Replace.cpp

   1 /* Cycript - Optimizing JavaScript Compiler/Runtime
   2  * Copyright (C) 2009-2015  Jay Freeman (saurik)
   3 */
   4
   5 /* GNU Affero General Public License, Version 3 {{{ */
   6 /*
   7  * This program is free software: you can redistribute it and/or modify
   8  * it under the terms of the GNU Affero General Public License as published by
   9  * the Free Software Foundation, either version 3 of the License, or
  10  * (at your option) any later version.
  11
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU Affero General Public License for more details.
  16
  17  * You should have received a copy of the GNU Affero General Public License
  18  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19 **/
  20 /* }}} */
  21
  22 #include <iomanip>
  23
  24 #include "Replace.hpp"
  25 #include "Syntax.hpp"
  26
  27 CYFunctionExpression *CYNonLocalize(CYContext &context, CYFunctionExpression *function) {
  28     function->nonlocal_ = context.nextlocal_;
  29     return function;
  30 }
  31
  32 CYFunctionExpression *CYSuperize(CYContext &context, CYFunctionExpression *function) {
  33     function->super_ = context.super_;
  34     return function;
  35 }
  36
  37 CYStatement *CYDefineProperty(CYExpression *object, CYExpression *name, bool configurable, bool enumerable, CYProperty *descriptor) {
  38     return $E($C3($M($V("Object"), $S("defineProperty")), object, name, $ CYObject(CYList<CYProperty>()
  39         ->* (configurable ? $ CYPropertyValue($S("configurable"), $ CYTrue()) : NULL)
  40         ->* (enumerable ? $ CYPropertyValue($S("enumerable"), $ CYTrue()) : NULL)
  41         ->* descriptor)));
  42 }
  43
  44 static void CYImplicitReturn(CYStatement *&code) {
  45     if (CYStatement *&last = CYGetLast(code))
  46         last = last->Return();
  47 }
  48
  49 CYExpression *CYAdd::Replace(CYContext &context) {
  50     CYInfix::Replace(context);
  51
  52     CYString *lhs(dynamic_cast<CYString *>(lhs_));
  53     CYString *rhs(dynamic_cast<CYString *>(rhs_));
  54
  55     if (lhs != NULL || rhs != NULL) {
  56         if (lhs == NULL) {
  57             lhs = lhs_->String(context);
  58             if (lhs == NULL)
  59                 return this;
  60         } else if (rhs == NULL) {
  61             rhs = rhs_->String(context);
  62             if (rhs == NULL)
  63                 return this;
  64         }
  65
  66         return lhs->Concat(context, rhs);
  67     }
  68
  69     if (CYNumber *lhn = lhs_->Number(context))
  70         if (CYNumber *rhn = rhs_->Number(context))
  71             return $D(lhn->Value() + rhn->Value());
  72
  73     return this;
  74 }
  75
  76 CYExpression *CYAddressOf::Replace(CYContext &context) {
  77     return $C0($M(rhs_, $S("$cya")));
  78 }
  79
  80 CYArgument *CYArgument::Replace(CYContext &context) { $T(NULL)
  81     context.Replace(value_);
  82     next_ = next_->Replace(context);
  83
  84     if (value_ == NULL) {
  85         if (next_ == NULL)
  86             return NULL;
  87         else
  88             value_ = $U;
  89     }
  90
  91     return this;
  92 }
  93
  94 CYExpression *CYArray::Replace(CYContext &context) {
  95     if (elements_ != NULL)
  96         elements_->Replace(context);
  97     return this;
  98 }
  99
 100 CYExpression *CYArrayComprehension::Replace(CYContext &context) {
 101     CYVariable *cyv($V("$cyv"));
 102
 103     return $C0($F(NULL, $P1($L($I("$cyv")), comprehensions_->Parameters(context)), $$->*
 104         $E($ CYAssign(cyv, $ CYArray()))->*
 105         comprehensions_->Replace(context, $E($C1($M(cyv, $S("push")), expression_)))->*
 106         $ CYReturn(cyv)
 107     ));
 108 }
 109
 110 CYExpression *CYAssignment::Replace(CYContext &context) {
 111     context.Replace(lhs_);
 112     context.Replace(rhs_);
 113     return this;
 114 }
 115
 116 CYStatement *CYBlock::Return() {
 117     CYImplicitReturn(code_);
 118     return this;
 119 }
 120
 121 CYStatement *CYBlock::Replace(CYContext &context) {
 122     context.ReplaceAll(code_);
 123     if (code_ == NULL)
 124         return $ CYEmpty();
 125     return this;
 126 }
 127
 128 CYStatement *CYBreak::Replace(CYContext &context) {
 129     return this;
 130 }
 131
 132 CYExpression *CYCall::AddArgument(CYContext &context, CYExpression *value) {
 133     CYArgument **argument(&arguments_);
 134     while (*argument != NULL)
 135         argument = &(*argument)->next_;
 136     *argument = $ CYArgument(value);
 137     return this;
 138 }
 139
 140 CYExpression *CYCall::Replace(CYContext &context) {
 141     context.Replace(function_);
 142     arguments_->Replace(context);
 143     return this;
 144 }
 145
 146 namespace cy {
 147 namespace Syntax {
 148
 149 void Catch::Replace(CYContext &context) { $T()
 150     CYScope scope(true, context);
 151
 152     context.Replace(name_);
 153     context.scope_->Declare(context, name_, CYIdentifierCatch);
 154
 155     context.ReplaceAll(code_);
 156     scope.Close(context, code_);
 157 }
 158
 159 } }
 160
 161 CYExpression *CYClassExpression::Replace(CYContext &context) {
 162     CYBuilder builder;
 163
 164     CYIdentifier *super(context.Unique());
 165
 166     CYIdentifier *old(context.super_);
 167     context.super_ = super;
 168
 169     CYIdentifier *constructor(context.Unique());
 170     CYForEach (member, tail_->static_)
 171         member->Replace(context, builder, $V(constructor), true);
 172
 173     CYIdentifier *prototype(context.Unique());
 174     CYForEach (member, tail_->instance_)
 175         member->Replace(context, builder, $V(prototype), true);
 176
 177     if (tail_->constructor_ == NULL)
 178         tail_->constructor_ = $ CYFunctionExpression(NULL, NULL, NULL);
 179     tail_->constructor_ = CYSuperize(context, tail_->constructor_);
 180
 181     context.super_ = old;
 182
 183     return $C1($ CYFunctionExpression(NULL, $P($L(super)), $$
 184         ->* $ CYVar($L1($L(constructor, tail_->constructor_)))
 185         ->* $ CYVar($L1($L(prototype, $ CYFunctionExpression(NULL, NULL, NULL))))
 186         ->* $E($ CYAssign($M($V(prototype), $S("prototype")), $M($V(super), $S("prototype"))))
 187         ->* $E($ CYAssign($V(prototype), $N($V(prototype))))
 188         ->* CYDefineProperty($V(prototype), $S("constructor"), false, false, $ CYPropertyValue($S("value"), $V(constructor)))
 189         ->* $ CYVar(builder.declarations_)
 190         ->* builder.statements_
 191         ->* CYDefineProperty($V(constructor), $S("prototype"), false, false, $ CYPropertyValue($S("value"), $V(prototype)))
 192         ->* $ CYReturn($V(constructor))
 193     ), tail_->extends_ ?: $V($I("Object")));
 194 }
 195
 196 CYStatement *CYClassStatement::Replace(CYContext &context) {
 197     return $ CYVar($L1($L(name_, $ CYClassExpression(name_, tail_))));
 198 }
 199
 200 void CYClause::Replace(CYContext &context) { $T()
 201     context.Replace(case_);
 202     context.ReplaceAll(code_);
 203     next_->Replace(context);
 204 }
 205
 206 CYExpression *CYCompound::Replace(CYContext &context) {
 207     context.Replace(expression_);
 208     context.Replace(next_);
 209
 210     if (CYCompound *compound = dynamic_cast<CYCompound *>(expression_)) {
 211         expression_ = compound->expression_;
 212         compound->expression_ = compound->next_;
 213         compound->next_ = next_;
 214         next_ = compound;
 215     }
 216
 217     return this;
 218 }
 219
 220 CYFunctionParameter *CYCompound::Parameter() const {
 221     CYFunctionParameter *next(next_->Parameter());
 222     if (next == NULL)
 223         return NULL;
 224
 225     CYFunctionParameter *parameter(expression_->Parameter());
 226     if (parameter == NULL)
 227         return NULL;
 228
 229     parameter->SetNext(next);
 230     return parameter;
 231 }
 232
 233 CYFunctionParameter *CYComprehension::Parameters(CYContext &context) const { $T(NULL)
 234     CYFunctionParameter *next(next_->Parameters(context));
 235     if (CYFunctionParameter *parameter = Parameter(context)) {
 236         parameter->SetNext(next);
 237         return parameter;
 238     } else
 239         return next;
 240 }
 241
 242 CYStatement *CYComprehension::Replace(CYContext &context, CYStatement *statement) const {
 243     return next_ == NULL ? statement : next_->Replace(context, statement);
 244 }
 245
 246 CYExpression *CYComputed::PropertyName(CYContext &context) {
 247     return expression_;
 248 }
 249
 250 CYExpression *CYCondition::Replace(CYContext &context) {
 251     context.Replace(test_);
 252     context.Replace(true_);
 253     context.Replace(false_);
 254     return this;
 255 }
 256
 257 void CYContext::NonLocal(CYStatement *&statements) {
 258     CYContext &context(*this);
 259
 260     if (nextlocal_ != NULL && nextlocal_->identifier_ != NULL) {
 261         CYIdentifier *cye($I("$cye")->Replace(context));
 262         CYIdentifier *unique(nextlocal_->identifier_->Replace(context));
 263
 264         CYStatement *declare(
 265             $ CYVar($L1($L(unique, $ CYObject()))));
 266
 267         cy::Syntax::Catch *rescue(
 268             $ cy::Syntax::Catch(cye, $$->*
 269                 $ CYIf($ CYIdentical($M($V(cye), $S("$cyk")), $V(unique)), $$->*
 270                     $ CYReturn($M($V(cye), $S("$cyv"))))->*
 271                 $ cy::Syntax::Throw($V(cye))));
 272
 273         // XXX: I don't understand any of this
 274         context.Replace(declare);
 275         rescue->Replace(context);
 276
 277         statements = $$->*
 278             declare->*
 279             $ cy::Syntax::Try(statements, rescue, NULL);
 280     }
 281 }
 282
 283 CYIdentifier *CYContext::Unique() {
 284     return $ CYIdentifier($pool.strcat("$cy", $pool.itoa(unique_++), NULL));
 285 }
 286
 287 CYStatement *CYContinue::Replace(CYContext &context) {
 288     return this;
 289 }
 290
 291 CYStatement *CYDebugger::Replace(CYContext &context) {
 292     return this;
 293 }
 294
 295 CYAssignment *CYDeclaration::Assignment(CYContext &context) {
 296     if (initialiser_ == NULL)
 297         return NULL;
 298
 299     CYAssignment *value($ CYAssign(Variable(context), initialiser_));
 300     initialiser_ = NULL;
 301     return value;
 302 }
 303
 304 CYVariable *CYDeclaration::Variable(CYContext &context) {
 305     return $V(identifier_);
 306 }
 307
 308 CYStatement *CYDeclaration::ForEachIn(CYContext &context, CYExpression *value) {
 309     return $ CYVar($L1($ CYDeclaration(identifier_, value)));
 310 }
 311
 312 CYExpression *CYDeclaration::Replace(CYContext &context) {
 313     context.Replace(identifier_);
 314     context.scope_->Declare(context, identifier_, CYIdentifierVariable);
 315     return Variable(context);
 316 }
 317
 318 void CYDeclarations::Replace(CYContext &context) { $T()
 319     declaration_->Replace(context);
 320     next_->Replace(context);
 321 }
 322
 323 CYFunctionParameter *CYDeclarations::Parameter(CYContext &context) { $T(NULL)
 324     return $ CYFunctionParameter($ CYDeclaration(declaration_->identifier_), next_->Parameter(context));
 325 }
 326
 327 CYArgument *CYDeclarations::Argument(CYContext &context) { $T(NULL)
 328     return $ CYArgument(declaration_->initialiser_, next_->Argument(context));
 329 }
 330
 331 CYExpression *CYDeclarations::Expression(CYContext &context) { $T(NULL)
 332     CYExpression *compound(next_->Expression(context));
 333     if (CYAssignment *assignment = declaration_->Assignment(context))
 334         if (compound == NULL)
 335             compound = assignment;
 336         else
 337             compound = $ CYCompound(assignment, compound);
 338     return compound;
 339 }
 340
 341 CYExpression *CYDirectMember::Replace(CYContext &context) {
 342     context.Replace(object_);
 343     context.Replace(property_);
 344     return this;
 345 }
 346
 347 CYStatement *CYDoWhile::Replace(CYContext &context) {
 348     context.Replace(test_);
 349     context.ReplaceAll(code_);
 350     return this;
 351 }
 352
 353 void CYElementSpread::Replace(CYContext &context) {
 354     context.Replace(value_);
 355 }
 356
 357 void CYElementValue::Replace(CYContext &context) {
 358     context.Replace(value_);
 359     if (next_ != NULL)
 360         next_->Replace(context);
 361 }
 362
 363 CYStatement *CYEmpty::Replace(CYContext &context) {
 364     return NULL;
 365 }
 366
 367 CYExpression *CYEncodedType::Replace(CYContext &context) {
 368     return typed_->Replace(context);
 369 }
 370
 371 CYStatement *CYExpress::Return() {
 372     return $ CYReturn(expression_);
 373 }
 374
 375 CYStatement *CYExpress::Replace(CYContext &context) {
 376     context.Replace(expression_);
 377     return this;
 378 }
 379
 380 CYExpression *CYExpression::AddArgument(CYContext &context, CYExpression *value) {
 381     return $C1(this, value);
 382 }
 383
 384 CYStatement *CYExpression::ForEachIn(CYContext &context, CYExpression *value) {
 385     return $E($ CYAssign(this, value));
 386 }
 387
 388 CYAssignment *CYExpression::Assignment(CYContext &context) {
 389     return NULL;
 390 }
 391
 392 CYFunctionParameter *CYExpression::Parameter() const {
 393     return NULL;
 394 }
 395
 396 CYStatement *CYExternal::Replace(CYContext &context) {
 397     return $E($ CYAssign($V(typed_->identifier_), $C1(typed_->Replace(context), $C2($V("dlsym"), $V("RTLD_DEFAULT"), $S(typed_->identifier_->Word())))));
 398 }
 399
 400 CYNumber *CYFalse::Number(CYContext &context) {
 401     return $D(0);
 402 }
 403
 404 CYString *CYFalse::String(CYContext &context) {
 405     return $S("false");
 406 }
 407
 408 CYExpression *CYFatArrow::Replace(CYContext &context) {
 409     CYFunctionExpression *function($ CYFunctionExpression(NULL, parameters_, code_));
 410     function->this_.SetNext(context.this_);
 411     return function;
 412 }
 413
 414 void CYFinally::Replace(CYContext &context) { $T()
 415     context.ReplaceAll(code_);
 416 }
 417
 418 CYStatement *CYFor::Replace(CYContext &context) {
 419     context.Replace(initialiser_);
 420     context.Replace(test_);
 421     context.Replace(increment_);
 422     context.ReplaceAll(code_);
 423     return this;
 424 }
 425
 426 CYExpression *CYForDeclarations::Replace(CYContext &context) {
 427     declarations_->Replace(context);
 428     return declarations_->Expression(context);
 429 }
 430
 431 // XXX: this still feels highly suboptimal
 432 CYStatement *CYForIn::Replace(CYContext &context) {
 433     if (CYAssignment *assignment = initialiser_->Assignment(context))
 434         return $ CYBlock($$->*
 435             $E(assignment)->*
 436             this
 437         );
 438
 439     context.Replace(initialiser_);
 440     context.Replace(set_);
 441     context.ReplaceAll(code_);
 442     return this;
 443 }
 444
 445 CYFunctionParameter *CYForInComprehension::Parameter(CYContext &context) const {
 446     return $ CYFunctionParameter(declaration_);
 447 }
 448
 449 CYStatement *CYForInComprehension::Replace(CYContext &context, CYStatement *statement) const {
 450     return $ CYForIn(declaration_->Variable(context), set_, CYComprehension::Replace(context, statement));
 451 }
 452
 453 CYStatement *CYForOf::Replace(CYContext &context) {
 454     if (CYAssignment *assignment = initialiser_->Assignment(context))
 455         return $ CYBlock($$->*
 456             $E(assignment)->*
 457             this
 458         );
 459
 460     CYIdentifier *cys($I("$cys")), *cyt($I("$cyt"));
 461
 462     return $ CYLetStatement($L2($ CYDeclaration(cys, set_), $ CYDeclaration(cyt)), $$->*
 463         $ CYForIn($V(cyt), $V(cys), $ CYBlock($$->*
 464             initialiser_->ForEachIn(context, $M($V(cys), $V(cyt)))->*
 465             code_
 466         ))
 467     );
 468 }
 469
 470 CYFunctionParameter *CYForOfComprehension::Parameter(CYContext &context) const {
 471     return $ CYFunctionParameter(declaration_);
 472 }
 473
 474 CYStatement *CYForOfComprehension::Replace(CYContext &context, CYStatement *statement) const {
 475     CYIdentifier *cys($I("$cys"));
 476
 477     return $E($C0($F(NULL, $P1($L($I("$cys"))), $$->*
 478         $E($ CYAssign($V(cys), set_))->*
 479         $ CYForIn(declaration_->Variable(context), $V(cys), $ CYBlock($$->*
 480             $E($ CYAssign(declaration_->Variable(context), $M($V(cys), declaration_->Variable(context))))->*
 481             CYComprehension::Replace(context, statement)
 482         ))
 483     )));
 484 }
 485
 486 void CYFunction::Replace(CYContext &context) {
 487     CYThisScope *_this(context.this_);
 488     context.this_ = &this_;
 489     context.this_ = CYGetLast(context.this_);
 490
 491     CYIdentifier *super(context.super_);
 492     context.super_ = super_;
 493
 494     CYNonLocal *nonlocal(context.nonlocal_);
 495     CYNonLocal *nextlocal(context.nextlocal_);
 496
 497     bool localize;
 498     if (nonlocal_ != NULL) {
 499         localize = false;
 500         context.nonlocal_ = nonlocal_;
 501     } else {
 502         localize = true;
 503         nonlocal_ = $ CYNonLocal();
 504         context.nextlocal_ = nonlocal_;
 505     }
 506
 507     CYScope scope(!localize, context);
 508
 509     parameters_->Replace(context, code_);
 510
 511     context.ReplaceAll(code_);
 512
 513     if (implicit_)
 514         CYImplicitReturn(code_);
 515
 516     if (CYIdentifier *identifier = this_.identifier_) {
 517         context.scope_->Declare(context, identifier, CYIdentifierVariable);
 518         code_ = $$
 519             ->*$E($ CYAssign($V(identifier), $ CYThis()))
 520             ->*code_
 521         ;
 522     }
 523
 524     if (localize)
 525         context.NonLocal(code_);
 526
 527     context.nextlocal_ = nextlocal;
 528     context.nonlocal_ = nonlocal;
 529
 530     context.super_ = super;
 531     context.this_ = _this;
 532
 533     scope.Close(context, code_);
 534 }
 535
 536 CYExpression *CYFunctionExpression::Replace(CYContext &context) {
 537     CYScope scope(false, context);
 538     if (name_ != NULL)
 539         context.scope_->Declare(context, name_, CYIdentifierOther);
 540     CYFunction::Replace(context);
 541     scope.Close(context, code_);
 542     return this;
 543 }
 544
 545 void CYFunctionParameter::Replace(CYContext &context, CYStatement *&statements) { $T()
 546     CYAssignment *assignment(initialiser_->Assignment(context));
 547     context.Replace(initialiser_);
 548
 549     next_->Replace(context, statements);
 550
 551     if (assignment != NULL)
 552         statements = $$->*
 553             // XXX: this cast is quite incorrect
 554             $ CYIf($ CYIdentical($ CYTypeOf(dynamic_cast<CYExpression *>(initialiser_)), $S("undefined")), $$->*
 555                 $E(assignment)
 556             )->*
 557             statements;
 558 }
 559
 560 CYStatement *CYFunctionStatement::Replace(CYContext &context) {
 561     context.scope_->Declare(context, name_, CYIdentifierOther);
 562     CYFunction::Replace(context);
 563     return this;
 564 }
 565
 566 CYIdentifier *CYIdentifier::Replace(CYContext &context) {
 567     if (replace_ != NULL && replace_ != this)
 568         return replace_->Replace(context);
 569     replace_ = context.scope_->Lookup(context, this);
 570     return replace_;
 571 }
 572
 573 CYStatement *CYIf::Return() {
 574     CYImplicitReturn(true_);
 575     CYImplicitReturn(false_);
 576     return this;
 577 }
 578
 579 CYStatement *CYIf::Replace(CYContext &context) {
 580     context.Replace(test_);
 581     context.ReplaceAll(true_);
 582     context.ReplaceAll(false_);
 583     return this;
 584 }
 585
 586 CYFunctionParameter *CYIfComprehension::Parameter(CYContext &context) const {
 587     return NULL;
 588 }
 589
 590 CYStatement *CYIfComprehension::Replace(CYContext &context, CYStatement *statement) const {
 591     return $ CYIf(test_, CYComprehension::Replace(context, statement));
 592 }
 593
 594 CYStatement *CYImport::Replace(CYContext &context) {
 595     return $ CYVar($L1($L($I(module_->part_->Word()), $C1($V("require"), module_->Replace(context, "/")))));
 596 }
 597
 598 CYExpression *CYIndirect::Replace(CYContext &context) {
 599     return $M(rhs_, $S("$cyi"));
 600 }
 601
 602 CYExpression *CYIndirectMember::Replace(CYContext &context) {
 603     return $M($ CYIndirect(object_), property_);
 604 }
 605
 606 CYExpression *CYInfix::Replace(CYContext &context) {
 607     context.Replace(lhs_);
 608     context.Replace(rhs_);
 609     return this;
 610 }
 611
 612 CYStatement *CYLabel::Replace(CYContext &context) {
 613     context.Replace(statement_);
 614     return this;
 615 }
 616
 617 CYExpression *CYLambda::Replace(CYContext &context) {
 618     return $N2($V("Functor"), $ CYFunctionExpression(NULL, parameters_->Parameters(context), code_), parameters_->TypeSignature(context, typed_->Replace(context)));
 619 }
 620
 621 CYStatement *CYLetStatement::Replace(CYContext &context) {
 622     return $E($ CYCall(CYNonLocalize(context, $ CYFunctionExpression(NULL, declarations_->Parameter(context), code_)), declarations_->Argument(context)));
 623 }
 624
 625 CYFunctionExpression *CYMethod::Constructor() {
 626     return NULL;
 627 }
 628
 629 void CYMethod::Replace(CYContext &context) {
 630     CYFunction::Replace(context);
 631 }
 632
 633 CYString *CYModule::Replace(CYContext &context, const char *separator) const {
 634     if (next_ == NULL)
 635         return $ CYString(part_);
 636     return $ CYString($pool.strcat(next_->Replace(context, separator)->Value(), separator, part_->Word(), NULL));
 637 }
 638
 639 CYExpression *CYMultiply::Replace(CYContext &context) {
 640     CYInfix::Replace(context);
 641
 642     if (CYNumber *lhn = lhs_->Number(context))
 643         if (CYNumber *rhn = rhs_->Number(context))
 644             return $D(lhn->Value() * rhn->Value());
 645
 646     return this;
 647 }
 648
 649 namespace cy {
 650 namespace Syntax {
 651
 652 CYExpression *New::AddArgument(CYContext &context, CYExpression *value) {
 653     CYSetLast(arguments_) = $ CYArgument(value);
 654     return this;
 655 }
 656
 657 CYExpression *New::Replace(CYContext &context) {
 658     context.Replace(constructor_);
 659     arguments_->Replace(context);
 660     return this;
 661 }
 662
 663 } }
 664
 665 CYNumber *CYNull::Number(CYContext &context) {
 666     return $D(0);
 667 }
 668
 669 CYString *CYNull::String(CYContext &context) {
 670     return $S("null");
 671 }
 672
 673 CYNumber *CYNumber::Number(CYContext &context) {
 674     return this;
 675 }
 676
 677 CYString *CYNumber::String(CYContext &context) {
 678     // XXX: there is a precise algorithm for this
 679     return $S($pool.sprintf(24, "%.17g", Value()));
 680 }
 681
 682 CYExpression *CYNumber::PropertyName(CYContext &context) {
 683     return String(context);
 684 }
 685
 686 CYExpression *CYObject::Replace(CYContext &context) {
 687     CYBuilder builder;
 688     if (properties_ != NULL)
 689         properties_ = properties_->ReplaceAll(context, builder, $ CYThis(), false);
 690
 691     if (builder) {
 692         return $C1($M($ CYFunctionExpression(NULL, builder.declarations_->Parameter(context),
 693             builder.statements_->*
 694                 $ CYReturn($ CYThis())
 695         ), $S("call")), this, builder.declarations_->Argument(context));
 696     }
 697
 698     CYForEach (property, properties_)
 699         property->Replace(context);
 700     return this;
 701 }
 702
 703 CYExpression *CYParenthetical::Replace(CYContext &context) {
 704     return expression_;
 705 }
 706
 707 CYExpression *CYPostfix::Replace(CYContext &context) {
 708     context.Replace(lhs_);
 709     return this;
 710 }
 711
 712 CYExpression *CYPrefix::Replace(CYContext &context) {
 713     context.Replace(rhs_);
 714     return this;
 715 }
 716
 717 CYProperty *CYProperty::ReplaceAll(CYContext &context, CYBuilder &builder, CYExpression *self, bool update) {
 718     update |= name_->Computed();
 719     if (update)
 720         Replace(context, builder, self, false);
 721     if (next_ != NULL)
 722         next_ = next_->ReplaceAll(context, builder, self, update);
 723     return update ? next_ : this;
 724 }
 725
 726 void CYProperty::Replace(CYContext &context, CYBuilder &builder, CYExpression *self, bool protect) {
 727     CYExpression *name(name_->PropertyName(context));
 728     if (name_->Computed()) {
 729         CYIdentifier *unique(context.Unique());
 730         builder.declarations_->*$L1($L(unique, name));
 731         name = $V(unique);
 732     }
 733
 734     Replace(context, builder, self, name, protect);
 735 }
 736
 737 void CYPropertyGetter::Replace(CYContext &context, CYBuilder &builder, CYExpression *self, CYExpression *name, bool protect) {
 738     CYIdentifier *unique(context.Unique());
 739     builder.declarations_
 740         ->* $L1($L(unique, CYSuperize(context, $ CYFunctionExpression(NULL, parameters_, code_))));
 741     builder.statements_
 742         ->* CYDefineProperty(self, name, true, !protect, $ CYPropertyValue($S("get"), $V(unique)));
 743 }
 744
 745 CYFunctionExpression *CYPropertyMethod::Constructor() {
 746     return name_->Constructor() ? $ CYFunctionExpression(NULL, parameters_, code_) : NULL;
 747 }
 748
 749 void CYPropertyMethod::Replace(CYContext &context, CYBuilder &builder, CYExpression *self, CYExpression *name, bool protect) {
 750     CYIdentifier *unique(context.Unique());
 751     builder.declarations_
 752         ->* $L1($L(unique, CYSuperize(context, $ CYFunctionExpression(NULL, parameters_, code_))));
 753     builder.statements_
 754         ->* (!protect ? $E($ CYAssign($M(self, name), $V(unique))) :
 755             CYDefineProperty(self, name, true, !protect, $ CYPropertyValue($S("value"), $V(unique), $ CYPropertyValue($S("writable"), $ CYTrue()))));
 756 }
 757
 758 void CYPropertySetter::Replace(CYContext &context, CYBuilder &builder, CYExpression *self, CYExpression *name, bool protect) {
 759     CYIdentifier *unique(context.Unique());
 760     builder.declarations_
 761         ->* $L1($L(unique, CYSuperize(context, $ CYFunctionExpression(NULL, parameters_, code_))));
 762     builder.statements_
 763         ->* CYDefineProperty(self, name, true, !protect, $ CYPropertyValue($S("set"), $V(unique)));
 764 }
 765
 766 void CYPropertyValue::Replace(CYContext &context, CYBuilder &builder, CYExpression *self, CYExpression *name, bool protect) {
 767     _assert(!protect);
 768     CYIdentifier *unique(context.Unique());
 769     builder.declarations_
 770         ->* $L1($L(unique, value_));
 771     builder.statements_
 772         ->* $E($ CYAssign($M(self, name), $V(unique)));
 773 }
 774
 775 void CYPropertyValue::Replace(CYContext &context) {
 776     context.Replace(value_);
 777 }
 778
 779 // XXX: this is evil evil black magic. don't ask, don't tell... don't believe!
 780 #define MappingSet "0etnirsoalfucdphmgyvbxTwSNECAFjDLkMOIBPqzRH$_WXUVGYKQJZ"
 781 //#define MappingSet "0abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ$_"
 782
 783 namespace {
 784     struct IdentifierUsageLess :
 785         std::binary_function<CYIdentifier *, CYIdentifier *, bool>
 786     {
 787         _finline bool operator ()(CYIdentifier *lhs, CYIdentifier *rhs) const {
 788             if (lhs->usage_ != rhs->usage_)
 789                 return lhs->usage_ > rhs->usage_;
 790             return lhs < rhs;
 791         }
 792     };
 793
 794     typedef std::set<CYIdentifier *, IdentifierUsageLess> IdentifierUsages;
 795 }
 796
 797 void CYScript::Replace(CYContext &context) {
 798     CYScope scope(true, context);
 799
 800     context.nextlocal_ = $ CYNonLocal();
 801     context.ReplaceAll(code_);
 802     context.NonLocal(code_);
 803
 804     scope.Close(context, code_);
 805
 806     size_t offset(0);
 807
 808     CYCStringSet external;
 809     for (CYIdentifierValueSet::const_iterator i(scope.identifiers_.begin()); i != scope.identifiers_.end(); ++i)
 810         external.insert((*i)->Word());
 811
 812     IdentifierUsages usages;
 813
 814     if (offset < context.rename_.size())
 815         CYForEach (i, context.rename_[offset].identifier_)
 816             usages.insert(i);
 817
 818     // XXX: totalling the probable occurrences and sorting by them would improve the result
 819     for (CYIdentifierUsageVector::const_iterator i(context.rename_.begin()); i != context.rename_.end(); ++i, ++offset) {
 820         //std::cout << *i << ":" << (*i)->offset_ << std::endl;
 821
 822         const char *name;
 823
 824         if (context.options_.verbose_)
 825             name = $pool.strcat("$", $pool.itoa(offset), NULL);
 826         else {
 827             char id[8];
 828             id[7] = '\0';
 829
 830           id:
 831             unsigned position(7), local(offset + 1);
 832
 833             do {
 834                 unsigned index(local % (sizeof(MappingSet) - 1));
 835                 local /= sizeof(MappingSet) - 1;
 836                 id[--position] = MappingSet[index];
 837             } while (local != 0);
 838
 839             if (external.find(id + position) != external.end()) {
 840                 ++offset;
 841                 goto id;
 842             }
 843
 844             name = $pool.strmemdup(id + position, 7 - position);
 845             // XXX: at some point, this could become a keyword
 846         }
 847
 848         CYForEach (identifier, i->identifier_)
 849             identifier->Set(name);
 850     }
 851 }
 852
 853 CYStatement *CYReturn::Replace(CYContext &context) {
 854     if (context.nonlocal_ != NULL) {
 855         CYProperty *value(value_ == NULL ? NULL : $ CYPropertyValue($S("$cyv"), value_));
 856         return $ cy::Syntax::Throw($ CYObject(
 857             $ CYPropertyValue($S("$cyk"), $V(context.nonlocal_->Target(context)), value)
 858         ));
 859     }
 860
 861     context.Replace(value_);
 862     return this;
 863 }
 864
 865 CYExpression *CYRubyBlock::Replace(CYContext &context) {
 866     return call_->AddArgument(context, proc_->Replace(context));
 867 }
 868
 869 CYExpression *CYRubyBlock::AddArgument(CYContext &context, CYExpression *value) {
 870     return Replace(context)->AddArgument(context, value);
 871 }
 872
 873 CYExpression *CYRubyProc::Replace(CYContext &context) {
 874     CYFunctionExpression *function($ CYFunctionExpression(NULL, parameters_, code_));
 875     function = CYNonLocalize(context, function);
 876     function->implicit_ = true;
 877     return function;
 878 }
 879
 880 CYScope::CYScope(bool transparent, CYContext &context) :
 881     transparent_(transparent),
 882     parent_(context.scope_)
 883 {
 884     context.scope_ = this;
 885 }
 886
 887 void CYScope::Declare(CYContext &context, CYIdentifier *identifier, CYIdentifierFlags flags) {
 888     if (!transparent_ || flags == CYIdentifierArgument || flags == CYIdentifierCatch)
 889         internal_.insert(CYIdentifierAddressFlagsMap::value_type(identifier, flags));
 890     else if (parent_ != NULL)
 891         parent_->Declare(context, identifier, flags);
 892 }
 893
 894 CYIdentifier *CYScope::Lookup(CYContext &context, CYIdentifier *identifier) {
 895     std::pair<CYIdentifierValueSet::iterator, bool> insert(identifiers_.insert(identifier));
 896     return *insert.first;
 897 }
 898
 899 void CYScope::Merge(CYContext &context, CYIdentifier *identifier) {
 900     std::pair<CYIdentifierValueSet::iterator, bool> insert(identifiers_.insert(identifier));
 901     if (!insert.second) {
 902         if ((*insert.first)->offset_ < identifier->offset_)
 903             (*insert.first)->offset_ = identifier->offset_;
 904         identifier->replace_ = *insert.first;
 905         (*insert.first)->usage_ += identifier->usage_ + 1;
 906     }
 907 }
 908
 909 namespace {
 910     struct IdentifierOffset {
 911         size_t offset_;
 912         CYIdentifierFlags flags_;
 913         size_t usage_;
 914         CYIdentifier *identifier_;
 915
 916         IdentifierOffset(CYIdentifier *identifier, CYIdentifierFlags flags) :
 917             offset_(identifier->offset_),
 918             flags_(flags),
 919             usage_(identifier->usage_),
 920             identifier_(identifier)
 921         {
 922         }
 923     };
 924
 925     struct IdentifierOffsetLess :
 926         std::binary_function<const IdentifierOffset &, const IdentifierOffset &, bool>
 927     {
 928         _finline bool operator ()(const IdentifierOffset &lhs, const IdentifierOffset &rhs) const {
 929             if (lhs.offset_ != rhs.offset_)
 930                 return lhs.offset_ < rhs.offset_;
 931             if (lhs.flags_ != rhs.flags_)
 932                 return lhs.flags_ < rhs.flags_;
 933             /*if (lhs.usage_ != rhs.usage_)
 934                 return lhs.usage_ < rhs.usage_;*/
 935             return lhs.identifier_ < rhs.identifier_;
 936         }
 937     };
 938
 939     typedef std::set<IdentifierOffset, IdentifierOffsetLess> IdentifierOffsets;
 940 }
 941
 942 void CYScope::Close(CYContext &context, CYStatement *&statements) {
 943     context.scope_ = parent_;
 944
 945     if (parent_ == NULL)
 946         return;
 947
 948     CYDeclarations *last(NULL), *curr(NULL);
 949
 950     IdentifierOffsets offsets;
 951
 952     for (CYIdentifierAddressFlagsMap::const_iterator i(internal_.begin()); i != internal_.end(); ++i)
 953         if (i->second != CYIdentifierMagic)
 954             offsets.insert(IdentifierOffset(i->first, i->second));
 955
 956     size_t offset(0);
 957
 958     for (IdentifierOffsets::const_iterator i(offsets.begin()); i != offsets.end(); ++i) {
 959         if (i->flags_ == CYIdentifierVariable) {
 960             CYDeclarations *next($ CYDeclarations($ CYDeclaration(i->identifier_)));
 961             if (last == NULL)
 962                 last = next;
 963             if (curr != NULL)
 964                 curr->SetNext(next);
 965             curr = next;
 966         }
 967
 968         if (offset < i->offset_)
 969             offset = i->offset_;
 970         if (context.rename_.size() <= offset)
 971             context.rename_.resize(offset + 1);
 972
 973         CYIdentifierUsage &rename(context.rename_[offset++]);
 974         i->identifier_->SetNext(rename.identifier_);
 975         rename.identifier_ = i->identifier_;
 976         rename.usage_ += i->identifier_->usage_ + 1;
 977     }
 978
 979     if (last != NULL) {
 980         CYVar *var($ CYVar(last));
 981         var->SetNext(statements);
 982         statements = var;
 983     }
 984
 985     for (CYIdentifierValueSet::const_iterator i(identifiers_.begin()); i != identifiers_.end(); ++i)
 986         if (internal_.find(*i) == internal_.end()) {
 987             //std::cout << *i << '=' << offset << std::endl;
 988             if ((*i)->offset_ < offset)
 989                 (*i)->offset_ = offset;
 990             parent_->Merge(context, *i);
 991         }
 992 }
 993
 994 CYElementValue *CYSpan::Replace(CYContext &context) { $T(NULL)
 995     return $ CYElementValue(expression_, $ CYElementValue(string_, next_->Replace(context)));
 996 }
 997
 998 CYStatement *CYStatement::Return() {
 999     return this;
1000 }
1001
1002 CYString *CYString::Concat(CYContext &context, CYString *rhs) const {
1003     size_t size(size_ + rhs->size_);
1004     char *value($ char[size + 1]);
1005     memcpy(value, value_, size_);
1006     memcpy(value + size_, rhs->value_, rhs->size_);
1007     value[size] = '\0';
1008     return $S(value, size);
1009 }
1010
1011 CYNumber *CYString::Number(CYContext &context) {
1012     // XXX: there is a precise algorithm for this
1013     return NULL;
1014 }
1015
1016 CYExpression *CYString::PropertyName(CYContext &context) {
1017     return this;
1018 }
1019
1020 CYString *CYString::String(CYContext &context) {
1021     return this;
1022 }
1023
1024 CYExpression *CYSuperAccess::Replace(CYContext &context) {
1025     return $C1($M($M($M($V(context.super_), $S("prototype")), property_), $S("bind")), $ CYThis());
1026 }
1027
1028 CYExpression *CYSuperCall::Replace(CYContext &context) {
1029     return $C($C1($M($V(context.super_), $S("bind")), $ CYThis()), arguments_);
1030 }
1031
1032 CYStatement *CYSwitch::Replace(CYContext &context) {
1033     context.Replace(value_);
1034     clauses_->Replace(context);
1035     return this;
1036 }
1037
1038 CYExpression *CYTemplate::Replace(CYContext &context) {
1039     return $C2($M($M($M($V("String"), $S("prototype")), $S("concat")), $S("apply")), $S(""), $ CYArray($ CYElementValue(string_, spans_->Replace(context))));
1040 }
1041
1042 CYExpression *CYThis::Replace(CYContext &context) {
1043     if (context.this_ != NULL)
1044         return $V(context.this_->Identifier(context));
1045     return this;
1046 }
1047
1048 namespace cy {
1049 namespace Syntax {
1050
1051 CYStatement *Throw::Replace(CYContext &context) {
1052     context.Replace(value_);
1053     return this;
1054 }
1055
1056 } }
1057
1058 CYExpression *CYTrivial::Replace(CYContext &context) {
1059     return this;
1060 }
1061
1062 CYNumber *CYTrue::Number(CYContext &context) {
1063     return $D(1);
1064 }
1065
1066 CYString *CYTrue::String(CYContext &context) {
1067     return $S("true");
1068 }
1069
1070 namespace cy {
1071 namespace Syntax {
1072
1073 CYStatement *Try::Replace(CYContext &context) {
1074     context.ReplaceAll(code_);
1075     catch_->Replace(context);
1076     finally_->Replace(context);
1077     return this;
1078 }
1079
1080 } }
1081
1082 CYExpression *CYTypeArrayOf::Replace_(CYContext &context, CYExpression *type) {
1083     return next_->Replace(context, $ CYCall($ CYDirectMember(type, $ CYString("arrayOf")), $ CYArgument(size_)));
1084 }
1085
1086 CYExpression *CYTypeBlockWith::Replace_(CYContext &context, CYExpression *type) {
1087     return next_->Replace(context, $ CYCall($ CYDirectMember(type, $ CYString("blockWith")), parameters_->Argument(context)));
1088 }
1089
1090 CYExpression *CYTypeConstant::Replace_(CYContext &context, CYExpression *type) {
1091     return next_->Replace(context, $ CYCall($ CYDirectMember(type, $ CYString("constant"))));
1092 }
1093
1094 CYStatement *CYTypeDefinition::Replace(CYContext &context) {
1095     return $E($ CYAssign($V(typed_->identifier_), typed_->Replace(context)));
1096 }
1097
1098 CYExpression *CYTypeError::Replace(CYContext &context) {
1099     _assert(false);
1100     return NULL;
1101 }
1102
1103 CYExpression *CYTypeModifier::Replace(CYContext &context, CYExpression *type) { $T(type)
1104     return Replace_(context, type);
1105 }
1106
1107 CYExpression *CYTypeFunctionWith::Replace_(CYContext &context, CYExpression *type) {
1108     return next_->Replace(context, $ CYCall($ CYDirectMember(type, $ CYString("functionWith")), parameters_->Argument(context)));
1109 }
1110
1111 CYExpression *CYTypeLong::Replace(CYContext &context) {
1112     return $ CYCall($ CYDirectMember(specifier_->Replace(context), $ CYString("long")));
1113 }
1114
1115 CYExpression *CYTypePointerTo::Replace_(CYContext &context, CYExpression *type) {
1116     return next_->Replace(context, $ CYCall($ CYDirectMember(type, $ CYString("pointerTo"))));
1117 }
1118
1119 CYExpression *CYTypeShort::Replace(CYContext &context) {
1120     return $ CYCall($ CYDirectMember(specifier_->Replace(context), $ CYString("short")));
1121 }
1122
1123 CYExpression *CYTypeSigned::Replace(CYContext &context) {
1124     return $ CYCall($ CYDirectMember(specifier_->Replace(context), $ CYString("signed")));
1125 }
1126
1127 CYExpression *CYTypeUnsigned::Replace(CYContext &context) {
1128     return $ CYCall($ CYDirectMember(specifier_->Replace(context), $ CYString("unsigned")));
1129 }
1130
1131 CYExpression *CYTypeVariable::Replace(CYContext &context) {
1132     return $V(name_);
1133 }
1134
1135 CYExpression *CYTypeVoid::Replace(CYContext &context) {
1136     return $N1($V("Type"), $ CYString("v"));
1137 }
1138
1139 CYExpression *CYTypeVolatile::Replace_(CYContext &context, CYExpression *type) {
1140     return next_->Replace(context, $ CYCall($ CYDirectMember(type, $ CYString("volatile"))));
1141 }
1142
1143 CYExpression *CYTypedIdentifier::Replace(CYContext &context) {
1144     return modifier_->Replace(context, specifier_->Replace(context));
1145 }
1146
1147 CYTypeFunctionWith *CYTypedIdentifier::Function() {
1148     CYTypeModifier **modifier(&modifier_);
1149     if (*modifier == NULL)
1150         return NULL;
1151     while ((*modifier)->next_ != NULL)
1152         modifier = &(*modifier)->next_;
1153     CYTypeFunctionWith *function((*modifier)->Function());
1154     if (function == NULL)
1155         return NULL;
1156     *modifier = NULL;
1157     return function;
1158 }
1159
1160 CYArgument *CYTypedParameter::Argument(CYContext &context) { $T(NULL)
1161     return $ CYArgument(typed_->Replace(context), next_->Argument(context));
1162 }
1163
1164 CYFunctionParameter *CYTypedParameter::Parameters(CYContext &context) { $T(NULL)
1165     return $ CYFunctionParameter($ CYDeclaration(typed_->identifier_ ?: context.Unique()), next_->Parameters(context));
1166 }
1167
1168 CYExpression *CYTypedParameter::TypeSignature(CYContext &context, CYExpression *prefix) { $T(prefix)
1169     return next_->TypeSignature(context, $ CYAdd(prefix, typed_->Replace(context)));
1170 }
1171
1172 CYStatement *CYVar::Replace(CYContext &context) {
1173     declarations_->Replace(context);
1174     if (CYExpression *expression = declarations_->Expression(context))
1175         return $E(expression);
1176     return $ CYEmpty();
1177 }
1178
1179 CYExpression *CYVariable::Replace(CYContext &context) {
1180     context.Replace(name_);
1181     return this;
1182 }
1183
1184 CYFunctionParameter *CYVariable::Parameter() const {
1185     return $ CYFunctionParameter($ CYDeclaration(name_));
1186 }
1187
1188 CYStatement *CYWhile::Replace(CYContext &context) {
1189     context.Replace(test_);
1190     context.ReplaceAll(code_);
1191     return this;
1192 }
1193
1194 CYStatement *CYWith::Replace(CYContext &context) {
1195     context.Replace(scope_);
1196     context.ReplaceAll(code_);
1197     return this;
1198 }
1199
1200 CYExpression *CYWord::PropertyName(CYContext &context) {
1201     return $S(this);
1202 }