Replace.cpp

   1 /* Cycript - Optimizing JavaScript Compiler/Runtime
   2  * Copyright (C) 2009-2013  Jay Freeman (saurik)
   3 */
   4
   5 /* GNU General Public License, Version 3 {{{ */
   6 /*
   7  * Cycript is free software: you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published
   9  * by the Free Software Foundation, either version 3 of the License,
  10  * or (at your option) any later version.
  11  *
  12  * Cycript is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with Cycript.  If not, see <http://www.gnu.org/licenses/>.
  19 **/
  20 /* }}} */
  21
  22 #include "Parser.hpp"
  23 #include "Replace.hpp"
  24
  25 #include <iomanip>
  26
  27 CYFunctionExpression *CYNonLocalize(CYContext &context, CYFunctionExpression *function) {
  28     function->nonlocal_ = context.nextlocal_;
  29     return function;
  30 }
  31
  32 CYExpression *CYAdd::Replace(CYContext &context) {
  33     CYInfix::Replace(context);
  34
  35     CYExpression *lhp(lhs_->Primitive(context));
  36     CYExpression *rhp(rhs_->Primitive(context));
  37
  38     CYString *lhs(dynamic_cast<CYString *>(lhp));
  39     CYString *rhs(dynamic_cast<CYString *>(rhp));
  40
  41     if (lhs != NULL || rhs != NULL) {
  42         if (lhs == NULL) {
  43             lhs = lhp->String(context);
  44             if (lhs == NULL)
  45                 return this;
  46         } else if (rhs == NULL) {
  47             rhs = rhp->String(context);
  48             if (rhs == NULL)
  49                 return this;
  50         }
  51
  52         return lhs->Concat(context, rhs);
  53     }
  54
  55     if (CYNumber *lhn = lhp->Number(context))
  56         if (CYNumber *rhn = rhp->Number(context))
  57             return $D(lhn->Value() + rhn->Value());
  58
  59     return this;
  60 }
  61
  62 CYExpression *CYAddressOf::Replace(CYContext &context) {
  63     return $C0($M(rhs_, $S("$cya")));
  64 }
  65
  66 CYArgument *CYArgument::Replace(CYContext &context) { $T(NULL)
  67     context.Replace(value_);
  68     next_ = next_->Replace(context);
  69
  70     if (value_ == NULL) {
  71         if (next_ == NULL)
  72             return NULL;
  73         else
  74             value_ = $U;
  75     }
  76
  77     return this;
  78 }
  79
  80 CYExpression *CYArray::Replace(CYContext &context) {
  81     elements_->Replace(context);
  82     return this;
  83 }
  84
  85 CYExpression *CYArrayComprehension::Replace(CYContext &context) {
  86     CYVariable *cyv($V("$cyv"));
  87
  88     return $C0($F(NULL, $P1($L("$cyv"), comprehensions_->Parameters(context)), $$->*
  89         $E($ CYAssign(cyv, $ CYArray()))->*
  90         comprehensions_->Replace(context, $E($C1($M(cyv, $S("push")), expression_)))->*
  91         $ CYReturn(cyv)
  92     ));
  93 }
  94
  95 CYExpression *CYAssignment::Replace(CYContext &context) {
  96     context.Replace(lhs_);
  97     context.Replace(rhs_);
  98     return this;
  99 }
 100
 101 CYStatement *CYBlock::Replace(CYContext &context) {
 102     context.ReplaceAll(statements_);
 103     if (statements_ == NULL)
 104         return $ CYEmpty();
 105     return this;
 106 }
 107
 108 CYStatement *CYBreak::Replace(CYContext &context) {
 109     return this;
 110 }
 111
 112 CYExpression *CYCall::AddArgument(CYContext &context, CYExpression *value) {
 113     CYArgument **argument(&arguments_);
 114     while (*argument != NULL)
 115         argument = &(*argument)->next_;
 116     *argument = $ CYArgument(value);
 117     return this;
 118 }
 119
 120 CYExpression *CYCall::Replace(CYContext &context) {
 121     context.Replace(function_);
 122     arguments_->Replace(context);
 123     return this;
 124 }
 125
 126 namespace cy {
 127 namespace Syntax {
 128
 129 void Catch::Replace(CYContext &context) { $T()
 130     CYScope scope(true, context, code_.statements_);
 131
 132     context.Replace(name_);
 133     context.scope_->Declare(context, name_, CYIdentifierCatch);
 134
 135     code_.Replace(context);
 136     scope.Close();
 137 }
 138
 139 } }
 140
 141 void CYClause::Replace(CYContext &context) { $T()
 142     context.Replace(case_);
 143     context.ReplaceAll(statements_);
 144     next_->Replace(context);
 145 }
 146
 147 CYStatement *CYComment::Replace(CYContext &context) {
 148     return this;
 149 }
 150
 151 CYExpression *CYCompound::Replace(CYContext &context) {
 152     context.ReplaceAll(expressions_);
 153     if (expressions_ == NULL)
 154         return NULL;
 155     return this;
 156 }
 157
 158 CYExpression *CYCompound::Primitive(CYContext &context) {
 159     CYExpression *expression(expressions_);
 160     if (expression == NULL)
 161         return NULL;
 162     while (expression->next_ != NULL)
 163         expression = expression->next_;
 164     return expression->Primitive(context);
 165 }
 166
 167 CYFunctionParameter *CYComprehension::Parameters(CYContext &context) const { $T(NULL)
 168     CYFunctionParameter *next(next_->Parameters(context));
 169     if (CYFunctionParameter *parameter = Parameter(context)) {
 170         parameter->SetNext(next);
 171         return parameter;
 172     } else
 173         return next;
 174 }
 175
 176 CYStatement *CYComprehension::Replace(CYContext &context, CYStatement *statement) const {
 177     return next_ == NULL ? statement : next_->Replace(context, statement);
 178 }
 179
 180 CYExpression *CYCondition::Replace(CYContext &context) {
 181     context.Replace(test_);
 182     context.Replace(true_);
 183     context.Replace(false_);
 184     return this;
 185 }
 186
 187 void CYContext::NonLocal(CYStatement *&statements) {
 188     CYContext &context(*this);
 189
 190     if (nextlocal_ != NULL && nextlocal_->identifier_ != NULL) {
 191         CYIdentifier *cye($I("$cye")->Replace(context));
 192         CYIdentifier *unique(nextlocal_->identifier_->Replace(context));
 193
 194         CYStatement *declare(
 195             $ CYVar($L1($ CYDeclaration(unique, $ CYObject()))));
 196
 197         cy::Syntax::Catch *rescue(
 198             $ cy::Syntax::Catch(cye, $$->*
 199                 $ CYIf($ CYIdentical($M($V(cye), $S("$cyk")), $V(unique)), $$->*
 200                     $ CYReturn($M($V(cye), $S("$cyv"))))->*
 201                 $ cy::Syntax::Throw($V(cye))));
 202
 203         context.Replace(declare);
 204         rescue->Replace(context);
 205
 206         statements = $$->*
 207             declare->*
 208             $ cy::Syntax::Try(statements, rescue, NULL);
 209     }
 210 }
 211
 212 CYIdentifier *CYContext::Unique() {
 213     return $ CYIdentifier($pool.strcat("$cy", $pool.itoa(unique_++), NULL));
 214 }
 215
 216 CYStatement *CYContinue::Replace(CYContext &context) {
 217     return this;
 218 }
 219
 220 CYStatement *CYDebugger::Replace(CYContext &context) {
 221     return this;
 222 }
 223
 224 CYAssignment *CYDeclaration::Assignment(CYContext &context) {
 225     if (initialiser_ == NULL)
 226         return NULL;
 227
 228     CYAssignment *value($ CYAssign(Variable(context), initialiser_));
 229     initialiser_ = NULL;
 230     return value;
 231 }
 232
 233 CYVariable *CYDeclaration::Variable(CYContext &context) {
 234     return $V(identifier_);
 235 }
 236
 237 CYStatement *CYDeclaration::ForEachIn(CYContext &context, CYExpression *value) {
 238     return $ CYVar($L1($ CYDeclaration(identifier_, value)));
 239 }
 240
 241 CYExpression *CYDeclaration::Replace(CYContext &context) {
 242     context.Replace(identifier_);
 243     context.scope_->Declare(context, identifier_, CYIdentifierVariable);
 244     return Variable(context);
 245 }
 246
 247 void CYDeclarations::Replace(CYContext &context) { $T()
 248     declaration_->Replace(context);
 249     next_->Replace(context);
 250 }
 251
 252 CYProperty *CYDeclarations::Property(CYContext &context) { $T(NULL)
 253     return $ CYProperty(declaration_->identifier_, declaration_->initialiser_, next_->Property(context));
 254 }
 255
 256 CYFunctionParameter *CYDeclarations::Parameter(CYContext &context) { $T(NULL)
 257     return $ CYFunctionParameter($ CYDeclaration(declaration_->identifier_), next_->Parameter(context));
 258 }
 259
 260 CYArgument *CYDeclarations::Argument(CYContext &context) { $T(NULL)
 261     return $ CYArgument(declaration_->initialiser_, next_->Argument(context));
 262 }
 263
 264 CYCompound *CYDeclarations::Compound(CYContext &context) { $T(NULL)
 265     CYCompound *compound(next_->Compound(context) ?: $ CYCompound());
 266     if (CYAssignment *assignment = declaration_->Assignment(context))
 267         compound->AddPrev(assignment);
 268     return compound;
 269 }
 270
 271 CYExpression *CYDirectMember::Replace(CYContext &context) {
 272     context.Replace(object_);
 273     context.Replace(property_);
 274     return this;
 275 }
 276
 277 CYStatement *CYDoWhile::Replace(CYContext &context) {
 278     context.Replace(test_);
 279     context.Replace(code_);
 280     return this;
 281 }
 282
 283 void CYElement::Replace(CYContext &context) { $T()
 284     context.Replace(value_);
 285     next_->Replace(context);
 286 }
 287
 288 CYStatement *CYEmpty::Replace(CYContext &context) {
 289     return NULL;
 290 }
 291
 292 CYExpression *CYEncodedType::Replace(CYContext &context) {
 293     return typed_->Replace(context);
 294 }
 295
 296 CYStatement *CYExpress::Replace(CYContext &context) {
 297     while (CYExpress *express = dynamic_cast<CYExpress *>(next_)) {
 298         CYCompound *compound(dynamic_cast<CYCompound *>(express->expression_));
 299         if (compound == NULL)
 300             compound = $ CYCompound(express->expression_);
 301         compound->AddPrev(expression_);
 302         expression_ = compound;
 303         SetNext(express->next_);
 304     }
 305
 306     context.Replace(expression_);
 307     if (expression_ == NULL)
 308         return $ CYEmpty();
 309
 310     return this;
 311 }
 312
 313 CYExpression *CYExpression::AddArgument(CYContext &context, CYExpression *value) {
 314     return $C1(this, value);
 315 }
 316
 317 CYExpression *CYExpression::ClassName(CYContext &context, bool object) {
 318     return this;
 319 }
 320
 321 CYStatement *CYExpression::ForEachIn(CYContext &context, CYExpression *value) {
 322     return $E($ CYAssign(this, value));
 323 }
 324
 325 CYAssignment *CYExpression::Assignment(CYContext &context) {
 326     return NULL;
 327 }
 328
 329 CYNumber *CYFalse::Number(CYContext &context) {
 330     return $D(0);
 331 }
 332
 333 CYString *CYFalse::String(CYContext &context) {
 334     return $S("false");
 335 }
 336
 337 CYExpression *CYFatArrow::Replace(CYContext &context) {
 338     CYFunctionExpression *function($ CYFunctionExpression(NULL, parameters_, code_));
 339     function->this_.SetNext(context.this_);
 340     return function;
 341 }
 342
 343 void CYFinally::Replace(CYContext &context) { $T()
 344     code_.Replace(context);
 345 }
 346
 347 CYStatement *CYFor::Replace(CYContext &context) {
 348     context.Replace(initialiser_);
 349     context.Replace(test_);
 350     context.Replace(increment_);
 351     context.Replace(code_);
 352     return this;
 353 }
 354
 355 CYCompound *CYForDeclarations::Replace(CYContext &context) {
 356     declarations_->Replace(context);
 357     return declarations_->Compound(context);
 358 }
 359
 360 // XXX: this still feels highly suboptimal
 361 CYStatement *CYForIn::Replace(CYContext &context) {
 362     if (CYAssignment *assignment = initialiser_->Assignment(context))
 363         return $ CYBlock($$->*
 364             $E(assignment)->*
 365             this
 366         );
 367
 368     context.Replace(initialiser_);
 369     context.Replace(set_);
 370     context.Replace(code_);
 371     return this;
 372 }
 373
 374 CYFunctionParameter *CYForInComprehension::Parameter(CYContext &context) const {
 375     return $ CYFunctionParameter($ CYDeclaration(name_));
 376 }
 377
 378 CYStatement *CYForInComprehension::Replace(CYContext &context, CYStatement *statement) const {
 379     return $ CYForIn($V(name_), set_, CYComprehension::Replace(context, statement));
 380 }
 381
 382 CYStatement *CYForOf::Replace(CYContext &context) {
 383     if (CYAssignment *assignment = initialiser_->Assignment(context))
 384         return $ CYBlock($$->*
 385             $E(assignment)->*
 386             this
 387         );
 388
 389     CYIdentifier *cys($I("$cys")), *cyt($I("$cyt"));
 390
 391     return $ CYLetStatement($L2($ CYDeclaration(cys, set_), $ CYDeclaration(cyt)), $$->*
 392         $ CYForIn($V(cyt), $V(cys), $ CYBlock($$->*
 393             initialiser_->ForEachIn(context, $M($V(cys), $V(cyt)))->*
 394             code_
 395         ))
 396     );
 397 }
 398
 399 CYFunctionParameter *CYForOfComprehension::Parameter(CYContext &context) const {
 400     return $ CYFunctionParameter($ CYDeclaration(name_));
 401 }
 402
 403 CYStatement *CYForOfComprehension::Replace(CYContext &context, CYStatement *statement) const {
 404     CYIdentifier *cys($I("cys"));
 405
 406     return $E($C0($F(NULL, $P1($L("$cys")), $$->*
 407         $E($ CYAssign($V(cys), set_))->*
 408         $ CYForIn($V(name_), $V(cys), $ CYBlock($$->*
 409             $E($ CYAssign($V(name_), $M($V(cys), $V(name_))))->*
 410             CYComprehension::Replace(context, statement)
 411         ))
 412     )));
 413 }
 414
 415 void CYFunction::Inject(CYContext &context) {
 416     context.Replace(name_);
 417     context.scope_->Declare(context, name_, CYIdentifierOther);
 418 }
 419
 420 void CYFunction::Replace_(CYContext &context, bool outer) {
 421     if (outer)
 422         Inject(context);
 423
 424     CYThisScope *_this(context.this_);
 425     context.this_ = CYGetLast(&this_);
 426
 427     CYNonLocal *nonlocal(context.nonlocal_);
 428     CYNonLocal *nextlocal(context.nextlocal_);
 429
 430     bool localize;
 431     if (nonlocal_ != NULL) {
 432         localize = false;
 433         context.nonlocal_ = nonlocal_;
 434     } else {
 435         localize = true;
 436         nonlocal_ = $ CYNonLocal();
 437         context.nextlocal_ = nonlocal_;
 438     }
 439
 440     CYScope scope(!localize, context, code_.statements_);
 441
 442     if (!outer && name_ != NULL)
 443         Inject(context);
 444
 445     parameters_->Replace(context, code_);
 446     code_.Replace(context);
 447
 448     if (CYIdentifier *identifier = this_.identifier_)
 449         code_.statements_ = $$->*
 450             $ CYVar($L1($ CYDeclaration(identifier, $ CYThis())))->*
 451             code_.statements_;
 452
 453     if (localize)
 454         context.NonLocal(code_.statements_);
 455
 456     context.nextlocal_ = nextlocal;
 457     context.nonlocal_ = nonlocal;
 458
 459     context.this_ = _this;
 460
 461     scope.Close();
 462 }
 463
 464 CYExpression *CYFunctionExpression::Replace(CYContext &context) {
 465     Replace_(context, false);
 466     return this;
 467 }
 468
 469 void CYFunctionParameter::Replace(CYContext &context, CYBlock &code) { $T()
 470     CYAssignment *assignment(initialiser_->Assignment(context));
 471     context.Replace(initialiser_);
 472
 473     next_->Replace(context, code);
 474
 475     if (assignment != NULL)
 476         // XXX: this cast is quite incorrect
 477         code.AddPrev($ CYIf($ CYIdentical($ CYTypeOf(dynamic_cast<CYExpression *>(initialiser_)), $S("undefined")), $$->*
 478             $E(assignment)
 479         ));
 480 }
 481
 482 CYStatement *CYFunctionStatement::Replace(CYContext &context) {
 483     Replace_(context, true);
 484     return this;
 485 }
 486
 487 CYIdentifier *CYIdentifier::Replace(CYContext &context) {
 488     if (replace_ != NULL && replace_ != this)
 489         return replace_->Replace(context);
 490     replace_ = context.scope_->Lookup(context, this);
 491     return replace_;
 492 }
 493
 494 CYStatement *CYIf::Replace(CYContext &context) {
 495     context.Replace(test_);
 496     context.Replace(true_);
 497     context.Replace(false_);
 498     return this;
 499 }
 500
 501 CYFunctionParameter *CYIfComprehension::Parameter(CYContext &context) const {
 502     return NULL;
 503 }
 504
 505 CYStatement *CYIfComprehension::Replace(CYContext &context, CYStatement *statement) const {
 506     return $ CYIf(test_, CYComprehension::Replace(context, statement));
 507 }
 508
 509 CYExpression *CYIndirect::Replace(CYContext &context) {
 510     return $M(rhs_, $S("$cyi"));
 511 }
 512
 513 CYExpression *CYIndirectMember::Replace(CYContext &context) {
 514     return $M($ CYIndirect(object_), property_);
 515 }
 516
 517 CYExpression *CYInfix::Replace(CYContext &context) {
 518     context.Replace(lhs_);
 519     context.Replace(rhs_);
 520     return this;
 521 }
 522
 523 CYStatement *CYLabel::Replace(CYContext &context) {
 524     context.Replace(statement_);
 525     return this;
 526 }
 527
 528 CYExpression *CYLambda::Replace(CYContext &context) {
 529     return $N2($V("Functor"), $ CYFunctionExpression(NULL, parameters_->Parameters(context), statements_), parameters_->TypeSignature(context, typed_->Replace(context)));
 530 }
 531
 532 CYStatement *CYLetStatement::Replace(CYContext &context) {
 533     return $E($ CYCall(CYNonLocalize(context, $ CYFunctionExpression(NULL, declarations_->Parameter(context), code_)), declarations_->Argument(context)));
 534 }
 535
 536 namespace cy {
 537 namespace Syntax {
 538
 539 CYExpression *New::AddArgument(CYContext &context, CYExpression *value) {
 540     CYSetLast(arguments_) = $ CYArgument(value);
 541     return this;
 542 }
 543
 544 CYExpression *New::Replace(CYContext &context) {
 545     context.Replace(constructor_);
 546     arguments_->Replace(context);
 547     return this;
 548 }
 549
 550 } }
 551
 552 CYNumber *CYNull::Number(CYContext &context) {
 553     return $D(0);
 554 }
 555
 556 CYString *CYNull::String(CYContext &context) {
 557     return $S("null");
 558 }
 559
 560 CYNumber *CYNumber::Number(CYContext &context) {
 561     return this;
 562 }
 563
 564 CYString *CYNumber::String(CYContext &context) {
 565     // XXX: there is a precise algorithm for this
 566     return $S($pool.sprintf(24, "%.17g", Value()));
 567 }
 568
 569 CYExpression *CYObject::Replace(CYContext &context) {
 570     properties_->Replace(context);
 571     return this;
 572 }
 573
 574 CYExpression *CYPostfix::Replace(CYContext &context) {
 575     context.Replace(lhs_);
 576     return this;
 577 }
 578
 579 CYExpression *CYPrefix::Replace(CYContext &context) {
 580     context.Replace(rhs_);
 581     return this;
 582 }
 583
 584 // XXX: this is evil evil black magic. don't ask, don't tell... don't believe!
 585 #define MappingSet "0etnirsoalfucdphmgyvbxTwSNECAFjDLkMOIBPqzRH$_WXUVGYKQJZ"
 586 //#define MappingSet "0abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ$_"
 587
 588 namespace {
 589     struct IdentifierUsageLess :
 590         std::binary_function<CYIdentifier *, CYIdentifier *, bool>
 591     {
 592         _finline bool operator ()(CYIdentifier *lhs, CYIdentifier *rhs) const {
 593             if (lhs->usage_ != rhs->usage_)
 594                 return lhs->usage_ > rhs->usage_;
 595             return lhs < rhs;
 596         }
 597     };
 598
 599     typedef std::set<CYIdentifier *, IdentifierUsageLess> IdentifierUsages;
 600 }
 601
 602 void CYProgram::Replace(CYContext &context) {
 603     CYScope scope(true, context, statements_);
 604
 605     context.nextlocal_ = $ CYNonLocal();
 606     context.ReplaceAll(statements_);
 607     context.NonLocal(statements_);
 608
 609     scope.Close();
 610
 611     size_t offset(0);
 612
 613     CYCStringSet external;
 614     for (CYIdentifierValueSet::const_iterator i(scope.identifiers_.begin()); i != scope.identifiers_.end(); ++i)
 615         external.insert((*i)->Word());
 616
 617     IdentifierUsages usages;
 618
 619     if (offset < context.rename_.size())
 620         CYForEach (i, context.rename_[offset].identifier_)
 621             usages.insert(i);
 622
 623     // XXX: totalling the probable occurrences and sorting by them would improve the result
 624     for (CYIdentifierUsageVector::const_iterator i(context.rename_.begin()); i != context.rename_.end(); ++i, ++offset) {
 625         //std::cout << *i << ":" << (*i)->offset_ << std::endl;
 626
 627         const char *name;
 628
 629         if (context.options_.verbose_)
 630             name = $pool.strcat("$", $pool.itoa(offset), NULL);
 631         else {
 632             char id[8];
 633             id[7] = '\0';
 634
 635           id:
 636             unsigned position(7), local(offset + 1);
 637
 638             do {
 639                 unsigned index(local % (sizeof(MappingSet) - 1));
 640                 local /= sizeof(MappingSet) - 1;
 641                 id[--position] = MappingSet[index];
 642             } while (local != 0);
 643
 644             if (external.find(id + position) != external.end()) {
 645                 ++offset;
 646                 goto id;
 647             }
 648
 649             name = $pool.strmemdup(id + position, 7 - position);
 650             // XXX: at some point, this could become a keyword
 651         }
 652
 653         CYForEach (identifier, i->identifier_)
 654             identifier->Set(name);
 655     }
 656 }
 657
 658 void CYProperty::Replace(CYContext &context) { $T()
 659     context.Replace(value_);
 660     next_->Replace(context);
 661     if (value_ == NULL)
 662         value_ = $U;
 663 }
 664
 665 CYStatement *CYReturn::Replace(CYContext &context) {
 666     if (context.nonlocal_ != NULL) {
 667         CYProperty *value(value_ == NULL ? NULL : $ CYProperty($S("$cyv"), value_));
 668         return $ cy::Syntax::Throw($ CYObject(
 669             $ CYProperty($S("$cyk"), $V(context.nonlocal_->Target(context)), value)
 670         ));
 671     }
 672
 673     context.Replace(value_);
 674     return this;
 675 }
 676
 677 CYExpression *CYRubyBlock::Replace(CYContext &context) {
 678     // XXX: this needs to do something much more epic to handle return
 679     return call_->AddArgument(context, proc_->Replace(context));
 680 }
 681
 682 CYExpression *CYRubyProc::Replace(CYContext &context) {
 683     return CYNonLocalize(context, $ CYFunctionExpression(NULL, parameters_, code_));
 684 }
 685
 686 CYScope::CYScope(bool transparent, CYContext &context, CYStatement *&statements) :
 687     transparent_(transparent),
 688     context_(context),
 689     statements_(statements),
 690     parent_(context.scope_)
 691 {
 692     context_.scope_ = this;
 693 }
 694
 695 CYScope::~CYScope() {
 696 }
 697
 698 void CYScope::Close() {
 699     context_.scope_ = parent_;
 700     Scope(context_, statements_);
 701 }
 702
 703 void CYScope::Declare(CYContext &context, CYIdentifier *identifier, CYIdentifierFlags flags) {
 704     if (!transparent_ || flags == CYIdentifierArgument || flags == CYIdentifierCatch)
 705         internal_.insert(CYIdentifierAddressFlagsMap::value_type(identifier, flags));
 706     else if (parent_ != NULL)
 707         parent_->Declare(context, identifier, flags);
 708 }
 709
 710 CYIdentifier *CYScope::Lookup(CYContext &context, CYIdentifier *identifier) {
 711     std::pair<CYIdentifierValueSet::iterator, bool> insert(identifiers_.insert(identifier));
 712     return *insert.first;
 713 }
 714
 715 void CYScope::Merge(CYContext &context, CYIdentifier *identifier) {
 716     std::pair<CYIdentifierValueSet::iterator, bool> insert(identifiers_.insert(identifier));
 717     if (!insert.second) {
 718         if ((*insert.first)->offset_ < identifier->offset_)
 719             (*insert.first)->offset_ = identifier->offset_;
 720         identifier->replace_ = *insert.first;
 721         (*insert.first)->usage_ += identifier->usage_ + 1;
 722     }
 723 }
 724
 725 namespace {
 726     struct IdentifierOffset {
 727         size_t offset_;
 728         CYIdentifierFlags flags_;
 729         size_t usage_;
 730         CYIdentifier *identifier_;
 731
 732         IdentifierOffset(CYIdentifier *identifier, CYIdentifierFlags flags) :
 733             offset_(identifier->offset_),
 734             flags_(flags),
 735             usage_(identifier->usage_),
 736             identifier_(identifier)
 737         {
 738         }
 739     };
 740
 741     struct IdentifierOffsetLess :
 742         std::binary_function<const IdentifierOffset &, const IdentifierOffset &, bool>
 743     {
 744         _finline bool operator ()(const IdentifierOffset &lhs, const IdentifierOffset &rhs) const {
 745             if (lhs.offset_ != rhs.offset_)
 746                 return lhs.offset_ < rhs.offset_;
 747             if (lhs.flags_ != rhs.flags_)
 748                 return lhs.flags_ < rhs.flags_;
 749             /*if (lhs.usage_ != rhs.usage_)
 750                 return lhs.usage_ < rhs.usage_;*/
 751             return lhs.identifier_ < rhs.identifier_;
 752         }
 753     };
 754
 755     typedef std::set<IdentifierOffset, IdentifierOffsetLess> IdentifierOffsets;
 756 }
 757
 758 void CYScope::Scope(CYContext &context, CYStatement *&statements) {
 759     if (parent_ == NULL)
 760         return;
 761
 762     CYDeclarations *last(NULL), *curr(NULL);
 763
 764     IdentifierOffsets offsets;
 765
 766     for (CYIdentifierAddressFlagsMap::const_iterator i(internal_.begin()); i != internal_.end(); ++i)
 767         if (i->second != CYIdentifierMagic)
 768             offsets.insert(IdentifierOffset(i->first, i->second));
 769
 770     size_t offset(0);
 771
 772     for (IdentifierOffsets::const_iterator i(offsets.begin()); i != offsets.end(); ++i) {
 773         if (i->flags_ == CYIdentifierVariable) {
 774             CYDeclarations *next($ CYDeclarations($ CYDeclaration(i->identifier_)));
 775             if (last == NULL)
 776                 last = next;
 777             if (curr != NULL)
 778                 curr->SetNext(next);
 779             curr = next;
 780         }
 781
 782         if (offset < i->offset_)
 783             offset = i->offset_;
 784         if (context.rename_.size() <= offset)
 785             context.rename_.resize(offset + 1);
 786
 787         CYIdentifierUsage &rename(context.rename_[offset++]);
 788         i->identifier_->SetNext(rename.identifier_);
 789         rename.identifier_ = i->identifier_;
 790         rename.usage_ += i->identifier_->usage_ + 1;
 791     }
 792
 793     if (last != NULL) {
 794         CYVar *var($ CYVar(last));
 795         var->SetNext(statements);
 796         statements = var;
 797     }
 798
 799     for (CYIdentifierValueSet::const_iterator i(identifiers_.begin()); i != identifiers_.end(); ++i)
 800         if (internal_.find(*i) == internal_.end()) {
 801             //std::cout << *i << '=' << offset << std::endl;
 802             if ((*i)->offset_ < offset)
 803                 (*i)->offset_ = offset;
 804             parent_->Merge(context, *i);
 805         }
 806 }
 807
 808 CYString *CYString::Concat(CYContext &context, CYString *rhs) const {
 809     size_t size(size_ + rhs->size_);
 810     char *value($ char[size + 1]);
 811     memcpy(value, value_, size_);
 812     memcpy(value + size_, rhs->value_, rhs->size_);
 813     value[size] = '\0';
 814     return $S(value, size);
 815 }
 816
 817 CYNumber *CYString::Number(CYContext &context) {
 818     // XXX: there is a precise algorithm for this
 819     return NULL;
 820 }
 821
 822 CYString *CYString::String(CYContext &context) {
 823     return this;
 824 }
 825
 826 CYStatement *CYSwitch::Replace(CYContext &context) {
 827     context.Replace(value_);
 828     clauses_->Replace(context);
 829     return this;
 830 }
 831
 832 CYExpression *CYThis::Replace(CYContext &context) {
 833     if (context.this_ != NULL)
 834         return $V(context.this_->Identifier(context));
 835     return this;
 836 }
 837
 838 namespace cy {
 839 namespace Syntax {
 840
 841 CYStatement *Throw::Replace(CYContext &context) {
 842     context.Replace(value_);
 843     return this;
 844 }
 845
 846 } }
 847
 848 CYExpression *CYTrivial::Replace(CYContext &context) {
 849     return this;
 850 }
 851
 852 CYNumber *CYTrue::Number(CYContext &context) {
 853     return $D(1);
 854 }
 855
 856 CYString *CYTrue::String(CYContext &context) {
 857     return $S("true");
 858 }
 859
 860 namespace cy {
 861 namespace Syntax {
 862
 863 CYStatement *Try::Replace(CYContext &context) {
 864     code_.Replace(context);
 865     catch_->Replace(context);
 866     finally_->Replace(context);
 867     return this;
 868 }
 869
 870 } }
 871
 872 CYExpression *CYTypeArrayOf::Replace_(CYContext &context, CYExpression *type) {
 873     return next_->Replace(context, $ CYCall($ CYDirectMember(type, $ CYString("arrayOf")), $ CYArgument(size_)));
 874 }
 875
 876 CYExpression *CYTypeBlockWith::Replace_(CYContext &context, CYExpression *type) {
 877     return next_->Replace(context, $ CYCall($ CYDirectMember(type, $ CYString("blockWith")), parameters_->Argument(context)));
 878 }
 879
 880 CYExpression *CYTypeConstant::Replace_(CYContext &context, CYExpression *type) {
 881     return next_->Replace(context, $ CYCall($ CYDirectMember(type, $ CYString("constant"))));
 882 }
 883
 884 CYStatement *CYTypeDefinition::Replace(CYContext &context) {
 885     return $E($ CYAssign($V(typed_->identifier_), typed_->Replace(context)));
 886 }
 887
 888 CYExpression *CYTypeModifier::Replace(CYContext &context, CYExpression *type) { $T(type)
 889     return Replace_(context, type);
 890 }
 891
 892 CYExpression *CYTypeFunctionWith::Replace_(CYContext &context, CYExpression *type) {
 893     return next_->Replace(context, $ CYCall($ CYDirectMember(type, $ CYString("functionWith")), parameters_->Argument(context)));
 894 }
 895
 896 CYExpression *CYTypePointerTo::Replace_(CYContext &context, CYExpression *type) {
 897     return next_->Replace(context, $ CYCall($ CYDirectMember(type, $ CYString("pointerTo"))));
 898 }
 899
 900 CYExpression *CYTypeVolatile::Replace_(CYContext &context, CYExpression *type) {
 901     return next_->Replace(context, $ CYCall($ CYDirectMember(type, $ CYString("volatile"))));
 902 }
 903
 904 CYExpression *CYTypedIdentifier::Replace(CYContext &context) {
 905     return modifier_->Replace(context, type_);
 906 }
 907
 908 CYArgument *CYTypedParameter::Argument(CYContext &context) { $T(NULL)
 909     return $ CYArgument(typed_->Replace(context), next_->Argument(context));
 910 }
 911
 912 CYFunctionParameter *CYTypedParameter::Parameters(CYContext &context) { $T(NULL)
 913     return $ CYFunctionParameter($ CYDeclaration(typed_->identifier_ ?: context.Unique()), next_->Parameters(context));
 914 }
 915
 916 CYExpression *CYTypedParameter::TypeSignature(CYContext &context, CYExpression *prefix) { $T(prefix)
 917     return next_->TypeSignature(context, $ CYAdd(prefix, typed_->type_->Replace(context)));
 918 }
 919
 920 CYStatement *CYVar::Replace(CYContext &context) {
 921     declarations_->Replace(context);
 922     return $E(declarations_->Compound(context));
 923 }
 924
 925 CYExpression *CYVariable::Replace(CYContext &context) {
 926     context.Replace(name_);
 927     return this;
 928 }
 929
 930 CYStatement *CYWhile::Replace(CYContext &context) {
 931     context.Replace(test_);
 932     context.Replace(code_);
 933     return this;
 934 }
 935
 936 CYStatement *CYWith::Replace(CYContext &context) {
 937     context.Replace(scope_);
 938     context.Replace(code_);
 939     return this;
 940 }
 941
 942 CYExpression *CYWord::ClassName(CYContext &context, bool object) {
 943     CYString *name($S(this));
 944     if (object)
 945         return $C1($V("objc_getClass"), name);
 946     else
 947         return name;
 948 }