Replace.cpp

   1 /* Cycript - Optimizing JavaScript Compiler/Runtime
   2  * Copyright (C) 2009-2015  Jay Freeman (saurik)
   3 */
   4
   5 /* GNU Affero General Public License, Version 3 {{{ */
   6 /*
   7  * This program is free software: you can redistribute it and/or modify
   8  * it under the terms of the GNU Affero General Public License as published by
   9  * the Free Software Foundation, either version 3 of the License, or
  10  * (at your option) any later version.
  11
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU Affero General Public License for more details.
  16
  17  * You should have received a copy of the GNU Affero General Public License
  18  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19 **/
  20 /* }}} */
  21
  22 #include <iomanip>
  23 #include <map>
  24
  25 #include "Replace.hpp"
  26 #include "Syntax.hpp"
  27
  28 CYFunctionExpression *CYNonLocalize(CYContext &context, CYFunctionExpression *function) {
  29     function->nonlocal_ = context.nextlocal_;
  30     return function;
  31 }
  32
  33 CYFunctionExpression *CYSuperize(CYContext &context, CYFunctionExpression *function) {
  34     function->super_ = context.super_;
  35     return function;
  36 }
  37
  38 CYStatement *CYDefineProperty(CYExpression *object, CYExpression *name, bool configurable, bool enumerable, CYProperty *descriptor) {
  39     return $E($C3($M($V("Object"), $S("defineProperty")), object, name, $ CYObject(CYList<CYProperty>()
  40         ->* (configurable ? $ CYPropertyValue($S("configurable"), $ CYTrue()) : NULL)
  41         ->* (enumerable ? $ CYPropertyValue($S("enumerable"), $ CYTrue()) : NULL)
  42         ->* descriptor)));
  43 }
  44
  45 static void CYImplicitReturn(CYStatement *&code) {
  46     if (CYStatement *&last = CYGetLast(code))
  47         last = last->Return();
  48 }
  49
  50 CYExpression *CYAdd::Replace(CYContext &context) {
  51     CYInfix::Replace(context);
  52
  53     CYString *lhs(dynamic_cast<CYString *>(lhs_));
  54     CYString *rhs(dynamic_cast<CYString *>(rhs_));
  55
  56     if (lhs != NULL || rhs != NULL) {
  57         if (lhs == NULL) {
  58             lhs = lhs_->String(context);
  59             if (lhs == NULL)
  60                 return this;
  61         } else if (rhs == NULL) {
  62             rhs = rhs_->String(context);
  63             if (rhs == NULL)
  64                 return this;
  65         }
  66
  67         return lhs->Concat(context, rhs);
  68     }
  69
  70     if (CYNumber *lhn = lhs_->Number(context))
  71         if (CYNumber *rhn = rhs_->Number(context))
  72             return $D(lhn->Value() + rhn->Value());
  73
  74     return this;
  75 }
  76
  77 CYExpression *CYAddressOf::Replace(CYContext &context) {
  78     return $C0($M(rhs_, $S("$cya")));
  79 }
  80
  81 CYTarget *CYApply::AddArgument(CYContext &context, CYExpression *value) {
  82     CYArgument **argument(&arguments_);
  83     while (*argument != NULL)
  84         argument = &(*argument)->next_;
  85     *argument = $ CYArgument(value);
  86     return this;
  87 }
  88
  89 CYArgument *CYArgument::Replace(CYContext &context) { $T(NULL)
  90     context.Replace(value_);
  91     next_ = next_->Replace(context);
  92
  93     if (value_ == NULL) {
  94         if (next_ == NULL)
  95             return NULL;
  96         else
  97             value_ = $U;
  98     }
  99
 100     return this;
 101 }
 102
 103 CYTarget *CYArray::Replace(CYContext &context) {
 104     if (elements_ != NULL)
 105         elements_->Replace(context);
 106     return this;
 107 }
 108
 109 CYTarget *CYArrayComprehension::Replace(CYContext &context) {
 110     CYVariable *cyv($V("$cyv"));
 111
 112     return $C0($F(NULL, $P1($L($I("$cyv")), comprehensions_->Parameters(context)), $$->*
 113         $E($ CYAssign(cyv, $ CYArray()))->*
 114         comprehensions_->Replace(context, $E($C1($M(cyv, $S("push")), expression_)))->*
 115         $ CYReturn(cyv)
 116     ));
 117 }
 118
 119 CYExpression *CYAssignment::Replace(CYContext &context) {
 120     context.Replace(lhs_);
 121     context.Replace(rhs_);
 122     return this;
 123 }
 124
 125 CYStatement *CYBlock::Return() {
 126     CYImplicitReturn(code_);
 127     return this;
 128 }
 129
 130 CYStatement *CYBlock::Replace(CYContext &context) {
 131     CYScope scope(true, context);
 132     context.ReplaceAll(code_);
 133     scope.Close(context);
 134
 135     if (code_ == NULL)
 136         return $ CYEmpty();
 137     return this;
 138 }
 139
 140 CYStatement *CYBreak::Replace(CYContext &context) {
 141     return this;
 142 }
 143
 144 CYTarget *CYCall::Replace(CYContext &context) {
 145     context.Replace(function_);
 146     arguments_->Replace(context);
 147     return this;
 148 }
 149
 150 namespace cy {
 151 namespace Syntax {
 152
 153 void Catch::Replace(CYContext &context) { $T()
 154     CYScope scope(true, context);
 155
 156     name_ = name_->Replace(context, CYIdentifierCatch);
 157
 158     context.ReplaceAll(code_);
 159     scope.Close(context);
 160 }
 161
 162 } }
 163
 164 CYTarget *CYClassExpression::Replace(CYContext &context) {
 165     CYBuilder builder;
 166
 167     CYIdentifier *super(context.Unique());
 168
 169     CYIdentifier *old(context.super_);
 170     context.super_ = super;
 171
 172     CYIdentifier *constructor(context.Unique());
 173     CYForEach (member, tail_->static_)
 174         member->Replace(context, builder, $V(constructor), true);
 175
 176     CYIdentifier *prototype(context.Unique());
 177     CYForEach (member, tail_->instance_)
 178         member->Replace(context, builder, $V(prototype), true);
 179
 180     if (tail_->constructor_ == NULL)
 181         tail_->constructor_ = $ CYFunctionExpression(NULL, NULL, NULL);
 182     tail_->constructor_ = CYSuperize(context, tail_->constructor_);
 183
 184     context.super_ = old;
 185
 186     return $C1($ CYFunctionExpression(NULL, $P($L(super)), $$
 187         ->* $ CYVar($L1($L(constructor, tail_->constructor_)))
 188         ->* $ CYVar($L1($L(prototype, $ CYFunctionExpression(NULL, NULL, NULL))))
 189         ->* $E($ CYAssign($M($V(prototype), $S("prototype")), $M($V(super), $S("prototype"))))
 190         ->* $E($ CYAssign($V(prototype), $N($V(prototype))))
 191         ->* CYDefineProperty($V(prototype), $S("constructor"), false, false, $ CYPropertyValue($S("value"), $V(constructor)))
 192         ->* $ CYVar(builder.declarations_)
 193         ->* builder.statements_
 194         ->* CYDefineProperty($V(constructor), $S("prototype"), false, false, $ CYPropertyValue($S("value"), $V(prototype)))
 195         ->* $ CYReturn($V(constructor))
 196     ), tail_->extends_ ?: $V($I("Object")));
 197 }
 198
 199 CYStatement *CYClassStatement::Replace(CYContext &context) {
 200     return $ CYVar($L1($L(name_, $ CYClassExpression(name_, tail_))));
 201 }
 202
 203 void CYClause::Replace(CYContext &context) { $T()
 204     context.Replace(case_);
 205     context.ReplaceAll(code_);
 206     next_->Replace(context);
 207 }
 208
 209 CYExpression *CYCompound::Replace(CYContext &context) {
 210     context.Replace(expression_);
 211     context.Replace(next_);
 212
 213     if (CYCompound *compound = dynamic_cast<CYCompound *>(expression_)) {
 214         expression_ = compound->expression_;
 215         compound->expression_ = compound->next_;
 216         compound->next_ = next_;
 217         next_ = compound;
 218     }
 219
 220     return this;
 221 }
 222
 223 CYFunctionParameter *CYCompound::Parameter() const {
 224     CYFunctionParameter *next(next_->Parameter());
 225     if (next == NULL)
 226         return NULL;
 227
 228     CYFunctionParameter *parameter(expression_->Parameter());
 229     if (parameter == NULL)
 230         return NULL;
 231
 232     parameter->SetNext(next);
 233     return parameter;
 234 }
 235
 236 CYFunctionParameter *CYComprehension::Parameters(CYContext &context) const { $T(NULL)
 237     CYFunctionParameter *next(next_->Parameters(context));
 238     if (CYFunctionParameter *parameter = Parameter(context)) {
 239         parameter->SetNext(next);
 240         return parameter;
 241     } else
 242         return next;
 243 }
 244
 245 CYStatement *CYComprehension::Replace(CYContext &context, CYStatement *statement) const {
 246     return next_ == NULL ? statement : next_->Replace(context, statement);
 247 }
 248
 249 CYExpression *CYComputed::PropertyName(CYContext &context) {
 250     return expression_;
 251 }
 252
 253 CYExpression *CYCondition::Replace(CYContext &context) {
 254     context.Replace(test_);
 255     context.Replace(true_);
 256     context.Replace(false_);
 257     return this;
 258 }
 259
 260 void CYContext::NonLocal(CYStatement *&statements) {
 261     CYContext &context(*this);
 262
 263     if (nextlocal_ != NULL && nextlocal_->identifier_ != NULL) {
 264         CYIdentifier *cye($I("$cye")->Replace(context, CYIdentifierGlobal));
 265         CYIdentifier *unique(nextlocal_->identifier_->Replace(context, CYIdentifierGlobal));
 266
 267         CYStatement *declare(
 268             $ CYVar($L1($L(unique, $ CYObject()))));
 269
 270         cy::Syntax::Catch *rescue(
 271             $ cy::Syntax::Catch(cye, $$->*
 272                 $ CYIf($ CYIdentical($M($V(cye), $S("$cyk")), $V(unique)), $$->*
 273                     $ CYReturn($M($V(cye), $S("$cyv"))))->*
 274                 $ cy::Syntax::Throw($V(cye))));
 275
 276         context.Replace(declare);
 277         rescue->Replace(context);
 278
 279         statements = $$->*
 280             declare->*
 281             $ cy::Syntax::Try(statements, rescue, NULL);
 282     }
 283 }
 284
 285 CYIdentifier *CYContext::Unique() {
 286     return $ CYIdentifier($pool.strcat("$cy", $pool.itoa(unique_++), NULL));
 287 }
 288
 289 CYStatement *CYContinue::Replace(CYContext &context) {
 290     return this;
 291 }
 292
 293 CYStatement *CYDebugger::Replace(CYContext &context) {
 294     return this;
 295 }
 296
 297 CYTarget *CYDeclaration::Target(CYContext &context) {
 298     return $V(identifier_);
 299 }
 300
 301 CYAssignment *CYDeclaration::Replace(CYContext &context, CYIdentifierKind kind) {
 302     identifier_ = identifier_->Replace(context, kind);
 303
 304     if (initialiser_ == NULL)
 305         return NULL;
 306
 307     CYAssignment *value($ CYAssign(Target(context), initialiser_));
 308     initialiser_ = NULL;
 309     return value;
 310 }
 311
 312 CYExpression *CYDeclarations::Replace(CYContext &context, CYIdentifierKind kind) { $T(NULL)
 313     CYAssignment *assignment(declaration_->Replace(context, kind));
 314     CYExpression *compound(next_->Replace(context, kind));
 315
 316     if (assignment != NULL)
 317         if (compound == NULL)
 318             compound = assignment;
 319         else
 320             compound = $ CYCompound(assignment, compound);
 321     return compound;
 322 }
 323
 324 CYFunctionParameter *CYDeclarations::Parameter(CYContext &context) { $T(NULL)
 325     return $ CYFunctionParameter($ CYDeclaration(declaration_->identifier_), next_->Parameter(context));
 326 }
 327
 328 CYArgument *CYDeclarations::Argument(CYContext &context) { $T(NULL)
 329     return $ CYArgument(declaration_->initialiser_, next_->Argument(context));
 330 }
 331
 332 CYTarget *CYDirectMember::Replace(CYContext &context) {
 333     context.Replace(object_);
 334     context.Replace(property_);
 335     return this;
 336 }
 337
 338 CYStatement *CYDoWhile::Replace(CYContext &context) {
 339     context.Replace(test_);
 340     context.ReplaceAll(code_);
 341     return this;
 342 }
 343
 344 void CYElementSpread::Replace(CYContext &context) {
 345     context.Replace(value_);
 346 }
 347
 348 void CYElementValue::Replace(CYContext &context) {
 349     context.Replace(value_);
 350     if (next_ != NULL)
 351         next_->Replace(context);
 352 }
 353
 354 CYStatement *CYEmpty::Replace(CYContext &context) {
 355     return NULL;
 356 }
 357
 358 CYTarget *CYEncodedType::Replace(CYContext &context) {
 359     return typed_->Replace(context);
 360 }
 361
 362 CYTarget *CYEval::Replace(CYContext &context) {
 363     context.scope_->Damage();
 364     if (arguments_ != NULL)
 365         arguments_->value_ = $C1($M($V("Cycript"), $S("compile")), arguments_->value_);
 366     return $C($V("eval"), arguments_);
 367 }
 368
 369 CYStatement *CYExpress::Return() {
 370     return $ CYReturn(expression_);
 371 }
 372
 373 CYStatement *CYExpress::Replace(CYContext &context) {
 374     context.Replace(expression_);
 375     return this;
 376 }
 377
 378 CYTarget *CYExpression::AddArgument(CYContext &context, CYExpression *value) {
 379     return $C1(this, value);
 380 }
 381
 382 CYFunctionParameter *CYExpression::Parameter() const {
 383     return NULL;
 384 }
 385
 386 CYStatement *CYExternal::Replace(CYContext &context) {
 387     return $E($ CYAssign($V(typed_->identifier_), $C1(typed_->Replace(context), $C2($V("dlsym"), $V("RTLD_DEFAULT"), $S(typed_->identifier_->Word())))));
 388 }
 389
 390 CYNumber *CYFalse::Number(CYContext &context) {
 391     return $D(0);
 392 }
 393
 394 CYString *CYFalse::String(CYContext &context) {
 395     return $S("false");
 396 }
 397
 398 CYExpression *CYFatArrow::Replace(CYContext &context) {
 399     CYFunctionExpression *function($ CYFunctionExpression(NULL, parameters_, code_));
 400     function->this_.SetNext(context.this_);
 401     return function;
 402 }
 403
 404 void CYFinally::Replace(CYContext &context) { $T()
 405     CYScope scope(true, context);
 406     context.ReplaceAll(code_);
 407     scope.Close(context);
 408 }
 409
 410 CYStatement *CYFor::Replace(CYContext &context) {
 411     CYScope outer(true, context);
 412     context.Replace(initialiser_);
 413
 414     context.Replace(test_);
 415
 416     {
 417         CYScope inner(true, context);
 418         context.ReplaceAll(code_);
 419         inner.Close(context);
 420     }
 421
 422     context.Replace(increment_);
 423
 424     outer.Close(context);
 425     return this;
 426 }
 427
 428 CYExpression *CYForDeclarations::Replace(CYContext &context) {
 429     return declarations_->Replace(context, CYIdentifierVariable);
 430 }
 431
 432 CYStatement *CYForLexical::Initialize(CYContext &context, CYExpression *value) {
 433     if (value == NULL) {
 434         if (declaration_->initialiser_ == NULL)
 435             return NULL;
 436         value = declaration_->initialiser_;
 437     }
 438
 439     return $ CYLet(constant_, $L1($ CYDeclaration(declaration_->identifier_, value)));
 440 }
 441
 442 CYTarget *CYForLexical::Replace(CYContext &context) {
 443     _assert(declaration_->Replace(context, CYIdentifierLexical) == NULL);
 444     return declaration_->Target(context);
 445 }
 446
 447 CYStatement *CYForIn::Replace(CYContext &context) {
 448     CYScope scope(true, context);
 449     context.Replace(initialiser_);
 450     context.Replace(set_);
 451     context.ReplaceAll(code_);
 452     scope.Close(context);
 453     return this;
 454 }
 455
 456 CYFunctionParameter *CYForInComprehension::Parameter(CYContext &context) const {
 457     return $ CYFunctionParameter(declaration_);
 458 }
 459
 460 CYStatement *CYForInComprehension::Replace(CYContext &context, CYStatement *statement) const {
 461     return $ CYForIn(declaration_->Target(context), set_, CYComprehension::Replace(context, statement));
 462 }
 463
 464 CYStatement *CYForOf::Replace(CYContext &context) {
 465     CYIdentifier *item(context.Unique()), *list(context.Unique());
 466
 467     return $ CYBlock($$
 468         ->* initialiser_->Initialize(context, NULL)
 469         ->* $ CYLet(false, $L2($L(list, set_), $L(item)))
 470         ->* $ CYForIn($V(item), $V(list), $ CYBlock($$
 471             ->* initialiser_->Initialize(context, $M($V(list), $V(item)))
 472             ->* code_
 473     )));
 474 }
 475
 476 CYFunctionParameter *CYForOfComprehension::Parameter(CYContext &context) const {
 477     return $ CYFunctionParameter(declaration_);
 478 }
 479
 480 CYStatement *CYForOfComprehension::Replace(CYContext &context, CYStatement *statement) const {
 481     CYIdentifier *cys($I("$cys"));
 482
 483     return $E($C0($F(NULL, $P1($L($I("$cys"))), $$->*
 484         $E($ CYAssign($V(cys), set_))->*
 485         $ CYForIn(declaration_->Target(context), $V(cys), $ CYBlock($$->*
 486             $E($ CYAssign(declaration_->Target(context), $M($V(cys), declaration_->Target(context))))->*
 487             CYComprehension::Replace(context, statement)
 488         ))
 489     )));
 490 }
 491
 492 CYStatement *CYForVariable::Initialize(CYContext &context, CYExpression *value) {
 493     if (value == NULL) {
 494         if (declaration_->initialiser_ == NULL)
 495             return NULL;
 496         value = declaration_->initialiser_;
 497     }
 498
 499     return $ CYVar($L1($ CYDeclaration(declaration_->identifier_, value)));
 500 }
 501
 502 CYTarget *CYForVariable::Replace(CYContext &context) {
 503     _assert(declaration_->Replace(context, CYIdentifierVariable) == NULL);
 504     return declaration_->Target(context);
 505 }
 506
 507 // XXX: this is evil evil black magic. don't ask, don't tell... don't believe!
 508 #define MappingSet "0etnirsoalfucdphmgyvbxTwSNECAFjDLkMOIBPqzRH$_WXUVGYKQJZ"
 509 //#define MappingSet "0abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ$_"
 510
 511 void CYFunction::Replace(CYContext &context) {
 512     CYThisScope *_this(context.this_);
 513     context.this_ = &this_;
 514     context.this_ = CYGetLast(context.this_);
 515
 516     CYIdentifier *super(context.super_);
 517     context.super_ = super_;
 518
 519     CYNonLocal *nonlocal(context.nonlocal_);
 520     CYNonLocal *nextlocal(context.nextlocal_);
 521
 522     bool localize;
 523     if (nonlocal_ != NULL) {
 524         localize = false;
 525         context.nonlocal_ = nonlocal_;
 526     } else {
 527         localize = true;
 528         nonlocal_ = $ CYNonLocal();
 529         context.nextlocal_ = nonlocal_;
 530     }
 531
 532     CYScope scope(!localize, context);
 533
 534     parameters_->Replace(context, code_);
 535
 536     context.ReplaceAll(code_);
 537
 538     if (implicit_)
 539         CYImplicitReturn(code_);
 540
 541     if (CYIdentifier *identifier = this_.identifier_) {
 542         context.scope_->Declare(context, identifier, CYIdentifierVariable);
 543         code_ = $$
 544             ->*$E($ CYAssign($V(identifier), $ CYThis()))
 545             ->*code_
 546         ;
 547     }
 548
 549     if (localize)
 550         context.NonLocal(code_);
 551
 552     context.nextlocal_ = nextlocal;
 553     context.nonlocal_ = nonlocal;
 554
 555     context.super_ = super;
 556     context.this_ = _this;
 557
 558     scope.Close(context, code_);
 559 }
 560
 561 CYTarget *CYFunctionExpression::Replace(CYContext &context) {
 562     CYScope scope(false, context);
 563     if (name_ != NULL)
 564         name_ = name_->Replace(context, CYIdentifierOther);
 565
 566     CYFunction::Replace(context);
 567     scope.Close(context);
 568     return this;
 569 }
 570
 571 void CYFunctionParameter::Replace(CYContext &context, CYStatement *&statements) { $T()
 572     CYAssignment *assignment(initialiser_->Replace(context, CYIdentifierArgument));
 573
 574     next_->Replace(context, statements);
 575
 576     if (assignment != NULL)
 577         statements = $$->*
 578             $ CYIf($ CYIdentical($ CYTypeOf(initialiser_->Target(context)), $S("undefined")), $$->*
 579                 $E(assignment)
 580             )->*
 581             statements;
 582 }
 583
 584 CYStatement *CYFunctionStatement::Replace(CYContext &context) {
 585     name_ = name_->Replace(context, CYIdentifierOther);
 586     CYFunction::Replace(context);
 587     return this;
 588 }
 589
 590 CYIdentifier *CYIdentifier::Replace(CYContext &context, CYIdentifierKind kind) {
 591     if (next_ == this)
 592         return this;
 593     if (next_ != NULL)
 594         return next_->Replace(context, kind);
 595     next_ = context.scope_->Declare(context, this, kind)->identifier_;
 596     return next_;
 597 }
 598
 599 CYStatement *CYIf::Return() {
 600     CYImplicitReturn(true_);
 601     CYImplicitReturn(false_);
 602     return this;
 603 }
 604
 605 CYStatement *CYIf::Replace(CYContext &context) {
 606     context.Replace(test_);
 607     context.ReplaceAll(true_);
 608     context.ReplaceAll(false_);
 609     return this;
 610 }
 611
 612 CYFunctionParameter *CYIfComprehension::Parameter(CYContext &context) const {
 613     return NULL;
 614 }
 615
 616 CYStatement *CYIfComprehension::Replace(CYContext &context, CYStatement *statement) const {
 617     return $ CYIf(test_, CYComprehension::Replace(context, statement));
 618 }
 619
 620 CYStatement *CYImport::Replace(CYContext &context) {
 621     return $ CYVar($L1($L($I(module_->part_->Word()), $C1($V("require"), module_->Replace(context, "/")))));
 622 }
 623
 624 CYTarget *CYIndirect::Replace(CYContext &context) {
 625     return $M(rhs_, $S("$cyi"));
 626 }
 627
 628 CYTarget *CYIndirectMember::Replace(CYContext &context) {
 629     return $M($ CYIndirect(object_), property_);
 630 }
 631
 632 CYExpression *CYInfix::Replace(CYContext &context) {
 633     context.Replace(lhs_);
 634     context.Replace(rhs_);
 635     return this;
 636 }
 637
 638 CYStatement *CYLabel::Replace(CYContext &context) {
 639     context.Replace(statement_);
 640     return this;
 641 }
 642
 643 CYTarget *CYLambda::Replace(CYContext &context) {
 644     return $N2($V("Functor"), $ CYFunctionExpression(NULL, parameters_->Parameters(context), code_), parameters_->TypeSignature(context, typed_->Replace(context)));
 645 }
 646
 647 CYStatement *CYLet::Replace(CYContext &context) {
 648     if (CYExpression *expression = declarations_->Replace(context, CYIdentifierLexical))
 649         return $E(expression);
 650     return $ CYEmpty();
 651 }
 652
 653 CYFunctionExpression *CYMethod::Constructor() {
 654     return NULL;
 655 }
 656
 657 void CYMethod::Replace(CYContext &context) {
 658     CYFunction::Replace(context);
 659 }
 660
 661 CYString *CYModule::Replace(CYContext &context, const char *separator) const {
 662     if (next_ == NULL)
 663         return $ CYString(part_);
 664     return $ CYString($pool.strcat(next_->Replace(context, separator)->Value(), separator, part_->Word(), NULL));
 665 }
 666
 667 CYExpression *CYMultiply::Replace(CYContext &context) {
 668     CYInfix::Replace(context);
 669
 670     if (CYNumber *lhn = lhs_->Number(context))
 671         if (CYNumber *rhn = rhs_->Number(context))
 672             return $D(lhn->Value() * rhn->Value());
 673
 674     return this;
 675 }
 676
 677 namespace cy {
 678 namespace Syntax {
 679
 680 CYTarget *New::AddArgument(CYContext &context, CYExpression *value) {
 681     CYSetLast(arguments_) = $ CYArgument(value);
 682     return this;
 683 }
 684
 685 CYTarget *New::Replace(CYContext &context) {
 686     context.Replace(constructor_);
 687     arguments_->Replace(context);
 688     return this;
 689 }
 690
 691 } }
 692
 693 CYNumber *CYNull::Number(CYContext &context) {
 694     return $D(0);
 695 }
 696
 697 CYString *CYNull::String(CYContext &context) {
 698     return $S("null");
 699 }
 700
 701 CYNumber *CYNumber::Number(CYContext &context) {
 702     return this;
 703 }
 704
 705 CYString *CYNumber::String(CYContext &context) {
 706     // XXX: there is a precise algorithm for this
 707     return $S($pool.sprintf(24, "%.17g", Value()));
 708 }
 709
 710 CYExpression *CYNumber::PropertyName(CYContext &context) {
 711     return String(context);
 712 }
 713
 714 CYTarget *CYObject::Replace(CYContext &context) {
 715     CYBuilder builder;
 716     if (properties_ != NULL)
 717         properties_ = properties_->ReplaceAll(context, builder, $ CYThis(), false);
 718
 719     if (builder) {
 720         return $C1($M($ CYFunctionExpression(NULL, builder.declarations_->Parameter(context),
 721             builder.statements_->*
 722                 $ CYReturn($ CYThis())
 723         ), $S("call")), this, builder.declarations_->Argument(context));
 724     }
 725
 726     CYForEach (property, properties_)
 727         property->Replace(context);
 728     return this;
 729 }
 730
 731 CYTarget *CYParenthetical::Replace(CYContext &context) {
 732     // XXX: return expression_;
 733     context.Replace(expression_);
 734     return this;
 735 }
 736
 737 CYExpression *CYPostfix::Replace(CYContext &context) {
 738     context.Replace(lhs_);
 739     return this;
 740 }
 741
 742 CYExpression *CYPrefix::Replace(CYContext &context) {
 743     context.Replace(rhs_);
 744     return this;
 745 }
 746
 747 CYProperty *CYProperty::ReplaceAll(CYContext &context, CYBuilder &builder, CYExpression *self, bool update) {
 748     update |= name_->Computed();
 749     if (update)
 750         Replace(context, builder, self, false);
 751     if (next_ != NULL)
 752         next_ = next_->ReplaceAll(context, builder, self, update);
 753     return update ? next_ : this;
 754 }
 755
 756 void CYProperty::Replace(CYContext &context, CYBuilder &builder, CYExpression *self, bool protect) {
 757     CYExpression *name(name_->PropertyName(context));
 758     if (name_->Computed()) {
 759         CYIdentifier *unique(context.Unique());
 760         builder.declarations_->*$L1($L(unique, name));
 761         name = $V(unique);
 762     }
 763
 764     Replace(context, builder, self, name, protect);
 765 }
 766
 767 void CYPropertyGetter::Replace(CYContext &context, CYBuilder &builder, CYExpression *self, CYExpression *name, bool protect) {
 768     CYIdentifier *unique(context.Unique());
 769     builder.declarations_
 770         ->* $L1($L(unique, CYSuperize(context, $ CYFunctionExpression(NULL, parameters_, code_))));
 771     builder.statements_
 772         ->* CYDefineProperty(self, name, true, !protect, $ CYPropertyValue($S("get"), $V(unique)));
 773 }
 774
 775 CYFunctionExpression *CYPropertyMethod::Constructor() {
 776     return name_->Constructor() ? $ CYFunctionExpression(NULL, parameters_, code_) : NULL;
 777 }
 778
 779 void CYPropertyMethod::Replace(CYContext &context, CYBuilder &builder, CYExpression *self, CYExpression *name, bool protect) {
 780     CYIdentifier *unique(context.Unique());
 781     builder.declarations_
 782         ->* $L1($L(unique, CYSuperize(context, $ CYFunctionExpression(NULL, parameters_, code_))));
 783     builder.statements_
 784         ->* (!protect ? $E($ CYAssign($M(self, name), $V(unique))) :
 785             CYDefineProperty(self, name, true, !protect, $ CYPropertyValue($S("value"), $V(unique), $ CYPropertyValue($S("writable"), $ CYTrue()))));
 786 }
 787
 788 void CYPropertySetter::Replace(CYContext &context, CYBuilder &builder, CYExpression *self, CYExpression *name, bool protect) {
 789     CYIdentifier *unique(context.Unique());
 790     builder.declarations_
 791         ->* $L1($L(unique, CYSuperize(context, $ CYFunctionExpression(NULL, parameters_, code_))));
 792     builder.statements_
 793         ->* CYDefineProperty(self, name, true, !protect, $ CYPropertyValue($S("set"), $V(unique)));
 794 }
 795
 796 void CYPropertyValue::Replace(CYContext &context, CYBuilder &builder, CYExpression *self, CYExpression *name, bool protect) {
 797     _assert(!protect);
 798     CYIdentifier *unique(context.Unique());
 799     builder.declarations_
 800         ->* $L1($L(unique, value_));
 801     builder.statements_
 802         ->* $E($ CYAssign($M(self, name), $V(unique)));
 803 }
 804
 805 void CYPropertyValue::Replace(CYContext &context) {
 806     context.Replace(value_);
 807 }
 808
 809 void CYScript::Replace(CYContext &context) {
 810     CYScope scope(false, context);
 811     context.scope_->Damage();
 812
 813     context.nextlocal_ = $ CYNonLocal();
 814     context.ReplaceAll(code_);
 815     context.NonLocal(code_);
 816
 817     scope.Close(context, code_);
 818
 819     unsigned offset(0);
 820
 821     for (std::vector<CYIdentifier *>::const_iterator i(context.replace_.begin()); i != context.replace_.end(); ++i) {
 822         const char *name;
 823         if (context.options_.verbose_)
 824             name = $pool.strcat("$", $pool.itoa(offset++), NULL);
 825         else {
 826             char id[8];
 827             id[7] = '\0';
 828
 829           id:
 830             unsigned position(7), local(offset++ + 1);
 831
 832             do {
 833                 unsigned index(local % (sizeof(MappingSet) - 1));
 834                 local /= sizeof(MappingSet) - 1;
 835                 id[--position] = MappingSet[index];
 836             } while (local != 0);
 837
 838             if (scope.Lookup(context, id + position) != NULL)
 839                 goto id;
 840             // XXX: at some point, this could become a keyword
 841
 842             name = $pool.strmemdup(id + position, 7 - position);
 843         }
 844
 845         CYIdentifier *identifier(*i);
 846         _assert(identifier->next_ == identifier);
 847         identifier->next_ = $I(name);
 848     }
 849 }
 850
 851 CYStatement *CYReturn::Replace(CYContext &context) {
 852     if (context.nonlocal_ != NULL) {
 853         CYProperty *value(value_ == NULL ? NULL : $ CYPropertyValue($S("$cyv"), value_));
 854         return $ cy::Syntax::Throw($ CYObject(
 855             $ CYPropertyValue($S("$cyk"), $V(context.nonlocal_->Target(context)), value)
 856         ));
 857     }
 858
 859     context.Replace(value_);
 860     return this;
 861 }
 862
 863 CYTarget *CYRubyBlock::Replace(CYContext &context) {
 864     return call_->AddArgument(context, proc_->Replace(context));
 865 }
 866
 867 CYTarget *CYRubyBlock::AddArgument(CYContext &context, CYExpression *value) {
 868     return Replace(context)->AddArgument(context, value);
 869 }
 870
 871 CYTarget *CYRubyProc::Replace(CYContext &context) {
 872     CYFunctionExpression *function($ CYFunctionExpression(NULL, parameters_, code_));
 873     function = CYNonLocalize(context, function);
 874     function->implicit_ = true;
 875     return function;
 876 }
 877
 878 CYScope::CYScope(bool transparent, CYContext &context) :
 879     transparent_(transparent),
 880     parent_(context.scope_),
 881     damaged_(false),
 882     shadow_(NULL),
 883     internal_(NULL)
 884 {
 885     _assert(!transparent_ || parent_ != NULL);
 886     context.scope_ = this;
 887 }
 888
 889 void CYScope::Damage() {
 890     damaged_ = true;
 891     if (parent_ != NULL)
 892         parent_->Damage();
 893 }
 894
 895 CYIdentifierFlags *CYScope::Lookup(CYContext &context, const char *word) {
 896     CYForEach (i, internal_)
 897         if (strcmp(i->identifier_->Word(), word) == 0)
 898             return i;
 899     return NULL;
 900 }
 901
 902 CYIdentifierFlags *CYScope::Lookup(CYContext &context, CYIdentifier *identifier) {
 903     return Lookup(context, identifier->Word());
 904 }
 905
 906 CYIdentifierFlags *CYScope::Declare(CYContext &context, CYIdentifier *identifier, CYIdentifierKind kind) {
 907     _assert(identifier->next_ == NULL || identifier->next_ == identifier);
 908
 909     CYIdentifierFlags *existing(Lookup(context, identifier));
 910     if (existing == NULL)
 911         internal_ = $ CYIdentifierFlags(identifier, kind, internal_);
 912     ++internal_->count_;
 913     if (existing == NULL)
 914         return internal_;
 915
 916     switch (kind) {
 917         case CYIdentifierArgument:
 918         case CYIdentifierCatch:
 919         case CYIdentifierMagic:
 920             _assert(false);
 921         default:
 922             break;
 923     }
 924
 925     if (existing->kind_ == CYIdentifierGlobal)
 926         existing->kind_ = kind;
 927     else if (kind == CYIdentifierGlobal)
 928         ;
 929     else if (existing->kind_ == CYIdentifierLexical || kind == CYIdentifierLexical)
 930         _assert(false); // XXX: throw new SyntaxError()
 931
 932     return existing;
 933 }
 934
 935 void CYScope::Merge(CYContext &context, const CYIdentifierFlags *flags) {
 936     _assert(flags->identifier_->next_ == flags->identifier_);
 937     CYIdentifierFlags *existing(Declare(context, flags->identifier_, flags->kind_));
 938     flags->identifier_->next_ = existing->identifier_;
 939
 940     existing->count_ += flags->count_;
 941     if (existing->offset_ < flags->offset_)
 942         existing->offset_ = flags->offset_;
 943 }
 944
 945 void CYScope::Close(CYContext &context, CYStatement *&statements) {
 946     Close(context);
 947
 948     CYList<CYDeclarations> declarations;
 949
 950     CYForEach (i, internal_)
 951         if (i->kind_ == CYIdentifierVariable)
 952             declarations ->* $ CYDeclarations($ CYDeclaration(i->identifier_));
 953
 954     if (declarations) {
 955         CYVar *var($ CYVar(declarations));
 956         var->SetNext(statements);
 957         statements = var;
 958     }
 959 }
 960
 961 void CYScope::Close(CYContext &context) {
 962     context.scope_ = parent_;
 963
 964     CYForEach (i, internal_) {
 965         _assert(i->identifier_->next_ == i->identifier_);
 966     switch (i->kind_) {
 967         case CYIdentifierArgument: {
 968             _assert(!transparent_);
 969         } break;
 970
 971         case CYIdentifierLexical: {
 972             if (!damaged_) {
 973                 CYIdentifier *replace(context.Unique());
 974                 replace->next_ = replace;
 975                 i->identifier_->next_ = replace;
 976                 i->identifier_ = replace;
 977             }
 978
 979             if (!transparent_)
 980                 i->kind_ = CYIdentifierVariable;
 981             else
 982                 parent_->Declare(context, i->identifier_, CYIdentifierVariable);
 983         } break;
 984
 985         case CYIdentifierVariable: {
 986             if (transparent_) {
 987                 parent_->Declare(context, i->identifier_, i->kind_);
 988                 i->kind_ = CYIdentifierGlobal;
 989             }
 990         } break;
 991     default:; } }
 992
 993     if (damaged_)
 994         return;
 995
 996     typedef std::multimap<unsigned, CYIdentifier *> CYIdentifierOffsetMap;
 997     CYIdentifierOffsetMap offsets;
 998
 999     CYForEach (i, internal_) {
1000         _assert(i->identifier_->next_ == i->identifier_);
1001     switch (i->kind_) {
1002         case CYIdentifierArgument:
1003         case CYIdentifierVariable:
1004             offsets.insert(CYIdentifierOffsetMap::value_type(i->offset_, i->identifier_));
1005         break;
1006     default:; } }
1007
1008     unsigned offset(0);
1009
1010     for (CYIdentifierOffsetMap::const_iterator i(offsets.begin()); i != offsets.end(); ++i) {
1011         if (offset < i->first)
1012             offset = i->first;
1013         CYIdentifier *identifier(i->second);
1014
1015         if (offset >= context.replace_.size())
1016             context.replace_.resize(offset + 1, NULL);
1017         CYIdentifier *&replace(context.replace_[offset++]);
1018
1019         if (replace == NULL)
1020             replace = identifier;
1021         else {
1022             _assert(replace->next_ == replace);
1023             identifier->next_ = replace;
1024         }
1025     }
1026
1027     if (parent_ == NULL)
1028         return;
1029
1030     CYForEach (i, internal_) {
1031     switch (i->kind_) {
1032         case CYIdentifierGlobal: {
1033             if (i->offset_ < offset)
1034                 i->offset_ = offset;
1035             parent_->Merge(context, i);
1036         } break;
1037     default:; } }
1038 }
1039
1040 CYElementValue *CYSpan::Replace(CYContext &context) { $T(NULL)
1041     return $ CYElementValue(expression_, $ CYElementValue(string_, next_->Replace(context)));
1042 }
1043
1044 CYStatement *CYStatement::Return() {
1045     return this;
1046 }
1047
1048 CYString *CYString::Concat(CYContext &context, CYString *rhs) const {
1049     size_t size(size_ + rhs->size_);
1050     char *value($ char[size + 1]);
1051     memcpy(value, value_, size_);
1052     memcpy(value + size_, rhs->value_, rhs->size_);
1053     value[size] = '\0';
1054     return $S(value, size);
1055 }
1056
1057 CYNumber *CYString::Number(CYContext &context) {
1058     // XXX: there is a precise algorithm for this
1059     return NULL;
1060 }
1061
1062 CYExpression *CYString::PropertyName(CYContext &context) {
1063     return this;
1064 }
1065
1066 CYString *CYString::String(CYContext &context) {
1067     return this;
1068 }
1069
1070 CYTarget *CYSuperAccess::Replace(CYContext &context) {
1071     return $C1($M($M($M($V(context.super_), $S("prototype")), property_), $S("bind")), $ CYThis());
1072 }
1073
1074 CYTarget *CYSuperCall::Replace(CYContext &context) {
1075     return $C($C1($M($V(context.super_), $S("bind")), $ CYThis()), arguments_);
1076 }
1077
1078 CYStatement *CYSwitch::Replace(CYContext &context) {
1079     context.Replace(value_);
1080     clauses_->Replace(context);
1081     return this;
1082 }
1083
1084 CYStatement *CYTarget::Initialize(CYContext &context, CYExpression *value) {
1085     if (value == NULL)
1086         return NULL;
1087     return $E($ CYAssign(this, value));
1088 }
1089
1090 CYTarget *CYTemplate::Replace(CYContext &context) {
1091     return $C2($M($M($M($V("String"), $S("prototype")), $S("concat")), $S("apply")), $S(""), $ CYArray($ CYElementValue(string_, spans_->Replace(context))));
1092 }
1093
1094 CYTarget *CYThis::Replace(CYContext &context) {
1095     if (context.this_ != NULL)
1096         return $V(context.this_->Identifier(context));
1097     return this;
1098 }
1099
1100 namespace cy {
1101 namespace Syntax {
1102
1103 CYStatement *Throw::Replace(CYContext &context) {
1104     context.Replace(value_);
1105     return this;
1106 }
1107
1108 } }
1109
1110 CYTarget *CYTrivial::Replace(CYContext &context) {
1111     return this;
1112 }
1113
1114 CYNumber *CYTrue::Number(CYContext &context) {
1115     return $D(1);
1116 }
1117
1118 CYString *CYTrue::String(CYContext &context) {
1119     return $S("true");
1120 }
1121
1122 namespace cy {
1123 namespace Syntax {
1124
1125 CYStatement *Try::Replace(CYContext &context) {
1126     CYScope scope(true, context);
1127     context.ReplaceAll(code_);
1128     scope.Close(context);
1129
1130     catch_->Replace(context);
1131     finally_->Replace(context);
1132     return this;
1133 }
1134
1135 } }
1136
1137 CYTarget *CYTypeArrayOf::Replace_(CYContext &context, CYTarget *type) {
1138     return next_->Replace(context, $ CYCall($ CYDirectMember(type, $ CYString("arrayOf")), $ CYArgument(size_)));
1139 }
1140
1141 CYTarget *CYTypeBlockWith::Replace_(CYContext &context, CYTarget *type) {
1142     return next_->Replace(context, $ CYCall($ CYDirectMember(type, $ CYString("blockWith")), parameters_->Argument(context)));
1143 }
1144
1145 CYTarget *CYTypeConstant::Replace_(CYContext &context, CYTarget *type) {
1146     return next_->Replace(context, $ CYCall($ CYDirectMember(type, $ CYString("constant"))));
1147 }
1148
1149 CYStatement *CYTypeDefinition::Replace(CYContext &context) {
1150     return $E($ CYAssign($V(typed_->identifier_), typed_->Replace(context)));
1151 }
1152
1153 CYTarget *CYTypeError::Replace(CYContext &context) {
1154     _assert(false);
1155     return NULL;
1156 }
1157
1158 CYTarget *CYTypeModifier::Replace(CYContext &context, CYTarget *type) { $T(type)
1159     return Replace_(context, type);
1160 }
1161
1162 CYTarget *CYTypeFunctionWith::Replace_(CYContext &context, CYTarget *type) {
1163     return next_->Replace(context, $ CYCall($ CYDirectMember(type, $ CYString("functionWith")), parameters_->Argument(context)));
1164 }
1165
1166 CYTarget *CYTypeLong::Replace(CYContext &context) {
1167     return $ CYCall($ CYDirectMember(specifier_->Replace(context), $ CYString("long")));
1168 }
1169
1170 CYTarget *CYTypePointerTo::Replace_(CYContext &context, CYTarget *type) {
1171     return next_->Replace(context, $ CYCall($ CYDirectMember(type, $ CYString("pointerTo"))));
1172 }
1173
1174 CYTarget *CYTypeShort::Replace(CYContext &context) {
1175     return $ CYCall($ CYDirectMember(specifier_->Replace(context), $ CYString("short")));
1176 }
1177
1178 CYTarget *CYTypeSigned::Replace(CYContext &context) {
1179     return $ CYCall($ CYDirectMember(specifier_->Replace(context), $ CYString("signed")));
1180 }
1181
1182 CYTarget *CYTypeUnsigned::Replace(CYContext &context) {
1183     return $ CYCall($ CYDirectMember(specifier_->Replace(context), $ CYString("unsigned")));
1184 }
1185
1186 CYTarget *CYTypeVariable::Replace(CYContext &context) {
1187     return $V(name_);
1188 }
1189
1190 CYTarget *CYTypeVoid::Replace(CYContext &context) {
1191     return $N1($V("Type"), $ CYString("v"));
1192 }
1193
1194 CYTarget *CYTypeVolatile::Replace_(CYContext &context, CYTarget *type) {
1195     return next_->Replace(context, $ CYCall($ CYDirectMember(type, $ CYString("volatile"))));
1196 }
1197
1198 CYTarget *CYTypedIdentifier::Replace(CYContext &context) {
1199     return modifier_->Replace(context, specifier_->Replace(context));
1200 }
1201
1202 CYTypeFunctionWith *CYTypedIdentifier::Function() {
1203     CYTypeModifier **modifier(&modifier_);
1204     if (*modifier == NULL)
1205         return NULL;
1206     while ((*modifier)->next_ != NULL)
1207         modifier = &(*modifier)->next_;
1208     CYTypeFunctionWith *function((*modifier)->Function());
1209     if (function == NULL)
1210         return NULL;
1211     *modifier = NULL;
1212     return function;
1213 }
1214
1215 CYArgument *CYTypedParameter::Argument(CYContext &context) { $T(NULL)
1216     return $ CYArgument(typed_->Replace(context), next_->Argument(context));
1217 }
1218
1219 CYFunctionParameter *CYTypedParameter::Parameters(CYContext &context) { $T(NULL)
1220     return $ CYFunctionParameter($ CYDeclaration(typed_->identifier_ ?: context.Unique()), next_->Parameters(context));
1221 }
1222
1223 CYExpression *CYTypedParameter::TypeSignature(CYContext &context, CYExpression *prefix) { $T(prefix)
1224     return next_->TypeSignature(context, $ CYAdd(prefix, typed_->Replace(context)));
1225 }
1226
1227 CYStatement *CYVar::Replace(CYContext &context) {
1228     if (CYExpression *expression = declarations_->Replace(context, CYIdentifierVariable))
1229         return $E(expression);
1230     return $ CYEmpty();
1231 }
1232
1233 CYTarget *CYVariable::Replace(CYContext &context) {
1234     name_ = name_->Replace(context, CYIdentifierGlobal);
1235     return this;
1236 }
1237
1238 CYFunctionParameter *CYVariable::Parameter() const {
1239     return $ CYFunctionParameter($ CYDeclaration(name_));
1240 }
1241
1242 CYStatement *CYWhile::Replace(CYContext &context) {
1243     context.Replace(test_);
1244     context.ReplaceAll(code_);
1245     return this;
1246 }
1247
1248 CYStatement *CYWith::Replace(CYContext &context) {
1249     context.Replace(scope_);
1250     context.ReplaceAll(code_);
1251     return this;
1252 }
1253
1254 CYExpression *CYWord::PropertyName(CYContext &context) {
1255     return $S(this);
1256 }