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