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