined) { | |
| 189 indent = ''; | |
| 190 } | |
| 191 if (indent.length > 6) { | |
| 192 return 'max depth reached\n'; | |
| 193 } | |
| 194 var newindent = indent + '\t'; | |
| 195 var childindent = newindent + '\t' | |
| 196 var ret = indent + 'lambdatype {\n' + newindent + 'params: {\n'; | |
| 197 for (var i = 0; i < this.params.length; i++) { | |
| 198 ret += childindent + i + ':\n' + this.params[i].str(childindent + '\t'); | |
| 199 } | |
| 200 ret += newindent + '}\n' + newindent + 'returntype:\n' + this.returntype.str(childindent); | |
| 201 | |
| 202 for (var msgname in this.messages) { | |
| 203 ret += newindent + msgname + ':\n' + this.messages[msgname].str(childindent) | |
| 204 } | |
| 205 return ret + indent + '}\n'; | |
| 206 }; | |
| 207 | |
| 208 lambdatype.prototype.replaceParams = function(paramtypes, visited) { | |
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209 if (visited === undefined) { |
| 99 | 210 visited = {}; |
| 211 } | |
| 212 if (this.id in visited) { | |
| 213 return visited[this.id]; | |
| 214 } | |
| 215 var me = visited[this.id] = this.clone(); | |
| 216 for (var msgname in this.messages) { | |
| 217 me.messages[msgname] = me.messages[msgname].replaceParams(paramtypes, visited); | |
| 218 } | |
| 219 return me; | |
| 220 }; | |
| 221 | |
| 222 lambdatype.prototype.clone = function() { | |
| 223 var clone = new lambdatype(); | |
| 224 for (var msgname in this.messages) { | |
| 225 clone.messages[msgname] = this.messages[msgname]; | |
| 226 } | |
| 227 clone.paramlu = this.paramlu; | |
| 228 clone.params = this.params.slice(0, this.params.length); | |
| 229 clone.returntype = this.returntype; | |
| 230 clone.typeparams = this.typeparams; | |
| 231 return clone; | |
| 232 }; | |
| 233 | |
| 234 function uniontype(a, b) | |
| 235 { | |
| 236 this.a = a; | |
| 237 this.b = b; | |
| 238 this.id = nexttypeid++; | |
| 239 this.satisfies_cache = null; | |
| 240 } | |
| 241 | |
| 242 uniontype.prototype.lazyinit = function() { | |
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243 if (this.satisfies_cache == null) { |
| 99 | 244 this.satisfies_cache = {}; |
| 245 this.satisfies_cache[this.id] = true; | |
| 246 this.messages = {}; | |
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247 if (this.a.messages !== undefined && this.b.messages !== undefined) { |
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248 for (var msgname in this.a.messages) { |
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249 if (msgname in this.b.messages) { |
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250 this.messages[msgname] = mkunion(this.a.messages[msgname], this.b.messages[msgname]); |
| 99 | 251 } |
| 252 } | |
| 253 } | |
| 254 this.callable = false; | |
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255 if (this.a.callable && this.b.callable && this.a.params.length == this.b.params.length) { |
| 99 | 256 this.callable = true; |
| 257 this.params = []; | |
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258 for (var i = 0; i < this.a.params.length; i++) { |
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259 this.params.push(mkunion(this.a.params[i], this.b.params[i])); |
| 99 | 260 } |
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261 this.returntype = mkunion(this.a.returntype, this.b.returntype); |
| 99 | 262 } |
| 263 } | |
| 264 }; | |
| 265 | |
| 266 uniontype.prototype.satisfiedBy = function(type) | |
| 267 { | |
| 268 this.lazyinit(); | |
| 269 if (type.id in this.satisfies_cache) { | |
| 270 return this.satisfies_cache[type.id]; | |
| 271 } | |
| 272 this.satisfies_cache[type.id] = true; | |
| 273 var ret = this.a.satisfiedBy(type) || this.b.satisfiedBy(type); | |
| 274 this.satisfies_cache[type.id] = ret; | |
| 275 return ret; | |
| 276 }; | |
| 277 | |
| 278 uniontype.prototype.str = function(indent) | |
| 279 { | |
| 280 if (indent === undefined) { | |
| 281 indent = ''; | |
| 282 } | |
| 283 if (indent.length > 6) { | |
| 284 return 'max depth reached\n'; | |
| 285 } | |
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286 return indent + 'Union {\n\t' + indent + this.a.str(indent+'\t') + '\t' + indent + this.b.str(indent+'\t') + indent + '}\n'; |
| 99 | 287 }; |
| 288 | |
| 289 uniontype.prototype.replaceParams = function(paramtypes, visited) { | |
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290 if (visited === undefined) { |
| 99 | 291 visited = {}; |
| 292 } | |
| 293 if (this.id in visited) { | |
| 294 return visited[this.id]; | |
| 295 } | |
| 296 var me = visited[this.id] = this.clone(); | |
| 297 me.a = me.a.replaceParams(paramtypes, visited); | |
| 298 me.b = me.b.replaceParams(paramtypes, visited); | |
| 299 return me; | |
| 300 }; | |
| 301 | |
| 302 uniontype.prototype.clone = function() { | |
| 303 return new uniontype(this.a, this.b); | |
| 304 }; | |
| 305 | |
| 306 | |
| 307 function mkunion(a, b) | |
| 308 { | |
| 309 //if b is a subtype of a, then a | b is equivalent to a | |
| 310 if (a.satisfiedBy(b)) { | |
| 311 return a; | |
| 312 } | |
| 313 //if a is a subtype of b, then a | b is equivalent to b | |
| 314 if (b.satisfiedBy(a)) { | |
| 315 return b; | |
| 316 } | |
| 317 return new uniontype(a, b); | |
| 318 } | |
| 319 | |
| 320 function withtparams(type, params) | |
| 321 { | |
| 322 this.type = type; | |
| 323 this.params = params; | |
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324 this.replaced = false; |
| 99 | 325 } |
| 326 | |
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327 withtparams.prototype = { |
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328 satisfiedBy: function(type) { |
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329 this.lazyinit(); |
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330 return this.type.satisfiedBy(type); |
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331 }, |
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332 str: function(indent) { |
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333 if (indent === undefined) { |
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334 indent = ''; |
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335 } |
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336 if (indent.length > 6) { |
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337 return 'max depth reached\n'; |
| 99 | 338 } |
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339 return this.type.str(indent) + indent + '<' + this.params.map(function(p) { return p.str(indent); }).join(', ') + '>'; |
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340 }, |
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341 replaceParams: function(paramtypes) { |
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342 var replaced = false; |
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343 for (var i in this.params) { |
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344 var newp = this.params[i].replaceParams(paramtypes); |
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345 if (newp != this.params[i]) { |
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346 replaced = true; |
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347 this.params[i] = newp; |
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348 } |
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349 } |
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350 return this; |
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351 }, |
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352 lazyinit: function() { |
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353 if (!this.replaced) { |
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354 var childptypes = {}; |
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355 for (var i in this.type.typeparams) { |
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356 print(this.type.typeparams[i], 'is', this.params[i].str()); |
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357 childptypes[this.type.typeparams[i]] = this.params[i] |
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358 } |
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359 this.type = this.type.replaceParams(childptypes, {}); |
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360 this.replaced = true; |
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361 } |
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362 }, |
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363 get messages() { |
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364 this.lazyinit(); |
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365 return this.type.messages; |
| 99 | 366 } |
| 367 }; | |
| 368 | |
| 369 function typetest() | |
| 370 { | |
| 371 var foo = new objecttype(); | |
| 372 var msgtype = new lambdatype(); | |
| 373 msgtype.addParam('fo'); | |
| 374 msgtype.returntype = foo; | |
| 375 foo.addMessage('bar', msgtype); | |
| 376 var baz = new objecttype(); | |
| 377 var msgtype2 = new lambdatype(); | |
| 378 msgtype2.addParam('fo'); | |
| 379 msgtype2.paramType('fo', foo); | |
| 380 msgtype2.returntype = baz; | |
| 381 baz.addMessage('bar', msgtype2); | |
| 382 baz.addMessage('qux', msgtype); | |
| 383 var shizzle = new objecttype(); | |
| 384 shizzle.addMessage('bar', msgtype); | |
| 385 shizzle.addMessage('boo', msgtype); | |
| 386 return {foo: foo, baz: baz, shizzle: shizzle}; | |
| 387 } | |
| 388 | |
| 389 function paramtypetest() | |
| 390 { | |
| 391 var empty = new objecttype(); | |
| 392 var tlnode = new objecttype(); | |
| 393 tlnode.typeparams = ['T']; | |
| 394 var t = new typeparam('T', any); | |
| 395 var q = new typeparam('Q', any); | |
| 396 var head = new lambdatype(); | |
|
100
9db0e3533b23
Some work on parameterized types
Mike Pavone <pavone@retrodev.com>
parents:
99
diff
changeset
|
397 head.returntype = t; |
| 99 | 398 tlnode.addMessage('head', head); |
| 399 var tail = new lambdatype(); | |
| 400 var econs = new lambdatype(); | |
| 401 econs.addParam('val'); | |
| 402 econs.typeparams = ['Q']; | |
| 403 econs.paramType('val', q); | |
| 404 econs.returntype = new withtparams(tlnode, [q]); | |
| 405 empty.addMessage('cons', econs); | |
| 406 tail.returntype = new uniontype(new withtparams(tlnode, [t]), empty); | |
| 407 tlnode.addMessage('tail', tail); | |
| 408 var cons = new lambdatype(); | |
| 409 cons.addParam('val'); | |
| 410 cons.paramType('val', t); | |
| 411 cons.returntype = new withtparams(tlnode, [t]); | |
| 412 tlnode.addMessage('cons', cons); | |
| 413 return {empty: empty, tlnode: tlnode}; | |
| 414 } | |
| 415 |