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 <ostream>
  11
  12 #include "base/float_util.h"
  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 // Make a deep copy of |node|, but don't include empty lists or dictionaries
  24 // in the copy. It's possible for this function to return NULL and it
  25 // expects |node| to always be non-NULL.
  26 Value* CopyWithoutEmptyChildren(const Value* node) {
  27   DCHECK(node);
  28   switch (node->GetType()) {
  29     case Value::TYPE_LIST: {
  30       const ListValue* list = static_cast<const ListValue*>(node);
  31       ListValue* copy = new ListValue;
  32       for (ListValue::const_iterator it = list->begin(); it != list->end();
  33            ++it) {
  34         Value* child_copy = CopyWithoutEmptyChildren(*it);
  35         if (child_copy)
  36           copy->Append(child_copy);
  37       }
  38       if (!copy->empty())
  39         return copy;
  40
  41       delete copy;
  42       return NULL;
  43     }
  44
  45     case Value::TYPE_DICTIONARY: {
  46       const DictionaryValue* dict = static_cast<const DictionaryValue*>(node);
  47       DictionaryValue* copy = new DictionaryValue;
  48       for (DictionaryValue::Iterator it(*dict); !it.IsAtEnd(); it.Advance()) {
  49         Value* child_copy = CopyWithoutEmptyChildren(&it.value());
  50         if (child_copy)
  51           copy->SetWithoutPathExpansion(it.key(), child_copy);
  52       }
  53       if (!copy->empty())
  54         return copy;
  55
  56       delete copy;
  57       return NULL;
  58     }
  59
  60     default:
  61       // For everything else, just make a copy.
  62       return node->DeepCopy();
  63   }
  64 }
  65
  66 // A small functor for comparing Values for std::find_if and similar.
  67 class ValueEquals {
  68  public:
  69   // Pass the value against which all consecutive calls of the () operator will
  70   // compare their argument to. This Value object must not be destroyed while
  71   // the ValueEquals is  in use.
  72   explicit ValueEquals(const Value* first) : first_(first) { }
  73
  74   bool operator ()(const Value* second) const {
  75     return first_->Equals(second);
  76   }
  77
  78  private:
  79   const Value* first_;
  80 };
  81
  82 }  // namespace
  83
  84 Value::~Value() {
  85 }
  86
  87 // static
  88 Value* Value::CreateNullValue() {
  89   return new Value(TYPE_NULL);
  90 }
  91
  92 // static
  93 FundamentalValue* Value::CreateBooleanValue(bool in_value) {
  94   return new FundamentalValue(in_value);
  95 }
  96
  97 // static
  98 FundamentalValue* Value::CreateIntegerValue(int in_value) {
  99   return new FundamentalValue(in_value);
 100 }
 101
 102 // static
 103 FundamentalValue* Value::CreateDoubleValue(double in_value) {
 104   return new FundamentalValue(in_value);
 105 }
 106
 107 // static
 108 StringValue* Value::CreateStringValue(const std::string& in_value) {
 109   return new StringValue(in_value);
 110 }
 111
 112 // static
 113 StringValue* Value::CreateStringValue(const string16& in_value) {
 114   return new StringValue(in_value);
 115 }
 116
 117 bool Value::GetAsBoolean(bool* out_value) const {
 118   return false;
 119 }
 120
 121 bool Value::GetAsInteger(int* out_value) const {
 122   return false;
 123 }
 124
 125 bool Value::GetAsDouble(double* out_value) const {
 126   return false;
 127 }
 128
 129 bool Value::GetAsString(std::string* out_value) const {
 130   return false;
 131 }
 132
 133 bool Value::GetAsString(string16* out_value) const {
 134   return false;
 135 }
 136
 137 bool Value::GetAsList(ListValue** out_value) {
 138   return false;
 139 }
 140
 141 bool Value::GetAsList(const ListValue** out_value) const {
 142   return false;
 143 }
 144
 145 bool Value::GetAsDictionary(DictionaryValue** out_value) {
 146   return false;
 147 }
 148
 149 bool Value::GetAsDictionary(const DictionaryValue** out_value) const {
 150   return false;
 151 }
 152
 153 Value* Value::DeepCopy() const {
 154   // This method should only be getting called for null Values--all subclasses
 155   // need to provide their own implementation;.
 156   DCHECK(IsType(TYPE_NULL));
 157   return CreateNullValue();
 158 }
 159
 160 bool Value::Equals(const Value* other) const {
 161   // This method should only be getting called for null Values--all subclasses
 162   // need to provide their own implementation;.
 163   DCHECK(IsType(TYPE_NULL));
 164   return other->IsType(TYPE_NULL);
 165 }
 166
 167 // static
 168 bool Value::Equals(const Value* a, const Value* b) {
 169   if ((a == NULL) && (b == NULL)) return true;
 170   if ((a == NULL) ^  (b == NULL)) return false;
 171   return a->Equals(b);
 172 }
 173
 174 Value::Value(Type type) : type_(type) {}
 175
 176 Value::Value(const Value& that) : type_(that.type_) {}
 177
 178 Value& Value::operator=(const Value& that) {
 179   type_ = that.type_;
 180   return *this;
 181 }
 182
 183 ///////////////////// FundamentalValue ////////////////////
 184
 185 FundamentalValue::FundamentalValue(bool in_value)
 186     : Value(TYPE_BOOLEAN), boolean_value_(in_value) {
 187 }
 188
 189 FundamentalValue::FundamentalValue(int in_value)
 190     : Value(TYPE_INTEGER), integer_value_(in_value) {
 191 }
 192
 193 FundamentalValue::FundamentalValue(double in_value)
 194     : Value(TYPE_DOUBLE), double_value_(in_value) {
 195   if (!IsFinite(double_value_)) {
 196     NOTREACHED() << "Non-finite (i.e. NaN or positive/negative infinity) "
 197                  << "values cannot be represented in JSON";
 198     double_value_ = 0.0;
 199   }
 200 }
 201
 202 FundamentalValue::~FundamentalValue() {
 203 }
 204
 205 bool FundamentalValue::GetAsBoolean(bool* out_value) const {
 206   if (out_value && IsType(TYPE_BOOLEAN))
 207     *out_value = boolean_value_;
 208   return (IsType(TYPE_BOOLEAN));
 209 }
 210
 211 bool FundamentalValue::GetAsInteger(int* out_value) const {
 212   if (out_value && IsType(TYPE_INTEGER))
 213     *out_value = integer_value_;
 214   return (IsType(TYPE_INTEGER));
 215 }
 216
 217 bool FundamentalValue::GetAsDouble(double* out_value) const {
 218   if (out_value && IsType(TYPE_DOUBLE))
 219     *out_value = double_value_;
 220   else if (out_value && IsType(TYPE_INTEGER))
 221     *out_value = integer_value_;
 222   return (IsType(TYPE_DOUBLE) || IsType(TYPE_INTEGER));
 223 }
 224
 225 FundamentalValue* FundamentalValue::DeepCopy() const {
 226   switch (GetType()) {
 227     case TYPE_BOOLEAN:
 228       return CreateBooleanValue(boolean_value_);
 229
 230     case TYPE_INTEGER:
 231       return CreateIntegerValue(integer_value_);
 232
 233     case TYPE_DOUBLE:
 234       return CreateDoubleValue(double_value_);
 235
 236     default:
 237       NOTREACHED();
 238       return NULL;
 239   }
 240 }
 241
 242 bool FundamentalValue::Equals(const Value* other) const {
 243   if (other->GetType() != GetType())
 244     return false;
 245
 246   switch (GetType()) {
 247     case TYPE_BOOLEAN: {
 248       bool lhs, rhs;
 249       return GetAsBoolean(&lhs) && other->GetAsBoolean(&rhs) && lhs == rhs;
 250     }
 251     case TYPE_INTEGER: {
 252       int lhs, rhs;
 253       return GetAsInteger(&lhs) && other->GetAsInteger(&rhs) && lhs == rhs;
 254     }
 255     case TYPE_DOUBLE: {
 256       double lhs, rhs;
 257       return GetAsDouble(&lhs) && other->GetAsDouble(&rhs) && lhs == rhs;
 258     }
 259     default:
 260       NOTREACHED();
 261       return false;
 262   }
 263 }
 264
 265 ///////////////////// StringValue ////////////////////
 266
 267 StringValue::StringValue(const std::string& in_value)
 268     : Value(TYPE_STRING),
 269       value_(in_value) {
 270   DCHECK(IsStringUTF8(in_value));
 271 }
 272
 273 StringValue::StringValue(const string16& in_value)
 274     : Value(TYPE_STRING),
 275       value_(UTF16ToUTF8(in_value)) {
 276 }
 277
 278 StringValue::~StringValue() {
 279 }
 280
 281 bool StringValue::GetAsString(std::string* out_value) const {
 282   if (out_value)
 283     *out_value = value_;
 284   return true;
 285 }
 286
 287 bool StringValue::GetAsString(string16* out_value) const {
 288   if (out_value)
 289     *out_value = UTF8ToUTF16(value_);
 290   return true;
 291 }
 292
 293 StringValue* StringValue::DeepCopy() const {
 294   return CreateStringValue(value_);
 295 }
 296
 297 bool StringValue::Equals(const Value* other) const {
 298   if (other->GetType() != GetType())
 299     return false;
 300   std::string lhs, rhs;
 301   return GetAsString(&lhs) && other->GetAsString(&rhs) && lhs == rhs;
 302 }
 303
 304 ///////////////////// BinaryValue ////////////////////
 305
 306 BinaryValue::BinaryValue()
 307     : Value(TYPE_BINARY),
 308       size_(0) {
 309 }
 310
 311 BinaryValue::BinaryValue(scoped_ptr<char[]> buffer, size_t size)
 312     : Value(TYPE_BINARY),
 313       buffer_(buffer.Pass()),
 314       size_(size) {
 315 }
 316
 317 BinaryValue::~BinaryValue() {
 318 }
 319
 320 // static
 321 BinaryValue* BinaryValue::CreateWithCopiedBuffer(const char* buffer,
 322                                                  size_t size) {
 323   char* buffer_copy = new char[size];
 324   memcpy(buffer_copy, buffer, size);
 325   scoped_ptr<char[]> scoped_buffer_copy(buffer_copy);
 326   return new BinaryValue(scoped_buffer_copy.Pass(), size);
 327 }
 328
 329 BinaryValue* BinaryValue::DeepCopy() const {
 330   return CreateWithCopiedBuffer(buffer_.get(), size_);
 331 }
 332
 333 bool BinaryValue::Equals(const Value* other) const {
 334   if (other->GetType() != GetType())
 335     return false;
 336   const BinaryValue* other_binary = static_cast<const BinaryValue*>(other);
 337   if (other_binary->size_ != size_)
 338     return false;
 339   return !memcmp(GetBuffer(), other_binary->GetBuffer(), size_);
 340 }
 341
 342 ///////////////////// DictionaryValue ////////////////////
 343
 344 DictionaryValue::DictionaryValue()
 345     : Value(TYPE_DICTIONARY) {
 346 }
 347
 348 DictionaryValue::~DictionaryValue() {
 349   Clear();
 350 }
 351
 352 bool DictionaryValue::GetAsDictionary(DictionaryValue** out_value) {
 353   if (out_value)
 354     *out_value = this;
 355   return true;
 356 }
 357
 358 bool DictionaryValue::GetAsDictionary(const DictionaryValue** out_value) const {
 359   if (out_value)
 360     *out_value = this;
 361   return true;
 362 }
 363
 364 bool DictionaryValue::HasKey(const std::string& key) const {
 365   DCHECK(IsStringUTF8(key));
 366   ValueMap::const_iterator current_entry = dictionary_.find(key);
 367   DCHECK((current_entry == dictionary_.end()) || current_entry->second);
 368   return current_entry != dictionary_.end();
 369 }
 370
 371 void DictionaryValue::Clear() {
 372   ValueMap::iterator dict_iterator = dictionary_.begin();
 373   while (dict_iterator != dictionary_.end()) {
 374     delete dict_iterator->second;
 375     ++dict_iterator;
 376   }
 377
 378   dictionary_.clear();
 379 }
 380
 381 void DictionaryValue::Set(const std::string& path, Value* in_value) {
 382   DCHECK(IsStringUTF8(path));
 383   DCHECK(in_value);
 384
 385   std::string current_path(path);
 386   DictionaryValue* current_dictionary = this;
 387   for (size_t delimiter_position = current_path.find('.');
 388        delimiter_position != std::string::npos;
 389        delimiter_position = current_path.find('.')) {
 390     // Assume that we're indexing into a dictionary.
 391     std::string key(current_path, 0, delimiter_position);
 392     DictionaryValue* child_dictionary = NULL;
 393     if (!current_dictionary->GetDictionary(key, &child_dictionary)) {
 394       child_dictionary = new DictionaryValue;
 395       current_dictionary->SetWithoutPathExpansion(key, child_dictionary);
 396     }
 397
 398     current_dictionary = child_dictionary;
 399     current_path.erase(0, delimiter_position + 1);
 400   }
 401
 402   current_dictionary->SetWithoutPathExpansion(current_path, in_value);
 403 }
 404
 405 void DictionaryValue::SetBoolean(const std::string& path, bool in_value) {
 406   Set(path, CreateBooleanValue(in_value));
 407 }
 408
 409 void DictionaryValue::SetInteger(const std::string& path, int in_value) {
 410   Set(path, CreateIntegerValue(in_value));
 411 }
 412
 413 void DictionaryValue::SetDouble(const std::string& path, double in_value) {
 414   Set(path, CreateDoubleValue(in_value));
 415 }
 416
 417 void DictionaryValue::SetString(const std::string& path,
 418                                 const std::string& in_value) {
 419   Set(path, CreateStringValue(in_value));
 420 }
 421
 422 void DictionaryValue::SetString(const std::string& path,
 423                                 const string16& in_value) {
 424   Set(path, CreateStringValue(in_value));
 425 }
 426
 427 void DictionaryValue::SetWithoutPathExpansion(const std::string& key,
 428                                               Value* in_value) {
 429   // If there's an existing value here, we need to delete it, because
 430   // we own all our children.
 431   std::pair<ValueMap::iterator, bool> ins_res =
 432       dictionary_.insert(std::make_pair(key, in_value));
 433   if (!ins_res.second) {
 434     DCHECK_NE(ins_res.first->second, in_value);  // This would be bogus
 435     delete ins_res.first->second;
 436     ins_res.first->second = in_value;
 437   }
 438 }
 439
 440 void DictionaryValue::SetBooleanWithoutPathExpansion(
 441     const std::string& path, bool in_value) {
 442   SetWithoutPathExpansion(path, CreateBooleanValue(in_value));
 443 }
 444
 445 void DictionaryValue::SetIntegerWithoutPathExpansion(
 446     const std::string& path, int in_value) {
 447   SetWithoutPathExpansion(path, CreateIntegerValue(in_value));
 448 }
 449
 450 void DictionaryValue::SetDoubleWithoutPathExpansion(
 451     const std::string& path, double in_value) {
 452   SetWithoutPathExpansion(path, CreateDoubleValue(in_value));
 453 }
 454
 455 void DictionaryValue::SetStringWithoutPathExpansion(
 456     const std::string& path, const std::string& in_value) {
 457   SetWithoutPathExpansion(path, CreateStringValue(in_value));
 458 }
 459
 460 void DictionaryValue::SetStringWithoutPathExpansion(
 461     const std::string& path, const string16& in_value) {
 462   SetWithoutPathExpansion(path, CreateStringValue(in_value));
 463 }
 464
 465 bool DictionaryValue::Get(
 466     const std::string& path, const Value** out_value) const {
 467   DCHECK(IsStringUTF8(path));
 468 //  LOG(WARNING) << "\n1\n";
 469   std::string current_path(path);
 470   const DictionaryValue* current_dictionary = this;
 471 //  LOG(WARNING) << "\n2\n";
 472   for (size_t delimiter_position = current_path.find('.');
 473        delimiter_position != std::string::npos;
 474        delimiter_position = current_path.find('.')) {
 475     const DictionaryValue* child_dictionary = NULL;
 476     if (!current_dictionary->GetDictionary(
 477             current_path.substr(0, delimiter_position), &child_dictionary))
 478       return false;
 479
 480     current_dictionary = child_dictionary;
 481     current_path.erase(0, delimiter_position + 1);
 482   }
 483 //  LOG(WARNING) << "\n3\n";
 484
 485   return current_dictionary->GetWithoutPathExpansion(current_path, out_value);
 486 }
 487
 488 bool DictionaryValue::Get(const std::string& path, Value** out_value)  {
 489   return static_cast<const DictionaryValue&>(*this).Get(
 490       path,
 491       const_cast<const Value**>(out_value));
 492 }
 493
 494 bool DictionaryValue::GetBoolean(const std::string& path,
 495                                  bool* bool_value) const {
 496   const Value* value;
 497   if (!Get(path, &value))
 498     return false;
 499
 500   return value->GetAsBoolean(bool_value);
 501 }
 502
 503 bool DictionaryValue::GetInteger(const std::string& path,
 504                                  int* out_value) const {
 505   const Value* value;
 506   if (!Get(path, &value))
 507     return false;
 508
 509   return value->GetAsInteger(out_value);
 510 }
 511
 512 bool DictionaryValue::GetDouble(const std::string& path,
 513                                 double* out_value) const {
 514   const Value* value;
 515   if (!Get(path, &value))
 516     return false;
 517
 518   return value->GetAsDouble(out_value);
 519 }
 520
 521 bool DictionaryValue::GetString(const std::string& path,
 522                                 std::string* out_value) const {
 523   const Value* value;
 524   if (!Get(path, &value))
 525     return false;
 526
 527   return value->GetAsString(out_value);
 528 }
 529
 530 bool DictionaryValue::GetString(const std::string& path,
 531                                 string16* out_value) const {
 532   const Value* value;
 533   if (!Get(path, &value))
 534     return false;
 535
 536   return value->GetAsString(out_value);
 537 }
 538
 539 bool DictionaryValue::GetStringASCII(const std::string& path,
 540                                      std::string* out_value) const {
 541   std::string out;
 542   if (!GetString(path, &out))
 543     return false;
 544
 545   if (!IsStringASCII(out)) {
 546     NOTREACHED();
 547     return false;
 548   }
 549
 550   out_value->assign(out);
 551   return true;
 552 }
 553
 554 bool DictionaryValue::GetBinary(const std::string& path,
 555                                 const BinaryValue** out_value) const {
 556   const Value* value;
 557   bool result = Get(path, &value);
 558   if (!result || !value->IsType(TYPE_BINARY))
 559     return false;
 560
 561   if (out_value)
 562     *out_value = static_cast<const BinaryValue*>(value);
 563
 564   return true;
 565 }
 566
 567 bool DictionaryValue::GetBinary(const std::string& path,
 568                                 BinaryValue** out_value) {
 569   return static_cast<const DictionaryValue&>(*this).GetBinary(
 570       path,
 571       const_cast<const BinaryValue**>(out_value));
 572 }
 573
 574 bool DictionaryValue::GetDictionary(const std::string& path,
 575                                     const DictionaryValue** out_value) const {
 576   const Value* value;
 577   bool result = Get(path, &value);
 578   if (!result || !value->IsType(TYPE_DICTIONARY))
 579     return false;
 580
 581   if (out_value)
 582     *out_value = static_cast<const DictionaryValue*>(value);
 583
 584   return true;
 585 }
 586
 587 bool DictionaryValue::GetDictionary(const std::string& path,
 588                                     DictionaryValue** out_value) {
 589   return static_cast<const DictionaryValue&>(*this).GetDictionary(
 590       path,
 591       const_cast<const DictionaryValue**>(out_value));
 592 }
 593
 594 bool DictionaryValue::GetList(const std::string& path,
 595                               const ListValue** out_value) const {
 596   const Value* value;
 597   bool result = Get(path, &value);
 598   if (!result || !value->IsType(TYPE_LIST))
 599     return false;
 600
 601   if (out_value)
 602     *out_value = static_cast<const ListValue*>(value);
 603
 604   return true;
 605 }
 606
 607 bool DictionaryValue::GetList(const std::string& path, ListValue** out_value) {
 608   return static_cast<const DictionaryValue&>(*this).GetList(
 609       path,
 610       const_cast<const ListValue**>(out_value));
 611 }
 612
 613 bool DictionaryValue::GetWithoutPathExpansion(const std::string& key,
 614                                               const Value** out_value) const {
 615   DCHECK(IsStringUTF8(key));
 616   ValueMap::const_iterator entry_iterator = dictionary_.find(key);
 617   if (entry_iterator == dictionary_.end())
 618     return false;
 619
 620   const Value* entry = entry_iterator->second;
 621   if (out_value)
 622     *out_value = entry;
 623   return true;
 624 }
 625
 626 bool DictionaryValue::GetWithoutPathExpansion(const std::string& key,
 627                                               Value** out_value) {
 628   return static_cast<const DictionaryValue&>(*this).GetWithoutPathExpansion(
 629       key,
 630       const_cast<const Value**>(out_value));
 631 }
 632
 633 bool DictionaryValue::GetBooleanWithoutPathExpansion(const std::string& key,
 634                                                      bool* out_value) const {
 635   const Value* value;
 636   if (!GetWithoutPathExpansion(key, &value))
 637     return false;
 638
 639   return value->GetAsBoolean(out_value);
 640 }
 641
 642 bool DictionaryValue::GetIntegerWithoutPathExpansion(const std::string& key,
 643                                                      int* out_value) const {
 644   const Value* value;
 645   if (!GetWithoutPathExpansion(key, &value))
 646     return false;
 647
 648   return value->GetAsInteger(out_value);
 649 }
 650
 651 bool DictionaryValue::GetDoubleWithoutPathExpansion(const std::string& key,
 652                                                     double* out_value) const {
 653   const Value* value;
 654   if (!GetWithoutPathExpansion(key, &value))
 655     return false;
 656
 657   return value->GetAsDouble(out_value);
 658 }
 659
 660 bool DictionaryValue::GetStringWithoutPathExpansion(
 661     const std::string& key,
 662     std::string* out_value) const {
 663   const Value* value;
 664   if (!GetWithoutPathExpansion(key, &value))
 665     return false;
 666
 667   return value->GetAsString(out_value);
 668 }
 669
 670 bool DictionaryValue::GetStringWithoutPathExpansion(const std::string& key,
 671                                                     string16* out_value) const {
 672   const Value* value;
 673   if (!GetWithoutPathExpansion(key, &value))
 674     return false;
 675
 676   return value->GetAsString(out_value);
 677 }
 678
 679 bool DictionaryValue::GetDictionaryWithoutPathExpansion(
 680     const std::string& key,
 681     const DictionaryValue** out_value) const {
 682   const Value* value;
 683   bool result = GetWithoutPathExpansion(key, &value);
 684   if (!result || !value->IsType(TYPE_DICTIONARY))
 685     return false;
 686
 687   if (out_value)
 688     *out_value = static_cast<const DictionaryValue*>(value);
 689
 690   return true;
 691 }
 692
 693 bool DictionaryValue::GetDictionaryWithoutPathExpansion(
 694     const std::string& key,
 695     DictionaryValue** out_value) {
 696   const DictionaryValue& const_this =
 697       static_cast<const DictionaryValue&>(*this);
 698   return const_this.GetDictionaryWithoutPathExpansion(
 699           key,
 700           const_cast<const DictionaryValue**>(out_value));
 701 }
 702
 703 bool DictionaryValue::GetListWithoutPathExpansion(
 704     const std::string& key,
 705     const ListValue** out_value) const {
 706   const Value* value;
 707   bool result = GetWithoutPathExpansion(key, &value);
 708   if (!result || !value->IsType(TYPE_LIST))
 709     return false;
 710
 711   if (out_value)
 712     *out_value = static_cast<const ListValue*>(value);
 713
 714   return true;
 715 }
 716
 717 bool DictionaryValue::GetListWithoutPathExpansion(const std::string& key,
 718                                                   ListValue** out_value) {
 719   return
 720       static_cast<const DictionaryValue&>(*this).GetListWithoutPathExpansion(
 721           key,
 722           const_cast<const ListValue**>(out_value));
 723 }
 724
 725 bool DictionaryValue::Remove(const std::string& path,
 726                              scoped_ptr<Value>* out_value) {
 727   DCHECK(IsStringUTF8(path));
 728   std::string current_path(path);
 729   DictionaryValue* current_dictionary = this;
 730   size_t delimiter_position = current_path.rfind('.');
 731   if (delimiter_position != std::string::npos) {
 732     if (!GetDictionary(current_path.substr(0, delimiter_position),
 733                        &current_dictionary))
 734       return false;
 735     current_path.erase(0, delimiter_position + 1);
 736   }
 737
 738   return current_dictionary->RemoveWithoutPathExpansion(current_path,
 739                                                         out_value);
 740 }
 741
 742 bool DictionaryValue::RemoveWithoutPathExpansion(const std::string& key,
 743                                                  scoped_ptr<Value>* out_value) {
 744   DCHECK(IsStringUTF8(key));
 745   ValueMap::iterator entry_iterator = dictionary_.find(key);
 746   if (entry_iterator == dictionary_.end())
 747     return false;
 748
 749   Value* entry = entry_iterator->second;
 750   if (out_value)
 751     out_value->reset(entry);
 752   else
 753     delete entry;
 754   dictionary_.erase(entry_iterator);
 755   return true;
 756 }
 757
 758 DictionaryValue* DictionaryValue::DeepCopyWithoutEmptyChildren() const {
 759   Value* copy = CopyWithoutEmptyChildren(this);
 760   return copy ? static_cast<DictionaryValue*>(copy) : new DictionaryValue;
 761 }
 762
 763 void DictionaryValue::MergeDictionary(const DictionaryValue* dictionary) {
 764   for (DictionaryValue::Iterator it(*dictionary); !it.IsAtEnd(); it.Advance()) {
 765     const Value* merge_value = &it.value();
 766     // Check whether we have to merge dictionaries.
 767     if (merge_value->IsType(Value::TYPE_DICTIONARY)) {
 768       DictionaryValue* sub_dict;
 769       if (GetDictionaryWithoutPathExpansion(it.key(), &sub_dict)) {
 770         sub_dict->MergeDictionary(
 771             static_cast<const DictionaryValue*>(merge_value));
 772         continue;
 773       }
 774     }
 775     // All other cases: Make a copy and hook it up.
 776     SetWithoutPathExpansion(it.key(), merge_value->DeepCopy());
 777   }
 778 }
 779
 780 void DictionaryValue::Swap(DictionaryValue* other) {
 781   dictionary_.swap(other->dictionary_);
 782 }
 783
 784 DictionaryValue::Iterator::Iterator(const DictionaryValue& target)
 785     : target_(target),
 786       it_(target.dictionary_.begin()) {}
 787
 788 DictionaryValue* DictionaryValue::DeepCopy() const {
 789   DictionaryValue* result = new DictionaryValue;
 790
 791   for (ValueMap::const_iterator current_entry(dictionary_.begin());
 792        current_entry != dictionary_.end(); ++current_entry) {
 793     result->SetWithoutPathExpansion(current_entry->first,
 794                                     current_entry->second->DeepCopy());
 795   }
 796
 797   return result;
 798 }
 799
 800 bool DictionaryValue::Equals(const Value* other) const {
 801   if (other->GetType() != GetType())
 802     return false;
 803
 804   const DictionaryValue* other_dict =
 805       static_cast<const DictionaryValue*>(other);
 806   Iterator lhs_it(*this);
 807   Iterator rhs_it(*other_dict);
 808   while (!lhs_it.IsAtEnd() && !rhs_it.IsAtEnd()) {
 809     if (lhs_it.key() != rhs_it.key() ||
 810         !lhs_it.value().Equals(&rhs_it.value())) {
 811       return false;
 812     }
 813     lhs_it.Advance();
 814     rhs_it.Advance();
 815   }
 816   if (!lhs_it.IsAtEnd() || !rhs_it.IsAtEnd())
 817     return false;
 818
 819   return true;
 820 }
 821
 822 ///////////////////// ListValue ////////////////////
 823
 824 ListValue::ListValue() : Value(TYPE_LIST) {
 825 }
 826
 827 ListValue::~ListValue() {
 828   Clear();
 829 }
 830
 831 void ListValue::Clear() {
 832   for (ValueVector::iterator i(list_.begin()); i != list_.end(); ++i)
 833     delete *i;
 834   list_.clear();
 835 }
 836
 837 bool ListValue::Set(size_t index, Value* in_value) {
 838   if (!in_value)
 839     return false;
 840
 841   if (index >= list_.size()) {
 842     // Pad out any intermediate indexes with null settings
 843     while (index > list_.size())
 844       Append(CreateNullValue());
 845     Append(in_value);
 846   } else {
 847     DCHECK(list_[index] != in_value);
 848     delete list_[index];
 849     list_[index] = in_value;
 850   }
 851   return true;
 852 }
 853
 854 bool ListValue::Get(size_t index, const Value** out_value) const {
 855   if (index >= list_.size())
 856     return false;
 857
 858   if (out_value)
 859     *out_value = list_[index];
 860
 861   return true;
 862 }
 863
 864 bool ListValue::Get(size_t index, Value** out_value) {
 865   return static_cast<const ListValue&>(*this).Get(
 866       index,
 867       const_cast<const Value**>(out_value));
 868 }
 869
 870 bool ListValue::GetBoolean(size_t index, bool* bool_value) const {
 871   const Value* value;
 872   if (!Get(index, &value))
 873     return false;
 874
 875   return value->GetAsBoolean(bool_value);
 876 }
 877
 878 bool ListValue::GetInteger(size_t index, int* out_value) const {
 879   const Value* value;
 880   if (!Get(index, &value))
 881     return false;
 882
 883   return value->GetAsInteger(out_value);
 884 }
 885
 886 bool ListValue::GetDouble(size_t index, double* out_value) const {
 887   const Value* value;
 888   if (!Get(index, &value))
 889     return false;
 890
 891   return value->GetAsDouble(out_value);
 892 }
 893
 894 bool ListValue::GetString(size_t index, std::string* out_value) const {
 895   const Value* value;
 896   if (!Get(index, &value))
 897     return false;
 898
 899   return value->GetAsString(out_value);
 900 }
 901
 902 bool ListValue::GetString(size_t index, string16* out_value) const {
 903   const Value* value;
 904   if (!Get(index, &value))
 905     return false;
 906
 907   return value->GetAsString(out_value);
 908 }
 909
 910 bool ListValue::GetBinary(size_t index, const BinaryValue** out_value) const {
 911   const Value* value;
 912   bool result = Get(index, &value);
 913   if (!result || !value->IsType(TYPE_BINARY))
 914     return false;
 915
 916   if (out_value)
 917     *out_value = static_cast<const BinaryValue*>(value);
 918
 919   return true;
 920 }
 921
 922 bool ListValue::GetBinary(size_t index, BinaryValue** out_value) {
 923   return static_cast<const ListValue&>(*this).GetBinary(
 924       index,
 925       const_cast<const BinaryValue**>(out_value));
 926 }
 927
 928 bool ListValue::GetDictionary(size_t index,
 929                               const DictionaryValue** out_value) const {
 930   const Value* value;
 931   bool result = Get(index, &value);
 932   if (!result || !value->IsType(TYPE_DICTIONARY))
 933     return false;
 934
 935   if (out_value)
 936     *out_value = static_cast<const DictionaryValue*>(value);
 937
 938   return true;
 939 }
 940
 941 bool ListValue::GetDictionary(size_t index, DictionaryValue** out_value) {
 942   return static_cast<const ListValue&>(*this).GetDictionary(
 943       index,
 944       const_cast<const DictionaryValue**>(out_value));
 945 }
 946
 947 bool ListValue::GetList(size_t index, const ListValue** out_value) const {
 948   const Value* value;
 949   bool result = Get(index, &value);
 950   if (!result || !value->IsType(TYPE_LIST))
 951     return false;
 952
 953   if (out_value)
 954     *out_value = static_cast<const ListValue*>(value);
 955
 956   return true;
 957 }
 958
 959 bool ListValue::GetList(size_t index, ListValue** out_value) {
 960   return static_cast<const ListValue&>(*this).GetList(
 961       index,
 962       const_cast<const ListValue**>(out_value));
 963 }
 964
 965 bool ListValue::Remove(size_t index, scoped_ptr<Value>* out_value) {
 966   if (index >= list_.size())
 967     return false;
 968
 969   if (out_value)
 970     out_value->reset(list_[index]);
 971   else
 972     delete list_[index];
 973
 974   list_.erase(list_.begin() + index);
 975   return true;
 976 }
 977
 978 bool ListValue::Remove(const Value& value, size_t* index) {
 979   for (ValueVector::iterator i(list_.begin()); i != list_.end(); ++i) {
 980     if ((*i)->Equals(&value)) {
 981       size_t previous_index = i - list_.begin();
 982       delete *i;
 983       list_.erase(i);
 984
 985       if (index)
 986         *index = previous_index;
 987       return true;
 988     }
 989   }
 990   return false;
 991 }
 992
 993 ListValue::iterator ListValue::Erase(iterator iter,
 994                                      scoped_ptr<Value>* out_value) {
 995   if (out_value)
 996     out_value->reset(*iter);
 997   else
 998     delete *iter;
 999
1000   return list_.erase(iter);
1001 }
1002
1003 void ListValue::Append(Value* in_value) {
1004   DCHECK(in_value);
1005   list_.push_back(in_value);
1006 }
1007
1008 void ListValue::AppendBoolean(bool in_value) {
1009   Append(CreateBooleanValue(in_value));
1010 }
1011
1012 void ListValue::AppendInteger(int in_value) {
1013   Append(CreateIntegerValue(in_value));
1014 }
1015
1016 void ListValue::AppendDouble(double in_value) {
1017   Append(CreateDoubleValue(in_value));
1018 }
1019
1020 void ListValue::AppendString(const std::string& in_value) {
1021   Append(CreateStringValue(in_value));
1022 }
1023
1024 void ListValue::AppendString(const string16& in_value) {
1025   Append(CreateStringValue(in_value));
1026 }
1027
1028 void ListValue::AppendStrings(const std::vector<std::string>& in_values) {
1029   for (std::vector<std::string>::const_iterator it = in_values.begin();
1030        it != in_values.end(); ++it) {
1031     AppendString(*it);
1032   }
1033 }
1034
1035 void ListValue::AppendStrings(const std::vector<string16>& in_values) {
1036   for (std::vector<string16>::const_iterator it = in_values.begin();
1037        it != in_values.end(); ++it) {
1038     AppendString(*it);
1039   }
1040 }
1041
1042 bool ListValue::AppendIfNotPresent(Value* in_value) {
1043   DCHECK(in_value);
1044   for (ValueVector::const_iterator i(list_.begin()); i != list_.end(); ++i) {
1045     if ((*i)->Equals(in_value)) {
1046       delete in_value;
1047       return false;
1048     }
1049   }
1050   list_.push_back(in_value);
1051   return true;
1052 }
1053
1054 bool ListValue::Insert(size_t index, Value* in_value) {
1055   DCHECK(in_value);
1056   if (index > list_.size())
1057     return false;
1058
1059   list_.insert(list_.begin() + index, in_value);
1060   return true;
1061 }
1062
1063 ListValue::const_iterator ListValue::Find(const Value& value) const {
1064   return std::find_if(list_.begin(), list_.end(), ValueEquals(&value));
1065 }
1066
1067 void ListValue::Swap(ListValue* other) {
1068   list_.swap(other->list_);
1069 }
1070
1071 bool ListValue::GetAsList(ListValue** out_value) {
1072   if (out_value)
1073     *out_value = this;
1074   return true;
1075 }
1076
1077 bool ListValue::GetAsList(const ListValue** out_value) const {
1078   if (out_value)
1079     *out_value = this;
1080   return true;
1081 }
1082
1083 ListValue* ListValue::DeepCopy() const {
1084   ListValue* result = new ListValue;
1085
1086   for (ValueVector::const_iterator i(list_.begin()); i != list_.end(); ++i)
1087     result->Append((*i)->DeepCopy());
1088
1089   return result;
1090 }
1091
1092 bool ListValue::Equals(const Value* other) const {
1093   if (other->GetType() != GetType())
1094     return false;
1095
1096   const ListValue* other_list =
1097       static_cast<const ListValue*>(other);
1098   const_iterator lhs_it, rhs_it;
1099   for (lhs_it = begin(), rhs_it = other_list->begin();
1100        lhs_it != end() && rhs_it != other_list->end();
1101        ++lhs_it, ++rhs_it) {
1102     if (!(*lhs_it)->Equals(*rhs_it))
1103       return false;
1104   }
1105   if (lhs_it != end() || rhs_it != other_list->end())
1106     return false;
1107
1108   return true;
1109 }
1110
1111 ValueSerializer::~ValueSerializer() {
1112 }
1113
1114 std::ostream& operator<<(std::ostream& out, const Value& value) {
1115   std::string json;
1116   JSONWriter::WriteWithOptions(&value,
1117                                JSONWriter::OPTIONS_PRETTY_PRINT,
1118                                &json);
1119   return out << json;
1120 }
1121
1122 }  // namespace base