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_->name_ = name_;
 186     tail_->constructor_ = CYSuperize(context, tail_->constructor_);
 187
 188     context.super_ = old;
 189
 190     return $C1($ CYFunctionExpression(NULL, $P($B(super)), $$
 191         ->* $ CYVar($B1($B(constructor, tail_->constructor_)))
 192         ->* $ CYVar($B1($B(prototype, $ CYFunctionExpression(NULL, NULL, NULL))))
 193         ->* $E($ CYAssign($M($V(prototype), $S("prototype")), $M($V(super), $S("prototype"))))
 194         ->* $E($ CYAssign($V(prototype), $N($V(prototype))))
 195         ->* CYDefineProperty($V(prototype), $S("constructor"), false, false, $ CYPropertyValue($S("value"), $V(constructor)))
 196         ->* $ CYVar(builder.bindings_)
 197         ->* builder.statements_
 198         ->* CYDefineProperty($V(constructor), $S("prototype"), false, false, $ CYPropertyValue($S("value"), $V(prototype)))
 199         ->* $ CYReturn($V(constructor))
 200     ), tail_->extends_ ?: $V($I("Object")));
 201 }
 202
 203 CYStatement *CYClassStatement::Replace(CYContext &context) {
 204     return $ CYVar($B1($B(name_, $ CYClassExpression(name_, tail_))));
 205 }
 206
 207 void CYClause::Replace(CYContext &context) { $T()
 208     context.Replace(value_);
 209     context.ReplaceAll(code_);
 210     next_->Replace(context);
 211 }
 212
 213 CYExpression *CYCompound::Replace(CYContext &context) {
 214     context.Replace(expression_);
 215     context.Replace(next_);
 216
 217     if (CYCompound *compound = dynamic_cast<CYCompound *>(expression_)) {
 218         expression_ = compound->expression_;
 219         compound->expression_ = compound->next_;
 220         compound->next_ = next_;
 221         next_ = compound;
 222     }
 223
 224     return this;
 225 }
 226
 227 CYFunctionParameter *CYCompound::Parameter() const {
 228     CYFunctionParameter *next(next_->Parameter());
 229     if (next == NULL)
 230         return NULL;
 231
 232     CYFunctionParameter *parameter(expression_->Parameter());
 233     if (parameter == NULL)
 234         return NULL;
 235
 236     parameter->SetNext(next);
 237     return parameter;
 238 }
 239
 240 CYFunctionParameter *CYComprehension::Parameters(CYContext &context) const { $T(NULL)
 241     CYFunctionParameter *next(next_->Parameters(context));
 242     if (CYFunctionParameter *parameter = Parameter(context)) {
 243         parameter->SetNext(next);
 244         return parameter;
 245     } else
 246         return next;
 247 }
 248
 249 CYStatement *CYComprehension::Replace(CYContext &context, CYStatement *statement) const {
 250     return next_ == NULL ? statement : next_->Replace(context, statement);
 251 }
 252
 253 CYExpression *CYComputed::PropertyName(CYContext &context) {
 254     return expression_;
 255 }
 256
 257 CYExpression *CYCondition::Replace(CYContext &context) {
 258     context.Replace(test_);
 259     context.Replace(true_);
 260     context.Replace(false_);
 261     return this;
 262 }
 263
 264 void CYContext::NonLocal(CYStatement *&statements) {
 265     CYContext &context(*this);
 266
 267     if (nextlocal_ != NULL && nextlocal_->identifier_ != NULL) {
 268         CYIdentifier *cye($I("$cye")->Replace(context, CYIdentifierGlobal));
 269         CYIdentifier *unique(nextlocal_->identifier_->Replace(context, CYIdentifierGlobal));
 270
 271         CYStatement *declare(
 272             $ CYVar($B1($B(unique, $ CYObject()))));
 273
 274         cy::Syntax::Catch *rescue(
 275             $ cy::Syntax::Catch(cye, $$
 276                 ->* $ CYIf($ CYIdentical($M($V(cye), $S("$cyk")), $V(unique)), $$
 277                     ->* $ CYReturn($M($V(cye), $S("$cyv"))))
 278                 ->* $ cy::Syntax::Throw($V(cye))));
 279
 280         context.Replace(declare);
 281         rescue->Replace(context);
 282
 283         statements = $$
 284             ->* declare
 285             ->* $ cy::Syntax::Try(statements, rescue, NULL);
 286     }
 287 }
 288
 289 CYIdentifier *CYContext::Unique() {
 290     return $ CYIdentifier($pool.strcat("$cy", $pool.itoa(unique_++), NULL));
 291 }
 292
 293 CYStatement *CYContinue::Replace(CYContext &context) {
 294     return this;
 295 }
 296
 297 CYStatement *CYDebugger::Replace(CYContext &context) {
 298     return this;
 299 }
 300
 301 CYTarget *CYBinding::Target(CYContext &context) {
 302     return $V(identifier_);
 303 }
 304
 305 CYAssignment *CYBinding::Replace(CYContext &context, CYIdentifierKind kind) {
 306     identifier_ = identifier_->Replace(context, kind);
 307
 308     if (initializer_ == NULL)
 309         return NULL;
 310
 311     CYAssignment *value($ CYAssign(Target(context), initializer_));
 312     initializer_ = NULL;
 313     return value;
 314 }
 315
 316 CYExpression *CYBindings::Replace(CYContext &context, CYIdentifierKind kind) { $T(NULL)
 317     CYAssignment *assignment(binding_->Replace(context, kind));
 318     CYExpression *compound(next_->Replace(context, kind));
 319
 320     if (assignment != NULL)
 321         if (compound == NULL)
 322             compound = assignment;
 323         else
 324             compound = $ CYCompound(assignment, compound);
 325     return compound;
 326 }
 327
 328 CYFunctionParameter *CYBindings::Parameter(CYContext &context) { $T(NULL)
 329     return $ CYFunctionParameter($ CYBinding(binding_->identifier_), next_->Parameter(context));
 330 }
 331
 332 CYArgument *CYBindings::Argument(CYContext &context) { $T(NULL)
 333     return $ CYArgument(binding_->initializer_, next_->Argument(context));
 334 }
 335
 336 CYTarget *CYDirectMember::Replace(CYContext &context) {
 337     context.Replace(object_);
 338     context.Replace(property_);
 339     return this;
 340 }
 341
 342 CYStatement *CYDoWhile::Replace(CYContext &context) {
 343     context.Replace(test_);
 344     context.ReplaceAll(code_);
 345     return this;
 346 }
 347
 348 void CYElementSpread::Replace(CYContext &context) {
 349     context.Replace(value_);
 350 }
 351
 352 void CYElementValue::Replace(CYContext &context) {
 353     context.Replace(value_);
 354 }
 355
 356 CYForInitializer *CYEmpty::Replace(CYContext &context) {
 357     return NULL;
 358 }
 359
 360 CYTarget *CYEncodedType::Replace(CYContext &context) {
 361     return typed_->Replace(context);
 362 }
 363
 364 CYTarget *CYEval::Replace(CYContext &context) {
 365     context.scope_->Damage();
 366     if (arguments_ != NULL)
 367         arguments_->value_ = $C1($M($V("Cycript"), $S("compile")), arguments_->value_);
 368     return $C($V("eval"), arguments_);
 369 }
 370
 371 CYStatement *CYExpress::Return() {
 372     return $ CYReturn(expression_);
 373 }
 374
 375 CYForInitializer *CYExpress::Replace(CYContext &context) {
 376     context.Replace(expression_);
 377     return this;
 378 }
 379
 380 CYTarget *CYExpression::AddArgument(CYContext &context, CYExpression *value) {
 381     return $C1(this, value);
 382 }
 383
 384 CYFunctionParameter *CYExpression::Parameter() const {
 385     return NULL;
 386 }
 387
 388 CYTarget *CYExtend::Replace(CYContext &context) {
 389     return object_.Replace(context, lhs_);
 390 }
 391
 392 CYStatement *CYExternalDefinition::Replace(CYContext &context) {
 393     return $E($ CYAssign($V(name_), $ CYExternalExpression(abi_, type_, name_)));
 394 }
 395
 396 CYTarget *CYExternalExpression::Replace(CYContext &context) {
 397     return $C1(type_->Replace(context), $C2($V("dlsym"), $V("RTLD_DEFAULT"), name_->PropertyName(context)));
 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     CYScope scope(true, context);
 416     context.ReplaceAll(code_);
 417     scope.Close(context);
 418 }
 419
 420 CYStatement *CYFor::Replace(CYContext &context) {
 421     CYScope outer(true, context);
 422     context.Replace(initializer_);
 423
 424     context.Replace(test_);
 425
 426     {
 427         CYScope inner(true, context);
 428         context.ReplaceAll(code_);
 429         inner.Close(context);
 430     }
 431
 432     context.Replace(increment_);
 433
 434     outer.Close(context);
 435     return this;
 436 }
 437
 438 CYStatement *CYForLexical::Initialize(CYContext &context, CYExpression *value) {
 439     if (value == NULL) {
 440         if (binding_->initializer_ == NULL)
 441             return NULL;
 442         value = binding_->initializer_;
 443     }
 444
 445     return $ CYLexical(constant_, $B1($ CYBinding(binding_->identifier_, value)));
 446 }
 447
 448 CYTarget *CYForLexical::Replace(CYContext &context) {
 449     _assert(binding_->Replace(context, CYIdentifierLexical) == NULL);
 450     return binding_->Target(context);
 451 }
 452
 453 CYStatement *CYForIn::Replace(CYContext &context) {
 454     CYScope scope(true, context);
 455     context.Replace(initializer_);
 456     context.Replace(iterable_);
 457     context.ReplaceAll(code_);
 458     scope.Close(context);
 459     return this;
 460 }
 461
 462 CYStatement *CYForInitialized::Replace(CYContext &context) {
 463     CYAssignment *assignment(binding_->Replace(context, CYIdentifierVariable));
 464     return $ CYBlock($$
 465         ->* (assignment == NULL ? NULL : $ CYExpress(assignment))
 466         ->* $ CYForIn(binding_->Target(context), iterable_, code_));
 467 }
 468
 469 CYFunctionParameter *CYForInComprehension::Parameter(CYContext &context) const {
 470     return $ CYFunctionParameter(binding_);
 471 }
 472
 473 CYStatement *CYForInComprehension::Replace(CYContext &context, CYStatement *statement) const {
 474     return $ CYForIn(binding_->Target(context), iterable_, CYComprehension::Replace(context, statement));
 475 }
 476
 477 CYStatement *CYForOf::Replace(CYContext &context) {
 478     CYIdentifier *item(context.Unique()), *list(context.Unique());
 479
 480     return $ CYBlock($$
 481         ->* initializer_->Initialize(context, NULL)
 482         ->* $ CYLexical(false, $B2($B(list, iterable_), $B(item)))
 483         ->* $ CYForIn($V(item), $V(list), $ CYBlock($$
 484             ->* initializer_->Initialize(context, $M($V(list), $V(item)))
 485             ->* code_
 486     )));
 487 }
 488
 489 CYFunctionParameter *CYForOfComprehension::Parameter(CYContext &context) const {
 490     return $ CYFunctionParameter(binding_);
 491 }
 492
 493 CYStatement *CYForOfComprehension::Replace(CYContext &context, CYStatement *statement) const {
 494     CYIdentifier *cys(context.Unique());
 495
 496     return $ CYBlock($$
 497         ->* $ CYLexical(false, $B1($B(cys, iterable_)))
 498         ->* $ CYForIn(binding_->Target(context), $V(cys), $ CYBlock($$
 499             ->* $E($ CYAssign(binding_->Target(context), $M($V(cys), binding_->Target(context))))
 500             ->* CYComprehension::Replace(context, statement)
 501     )));
 502 }
 503
 504 CYStatement *CYForVariable::Initialize(CYContext &context, CYExpression *value) {
 505     if (value == NULL) {
 506         if (binding_->initializer_ == NULL)
 507             return NULL;
 508         value = binding_->initializer_;
 509     }
 510
 511     return $ CYVar($B1($ CYBinding(binding_->identifier_, value)));
 512 }
 513
 514 CYTarget *CYForVariable::Replace(CYContext &context) {
 515     _assert(binding_->Replace(context, CYIdentifierVariable) == NULL);
 516     return binding_->Target(context);
 517 }
 518
 519 // XXX: this is evil evil black magic. don't ask, don't tell... don't believe!
 520 #define MappingSet "0etnirsoalfucdphmgyvbxTwSNECAFjDLkMOIBPqzRH$_WXUVGYKQJZ"
 521 //#define MappingSet "0abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ$_"
 522
 523 void CYFunction::Replace(CYContext &context) {
 524     CYThisScope *_this(context.this_);
 525     context.this_ = &this_;
 526     context.this_ = CYGetLast(context.this_);
 527
 528     CYIdentifier *super(context.super_);
 529     context.super_ = super_;
 530
 531     CYNonLocal *nonlocal(context.nonlocal_);
 532     CYNonLocal *nextlocal(context.nextlocal_);
 533
 534     bool localize;
 535     if (nonlocal_ != NULL) {
 536         localize = false;
 537         context.nonlocal_ = nonlocal_;
 538     } else {
 539         localize = true;
 540         nonlocal_ = $ CYNonLocal();
 541         context.nextlocal_ = nonlocal_;
 542     }
 543
 544     CYScope scope(!localize, context);
 545
 546     $I("arguments")->Replace(context, CYIdentifierMagic);
 547
 548     parameters_->Replace(context, code_);
 549
 550     context.ReplaceAll(code_);
 551
 552     if (implicit_)
 553         CYImplicitReturn(code_);
 554
 555     if (CYIdentifier *identifier = this_.identifier_) {
 556         context.scope_->Declare(context, identifier, CYIdentifierVariable);
 557         code_ = $$
 558             ->* $E($ CYAssign($V(identifier), $ CYThis()))
 559             ->* code_;
 560     }
 561
 562     if (localize)
 563         context.NonLocal(code_);
 564
 565     context.nextlocal_ = nextlocal;
 566     context.nonlocal_ = nonlocal;
 567
 568     context.super_ = super;
 569     context.this_ = _this;
 570
 571     scope.Close(context, code_);
 572 }
 573
 574 CYTarget *CYFunctionExpression::Replace(CYContext &context) {
 575     CYScope scope(false, context);
 576     if (name_ != NULL)
 577         name_ = name_->Replace(context, CYIdentifierOther);
 578
 579     CYFunction::Replace(context);
 580     scope.Close(context);
 581     return this;
 582 }
 583
 584 void CYFunctionParameter::Replace(CYContext &context, CYStatement *&statements) { $T()
 585     CYAssignment *assignment(binding_->Replace(context, CYIdentifierArgument));
 586
 587     next_->Replace(context, statements);
 588
 589     if (assignment != NULL)
 590         statements = $$
 591             ->* $ CYIf($ CYIdentical($ CYTypeOf(binding_->Target(context)), $S("undefined")), $$
 592                 ->* $E(assignment))
 593             ->* statements;
 594 }
 595
 596 CYStatement *CYFunctionStatement::Replace(CYContext &context) {
 597     name_ = name_->Replace(context, CYIdentifierOther);
 598     CYFunction::Replace(context);
 599     return this;
 600 }
 601
 602 CYIdentifier *CYIdentifier::Replace(CYContext &context, CYIdentifierKind kind) {
 603     if (next_ == this)
 604         return this;
 605     if (next_ != NULL)
 606         return next_->Replace(context, kind);
 607     next_ = context.scope_->Declare(context, this, kind)->identifier_;
 608     return next_;
 609 }
 610
 611 CYStatement *CYIf::Return() {
 612     CYImplicitReturn(true_);
 613     CYImplicitReturn(false_);
 614     return this;
 615 }
 616
 617 CYStatement *CYIf::Replace(CYContext &context) {
 618     context.Replace(test_);
 619     context.ReplaceAll(true_);
 620     context.ReplaceAll(false_);
 621     return this;
 622 }
 623
 624 CYFunctionParameter *CYIfComprehension::Parameter(CYContext &context) const {
 625     return NULL;
 626 }
 627
 628 CYStatement *CYIfComprehension::Replace(CYContext &context, CYStatement *statement) const {
 629     return $ CYIf(test_, CYComprehension::Replace(context, statement));
 630 }
 631
 632 CYStatement *CYImport::Replace(CYContext &context) {
 633     return $ CYVar($B1($B($I(module_->part_->Word()), $C1($V("require"), module_->Replace(context, "/")))));
 634 }
 635
 636 CYStatement *CYImportDeclaration::Replace(CYContext &context) {
 637     CYIdentifier *module(context.Unique());
 638
 639     CYList<CYStatement> statements;
 640     CYForEach (specifier, specifiers_)
 641         statements->*specifier->Replace(context, module);
 642
 643     return $ CYBlock($$
 644         ->* $ CYLexical(false, $B1($B(module, $C1($V("require"), module_))))
 645         ->* statements);
 646 }
 647
 648 CYStatement *CYImportSpecifier::Replace(CYContext &context, CYIdentifier *module) {
 649     binding_ = binding_->Replace(context, CYIdentifierLexical);
 650
 651     CYExpression *import($V(module));
 652     if (name_ != NULL)
 653         import = $M(import, $S(name_));
 654     return $E($ CYAssign($V(binding_), import));
 655 }
 656
 657 CYTarget *CYIndirect::Replace(CYContext &context) {
 658     return $M(rhs_, $S("$cyi"));
 659 }
 660
 661 CYTarget *CYIndirectMember::Replace(CYContext &context) {
 662     return $M($ CYIndirect(object_), property_);
 663 }
 664
 665 CYExpression *CYInfix::Replace(CYContext &context) {
 666     context.Replace(lhs_);
 667     context.Replace(rhs_);
 668     return this;
 669 }
 670
 671 CYStatement *CYLabel::Replace(CYContext &context) {
 672     context.Replace(statement_);
 673     return this;
 674 }
 675
 676 CYTarget *CYLambda::Replace(CYContext &context) {
 677     return $N2($V("Functor"), $ CYFunctionExpression(NULL, parameters_->Parameters(context), code_), parameters_->TypeSignature(context, typed_->Replace(context)));
 678 }
 679
 680 CYForInitializer *CYLexical::Replace(CYContext &context) {
 681     if (CYExpression *expression = bindings_->Replace(context, CYIdentifierLexical))
 682         return $E(expression);
 683     return $ CYEmpty();
 684 }
 685
 686 CYFunctionExpression *CYMethod::Constructor() {
 687     return NULL;
 688 }
 689
 690 void CYMethod::Replace(CYContext &context) {
 691     CYFunction::Replace(context);
 692 }
 693
 694 CYString *CYModule::Replace(CYContext &context, const char *separator) const {
 695     if (next_ == NULL)
 696         return $ CYString(part_);
 697     return $ CYString($pool.strcat(next_->Replace(context, separator)->Value(), separator, part_->Word(), NULL));
 698 }
 699
 700 CYExpression *CYMultiply::Replace(CYContext &context) {
 701     CYInfix::Replace(context);
 702
 703     if (CYNumber *lhn = lhs_->Number(context))
 704         if (CYNumber *rhn = rhs_->Number(context))
 705             return $D(lhn->Value() * rhn->Value());
 706
 707     return this;
 708 }
 709
 710 namespace cy {
 711 namespace Syntax {
 712
 713 CYTarget *New::AddArgument(CYContext &context, CYExpression *value) {
 714     CYSetLast(arguments_) = $ CYArgument(value);
 715     return this;
 716 }
 717
 718 CYTarget *New::Replace(CYContext &context) {
 719     context.Replace(constructor_);
 720     arguments_->Replace(context);
 721     return this;
 722 }
 723
 724 } }
 725
 726 CYNumber *CYNull::Number(CYContext &context) {
 727     return $D(0);
 728 }
 729
 730 CYString *CYNull::String(CYContext &context) {
 731     return $S("null");
 732 }
 733
 734 CYNumber *CYNumber::Number(CYContext &context) {
 735     return this;
 736 }
 737
 738 CYString *CYNumber::String(CYContext &context) {
 739     // XXX: there is a precise algorithm for this
 740     return $S($pool.sprintf(24, "%.17g", Value()));
 741 }
 742
 743 CYExpression *CYNumber::PropertyName(CYContext &context) {
 744     return String(context);
 745 }
 746
 747 CYTarget *CYObject::Replace(CYContext &context, CYTarget *seed) {
 748     CYBuilder builder;
 749     if (properties_ != NULL)
 750         properties_ = properties_->ReplaceAll(context, builder, $ CYThis(), seed != this);
 751
 752     if (builder) {
 753         return $C1($M($ CYFunctionExpression(NULL, builder.bindings_->Parameter(context),
 754             builder.statements_
 755                 ->* $ CYReturn($ CYThis())
 756         ), $S("call")), seed, builder.bindings_->Argument(context));
 757     }
 758
 759     CYForEach (property, properties_)
 760         property->Replace(context);
 761     return seed;
 762 }
 763
 764 CYTarget *CYObject::Replace(CYContext &context) {
 765     return Replace(context, this);
 766 }
 767
 768 CYTarget *CYParenthetical::Replace(CYContext &context) {
 769     // XXX: return expression_;
 770     context.Replace(expression_);
 771     return this;
 772 }
 773
 774 CYExpression *CYPostfix::Replace(CYContext &context) {
 775     context.Replace(lhs_);
 776     return this;
 777 }
 778
 779 CYExpression *CYPrefix::Replace(CYContext &context) {
 780     context.Replace(rhs_);
 781     return this;
 782 }
 783
 784 CYProperty *CYProperty::ReplaceAll(CYContext &context, CYBuilder &builder, CYExpression *self, bool update) {
 785     update |= Update();
 786     if (update)
 787         Replace(context, builder, self, false);
 788     if (next_ != NULL)
 789         next_ = next_->ReplaceAll(context, builder, self, update);
 790     return update ? next_ : this;
 791 }
 792
 793 void CYProperty::Replace(CYContext &context, CYBuilder &builder, CYExpression *self, bool protect) {
 794     CYExpression *name(name_->PropertyName(context));
 795     if (name_->Computed()) {
 796         CYIdentifier *unique(context.Unique());
 797         builder.bindings_
 798             ->* $B1($B(unique, name));
 799         name = $V(unique);
 800     }
 801
 802     Replace(context, builder, self, name, protect);
 803 }
 804
 805 bool CYProperty::Update() const {
 806     return name_->Computed();
 807 }
 808
 809 void CYPropertyGetter::Replace(CYContext &context, CYBuilder &builder, CYExpression *self, CYExpression *name, bool protect) {
 810     CYIdentifier *unique(context.Unique());
 811     builder.bindings_
 812         ->* $B1($B(unique, CYSuperize(context, $ CYFunctionExpression(NULL, parameters_, code_))));
 813     builder.statements_
 814         ->* CYDefineProperty(self, name, true, !protect, $ CYPropertyValue($S("get"), $V(unique)));
 815 }
 816
 817 CYFunctionExpression *CYPropertyMethod::Constructor() {
 818     return name_->Constructor() ? $ CYFunctionExpression(NULL, parameters_, code_) : NULL;
 819 }
 820
 821 void CYPropertyMethod::Replace(CYContext &context, CYBuilder &builder, CYExpression *self, CYExpression *name, bool protect) {
 822     CYIdentifier *unique(context.Unique());
 823     builder.bindings_
 824         ->* $B1($B(unique, CYSuperize(context, $ CYFunctionExpression(NULL, parameters_, code_))));
 825     builder.statements_
 826         ->* (!protect ? $E($ CYAssign($M(self, name), $V(unique))) :
 827             CYDefineProperty(self, name, true, !protect, $ CYPropertyValue($S("value"), $V(unique), $ CYPropertyValue($S("writable"), $ CYTrue()))));
 828 }
 829
 830 bool CYPropertyMethod::Update() const {
 831     return true;
 832 }
 833
 834 void CYPropertySetter::Replace(CYContext &context, CYBuilder &builder, CYExpression *self, CYExpression *name, bool protect) {
 835     CYIdentifier *unique(context.Unique());
 836     builder.bindings_
 837         ->* $B1($B(unique, CYSuperize(context, $ CYFunctionExpression(NULL, parameters_, code_))));
 838     builder.statements_
 839         ->* CYDefineProperty(self, name, true, !protect, $ CYPropertyValue($S("set"), $V(unique)));
 840 }
 841
 842 void CYPropertyValue::Replace(CYContext &context, CYBuilder &builder, CYExpression *self, CYExpression *name, bool protect) {
 843     _assert(!protect);
 844     CYIdentifier *unique(context.Unique());
 845     builder.bindings_
 846         ->* $B1($B(unique, value_));
 847     builder.statements_
 848         ->* $E($ CYAssign($M(self, name), $V(unique)));
 849 }
 850
 851 void CYPropertyValue::Replace(CYContext &context) {
 852     context.Replace(value_);
 853 }
 854
 855 void CYScript::Replace(CYContext &context) {
 856     CYScope scope(false, context);
 857     context.scope_->Damage();
 858
 859     context.nextlocal_ = $ CYNonLocal();
 860     context.ReplaceAll(code_);
 861     context.NonLocal(code_);
 862
 863     scope.Close(context, code_);
 864
 865     unsigned offset(0);
 866
 867     for (std::vector<CYIdentifier *>::const_iterator i(context.replace_.begin()); i != context.replace_.end(); ++i) {
 868         const char *name;
 869         if (context.options_.verbose_)
 870             name = $pool.strcat("$", $pool.itoa(offset++), NULL);
 871         else {
 872             char id[8];
 873             id[7] = '\0';
 874
 875           id:
 876             unsigned position(7), local(offset++ + 1);
 877
 878             do {
 879                 unsigned index(local % (sizeof(MappingSet) - 1));
 880                 local /= sizeof(MappingSet) - 1;
 881                 id[--position] = MappingSet[index];
 882             } while (local != 0);
 883
 884             if (scope.Lookup(context, id + position) != NULL)
 885                 goto id;
 886             // XXX: at some point, this could become a keyword
 887
 888             name = $pool.strmemdup(id + position, 7 - position);
 889         }
 890
 891         CYIdentifier *identifier(*i);
 892         _assert(identifier->next_ == identifier);
 893         identifier->next_ = $I(name);
 894     }
 895 }
 896
 897 CYTarget *CYResolveMember::Replace(CYContext &context) {
 898     return $M($M(object_, $S("$cyr")), property_);
 899 }
 900
 901 CYStatement *CYReturn::Replace(CYContext &context) {
 902     if (context.nonlocal_ != NULL) {
 903         CYProperty *value(value_ == NULL ? NULL : $ CYPropertyValue($S("$cyv"), value_));
 904         return $ cy::Syntax::Throw($ CYObject(
 905             $ CYPropertyValue($S("$cyk"), $V(context.nonlocal_->Target(context)), value)
 906         ));
 907     }
 908
 909     context.Replace(value_);
 910     return this;
 911 }
 912
 913 CYTarget *CYRubyBlock::Replace(CYContext &context) {
 914     return lhs_->AddArgument(context, proc_->Replace(context));
 915 }
 916
 917 CYTarget *CYRubyBlock::AddArgument(CYContext &context, CYExpression *value) {
 918     return Replace(context)->AddArgument(context, value);
 919 }
 920
 921 CYTarget *CYRubyProc::Replace(CYContext &context) {
 922     CYFunctionExpression *function($ CYFunctionExpression(NULL, parameters_, code_));
 923     function = CYNonLocalize(context, function);
 924     function->implicit_ = true;
 925     return function;
 926 }
 927
 928 CYScope::CYScope(bool transparent, CYContext &context) :
 929     transparent_(transparent),
 930     parent_(context.scope_),
 931     damaged_(false),
 932     shadow_(NULL),
 933     internal_(NULL)
 934 {
 935     _assert(!transparent_ || parent_ != NULL);
 936     context.scope_ = this;
 937 }
 938
 939 void CYScope::Damage() {
 940     damaged_ = true;
 941     if (parent_ != NULL)
 942         parent_->Damage();
 943 }
 944
 945 CYIdentifierFlags *CYScope::Lookup(CYContext &context, const char *word) {
 946     CYForEach (i, internal_)
 947         if (strcmp(i->identifier_->Word(), word) == 0)
 948             return i;
 949     return NULL;
 950 }
 951
 952 CYIdentifierFlags *CYScope::Lookup(CYContext &context, CYIdentifier *identifier) {
 953     return Lookup(context, identifier->Word());
 954 }
 955
 956 CYIdentifierFlags *CYScope::Declare(CYContext &context, CYIdentifier *identifier, CYIdentifierKind kind) {
 957     _assert(identifier->next_ == NULL || identifier->next_ == identifier);
 958
 959     CYIdentifierFlags *existing(Lookup(context, identifier));
 960     if (existing == NULL)
 961         internal_ = $ CYIdentifierFlags(identifier, kind, internal_);
 962     ++internal_->count_;
 963     if (existing == NULL)
 964         return internal_;
 965
 966     if (kind == CYIdentifierGlobal);
 967     else if (existing->kind_ == CYIdentifierGlobal || existing->kind_ == CYIdentifierMagic)
 968         existing->kind_ = kind;
 969     else if (existing->kind_ == CYIdentifierLexical || kind == CYIdentifierLexical)
 970         _assert(false); // XXX: throw new SyntaxError()
 971
 972     return existing;
 973 }
 974
 975 void CYScope::Merge(CYContext &context, const CYIdentifierFlags *flags) {
 976     _assert(flags->identifier_->next_ == flags->identifier_);
 977     CYIdentifierFlags *existing(Declare(context, flags->identifier_, flags->kind_));
 978     flags->identifier_->next_ = existing->identifier_;
 979
 980     existing->count_ += flags->count_;
 981     if (existing->offset_ < flags->offset_)
 982         existing->offset_ = flags->offset_;
 983 }
 984
 985 void CYScope::Close(CYContext &context, CYStatement *&statements) {
 986     Close(context);
 987
 988     CYList<CYBindings> bindings;
 989
 990     CYForEach (i, internal_)
 991         if (i->kind_ == CYIdentifierVariable)
 992             bindings
 993                 ->* $ CYBindings($ CYBinding(i->identifier_));
 994
 995     if (bindings) {
 996         CYVar *var($ CYVar(bindings));
 997         var->SetNext(statements);
 998         statements = var;
 999     }
1000 }
1001
1002 void CYScope::Close(CYContext &context) {
1003     context.scope_ = parent_;
1004
1005     CYForEach (i, internal_) {
1006         _assert(i->identifier_->next_ == i->identifier_);
1007     switch (i->kind_) {
1008         case CYIdentifierArgument: {
1009             _assert(!transparent_);
1010         } break;
1011
1012         case CYIdentifierLexical: {
1013             if (!damaged_) {
1014                 CYIdentifier *replace(context.Unique());
1015                 replace->next_ = replace;
1016                 i->identifier_->next_ = replace;
1017                 i->identifier_ = replace;
1018             }
1019
1020             if (!transparent_)
1021                 i->kind_ = CYIdentifierVariable;
1022             else
1023                 parent_->Declare(context, i->identifier_, CYIdentifierVariable);
1024         } break;
1025
1026         case CYIdentifierVariable: {
1027             if (transparent_) {
1028                 parent_->Declare(context, i->identifier_, i->kind_);
1029                 i->kind_ = CYIdentifierGlobal;
1030             }
1031         } break;
1032     default:; } }
1033
1034     if (damaged_)
1035         return;
1036
1037     typedef std::multimap<unsigned, CYIdentifier *> CYIdentifierOffsetMap;
1038     CYIdentifierOffsetMap offsets;
1039
1040     CYForEach (i, internal_) {
1041         _assert(i->identifier_->next_ == i->identifier_);
1042     switch (i->kind_) {
1043         case CYIdentifierArgument:
1044         case CYIdentifierVariable:
1045             offsets.insert(CYIdentifierOffsetMap::value_type(i->offset_, i->identifier_));
1046         break;
1047     default:; } }
1048
1049     unsigned offset(0);
1050
1051     for (CYIdentifierOffsetMap::const_iterator i(offsets.begin()); i != offsets.end(); ++i) {
1052         if (offset < i->first)
1053             offset = i->first;
1054         CYIdentifier *identifier(i->second);
1055
1056         if (offset >= context.replace_.size())
1057             context.replace_.resize(offset + 1, NULL);
1058         CYIdentifier *&replace(context.replace_[offset++]);
1059
1060         if (replace == NULL)
1061             replace = identifier;
1062         else {
1063             _assert(replace->next_ == replace);
1064             identifier->next_ = replace;
1065         }
1066     }
1067
1068     if (parent_ == NULL)
1069         return;
1070
1071     CYForEach (i, internal_) {
1072     switch (i->kind_) {
1073         case CYIdentifierGlobal: {
1074             if (i->offset_ < offset)
1075                 i->offset_ = offset;
1076             parent_->Merge(context, i);
1077         } break;
1078     default:; } }
1079 }
1080
1081 CYTarget *CYSubscriptMember::Replace(CYContext &context) {
1082     return $C1($M(object_, $S("$cyg")), property_);
1083 }
1084
1085 CYElementValue *CYSpan::Replace(CYContext &context) { $T(NULL)
1086     return $ CYElementValue(expression_, $ CYElementValue(string_, next_->Replace(context)));
1087 }
1088
1089 CYStatement *CYStatement::Return() {
1090     return this;
1091 }
1092
1093 CYString *CYString::Concat(CYContext &context, CYString *rhs) const {
1094     size_t size(size_ + rhs->size_);
1095     char *value($ char[size + 1]);
1096     memcpy(value, value_, size_);
1097     memcpy(value + size_, rhs->value_, rhs->size_);
1098     value[size] = '\0';
1099     return $S(value, size);
1100 }
1101
1102 CYIdentifier *CYString::Identifier() const {
1103     if (const char *word = Word())
1104         return $ CYIdentifier(word);
1105     return NULL;
1106 }
1107
1108 CYNumber *CYString::Number(CYContext &context) {
1109     // XXX: there is a precise algorithm for this
1110     return NULL;
1111 }
1112
1113 CYExpression *CYString::PropertyName(CYContext &context) {
1114     return this;
1115 }
1116
1117 CYString *CYString::String(CYContext &context) {
1118     return this;
1119 }
1120
1121 CYStatement *CYStructDefinition::Replace(CYContext &context) {
1122     CYTarget *target(tail_->Replace(context));
1123     if (name_ != NULL)
1124         target = $C1($M(target, $S("withName")), $S(name_->Word()));
1125     return $ CYLexical(false, $B1($B($I($pool.strcat(name_->Word(), "$cy", NULL)), target)));
1126 }
1127
1128 CYTarget *CYStructTail::Replace(CYContext &context) {
1129     CYList<CYElementValue> types;
1130     CYList<CYElementValue> names;
1131
1132     CYForEach (field, fields_) {
1133         types->*$ CYElementValue(field->type_->Replace(context));
1134
1135         CYExpression *name;
1136         if (field->name_ == NULL)
1137             name = NULL;
1138         else
1139             name = field->name_->PropertyName(context);
1140         names->*$ CYElementValue(name);
1141     }
1142
1143     return $N2($V("Type"), $ CYArray(types), $ CYArray(names));
1144 }
1145
1146 CYTarget *CYSuperAccess::Replace(CYContext &context) {
1147     return $C1($M($M($M($V(context.super_), $S("prototype")), property_), $S("bind")), $ CYThis());
1148 }
1149
1150 CYTarget *CYSuperCall::Replace(CYContext &context) {
1151     return $C($C1($M($V(context.super_), $S("bind")), $ CYThis()), arguments_);
1152 }
1153
1154 CYTarget *CYSymbol::Replace(CYContext &context) {
1155     return $C1($M($V("Symbol"), $S("for")), $S(name_));
1156 }
1157
1158 CYStatement *CYSwitch::Replace(CYContext &context) {
1159     context.Replace(value_);
1160     clauses_->Replace(context);
1161     return this;
1162 }
1163
1164 CYStatement *CYTarget::Initialize(CYContext &context, CYExpression *value) {
1165     if (value == NULL)
1166         return NULL;
1167     return $E($ CYAssign(this, value));
1168 }
1169
1170 CYTarget *CYTemplate::Replace(CYContext &context) {
1171     return $C2($M($M($M($V("String"), $S("prototype")), $S("concat")), $S("apply")), $S(""), $ CYArray($ CYElementValue(string_, spans_->Replace(context))));
1172 }
1173
1174 CYTarget *CYThis::Replace(CYContext &context) {
1175     if (context.this_ != NULL)
1176         return $V(context.this_->Identifier(context));
1177     return this;
1178 }
1179
1180 namespace cy {
1181 namespace Syntax {
1182
1183 CYStatement *Throw::Replace(CYContext &context) {
1184     context.Replace(value_);
1185     return this;
1186 }
1187
1188 } }
1189
1190 CYTarget *CYTrivial::Replace(CYContext &context) {
1191     return this;
1192 }
1193
1194 CYNumber *CYTrue::Number(CYContext &context) {
1195     return $D(1);
1196 }
1197
1198 CYString *CYTrue::String(CYContext &context) {
1199     return $S("true");
1200 }
1201
1202 namespace cy {
1203 namespace Syntax {
1204
1205 CYStatement *Try::Replace(CYContext &context) {
1206     CYScope scope(true, context);
1207     context.ReplaceAll(code_);
1208     scope.Close(context);
1209
1210     catch_->Replace(context);
1211     finally_->Replace(context);
1212     return this;
1213 }
1214
1215 } }
1216
1217 CYTarget *CYTypeArrayOf::Replace_(CYContext &context, CYTarget *type) {
1218     return next_->Replace(context, $ CYCall($ CYDirectMember(type, $ CYString("arrayOf")), $ CYArgument(size_)));
1219 }
1220
1221 CYTarget *CYTypeBlockWith::Replace_(CYContext &context, CYTarget *type) {
1222     return next_->Replace(context, $ CYCall($ CYDirectMember(type, $ CYString("blockWith")), parameters_->Argument(context)));
1223 }
1224
1225 CYTarget *CYTypeCharacter::Replace(CYContext &context) {
1226     switch (signing_) {
1227         case CYTypeNeutral: return $V("char");
1228         case CYTypeSigned: return $V("schar");
1229         case CYTypeUnsigned: return $V("uchar");
1230         default: _assert(false);
1231     }
1232 }
1233
1234 CYTarget *CYTypeConstant::Replace_(CYContext &context, CYTarget *type) {
1235     return next_->Replace(context, $ CYCall($ CYDirectMember(type, $ CYString("constant"))));
1236 }
1237
1238 CYStatement *CYTypeDefinition::Replace(CYContext &context) {
1239     return $ CYLexical(false, $B1($B(name_, $ CYTypeExpression(type_))));
1240 }
1241
1242 CYTarget *CYTypeEnum::Replace(CYContext &context) {
1243     CYList<CYProperty> properties;
1244     CYForEach (constant, constants_)
1245         properties->*$ CYPropertyValue($S(constant->name_->Word()), constant->value_);
1246     CYObject *constants($ CYObject(properties));
1247
1248     if (specifier_ == NULL)
1249         return $N1($V("Type"), constants);
1250     else
1251         return $C1($M(specifier_->Replace(context), $S("enumFor")), constants);
1252 }
1253
1254 CYTarget *CYTypeError::Replace(CYContext &context) {
1255     _assert(false);
1256     return NULL;
1257 }
1258
1259 CYTarget *CYTypeExpression::Replace(CYContext &context) {
1260     return typed_->Replace(context);
1261 }
1262
1263 CYTarget *CYTypeInt128::Replace(CYContext &context) {
1264     return $V(signing_ == CYTypeUnsigned ? "uint128" : "int128");
1265 }
1266
1267 CYTarget *CYTypeIntegral::Replace(CYContext &context) {
1268     bool u(signing_ == CYTypeUnsigned);
1269     switch (length_) {
1270         case 0: return $V(u ? "ushort" : "short");
1271         case 1: return $V(u ? "uint" : "int");
1272         case 2: return $V(u ? "ulong" : "long");
1273         case 3: return $V(u ? "ulonglong" : "longlong");
1274         default: _assert(false);
1275     }
1276 }
1277
1278 CYTarget *CYTypeModifier::Replace(CYContext &context, CYTarget *type) { $T(type)
1279     return Replace_(context, type);
1280 }
1281
1282 CYTarget *CYTypeFunctionWith::Replace_(CYContext &context, CYTarget *type) {
1283     CYList<CYArgument> arguments(parameters_->Argument(context));
1284     if (variadic_)
1285         arguments->*$C_($ CYNull());
1286     return next_->Replace(context, $ CYCall($ CYDirectMember(type, $ CYString("functionWith")), arguments));
1287 }
1288
1289 CYTarget *CYTypePointerTo::Replace_(CYContext &context, CYTarget *type) {
1290     return next_->Replace(context, $ CYCall($ CYDirectMember(type, $ CYString("pointerTo"))));
1291 }
1292
1293 CYTarget *CYTypeReference::Replace(CYContext &context) {
1294     const char *prefix;
1295     switch (kind_) {
1296         case CYTypeReferenceStruct: prefix = "$cys"; break;
1297         case CYTypeReferenceEnum: prefix = "$cye"; break;
1298         default: _assert(false);
1299     }
1300
1301     return $V($pool.strcat(prefix, name_->Word(), NULL));
1302 }
1303
1304 CYTarget *CYTypeStruct::Replace(CYContext &context) {
1305     CYTarget *target(tail_->Replace(context));
1306     if (name_ != NULL)
1307         target = $C1($M(target, $S("withName")), $S(name_->Word()));
1308     return target;
1309 }
1310
1311 CYTarget *CYTypeVariable::Replace(CYContext &context) {
1312     return $V(name_);
1313 }
1314
1315 CYTarget *CYTypeVoid::Replace(CYContext &context) {
1316     return $N1($V("Type"), $ CYString("v"));
1317 }
1318
1319 CYTarget *CYTypeVolatile::Replace_(CYContext &context, CYTarget *type) {
1320     return next_->Replace(context, $ CYCall($ CYDirectMember(type, $ CYString("volatile"))));
1321 }
1322
1323 CYTarget *CYType::Replace(CYContext &context) {
1324     return modifier_->Replace(context, specifier_->Replace(context));
1325 }
1326
1327 CYTypeFunctionWith *CYType::Function() {
1328     CYTypeModifier *&modifier(CYGetLast(modifier_));
1329     if (modifier == NULL)
1330         return NULL;
1331
1332     CYTypeFunctionWith *function(modifier->Function());
1333     if (function == NULL)
1334         return NULL;
1335
1336     modifier = NULL;
1337     return function;
1338 }
1339
1340 CYArgument *CYTypedParameter::Argument(CYContext &context) { $T(NULL)
1341     return $ CYArgument(type_->Replace(context), next_->Argument(context));
1342 }
1343
1344 CYFunctionParameter *CYTypedParameter::Parameters(CYContext &context) { $T(NULL)
1345     return $ CYFunctionParameter($ CYBinding(name_ ?: context.Unique()), next_->Parameters(context));
1346 }
1347
1348 CYExpression *CYTypedParameter::TypeSignature(CYContext &context, CYExpression *prefix) { $T(prefix)
1349     return next_->TypeSignature(context, $ CYAdd(prefix, type_->Replace(context)));
1350 }
1351
1352 CYForInitializer *CYVar::Replace(CYContext &context) {
1353     if (CYExpression *expression = bindings_->Replace(context, CYIdentifierVariable))
1354         return $E(expression);
1355     return $ CYEmpty();
1356 }
1357
1358 CYTarget *CYVariable::Replace(CYContext &context) {
1359     name_ = name_->Replace(context, CYIdentifierGlobal);
1360     return this;
1361 }
1362
1363 CYFunctionParameter *CYVariable::Parameter() const {
1364     return $ CYFunctionParameter($ CYBinding(name_));
1365 }
1366
1367 CYStatement *CYWhile::Replace(CYContext &context) {
1368     context.Replace(test_);
1369     context.ReplaceAll(code_);
1370     return this;
1371 }
1372
1373 CYStatement *CYWith::Replace(CYContext &context) {
1374     context.Replace(scope_);
1375     CYScope scope(true, context);
1376     scope.Damage();
1377     context.ReplaceAll(code_);
1378     scope.Close(context);
1379     return this;
1380 }
1381
1382 CYExpression *CYWord::PropertyName(CYContext &context) {
1383     return $S(this);
1384 }