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 new FundamentalValue(boolean_value_);
 229
 230     case TYPE_INTEGER:
 231       return new FundamentalValue(integer_value_);
 232
 233     case TYPE_DOUBLE:
 234       return new FundamentalValue(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 new StringValue(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, new FundamentalValue(in_value));
 407 }
 408
 409 void DictionaryValue::SetInteger(const std::string& path, int in_value) {
 410   Set(path, new FundamentalValue(in_value));
 411 }
 412
 413 void DictionaryValue::SetDouble(const std::string& path, double in_value) {
 414   Set(path, new FundamentalValue(in_value));
 415 }
 416
 417 void DictionaryValue::SetString(const std::string& path,
 418                                 const std::string& in_value) {
 419   Set(path, new StringValue(in_value));
 420 }
 421
 422 void DictionaryValue::SetString(const std::string& path,
 423                                 const string16& in_value) {
 424   Set(path, new StringValue(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, new FundamentalValue(in_value));
 443 }
 444
 445 void DictionaryValue::SetIntegerWithoutPathExpansion(
 446     const std::string& path, int in_value) {
 447   SetWithoutPathExpansion(path, new FundamentalValue(in_value));
 448 }
 449
 450 void DictionaryValue::SetDoubleWithoutPathExpansion(
 451     const std::string& path, double in_value) {
 452   SetWithoutPathExpansion(path, new FundamentalValue(in_value));
 453 }
 454
 455 void DictionaryValue::SetStringWithoutPathExpansion(
 456     const std::string& path, const std::string& in_value) {
 457   SetWithoutPathExpansion(path, new StringValue(in_value));
 458 }
 459
 460 void DictionaryValue::SetStringWithoutPathExpansion(
 461     const std::string& path, const string16& in_value) {
 462   SetWithoutPathExpansion(path, new StringValue(in_value));
 463 }
 464
 465 bool DictionaryValue::Get(const std::string& path,
 466                           const Value** out_value) const {
 467   DCHECK(IsStringUTF8(path));
 468   std::string current_path(path);
 469   const DictionaryValue* current_dictionary = this;
 470   for (size_t delimiter_position = current_path.find('.');
 471        delimiter_position != std::string::npos;
 472        delimiter_position = current_path.find('.')) {
 473     const DictionaryValue* child_dictionary = NULL;
 474     if (!current_dictionary->GetDictionary(
 475             current_path.substr(0, delimiter_position), &child_dictionary))
 476       return false;
 477
 478     current_dictionary = child_dictionary;
 479     current_path.erase(0, delimiter_position + 1);
 480   }
 481
 482   return current_dictionary->GetWithoutPathExpansion(current_path, out_value);
 483 }
 484
 485 bool DictionaryValue::Get(const std::string& path, Value** out_value)  {
 486   return static_cast<const DictionaryValue&>(*this).Get(
 487       path,
 488       const_cast<const Value**>(out_value));
 489 }
 490
 491 bool DictionaryValue::GetBoolean(const std::string& path,
 492                                  bool* bool_value) const {
 493   const Value* value;
 494   if (!Get(path, &value))
 495     return false;
 496
 497   return value->GetAsBoolean(bool_value);
 498 }
 499
 500 bool DictionaryValue::GetInteger(const std::string& path,
 501                                  int* out_value) const {
 502   const Value* value;
 503   if (!Get(path, &value))
 504     return false;
 505
 506   return value->GetAsInteger(out_value);
 507 }
 508
 509 bool DictionaryValue::GetDouble(const std::string& path,
 510                                 double* out_value) const {
 511   const Value* value;
 512   if (!Get(path, &value))
 513     return false;
 514
 515   return value->GetAsDouble(out_value);
 516 }
 517
 518 bool DictionaryValue::GetString(const std::string& path,
 519                                 std::string* out_value) const {
 520   const Value* value;
 521   if (!Get(path, &value))
 522     return false;
 523
 524   return value->GetAsString(out_value);
 525 }
 526
 527 bool DictionaryValue::GetString(const std::string& path,
 528                                 string16* out_value) const {
 529   const Value* value;
 530   if (!Get(path, &value))
 531     return false;
 532
 533   return value->GetAsString(out_value);
 534 }
 535
 536 bool DictionaryValue::GetStringASCII(const std::string& path,
 537                                      std::string* out_value) const {
 538   std::string out;
 539   if (!GetString(path, &out))
 540     return false;
 541
 542   if (!IsStringASCII(out)) {
 543     NOTREACHED();
 544     return false;
 545   }
 546
 547   out_value->assign(out);
 548   return true;
 549 }
 550
 551 bool DictionaryValue::GetBinary(const std::string& path,
 552                                 const BinaryValue** out_value) const {
 553   const Value* value;
 554   bool result = Get(path, &value);
 555   if (!result || !value->IsType(TYPE_BINARY))
 556     return false;
 557
 558   if (out_value)
 559     *out_value = static_cast<const BinaryValue*>(value);
 560
 561   return true;
 562 }
 563
 564 bool DictionaryValue::GetBinary(const std::string& path,
 565                                 BinaryValue** out_value) {
 566   return static_cast<const DictionaryValue&>(*this).GetBinary(
 567       path,
 568       const_cast<const BinaryValue**>(out_value));
 569 }
 570
 571 bool DictionaryValue::GetDictionary(const std::string& path,
 572                                     const DictionaryValue** out_value) const {
 573   const Value* value;
 574   bool result = Get(path, &value);
 575   if (!result || !value->IsType(TYPE_DICTIONARY))
 576     return false;
 577
 578   if (out_value)
 579     *out_value = static_cast<const DictionaryValue*>(value);
 580
 581   return true;
 582 }
 583
 584 bool DictionaryValue::GetDictionary(const std::string& path,
 585                                     DictionaryValue** out_value) {
 586   return static_cast<const DictionaryValue&>(*this).GetDictionary(
 587       path,
 588       const_cast<const DictionaryValue**>(out_value));
 589 }
 590
 591 bool DictionaryValue::GetList(const std::string& path,
 592                               const ListValue** out_value) const {
 593   const Value* value;
 594   bool result = Get(path, &value);
 595   if (!result || !value->IsType(TYPE_LIST))
 596     return false;
 597
 598   if (out_value)
 599     *out_value = static_cast<const ListValue*>(value);
 600
 601   return true;
 602 }
 603
 604 bool DictionaryValue::GetList(const std::string& path, ListValue** out_value) {
 605   return static_cast<const DictionaryValue&>(*this).GetList(
 606       path,
 607       const_cast<const ListValue**>(out_value));
 608 }
 609
 610 bool DictionaryValue::GetWithoutPathExpansion(const std::string& key,
 611                                               const Value** out_value) const {
 612   DCHECK(IsStringUTF8(key));
 613   ValueMap::const_iterator entry_iterator = dictionary_.find(key);
 614   if (entry_iterator == dictionary_.end())
 615     return false;
 616
 617   const Value* entry = entry_iterator->second;
 618   if (out_value)
 619     *out_value = entry;
 620   return true;
 621 }
 622
 623 bool DictionaryValue::GetWithoutPathExpansion(const std::string& key,
 624                                               Value** out_value) {
 625   return static_cast<const DictionaryValue&>(*this).GetWithoutPathExpansion(
 626       key,
 627       const_cast<const Value**>(out_value));
 628 }
 629
 630 bool DictionaryValue::GetBooleanWithoutPathExpansion(const std::string& key,
 631                                                      bool* out_value) const {
 632   const Value* value;
 633   if (!GetWithoutPathExpansion(key, &value))
 634     return false;
 635
 636   return value->GetAsBoolean(out_value);
 637 }
 638
 639 bool DictionaryValue::GetIntegerWithoutPathExpansion(const std::string& key,
 640                                                      int* out_value) const {
 641   const Value* value;
 642   if (!GetWithoutPathExpansion(key, &value))
 643     return false;
 644
 645   return value->GetAsInteger(out_value);
 646 }
 647
 648 bool DictionaryValue::GetDoubleWithoutPathExpansion(const std::string& key,
 649                                                     double* out_value) const {
 650   const Value* value;
 651   if (!GetWithoutPathExpansion(key, &value))
 652     return false;
 653
 654   return value->GetAsDouble(out_value);
 655 }
 656
 657 bool DictionaryValue::GetStringWithoutPathExpansion(
 658     const std::string& key,
 659     std::string* out_value) const {
 660   const Value* value;
 661   if (!GetWithoutPathExpansion(key, &value))
 662     return false;
 663
 664   return value->GetAsString(out_value);
 665 }
 666
 667 bool DictionaryValue::GetStringWithoutPathExpansion(const std::string& key,
 668                                                     string16* out_value) const {
 669   const Value* value;
 670   if (!GetWithoutPathExpansion(key, &value))
 671     return false;
 672
 673   return value->GetAsString(out_value);
 674 }
 675
 676 bool DictionaryValue::GetDictionaryWithoutPathExpansion(
 677     const std::string& key,
 678     const DictionaryValue** out_value) const {
 679   const Value* value;
 680   bool result = GetWithoutPathExpansion(key, &value);
 681   if (!result || !value->IsType(TYPE_DICTIONARY))
 682     return false;
 683
 684   if (out_value)
 685     *out_value = static_cast<const DictionaryValue*>(value);
 686
 687   return true;
 688 }
 689
 690 bool DictionaryValue::GetDictionaryWithoutPathExpansion(
 691     const std::string& key,
 692     DictionaryValue** out_value) {
 693   const DictionaryValue& const_this =
 694       static_cast<const DictionaryValue&>(*this);
 695   return const_this.GetDictionaryWithoutPathExpansion(
 696           key,
 697           const_cast<const DictionaryValue**>(out_value));
 698 }
 699
 700 bool DictionaryValue::GetListWithoutPathExpansion(
 701     const std::string& key,
 702     const ListValue** out_value) const {
 703   const Value* value;
 704   bool result = GetWithoutPathExpansion(key, &value);
 705   if (!result || !value->IsType(TYPE_LIST))
 706     return false;
 707
 708   if (out_value)
 709     *out_value = static_cast<const ListValue*>(value);
 710
 711   return true;
 712 }
 713
 714 bool DictionaryValue::GetListWithoutPathExpansion(const std::string& key,
 715                                                   ListValue** out_value) {
 716   return
 717       static_cast<const DictionaryValue&>(*this).GetListWithoutPathExpansion(
 718           key,
 719           const_cast<const ListValue**>(out_value));
 720 }
 721
 722 bool DictionaryValue::Remove(const std::string& path,
 723                              scoped_ptr<Value>* out_value) {
 724   DCHECK(IsStringUTF8(path));
 725   std::string current_path(path);
 726   DictionaryValue* current_dictionary = this;
 727   size_t delimiter_position = current_path.rfind('.');
 728   if (delimiter_position != std::string::npos) {
 729     if (!GetDictionary(current_path.substr(0, delimiter_position),
 730                        &current_dictionary))
 731       return false;
 732     current_path.erase(0, delimiter_position + 1);
 733   }
 734
 735   return current_dictionary->RemoveWithoutPathExpansion(current_path,
 736                                                         out_value);
 737 }
 738
 739 bool DictionaryValue::RemoveWithoutPathExpansion(const std::string& key,
 740                                                  scoped_ptr<Value>* out_value) {
 741   DCHECK(IsStringUTF8(key));
 742   ValueMap::iterator entry_iterator = dictionary_.find(key);
 743   if (entry_iterator == dictionary_.end())
 744     return false;
 745
 746   Value* entry = entry_iterator->second;
 747   if (out_value)
 748     out_value->reset(entry);
 749   else
 750     delete entry;
 751   dictionary_.erase(entry_iterator);
 752   return true;
 753 }
 754
 755 bool DictionaryValue::RemovePath(const std::string& path,
 756                                  scoped_ptr<Value>* out_value) {
 757   bool result = false;
 758   size_t delimiter_position = path.find('.');
 759
 760   if (delimiter_position == std::string::npos)
 761     return RemoveWithoutPathExpansion(path, out_value);
 762
 763   const std::string subdict_path = path.substr(0, delimiter_position);
 764   DictionaryValue* subdict = NULL;
 765   if (!GetDictionary(subdict_path, &subdict))
 766     return false;
 767   result = subdict->RemovePath(path.substr(delimiter_position + 1),
 768                                out_value);
 769   if (result && subdict->empty())
 770     RemoveWithoutPathExpansion(subdict_path, NULL);
 771
 772   return result;
 773 }
 774
 775 DictionaryValue* DictionaryValue::DeepCopyWithoutEmptyChildren() const {
 776   Value* copy = CopyWithoutEmptyChildren(this);
 777   return copy ? static_cast<DictionaryValue*>(copy) : new DictionaryValue;
 778 }
 779
 780 void DictionaryValue::MergeDictionary(const DictionaryValue* dictionary) {
 781   for (DictionaryValue::Iterator it(*dictionary); !it.IsAtEnd(); it.Advance()) {
 782     const Value* merge_value = &it.value();
 783     // Check whether we have to merge dictionaries.
 784     if (merge_value->IsType(Value::TYPE_DICTIONARY)) {
 785       DictionaryValue* sub_dict;
 786       if (GetDictionaryWithoutPathExpansion(it.key(), &sub_dict)) {
 787         sub_dict->MergeDictionary(
 788             static_cast<const DictionaryValue*>(merge_value));
 789         continue;
 790       }
 791     }
 792     // All other cases: Make a copy and hook it up.
 793     SetWithoutPathExpansion(it.key(), merge_value->DeepCopy());
 794   }
 795 }
 796
 797 void DictionaryValue::Swap(DictionaryValue* other) {
 798   dictionary_.swap(other->dictionary_);
 799 }
 800
 801 DictionaryValue::Iterator::Iterator(const DictionaryValue& target)
 802     : target_(target),
 803       it_(target.dictionary_.begin()) {}
 804
 805 DictionaryValue::Iterator::~Iterator() {}
 806
 807 DictionaryValue* DictionaryValue::DeepCopy() const {
 808   DictionaryValue* result = new DictionaryValue;
 809
 810   for (ValueMap::const_iterator current_entry(dictionary_.begin());
 811        current_entry != dictionary_.end(); ++current_entry) {
 812     result->SetWithoutPathExpansion(current_entry->first,
 813                                     current_entry->second->DeepCopy());
 814   }
 815
 816   return result;
 817 }
 818
 819 bool DictionaryValue::Equals(const Value* other) const {
 820   if (other->GetType() != GetType())
 821     return false;
 822
 823   const DictionaryValue* other_dict =
 824       static_cast<const DictionaryValue*>(other);
 825   Iterator lhs_it(*this);
 826   Iterator rhs_it(*other_dict);
 827   while (!lhs_it.IsAtEnd() && !rhs_it.IsAtEnd()) {
 828     if (lhs_it.key() != rhs_it.key() ||
 829         !lhs_it.value().Equals(&rhs_it.value())) {
 830       return false;
 831     }
 832     lhs_it.Advance();
 833     rhs_it.Advance();
 834   }
 835   if (!lhs_it.IsAtEnd() || !rhs_it.IsAtEnd())
 836     return false;
 837
 838   return true;
 839 }
 840
 841 ///////////////////// ListValue ////////////////////
 842
 843 ListValue::ListValue() : Value(TYPE_LIST) {
 844 }
 845
 846 ListValue::~ListValue() {
 847   Clear();
 848 }
 849
 850 void ListValue::Clear() {
 851   for (ValueVector::iterator i(list_.begin()); i != list_.end(); ++i)
 852     delete *i;
 853   list_.clear();
 854 }
 855
 856 bool ListValue::Set(size_t index, Value* in_value) {
 857   if (!in_value)
 858     return false;
 859
 860   if (index >= list_.size()) {
 861     // Pad out any intermediate indexes with null settings
 862     while (index > list_.size())
 863       Append(CreateNullValue());
 864     Append(in_value);
 865   } else {
 866     DCHECK(list_[index] != in_value);
 867     delete list_[index];
 868     list_[index] = in_value;
 869   }
 870   return true;
 871 }
 872
 873 bool ListValue::Get(size_t index, const Value** out_value) const {
 874   if (index >= list_.size())
 875     return false;
 876
 877   if (out_value)
 878     *out_value = list_[index];
 879
 880   return true;
 881 }
 882
 883 bool ListValue::Get(size_t index, Value** out_value) {
 884   return static_cast<const ListValue&>(*this).Get(
 885       index,
 886       const_cast<const Value**>(out_value));
 887 }
 888
 889 bool ListValue::GetBoolean(size_t index, bool* bool_value) const {
 890   const Value* value;
 891   if (!Get(index, &value))
 892     return false;
 893
 894   return value->GetAsBoolean(bool_value);
 895 }
 896
 897 bool ListValue::GetInteger(size_t index, int* out_value) const {
 898   const Value* value;
 899   if (!Get(index, &value))
 900     return false;
 901
 902   return value->GetAsInteger(out_value);
 903 }
 904
 905 bool ListValue::GetDouble(size_t index, double* out_value) const {
 906   const Value* value;
 907   if (!Get(index, &value))
 908     return false;
 909
 910   return value->GetAsDouble(out_value);
 911 }
 912
 913 bool ListValue::GetString(size_t index, std::string* out_value) const {
 914   const Value* value;
 915   if (!Get(index, &value))
 916     return false;
 917
 918   return value->GetAsString(out_value);
 919 }
 920
 921 bool ListValue::GetString(size_t index, string16* out_value) const {
 922   const Value* value;
 923   if (!Get(index, &value))
 924     return false;
 925
 926   return value->GetAsString(out_value);
 927 }
 928
 929 bool ListValue::GetBinary(size_t index, const BinaryValue** out_value) const {
 930   const Value* value;
 931   bool result = Get(index, &value);
 932   if (!result || !value->IsType(TYPE_BINARY))
 933     return false;
 934
 935   if (out_value)
 936     *out_value = static_cast<const BinaryValue*>(value);
 937
 938   return true;
 939 }
 940
 941 bool ListValue::GetBinary(size_t index, BinaryValue** out_value) {
 942   return static_cast<const ListValue&>(*this).GetBinary(
 943       index,
 944       const_cast<const BinaryValue**>(out_value));
 945 }
 946
 947 bool ListValue::GetDictionary(size_t index,
 948                               const DictionaryValue** out_value) const {
 949   const Value* value;
 950   bool result = Get(index, &value);
 951   if (!result || !value->IsType(TYPE_DICTIONARY))
 952     return false;
 953
 954   if (out_value)
 955     *out_value = static_cast<const DictionaryValue*>(value);
 956
 957   return true;
 958 }
 959
 960 bool ListValue::GetDictionary(size_t index, DictionaryValue** out_value) {
 961   return static_cast<const ListValue&>(*this).GetDictionary(
 962       index,
 963       const_cast<const DictionaryValue**>(out_value));
 964 }
 965
 966 bool ListValue::GetList(size_t index, const ListValue** out_value) const {
 967   const Value* value;
 968   bool result = Get(index, &value);
 969   if (!result || !value->IsType(TYPE_LIST))
 970     return false;
 971
 972   if (out_value)
 973     *out_value = static_cast<const ListValue*>(value);
 974
 975   return true;
 976 }
 977
 978 bool ListValue::GetList(size_t index, ListValue** out_value) {
 979   return static_cast<const ListValue&>(*this).GetList(
 980       index,
 981       const_cast<const ListValue**>(out_value));
 982 }
 983
 984 bool ListValue::Remove(size_t index, scoped_ptr<Value>* out_value) {
 985   if (index >= list_.size())
 986     return false;
 987
 988   if (out_value)
 989     out_value->reset(list_[index]);
 990   else
 991     delete list_[index];
 992
 993   list_.erase(list_.begin() + index);
 994   return true;
 995 }
 996
 997 bool ListValue::Remove(const Value& value, size_t* index) {
 998   for (ValueVector::iterator i(list_.begin()); i != list_.end(); ++i) {
 999     if ((*i)->Equals(&value)) {
1000       size_t previous_index = i - list_.begin();
1001       delete *i;
1002       list_.erase(i);
1003
1004       if (index)
1005         *index = previous_index;
1006       return true;
1007     }
1008   }
1009   return false;
1010 }
1011
1012 ListValue::iterator ListValue::Erase(iterator iter,
1013                                      scoped_ptr<Value>* out_value) {
1014   if (out_value)
1015     out_value->reset(*iter);
1016   else
1017     delete *iter;
1018
1019   return list_.erase(iter);
1020 }
1021
1022 void ListValue::Append(Value* in_value) {
1023   DCHECK(in_value);
1024   list_.push_back(in_value);
1025 }
1026
1027 void ListValue::AppendBoolean(bool in_value) {
1028   Append(new FundamentalValue(in_value));
1029 }
1030
1031 void ListValue::AppendInteger(int in_value) {
1032   Append(new FundamentalValue(in_value));
1033 }
1034
1035 void ListValue::AppendDouble(double in_value) {
1036   Append(new FundamentalValue(in_value));
1037 }
1038
1039 void ListValue::AppendString(const std::string& in_value) {
1040   Append(new StringValue(in_value));
1041 }
1042
1043 void ListValue::AppendString(const string16& in_value) {
1044   Append(new StringValue(in_value));
1045 }
1046
1047 void ListValue::AppendStrings(const std::vector<std::string>& in_values) {
1048   for (std::vector<std::string>::const_iterator it = in_values.begin();
1049        it != in_values.end(); ++it) {
1050     AppendString(*it);
1051   }
1052 }
1053
1054 void ListValue::AppendStrings(const std::vector<string16>& in_values) {
1055   for (std::vector<string16>::const_iterator it = in_values.begin();
1056        it != in_values.end(); ++it) {
1057     AppendString(*it);
1058   }
1059 }
1060
1061 bool ListValue::AppendIfNotPresent(Value* in_value) {
1062   DCHECK(in_value);
1063   for (ValueVector::const_iterator i(list_.begin()); i != list_.end(); ++i) {
1064     if ((*i)->Equals(in_value)) {
1065       delete in_value;
1066       return false;
1067     }
1068   }
1069   list_.push_back(in_value);
1070   return true;
1071 }
1072
1073 bool ListValue::Insert(size_t index, Value* in_value) {
1074   DCHECK(in_value);
1075   if (index > list_.size())
1076     return false;
1077
1078   list_.insert(list_.begin() + index, in_value);
1079   return true;
1080 }
1081
1082 ListValue::const_iterator ListValue::Find(const Value& value) const {
1083   return std::find_if(list_.begin(), list_.end(), ValueEquals(&value));
1084 }
1085
1086 void ListValue::Swap(ListValue* other) {
1087   list_.swap(other->list_);
1088 }
1089
1090 bool ListValue::GetAsList(ListValue** out_value) {
1091   if (out_value)
1092     *out_value = this;
1093   return true;
1094 }
1095
1096 bool ListValue::GetAsList(const ListValue** out_value) const {
1097   if (out_value)
1098     *out_value = this;
1099   return true;
1100 }
1101
1102 ListValue* ListValue::DeepCopy() const {
1103   ListValue* result = new ListValue;
1104
1105   for (ValueVector::const_iterator i(list_.begin()); i != list_.end(); ++i)
1106     result->Append((*i)->DeepCopy());
1107
1108   return result;
1109 }
1110
1111 bool ListValue::Equals(const Value* other) const {
1112   if (other->GetType() != GetType())
1113     return false;
1114
1115   const ListValue* other_list =
1116       static_cast<const ListValue*>(other);
1117   const_iterator lhs_it, rhs_it;
1118   for (lhs_it = begin(), rhs_it = other_list->begin();
1119        lhs_it != end() && rhs_it != other_list->end();
1120        ++lhs_it, ++rhs_it) {
1121     if (!(*lhs_it)->Equals(*rhs_it))
1122       return false;
1123   }
1124   if (lhs_it != end() || rhs_it != other_list->end())
1125     return false;
1126
1127   return true;
1128 }
1129
1130 ValueSerializer::~ValueSerializer() {
1131 }
1132
1133 std::ostream& operator<<(std::ostream& out, const Value& value) {
1134   std::string json;
1135   JSONWriter::WriteWithOptions(&value,
1136                                JSONWriter::OPTIONS_PRETTY_PRINT,
1137                                &json);
1138   return out << json;
1139 }
1140
1141 }  // namespace base