Mercurial > projects > qtd
annotate d2/qtd/meta/Compiletime.d @ 365:958e8b9a89bd
Changeset a084e2df3776 is broken. Backing out.
| author | Max Samukha <maxter@spambox.com> |
|---|---|
| date | Fri, 11 Jun 2010 20:09:25 +0300 |
| parents | a084e2df3776 |
| children | da4235301224 |
| rev | line source |
|---|---|
| 351 | 1 /************************************************************************** |
| 2 Copyright: QtD Team, 2010 | |
| 3 Authors: Max Samukha, Eldar Insafutdinov | |
| 4 License: Boost Software License 1.0 | |
| 5 **************************************************************************/ | |
| 6 module qtd.meta.Compiletime; | |
| 7 | |
| 8 import | |
|
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9 std.traits, |
| 351 | 10 std.conv, |
| 11 std.variant, | |
| 12 std.typetuple; | |
| 13 | |
| 14 import std.string : startsWith; | |
| 15 | |
|
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16 /** |
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17 */ |
| 351 | 18 enum standardNamespace = "qtd"; |
| 19 | |
| 20 template Alias(A...) if (A.length == 1) | |
| 21 { | |
| 22 static if (__traits(compiles, { alias A[0] x; })) | |
| 23 alias A[0] Alias; | |
| 24 else | |
| 25 enum Alias = A[0]; | |
| 26 } | |
| 27 | |
| 28 /** | |
| 29 Encapsulates a static tuple. Useful for preventing tuples from | |
| 30 flattening when they are passed to a variadic template. | |
| 31 */ | |
| 32 template TypeTupleWrapper(A...) | |
| 33 { | |
| 34 alias A tuple; | |
| 35 } | |
| 36 | |
| 37 | |
| 38 /** | |
| 39 Returns a tuple with T repeated count times. | |
| 40 */ | |
| 41 // TODO: generalize to accept any symbol | |
| 42 template Repeat(T, size_t count) | |
| 43 { | |
| 44 static if (count) | |
| 45 alias TypeTuple!(count, Repeat!(T, count - 1)) Repeat; | |
| 46 else | |
| 47 alias TypeTuple!() Repeat; | |
| 48 } | |
| 49 | |
| 50 /** | |
| 51 Returns the required number of function arguments, optional arguments excluded | |
| 52 */ | |
| 53 int requiredArgCount(alias fn)() { | |
| 54 alias ParameterTypeTuple!(typeof(&fn)) P; | |
| 55 P p; | |
| 56 static if (P.length == 0) | |
| 57 return 0; | |
| 58 | |
| 59 foreach(i, _; P) | |
| 60 { | |
| 61 static if (!__traits(compiles, fn(p[0..$-i-1]))) | |
| 62 { | |
| 63 return p.length - i; | |
| 64 } | |
| 65 } | |
| 66 return 0; | |
| 67 } | |
| 68 | |
| 69 /** | |
| 70 Returns true if is a delegate type. | |
| 71 */ | |
| 72 template isDelegate(T) | |
| 73 { | |
| 74 enum isDelegate = is(T == delegate); | |
| 75 } | |
| 76 | |
| 77 /** | |
| 78 Returns true if T is a function pointer type. | |
| 79 */ | |
| 80 template isFunctionPointer(T) | |
| 81 { | |
| 82 enum isFuntionPointer = is(typeof(*T.init) == function); | |
| 83 } | |
| 84 | |
| 85 /** | |
| 86 Returns true if entity is a function or function type. | |
| 87 */ | |
| 88 template isFunction(alias entity) | |
| 89 { | |
| 90 static if (is(entity)) | |
| 91 alias isFunction!(entity, void) isFunction; | |
| 92 else | |
| 93 enum isFunction = is(typeof(entity) == function); | |
| 94 } | |
| 95 | |
| 96 template isFunction(T, Dummy = void) | |
| 97 { | |
| 98 enum isFunction = is(T == function); | |
| 99 } | |
| 100 | |
| 101 | |
| 102 //TODO: hack | |
| 103 uint isModule(string str) | |
| 104 { | |
| 105 return startsWith(str, "module "); | |
| 106 } | |
| 107 | |
| 108 | |
| 109 template qualifiedCppName(T) | |
| 110 { | |
| 111 static if(!isModule(__traits(parent, T).stringof)) | |
| 112 enum qualifiedCppName = qualifiedCppName!(__traits(parent, T)) ~ "::" ~ T.stringof; | |
| 113 else | |
| 114 enum qualifiedCppName = T.stringof; | |
| 115 } | |
| 116 | |
| 117 template qualifiedName(T) | |
| 118 { | |
| 119 static if (!isModule(__traits(parent, T).stringof)) | |
| 120 enum qualifiedName = qualifiedName!(__traits(parent, T)) ~ "." ~ T.stringof; | |
| 121 else | |
| 122 enum qualifiedName = T.stringof; | |
| 123 } | |
| 124 | |
| 125 template fullName(T) | |
| 126 { | |
| 127 static if (is(T == enum)) | |
| 128 enum fullName = qualifiedName!T; | |
| 129 else | |
| 130 enum fullName = T.stringof; | |
| 131 } | |
| 132 | |
| 133 /** | |
| 134 */ | |
| 135 enum AttributeOptions | |
| 136 { | |
| 137 /** | |
| 138 */ | |
| 139 none, | |
| 140 | |
| 141 /** | |
| 142 Allows multiple equally named attributes to be associated with the symbol. | |
| 143 */ | |
| 144 allowMultiple = 0x0000_0001, | |
| 145 | |
| 146 /* internal */ inner = 0x0000_0002, | |
| 147 } | |
| 148 | |
| 149 /** | |
| 150 When mixed in an aggregate, converts a compile-time tuple to | |
| 151 members of that aggregate. | |
| 152 */ | |
| 153 mixin template tupleToMembers(string nameSpace, size_t index, A...) | |
| 154 { | |
| 155 static if (index < A.length) | |
| 156 { | |
| 157 enum indexStr = to!string(index); | |
| 158 | |
| 159 static if (is(typeof( { typeof(A[index]) x; }() ))) | |
| 160 mixin("typeof(A[" ~ indexStr ~ "]) " ~ nameSpace ~ indexStr ~ " = A[" ~ indexStr ~"];\n"); | |
| 161 else | |
| 162 mixin("alias Alias!(A[" ~ indexStr ~ "]) " ~ nameSpace ~ indexStr ~ ";\n"); | |
| 163 | |
| 164 mixin tupleToMembers!(nameSpace, index + 1, A); | |
| 165 } | |
| 166 } | |
| 167 | |
| 168 /** | |
| 169 When mixed in an aggregate, converts a compile-time tuple of name-value pairs to | |
| 170 members of that aggregate. | |
| 171 */ | |
| 172 mixin template NameValueTupleToFields(A...) | |
| 173 { | |
| 174 | |
| 175 } | |
| 176 | |
| 177 version (QtdUnittest) | |
| 178 { | |
| 179 unittest | |
| 180 { | |
| 181 static int foo() | |
| 182 { | |
| 183 return 42; | |
| 184 } | |
| 185 | |
| 186 static struct S | |
| 187 { | |
| 188 mixin tupleToMembers!("member", 0, | |
| 189 int, | |
| 190 "a", | |
| 191 22, | |
| 192 foo); | |
| 193 } | |
| 194 | |
| 195 static assert(is(S.member0 == int)); | |
| 196 S s; | |
| 197 assert(s.member1 == "a"); | |
| 198 assert(s.member2 == 22); | |
| 199 assert(S.member3() == 42); | |
| 200 } | |
| 201 } | |
| 202 | |
| 203 private template attributeId(alias symbol, uint index = 0) | |
| 204 { | |
| 205 enum attributeId = standardNamespace ~ "_attr_" ~ uniqueId!symbol ~ "_" ~ to!string(index); | |
| 206 } | |
| 207 | |
| 208 /** | |
| 209 Attributes allow to associate arbitrary compile-time data | |
| 210 with a declaration and optionaly make that data available at run-time. | |
| 211 | |
| 212 ---- | |
| 213 class A | |
| 214 { | |
| 215 } | |
| 216 mixin Attribute!(C, "someAttribute", "B"); | |
| 217 ---- | |
| 218 | |
| 219 The example above associates the string "B" with class A under the attribute name "someAttribute". | |
| 220 Multiple attributes with the same name can be associated with a single declaration. | |
| 221 | |
| 222 ---- | |
| 223 class A | |
| 224 { | |
| 225 } | |
| 226 mixin Attribute!(C, "someAttribute", "B"); | |
| 227 mixin Attribute!(C, "someAttribute", AttributeOptions.allowMultiple, "C"); | |
| 228 ---- | |
| 229 | |
| 230 Attributes can be accessed at compile-time as follows: | |
| 231 | |
| 232 ---- | |
| 233 alias GetAttributes!(C, "someAttribute") attrs; | |
| 234 ---- | |
| 235 | |
| 236 GetAttribute returns a static tuple, which contains "someAttribute" attributes in the form | |
| 237 of TypeTupleWrapper instances. The wrapped tuples have the following layout: | |
| 238 | |
| 239 [0] - attribute name | |
| 240 [1] - attribute options | |
| 241 [2..$] - attribute data | |
| 242 | |
| 243 ---- | |
| 244 alias attrs[0] attr0; | |
| 245 alias attrs[1] attr1; | |
| 246 | |
| 247 static assert(attrs0.tuple[0] == "someAttribute" && attrs0.tuple[2] == "B"); | |
| 248 static assert(attrs1.tuple[0] == "someAttribute" && attrs1.tuple[2] == "C"); | |
| 249 ---- | |
| 250 | |
| 251 Attributes can be inserted inside the body of a declaration. | |
| 252 ---- | |
| 253 class A | |
| 254 { | |
| 255 mixin Attribute!("someAttribute", "B"); | |
| 256 } | |
| 257 ---- | |
| 258 | |
| 259 Attributes can be made available at run time by means of the declaration's meta-object | |
| 260 ---- | |
| 261 // prints names of all attributes associated with class A | |
| 262 auto a = new A; | |
| 263 foreach (attr; a.metaObject.attributes) | |
| 264 writeln(attr.name); | |
| 265 ---- | |
| 266 | |
| 267 Attributes can be specialized | |
| 268 | |
| 269 ---- | |
| 270 mixin template DbFieldAttribute(alias prop, string columnName) | |
| 271 { | |
| 272 mixin Attribute!(prop, "DbFieldAttribute", columnName); | |
| 273 } | |
| 274 | |
| 275 class A | |
| 276 { | |
| 277 int value; | |
| 278 mixin DbFieldAttribute!(value, "Value"); | |
| 279 | |
| 280 int anotherValue; | |
| 281 mixin DbFieldAttribute!(anotherValue, "Value2"); | |
| 282 } | |
| 283 | |
| 284 assert(GetAttributes!(A.value, "DbFieldAttribute")[0].tuple[1] == "Value"); | |
| 285 assert(GetAttributes!(A.anotherValue, "DbFieldAttribute")[0].tuple[1] == "Value2"); | |
| 286 ---- | |
| 287 | |
| 288 */ | |
| 289 mixin template Attribute(alias symbol, string attrClass, A...) | |
| 290 { | |
| 291 mixin Attribute!(symbol, attrClass, AttributeOptions.none, A); | |
| 292 } | |
| 293 | |
| 294 /// ditto | |
| 295 mixin template Attribute(alias symbol, string attrClass, AttributeOptions opts, A...) | |
| 296 { | |
| 297 mixin AttributeImpl!(symbol, attrClass, opts, 0, A); | |
| 298 } | |
| 299 | |
| 300 | |
| 301 /// ditto | |
| 302 // TODO: probably make this an overload of Attribute | |
| 303 mixin template InnerAttribute(string attrClass, AttributeOptions opts, A...) | |
| 304 { | |
| 305 // BUG: needs to be generalized to accept any parent | |
| 306 mixin Attribute!(typeof(this), attrClass, opts | AttributeOptions.inner, A); | |
| 307 } | |
| 308 | |
| 309 /// ditto | |
| 310 mixin template InnerAttribute(string attrClass, A...) | |
| 311 { | |
| 312 mixin InnerAttribute!(attrClass, AttributeOptions.none, A); | |
| 313 } | |
| 314 | |
| 315 private mixin template AttributeImpl(alias symbol, string attrClass, AttributeOptions opts, size_t index, A...) | |
| 316 { | |
| 317 private enum attrId = attributeId!(symbol, index) ~ (opts & AttributeOptions.inner ? "_inner" : ""); | |
| 318 | |
| 319 static if (is(typeof(mixin(attrId)))) | |
| 320 { | |
| 321 mixin ("alias " ~ attrId ~ " attr;"); | |
| 322 static if (!(opts & AttributeOptions.allowMultiple)) | |
| 323 { | |
| 324 static assert (attr[0] != attrClass, "Multiple " ~ attrClass ~ " attributes are not allowed for " | |
| 325 ~ __traits(parent, symbol).stringof ~ "." ~ stringOf!symbol); | |
| 326 } | |
| 327 | |
| 328 mixin AttributeImpl!(symbol, attrClass, opts, index + 1, A); | |
| 329 } | |
| 330 else | |
| 331 { | |
| 332 mixin ("alias TypeTuple!(attrClass, opts, A) " ~ attrId ~ ";"); | |
| 333 } | |
| 334 } | |
| 335 | |
| 336 private string stringOfFunction(alias symbol)() | |
| 337 { | |
| 338 auto ptrType = typeof(&symbol).stringof; | |
| 339 auto paramList = ParameterTypeTuple!(symbol).stringof; | |
| 340 | |
| 341 string result = ReturnType!(symbol).stringof ~ " " ~ __traits(identifier, symbol) ~ paramList; | |
| 342 | |
| 343 if (ptrType[$ - 1] != ')') | |
| 344 { | |
| 345 for (size_t i = ptrType.length - 2;; --i) | |
| 346 { | |
| 347 if (ptrType[i] == ')') | |
| 348 { | |
| 349 result ~= ptrType[i + 1..$]; | |
| 350 break; | |
| 351 } | |
| 352 } | |
| 353 } | |
| 354 | |
| 355 return result; | |
| 356 } | |
| 357 | |
| 358 /** | |
| 359 String of any symbol, including functions | |
| 360 */ | |
| 361 template stringOf(alias symbol) | |
| 362 { | |
| 363 static if (isFunction!symbol) | |
| 364 enum stringOf = stringOfFunction!symbol; | |
| 365 else | |
| 366 enum stringOf = symbol.stringof; | |
| 367 } | |
| 368 | |
| 369 /** | |
| 370 Returns the string uniquely identifying the | |
| 371 symbol in its container. | |
| 372 */ | |
| 373 template uniqueName(alias symbol) | |
| 374 { | |
| 375 enum uniqueName = stringOf!symbol; | |
| 376 } | |
| 377 | |
| 378 // TODO: works only for simple types. implement | |
| 379 string uniqueIdImpl(string symbol) | |
| 380 { | |
| 381 char[] r = symbol.dup; | |
| 382 foreach (i, c; symbol) | |
| 383 { | |
| 384 if (c == '(' || c == ')' || c == ' ') | |
| 385 r[i] = '_'; | |
| 386 } | |
| 387 | |
| 388 return cast(immutable)r; | |
| 389 } | |
| 390 | |
| 391 /** | |
| 392 Returns a valid D identifier uniquely | |
| 393 identifying symbol in its container. | |
| 394 */ | |
| 395 template uniqueId(alias symbol) | |
| 396 { | |
| 397 enum uniqueId = uniqueIdImpl(stringOf!symbol); | |
| 398 } | |
| 399 | |
| 400 version (QtdUnittest) | |
| 401 { | |
| 402 unittest | |
| 403 { | |
| 404 static class C | |
| 405 { | |
| 406 void foo() const {}; | |
| 407 bool bar(int) { return true; }; | |
| 408 int x; | |
| 409 static assert (stringOf!foo == "void foo() const"); | |
| 410 static assert (uniqueName!foo == "void foo() const"); | |
| 411 static assert (stringOf!bar == "bool bar(int)"); | |
| 412 static assert (uniqueName!bar == "bool bar(int)"); | |
| 413 static assert (stringOf!x == "x"); | |
| 414 static assert (uniqueName!x == "x"); | |
| 415 } | |
| 416 | |
| 417 static assert (stringOf!(C.foo) == "void foo() const"); | |
| 418 static assert (uniqueName!(C.foo) == "void foo() const"); | |
| 419 static assert (stringOf!(C.bar) == "bool bar(int)"); | |
| 420 static assert (uniqueName!(C.bar) == "bool bar(int)"); | |
| 421 | |
| 422 static assert (stringOf!(C.x) == "x"); | |
| 423 static assert (uniqueName!(C.x) == "x"); | |
| 424 } | |
| 425 } | |
| 426 | |
| 427 /** | |
| 428 Predicate that always evaluates to true regardless of arguments. | |
| 429 */ | |
| 430 template truePred(A...) | |
| 431 { | |
| 432 enum truePred = true; | |
| 433 } | |
| 434 | |
| 435 private template attrNamePred(string name) | |
| 436 { | |
| 437 template attrNamePred(A...) | |
| 438 { | |
| 439 enum attrNamePred = A[0] == name; | |
| 440 } | |
| 441 } | |
| 442 | |
| 443 /** | |
| 444 Returns a compile-time tuple of attributes that | |
| 445 match pred. | |
| 446 */ | |
| 447 template GetAttributes(alias symbol, alias pred = truePred) | |
| 448 { | |
| 449 alias GetAttributesImpl!(symbol, 0, pred).result GetAttributes; | |
| 450 } | |
| 451 | |
| 452 /** | |
| 453 Returns a compile-time tuple of attributes | |
| 454 matching the specified attribute name. | |
| 455 */ | |
| 456 template GetAttributes(alias symbol, string attrName) | |
| 457 { | |
| 458 alias GetAttributes!(symbol, attrNamePred!attrName) GetAttributes; | |
| 459 } | |
| 460 | |
| 461 | |
| 462 template GetAttributesImpl(alias symbol, size_t index, alias pred) | |
| 463 { | |
| 464 //pragma(msg, mixin("symbol." ~ attributeId!(symbol, index) ~ "_inner").stringof); | |
| 465 static if (is(typeof(mixin("__traits(parent, symbol)." ~ attributeId!(symbol, index))))) | |
| 466 mixin ("alias Alias!(__traits(parent, symbol))." ~ attributeId!(symbol, index) ~ " attr;"); | |
| 467 else static if (is(typeof(mixin("symbol." ~ attributeId!(symbol, index) ~ "_inner")))) | |
| 468 mixin ("alias symbol." ~ attributeId!(symbol, index) ~ "_inner attr;"); | |
| 469 | |
| 470 static if (is(typeof(attr))) | |
| 471 { | |
| 472 alias GetAttributesImpl!(symbol, index + 1, pred).result next; | |
| 473 | |
| 474 static if (pred!attr) | |
| 475 alias TypeTuple!(TypeTupleWrapper!attr, next) result; | |
| 476 else | |
| 477 alias next result; | |
| 478 } | |
| 479 else | |
| 480 alias TypeTuple!() result; | |
| 481 } | |
| 482 | |
| 483 version (QtdUnittest) | |
| 484 { | |
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485 mixin template QtdCustomAttribute(alias symbol, A...) |
| 351 | 486 { |
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487 mixin Attribute!(symbol, "QtdCustomAttribute", AttributeOptions.allowMultiple, A); |
| 351 | 488 } |
| 489 | |
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490 mixin template QtdCustomInnerAttribute(string name, alias value) |
| 351 | 491 { |
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492 mixin InnerAttribute!("QtdCustomInnerAttribute", AttributeOptions.allowMultiple, name, value); |
| 351 | 493 } |
| 494 | |
| 495 unittest | |
| 496 { | |
| 497 static class C | |
| 498 { | |
| 499 // inner C attributes | |
| 500 mixin InnerAttribute!("Inner", 33); // generic | |
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501 mixin QtdCustomInnerAttribute!("version", 123); |
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502 mixin QtdCustomInnerAttribute!("author", "James Bond"); |
| 351 | 503 |
| 504 | |
| 505 void foo() {}; | |
| 506 // foo attributes | |
| 507 mixin Attribute!(foo, "SomeAttribute", 42); | |
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508 mixin QtdCustomAttribute!(foo, 1, 2); |
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509 mixin QtdCustomAttribute!(foo, 3, 4); |
| 351 | 510 |
| 511 alias GetAttributes!(typeof(this), "Inner") innerAttrs; | |
| 512 static assert(innerAttrs[0].tuple[0] == "Inner"); | |
| 513 } | |
| 514 // outer C attribute | |
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515 mixin QtdCustomAttribute!(C, 24); |
| 351 | 516 |
| 517 alias GetAttributes!(C, "Inner") innerAttrs; | |
| 518 static assert(innerAttrs[0].tuple[0] == "Inner" && innerAttrs[0].tuple[2] == 33); | |
| 519 | |
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520 alias GetAttributes!(C, "QtdCustomInnerAttribute") ciAttrs; |
| 351 | 521 static assert(ciAttrs[0].tuple[2] == "version" && ciAttrs[0].tuple[3] == 123); |
| 522 | |
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523 /+ Fails on Windows but passes on Linux |
| 351 | 524 alias GetAttributes!(C.foo, "SomeAttribute") someAttr; |
| 525 static assert(someAttr.length == 1); | |
| 526 static assert(someAttr[0].tuple[0] == "SomeAttribute"); | |
| 527 | |
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528 alias GetAttributes!(C.foo, "QtdCustomAttribute") myAttrs; |
| 351 | 529 |
| 530 //COMPILER BUG: cannot 'alias myAttrs[0].tuple myAttrs_0'; | |
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531 |
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532 static assert(myAttrs[0].tuple[0] == "QtdCustomAttribute"); |
| 351 | 533 static assert(myAttrs[0].tuple[2] == 1 && myAttrs[0].tuple[3] == 2); |
| 534 | |
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535 static assert(myAttrs[1].tuple[0] == "QtdCustomAttribute"); |
| 351 | 536 static assert(myAttrs[1].tuple[2] == 3 && myAttrs[1].tuple[3] == 4); |
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537 +/ |
| 351 | 538 |
| 539 /+ BUG: Fails: local declarations cannot be accessed as parent.localDecl | |
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540 alias GetAttributes!(C, "QtdCustomAttribute") myAttrs2; |
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541 static assert(myAttrs2[0].tuple[0] == "QtdCustomAttribute"); |
| 351 | 542 static assert(myAttrs2[0].tuple[1] == 24); |
| 543 +/ | |
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544 |
| 351 | 545 } |
| 546 } |