Mercurial > repos > tabletprog
annotate types.js @ 115:a83989115028
Fix some variable scope issues in the JS backend.
author | Mike Pavone <pavone@retrodev.com> |
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date | Mon, 15 Apr 2013 21:13:09 -0700 |
parents | 182c311a9fed |
children | 09b65b364927 |
rev | line source |
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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 //temporarily set cache entry to true to prevent infinite recursion | |
61 this.satisfies_cache[type.id] = true; | |
62 var ret = true; | |
63 if (type.messages === undefined) { | |
64 ret = false; | |
65 } | |
66 if (ret) { | |
67 for (var msgname in this.messages) { | |
68 if (!(msgname in type.messages) || !this.messages[msgname].satisfiedBy(type.messages[msgname])) { | |
69 ret = false; | |
70 break; | |
71 } | |
72 } | |
73 } | |
74 this.satisfies_cache[type.id] = ret; | |
75 return ret; | |
76 }; | |
77 | |
78 objecttype.prototype.str = function(indent) { | |
79 if (indent === undefined) { | |
80 indent = ''; | |
81 } | |
82 if (indent.length > 6) { | |
83 return 'max depth reached\n'; | |
84 } | |
85 var newindent = indent + '\t'; | |
86 var childindent = newindent + '\t' | |
87 var ret = indent + 'objectype {\n'; | |
88 for (var msgname in this.messages) { | |
89 ret += newindent + msgname + ':\n' + this.messages[msgname].str(childindent) | |
90 } | |
91 return ret + indent + '}\n'; | |
92 }; | |
93 | |
94 objecttype.prototype.replaceParams = function(paramtypes, visited) { | |
100
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95 if (visited === undefined) { |
99 | 96 visited = {}; |
97 } | |
98 if (this.id in visited) { | |
99 return visited[this.id]; | |
100 } | |
101 var me = visited[this.id] = this.clone(); | |
102 for (var msgname in this.messages) { | |
103 me.messages[msgname] = me.messages[msgname].replaceParams(paramtypes, visited); | |
104 } | |
105 return me; | |
106 }; | |
107 | |
108 objecttype.prototype.clone = function() { | |
109 var clone = new objecttype(); | |
110 for (var msgname in this.messages) { | |
111 clone.messages[msgname] = this.messages[msgname]; | |
112 } | |
113 clone.typeparams = this.typeparams; | |
114 return clone; | |
115 }; | |
116 | |
117 function lambdatype() | |
118 { | |
119 this.id = nexttypeid++; | |
120 this.messages = {}; | |
121 this.params = []; | |
122 this.paramlu = {}; | |
123 this.typeparams = []; | |
124 this.returntype = any; | |
125 this.satisfies_cache = {}; | |
126 this.satisfies_cache[this.id] = true; | |
127 } | |
128 | |
129 lambdatype.prototype.callable = true; | |
130 | |
131 lambdatype.prototype.addParam = function(name) { | |
132 this.paramlu[name] = this.params.length; | |
133 this.params.push(any); | |
134 }; | |
135 | |
136 lambdatype.prototype.paramType = function(name, type) { | |
137 this.params[this.paramlu[name]] = type; | |
138 }; | |
139 | |
140 lambdatype.prototype.addMessage = function(name, type) | |
141 { | |
142 this.messages[name] = type; | |
143 }; | |
144 | |
145 lambdatype.prototype.satisfiedBy = function(type) { | |
146 if (type.id in this.satisfies_cache) { | |
147 return this.satisfies_cache[type.id]; | |
148 } | |
149 //temporarily set cache entry to true to prevent infinite recursion | |
150 this.satisfies_cache[type.id] = true; | |
151 var ret = true; | |
152 if (!(type.callable) || this.params.length != type.params.length) { | |
153 ret = false; | |
154 } | |
155 if (ret) { | |
156 for (var i in this.params) { | |
103
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157 if (i >= type.params.length || !type.params[i].satisfiedBy(this.params[i])) { |
99 | 158 ret = false; |
159 break; | |
160 } | |
161 } | |
162 } | |
163 if (ret) { | |
164 for (var msgname in this.messages) { | |
165 if (!(msgname in type.messages) || !this.messages[msgname].satisfiedBy(type.messages[msgname])) { | |
166 ret = false; | |
167 break; | |
168 } | |
169 } | |
170 } | |
171 ret = ret && this.returntype.satisfiedBy(type.returntype); | |
172 this.satisfies_cache[type.id] = ret; | |
173 return ret; | |
174 } | |
175 | |
176 lambdatype.prototype.str = function(indent) { | |
177 if (indent === undefined) { | |
178 indent = ''; | |
179 } | |
180 if (indent.length > 6) { | |
181 return 'max depth reached\n'; | |
182 } | |
183 var newindent = indent + '\t'; | |
184 var childindent = newindent + '\t' | |
185 var ret = indent + 'lambdatype {\n' + newindent + 'params: {\n'; | |
186 for (var i = 0; i < this.params.length; i++) { | |
187 ret += childindent + i + ':\n' + this.params[i].str(childindent + '\t'); | |
188 } | |
189 ret += newindent + '}\n' + newindent + 'returntype:\n' + this.returntype.str(childindent); | |
190 | |
191 for (var msgname in this.messages) { | |
192 ret += newindent + msgname + ':\n' + this.messages[msgname].str(childindent) | |
193 } | |
194 return ret + indent + '}\n'; | |
195 }; | |
196 | |
197 lambdatype.prototype.replaceParams = function(paramtypes, visited) { | |
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198 if (visited === undefined) { |
99 | 199 visited = {}; |
200 } | |
201 if (this.id in visited) { | |
202 return visited[this.id]; | |
203 } | |
204 var me = visited[this.id] = this.clone(); | |
101
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205 for (var msgname in me.messages) { |
99 | 206 me.messages[msgname] = me.messages[msgname].replaceParams(paramtypes, visited); |
207 } | |
101
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208 for (var i in me.params) { |
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209 me.params[i] = me.params[i].replaceParams(paramtypes, visited); |
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210 } |
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211 me.returntype = me.returntype.replaceParams(paramtypes, visited); |
99 | 212 return me; |
213 }; | |
214 | |
215 lambdatype.prototype.clone = function() { | |
216 var clone = new lambdatype(); | |
217 for (var msgname in this.messages) { | |
218 clone.messages[msgname] = this.messages[msgname]; | |
219 } | |
220 clone.paramlu = this.paramlu; | |
221 clone.params = this.params.slice(0, this.params.length); | |
222 clone.returntype = this.returntype; | |
223 clone.typeparams = this.typeparams; | |
224 return clone; | |
225 }; | |
226 | |
227 function uniontype(a, b) | |
228 { | |
229 this.a = a; | |
230 this.b = b; | |
231 this.id = nexttypeid++; | |
232 this.satisfies_cache = null; | |
233 } | |
234 | |
101
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235 uniontype.prototype = { |
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236 lazyinit: function() { |
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237 if (this.satisfies_cache == null) { |
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238 this.satisfies_cache = {}; |
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239 this.satisfies_cache[this.id] = true; |
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240 this._messages = {}; |
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241 if (this.a.messages !== undefined && this.b.messages !== undefined) { |
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242 for (var msgname in this.a.messages) { |
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243 if (msgname in this.b.messages) { |
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244 this._messages[msgname] = mkunion(this.a.messages[msgname], this.b.messages[msgname]); |
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245 } |
99 | 246 } |
247 } | |
101
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248 this._callable = false; |
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249 if (this.a.callable && this.b.callable && this.a.params.length == this.b.params.length) { |
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250 this._callable = true; |
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251 this._params = []; |
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252 for (var i = 0; i < this.a.params.length; i++) { |
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253 this._params.push(mkunion(this.a.params[i], this.b.params[i])); |
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254 } |
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255 this._returntype = mkunion(this.a.returntype, this.b.returntype); |
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256 } |
99 | 257 } |
101
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258 }, |
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259 satisfiedBy: function(type) |
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260 { |
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261 this.lazyinit(); |
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262 if (type.id in this.satisfies_cache) { |
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263 return this.satisfies_cache[type.id]; |
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264 } |
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265 this.satisfies_cache[type.id] = true; |
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266 var ret = this.a.satisfiedBy(type) || this.b.satisfiedBy(type); |
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267 this.satisfies_cache[type.id] = ret; |
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268 return ret; |
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269 }, |
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270 str: function(indent) |
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271 { |
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272 if (indent === undefined) { |
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273 indent = ''; |
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274 } |
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275 if (indent.length > 6) { |
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276 return 'max depth reached\n'; |
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277 } |
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278 return indent + 'Union {\n\t' + indent + this.a.str(indent+'\t') + '\t' + indent + this.b.str(indent+'\t') + indent + '}\n'; |
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279 }, |
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280 replaceParams: function(paramtypes, visited) { |
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281 if (visited === undefined) { |
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282 visited = {}; |
99 | 283 } |
101
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284 if (this.id in visited) { |
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285 return visited[this.id]; |
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286 } |
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287 var me = visited[this.id] = this.clone(); |
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288 me.a = me.a.replaceParams(paramtypes, visited); |
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289 me.b = me.b.replaceParams(paramtypes, visited); |
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290 return me; |
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291 }, |
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292 clone: function() { |
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293 return new uniontype(this.a, this.b); |
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294 }, |
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295 get messages() { |
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296 this.lazyinit(); |
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297 return this._messages; |
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298 }, |
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299 get params() { |
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300 this.lazyinit(); |
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301 return this._params; |
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302 }, |
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303 get returntype() { |
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304 this.lazyinit(); |
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305 return this._returntype; |
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306 }, |
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307 get callable() { |
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308 this.lazyinit(); |
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309 return this._callable; |
99 | 310 } |
311 }; | |
312 | |
313 | |
314 function mkunion(a, b) | |
315 { | |
316 //if b is a subtype of a, then a | b is equivalent to a | |
317 if (a.satisfiedBy(b)) { | |
318 return a; | |
319 } | |
320 //if a is a subtype of b, then a | b is equivalent to b | |
321 if (b.satisfiedBy(a)) { | |
322 return b; | |
323 } | |
324 return new uniontype(a, b); | |
325 } | |
326 | |
327 function withtparams(type, params) | |
328 { | |
329 this.type = type; | |
330 this.params = params; | |
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331 this.replaced = false; |
99 | 332 } |
333 | |
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334 withtparams.prototype = { |
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335 satisfiedBy: function(type) { |
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336 this.lazyinit(); |
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337 return this.type.satisfiedBy(type); |
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338 }, |
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339 str: function(indent) { |
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340 if (indent === undefined) { |
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341 indent = ''; |
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342 } |
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343 if (indent.length > 6) { |
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344 return 'max depth reached\n'; |
99 | 345 } |
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346 return this.type.str(indent) + indent + '<' + this.params.map(function(p) { return p.str(indent); }).join(', ') + '>'; |
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347 }, |
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348 replaceParams: function(paramtypes) { |
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349 var replaced = false; |
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350 for (var i in this.params) { |
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351 var newp = this.params[i].replaceParams(paramtypes); |
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352 if (newp != this.params[i]) { |
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353 replaced = true; |
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354 this.params[i] = newp; |
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355 } |
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356 } |
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357 return this; |
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358 }, |
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359 lazyinit: function() { |
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360 if (!this.replaced) { |
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361 var childptypes = {}; |
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362 for (var i in this.type.typeparams) { |
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363 childptypes[this.type.typeparams[i]] = this.params[i] |
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364 } |
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365 this.type = this.type.replaceParams(childptypes, {}); |
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366 this.replaced = true; |
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367 } |
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368 }, |
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369 get messages() { |
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370 this.lazyinit(); |
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371 return this.type.messages; |
99 | 372 } |
373 }; | |
374 | |
375 function typetest() | |
376 { | |
377 var foo = new objecttype(); | |
378 var msgtype = new lambdatype(); | |
379 msgtype.addParam('fo'); | |
380 msgtype.returntype = foo; | |
381 foo.addMessage('bar', msgtype); | |
382 var baz = new objecttype(); | |
383 var msgtype2 = new lambdatype(); | |
384 msgtype2.addParam('fo'); | |
385 msgtype2.paramType('fo', foo); | |
386 msgtype2.returntype = baz; | |
387 baz.addMessage('bar', msgtype2); | |
388 baz.addMessage('qux', msgtype); | |
389 var shizzle = new objecttype(); | |
390 shizzle.addMessage('bar', msgtype); | |
391 shizzle.addMessage('boo', msgtype); | |
392 return {foo: foo, baz: baz, shizzle: shizzle}; | |
393 } | |
394 | |
395 function paramtypetest() | |
396 { | |
397 var empty = new objecttype(); | |
398 var tlnode = new objecttype(); | |
399 tlnode.typeparams = ['T']; | |
400 var t = new typeparam('T', any); | |
401 var q = new typeparam('Q', any); | |
402 var head = new lambdatype(); | |
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403 head.returntype = t; |
99 | 404 tlnode.addMessage('head', head); |
405 var tail = new lambdatype(); | |
406 var econs = new lambdatype(); | |
407 econs.addParam('val'); | |
408 econs.typeparams = ['Q']; | |
409 econs.paramType('val', q); | |
410 econs.returntype = new withtparams(tlnode, [q]); | |
411 empty.addMessage('cons', econs); | |
412 tail.returntype = new uniontype(new withtparams(tlnode, [t]), empty); | |
413 tlnode.addMessage('tail', tail); | |
414 var cons = new lambdatype(); | |
415 cons.addParam('val'); | |
416 cons.paramType('val', t); | |
417 cons.returntype = new withtparams(tlnode, [t]); | |
418 tlnode.addMessage('cons', cons); | |
419 return {empty: empty, tlnode: tlnode}; | |
420 } | |
421 |