Replace.cpp

   1 /* Cycript - The Truly Universal Scripting Language
   2  * Copyright (C) 2009-2016  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     CYForEach (element, elements_)
 105         element->Replace(context);
 106     return this;
 107 }
 108
 109 CYTarget *CYArrayComprehension::Replace(CYContext &context) {
 110     CYIdentifier *cyv(context.Unique());
 111
 112     return $C0($F(NULL, $P1($B(cyv), comprehensions_->Parameters(context)), $$
 113         ->* $E($ CYAssign($V(cyv), $ CYArray()))
 114         ->* comprehensions_->Replace(context, $E($C1($M($V(cyv), $S("push")), expression_)))
 115         ->* $ CYReturn($V(cyv))
 116     ));
 117 }
 118
 119 CYExpression *CYAssignment::Replace(CYContext &context) {
 120     // XXX: this is a horrible hack but I'm a month over schedule :(
 121     if (CYSubscriptMember *subscript = dynamic_cast<CYSubscriptMember *>(lhs_))
 122         return $C2($M(subscript->object_, $S("$cys")), subscript->property_, rhs_);
 123     context.Replace(lhs_);
 124     context.Replace(rhs_);
 125     return this;
 126 }
 127
 128 CYStatement *CYBlock::Return() {
 129     CYImplicitReturn(code_);
 130     return this;
 131 }
 132
 133 CYStatement *CYBlock::Replace(CYContext &context) {
 134     CYScope scope(true, context);
 135     context.ReplaceAll(code_);
 136     scope.Close(context);
 137
 138     if (code_ == NULL)
 139         return $ CYEmpty();
 140     return this;
 141 }
 142
 143 CYStatement *CYBreak::Replace(CYContext &context) {
 144     return this;
 145 }
 146
 147 CYTarget *CYCall::Replace(CYContext &context) {
 148     context.Replace(function_);
 149     arguments_->Replace(context);
 150     return this;
 151 }
 152
 153 namespace cy {
 154 namespace Syntax {
 155
 156 void Catch::Replace(CYContext &context) { $T()
 157     CYScope scope(true, context);
 158
 159     name_ = name_->Replace(context, CYIdentifierCatch);
 160
 161     context.ReplaceAll(code_);
 162     scope.Close(context);
 163 }
 164
 165 } }
 166
 167 CYTarget *CYClassExpression::Replace(CYContext &context) {
 168     CYBuilder builder;
 169
 170     CYIdentifier *super(context.Unique());
 171
 172     CYIdentifier *old(context.super_);
 173     context.super_ = super;
 174
 175     CYIdentifier *constructor(context.Unique());
 176     CYForEach (member, tail_->static_)
 177         member->Replace(context, builder, $V(constructor), true);
 178
 179     CYIdentifier *prototype(context.Unique());
 180     CYForEach (member, tail_->instance_)
 181         member->Replace(context, builder, $V(prototype), true);
 182
 183     if (tail_->constructor_ == NULL)
 184         tail_->constructor_ = $ CYFunctionExpression(NULL, NULL, NULL);
 185     tail_->constructor_ = CYSuperize(context, tail_->constructor_);
 186
 187     context.super_ = old;
 188
 189     return $C1($ CYFunctionExpression(NULL, $P($B(super)), $$
 190         ->* $ CYVar($B1($B(constructor, tail_->constructor_)))
 191         ->* $ CYVar($B1($B(prototype, $ CYFunctionExpression(NULL, NULL, NULL))))
 192         ->* $E($ CYAssign($M($V(prototype), $S("prototype")), $M($V(super), $S("prototype"))))
 193         ->* $E($ CYAssign($V(prototype), $N($V(prototype))))
 194         ->* CYDefineProperty($V(prototype), $S("constructor"), false, false, $ CYPropertyValue($S("value"), $V(constructor)))
 195         ->* $ CYVar(builder.bindings_)
 196         ->* builder.statements_
 197         ->* CYDefineProperty($V(constructor), $S("prototype"), false, false, $ CYPropertyValue($S("value"), $V(prototype)))
 198         ->* $ CYReturn($V(constructor))
 199     ), tail_->extends_ ?: $V($I("Object")));
 200 }
 201
 202 CYStatement *CYClassStatement::Replace(CYContext &context) {
 203     return $ CYVar($B1($B(name_, $ CYClassExpression(name_, tail_))));
 204 }
 205
 206 void CYClause::Replace(CYContext &context) { $T()
 207     context.Replace(value_);
 208     context.ReplaceAll(code_);
 209     next_->Replace(context);
 210 }
 211
 212 CYExpression *CYCompound::Replace(CYContext &context) {
 213     context.Replace(expression_);
 214     context.Replace(next_);
 215
 216     if (CYCompound *compound = dynamic_cast<CYCompound *>(expression_)) {
 217         expression_ = compound->expression_;
 218         compound->expression_ = compound->next_;
 219         compound->next_ = next_;
 220         next_ = compound;
 221     }
 222
 223     return this;
 224 }
 225
 226 CYFunctionParameter *CYCompound::Parameter() const {
 227     CYFunctionParameter *next(next_->Parameter());
 228     if (next == NULL)
 229         return NULL;
 230
 231     CYFunctionParameter *parameter(expression_->Parameter());
 232     if (parameter == NULL)
 233         return NULL;
 234
 235     parameter->SetNext(next);
 236     return parameter;
 237 }
 238
 239 CYFunctionParameter *CYComprehension::Parameters(CYContext &context) const { $T(NULL)
 240     CYFunctionParameter *next(next_->Parameters(context));
 241     if (CYFunctionParameter *parameter = Parameter(context)) {
 242         parameter->SetNext(next);
 243         return parameter;
 244     } else
 245         return next;
 246 }
 247
 248 CYStatement *CYComprehension::Replace(CYContext &context, CYStatement *statement) const {
 249     return next_ == NULL ? statement : next_->Replace(context, statement);
 250 }
 251
 252 CYExpression *CYComputed::PropertyName(CYContext &context) {
 253     return expression_;
 254 }
 255
 256 CYExpression *CYCondition::Replace(CYContext &context) {
 257     context.Replace(test_);
 258     context.Replace(true_);
 259     context.Replace(false_);
 260     return this;
 261 }
 262
 263 void CYContext::NonLocal(CYStatement *&statements) {
 264     CYContext &context(*this);
 265
 266     if (nextlocal_ != NULL && nextlocal_->identifier_ != NULL) {
 267         CYIdentifier *cye($I("$cye")->Replace(context, CYIdentifierGlobal));
 268         CYIdentifier *unique(nextlocal_->identifier_->Replace(context, CYIdentifierGlobal));
 269
 270         CYStatement *declare(
 271             $ CYVar($B1($B(unique, $ CYObject()))));
 272
 273         cy::Syntax::Catch *rescue(
 274             $ cy::Syntax::Catch(cye, $$
 275                 ->* $ CYIf($ CYIdentical($M($V(cye), $S("$cyk")), $V(unique)), $$
 276                     ->* $ CYReturn($M($V(cye), $S("$cyv"))))
 277                 ->* $ cy::Syntax::Throw($V(cye))));
 278
 279         context.Replace(declare);
 280         rescue->Replace(context);
 281
 282         statements = $$
 283             ->* declare
 284             ->* $ cy::Syntax::Try(statements, rescue, NULL);
 285     }
 286 }
 287
 288 CYIdentifier *CYContext::Unique() {
 289     return $ CYIdentifier($pool.strcat("$cy", $pool.itoa(unique_++), NULL));
 290 }
 291
 292 CYStatement *CYContinue::Replace(CYContext &context) {
 293     return this;
 294 }
 295
 296 CYStatement *CYDebugger::Replace(CYContext &context) {
 297     return this;
 298 }
 299
 300 CYTarget *CYBinding::Target(CYContext &context) {
 301     return $V(identifier_);
 302 }
 303
 304 CYAssignment *CYBinding::Replace(CYContext &context, CYIdentifierKind kind) {
 305     identifier_ = identifier_->Replace(context, kind);
 306
 307     if (initializer_ == NULL)
 308         return NULL;
 309
 310     CYAssignment *value($ CYAssign(Target(context), initializer_));
 311     initializer_ = NULL;
 312     return value;
 313 }
 314
 315 CYExpression *CYBindings::Replace(CYContext &context, CYIdentifierKind kind) { $T(NULL)
 316     CYAssignment *assignment(binding_->Replace(context, kind));
 317     CYExpression *compound(next_->Replace(context, kind));
 318
 319     if (assignment != NULL)
 320         if (compound == NULL)
 321             compound = assignment;
 322         else
 323             compound = $ CYCompound(assignment, compound);
 324     return compound;
 325 }
 326
 327 CYFunctionParameter *CYBindings::Parameter(CYContext &context) { $T(NULL)
 328     return $ CYFunctionParameter($ CYBinding(binding_->identifier_), next_->Parameter(context));
 329 }
 330
 331 CYArgument *CYBindings::Argument(CYContext &context) { $T(NULL)
 332     return $ CYArgument(binding_->initializer_, next_->Argument(context));
 333 }
 334
 335 CYTarget *CYDirectMember::Replace(CYContext &context) {
 336     context.Replace(object_);
 337     context.Replace(property_);
 338     return this;
 339 }
 340
 341 CYStatement *CYDoWhile::Replace(CYContext &context) {
 342     context.Replace(test_);
 343     context.ReplaceAll(code_);
 344     return this;
 345 }
 346
 347 void CYElementSpread::Replace(CYContext &context) {
 348     context.Replace(value_);
 349 }
 350
 351 void CYElementValue::Replace(CYContext &context) {
 352     context.Replace(value_);
 353 }
 354
 355 CYForInitializer *CYEmpty::Replace(CYContext &context) {
 356     return NULL;
 357 }
 358
 359 CYTarget *CYEncodedType::Replace(CYContext &context) {
 360     return typed_->Replace(context);
 361 }
 362
 363 CYTarget *CYEval::Replace(CYContext &context) {
 364     context.scope_->Damage();
 365     if (arguments_ != NULL)
 366         arguments_->value_ = $C1($M($V("Cycript"), $S("compile")), arguments_->value_);
 367     return $C($V("eval"), arguments_);
 368 }
 369
 370 CYStatement *CYExpress::Return() {
 371     return $ CYReturn(expression_);
 372 }
 373
 374 CYForInitializer *CYExpress::Replace(CYContext &context) {
 375     context.Replace(expression_);
 376     return this;
 377 }
 378
 379 CYTarget *CYExpression::AddArgument(CYContext &context, CYExpression *value) {
 380     return $C1(this, value);
 381 }
 382
 383 CYFunctionParameter *CYExpression::Parameter() const {
 384     return NULL;
 385 }
 386
 387 CYTarget *CYExtend::Replace(CYContext &context) {
 388     return object_.Replace(context, lhs_);
 389 }
 390
 391 CYStatement *CYExternal::Replace(CYContext &context) {
 392     return $E($ CYAssign($V(typed_->identifier_), $C1(typed_->Replace(context), $C2($V("dlsym"), $V("RTLD_DEFAULT"), $S(typed_->identifier_->Word())))));
 393 }
 394
 395 CYNumber *CYFalse::Number(CYContext &context) {
 396     return $D(0);
 397 }
 398
 399 CYString *CYFalse::String(CYContext &context) {
 400     return $S("false");
 401 }
 402
 403 CYExpression *CYFatArrow::Replace(CYContext &context) {
 404     CYFunctionExpression *function($ CYFunctionExpression(NULL, parameters_, code_));
 405     function->this_.SetNext(context.this_);
 406     return function;
 407 }
 408
 409 void CYFinally::Replace(CYContext &context) { $T()
 410     CYScope scope(true, context);
 411     context.ReplaceAll(code_);
 412     scope.Close(context);
 413 }
 414
 415 CYStatement *CYFor::Replace(CYContext &context) {
 416     CYScope outer(true, context);
 417     context.Replace(initializer_);
 418
 419     context.Replace(test_);
 420
 421     {
 422         CYScope inner(true, context);
 423         context.ReplaceAll(code_);
 424         inner.Close(context);
 425     }
 426
 427     context.Replace(increment_);
 428
 429     outer.Close(context);
 430     return this;
 431 }
 432
 433 CYStatement *CYForLexical::Initialize(CYContext &context, CYExpression *value) {
 434     if (value == NULL) {
 435         if (binding_->initializer_ == NULL)
 436             return NULL;
 437         value = binding_->initializer_;
 438     }
 439
 440     return $ CYLexical(constant_, $B1($ CYBinding(binding_->identifier_, value)));
 441 }
 442
 443 CYTarget *CYForLexical::Replace(CYContext &context) {
 444     _assert(binding_->Replace(context, CYIdentifierLexical) == NULL);
 445     return binding_->Target(context);
 446 }
 447
 448 CYStatement *CYForIn::Replace(CYContext &context) {
 449     CYScope scope(true, context);
 450     context.Replace(initializer_);
 451     context.Replace(iterable_);
 452     context.ReplaceAll(code_);
 453     scope.Close(context);
 454     return this;
 455 }
 456
 457 CYStatement *CYForInitialized::Replace(CYContext &context) {
 458     CYAssignment *assignment(binding_->Replace(context, CYIdentifierVariable));
 459     return $ CYBlock($$
 460         ->* (assignment == NULL ? NULL : $ CYExpress(assignment))
 461         ->* $ CYForIn(binding_->Target(context), iterable_, code_));
 462 }
 463
 464 CYFunctionParameter *CYForInComprehension::Parameter(CYContext &context) const {
 465     return $ CYFunctionParameter(binding_);
 466 }
 467
 468 CYStatement *CYForInComprehension::Replace(CYContext &context, CYStatement *statement) const {
 469     return $ CYForIn(binding_->Target(context), iterable_, CYComprehension::Replace(context, statement));
 470 }
 471
 472 CYStatement *CYForOf::Replace(CYContext &context) {
 473     CYIdentifier *item(context.Unique()), *list(context.Unique());
 474
 475     return $ CYBlock($$
 476         ->* initializer_->Initialize(context, NULL)
 477         ->* $ CYLexical(false, $B2($B(list, iterable_), $B(item)))
 478         ->* $ CYForIn($V(item), $V(list), $ CYBlock($$
 479             ->* initializer_->Initialize(context, $M($V(list), $V(item)))
 480             ->* code_
 481     )));
 482 }
 483
 484 CYFunctionParameter *CYForOfComprehension::Parameter(CYContext &context) const {
 485     return $ CYFunctionParameter(binding_);
 486 }
 487
 488 CYStatement *CYForOfComprehension::Replace(CYContext &context, CYStatement *statement) const {
 489     CYIdentifier *cys(context.Unique());
 490
 491     return $ CYBlock($$
 492         ->* $ CYLexical(false, $B1($B(cys, iterable_)))
 493         ->* $ CYForIn(binding_->Target(context), $V(cys), $ CYBlock($$
 494             ->* $E($ CYAssign(binding_->Target(context), $M($V(cys), binding_->Target(context))))
 495             ->* CYComprehension::Replace(context, statement)
 496     )));
 497 }
 498
 499 CYStatement *CYForVariable::Initialize(CYContext &context, CYExpression *value) {
 500     if (value == NULL) {
 501         if (binding_->initializer_ == NULL)
 502             return NULL;
 503         value = binding_->initializer_;
 504     }
 505
 506     return $ CYVar($B1($ CYBinding(binding_->identifier_, value)));
 507 }
 508
 509 CYTarget *CYForVariable::Replace(CYContext &context) {
 510     _assert(binding_->Replace(context, CYIdentifierVariable) == NULL);
 511     return binding_->Target(context);
 512 }
 513
 514 // XXX: this is evil evil black magic. don't ask, don't tell... don't believe!
 515 #define MappingSet "0etnirsoalfucdphmgyvbxTwSNECAFjDLkMOIBPqzRH$_WXUVGYKQJZ"
 516 //#define MappingSet "0abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ$_"
 517
 518 void CYFunction::Replace(CYContext &context) {
 519     CYThisScope *_this(context.this_);
 520     context.this_ = &this_;
 521     context.this_ = CYGetLast(context.this_);
 522
 523     CYIdentifier *super(context.super_);
 524     context.super_ = super_;
 525
 526     CYNonLocal *nonlocal(context.nonlocal_);
 527     CYNonLocal *nextlocal(context.nextlocal_);
 528
 529     bool localize;
 530     if (nonlocal_ != NULL) {
 531         localize = false;
 532         context.nonlocal_ = nonlocal_;
 533     } else {
 534         localize = true;
 535         nonlocal_ = $ CYNonLocal();
 536         context.nextlocal_ = nonlocal_;
 537     }
 538
 539     CYScope scope(!localize, context);
 540
 541     $I("arguments")->Replace(context, CYIdentifierMagic);
 542
 543     parameters_->Replace(context, code_);
 544
 545     context.ReplaceAll(code_);
 546
 547     if (implicit_)
 548         CYImplicitReturn(code_);
 549
 550     if (CYIdentifier *identifier = this_.identifier_) {
 551         context.scope_->Declare(context, identifier, CYIdentifierVariable);
 552         code_ = $$
 553             ->* $E($ CYAssign($V(identifier), $ CYThis()))
 554             ->* code_;
 555     }
 556
 557     if (localize)
 558         context.NonLocal(code_);
 559
 560     context.nextlocal_ = nextlocal;
 561     context.nonlocal_ = nonlocal;
 562
 563     context.super_ = super;
 564     context.this_ = _this;
 565
 566     scope.Close(context, code_);
 567 }
 568
 569 CYTarget *CYFunctionExpression::Replace(CYContext &context) {
 570     CYScope scope(false, context);
 571     if (name_ != NULL)
 572         name_ = name_->Replace(context, CYIdentifierOther);
 573
 574     CYFunction::Replace(context);
 575     scope.Close(context);
 576     return this;
 577 }
 578
 579 void CYFunctionParameter::Replace(CYContext &context, CYStatement *&statements) { $T()
 580     CYAssignment *assignment(binding_->Replace(context, CYIdentifierArgument));
 581
 582     next_->Replace(context, statements);
 583
 584     if (assignment != NULL)
 585         statements = $$
 586             ->* $ CYIf($ CYIdentical($ CYTypeOf(binding_->Target(context)), $S("undefined")), $$
 587                 ->* $E(assignment))
 588             ->* statements;
 589 }
 590
 591 CYStatement *CYFunctionStatement::Replace(CYContext &context) {
 592     name_ = name_->Replace(context, CYIdentifierOther);
 593     CYFunction::Replace(context);
 594     return this;
 595 }
 596
 597 CYIdentifier *CYIdentifier::Replace(CYContext &context, CYIdentifierKind kind) {
 598     if (next_ == this)
 599         return this;
 600     if (next_ != NULL)
 601         return next_->Replace(context, kind);
 602     next_ = context.scope_->Declare(context, this, kind)->identifier_;
 603     return next_;
 604 }
 605
 606 CYStatement *CYIf::Return() {
 607     CYImplicitReturn(true_);
 608     CYImplicitReturn(false_);
 609     return this;
 610 }
 611
 612 CYStatement *CYIf::Replace(CYContext &context) {
 613     context.Replace(test_);
 614     context.ReplaceAll(true_);
 615     context.ReplaceAll(false_);
 616     return this;
 617 }
 618
 619 CYFunctionParameter *CYIfComprehension::Parameter(CYContext &context) const {
 620     return NULL;
 621 }
 622
 623 CYStatement *CYIfComprehension::Replace(CYContext &context, CYStatement *statement) const {
 624     return $ CYIf(test_, CYComprehension::Replace(context, statement));
 625 }
 626
 627 CYStatement *CYImport::Replace(CYContext &context) {
 628     return $ CYVar($B1($B($I(module_->part_->Word()), $C1($V("require"), module_->Replace(context, "/")))));
 629 }
 630
 631 CYStatement *CYImportDeclaration::Replace(CYContext &context) {
 632     CYIdentifier *module(context.Unique());
 633
 634     CYList<CYStatement> statements;
 635     CYForEach (specifier, specifiers_)
 636         statements->*specifier->Replace(context, module);
 637
 638     return $ CYBlock($$
 639         ->* $ CYLexical(false, $B1($B(module, $C1($V("require"), module_))))
 640         ->* statements);
 641 }
 642
 643 CYStatement *CYImportSpecifier::Replace(CYContext &context, CYIdentifier *module) {
 644     binding_ = binding_->Replace(context, CYIdentifierLexical);
 645
 646     CYExpression *import($V(module));
 647     if (name_ != NULL)
 648         import = $M(import, $S(name_));
 649     return $E($ CYAssign($V(binding_), import));
 650 }
 651
 652 CYTarget *CYIndirect::Replace(CYContext &context) {
 653     return $M(rhs_, $S("$cyi"));
 654 }
 655
 656 CYTarget *CYIndirectMember::Replace(CYContext &context) {
 657     return $M($ CYIndirect(object_), property_);
 658 }
 659
 660 CYExpression *CYInfix::Replace(CYContext &context) {
 661     context.Replace(lhs_);
 662     context.Replace(rhs_);
 663     return this;
 664 }
 665
 666 CYStatement *CYLabel::Replace(CYContext &context) {
 667     context.Replace(statement_);
 668     return this;
 669 }
 670
 671 CYTarget *CYLambda::Replace(CYContext &context) {
 672     return $N2($V("Functor"), $ CYFunctionExpression(NULL, parameters_->Parameters(context), code_), parameters_->TypeSignature(context, typed_->Replace(context)));
 673 }
 674
 675 CYForInitializer *CYLexical::Replace(CYContext &context) {
 676     if (CYExpression *expression = bindings_->Replace(context, CYIdentifierLexical))
 677         return $E(expression);
 678     return $ CYEmpty();
 679 }
 680
 681 CYFunctionExpression *CYMethod::Constructor() {
 682     return NULL;
 683 }
 684
 685 void CYMethod::Replace(CYContext &context) {
 686     CYFunction::Replace(context);
 687 }
 688
 689 CYString *CYModule::Replace(CYContext &context, const char *separator) const {
 690     if (next_ == NULL)
 691         return $ CYString(part_);
 692     return $ CYString($pool.strcat(next_->Replace(context, separator)->Value(), separator, part_->Word(), NULL));
 693 }
 694
 695 CYExpression *CYMultiply::Replace(CYContext &context) {
 696     CYInfix::Replace(context);
 697
 698     if (CYNumber *lhn = lhs_->Number(context))
 699         if (CYNumber *rhn = rhs_->Number(context))
 700             return $D(lhn->Value() * rhn->Value());
 701
 702     return this;
 703 }
 704
 705 namespace cy {
 706 namespace Syntax {
 707
 708 CYTarget *New::AddArgument(CYContext &context, CYExpression *value) {
 709     CYSetLast(arguments_) = $ CYArgument(value);
 710     return this;
 711 }
 712
 713 CYTarget *New::Replace(CYContext &context) {
 714     context.Replace(constructor_);
 715     arguments_->Replace(context);
 716     return this;
 717 }
 718
 719 } }
 720
 721 CYNumber *CYNull::Number(CYContext &context) {
 722     return $D(0);
 723 }
 724
 725 CYString *CYNull::String(CYContext &context) {
 726     return $S("null");
 727 }
 728
 729 CYNumber *CYNumber::Number(CYContext &context) {
 730     return this;
 731 }
 732
 733 CYString *CYNumber::String(CYContext &context) {
 734     // XXX: there is a precise algorithm for this
 735     return $S($pool.sprintf(24, "%.17g", Value()));
 736 }
 737
 738 CYExpression *CYNumber::PropertyName(CYContext &context) {
 739     return String(context);
 740 }
 741
 742 CYTarget *CYObject::Replace(CYContext &context, CYTarget *seed) {
 743     CYBuilder builder;
 744     if (properties_ != NULL)
 745         properties_ = properties_->ReplaceAll(context, builder, $ CYThis(), seed != this);
 746
 747     if (builder) {
 748         return $C1($M($ CYFunctionExpression(NULL, builder.bindings_->Parameter(context),
 749             builder.statements_
 750                 ->* $ CYReturn($ CYThis())
 751         ), $S("call")), seed, builder.bindings_->Argument(context));
 752     }
 753
 754     CYForEach (property, properties_)
 755         property->Replace(context);
 756     return seed;
 757 }
 758
 759 CYTarget *CYObject::Replace(CYContext &context) {
 760     return Replace(context, this);
 761 }
 762
 763 CYTarget *CYParenthetical::Replace(CYContext &context) {
 764     // XXX: return expression_;
 765     context.Replace(expression_);
 766     return this;
 767 }
 768
 769 CYExpression *CYPostfix::Replace(CYContext &context) {
 770     context.Replace(lhs_);
 771     return this;
 772 }
 773
 774 CYExpression *CYPrefix::Replace(CYContext &context) {
 775     context.Replace(rhs_);
 776     return this;
 777 }
 778
 779 CYProperty *CYProperty::ReplaceAll(CYContext &context, CYBuilder &builder, CYExpression *self, bool update) {
 780     update |= Update();
 781     if (update)
 782         Replace(context, builder, self, false);
 783     if (next_ != NULL)
 784         next_ = next_->ReplaceAll(context, builder, self, update);
 785     return update ? next_ : this;
 786 }
 787
 788 void CYProperty::Replace(CYContext &context, CYBuilder &builder, CYExpression *self, bool protect) {
 789     CYExpression *name(name_->PropertyName(context));
 790     if (name_->Computed()) {
 791         CYIdentifier *unique(context.Unique());
 792         builder.bindings_
 793             ->* $B1($B(unique, name));
 794         name = $V(unique);
 795     }
 796
 797     Replace(context, builder, self, name, protect);
 798 }
 799
 800 bool CYProperty::Update() const {
 801     return name_->Computed();
 802 }
 803
 804 void CYPropertyGetter::Replace(CYContext &context, CYBuilder &builder, CYExpression *self, CYExpression *name, bool protect) {
 805     CYIdentifier *unique(context.Unique());
 806     builder.bindings_
 807         ->* $B1($B(unique, CYSuperize(context, $ CYFunctionExpression(NULL, parameters_, code_))));
 808     builder.statements_
 809         ->* CYDefineProperty(self, name, true, !protect, $ CYPropertyValue($S("get"), $V(unique)));
 810 }
 811
 812 CYFunctionExpression *CYPropertyMethod::Constructor() {
 813     return name_->Constructor() ? $ CYFunctionExpression(NULL, parameters_, code_) : NULL;
 814 }
 815
 816 void CYPropertyMethod::Replace(CYContext &context, CYBuilder &builder, CYExpression *self, CYExpression *name, bool protect) {
 817     CYIdentifier *unique(context.Unique());
 818     builder.bindings_
 819         ->* $B1($B(unique, CYSuperize(context, $ CYFunctionExpression(NULL, parameters_, code_))));
 820     builder.statements_
 821         ->* (!protect ? $E($ CYAssign($M(self, name), $V(unique))) :
 822             CYDefineProperty(self, name, true, !protect, $ CYPropertyValue($S("value"), $V(unique), $ CYPropertyValue($S("writable"), $ CYTrue()))));
 823 }
 824
 825 bool CYPropertyMethod::Update() const {
 826     return true;
 827 }
 828
 829 void CYPropertySetter::Replace(CYContext &context, CYBuilder &builder, CYExpression *self, CYExpression *name, bool protect) {
 830     CYIdentifier *unique(context.Unique());
 831     builder.bindings_
 832         ->* $B1($B(unique, CYSuperize(context, $ CYFunctionExpression(NULL, parameters_, code_))));
 833     builder.statements_
 834         ->* CYDefineProperty(self, name, true, !protect, $ CYPropertyValue($S("set"), $V(unique)));
 835 }
 836
 837 void CYPropertyValue::Replace(CYContext &context, CYBuilder &builder, CYExpression *self, CYExpression *name, bool protect) {
 838     _assert(!protect);
 839     CYIdentifier *unique(context.Unique());
 840     builder.bindings_
 841         ->* $B1($B(unique, value_));
 842     builder.statements_
 843         ->* $E($ CYAssign($M(self, name), $V(unique)));
 844 }
 845
 846 void CYPropertyValue::Replace(CYContext &context) {
 847     context.Replace(value_);
 848 }
 849
 850 void CYScript::Replace(CYContext &context) {
 851     CYScope scope(false, context);
 852     context.scope_->Damage();
 853
 854     context.nextlocal_ = $ CYNonLocal();
 855     context.ReplaceAll(code_);
 856     context.NonLocal(code_);
 857
 858     scope.Close(context, code_);
 859
 860     unsigned offset(0);
 861
 862     for (std::vector<CYIdentifier *>::const_iterator i(context.replace_.begin()); i != context.replace_.end(); ++i) {
 863         const char *name;
 864         if (context.options_.verbose_)
 865             name = $pool.strcat("$", $pool.itoa(offset++), NULL);
 866         else {
 867             char id[8];
 868             id[7] = '\0';
 869
 870           id:
 871             unsigned position(7), local(offset++ + 1);
 872
 873             do {
 874                 unsigned index(local % (sizeof(MappingSet) - 1));
 875                 local /= sizeof(MappingSet) - 1;
 876                 id[--position] = MappingSet[index];
 877             } while (local != 0);
 878
 879             if (scope.Lookup(context, id + position) != NULL)
 880                 goto id;
 881             // XXX: at some point, this could become a keyword
 882
 883             name = $pool.strmemdup(id + position, 7 - position);
 884         }
 885
 886         CYIdentifier *identifier(*i);
 887         _assert(identifier->next_ == identifier);
 888         identifier->next_ = $I(name);
 889     }
 890 }
 891
 892 CYTarget *CYResolveMember::Replace(CYContext &context) {
 893     return $M($M(object_, $S("$cyr")), property_);
 894 }
 895
 896 CYStatement *CYReturn::Replace(CYContext &context) {
 897     if (context.nonlocal_ != NULL) {
 898         CYProperty *value(value_ == NULL ? NULL : $ CYPropertyValue($S("$cyv"), value_));
 899         return $ cy::Syntax::Throw($ CYObject(
 900             $ CYPropertyValue($S("$cyk"), $V(context.nonlocal_->Target(context)), value)
 901         ));
 902     }
 903
 904     context.Replace(value_);
 905     return this;
 906 }
 907
 908 CYTarget *CYRubyBlock::Replace(CYContext &context) {
 909     return lhs_->AddArgument(context, proc_->Replace(context));
 910 }
 911
 912 CYTarget *CYRubyBlock::AddArgument(CYContext &context, CYExpression *value) {
 913     return Replace(context)->AddArgument(context, value);
 914 }
 915
 916 CYTarget *CYRubyProc::Replace(CYContext &context) {
 917     CYFunctionExpression *function($ CYFunctionExpression(NULL, parameters_, code_));
 918     function = CYNonLocalize(context, function);
 919     function->implicit_ = true;
 920     return function;
 921 }
 922
 923 CYScope::CYScope(bool transparent, CYContext &context) :
 924     transparent_(transparent),
 925     parent_(context.scope_),
 926     damaged_(false),
 927     shadow_(NULL),
 928     internal_(NULL)
 929 {
 930     _assert(!transparent_ || parent_ != NULL);
 931     context.scope_ = this;
 932 }
 933
 934 void CYScope::Damage() {
 935     damaged_ = true;
 936     if (parent_ != NULL)
 937         parent_->Damage();
 938 }
 939
 940 CYIdentifierFlags *CYScope::Lookup(CYContext &context, const char *word) {
 941     CYForEach (i, internal_)
 942         if (strcmp(i->identifier_->Word(), word) == 0)
 943             return i;
 944     return NULL;
 945 }
 946
 947 CYIdentifierFlags *CYScope::Lookup(CYContext &context, CYIdentifier *identifier) {
 948     return Lookup(context, identifier->Word());
 949 }
 950
 951 CYIdentifierFlags *CYScope::Declare(CYContext &context, CYIdentifier *identifier, CYIdentifierKind kind) {
 952     _assert(identifier->next_ == NULL || identifier->next_ == identifier);
 953
 954     CYIdentifierFlags *existing(Lookup(context, identifier));
 955     if (existing == NULL)
 956         internal_ = $ CYIdentifierFlags(identifier, kind, internal_);
 957     ++internal_->count_;
 958     if (existing == NULL)
 959         return internal_;
 960
 961     if (kind == CYIdentifierGlobal);
 962     else if (existing->kind_ == CYIdentifierGlobal || existing->kind_ == CYIdentifierMagic)
 963         existing->kind_ = kind;
 964     else if (existing->kind_ == CYIdentifierLexical || kind == CYIdentifierLexical)
 965         _assert(false); // XXX: throw new SyntaxError()
 966
 967     return existing;
 968 }
 969
 970 void CYScope::Merge(CYContext &context, const CYIdentifierFlags *flags) {
 971     _assert(flags->identifier_->next_ == flags->identifier_);
 972     CYIdentifierFlags *existing(Declare(context, flags->identifier_, flags->kind_));
 973     flags->identifier_->next_ = existing->identifier_;
 974
 975     existing->count_ += flags->count_;
 976     if (existing->offset_ < flags->offset_)
 977         existing->offset_ = flags->offset_;
 978 }
 979
 980 void CYScope::Close(CYContext &context, CYStatement *&statements) {
 981     Close(context);
 982
 983     CYList<CYBindings> bindings;
 984
 985     CYForEach (i, internal_)
 986         if (i->kind_ == CYIdentifierVariable)
 987             bindings
 988                 ->* $ CYBindings($ CYBinding(i->identifier_));
 989
 990     if (bindings) {
 991         CYVar *var($ CYVar(bindings));
 992         var->SetNext(statements);
 993         statements = var;
 994     }
 995 }
 996
 997 void CYScope::Close(CYContext &context) {
 998     context.scope_ = parent_;
 999
1000     CYForEach (i, internal_) {
1001         _assert(i->identifier_->next_ == i->identifier_);
1002     switch (i->kind_) {
1003         case CYIdentifierArgument: {
1004             _assert(!transparent_);
1005         } break;
1006
1007         case CYIdentifierLexical: {
1008             if (!damaged_) {
1009                 CYIdentifier *replace(context.Unique());
1010                 replace->next_ = replace;
1011                 i->identifier_->next_ = replace;
1012                 i->identifier_ = replace;
1013             }
1014
1015             if (!transparent_)
1016                 i->kind_ = CYIdentifierVariable;
1017             else
1018                 parent_->Declare(context, i->identifier_, CYIdentifierVariable);
1019         } break;
1020
1021         case CYIdentifierVariable: {
1022             if (transparent_) {
1023                 parent_->Declare(context, i->identifier_, i->kind_);
1024                 i->kind_ = CYIdentifierGlobal;
1025             }
1026         } break;
1027     default:; } }
1028
1029     if (damaged_)
1030         return;
1031
1032     typedef std::multimap<unsigned, CYIdentifier *> CYIdentifierOffsetMap;
1033     CYIdentifierOffsetMap offsets;
1034
1035     CYForEach (i, internal_) {
1036         _assert(i->identifier_->next_ == i->identifier_);
1037     switch (i->kind_) {
1038         case CYIdentifierArgument:
1039         case CYIdentifierVariable:
1040             offsets.insert(CYIdentifierOffsetMap::value_type(i->offset_, i->identifier_));
1041         break;
1042     default:; } }
1043
1044     unsigned offset(0);
1045
1046     for (CYIdentifierOffsetMap::const_iterator i(offsets.begin()); i != offsets.end(); ++i) {
1047         if (offset < i->first)
1048             offset = i->first;
1049         CYIdentifier *identifier(i->second);
1050
1051         if (offset >= context.replace_.size())
1052             context.replace_.resize(offset + 1, NULL);
1053         CYIdentifier *&replace(context.replace_[offset++]);
1054
1055         if (replace == NULL)
1056             replace = identifier;
1057         else {
1058             _assert(replace->next_ == replace);
1059             identifier->next_ = replace;
1060         }
1061     }
1062
1063     if (parent_ == NULL)
1064         return;
1065
1066     CYForEach (i, internal_) {
1067     switch (i->kind_) {
1068         case CYIdentifierGlobal: {
1069             if (i->offset_ < offset)
1070                 i->offset_ = offset;
1071             parent_->Merge(context, i);
1072         } break;
1073     default:; } }
1074 }
1075
1076 CYTarget *CYSubscriptMember::Replace(CYContext &context) {
1077     return $C1($M(object_, $S("$cyg")), property_);
1078 }
1079
1080 CYElementValue *CYSpan::Replace(CYContext &context) { $T(NULL)
1081     return $ CYElementValue(expression_, $ CYElementValue(string_, next_->Replace(context)));
1082 }
1083
1084 CYStatement *CYStatement::Return() {
1085     return this;
1086 }
1087
1088 CYString *CYString::Concat(CYContext &context, CYString *rhs) const {
1089     size_t size(size_ + rhs->size_);
1090     char *value($ char[size + 1]);
1091     memcpy(value, value_, size_);
1092     memcpy(value + size_, rhs->value_, rhs->size_);
1093     value[size] = '\0';
1094     return $S(value, size);
1095 }
1096
1097 CYNumber *CYString::Number(CYContext &context) {
1098     // XXX: there is a precise algorithm for this
1099     return NULL;
1100 }
1101
1102 CYExpression *CYString::PropertyName(CYContext &context) {
1103     return this;
1104 }
1105
1106 CYString *CYString::String(CYContext &context) {
1107     return this;
1108 }
1109
1110 CYStatement *CYStructDefinition::Replace(CYContext &context) {
1111     CYTarget *target(tail_->Replace(context));
1112     if (name_ != NULL)
1113         target = $C1($M(target, $S("withName")), $S(name_->Word()));
1114     return $ CYLexical(false, $B1($B($I($pool.strcat(name_->Word(), "$cy", NULL)), target)));
1115 }
1116
1117 CYTarget *CYStructTail::Replace(CYContext &context) {
1118     CYList<CYElementValue> types;
1119     CYList<CYElementValue> names;
1120
1121     CYForEach (field, fields_) {
1122         CYTypedIdentifier *typed(field->typed_);
1123         types->*$ CYElementValue(typed->Replace(context));
1124
1125         CYExpression *name;
1126         if (typed->identifier_ == NULL)
1127             name = NULL;
1128         else
1129             name = $S(typed->identifier_->Word());
1130         names->*$ CYElementValue(name);
1131     }
1132
1133     return $N2($V("Type"), $ CYArray(types), $ CYArray(names));
1134 }
1135
1136 CYTarget *CYSuperAccess::Replace(CYContext &context) {
1137     return $C1($M($M($M($V(context.super_), $S("prototype")), property_), $S("bind")), $ CYThis());
1138 }
1139
1140 CYTarget *CYSuperCall::Replace(CYContext &context) {
1141     return $C($C1($M($V(context.super_), $S("bind")), $ CYThis()), arguments_);
1142 }
1143
1144 CYTarget *CYSymbol::Replace(CYContext &context) {
1145     return $C1($M($V("Symbol"), $S("for")), $S(name_));
1146 }
1147
1148 CYStatement *CYSwitch::Replace(CYContext &context) {
1149     context.Replace(value_);
1150     clauses_->Replace(context);
1151     return this;
1152 }
1153
1154 CYStatement *CYTarget::Initialize(CYContext &context, CYExpression *value) {
1155     if (value == NULL)
1156         return NULL;
1157     return $E($ CYAssign(this, value));
1158 }
1159
1160 CYTarget *CYTemplate::Replace(CYContext &context) {
1161     return $C2($M($M($M($V("String"), $S("prototype")), $S("concat")), $S("apply")), $S(""), $ CYArray($ CYElementValue(string_, spans_->Replace(context))));
1162 }
1163
1164 CYTarget *CYThis::Replace(CYContext &context) {
1165     if (context.this_ != NULL)
1166         return $V(context.this_->Identifier(context));
1167     return this;
1168 }
1169
1170 namespace cy {
1171 namespace Syntax {
1172
1173 CYStatement *Throw::Replace(CYContext &context) {
1174     context.Replace(value_);
1175     return this;
1176 }
1177
1178 } }
1179
1180 CYTarget *CYTrivial::Replace(CYContext &context) {
1181     return this;
1182 }
1183
1184 CYNumber *CYTrue::Number(CYContext &context) {
1185     return $D(1);
1186 }
1187
1188 CYString *CYTrue::String(CYContext &context) {
1189     return $S("true");
1190 }
1191
1192 namespace cy {
1193 namespace Syntax {
1194
1195 CYStatement *Try::Replace(CYContext &context) {
1196     CYScope scope(true, context);
1197     context.ReplaceAll(code_);
1198     scope.Close(context);
1199
1200     catch_->Replace(context);
1201     finally_->Replace(context);
1202     return this;
1203 }
1204
1205 } }
1206
1207 CYTarget *CYTypeArrayOf::Replace_(CYContext &context, CYTarget *type) {
1208     return next_->Replace(context, $ CYCall($ CYDirectMember(type, $ CYString("arrayOf")), $ CYArgument(size_)));
1209 }
1210
1211 CYTarget *CYTypeBlockWith::Replace_(CYContext &context, CYTarget *type) {
1212     return next_->Replace(context, $ CYCall($ CYDirectMember(type, $ CYString("blockWith")), parameters_->Argument(context)));
1213 }
1214
1215 CYTarget *CYTypeCharacter::Replace(CYContext &context) {
1216     switch (signing_) {
1217         case CYTypeNeutral: return $V("char");
1218         case CYTypeSigned: return $V("schar");
1219         case CYTypeUnsigned: return $V("uchar");
1220         default: _assert(false);
1221     }
1222 }
1223
1224 CYTarget *CYTypeConstant::Replace_(CYContext &context, CYTarget *type) {
1225     return next_->Replace(context, $ CYCall($ CYDirectMember(type, $ CYString("constant"))));
1226 }
1227
1228 CYStatement *CYTypeDefinition::Replace(CYContext &context) {
1229     CYIdentifier *identifier(typed_->identifier_);
1230     typed_->identifier_ = NULL;
1231     return $ CYLexical(false, $B1($B(identifier, $ CYTypeExpression(typed_))));
1232 }
1233
1234 CYTarget *CYTypeError::Replace(CYContext &context) {
1235     _assert(false);
1236     return NULL;
1237 }
1238
1239 CYTarget *CYTypeExpression::Replace(CYContext &context) {
1240     return typed_->Replace(context);
1241 }
1242
1243 CYTarget *CYTypeIntegral::Replace(CYContext &context) {
1244     bool u(signing_ == CYTypeUnsigned);
1245     switch (length_) {
1246         case 0: return $V(u ? "ushort" : "short");
1247         case 1: return $V(u ? "uint" : "int");
1248         case 2: return $V(u ? "ulong" : "long");
1249         case 3: return $V(u ? "ulonglong" : "longlong");
1250         default: _assert(false);
1251     }
1252 }
1253
1254 CYTarget *CYTypeModifier::Replace(CYContext &context, CYTarget *type) { $T(type)
1255     return Replace_(context, type);
1256 }
1257
1258 CYTarget *CYTypeFunctionWith::Replace_(CYContext &context, CYTarget *type) {
1259     CYList<CYArgument> arguments(parameters_->Argument(context));
1260     if (variadic_)
1261         arguments->*$C_($ CYNull());
1262     return next_->Replace(context, $ CYCall($ CYDirectMember(type, $ CYString("functionWith")), arguments));
1263 }
1264
1265 CYTarget *CYTypePointerTo::Replace_(CYContext &context, CYTarget *type) {
1266     return next_->Replace(context, $ CYCall($ CYDirectMember(type, $ CYString("pointerTo"))));
1267 }
1268
1269 CYTarget *CYTypeReference::Replace(CYContext &context) {
1270     return $V($pool.strcat(name_->Word(), "$cy", NULL));
1271 }
1272
1273 CYTarget *CYTypeStruct::Replace(CYContext &context) {
1274     CYTarget *target(tail_->Replace(context));
1275     if (name_ != NULL)
1276         target = $C1($M(target, $S("withName")), $S(name_->Word()));
1277     return target;
1278 }
1279
1280 CYTarget *CYTypeVariable::Replace(CYContext &context) {
1281     return $V(name_);
1282 }
1283
1284 CYTarget *CYTypeVoid::Replace(CYContext &context) {
1285     return $N1($V("Type"), $ CYString("v"));
1286 }
1287
1288 CYTarget *CYTypeVolatile::Replace_(CYContext &context, CYTarget *type) {
1289     return next_->Replace(context, $ CYCall($ CYDirectMember(type, $ CYString("volatile"))));
1290 }
1291
1292 CYTarget *CYTypedIdentifier::Replace(CYContext &context) {
1293     return modifier_->Replace(context, specifier_->Replace(context));
1294 }
1295
1296 CYTypeFunctionWith *CYTypedIdentifier::Function() {
1297     CYTypeModifier *&modifier(CYGetLast(modifier_));
1298     if (modifier == NULL)
1299         return NULL;
1300
1301     CYTypeFunctionWith *function(modifier->Function());
1302     if (function == NULL)
1303         return NULL;
1304
1305     modifier = NULL;
1306     return function;
1307 }
1308
1309 CYArgument *CYTypedParameter::Argument(CYContext &context) { $T(NULL)
1310     return $ CYArgument(typed_->Replace(context), next_->Argument(context));
1311 }
1312
1313 CYFunctionParameter *CYTypedParameter::Parameters(CYContext &context) { $T(NULL)
1314     return $ CYFunctionParameter($ CYBinding(typed_->identifier_ ?: context.Unique()), next_->Parameters(context));
1315 }
1316
1317 CYExpression *CYTypedParameter::TypeSignature(CYContext &context, CYExpression *prefix) { $T(prefix)
1318     return next_->TypeSignature(context, $ CYAdd(prefix, typed_->Replace(context)));
1319 }
1320
1321 CYForInitializer *CYVar::Replace(CYContext &context) {
1322     if (CYExpression *expression = bindings_->Replace(context, CYIdentifierVariable))
1323         return $E(expression);
1324     return $ CYEmpty();
1325 }
1326
1327 CYTarget *CYVariable::Replace(CYContext &context) {
1328     name_ = name_->Replace(context, CYIdentifierGlobal);
1329     return this;
1330 }
1331
1332 CYFunctionParameter *CYVariable::Parameter() const {
1333     return $ CYFunctionParameter($ CYBinding(name_));
1334 }
1335
1336 CYStatement *CYWhile::Replace(CYContext &context) {
1337     context.Replace(test_);
1338     context.ReplaceAll(code_);
1339     return this;
1340 }
1341
1342 CYStatement *CYWith::Replace(CYContext &context) {
1343     context.Replace(scope_);
1344     CYScope scope(true, context);
1345     scope.Damage();
1346     context.ReplaceAll(code_);
1347     scope.Close(context);
1348     return this;
1349 }
1350
1351 CYExpression *CYWord::PropertyName(CYContext &context) {
1352     return $S(this);
1353 }