base/values.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "base/values.h"
   6
   7 #include <string.h>
   8
   9 #include <algorithm>
  10 #include <cmath>
  11 #include <ostream>
  12
  13 #include "base/json/json_writer.h"
  14 #include "base/logging.h"
  15 #include "base/move.h"
  16 #include "base/strings/string_util.h"
  17 #include "base/strings/utf_string_conversions.h"
  18
  19 namespace base {
  20
  21 namespace {
  22
  23 scoped_ptr<Value> CopyWithoutEmptyChildren(const Value& node);
  24
  25 // Make a deep copy of |node|, but don't include empty lists or dictionaries
  26 // in the copy. It's possible for this function to return NULL and it
  27 // expects |node| to always be non-NULL.
  28 scoped_ptr<ListValue> CopyListWithoutEmptyChildren(const ListValue& list) {
  29   scoped_ptr<ListValue> copy;
  30   for (ListValue::const_iterator it = list.begin(); it != list.end(); ++it) {
  31     scoped_ptr<Value> child_copy = CopyWithoutEmptyChildren(**it);
  32     if (child_copy) {
  33       if (!copy)
  34         copy.reset(new ListValue);
  35       copy->Append(child_copy.Pass());
  36     }
  37   }
  38   return copy;
  39 }
  40
  41 scoped_ptr<DictionaryValue> CopyDictionaryWithoutEmptyChildren(
  42     const DictionaryValue& dict) {
  43   scoped_ptr<DictionaryValue> copy;
  44   for (DictionaryValue::Iterator it(dict); !it.IsAtEnd(); it.Advance()) {
  45     scoped_ptr<Value> child_copy = CopyWithoutEmptyChildren(it.value());
  46     if (child_copy) {
  47       if (!copy)
  48         copy.reset(new DictionaryValue);
  49       copy->SetWithoutPathExpansion(it.key(), child_copy.Pass());
  50     }
  51   }
  52   return copy;
  53 }
  54
  55 scoped_ptr<Value> CopyWithoutEmptyChildren(const Value& node) {
  56   switch (node.GetType()) {
  57     case Value::TYPE_LIST:
  58       return CopyListWithoutEmptyChildren(static_cast<const ListValue&>(node));
  59
  60     case Value::TYPE_DICTIONARY:
  61       return CopyDictionaryWithoutEmptyChildren(
  62           static_cast<const DictionaryValue&>(node));
  63
  64     default:
  65       return node.CreateDeepCopy();
  66   }
  67 }
  68
  69 // A small functor for comparing Values for std::find_if and similar.
  70 class ValueEquals {
  71  public:
  72   // Pass the value against which all consecutive calls of the () operator will
  73   // compare their argument to. This Value object must not be destroyed while
  74   // the ValueEquals is  in use.
  75   explicit ValueEquals(const Value* first) : first_(first) { }
  76
  77   bool operator ()(const Value* second) const {
  78     return first_->Equals(second);
  79   }
  80
  81  private:
  82   const Value* first_;
  83 };
  84
  85 }  // namespace
  86
  87 Value::~Value() {
  88 }
  89
  90 // static
  91 scoped_ptr<Value> Value::CreateNullValue() {
  92   return make_scoped_ptr(new Value(TYPE_NULL));
  93 }
  94
  95 bool Value::GetAsBinary(const BinaryValue** out_value) const {
  96   return false;
  97 }
  98
  99 bool Value::GetAsBoolean(bool* out_value) const {
 100   return false;
 101 }
 102
 103 bool Value::GetAsInteger(int* out_value) const {
 104   return false;
 105 }
 106
 107 bool Value::GetAsDouble(double* out_value) const {
 108   return false;
 109 }
 110
 111 bool Value::GetAsString(std::string* out_value) const {
 112   return false;
 113 }
 114
 115 bool Value::GetAsString(string16* out_value) const {
 116   return false;
 117 }
 118
 119 bool Value::GetAsString(const StringValue** out_value) const {
 120   return false;
 121 }
 122
 123 bool Value::GetAsList(ListValue** out_value) {
 124   return false;
 125 }
 126
 127 bool Value::GetAsList(const ListValue** out_value) const {
 128   return false;
 129 }
 130
 131 bool Value::GetAsDictionary(DictionaryValue** out_value) {
 132   return false;
 133 }
 134
 135 bool Value::GetAsDictionary(const DictionaryValue** out_value) const {
 136   return false;
 137 }
 138
 139 Value* Value::DeepCopy() const {
 140   // This method should only be getting called for null Values--all subclasses
 141   // need to provide their own implementation;.
 142   DCHECK(IsType(TYPE_NULL));
 143   return CreateNullValue().release();
 144 }
 145
 146 scoped_ptr<Value> Value::CreateDeepCopy() const {
 147   return make_scoped_ptr(DeepCopy());
 148 }
 149
 150 bool Value::Equals(const Value* other) const {
 151   // This method should only be getting called for null Values--all subclasses
 152   // need to provide their own implementation;.
 153   DCHECK(IsType(TYPE_NULL));
 154   return other->IsType(TYPE_NULL);
 155 }
 156
 157 // static
 158 bool Value::Equals(const Value* a, const Value* b) {
 159   if ((a == NULL) && (b == NULL)) return true;
 160   if ((a == NULL) ^  (b == NULL)) return false;
 161   return a->Equals(b);
 162 }
 163
 164 Value::Value(Type type) : type_(type) {}
 165
 166 Value::Value(const Value& that) : type_(that.type_) {}
 167
 168 Value& Value::operator=(const Value& that) {
 169   type_ = that.type_;
 170   return *this;
 171 }
 172
 173 ///////////////////// FundamentalValue ////////////////////
 174
 175 FundamentalValue::FundamentalValue(bool in_value)
 176     : Value(TYPE_BOOLEAN), boolean_value_(in_value) {
 177 }
 178
 179 FundamentalValue::FundamentalValue(int in_value)
 180     : Value(TYPE_INTEGER), integer_value_(in_value) {
 181 }
 182
 183 FundamentalValue::FundamentalValue(double in_value)
 184     : Value(TYPE_DOUBLE), double_value_(in_value) {
 185   if (!std::isfinite(double_value_)) {
 186     NOTREACHED() << "Non-finite (i.e. NaN or positive/negative infinity) "
 187                  << "values cannot be represented in JSON";
 188     double_value_ = 0.0;
 189   }
 190 }
 191
 192 FundamentalValue::~FundamentalValue() {
 193 }
 194
 195 bool FundamentalValue::GetAsBoolean(bool* out_value) const {
 196   if (out_value && IsType(TYPE_BOOLEAN))
 197     *out_value = boolean_value_;
 198   return (IsType(TYPE_BOOLEAN));
 199 }
 200
 201 bool FundamentalValue::GetAsInteger(int* out_value) const {
 202   if (out_value && IsType(TYPE_INTEGER))
 203     *out_value = integer_value_;
 204   return (IsType(TYPE_INTEGER));
 205 }
 206
 207 bool FundamentalValue::GetAsDouble(double* out_value) const {
 208   if (out_value && IsType(TYPE_DOUBLE))
 209     *out_value = double_value_;
 210   else if (out_value && IsType(TYPE_INTEGER))
 211     *out_value = integer_value_;
 212   return (IsType(TYPE_DOUBLE) || IsType(TYPE_INTEGER));
 213 }
 214
 215 FundamentalValue* FundamentalValue::DeepCopy() const {
 216   switch (GetType()) {
 217     case TYPE_BOOLEAN:
 218       return new FundamentalValue(boolean_value_);
 219
 220     case TYPE_INTEGER:
 221       return new FundamentalValue(integer_value_);
 222
 223     case TYPE_DOUBLE:
 224       return new FundamentalValue(double_value_);
 225
 226     default:
 227       NOTREACHED();
 228       return NULL;
 229   }
 230 }
 231
 232 bool FundamentalValue::Equals(const Value* other) const {
 233   if (other->GetType() != GetType())
 234     return false;
 235
 236   switch (GetType()) {
 237     case TYPE_BOOLEAN: {
 238       bool lhs, rhs;
 239       return GetAsBoolean(&lhs) && other->GetAsBoolean(&rhs) && lhs == rhs;
 240     }
 241     case TYPE_INTEGER: {
 242       int lhs, rhs;
 243       return GetAsInteger(&lhs) && other->GetAsInteger(&rhs) && lhs == rhs;
 244     }
 245     case TYPE_DOUBLE: {
 246       double lhs, rhs;
 247       return GetAsDouble(&lhs) && other->GetAsDouble(&rhs) && lhs == rhs;
 248     }
 249     default:
 250       NOTREACHED();
 251       return false;
 252   }
 253 }
 254
 255 ///////////////////// StringValue ////////////////////
 256
 257 StringValue::StringValue(const std::string& in_value)
 258     : Value(TYPE_STRING),
 259       value_(in_value) {
 260   DCHECK(IsStringUTF8(in_value));
 261 }
 262
 263 StringValue::StringValue(const string16& in_value)
 264     : Value(TYPE_STRING),
 265       value_(UTF16ToUTF8(in_value)) {
 266 }
 267
 268 StringValue::~StringValue() {
 269 }
 270
 271 std::string* StringValue::GetString() {
 272   return &value_;
 273 }
 274
 275 const std::string& StringValue::GetString() const {
 276   return value_;
 277 }
 278
 279 bool StringValue::GetAsString(std::string* out_value) const {
 280   if (out_value)
 281     *out_value = value_;
 282   return true;
 283 }
 284
 285 bool StringValue::GetAsString(string16* out_value) const {
 286   if (out_value)
 287     *out_value = UTF8ToUTF16(value_);
 288   return true;
 289 }
 290
 291 bool StringValue::GetAsString(const StringValue** out_value) const {
 292   if (out_value)
 293     *out_value = this;
 294   return true;
 295 }
 296
 297 StringValue* StringValue::DeepCopy() const {
 298   return new StringValue(value_);
 299 }
 300
 301 bool StringValue::Equals(const Value* other) const {
 302   if (other->GetType() != GetType())
 303     return false;
 304   std::string lhs, rhs;
 305   return GetAsString(&lhs) && other->GetAsString(&rhs) && lhs == rhs;
 306 }
 307
 308 ///////////////////// BinaryValue ////////////////////
 309
 310 BinaryValue::BinaryValue()
 311     : Value(TYPE_BINARY),
 312       size_(0) {
 313 }
 314
 315 BinaryValue::BinaryValue(scoped_ptr<char[]> buffer, size_t size)
 316     : Value(TYPE_BINARY),
 317       buffer_(buffer.Pass()),
 318       size_(size) {
 319 }
 320
 321 BinaryValue::~BinaryValue() {
 322 }
 323
 324 // static
 325 BinaryValue* BinaryValue::CreateWithCopiedBuffer(const char* buffer,
 326                                                  size_t size) {
 327   char* buffer_copy = new char[size];
 328   memcpy(buffer_copy, buffer, size);
 329   scoped_ptr<char[]> scoped_buffer_copy(buffer_copy);
 330   return new BinaryValue(scoped_buffer_copy.Pass(), size);
 331 }
 332
 333 bool BinaryValue::GetAsBinary(const BinaryValue** out_value) const {
 334   if (out_value)
 335     *out_value = this;
 336   return true;
 337 }
 338
 339 BinaryValue* BinaryValue::DeepCopy() const {
 340   return CreateWithCopiedBuffer(buffer_.get(), size_);
 341 }
 342
 343 bool BinaryValue::Equals(const Value* other) const {
 344   if (other->GetType() != GetType())
 345     return false;
 346   const BinaryValue* other_binary = static_cast<const BinaryValue*>(other);
 347   if (other_binary->size_ != size_)
 348     return false;
 349   return !memcmp(GetBuffer(), other_binary->GetBuffer(), size_);
 350 }
 351
 352 ///////////////////// DictionaryValue ////////////////////
 353
 354 DictionaryValue::DictionaryValue()
 355     : Value(TYPE_DICTIONARY) {
 356 }
 357
 358 DictionaryValue::~DictionaryValue() {
 359   Clear();
 360 }
 361
 362 bool DictionaryValue::GetAsDictionary(DictionaryValue** out_value) {
 363   if (out_value)
 364     *out_value = this;
 365   return true;
 366 }
 367
 368 bool DictionaryValue::GetAsDictionary(const DictionaryValue** out_value) const {
 369   if (out_value)
 370     *out_value = this;
 371   return true;
 372 }
 373
 374 bool DictionaryValue::HasKey(const std::string& key) const {
 375   DCHECK(IsStringUTF8(key));
 376   ValueMap::const_iterator current_entry = dictionary_.find(key);
 377   DCHECK((current_entry == dictionary_.end()) || current_entry->second);
 378   return current_entry != dictionary_.end();
 379 }
 380
 381 void DictionaryValue::Clear() {
 382   ValueMap::iterator dict_iterator = dictionary_.begin();
 383   while (dict_iterator != dictionary_.end()) {
 384     delete dict_iterator->second;
 385     ++dict_iterator;
 386   }
 387
 388   dictionary_.clear();
 389 }
 390
 391 void DictionaryValue::Set(const std::string& path, scoped_ptr<Value> in_value) {
 392   DCHECK(IsStringUTF8(path));
 393   DCHECK(in_value);
 394
 395   std::string current_path(path);
 396   DictionaryValue* current_dictionary = this;
 397   for (size_t delimiter_position = current_path.find('.');
 398        delimiter_position != std::string::npos;
 399        delimiter_position = current_path.find('.')) {
 400     // Assume that we're indexing into a dictionary.
 401     std::string key(current_path, 0, delimiter_position);
 402     DictionaryValue* child_dictionary = NULL;
 403     if (!current_dictionary->GetDictionary(key, &child_dictionary)) {
 404       child_dictionary = new DictionaryValue;
 405       current_dictionary->SetWithoutPathExpansion(key, child_dictionary);
 406     }
 407
 408     current_dictionary = child_dictionary;
 409     current_path.erase(0, delimiter_position + 1);
 410   }
 411
 412   current_dictionary->SetWithoutPathExpansion(current_path, in_value.Pass());
 413 }
 414
 415 void DictionaryValue::Set(const std::string& path, Value* in_value) {
 416   Set(path, make_scoped_ptr(in_value));
 417 }
 418
 419 void DictionaryValue::SetBoolean(const std::string& path, bool in_value) {
 420   Set(path, new FundamentalValue(in_value));
 421 }
 422
 423 void DictionaryValue::SetInteger(const std::string& path, int in_value) {
 424   Set(path, new FundamentalValue(in_value));
 425 }
 426
 427 void DictionaryValue::SetDouble(const std::string& path, double in_value) {
 428   Set(path, new FundamentalValue(in_value));
 429 }
 430
 431 void DictionaryValue::SetString(const std::string& path,
 432                                 const std::string& in_value) {
 433   Set(path, new StringValue(in_value));
 434 }
 435
 436 void DictionaryValue::SetString(const std::string& path,
 437                                 const string16& in_value) {
 438   Set(path, new StringValue(in_value));
 439 }
 440
 441 void DictionaryValue::SetWithoutPathExpansion(const std::string& key,
 442                                               scoped_ptr<Value> in_value) {
 443   Value* bare_ptr = in_value.release();
 444   // If there's an existing value here, we need to delete it, because
 445   // we own all our children.
 446   std::pair<ValueMap::iterator, bool> ins_res =
 447       dictionary_.insert(std::make_pair(key, bare_ptr));
 448   if (!ins_res.second) {
 449     DCHECK_NE(ins_res.first->second, bare_ptr);  // This would be bogus
 450     delete ins_res.first->second;
 451     ins_res.first->second = bare_ptr;
 452   }
 453 }
 454
 455 void DictionaryValue::SetWithoutPathExpansion(const std::string& key,
 456                                               Value* in_value) {
 457   SetWithoutPathExpansion(key, make_scoped_ptr(in_value));
 458 }
 459
 460 void DictionaryValue::SetBooleanWithoutPathExpansion(
 461     const std::string& path, bool in_value) {
 462   SetWithoutPathExpansion(path, new FundamentalValue(in_value));
 463 }
 464
 465 void DictionaryValue::SetIntegerWithoutPathExpansion(
 466     const std::string& path, int in_value) {
 467   SetWithoutPathExpansion(path, new FundamentalValue(in_value));
 468 }
 469
 470 void DictionaryValue::SetDoubleWithoutPathExpansion(
 471     const std::string& path, double in_value) {
 472   SetWithoutPathExpansion(path, new FundamentalValue(in_value));
 473 }
 474
 475 void DictionaryValue::SetStringWithoutPathExpansion(
 476     const std::string& path, const std::string& in_value) {
 477   SetWithoutPathExpansion(path, new StringValue(in_value));
 478 }
 479
 480 void DictionaryValue::SetStringWithoutPathExpansion(
 481     const std::string& path, const string16& in_value) {
 482   SetWithoutPathExpansion(path, new StringValue(in_value));
 483 }
 484
 485 bool DictionaryValue::Get(const std::string& path,
 486                           const Value** out_value) const {
 487   DCHECK(IsStringUTF8(path));
 488   std::string current_path(path);
 489   const DictionaryValue* current_dictionary = this;
 490   for (size_t delimiter_position = current_path.find('.');
 491        delimiter_position != std::string::npos;
 492        delimiter_position = current_path.find('.')) {
 493     const DictionaryValue* child_dictionary = NULL;
 494     if (!current_dictionary->GetDictionary(
 495             current_path.substr(0, delimiter_position), &child_dictionary))
 496       return false;
 497
 498     current_dictionary = child_dictionary;
 499     current_path.erase(0, delimiter_position + 1);
 500   }
 501
 502   return current_dictionary->GetWithoutPathExpansion(current_path, out_value);
 503 }
 504
 505 bool DictionaryValue::Get(const std::string& path, Value** out_value)  {
 506   return static_cast<const DictionaryValue&>(*this).Get(
 507       path,
 508       const_cast<const Value**>(out_value));
 509 }
 510
 511 bool DictionaryValue::GetBoolean(const std::string& path,
 512                                  bool* bool_value) const {
 513   const Value* value;
 514   if (!Get(path, &value))
 515     return false;
 516
 517   return value->GetAsBoolean(bool_value);
 518 }
 519
 520 bool DictionaryValue::GetInteger(const std::string& path,
 521                                  int* out_value) const {
 522   const Value* value;
 523   if (!Get(path, &value))
 524     return false;
 525
 526   return value->GetAsInteger(out_value);
 527 }
 528
 529 bool DictionaryValue::GetDouble(const std::string& path,
 530                                 double* out_value) const {
 531   const Value* value;
 532   if (!Get(path, &value))
 533     return false;
 534
 535   return value->GetAsDouble(out_value);
 536 }
 537
 538 bool DictionaryValue::GetString(const std::string& path,
 539                                 std::string* out_value) const {
 540   const Value* value;
 541   if (!Get(path, &value))
 542     return false;
 543
 544   return value->GetAsString(out_value);
 545 }
 546
 547 bool DictionaryValue::GetString(const std::string& path,
 548                                 string16* out_value) const {
 549   const Value* value;
 550   if (!Get(path, &value))
 551     return false;
 552
 553   return value->GetAsString(out_value);
 554 }
 555
 556 bool DictionaryValue::GetStringASCII(const std::string& path,
 557                                      std::string* out_value) const {
 558   std::string out;
 559   if (!GetString(path, &out))
 560     return false;
 561
 562   if (!IsStringASCII(out)) {
 563     NOTREACHED();
 564     return false;
 565   }
 566
 567   out_value->assign(out);
 568   return true;
 569 }
 570
 571 bool DictionaryValue::GetBinary(const std::string& path,
 572                                 const BinaryValue** out_value) const {
 573   const Value* value;
 574   bool result = Get(path, &value);
 575   if (!result || !value->IsType(TYPE_BINARY))
 576     return false;
 577
 578   if (out_value)
 579     *out_value = static_cast<const BinaryValue*>(value);
 580
 581   return true;
 582 }
 583
 584 bool DictionaryValue::GetBinary(const std::string& path,
 585                                 BinaryValue** out_value) {
 586   return static_cast<const DictionaryValue&>(*this).GetBinary(
 587       path,
 588       const_cast<const BinaryValue**>(out_value));
 589 }
 590
 591 bool DictionaryValue::GetDictionary(const std::string& path,
 592                                     const DictionaryValue** out_value) const {
 593   const Value* value;
 594   bool result = Get(path, &value);
 595   if (!result || !value->IsType(TYPE_DICTIONARY))
 596     return false;
 597
 598   if (out_value)
 599     *out_value = static_cast<const DictionaryValue*>(value);
 600
 601   return true;
 602 }
 603
 604 bool DictionaryValue::GetDictionary(const std::string& path,
 605                                     DictionaryValue** out_value) {
 606   return static_cast<const DictionaryValue&>(*this).GetDictionary(
 607       path,
 608       const_cast<const DictionaryValue**>(out_value));
 609 }
 610
 611 bool DictionaryValue::GetList(const std::string& path,
 612                               const ListValue** out_value) const {
 613   const Value* value;
 614   bool result = Get(path, &value);
 615   if (!result || !value->IsType(TYPE_LIST))
 616     return false;
 617
 618   if (out_value)
 619     *out_value = static_cast<const ListValue*>(value);
 620
 621   return true;
 622 }
 623
 624 bool DictionaryValue::GetList(const std::string& path, ListValue** out_value) {
 625   return static_cast<const DictionaryValue&>(*this).GetList(
 626       path,
 627       const_cast<const ListValue**>(out_value));
 628 }
 629
 630 bool DictionaryValue::GetWithoutPathExpansion(const std::string& key,
 631                                               const Value** out_value) const {
 632   DCHECK(IsStringUTF8(key));
 633   ValueMap::const_iterator entry_iterator = dictionary_.find(key);
 634   if (entry_iterator == dictionary_.end())
 635     return false;
 636
 637   const Value* entry = entry_iterator->second;
 638   if (out_value)
 639     *out_value = entry;
 640   return true;
 641 }
 642
 643 bool DictionaryValue::GetWithoutPathExpansion(const std::string& key,
 644                                               Value** out_value) {
 645   return static_cast<const DictionaryValue&>(*this).GetWithoutPathExpansion(
 646       key,
 647       const_cast<const Value**>(out_value));
 648 }
 649
 650 bool DictionaryValue::GetBooleanWithoutPathExpansion(const std::string& key,
 651                                                      bool* out_value) const {
 652   const Value* value;
 653   if (!GetWithoutPathExpansion(key, &value))
 654     return false;
 655
 656   return value->GetAsBoolean(out_value);
 657 }
 658
 659 bool DictionaryValue::GetIntegerWithoutPathExpansion(const std::string& key,
 660                                                      int* out_value) const {
 661   const Value* value;
 662   if (!GetWithoutPathExpansion(key, &value))
 663     return false;
 664
 665   return value->GetAsInteger(out_value);
 666 }
 667
 668 bool DictionaryValue::GetDoubleWithoutPathExpansion(const std::string& key,
 669                                                     double* out_value) const {
 670   const Value* value;
 671   if (!GetWithoutPathExpansion(key, &value))
 672     return false;
 673
 674   return value->GetAsDouble(out_value);
 675 }
 676
 677 bool DictionaryValue::GetStringWithoutPathExpansion(
 678     const std::string& key,
 679     std::string* out_value) const {
 680   const Value* value;
 681   if (!GetWithoutPathExpansion(key, &value))
 682     return false;
 683
 684   return value->GetAsString(out_value);
 685 }
 686
 687 bool DictionaryValue::GetStringWithoutPathExpansion(const std::string& key,
 688                                                     string16* out_value) const {
 689   const Value* value;
 690   if (!GetWithoutPathExpansion(key, &value))
 691     return false;
 692
 693   return value->GetAsString(out_value);
 694 }
 695
 696 bool DictionaryValue::GetDictionaryWithoutPathExpansion(
 697     const std::string& key,
 698     const DictionaryValue** out_value) const {
 699   const Value* value;
 700   bool result = GetWithoutPathExpansion(key, &value);
 701   if (!result || !value->IsType(TYPE_DICTIONARY))
 702     return false;
 703
 704   if (out_value)
 705     *out_value = static_cast<const DictionaryValue*>(value);
 706
 707   return true;
 708 }
 709
 710 bool DictionaryValue::GetDictionaryWithoutPathExpansion(
 711     const std::string& key,
 712     DictionaryValue** out_value) {
 713   const DictionaryValue& const_this =
 714       static_cast<const DictionaryValue&>(*this);
 715   return const_this.GetDictionaryWithoutPathExpansion(
 716           key,
 717           const_cast<const DictionaryValue**>(out_value));
 718 }
 719
 720 bool DictionaryValue::GetListWithoutPathExpansion(
 721     const std::string& key,
 722     const ListValue** out_value) const {
 723   const Value* value;
 724   bool result = GetWithoutPathExpansion(key, &value);
 725   if (!result || !value->IsType(TYPE_LIST))
 726     return false;
 727
 728   if (out_value)
 729     *out_value = static_cast<const ListValue*>(value);
 730
 731   return true;
 732 }
 733
 734 bool DictionaryValue::GetListWithoutPathExpansion(const std::string& key,
 735                                                   ListValue** out_value) {
 736   return
 737       static_cast<const DictionaryValue&>(*this).GetListWithoutPathExpansion(
 738           key,
 739           const_cast<const ListValue**>(out_value));
 740 }
 741
 742 bool DictionaryValue::Remove(const std::string& path,
 743                              scoped_ptr<Value>* out_value) {
 744   DCHECK(IsStringUTF8(path));
 745   std::string current_path(path);
 746   DictionaryValue* current_dictionary = this;
 747   size_t delimiter_position = current_path.rfind('.');
 748   if (delimiter_position != std::string::npos) {
 749     if (!GetDictionary(current_path.substr(0, delimiter_position),
 750                        &current_dictionary))
 751       return false;
 752     current_path.erase(0, delimiter_position + 1);
 753   }
 754
 755   return current_dictionary->RemoveWithoutPathExpansion(current_path,
 756                                                         out_value);
 757 }
 758
 759 bool DictionaryValue::RemoveWithoutPathExpansion(const std::string& key,
 760                                                  scoped_ptr<Value>* out_value) {
 761   DCHECK(IsStringUTF8(key));
 762   ValueMap::iterator entry_iterator = dictionary_.find(key);
 763   if (entry_iterator == dictionary_.end())
 764     return false;
 765
 766   Value* entry = entry_iterator->second;
 767   if (out_value)
 768     out_value->reset(entry);
 769   else
 770     delete entry;
 771   dictionary_.erase(entry_iterator);
 772   return true;
 773 }
 774
 775 bool DictionaryValue::RemovePath(const std::string& path,
 776                                  scoped_ptr<Value>* out_value) {
 777   bool result = false;
 778   size_t delimiter_position = path.find('.');
 779
 780   if (delimiter_position == std::string::npos)
 781     return RemoveWithoutPathExpansion(path, out_value);
 782
 783   const std::string subdict_path = path.substr(0, delimiter_position);
 784   DictionaryValue* subdict = NULL;
 785   if (!GetDictionary(subdict_path, &subdict))
 786     return false;
 787   result = subdict->RemovePath(path.substr(delimiter_position + 1),
 788                                out_value);
 789   if (result && subdict->empty())
 790     RemoveWithoutPathExpansion(subdict_path, NULL);
 791
 792   return result;
 793 }
 794
 795 scoped_ptr<DictionaryValue> DictionaryValue::DeepCopyWithoutEmptyChildren()
 796     const {
 797   scoped_ptr<DictionaryValue> copy = CopyDictionaryWithoutEmptyChildren(*this);
 798   if (!copy)
 799     copy.reset(new DictionaryValue);
 800   return copy;
 801 }
 802
 803 void DictionaryValue::MergeDictionary(const DictionaryValue* dictionary) {
 804   for (DictionaryValue::Iterator it(*dictionary); !it.IsAtEnd(); it.Advance()) {
 805     const Value* merge_value = &it.value();
 806     // Check whether we have to merge dictionaries.
 807     if (merge_value->IsType(Value::TYPE_DICTIONARY)) {
 808       DictionaryValue* sub_dict;
 809       if (GetDictionaryWithoutPathExpansion(it.key(), &sub_dict)) {
 810         sub_dict->MergeDictionary(
 811             static_cast<const DictionaryValue*>(merge_value));
 812         continue;
 813       }
 814     }
 815     // All other cases: Make a copy and hook it up.
 816     SetWithoutPathExpansion(it.key(), merge_value->DeepCopy());
 817   }
 818 }
 819
 820 void DictionaryValue::Swap(DictionaryValue* other) {
 821   dictionary_.swap(other->dictionary_);
 822 }
 823
 824 DictionaryValue::Iterator::Iterator(const DictionaryValue& target)
 825     : target_(target),
 826       it_(target.dictionary_.begin()) {}
 827
 828 DictionaryValue::Iterator::~Iterator() {}
 829
 830 DictionaryValue* DictionaryValue::DeepCopy() const {
 831   DictionaryValue* result = new DictionaryValue;
 832
 833   for (ValueMap::const_iterator current_entry(dictionary_.begin());
 834        current_entry != dictionary_.end(); ++current_entry) {
 835     result->SetWithoutPathExpansion(current_entry->first,
 836                                     current_entry->second->DeepCopy());
 837   }
 838
 839   return result;
 840 }
 841
 842 scoped_ptr<DictionaryValue> DictionaryValue::CreateDeepCopy() const {
 843   return make_scoped_ptr(DeepCopy());
 844 }
 845
 846 bool DictionaryValue::Equals(const Value* other) const {
 847   if (other->GetType() != GetType())
 848     return false;
 849
 850   const DictionaryValue* other_dict =
 851       static_cast<const DictionaryValue*>(other);
 852   Iterator lhs_it(*this);
 853   Iterator rhs_it(*other_dict);
 854   while (!lhs_it.IsAtEnd() && !rhs_it.IsAtEnd()) {
 855     if (lhs_it.key() != rhs_it.key() ||
 856         !lhs_it.value().Equals(&rhs_it.value())) {
 857       return false;
 858     }
 859     lhs_it.Advance();
 860     rhs_it.Advance();
 861   }
 862   if (!lhs_it.IsAtEnd() || !rhs_it.IsAtEnd())
 863     return false;
 864
 865   return true;
 866 }
 867
 868 ///////////////////// ListValue ////////////////////
 869
 870 ListValue::ListValue() : Value(TYPE_LIST) {
 871 }
 872
 873 ListValue::~ListValue() {
 874   Clear();
 875 }
 876
 877 void ListValue::Clear() {
 878   for (ValueVector::iterator i(list_.begin()); i != list_.end(); ++i)
 879     delete *i;
 880   list_.clear();
 881 }
 882
 883 bool ListValue::Set(size_t index, Value* in_value) {
 884   if (!in_value)
 885     return false;
 886
 887   if (index >= list_.size()) {
 888     // Pad out any intermediate indexes with null settings
 889     while (index > list_.size())
 890       Append(CreateNullValue());
 891     Append(in_value);
 892   } else {
 893     DCHECK(list_[index] != in_value);
 894     delete list_[index];
 895     list_[index] = in_value;
 896   }
 897   return true;
 898 }
 899
 900 bool ListValue::Set(size_t index, scoped_ptr<Value> in_value) {
 901   return Set(index, in_value.release());
 902 }
 903
 904 bool ListValue::Get(size_t index, const Value** out_value) const {
 905   if (index >= list_.size())
 906     return false;
 907
 908   if (out_value)
 909     *out_value = list_[index];
 910
 911   return true;
 912 }
 913
 914 bool ListValue::Get(size_t index, Value** out_value) {
 915   return static_cast<const ListValue&>(*this).Get(
 916       index,
 917       const_cast<const Value**>(out_value));
 918 }
 919
 920 bool ListValue::GetBoolean(size_t index, bool* bool_value) const {
 921   const Value* value;
 922   if (!Get(index, &value))
 923     return false;
 924
 925   return value->GetAsBoolean(bool_value);
 926 }
 927
 928 bool ListValue::GetInteger(size_t index, int* out_value) const {
 929   const Value* value;
 930   if (!Get(index, &value))
 931     return false;
 932
 933   return value->GetAsInteger(out_value);
 934 }
 935
 936 bool ListValue::GetDouble(size_t index, double* out_value) const {
 937   const Value* value;
 938   if (!Get(index, &value))
 939     return false;
 940
 941   return value->GetAsDouble(out_value);
 942 }
 943
 944 bool ListValue::GetString(size_t index, std::string* out_value) const {
 945   const Value* value;
 946   if (!Get(index, &value))
 947     return false;
 948
 949   return value->GetAsString(out_value);
 950 }
 951
 952 bool ListValue::GetString(size_t index, string16* out_value) const {
 953   const Value* value;
 954   if (!Get(index, &value))
 955     return false;
 956
 957   return value->GetAsString(out_value);
 958 }
 959
 960 bool ListValue::GetBinary(size_t index, const BinaryValue** out_value) const {
 961   const Value* value;
 962   bool result = Get(index, &value);
 963   if (!result || !value->IsType(TYPE_BINARY))
 964     return false;
 965
 966   if (out_value)
 967     *out_value = static_cast<const BinaryValue*>(value);
 968
 969   return true;
 970 }
 971
 972 bool ListValue::GetBinary(size_t index, BinaryValue** out_value) {
 973   return static_cast<const ListValue&>(*this).GetBinary(
 974       index,
 975       const_cast<const BinaryValue**>(out_value));
 976 }
 977
 978 bool ListValue::GetDictionary(size_t index,
 979                               const DictionaryValue** out_value) const {
 980   const Value* value;
 981   bool result = Get(index, &value);
 982   if (!result || !value->IsType(TYPE_DICTIONARY))
 983     return false;
 984
 985   if (out_value)
 986     *out_value = static_cast<const DictionaryValue*>(value);
 987
 988   return true;
 989 }
 990
 991 bool ListValue::GetDictionary(size_t index, DictionaryValue** out_value) {
 992   return static_cast<const ListValue&>(*this).GetDictionary(
 993       index,
 994       const_cast<const DictionaryValue**>(out_value));
 995 }
 996
 997 bool ListValue::GetList(size_t index, const ListValue** out_value) const {
 998   const Value* value;
 999   bool result = Get(index, &value);
1000   if (!result || !value->IsType(TYPE_LIST))
1001     return false;
1002
1003   if (out_value)
1004     *out_value = static_cast<const ListValue*>(value);
1005
1006   return true;
1007 }
1008
1009 bool ListValue::GetList(size_t index, ListValue** out_value) {
1010   return static_cast<const ListValue&>(*this).GetList(
1011       index,
1012       const_cast<const ListValue**>(out_value));
1013 }
1014
1015 bool ListValue::Remove(size_t index, scoped_ptr<Value>* out_value) {
1016   if (index >= list_.size())
1017     return false;
1018
1019   if (out_value)
1020     out_value->reset(list_[index]);
1021   else
1022     delete list_[index];
1023
1024   list_.erase(list_.begin() + index);
1025   return true;
1026 }
1027
1028 bool ListValue::Remove(const Value& value, size_t* index) {
1029   for (ValueVector::iterator i(list_.begin()); i != list_.end(); ++i) {
1030     if ((*i)->Equals(&value)) {
1031       size_t previous_index = i - list_.begin();
1032       delete *i;
1033       list_.erase(i);
1034
1035       if (index)
1036         *index = previous_index;
1037       return true;
1038     }
1039   }
1040   return false;
1041 }
1042
1043 ListValue::iterator ListValue::Erase(iterator iter,
1044                                      scoped_ptr<Value>* out_value) {
1045   if (out_value)
1046     out_value->reset(*iter);
1047   else
1048     delete *iter;
1049
1050   return list_.erase(iter);
1051 }
1052
1053 void ListValue::Append(scoped_ptr<Value> in_value) {
1054   Append(in_value.release());
1055 }
1056
1057 void ListValue::Append(Value* in_value) {
1058   DCHECK(in_value);
1059   list_.push_back(in_value);
1060 }
1061
1062 void ListValue::AppendBoolean(bool in_value) {
1063   Append(new FundamentalValue(in_value));
1064 }
1065
1066 void ListValue::AppendInteger(int in_value) {
1067   Append(new FundamentalValue(in_value));
1068 }
1069
1070 void ListValue::AppendDouble(double in_value) {
1071   Append(new FundamentalValue(in_value));
1072 }
1073
1074 void ListValue::AppendString(const std::string& in_value) {
1075   Append(new StringValue(in_value));
1076 }
1077
1078 void ListValue::AppendString(const string16& in_value) {
1079   Append(new StringValue(in_value));
1080 }
1081
1082 void ListValue::AppendStrings(const std::vector<std::string>& in_values) {
1083   for (std::vector<std::string>::const_iterator it = in_values.begin();
1084        it != in_values.end(); ++it) {
1085     AppendString(*it);
1086   }
1087 }
1088
1089 void ListValue::AppendStrings(const std::vector<string16>& in_values) {
1090   for (std::vector<string16>::const_iterator it = in_values.begin();
1091        it != in_values.end(); ++it) {
1092     AppendString(*it);
1093   }
1094 }
1095
1096 bool ListValue::AppendIfNotPresent(Value* in_value) {
1097   DCHECK(in_value);
1098   for (ValueVector::const_iterator i(list_.begin()); i != list_.end(); ++i) {
1099     if ((*i)->Equals(in_value)) {
1100       delete in_value;
1101       return false;
1102     }
1103   }
1104   list_.push_back(in_value);
1105   return true;
1106 }
1107
1108 bool ListValue::Insert(size_t index, Value* in_value) {
1109   DCHECK(in_value);
1110   if (index > list_.size())
1111     return false;
1112
1113   list_.insert(list_.begin() + index, in_value);
1114   return true;
1115 }
1116
1117 ListValue::const_iterator ListValue::Find(const Value& value) const {
1118   return std::find_if(list_.begin(), list_.end(), ValueEquals(&value));
1119 }
1120
1121 void ListValue::Swap(ListValue* other) {
1122   list_.swap(other->list_);
1123 }
1124
1125 bool ListValue::GetAsList(ListValue** out_value) {
1126   if (out_value)
1127     *out_value = this;
1128   return true;
1129 }
1130
1131 bool ListValue::GetAsList(const ListValue** out_value) const {
1132   if (out_value)
1133     *out_value = this;
1134   return true;
1135 }
1136
1137 ListValue* ListValue::DeepCopy() const {
1138   ListValue* result = new ListValue;
1139
1140   for (ValueVector::const_iterator i(list_.begin()); i != list_.end(); ++i)
1141     result->Append((*i)->DeepCopy());
1142
1143   return result;
1144 }
1145
1146 scoped_ptr<ListValue> ListValue::CreateDeepCopy() const {
1147   return make_scoped_ptr(DeepCopy());
1148 }
1149
1150 bool ListValue::Equals(const Value* other) const {
1151   if (other->GetType() != GetType())
1152     return false;
1153
1154   const ListValue* other_list =
1155       static_cast<const ListValue*>(other);
1156   const_iterator lhs_it, rhs_it;
1157   for (lhs_it = begin(), rhs_it = other_list->begin();
1158        lhs_it != end() && rhs_it != other_list->end();
1159        ++lhs_it, ++rhs_it) {
1160     if (!(*lhs_it)->Equals(*rhs_it))
1161       return false;
1162   }
1163   if (lhs_it != end() || rhs_it != other_list->end())
1164     return false;
1165
1166   return true;
1167 }
1168
1169 ValueSerializer::~ValueSerializer() {
1170 }
1171
1172 ValueDeserializer::~ValueDeserializer() {
1173 }
1174
1175 std::ostream& operator<<(std::ostream& out, const Value& value) {
1176   std::string json;
1177   JSONWriter::WriteWithOptions(value, JSONWriter::OPTIONS_PRETTY_PRINT, &json);
1178   return out << json;
1179 }
1180
1181 }  // namespace base