Mercurial > repos > tabletprog
annotate types.js @ 101:5d15b91e738a
Fix paramerized types. Remove debug print calls.
| author | Mike Pavone <pavone@retrodev.com> |
|---|---|
| date | Thu, 09 Aug 2012 08:09:14 -0700 |
| parents | 9db0e3533b23 |
| children | 92ff9630897a |
| 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) { | |
| 67 ret = false; | |
| 68 } | |
| 69 if (ret) { | |
| 70 for (var msgname in this.messages) { | |
| 71 if (!(msgname in type.messages) || !this.messages[msgname].satisfiedBy(type.messages[msgname])) { | |
| 72 ret = false; | |
| 73 break; | |
| 74 } | |
| 75 } | |
| 76 } | |
| 77 this.satisfies_cache[type.id] = ret; | |
| 78 return ret; | |
| 79 }; | |
| 80 | |
| 81 objecttype.prototype.str = function(indent) { | |
| 82 if (indent === undefined) { | |
| 83 indent = ''; | |
| 84 } | |
| 85 if (indent.length > 6) { | |
| 86 return 'max depth reached\n'; | |
| 87 } | |
| 88 var newindent = indent + '\t'; | |
| 89 var childindent = newindent + '\t' | |
| 90 var ret = indent + 'objectype {\n'; | |
| 91 for (var msgname in this.messages) { | |
| 92 ret += newindent + msgname + ':\n' + this.messages[msgname].str(childindent) | |
| 93 } | |
| 94 return ret + indent + '}\n'; | |
| 95 }; | |
| 96 | |
| 97 objecttype.prototype.replaceParams = function(paramtypes, visited) { | |
|
100
9db0e3533b23
Some work on parameterized types
Mike Pavone <pavone@retrodev.com>
parents:
99
diff
changeset
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98 if (visited === undefined) { |
| 99 | 99 visited = {}; |
| 100 } | |
| 101 if (this.id in visited) { | |
| 102 return visited[this.id]; | |
| 103 } | |
| 104 var me = visited[this.id] = this.clone(); | |
| 105 for (var msgname in this.messages) { | |
| 106 me.messages[msgname] = me.messages[msgname].replaceParams(paramtypes, visited); | |
| 107 } | |
| 108 return me; | |
| 109 }; | |
| 110 | |
| 111 objecttype.prototype.clone = function() { | |
| 112 var clone = new objecttype(); | |
| 113 for (var msgname in this.messages) { | |
| 114 clone.messages[msgname] = this.messages[msgname]; | |
| 115 } | |
| 116 clone.typeparams = this.typeparams; | |
| 117 return clone; | |
| 118 }; | |
| 119 | |
| 120 function lambdatype() | |
| 121 { | |
| 122 this.id = nexttypeid++; | |
| 123 this.messages = {}; | |
| 124 this.params = []; | |
| 125 this.paramlu = {}; | |
| 126 this.typeparams = []; | |
| 127 this.returntype = any; | |
| 128 this.satisfies_cache = {}; | |
| 129 this.satisfies_cache[this.id] = true; | |
| 130 } | |
| 131 | |
| 132 lambdatype.prototype.callable = true; | |
| 133 | |
| 134 lambdatype.prototype.addParam = function(name) { | |
| 135 this.paramlu[name] = this.params.length; | |
| 136 this.params.push(any); | |
| 137 }; | |
| 138 | |
| 139 lambdatype.prototype.paramType = function(name, type) { | |
| 140 this.params[this.paramlu[name]] = type; | |
| 141 }; | |
| 142 | |
| 143 lambdatype.prototype.addMessage = function(name, type) | |
| 144 { | |
| 145 this.messages[name] = type; | |
| 146 }; | |
| 147 | |
| 148 lambdatype.prototype.satisfiedBy = function(type) { | |
| 149 if (type.id in this.satisfies_cache) { | |
| 150 return this.satisfies_cache[type.id]; | |
| 151 } | |
| 152 if (type.lazyinit) { | |
| 153 type.lazyinit(); | |
| 154 } | |
| 155 //temporarily set cache entry to true to prevent infinite recursion | |
| 156 this.satisfies_cache[type.id] = true; | |
| 157 var ret = true; | |
| 158 if (!(type.callable) || this.params.length != type.params.length) { | |
| 159 ret = false; | |
| 160 } | |
| 161 if (ret) { | |
| 162 for (var i in this.params) { | |
| 163 if (i >= type.params.length || !this.params[i].satisfiedBy(type.params[i])) { | |
| 164 ret = false; | |
| 165 break; | |
| 166 } | |
| 167 } | |
| 168 } | |
| 169 if (ret) { | |
| 170 for (var msgname in this.messages) { | |
| 171 if (!(msgname in type.messages) || !this.messages[msgname].satisfiedBy(type.messages[msgname])) { | |
| 172 ret = false; | |
| 173 break; | |
| 174 } | |
| 175 } | |
| 176 } | |
| 177 ret = ret && this.returntype.satisfiedBy(type.returntype); | |
| 178 this.satisfies_cache[type.id] = ret; | |
| 179 return ret; | |
| 180 } | |
| 181 | |
| 182 lambdatype.prototype.str = function(indent) { | |
| 183 if (indent === undefined) { | |
| 184 indent = ''; | |
| 185 } | |
| 186 if (indent.length > 6) { | |
| 187 return 'max depth reached\n'; | |
| 188 } | |
| 189 var newindent = indent + '\t'; | |
| 190 var childindent = newindent + '\t' | |
| 191 var ret = indent + 'lambdatype {\n' + newindent + 'params: {\n'; | |
| 192 for (var i = 0; i < this.params.length; i++) { | |
| 193 ret += childindent + i + ':\n' + this.params[i].str(childindent + '\t'); | |
| 194 } | |
| 195 ret += newindent + '}\n' + newindent + 'returntype:\n' + this.returntype.str(childindent); | |
| 196 | |
| 197 for (var msgname in this.messages) { | |
| 198 ret += newindent + msgname + ':\n' + this.messages[msgname].str(childindent) | |
| 199 } | |
| 200 return ret + indent + '}\n'; | |
| 201 }; | |
| 202 | |
| 203 lambdatype.prototype.replaceParams = function(paramtypes, visited) { | |
|
100
9db0e3533b23
Some work on parameterized types
Mike Pavone <pavone@retrodev.com>
parents:
99
diff
changeset
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204 if (visited === undefined) { |
| 99 | 205 visited = {}; |
| 206 } | |
| 207 if (this.id in visited) { | |
| 208 return visited[this.id]; | |
| 209 } | |
| 210 var me = visited[this.id] = this.clone(); | |
|
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5d15b91e738a
Fix paramerized types. Remove debug print calls.
Mike Pavone <pavone@retrodev.com>
parents:
100
diff
changeset
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211 for (var msgname in me.messages) { |
| 99 | 212 me.messages[msgname] = me.messages[msgname].replaceParams(paramtypes, visited); |
| 213 } | |
|
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parents:
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214 for (var i in me.params) { |
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parents:
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215 me.params[i] = me.params[i].replaceParams(paramtypes, visited); |
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parents:
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216 } |
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parents:
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217 me.returntype = me.returntype.replaceParams(paramtypes, visited); |
| 99 | 218 return me; |
| 219 }; | |
| 220 | |
| 221 lambdatype.prototype.clone = function() { | |
| 222 var clone = new lambdatype(); | |
| 223 for (var msgname in this.messages) { | |
| 224 clone.messages[msgname] = this.messages[msgname]; | |
| 225 } | |
| 226 clone.paramlu = this.paramlu; | |
| 227 clone.params = this.params.slice(0, this.params.length); | |
| 228 clone.returntype = this.returntype; | |
| 229 clone.typeparams = this.typeparams; | |
| 230 return clone; | |
| 231 }; | |
| 232 | |
| 233 function uniontype(a, b) | |
| 234 { | |
| 235 this.a = a; | |
| 236 this.b = b; | |
| 237 this.id = nexttypeid++; | |
| 238 this.satisfies_cache = null; | |
| 239 } | |
| 240 | |
|
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241 uniontype.prototype = { |
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242 lazyinit: function() { |
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243 if (this.satisfies_cache == null) { |
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244 this.satisfies_cache = {}; |
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245 this.satisfies_cache[this.id] = true; |
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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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parents:
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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]); |
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parents:
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251 } |
| 99 | 252 } |
| 253 } | |
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254 this._callable = false; |
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255 if (this.a.callable && this.b.callable && this.a.params.length == this.b.params.length) { |
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256 this._callable = true; |
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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])); |
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260 } |
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261 this._returntype = mkunion(this.a.returntype, this.b.returntype); |
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262 } |
| 99 | 263 } |
|
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264 }, |
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parents:
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265 satisfiedBy: function(type) |
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parents:
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266 { |
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267 this.lazyinit(); |
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268 if (type.id in this.satisfies_cache) { |
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269 return this.satisfies_cache[type.id]; |
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270 } |
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parents:
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271 this.satisfies_cache[type.id] = true; |
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272 var ret = this.a.satisfiedBy(type) || this.b.satisfiedBy(type); |
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273 this.satisfies_cache[type.id] = ret; |
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274 return ret; |
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275 }, |
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276 str: function(indent) |
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277 { |
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278 if (indent === undefined) { |
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279 indent = ''; |
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280 } |
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281 if (indent.length > 6) { |
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282 return 'max depth reached\n'; |
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283 } |
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284 return indent + 'Union {\n\t' + indent + this.a.str(indent+'\t') + '\t' + indent + this.b.str(indent+'\t') + indent + '}\n'; |
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285 }, |
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286 replaceParams: function(paramtypes, visited) { |
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287 if (visited === undefined) { |
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288 visited = {}; |
| 99 | 289 } |
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290 if (this.id in visited) { |
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291 return visited[this.id]; |
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292 } |
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293 var me = visited[this.id] = this.clone(); |
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294 me.a = me.a.replaceParams(paramtypes, visited); |
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295 me.b = me.b.replaceParams(paramtypes, visited); |
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296 return me; |
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297 }, |
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298 clone: function() { |
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299 return new uniontype(this.a, this.b); |
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300 }, |
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301 get messages() { |
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302 this.lazyinit(); |
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303 return this._messages; |
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304 }, |
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305 get params() { |
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306 this.lazyinit(); |
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307 return this._params; |
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308 }, |
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309 get returntype() { |
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310 this.lazyinit(); |
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311 return this._returntype; |
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312 }, |
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313 get callable() { |
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314 this.lazyinit(); |
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315 return this._callable; |
| 99 | 316 } |
| 317 }; | |
| 318 | |
| 319 | |
| 320 function mkunion(a, b) | |
| 321 { | |
| 322 //if b is a subtype of a, then a | b is equivalent to a | |
| 323 if (a.satisfiedBy(b)) { | |
| 324 return a; | |
| 325 } | |
| 326 //if a is a subtype of b, then a | b is equivalent to b | |
| 327 if (b.satisfiedBy(a)) { | |
| 328 return b; | |
| 329 } | |
| 330 return new uniontype(a, b); | |
| 331 } | |
| 332 | |
| 333 function withtparams(type, params) | |
| 334 { | |
| 335 this.type = type; | |
| 336 this.params = params; | |
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337 this.replaced = false; |
| 99 | 338 } |
| 339 | |
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340 withtparams.prototype = { |
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341 satisfiedBy: function(type) { |
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342 this.lazyinit(); |
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343 return this.type.satisfiedBy(type); |
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344 }, |
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345 str: function(indent) { |
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346 if (indent === undefined) { |
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347 indent = ''; |
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348 } |
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349 if (indent.length > 6) { |
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350 return 'max depth reached\n'; |
| 99 | 351 } |
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352 return this.type.str(indent) + indent + '<' + this.params.map(function(p) { return p.str(indent); }).join(', ') + '>'; |
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353 }, |
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354 replaceParams: function(paramtypes) { |
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355 var replaced = false; |
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356 for (var i in this.params) { |
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357 var newp = this.params[i].replaceParams(paramtypes); |
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358 if (newp != this.params[i]) { |
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359 replaced = true; |
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360 this.params[i] = newp; |
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361 } |
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362 } |
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363 return this; |
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364 }, |
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365 lazyinit: function() { |
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366 if (!this.replaced) { |
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367 var childptypes = {}; |
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368 for (var i in this.type.typeparams) { |
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369 childptypes[this.type.typeparams[i]] = this.params[i] |
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370 } |
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371 this.type = this.type.replaceParams(childptypes, {}); |
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372 this.replaced = true; |
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373 } |
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374 }, |
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375 get messages() { |
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376 this.lazyinit(); |
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377 return this.type.messages; |
| 99 | 378 } |
| 379 }; | |
| 380 | |
| 381 function typetest() | |
| 382 { | |
| 383 var foo = new objecttype(); | |
| 384 var msgtype = new lambdatype(); | |
| 385 msgtype.addParam('fo'); | |
| 386 msgtype.returntype = foo; | |
| 387 foo.addMessage('bar', msgtype); | |
| 388 var baz = new objecttype(); | |
| 389 var msgtype2 = new lambdatype(); | |
| 390 msgtype2.addParam('fo'); | |
| 391 msgtype2.paramType('fo', foo); | |
| 392 msgtype2.returntype = baz; | |
| 393 baz.addMessage('bar', msgtype2); | |
| 394 baz.addMessage('qux', msgtype); | |
| 395 var shizzle = new objecttype(); | |
| 396 shizzle.addMessage('bar', msgtype); | |
| 397 shizzle.addMessage('boo', msgtype); | |
| 398 return {foo: foo, baz: baz, shizzle: shizzle}; | |
| 399 } | |
| 400 | |
| 401 function paramtypetest() | |
| 402 { | |
| 403 var empty = new objecttype(); | |
| 404 var tlnode = new objecttype(); | |
| 405 tlnode.typeparams = ['T']; | |
| 406 var t = new typeparam('T', any); | |
| 407 var q = new typeparam('Q', any); | |
| 408 var head = new lambdatype(); | |
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409 head.returntype = t; |
| 99 | 410 tlnode.addMessage('head', head); |
| 411 var tail = new lambdatype(); | |
| 412 var econs = new lambdatype(); | |
| 413 econs.addParam('val'); | |
| 414 econs.typeparams = ['Q']; | |
| 415 econs.paramType('val', q); | |
| 416 econs.returntype = new withtparams(tlnode, [q]); | |
| 417 empty.addMessage('cons', econs); | |
| 418 tail.returntype = new uniontype(new withtparams(tlnode, [t]), empty); | |
| 419 tlnode.addMessage('tail', tail); | |
| 420 var cons = new lambdatype(); | |
| 421 cons.addParam('val'); | |
| 422 cons.paramType('val', t); | |
| 423 cons.returntype = new withtparams(tlnode, [t]); | |
| 424 tlnode.addMessage('cons', cons); | |
| 425 return {empty: empty, tlnode: tlnode}; | |
| 426 } | |
| 427 |