Replace.cpp

   1 /* Cycript - Remove Execution Server and Disassembler
   2  * Copyright (C) 2009  Jay Freeman (saurik)
   3 */
   4
   5 /* Modified BSD License {{{ */
   6 /*
   7  *        Redistribution and use in source and binary
   8  * forms, with or without modification, are permitted
   9  * provided that the following conditions are met:
  10  *
  11  * 1. Redistributions of source code must retain the
  12  *    above copyright notice, this list of conditions
  13  *    and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the
  15  *    above copyright notice, this list of conditions
  16  *    and the following disclaimer in the documentation
  17  *    and/or other materials provided with the
  18  *    distribution.
  19  * 3. The name of the author may not be used to endorse
  20  *    or promote products derived from this software
  21  *    without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS''
  24  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,
  25  * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  26  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE
  28  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  29  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  30  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  31  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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  33  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
  34  * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
  35  * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
  36  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  37 */
  38 /* }}} */
  39
  40 #include "Parser.hpp"
  41
  42 #include <iomanip>
  43
  44 #include "Replace.hpp"
  45
  46 CYExpression *CYAdd::Replace(CYContext &context) {
  47     CYInfix::Replace(context);
  48
  49     CYExpression *lhp(lhs_->Primitive(context));
  50     CYExpression *rhp(rhs_->Primitive(context));
  51
  52     CYString *lhs(dynamic_cast<CYString *>(lhp));
  53     CYString *rhs(dynamic_cast<CYString *>(rhp));
  54
  55     if (lhs != NULL || rhs != NULL) {
  56         if (lhs == NULL) {
  57             lhs = lhp->String(context);
  58             if (lhs == NULL)
  59                 return NULL;
  60         } else if (rhs == NULL) {
  61             rhs = rhp->String(context);
  62             if (rhs == NULL)
  63                 return NULL;
  64         }
  65
  66         return lhs->Concat(context, rhs);
  67     }
  68
  69     if (CYNumber *lhn = lhp->Number(context))
  70         if (CYNumber *rhn = rhp->Number(context))
  71             return $D(lhn->Value() + rhn->Value());
  72
  73     return NULL;
  74 }
  75
  76 CYExpression *CYAddressOf::Replace(CYContext &context) {
  77     CYPrefix::Replace(context);
  78     return $C0($M(rhs_, $S("$cya")));
  79 }
  80
  81 void CYArgument::Replace(CYContext &context) { $T()
  82     context.Replace(value_);
  83     next_->Replace(context);
  84 }
  85
  86 CYExpression *CYArray::Replace(CYContext &context) {
  87     elements_->Replace(context);
  88     return NULL;
  89 }
  90
  91 CYExpression *CYArrayComprehension::Replace(CYContext &context) {
  92     CYVariable *cyv($V("$cyv"));
  93
  94     return $C0($F(NULL, $P1("$cyv", comprehensions_->Parameters(context)), $$->*
  95         $E($ CYAssign(cyv, $ CYArray()))->*
  96         comprehensions_->Replace(context, $E($C1($M(cyv, $S("push")), expression_)))->*
  97         $ CYReturn(cyv)
  98     ));
  99 }
 100
 101 CYExpression *CYAssignment::Replace(CYContext &context) {
 102     context.Replace(lhs_);
 103     context.Replace(rhs_);
 104     return NULL;
 105 }
 106
 107 CYStatement *CYBlock::Replace(CYContext &context) {
 108     statements_ = statements_->ReplaceAll(context);
 109     return NULL;
 110 }
 111
 112 CYStatement *CYBreak::Replace(CYContext &context) {
 113     return NULL;
 114 }
 115
 116 CYExpression *CYCall::Replace(CYContext &context) {
 117     context.Replace(function_);
 118     arguments_->Replace(context);
 119     return NULL;
 120 }
 121
 122 namespace cy {
 123 namespace Syntax {
 124
 125 void Catch::Replace(CYContext &context) { $T()
 126     code_.Replace(context);
 127 }
 128
 129 } }
 130
 131 void CYClause::Replace(CYContext &context) { $T()
 132     context.Replace(case_);
 133     statements_ = statements_->ReplaceAll(context);
 134     next_->Replace(context);
 135 }
 136
 137 CYExpression *CYCompound::Replace(CYContext &context) {
 138     expressions_ = expressions_->ReplaceAll(context);
 139     return NULL;
 140 }
 141
 142 CYFunctionParameter *CYComprehension::Parameters(CYContext &context) const { $T(NULL)
 143     CYFunctionParameter *next(next_->Parameters(context));
 144     if (CYFunctionParameter *parameter = Parameter(context)) {
 145         parameter->SetNext(next);
 146         return parameter;
 147     } else
 148         return next;
 149 }
 150
 151 CYStatement *CYComprehension::Replace(CYContext &context, CYStatement *statement) const {
 152     return next_ == NULL ? statement : next_->Replace(context, statement);
 153 }
 154
 155 CYExpression *CYCondition::Replace(CYContext &context) {
 156     context.Replace(test_);
 157     context.Replace(true_);
 158     context.Replace(false_);
 159     return NULL;
 160 }
 161
 162 CYStatement *CYContinue::Replace(CYContext &context) {
 163     return NULL;
 164 }
 165
 166 CYExpression *CYDeclaration::ForEachIn(CYContext &context) {
 167     return $ CYVariable(identifier_);
 168 }
 169
 170 void CYDeclaration::Replace(CYContext &context) {
 171     context.Replace(initialiser_);
 172 }
 173
 174 CYProperty *CYDeclarations::Property(CYContext &context) { $T(NULL)
 175     return $ CYProperty(declaration_->identifier_, declaration_->initialiser_ ?: $U, next_->Property(context));
 176 }
 177
 178 void CYDeclarations::Replace(CYContext &context) { $T()
 179     declaration_->Replace(context);
 180     next_->Replace(context);
 181 }
 182
 183 CYExpression *CYDirectMember::Replace(CYContext &context) {
 184     Replace_(context);
 185     return NULL;
 186 }
 187
 188 CYStatement *CYDoWhile::Replace(CYContext &context) {
 189     context.Replace(test_);
 190     context.Replace(code_);
 191     return NULL;
 192 }
 193
 194 void CYElement::Replace(CYContext &context) { $T()
 195     context.Replace(value_);
 196     next_->Replace(context);
 197 }
 198
 199 CYStatement *CYEmpty::Replace(CYContext &context) {
 200     return NULL;
 201 }
 202
 203 CYStatement *CYExpress::Replace(CYContext &context) {
 204     context.Replace(expression_);
 205     return NULL;
 206 }
 207
 208 CYExpression *CYExpression::ClassName(CYContext &context, bool object) {
 209     return this;
 210 }
 211
 212 CYExpression *CYExpression::ForEachIn(CYContext &context) {
 213     return this;
 214 }
 215
 216 CYExpression *CYExpression::ReplaceAll(CYContext &context) { $T(NULL)
 217     CYExpression *replace(this);
 218     context.Replace(replace);
 219
 220     if (CYExpression *next = next_->ReplaceAll(context))
 221         replace->SetNext(next);
 222     else
 223         replace->SetNext(next_);
 224
 225     return replace;
 226 }
 227
 228 CYNumber *CYFalse::Number(CYContext &context) {
 229     return $D(0);
 230 }
 231
 232 CYString *CYFalse::String(CYContext &context) {
 233     return $S("false");
 234 }
 235
 236 void CYFinally::Replace(CYContext &context) { $T()
 237     code_.Replace(context);
 238 }
 239
 240 CYStatement *CYFor::Replace(CYContext &context) {
 241     // XXX: initialiser_
 242     context.Replace(test_);
 243     context.Replace(increment_);
 244     context.Replace(code_);
 245     return NULL;
 246 }
 247
 248 CYStatement *CYForIn::Replace(CYContext &context) {
 249     // XXX: initialiser_
 250     context.Replace(set_);
 251     context.Replace(code_);
 252     return NULL;
 253 }
 254
 255 CYFunctionParameter *CYForInComprehension::Parameter(CYContext &context) const {
 256     return $ CYFunctionParameter(name_);
 257 }
 258
 259 CYStatement *CYForInComprehension::Replace(CYContext &context, CYStatement *statement) const {
 260     return $ CYForIn($ CYVariable(name_), set_, CYComprehension::Replace(context, statement));
 261 }
 262
 263 CYStatement *CYForEachIn::Replace(CYContext &context) {
 264     CYVariable *cys($V("$cys")), *cyt($V("$cyt"));
 265
 266     return $ CYLet($L2($L($I("$cys"), set_), $L($I("$cyt"))), $$->*
 267         $ CYForIn(cyt, cys, $ CYBlock($$->*
 268             $E($ CYAssign(initialiser_->ForEachIn(context), $M(cys, cyt)))->*
 269             code_
 270         ))
 271     );
 272 }
 273
 274 CYFunctionParameter *CYForEachInComprehension::Parameter(CYContext &context) const {
 275     return $ CYFunctionParameter(name_);
 276 }
 277
 278 CYStatement *CYForEachInComprehension::Replace(CYContext &context, CYStatement *statement) const {
 279     CYVariable *cys($V("$cys")), *name($ CYVariable(name_));
 280
 281     return $E($C0($F(NULL, $P1("$cys"), $$->*
 282         $E($ CYAssign(cys, set_))->*
 283         $ CYForIn(name, cys, $ CYBlock($$->*
 284             $E($ CYAssign(name, $M(cys, name)))->*
 285             CYComprehension::Replace(context, statement)
 286         ))
 287     )));
 288 }
 289
 290 void CYFunction::Replace_(CYContext &context) {
 291     code_.Replace(context);
 292 }
 293
 294 CYExpression *CYFunctionExpression::Replace(CYContext &context) {
 295     Replace_(context);
 296     return NULL;
 297 }
 298
 299 CYStatement *CYFunctionStatement::Replace(CYContext &context) {
 300     Replace_(context);
 301     return NULL;
 302 }
 303
 304 CYStatement *CYIf::Replace(CYContext &context) {
 305     context.Replace(test_);
 306     context.Replace(true_);
 307     context.Replace(false_);
 308     return NULL;
 309 }
 310
 311 CYFunctionParameter *CYIfComprehension::Parameter(CYContext &context) const {
 312     return NULL;
 313 }
 314
 315 CYStatement *CYIfComprehension::Replace(CYContext &context, CYStatement *statement) const {
 316     return $ CYIf(test_, CYComprehension::Replace(context, statement));
 317 }
 318
 319 CYExpression *CYIndirect::Replace(CYContext &context) {
 320     CYPrefix::Replace(context);
 321     return $M(rhs_, $S("$cyi"));
 322 }
 323
 324 CYExpression *CYIndirectMember::Replace(CYContext &context) {
 325     Replace_(context);
 326     return $M($ CYIndirect(object_), property_);
 327 }
 328
 329 CYExpression *CYInfix::Replace(CYContext &context) {
 330     context.Replace(lhs_);
 331     context.Replace(rhs_);
 332     return NULL;
 333 }
 334
 335 CYStatement *CYLabel::Replace(CYContext &context) {
 336     context.Replace(statement_);
 337     return NULL;
 338 }
 339
 340 CYStatement *CYLet::Replace(CYContext &context) {
 341     return $ CYWith($ CYObject(declarations_->Property(context)), &code_);
 342 }
 343
 344 void CYMember::Replace_(CYContext &context) {
 345     context.Replace(object_);
 346     context.Replace(property_);
 347 }
 348
 349 CYExpression *CYNew::Replace(CYContext &context) {
 350     context.Replace(constructor_);
 351     arguments_->Replace(context);
 352     return NULL;
 353 }
 354
 355 CYNumber *CYNull::Number(CYContext &context) {
 356     return $D(0);
 357 }
 358
 359 CYString *CYNull::String(CYContext &context) {
 360     return $S("null");
 361 }
 362
 363 CYNumber *CYNumber::Number(CYContext &context) {
 364     return this;
 365 }
 366
 367 CYString *CYNumber::String(CYContext &context) {
 368     // XXX: there is a precise algorithm for this
 369     return $S(apr_psprintf(context.pool_, "%.17g", Value()));
 370 }
 371
 372 CYExpression *CYObject::Replace(CYContext &context) {
 373     properties_->Replace(context);
 374     return NULL;
 375 }
 376
 377 CYExpression *CYPostfix::Replace(CYContext &context) {
 378     context.Replace(lhs_);
 379     return NULL;
 380 }
 381
 382 CYExpression *CYPrefix::Replace(CYContext &context) {
 383     context.Replace(rhs_);
 384     return NULL;
 385 }
 386
 387 void CYProgram::Replace(CYContext &context) {
 388     statements_ = statements_->ReplaceAll(context);
 389 }
 390
 391 void CYProperty::Replace(CYContext &context) { $T()
 392     context.Replace(value_);
 393     next_->Replace(context);
 394 }
 395
 396 CYStatement *CYReturn::Replace(CYContext &context) {
 397     context.Replace(value_);
 398     return NULL;
 399 }
 400
 401 CYStatement *CYStatement::ReplaceAll(CYContext &context) { $T(NULL)
 402     CYStatement *replace(this);
 403     context.Replace(replace);
 404
 405     if (CYStatement *next = next_->ReplaceAll(context))
 406         replace->SetNext(next);
 407     else
 408         replace->SetNext(next_);
 409
 410     return replace;
 411 }
 412
 413 CYString *CYString::Concat(CYContext &context, CYString *rhs) const {
 414     size_t size(size_ + rhs->size_);
 415     char *value(new(context.pool_) char[size + 1]);
 416     memcpy(value, value_, size_);
 417     memcpy(value + size_, rhs->value_, rhs->size_);
 418     value[size] = '\0';
 419     return $S(value);
 420 }
 421
 422 CYNumber *CYString::Number(CYContext &context) {
 423     // XXX: there is a precise algorithm for this
 424     return NULL;
 425 }
 426
 427 CYString *CYString::String(CYContext &context) {
 428     return this;
 429 }
 430
 431 CYStatement *CYSwitch::Replace(CYContext &context) {
 432     context.Replace(value_);
 433     clauses_->Replace(context);
 434     return NULL;
 435 }
 436
 437 CYExpression *CYThis::Replace(CYContext &context) {
 438     return NULL;
 439 }
 440
 441 namespace cy {
 442 namespace Syntax {
 443
 444 CYStatement *Throw::Replace(CYContext &context) {
 445     context.Replace(value_);
 446     return NULL;
 447 }
 448
 449 } }
 450
 451 CYExpression *CYTrivial::Replace(CYContext &context) {
 452     return NULL;
 453 }
 454
 455 CYNumber *CYTrue::Number(CYContext &context) {
 456     return $D(1);
 457 }
 458
 459 CYString *CYTrue::String(CYContext &context) {
 460     return $S("true");
 461 }
 462
 463 namespace cy {
 464 namespace Syntax {
 465
 466 CYStatement *Try::Replace(CYContext &context) {
 467     code_.Replace(context);
 468     catch_->Replace(context);
 469     finally_->Replace(context);
 470     return NULL;
 471 }
 472
 473 } }
 474
 475 CYStatement *CYVar::Replace(CYContext &context) {
 476     declarations_->Replace(context);
 477     return NULL;
 478 }
 479
 480 CYExpression *CYVariable::Replace(CYContext &context) {
 481     return NULL;
 482 }
 483
 484 CYStatement *CYWhile::Replace(CYContext &context) {
 485     context.Replace(test_);
 486     context.Replace(code_);
 487     return NULL;
 488 }
 489
 490 CYStatement *CYWith::Replace(CYContext &context) {
 491     context.Replace(scope_);
 492     context.Replace(code_);
 493     return NULL;
 494 }
 495
 496 CYExpression *CYWord::ClassName(CYContext &context, bool object) {
 497     CYString *name($S(this));
 498     if (object)
 499         return $C1($V("objc_getClass"), name);
 500     else
 501         return name;
 502 }