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 #include <map>
  24
  25 #include "Replace.hpp"
  26 #include "Syntax.hpp"
  27
  28 CYFunctionExpression *CYNonLocalize(CYContext &context, CYFunctionExpression *function) {
  29     function->nonlocal_ = context.nextlocal_;
  30     return function;
  31 }
  32
  33 CYFunctionExpression *CYSuperize(CYContext &context, CYFunctionExpression *function) {
  34     function->super_ = context.super_;
  35     return function;
  36 }
  37
  38 CYStatement *CYDefineProperty(CYExpression *object, CYExpression *name, bool configurable, bool enumerable, CYProperty *descriptor) {
  39     return $E($C3($M($V("Object"), $S("defineProperty")), object, name, $ CYObject(CYList<CYProperty>()
  40         ->* (configurable ? $ CYPropertyValue($S("configurable"), $ CYTrue()) : NULL)
  41         ->* (enumerable ? $ CYPropertyValue($S("enumerable"), $ CYTrue()) : NULL)
  42         ->* descriptor)));
  43 }
  44
  45 static void CYImplicitReturn(CYStatement *&code) {
  46     if (CYStatement *&last = CYGetLast(code))
  47         last = last->Return();
  48 }
  49
  50 CYExpression *CYAdd::Replace(CYContext &context) {
  51     CYInfix::Replace(context);
  52
  53     CYString *lhs(dynamic_cast<CYString *>(lhs_));
  54     CYString *rhs(dynamic_cast<CYString *>(rhs_));
  55
  56     if (lhs != NULL || rhs != NULL) {
  57         if (lhs == NULL) {
  58             lhs = lhs_->String(context);
  59             if (lhs == NULL)
  60                 return this;
  61         } else if (rhs == NULL) {
  62             rhs = rhs_->String(context);
  63             if (rhs == NULL)
  64                 return this;
  65         }
  66
  67         return lhs->Concat(context, rhs);
  68     }
  69
  70     if (CYNumber *lhn = lhs_->Number(context))
  71         if (CYNumber *rhn = rhs_->Number(context))
  72             return $D(lhn->Value() + rhn->Value());
  73
  74     return this;
  75 }
  76
  77 CYExpression *CYAddressOf::Replace(CYContext &context) {
  78     return $C0($M(rhs_, $S("$cya")));
  79 }
  80
  81 CYTarget *CYApply::AddArgument(CYContext &context, CYExpression *value) {
  82     CYArgument **argument(&arguments_);
  83     while (*argument != NULL)
  84         argument = &(*argument)->next_;
  85     *argument = $ CYArgument(value);
  86     return this;
  87 }
  88
  89 CYArgument *CYArgument::Replace(CYContext &context) { $T(NULL)
  90     context.Replace(value_);
  91     next_ = next_->Replace(context);
  92
  93     if (value_ == NULL) {
  94         if (next_ == NULL)
  95             return NULL;
  96         else
  97             value_ = $U;
  98     }
  99
 100     return this;
 101 }
 102
 103 CYTarget *CYArray::Replace(CYContext &context) {
 104     if (elements_ != NULL)
 105         elements_->Replace(context);
 106     return this;
 107 }
 108
 109 CYTarget *CYArrayComprehension::Replace(CYContext &context) {
 110     CYVariable *cyv($V("$cyv"));
 111
 112     return $C0($F(NULL, $P1($L($I("$cyv")), comprehensions_->Parameters(context)), $$
 113         ->* $E($ CYAssign(cyv, $ CYArray()))
 114         ->* comprehensions_->Replace(context, $E($C1($M(cyv, $S("push")), expression_)))
 115         ->* $ CYReturn(cyv)
 116     ));
 117 }
 118
 119 CYExpression *CYAssignment::Replace(CYContext &context) {
 120     context.Replace(lhs_);
 121     context.Replace(rhs_);
 122     return this;
 123 }
 124
 125 CYStatement *CYBlock::Return() {
 126     CYImplicitReturn(code_);
 127     return this;
 128 }
 129
 130 CYStatement *CYBlock::Replace(CYContext &context) {
 131     CYScope scope(true, context);
 132     context.ReplaceAll(code_);
 133     scope.Close(context);
 134
 135     if (code_ == NULL)
 136         return $ CYEmpty();
 137     return this;
 138 }
 139
 140 CYStatement *CYBreak::Replace(CYContext &context) {
 141     return this;
 142 }
 143
 144 CYTarget *CYCall::Replace(CYContext &context) {
 145     context.Replace(function_);
 146     arguments_->Replace(context);
 147     return this;
 148 }
 149
 150 namespace cy {
 151 namespace Syntax {
 152
 153 void Catch::Replace(CYContext &context) { $T()
 154     CYScope scope(true, context);
 155
 156     name_ = name_->Replace(context, CYIdentifierCatch);
 157
 158     context.ReplaceAll(code_);
 159     scope.Close(context);
 160 }
 161
 162 } }
 163
 164 CYTarget *CYClassExpression::Replace(CYContext &context) {
 165     CYBuilder builder;
 166
 167     CYIdentifier *super(context.Unique());
 168
 169     CYIdentifier *old(context.super_);
 170     context.super_ = super;
 171
 172     CYIdentifier *constructor(context.Unique());
 173     CYForEach (member, tail_->static_)
 174         member->Replace(context, builder, $V(constructor), true);
 175
 176     CYIdentifier *prototype(context.Unique());
 177     CYForEach (member, tail_->instance_)
 178         member->Replace(context, builder, $V(prototype), true);
 179
 180     if (tail_->constructor_ == NULL)
 181         tail_->constructor_ = $ CYFunctionExpression(NULL, NULL, NULL);
 182     tail_->constructor_ = CYSuperize(context, tail_->constructor_);
 183
 184     context.super_ = old;
 185
 186     return $C1($ CYFunctionExpression(NULL, $P($L(super)), $$
 187         ->* $ CYVar($L1($L(constructor, tail_->constructor_)))
 188         ->* $ CYVar($L1($L(prototype, $ CYFunctionExpression(NULL, NULL, NULL))))
 189         ->* $E($ CYAssign($M($V(prototype), $S("prototype")), $M($V(super), $S("prototype"))))
 190         ->* $E($ CYAssign($V(prototype), $N($V(prototype))))
 191         ->* CYDefineProperty($V(prototype), $S("constructor"), false, false, $ CYPropertyValue($S("value"), $V(constructor)))
 192         ->* $ CYVar(builder.declarations_)
 193         ->* builder.statements_
 194         ->* CYDefineProperty($V(constructor), $S("prototype"), false, false, $ CYPropertyValue($S("value"), $V(prototype)))
 195         ->* $ CYReturn($V(constructor))
 196     ), tail_->extends_ ?: $V($I("Object")));
 197 }
 198
 199 CYStatement *CYClassStatement::Replace(CYContext &context) {
 200     return $ CYVar($L1($L(name_, $ CYClassExpression(name_, tail_))));
 201 }
 202
 203 void CYClause::Replace(CYContext &context) { $T()
 204     context.Replace(case_);
 205     context.ReplaceAll(code_);
 206     next_->Replace(context);
 207 }
 208
 209 CYExpression *CYCompound::Replace(CYContext &context) {
 210     context.Replace(expression_);
 211     context.Replace(next_);
 212
 213     if (CYCompound *compound = dynamic_cast<CYCompound *>(expression_)) {
 214         expression_ = compound->expression_;
 215         compound->expression_ = compound->next_;
 216         compound->next_ = next_;
 217         next_ = compound;
 218     }
 219
 220     return this;
 221 }
 222
 223 CYFunctionParameter *CYCompound::Parameter() const {
 224     CYFunctionParameter *next(next_->Parameter());
 225     if (next == NULL)
 226         return NULL;
 227
 228     CYFunctionParameter *parameter(expression_->Parameter());
 229     if (parameter == NULL)
 230         return NULL;
 231
 232     parameter->SetNext(next);
 233     return parameter;
 234 }
 235
 236 CYFunctionParameter *CYComprehension::Parameters(CYContext &context) const { $T(NULL)
 237     CYFunctionParameter *next(next_->Parameters(context));
 238     if (CYFunctionParameter *parameter = Parameter(context)) {
 239         parameter->SetNext(next);
 240         return parameter;
 241     } else
 242         return next;
 243 }
 244
 245 CYStatement *CYComprehension::Replace(CYContext &context, CYStatement *statement) const {
 246     return next_ == NULL ? statement : next_->Replace(context, statement);
 247 }
 248
 249 CYExpression *CYComputed::PropertyName(CYContext &context) {
 250     return expression_;
 251 }
 252
 253 CYExpression *CYCondition::Replace(CYContext &context) {
 254     context.Replace(test_);
 255     context.Replace(true_);
 256     context.Replace(false_);
 257     return this;
 258 }
 259
 260 void CYContext::NonLocal(CYStatement *&statements) {
 261     CYContext &context(*this);
 262
 263     if (nextlocal_ != NULL && nextlocal_->identifier_ != NULL) {
 264         CYIdentifier *cye($I("$cye")->Replace(context, CYIdentifierGlobal));
 265         CYIdentifier *unique(nextlocal_->identifier_->Replace(context, CYIdentifierGlobal));
 266
 267         CYStatement *declare(
 268             $ CYVar($L1($L(unique, $ CYObject()))));
 269
 270         cy::Syntax::Catch *rescue(
 271             $ cy::Syntax::Catch(cye, $$
 272                 ->* $ CYIf($ CYIdentical($M($V(cye), $S("$cyk")), $V(unique)), $$
 273                     ->* $ CYReturn($M($V(cye), $S("$cyv"))))
 274                 ->* $ cy::Syntax::Throw($V(cye))));
 275
 276         context.Replace(declare);
 277         rescue->Replace(context);
 278
 279         statements = $$
 280             ->* declare
 281             ->* $ cy::Syntax::Try(statements, rescue, NULL);
 282     }
 283 }
 284
 285 CYIdentifier *CYContext::Unique() {
 286     return $ CYIdentifier($pool.strcat("$cy", $pool.itoa(unique_++), NULL));
 287 }
 288
 289 CYStatement *CYContinue::Replace(CYContext &context) {
 290     return this;
 291 }
 292
 293 CYStatement *CYDebugger::Replace(CYContext &context) {
 294     return this;
 295 }
 296
 297 CYTarget *CYDeclaration::Target(CYContext &context) {
 298     return $V(identifier_);
 299 }
 300
 301 CYAssignment *CYDeclaration::Replace(CYContext &context, CYIdentifierKind kind) {
 302     identifier_ = identifier_->Replace(context, kind);
 303
 304     if (initialiser_ == NULL)
 305         return NULL;
 306
 307     CYAssignment *value($ CYAssign(Target(context), initialiser_));
 308     initialiser_ = NULL;
 309     return value;
 310 }
 311
 312 CYExpression *CYDeclarations::Replace(CYContext &context, CYIdentifierKind kind) { $T(NULL)
 313     CYAssignment *assignment(declaration_->Replace(context, kind));
 314     CYExpression *compound(next_->Replace(context, kind));
 315
 316     if (assignment != NULL)
 317         if (compound == NULL)
 318             compound = assignment;
 319         else
 320             compound = $ CYCompound(assignment, compound);
 321     return compound;
 322 }
 323
 324 CYFunctionParameter *CYDeclarations::Parameter(CYContext &context) { $T(NULL)
 325     return $ CYFunctionParameter($ CYDeclaration(declaration_->identifier_), next_->Parameter(context));
 326 }
 327
 328 CYArgument *CYDeclarations::Argument(CYContext &context) { $T(NULL)
 329     return $ CYArgument(declaration_->initialiser_, next_->Argument(context));
 330 }
 331
 332 CYTarget *CYDirectMember::Replace(CYContext &context) {
 333     context.Replace(object_);
 334     context.Replace(property_);
 335     return this;
 336 }
 337
 338 CYStatement *CYDoWhile::Replace(CYContext &context) {
 339     context.Replace(test_);
 340     context.ReplaceAll(code_);
 341     return this;
 342 }
 343
 344 void CYElementSpread::Replace(CYContext &context) {
 345     context.Replace(value_);
 346 }
 347
 348 void CYElementValue::Replace(CYContext &context) {
 349     context.Replace(value_);
 350     if (next_ != NULL)
 351         next_->Replace(context);
 352 }
 353
 354 CYForInitializer *CYEmpty::Replace(CYContext &context) {
 355     return NULL;
 356 }
 357
 358 CYTarget *CYEncodedType::Replace(CYContext &context) {
 359     return typed_->Replace(context);
 360 }
 361
 362 CYTarget *CYEval::Replace(CYContext &context) {
 363     context.scope_->Damage();
 364     if (arguments_ != NULL)
 365         arguments_->value_ = $C1($M($V("Cycript"), $S("compile")), arguments_->value_);
 366     return $C($V("eval"), arguments_);
 367 }
 368
 369 CYStatement *CYExpress::Return() {
 370     return $ CYReturn(expression_);
 371 }
 372
 373 CYForInitializer *CYExpress::Replace(CYContext &context) {
 374     context.Replace(expression_);
 375     return this;
 376 }
 377
 378 CYTarget *CYExpression::AddArgument(CYContext &context, CYExpression *value) {
 379     return $C1(this, value);
 380 }
 381
 382 CYFunctionParameter *CYExpression::Parameter() const {
 383     return NULL;
 384 }
 385
 386 CYStatement *CYExternal::Replace(CYContext &context) {
 387     return $E($ CYAssign($V(typed_->identifier_), $C1(typed_->Replace(context), $C2($V("dlsym"), $V("RTLD_DEFAULT"), $S(typed_->identifier_->Word())))));
 388 }
 389
 390 CYNumber *CYFalse::Number(CYContext &context) {
 391     return $D(0);
 392 }
 393
 394 CYString *CYFalse::String(CYContext &context) {
 395     return $S("false");
 396 }
 397
 398 CYExpression *CYFatArrow::Replace(CYContext &context) {
 399     CYFunctionExpression *function($ CYFunctionExpression(NULL, parameters_, code_));
 400     function->this_.SetNext(context.this_);
 401     return function;
 402 }
 403
 404 void CYFinally::Replace(CYContext &context) { $T()
 405     CYScope scope(true, context);
 406     context.ReplaceAll(code_);
 407     scope.Close(context);
 408 }
 409
 410 CYStatement *CYFor::Replace(CYContext &context) {
 411     CYScope outer(true, context);
 412     context.Replace(initialiser_);
 413
 414     context.Replace(test_);
 415
 416     {
 417         CYScope inner(true, context);
 418         context.ReplaceAll(code_);
 419         inner.Close(context);
 420     }
 421
 422     context.Replace(increment_);
 423
 424     outer.Close(context);
 425     return this;
 426 }
 427
 428 CYStatement *CYForLexical::Initialize(CYContext &context, CYExpression *value) {
 429     if (value == NULL) {
 430         if (declaration_->initialiser_ == NULL)
 431             return NULL;
 432         value = declaration_->initialiser_;
 433     }
 434
 435     return $ CYLet(constant_, $L1($ CYDeclaration(declaration_->identifier_, value)));
 436 }
 437
 438 CYTarget *CYForLexical::Replace(CYContext &context) {
 439     _assert(declaration_->Replace(context, CYIdentifierLexical) == NULL);
 440     return declaration_->Target(context);
 441 }
 442
 443 CYStatement *CYForIn::Replace(CYContext &context) {
 444     CYScope scope(true, context);
 445     context.Replace(initialiser_);
 446     context.Replace(set_);
 447     context.ReplaceAll(code_);
 448     scope.Close(context);
 449     return this;
 450 }
 451
 452 CYStatement *CYForInitialized::Replace(CYContext &context) {
 453     CYAssignment *assignment(declaration_->Replace(context, CYIdentifierVariable));
 454     return $ CYBlock($$
 455         ->* (assignment == NULL ? NULL : $ CYExpress(assignment))
 456         ->* $ CYForIn(declaration_->Target(context), set_, code_));
 457 }
 458
 459 CYFunctionParameter *CYForInComprehension::Parameter(CYContext &context) const {
 460     return $ CYFunctionParameter(declaration_);
 461 }
 462
 463 CYStatement *CYForInComprehension::Replace(CYContext &context, CYStatement *statement) const {
 464     return $ CYForIn(declaration_->Target(context), set_, CYComprehension::Replace(context, statement));
 465 }
 466
 467 CYStatement *CYForOf::Replace(CYContext &context) {
 468     CYIdentifier *item(context.Unique()), *list(context.Unique());
 469
 470     return $ CYBlock($$
 471         ->* initialiser_->Initialize(context, NULL)
 472         ->* $ CYLet(false, $L2($L(list, set_), $L(item)))
 473         ->* $ CYForIn($V(item), $V(list), $ CYBlock($$
 474             ->* initialiser_->Initialize(context, $M($V(list), $V(item)))
 475             ->* code_
 476     )));
 477 }
 478
 479 CYFunctionParameter *CYForOfComprehension::Parameter(CYContext &context) const {
 480     return $ CYFunctionParameter(declaration_);
 481 }
 482
 483 CYStatement *CYForOfComprehension::Replace(CYContext &context, CYStatement *statement) const {
 484     CYIdentifier *cys($I("$cys"));
 485
 486     return $E($C0($F(NULL, $P1($L($I("$cys"))), $$
 487         ->* $E($ CYAssign($V(cys), set_))
 488         ->* $ CYForIn(declaration_->Target(context), $V(cys), $ CYBlock($$
 489             ->* $E($ CYAssign(declaration_->Target(context), $M($V(cys), declaration_->Target(context))))
 490             ->* CYComprehension::Replace(context, statement)
 491         ))
 492     )));
 493 }
 494
 495 CYStatement *CYForVariable::Initialize(CYContext &context, CYExpression *value) {
 496     if (value == NULL) {
 497         if (declaration_->initialiser_ == NULL)
 498             return NULL;
 499         value = declaration_->initialiser_;
 500     }
 501
 502     return $ CYVar($L1($ CYDeclaration(declaration_->identifier_, value)));
 503 }
 504
 505 CYTarget *CYForVariable::Replace(CYContext &context) {
 506     _assert(declaration_->Replace(context, CYIdentifierVariable) == NULL);
 507     return declaration_->Target(context);
 508 }
 509
 510 // XXX: this is evil evil black magic. don't ask, don't tell... don't believe!
 511 #define MappingSet "0etnirsoalfucdphmgyvbxTwSNECAFjDLkMOIBPqzRH$_WXUVGYKQJZ"
 512 //#define MappingSet "0abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ$_"
 513
 514 void CYFunction::Replace(CYContext &context) {
 515     CYThisScope *_this(context.this_);
 516     context.this_ = &this_;
 517     context.this_ = CYGetLast(context.this_);
 518
 519     CYIdentifier *super(context.super_);
 520     context.super_ = super_;
 521
 522     CYNonLocal *nonlocal(context.nonlocal_);
 523     CYNonLocal *nextlocal(context.nextlocal_);
 524
 525     bool localize;
 526     if (nonlocal_ != NULL) {
 527         localize = false;
 528         context.nonlocal_ = nonlocal_;
 529     } else {
 530         localize = true;
 531         nonlocal_ = $ CYNonLocal();
 532         context.nextlocal_ = nonlocal_;
 533     }
 534
 535     CYScope scope(!localize, context);
 536
 537     parameters_->Replace(context, code_);
 538
 539     context.ReplaceAll(code_);
 540
 541     if (implicit_)
 542         CYImplicitReturn(code_);
 543
 544     if (CYIdentifier *identifier = this_.identifier_) {
 545         context.scope_->Declare(context, identifier, CYIdentifierVariable);
 546         code_ = $$
 547             ->* $E($ CYAssign($V(identifier), $ CYThis()))
 548             ->* code_;
 549     }
 550
 551     if (localize)
 552         context.NonLocal(code_);
 553
 554     context.nextlocal_ = nextlocal;
 555     context.nonlocal_ = nonlocal;
 556
 557     context.super_ = super;
 558     context.this_ = _this;
 559
 560     scope.Close(context, code_);
 561 }
 562
 563 CYTarget *CYFunctionExpression::Replace(CYContext &context) {
 564     CYScope scope(false, context);
 565     if (name_ != NULL)
 566         name_ = name_->Replace(context, CYIdentifierOther);
 567
 568     CYFunction::Replace(context);
 569     scope.Close(context);
 570     return this;
 571 }
 572
 573 void CYFunctionParameter::Replace(CYContext &context, CYStatement *&statements) { $T()
 574     CYAssignment *assignment(initialiser_->Replace(context, CYIdentifierArgument));
 575
 576     next_->Replace(context, statements);
 577
 578     if (assignment != NULL)
 579         statements = $$
 580             ->* $ CYIf($ CYIdentical($ CYTypeOf(initialiser_->Target(context)), $S("undefined")), $$
 581                 ->* $E(assignment))
 582             ->* statements;
 583 }
 584
 585 CYStatement *CYFunctionStatement::Replace(CYContext &context) {
 586     name_ = name_->Replace(context, CYIdentifierOther);
 587     CYFunction::Replace(context);
 588     return this;
 589 }
 590
 591 CYIdentifier *CYIdentifier::Replace(CYContext &context, CYIdentifierKind kind) {
 592     if (next_ == this)
 593         return this;
 594     if (next_ != NULL)
 595         return next_->Replace(context, kind);
 596     next_ = context.scope_->Declare(context, this, kind)->identifier_;
 597     return next_;
 598 }
 599
 600 CYStatement *CYIf::Return() {
 601     CYImplicitReturn(true_);
 602     CYImplicitReturn(false_);
 603     return this;
 604 }
 605
 606 CYStatement *CYIf::Replace(CYContext &context) {
 607     context.Replace(test_);
 608     context.ReplaceAll(true_);
 609     context.ReplaceAll(false_);
 610     return this;
 611 }
 612
 613 CYFunctionParameter *CYIfComprehension::Parameter(CYContext &context) const {
 614     return NULL;
 615 }
 616
 617 CYStatement *CYIfComprehension::Replace(CYContext &context, CYStatement *statement) const {
 618     return $ CYIf(test_, CYComprehension::Replace(context, statement));
 619 }
 620
 621 CYStatement *CYImport::Replace(CYContext &context) {
 622     return $ CYVar($L1($L($I(module_->part_->Word()), $C1($V("require"), module_->Replace(context, "/")))));
 623 }
 624
 625 CYTarget *CYIndirect::Replace(CYContext &context) {
 626     return $M(rhs_, $S("$cyi"));
 627 }
 628
 629 CYTarget *CYIndirectMember::Replace(CYContext &context) {
 630     return $M($ CYIndirect(object_), property_);
 631 }
 632
 633 CYExpression *CYInfix::Replace(CYContext &context) {
 634     context.Replace(lhs_);
 635     context.Replace(rhs_);
 636     return this;
 637 }
 638
 639 CYStatement *CYLabel::Replace(CYContext &context) {
 640     context.Replace(statement_);
 641     return this;
 642 }
 643
 644 CYTarget *CYLambda::Replace(CYContext &context) {
 645     return $N2($V("Functor"), $ CYFunctionExpression(NULL, parameters_->Parameters(context), code_), parameters_->TypeSignature(context, typed_->Replace(context)));
 646 }
 647
 648 CYForInitializer *CYLet::Replace(CYContext &context) {
 649     if (CYExpression *expression = declarations_->Replace(context, CYIdentifierLexical))
 650         return $E(expression);
 651     return $ CYEmpty();
 652 }
 653
 654 CYFunctionExpression *CYMethod::Constructor() {
 655     return NULL;
 656 }
 657
 658 void CYMethod::Replace(CYContext &context) {
 659     CYFunction::Replace(context);
 660 }
 661
 662 CYString *CYModule::Replace(CYContext &context, const char *separator) const {
 663     if (next_ == NULL)
 664         return $ CYString(part_);
 665     return $ CYString($pool.strcat(next_->Replace(context, separator)->Value(), separator, part_->Word(), NULL));
 666 }
 667
 668 CYExpression *CYMultiply::Replace(CYContext &context) {
 669     CYInfix::Replace(context);
 670
 671     if (CYNumber *lhn = lhs_->Number(context))
 672         if (CYNumber *rhn = rhs_->Number(context))
 673             return $D(lhn->Value() * rhn->Value());
 674
 675     return this;
 676 }
 677
 678 namespace cy {
 679 namespace Syntax {
 680
 681 CYTarget *New::AddArgument(CYContext &context, CYExpression *value) {
 682     CYSetLast(arguments_) = $ CYArgument(value);
 683     return this;
 684 }
 685
 686 CYTarget *New::Replace(CYContext &context) {
 687     context.Replace(constructor_);
 688     arguments_->Replace(context);
 689     return this;
 690 }
 691
 692 } }
 693
 694 CYNumber *CYNull::Number(CYContext &context) {
 695     return $D(0);
 696 }
 697
 698 CYString *CYNull::String(CYContext &context) {
 699     return $S("null");
 700 }
 701
 702 CYNumber *CYNumber::Number(CYContext &context) {
 703     return this;
 704 }
 705
 706 CYString *CYNumber::String(CYContext &context) {
 707     // XXX: there is a precise algorithm for this
 708     return $S($pool.sprintf(24, "%.17g", Value()));
 709 }
 710
 711 CYExpression *CYNumber::PropertyName(CYContext &context) {
 712     return String(context);
 713 }
 714
 715 CYTarget *CYObject::Replace(CYContext &context) {
 716     CYBuilder builder;
 717     if (properties_ != NULL)
 718         properties_ = properties_->ReplaceAll(context, builder, $ CYThis(), false);
 719
 720     if (builder) {
 721         return $C1($M($ CYFunctionExpression(NULL, builder.declarations_->Parameter(context),
 722             builder.statements_
 723                 ->* $ CYReturn($ CYThis())
 724         ), $S("call")), this, builder.declarations_->Argument(context));
 725     }
 726
 727     CYForEach (property, properties_)
 728         property->Replace(context);
 729     return this;
 730 }
 731
 732 CYTarget *CYParenthetical::Replace(CYContext &context) {
 733     // XXX: return expression_;
 734     context.Replace(expression_);
 735     return this;
 736 }
 737
 738 CYExpression *CYPostfix::Replace(CYContext &context) {
 739     context.Replace(lhs_);
 740     return this;
 741 }
 742
 743 CYExpression *CYPrefix::Replace(CYContext &context) {
 744     context.Replace(rhs_);
 745     return this;
 746 }
 747
 748 CYProperty *CYProperty::ReplaceAll(CYContext &context, CYBuilder &builder, CYExpression *self, bool update) {
 749     update |= name_->Computed();
 750     if (update)
 751         Replace(context, builder, self, false);
 752     if (next_ != NULL)
 753         next_ = next_->ReplaceAll(context, builder, self, update);
 754     return update ? next_ : this;
 755 }
 756
 757 void CYProperty::Replace(CYContext &context, CYBuilder &builder, CYExpression *self, bool protect) {
 758     CYExpression *name(name_->PropertyName(context));
 759     if (name_->Computed()) {
 760         CYIdentifier *unique(context.Unique());
 761         builder.declarations_
 762             ->* $L1($L(unique, name));
 763         name = $V(unique);
 764     }
 765
 766     Replace(context, builder, self, name, protect);
 767 }
 768
 769 void CYPropertyGetter::Replace(CYContext &context, CYBuilder &builder, CYExpression *self, CYExpression *name, bool protect) {
 770     CYIdentifier *unique(context.Unique());
 771     builder.declarations_
 772         ->* $L1($L(unique, CYSuperize(context, $ CYFunctionExpression(NULL, parameters_, code_))));
 773     builder.statements_
 774         ->* CYDefineProperty(self, name, true, !protect, $ CYPropertyValue($S("get"), $V(unique)));
 775 }
 776
 777 CYFunctionExpression *CYPropertyMethod::Constructor() {
 778     return name_->Constructor() ? $ CYFunctionExpression(NULL, parameters_, code_) : NULL;
 779 }
 780
 781 void CYPropertyMethod::Replace(CYContext &context, CYBuilder &builder, CYExpression *self, CYExpression *name, bool protect) {
 782     CYIdentifier *unique(context.Unique());
 783     builder.declarations_
 784         ->* $L1($L(unique, CYSuperize(context, $ CYFunctionExpression(NULL, parameters_, code_))));
 785     builder.statements_
 786         ->* (!protect ? $E($ CYAssign($M(self, name), $V(unique))) :
 787             CYDefineProperty(self, name, true, !protect, $ CYPropertyValue($S("value"), $V(unique), $ CYPropertyValue($S("writable"), $ CYTrue()))));
 788 }
 789
 790 void CYPropertySetter::Replace(CYContext &context, CYBuilder &builder, CYExpression *self, CYExpression *name, bool protect) {
 791     CYIdentifier *unique(context.Unique());
 792     builder.declarations_
 793         ->* $L1($L(unique, CYSuperize(context, $ CYFunctionExpression(NULL, parameters_, code_))));
 794     builder.statements_
 795         ->* CYDefineProperty(self, name, true, !protect, $ CYPropertyValue($S("set"), $V(unique)));
 796 }
 797
 798 void CYPropertyValue::Replace(CYContext &context, CYBuilder &builder, CYExpression *self, CYExpression *name, bool protect) {
 799     _assert(!protect);
 800     CYIdentifier *unique(context.Unique());
 801     builder.declarations_
 802         ->* $L1($L(unique, value_));
 803     builder.statements_
 804         ->* $E($ CYAssign($M(self, name), $V(unique)));
 805 }
 806
 807 void CYPropertyValue::Replace(CYContext &context) {
 808     context.Replace(value_);
 809 }
 810
 811 void CYScript::Replace(CYContext &context) {
 812     CYScope scope(false, context);
 813     context.scope_->Damage();
 814
 815     context.nextlocal_ = $ CYNonLocal();
 816     context.ReplaceAll(code_);
 817     context.NonLocal(code_);
 818
 819     scope.Close(context, code_);
 820
 821     unsigned offset(0);
 822
 823     for (std::vector<CYIdentifier *>::const_iterator i(context.replace_.begin()); i != context.replace_.end(); ++i) {
 824         const char *name;
 825         if (context.options_.verbose_)
 826             name = $pool.strcat("$", $pool.itoa(offset++), NULL);
 827         else {
 828             char id[8];
 829             id[7] = '\0';
 830
 831           id:
 832             unsigned position(7), local(offset++ + 1);
 833
 834             do {
 835                 unsigned index(local % (sizeof(MappingSet) - 1));
 836                 local /= sizeof(MappingSet) - 1;
 837                 id[--position] = MappingSet[index];
 838             } while (local != 0);
 839
 840             if (scope.Lookup(context, id + position) != NULL)
 841                 goto id;
 842             // XXX: at some point, this could become a keyword
 843
 844             name = $pool.strmemdup(id + position, 7 - position);
 845         }
 846
 847         CYIdentifier *identifier(*i);
 848         _assert(identifier->next_ == identifier);
 849         identifier->next_ = $I(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"), $V(context.nonlocal_->Target(context)), value)
 858         ));
 859     }
 860
 861     context.Replace(value_);
 862     return this;
 863 }
 864
 865 CYTarget *CYRubyBlock::Replace(CYContext &context) {
 866     return call_->AddArgument(context, proc_->Replace(context));
 867 }
 868
 869 CYTarget *CYRubyBlock::AddArgument(CYContext &context, CYExpression *value) {
 870     return Replace(context)->AddArgument(context, value);
 871 }
 872
 873 CYTarget *CYRubyProc::Replace(CYContext &context) {
 874     CYFunctionExpression *function($ 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     damaged_(false),
 884     shadow_(NULL),
 885     internal_(NULL)
 886 {
 887     _assert(!transparent_ || parent_ != NULL);
 888     context.scope_ = this;
 889 }
 890
 891 void CYScope::Damage() {
 892     damaged_ = true;
 893     if (parent_ != NULL)
 894         parent_->Damage();
 895 }
 896
 897 CYIdentifierFlags *CYScope::Lookup(CYContext &context, const char *word) {
 898     CYForEach (i, internal_)
 899         if (strcmp(i->identifier_->Word(), word) == 0)
 900             return i;
 901     return NULL;
 902 }
 903
 904 CYIdentifierFlags *CYScope::Lookup(CYContext &context, CYIdentifier *identifier) {
 905     return Lookup(context, identifier->Word());
 906 }
 907
 908 CYIdentifierFlags *CYScope::Declare(CYContext &context, CYIdentifier *identifier, CYIdentifierKind kind) {
 909     _assert(identifier->next_ == NULL || identifier->next_ == identifier);
 910
 911     CYIdentifierFlags *existing(Lookup(context, identifier));
 912     if (existing == NULL)
 913         internal_ = $ CYIdentifierFlags(identifier, kind, internal_);
 914     ++internal_->count_;
 915     if (existing == NULL)
 916         return internal_;
 917
 918     switch (kind) {
 919         case CYIdentifierArgument:
 920         case CYIdentifierCatch:
 921         case CYIdentifierMagic:
 922             _assert(false);
 923         default:
 924             break;
 925     }
 926
 927     if (existing->kind_ == CYIdentifierGlobal)
 928         existing->kind_ = kind;
 929     else if (kind == CYIdentifierGlobal)
 930         ;
 931     else if (existing->kind_ == CYIdentifierLexical || kind == CYIdentifierLexical)
 932         _assert(false); // XXX: throw new SyntaxError()
 933
 934     return existing;
 935 }
 936
 937 void CYScope::Merge(CYContext &context, const CYIdentifierFlags *flags) {
 938     _assert(flags->identifier_->next_ == flags->identifier_);
 939     CYIdentifierFlags *existing(Declare(context, flags->identifier_, flags->kind_));
 940     flags->identifier_->next_ = existing->identifier_;
 941
 942     existing->count_ += flags->count_;
 943     if (existing->offset_ < flags->offset_)
 944         existing->offset_ = flags->offset_;
 945 }
 946
 947 void CYScope::Close(CYContext &context, CYStatement *&statements) {
 948     Close(context);
 949
 950     CYList<CYDeclarations> declarations;
 951
 952     CYForEach (i, internal_)
 953         if (i->kind_ == CYIdentifierVariable)
 954             declarations
 955                 ->* $ CYDeclarations($ CYDeclaration(i->identifier_));
 956
 957     if (declarations) {
 958         CYVar *var($ CYVar(declarations));
 959         var->SetNext(statements);
 960         statements = var;
 961     }
 962 }
 963
 964 void CYScope::Close(CYContext &context) {
 965     context.scope_ = parent_;
 966
 967     CYForEach (i, internal_) {
 968         _assert(i->identifier_->next_ == i->identifier_);
 969     switch (i->kind_) {
 970         case CYIdentifierArgument: {
 971             _assert(!transparent_);
 972         } break;
 973
 974         case CYIdentifierLexical: {
 975             if (!damaged_) {
 976                 CYIdentifier *replace(context.Unique());
 977                 replace->next_ = replace;
 978                 i->identifier_->next_ = replace;
 979                 i->identifier_ = replace;
 980             }
 981
 982             if (!transparent_)
 983                 i->kind_ = CYIdentifierVariable;
 984             else
 985                 parent_->Declare(context, i->identifier_, CYIdentifierVariable);
 986         } break;
 987
 988         case CYIdentifierVariable: {
 989             if (transparent_) {
 990                 parent_->Declare(context, i->identifier_, i->kind_);
 991                 i->kind_ = CYIdentifierGlobal;
 992             }
 993         } break;
 994     default:; } }
 995
 996     if (damaged_)
 997         return;
 998
 999     typedef std::multimap<unsigned, CYIdentifier *> CYIdentifierOffsetMap;
1000     CYIdentifierOffsetMap offsets;
1001
1002     CYForEach (i, internal_) {
1003         _assert(i->identifier_->next_ == i->identifier_);
1004     switch (i->kind_) {
1005         case CYIdentifierArgument:
1006         case CYIdentifierVariable:
1007             offsets.insert(CYIdentifierOffsetMap::value_type(i->offset_, i->identifier_));
1008         break;
1009     default:; } }
1010
1011     unsigned offset(0);
1012
1013     for (CYIdentifierOffsetMap::const_iterator i(offsets.begin()); i != offsets.end(); ++i) {
1014         if (offset < i->first)
1015             offset = i->first;
1016         CYIdentifier *identifier(i->second);
1017
1018         if (offset >= context.replace_.size())
1019             context.replace_.resize(offset + 1, NULL);
1020         CYIdentifier *&replace(context.replace_[offset++]);
1021
1022         if (replace == NULL)
1023             replace = identifier;
1024         else {
1025             _assert(replace->next_ == replace);
1026             identifier->next_ = replace;
1027         }
1028     }
1029
1030     if (parent_ == NULL)
1031         return;
1032
1033     CYForEach (i, internal_) {
1034     switch (i->kind_) {
1035         case CYIdentifierGlobal: {
1036             if (i->offset_ < offset)
1037                 i->offset_ = offset;
1038             parent_->Merge(context, i);
1039         } break;
1040     default:; } }
1041 }
1042
1043 CYElementValue *CYSpan::Replace(CYContext &context) { $T(NULL)
1044     return $ CYElementValue(expression_, $ CYElementValue(string_, next_->Replace(context)));
1045 }
1046
1047 CYStatement *CYStatement::Return() {
1048     return this;
1049 }
1050
1051 CYString *CYString::Concat(CYContext &context, CYString *rhs) const {
1052     size_t size(size_ + rhs->size_);
1053     char *value($ char[size + 1]);
1054     memcpy(value, value_, size_);
1055     memcpy(value + size_, rhs->value_, rhs->size_);
1056     value[size] = '\0';
1057     return $S(value, size);
1058 }
1059
1060 CYNumber *CYString::Number(CYContext &context) {
1061     // XXX: there is a precise algorithm for this
1062     return NULL;
1063 }
1064
1065 CYExpression *CYString::PropertyName(CYContext &context) {
1066     return this;
1067 }
1068
1069 CYString *CYString::String(CYContext &context) {
1070     return this;
1071 }
1072
1073 CYTarget *CYSuperAccess::Replace(CYContext &context) {
1074     return $C1($M($M($M($V(context.super_), $S("prototype")), property_), $S("bind")), $ CYThis());
1075 }
1076
1077 CYTarget *CYSuperCall::Replace(CYContext &context) {
1078     return $C($C1($M($V(context.super_), $S("bind")), $ CYThis()), arguments_);
1079 }
1080
1081 CYStatement *CYSwitch::Replace(CYContext &context) {
1082     context.Replace(value_);
1083     clauses_->Replace(context);
1084     return this;
1085 }
1086
1087 CYStatement *CYTarget::Initialize(CYContext &context, CYExpression *value) {
1088     if (value == NULL)
1089         return NULL;
1090     return $E($ CYAssign(this, value));
1091 }
1092
1093 CYTarget *CYTemplate::Replace(CYContext &context) {
1094     return $C2($M($M($M($V("String"), $S("prototype")), $S("concat")), $S("apply")), $S(""), $ CYArray($ CYElementValue(string_, spans_->Replace(context))));
1095 }
1096
1097 CYTarget *CYThis::Replace(CYContext &context) {
1098     if (context.this_ != NULL)
1099         return $V(context.this_->Identifier(context));
1100     return this;
1101 }
1102
1103 namespace cy {
1104 namespace Syntax {
1105
1106 CYStatement *Throw::Replace(CYContext &context) {
1107     context.Replace(value_);
1108     return this;
1109 }
1110
1111 } }
1112
1113 CYTarget *CYTrivial::Replace(CYContext &context) {
1114     return this;
1115 }
1116
1117 CYNumber *CYTrue::Number(CYContext &context) {
1118     return $D(1);
1119 }
1120
1121 CYString *CYTrue::String(CYContext &context) {
1122     return $S("true");
1123 }
1124
1125 namespace cy {
1126 namespace Syntax {
1127
1128 CYStatement *Try::Replace(CYContext &context) {
1129     CYScope scope(true, context);
1130     context.ReplaceAll(code_);
1131     scope.Close(context);
1132
1133     catch_->Replace(context);
1134     finally_->Replace(context);
1135     return this;
1136 }
1137
1138 } }
1139
1140 CYTarget *CYTypeArrayOf::Replace_(CYContext &context, CYTarget *type) {
1141     return next_->Replace(context, $ CYCall($ CYDirectMember(type, $ CYString("arrayOf")), $ CYArgument(size_)));
1142 }
1143
1144 CYTarget *CYTypeBlockWith::Replace_(CYContext &context, CYTarget *type) {
1145     return next_->Replace(context, $ CYCall($ CYDirectMember(type, $ CYString("blockWith")), parameters_->Argument(context)));
1146 }
1147
1148 CYTarget *CYTypeConstant::Replace_(CYContext &context, CYTarget *type) {
1149     return next_->Replace(context, $ CYCall($ CYDirectMember(type, $ CYString("constant"))));
1150 }
1151
1152 CYStatement *CYTypeDefinition::Replace(CYContext &context) {
1153     return $E($ CYAssign($V(typed_->identifier_), typed_->Replace(context)));
1154 }
1155
1156 CYTarget *CYTypeError::Replace(CYContext &context) {
1157     _assert(false);
1158     return NULL;
1159 }
1160
1161 CYTarget *CYTypeModifier::Replace(CYContext &context, CYTarget *type) { $T(type)
1162     return Replace_(context, type);
1163 }
1164
1165 CYTarget *CYTypeFunctionWith::Replace_(CYContext &context, CYTarget *type) {
1166     return next_->Replace(context, $ CYCall($ CYDirectMember(type, $ CYString("functionWith")), parameters_->Argument(context)));
1167 }
1168
1169 CYTarget *CYTypeLong::Replace(CYContext &context) {
1170     return $ CYCall($ CYDirectMember(specifier_->Replace(context), $ CYString("long")));
1171 }
1172
1173 CYTarget *CYTypePointerTo::Replace_(CYContext &context, CYTarget *type) {
1174     return next_->Replace(context, $ CYCall($ CYDirectMember(type, $ CYString("pointerTo"))));
1175 }
1176
1177 CYTarget *CYTypeShort::Replace(CYContext &context) {
1178     return $ CYCall($ CYDirectMember(specifier_->Replace(context), $ CYString("short")));
1179 }
1180
1181 CYTarget *CYTypeSigned::Replace(CYContext &context) {
1182     return $ CYCall($ CYDirectMember(specifier_->Replace(context), $ CYString("signed")));
1183 }
1184
1185 CYTarget *CYTypeUnsigned::Replace(CYContext &context) {
1186     return $ CYCall($ CYDirectMember(specifier_->Replace(context), $ CYString("unsigned")));
1187 }
1188
1189 CYTarget *CYTypeVariable::Replace(CYContext &context) {
1190     return $V(name_);
1191 }
1192
1193 CYTarget *CYTypeVoid::Replace(CYContext &context) {
1194     return $N1($V("Type"), $ CYString("v"));
1195 }
1196
1197 CYTarget *CYTypeVolatile::Replace_(CYContext &context, CYTarget *type) {
1198     return next_->Replace(context, $ CYCall($ CYDirectMember(type, $ CYString("volatile"))));
1199 }
1200
1201 CYTarget *CYTypedIdentifier::Replace(CYContext &context) {
1202     return modifier_->Replace(context, specifier_->Replace(context));
1203 }
1204
1205 CYTypeFunctionWith *CYTypedIdentifier::Function() {
1206     CYTypeModifier **modifier(&modifier_);
1207     if (*modifier == NULL)
1208         return NULL;
1209     while ((*modifier)->next_ != NULL)
1210         modifier = &(*modifier)->next_;
1211     CYTypeFunctionWith *function((*modifier)->Function());
1212     if (function == NULL)
1213         return NULL;
1214     *modifier = NULL;
1215     return function;
1216 }
1217
1218 CYArgument *CYTypedParameter::Argument(CYContext &context) { $T(NULL)
1219     return $ CYArgument(typed_->Replace(context), next_->Argument(context));
1220 }
1221
1222 CYFunctionParameter *CYTypedParameter::Parameters(CYContext &context) { $T(NULL)
1223     return $ CYFunctionParameter($ CYDeclaration(typed_->identifier_ ?: context.Unique()), next_->Parameters(context));
1224 }
1225
1226 CYExpression *CYTypedParameter::TypeSignature(CYContext &context, CYExpression *prefix) { $T(prefix)
1227     return next_->TypeSignature(context, $ CYAdd(prefix, typed_->Replace(context)));
1228 }
1229
1230 CYForInitializer *CYVar::Replace(CYContext &context) {
1231     if (CYExpression *expression = declarations_->Replace(context, CYIdentifierVariable))
1232         return $E(expression);
1233     return $ CYEmpty();
1234 }
1235
1236 CYTarget *CYVariable::Replace(CYContext &context) {
1237     name_ = name_->Replace(context, CYIdentifierGlobal);
1238     return this;
1239 }
1240
1241 CYFunctionParameter *CYVariable::Parameter() const {
1242     return $ CYFunctionParameter($ CYDeclaration(name_));
1243 }
1244
1245 CYStatement *CYWhile::Replace(CYContext &context) {
1246     context.Replace(test_);
1247     context.ReplaceAll(code_);
1248     return this;
1249 }
1250
1251 CYStatement *CYWith::Replace(CYContext &context) {
1252     context.Replace(scope_);
1253     context.ReplaceAll(code_);
1254     return this;
1255 }
1256
1257 CYExpression *CYWord::PropertyName(CYContext &context) {
1258     return $S(this);
1259 }