base/values.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "base/values.h"
   6
   7 #include <string.h>
   8
   9 #include <algorithm>
  10 #include <cmath>
  11 #include <ostream>
  12
  13 #include "base/json/json_writer.h"
  14 #include "base/logging.h"
  15 #include "base/move.h"
  16 #include "base/strings/string_util.h"
  17 #include "base/strings/utf_string_conversions.h"
  18
  19 namespace base {
  20
  21 namespace {
  22
  23 scoped_ptr<Value> CopyWithoutEmptyChildren(const Value& node);
  24
  25 // Make a deep copy of |node|, but don't include empty lists or dictionaries
  26 // in the copy. It's possible for this function to return NULL and it
  27 // expects |node| to always be non-NULL.
  28 scoped_ptr<ListValue> CopyListWithoutEmptyChildren(const ListValue& list) {
  29   scoped_ptr<ListValue> copy;
  30   for (ListValue::const_iterator it = list.begin(); it != list.end(); ++it) {
  31     scoped_ptr<Value> child_copy = CopyWithoutEmptyChildren(**it);
  32     if (child_copy) {
  33       if (!copy)
  34         copy.reset(new ListValue);
  35       copy->Append(child_copy.Pass());
  36     }
  37   }
  38   return copy;
  39 }
  40
  41 scoped_ptr<DictionaryValue> CopyDictionaryWithoutEmptyChildren(
  42     const DictionaryValue& dict) {
  43   scoped_ptr<DictionaryValue> copy;
  44   for (DictionaryValue::Iterator it(dict); !it.IsAtEnd(); it.Advance()) {
  45     scoped_ptr<Value> child_copy = CopyWithoutEmptyChildren(it.value());
  46     if (child_copy) {
  47       if (!copy)
  48         copy.reset(new DictionaryValue);
  49       copy->SetWithoutPathExpansion(it.key(), child_copy.Pass());
  50     }
  51   }
  52   return copy;
  53 }
  54
  55 scoped_ptr<Value> CopyWithoutEmptyChildren(const Value& node) {
  56   switch (node.GetType()) {
  57     case Value::TYPE_LIST:
  58       return CopyListWithoutEmptyChildren(static_cast<const ListValue&>(node));
  59
  60     case Value::TYPE_DICTIONARY:
  61       return CopyDictionaryWithoutEmptyChildren(
  62           static_cast<const DictionaryValue&>(node));
  63
  64     default:
  65       return node.CreateDeepCopy();
  66   }
  67 }
  68
  69 // A small functor for comparing Values for std::find_if and similar.
  70 class ValueEquals {
  71  public:
  72   // Pass the value against which all consecutive calls of the () operator will
  73   // compare their argument to. This Value object must not be destroyed while
  74   // the ValueEquals is  in use.
  75   explicit ValueEquals(const Value* first) : first_(first) { }
  76
  77   bool operator ()(const Value* second) const {
  78     return first_->Equals(second);
  79   }
  80
  81  private:
  82   const Value* first_;
  83 };
  84
  85 }  // namespace
  86
  87 Value::~Value() {
  88 }
  89
  90 // static
  91 scoped_ptr<Value> Value::CreateNullValue() {
  92   return make_scoped_ptr(new Value(TYPE_NULL));
  93 }
  94
  95 bool Value::GetAsBinary(const BinaryValue** out_value) const {
  96   return false;
  97 }
  98
  99 bool Value::GetAsBoolean(bool* out_value) const {
 100   return false;
 101 }
 102
 103 bool Value::GetAsInteger(int* out_value) const {
 104   return false;
 105 }
 106
 107 bool Value::GetAsDouble(double* out_value) const {
 108   return false;
 109 }
 110
 111 bool Value::GetAsString(std::string* out_value) const {
 112   return false;
 113 }
 114
 115 bool Value::GetAsString(string16* out_value) const {
 116   return false;
 117 }
 118
 119 bool Value::GetAsString(const StringValue** out_value) const {
 120   return false;
 121 }
 122
 123 bool Value::GetAsList(ListValue** out_value) {
 124   return false;
 125 }
 126
 127 bool Value::GetAsList(const ListValue** out_value) const {
 128   return false;
 129 }
 130
 131 bool Value::GetAsDictionary(DictionaryValue** out_value) {
 132   return false;
 133 }
 134
 135 bool Value::GetAsDictionary(const DictionaryValue** out_value) const {
 136   return false;
 137 }
 138
 139 Value* Value::DeepCopy() const {
 140   // This method should only be getting called for null Values--all subclasses
 141   // need to provide their own implementation;.
 142   DCHECK(IsType(TYPE_NULL));
 143   return CreateNullValue().release();
 144 }
 145
 146 scoped_ptr<Value> Value::CreateDeepCopy() const {
 147   return make_scoped_ptr(DeepCopy());
 148 }
 149
 150 bool Value::Equals(const Value* other) const {
 151   // This method should only be getting called for null Values--all subclasses
 152   // need to provide their own implementation;.
 153   DCHECK(IsType(TYPE_NULL));
 154   return other->IsType(TYPE_NULL);
 155 }
 156
 157 // static
 158 bool Value::Equals(const Value* a, const Value* b) {
 159   if ((a == NULL) && (b == NULL)) return true;
 160   if ((a == NULL) ^  (b == NULL)) return false;
 161   return a->Equals(b);
 162 }
 163
 164 Value::Value(Type type) : type_(type) {}
 165
 166 Value::Value(const Value& that) : type_(that.type_) {}
 167
 168 Value& Value::operator=(const Value& that) {
 169   type_ = that.type_;
 170   return *this;
 171 }
 172
 173 ///////////////////// FundamentalValue ////////////////////
 174
 175 FundamentalValue::FundamentalValue(bool in_value)
 176     : Value(TYPE_BOOLEAN), boolean_value_(in_value) {
 177 }
 178
 179 FundamentalValue::FundamentalValue(int in_value)
 180     : Value(TYPE_INTEGER), integer_value_(in_value) {
 181 }
 182
 183 FundamentalValue::FundamentalValue(double in_value)
 184     : Value(TYPE_DOUBLE), double_value_(in_value) {
 185   if (!std::isfinite(double_value_)) {
 186     NOTREACHED() << "Non-finite (i.e. NaN or positive/negative infinity) "
 187                  << "values cannot be represented in JSON";
 188     double_value_ = 0.0;
 189   }
 190 }
 191
 192 FundamentalValue::~FundamentalValue() {
 193 }
 194
 195 bool FundamentalValue::GetAsBoolean(bool* out_value) const {
 196   if (out_value && IsType(TYPE_BOOLEAN))
 197     *out_value = boolean_value_;
 198   return (IsType(TYPE_BOOLEAN));
 199 }
 200
 201 bool FundamentalValue::GetAsInteger(int* out_value) const {
 202   if (out_value && IsType(TYPE_INTEGER))
 203     *out_value = integer_value_;
 204   return (IsType(TYPE_INTEGER));
 205 }
 206
 207 bool FundamentalValue::GetAsDouble(double* out_value) const {
 208   if (out_value && IsType(TYPE_DOUBLE))
 209     *out_value = double_value_;
 210   else if (out_value && IsType(TYPE_INTEGER))
 211     *out_value = integer_value_;
 212   return (IsType(TYPE_DOUBLE) || IsType(TYPE_INTEGER));
 213 }
 214
 215 FundamentalValue* FundamentalValue::DeepCopy() const {
 216   switch (GetType()) {
 217     case TYPE_BOOLEAN:
 218       return new FundamentalValue(boolean_value_);
 219
 220     case TYPE_INTEGER:
 221       return new FundamentalValue(integer_value_);
 222
 223     case TYPE_DOUBLE:
 224       return new FundamentalValue(double_value_);
 225
 226     default:
 227       NOTREACHED();
 228       return NULL;
 229   }
 230 }
 231
 232 bool FundamentalValue::Equals(const Value* other) const {
 233   if (other->GetType() != GetType())
 234     return false;
 235
 236   switch (GetType()) {
 237     case TYPE_BOOLEAN: {
 238       bool lhs, rhs;
 239       return GetAsBoolean(&lhs) && other->GetAsBoolean(&rhs) && lhs == rhs;
 240     }
 241     case TYPE_INTEGER: {
 242       int lhs, rhs;
 243       return GetAsInteger(&lhs) && other->GetAsInteger(&rhs) && lhs == rhs;
 244     }
 245     case TYPE_DOUBLE: {
 246       double lhs, rhs;
 247       return GetAsDouble(&lhs) && other->GetAsDouble(&rhs) && lhs == rhs;
 248     }
 249     default:
 250       NOTREACHED();
 251       return false;
 252   }
 253 }
 254
 255 ///////////////////// StringValue ////////////////////
 256
 257 StringValue::StringValue(const std::string& in_value)
 258     : Value(TYPE_STRING),
 259       value_(in_value) {
 260   DCHECK(IsStringUTF8(in_value));
 261 }
 262
 263 StringValue::StringValue(const string16& in_value)
 264     : Value(TYPE_STRING),
 265       value_(UTF16ToUTF8(in_value)) {
 266 }
 267
 268 StringValue::~StringValue() {
 269 }
 270
 271 std::string* StringValue::GetString() {
 272   return &value_;
 273 }
 274
 275 const std::string& StringValue::GetString() const {
 276   return value_;
 277 }
 278
 279 bool StringValue::GetAsString(std::string* out_value) const {
 280   if (out_value)
 281     *out_value = value_;
 282   return true;
 283 }
 284
 285 bool StringValue::GetAsString(string16* out_value) const {
 286   if (out_value)
 287     *out_value = UTF8ToUTF16(value_);
 288   return true;
 289 }
 290
 291 bool StringValue::GetAsString(const StringValue** out_value) const {
 292   if (out_value)
 293     *out_value = this;
 294   return true;
 295 }
 296
 297 StringValue* StringValue::DeepCopy() const {
 298   return new StringValue(value_);
 299 }
 300
 301 bool StringValue::Equals(const Value* other) const {
 302   if (other->GetType() != GetType())
 303     return false;
 304   std::string lhs, rhs;
 305   return GetAsString(&lhs) && other->GetAsString(&rhs) && lhs == rhs;
 306 }
 307
 308 ///////////////////// BinaryValue ////////////////////
 309
 310 BinaryValue::BinaryValue()
 311     : Value(TYPE_BINARY),
 312       size_(0) {
 313 }
 314
 315 BinaryValue::BinaryValue(scoped_ptr<char[]> buffer, size_t size)
 316     : Value(TYPE_BINARY),
 317       buffer_(buffer.Pass()),
 318       size_(size) {
 319 }
 320
 321 BinaryValue::~BinaryValue() {
 322 }
 323
 324 // static
 325 BinaryValue* BinaryValue::CreateWithCopiedBuffer(const char* buffer,
 326                                                  size_t size) {
 327   char* buffer_copy = new char[size];
 328   memcpy(buffer_copy, buffer, size);
 329   scoped_ptr<char[]> scoped_buffer_copy(buffer_copy);
 330   return new BinaryValue(scoped_buffer_copy.Pass(), size);
 331 }
 332
 333 bool BinaryValue::GetAsBinary(const BinaryValue** out_value) const {
 334   if (out_value)
 335     *out_value = this;
 336   return true;
 337 }
 338
 339 BinaryValue* BinaryValue::DeepCopy() const {
 340   return CreateWithCopiedBuffer(buffer_.get(), size_);
 341 }
 342
 343 bool BinaryValue::Equals(const Value* other) const {
 344   if (other->GetType() != GetType())
 345     return false;
 346   const BinaryValue* other_binary = static_cast<const BinaryValue*>(other);
 347   if (other_binary->size_ != size_)
 348     return false;
 349   return !memcmp(GetBuffer(), other_binary->GetBuffer(), size_);
 350 }
 351
 352 ///////////////////// DictionaryValue ////////////////////
 353
 354 DictionaryValue::DictionaryValue()
 355     : Value(TYPE_DICTIONARY) {
 356 }
 357
 358 DictionaryValue::~DictionaryValue() {
 359   Clear();
 360 }
 361
 362 bool DictionaryValue::GetAsDictionary(DictionaryValue** out_value) {
 363   if (out_value)
 364     *out_value = this;
 365   return true;
 366 }
 367
 368 bool DictionaryValue::GetAsDictionary(const DictionaryValue** out_value) const {
 369   if (out_value)
 370     *out_value = this;
 371   return true;
 372 }
 373
 374 bool DictionaryValue::HasKey(const std::string& key) const {
 375   DCHECK(IsStringUTF8(key));
 376   ValueMap::const_iterator current_entry = dictionary_.find(key);
 377   DCHECK((current_entry == dictionary_.end()) || current_entry->second);
 378   return current_entry != dictionary_.end();
 379 }
 380
 381 void DictionaryValue::Clear() {
 382   ValueMap::iterator dict_iterator = dictionary_.begin();
 383   while (dict_iterator != dictionary_.end()) {
 384     delete dict_iterator->second;
 385     ++dict_iterator;
 386   }
 387
 388   dictionary_.clear();
 389 }
 390
 391 void DictionaryValue::Set(const std::string& path, scoped_ptr<Value> in_value) {
 392   DCHECK(IsStringUTF8(path));
 393   DCHECK(in_value);
 394
 395   std::string current_path(path);
 396   DictionaryValue* current_dictionary = this;
 397   for (size_t delimiter_position = current_path.find('.');
 398        delimiter_position != std::string::npos;
 399        delimiter_position = current_path.find('.')) {
 400     // Assume that we're indexing into a dictionary.
 401     std::string key(current_path, 0, delimiter_position);
 402     DictionaryValue* child_dictionary = NULL;
 403     if (!current_dictionary->GetDictionary(key, &child_dictionary)) {
 404       child_dictionary = new DictionaryValue;
 405       current_dictionary->SetWithoutPathExpansion(key, child_dictionary);
 406     }
 407
 408     current_dictionary = child_dictionary;
 409     current_path.erase(0, delimiter_position + 1);
 410   }
 411
 412   current_dictionary->SetWithoutPathExpansion(current_path, in_value.Pass());
 413 }
 414
 415 void DictionaryValue::Set(const std::string& path, Value* in_value) {
 416   Set(path, make_scoped_ptr(in_value));
 417 }
 418
 419 void DictionaryValue::SetBoolean(const std::string& path, bool in_value) {
 420   Set(path, new FundamentalValue(in_value));
 421 }
 422
 423 void DictionaryValue::SetInteger(const std::string& path, int in_value) {
 424   Set(path, new FundamentalValue(in_value));
 425 }
 426
 427 void DictionaryValue::SetDouble(const std::string& path, double in_value) {
 428   Set(path, new FundamentalValue(in_value));
 429 }
 430
 431 void DictionaryValue::SetString(const std::string& path,
 432                                 const std::string& in_value) {
 433   Set(path, new StringValue(in_value));
 434 }
 435
 436 void DictionaryValue::SetString(const std::string& path,
 437                                 const string16& in_value) {
 438   Set(path, new StringValue(in_value));
 439 }
 440
 441 void DictionaryValue::SetWithoutPathExpansion(const std::string& key,
 442                                               scoped_ptr<Value> in_value) {
 443   Value* bare_ptr = in_value.release();
 444   // If there's an existing value here, we need to delete it, because
 445   // we own all our children.
 446   std::pair<ValueMap::iterator, bool> ins_res =
 447       dictionary_.insert(std::make_pair(key, bare_ptr));
 448   if (!ins_res.second) {
 449     DCHECK_NE(ins_res.first->second, bare_ptr);  // This would be bogus
 450     delete ins_res.first->second;
 451     ins_res.first->second = bare_ptr;
 452   }
 453 }
 454
 455 void DictionaryValue::SetWithoutPathExpansion(const std::string& key,
 456                                               Value* in_value) {
 457   SetWithoutPathExpansion(key, make_scoped_ptr(in_value));
 458 }
 459
 460 void DictionaryValue::SetBooleanWithoutPathExpansion(
 461     const std::string& path, bool in_value) {
 462   SetWithoutPathExpansion(path, new FundamentalValue(in_value));
 463 }
 464
 465 void DictionaryValue::SetIntegerWithoutPathExpansion(
 466     const std::string& path, int in_value) {
 467   SetWithoutPathExpansion(path, new FundamentalValue(in_value));
 468 }
 469
 470 void DictionaryValue::SetDoubleWithoutPathExpansion(
 471     const std::string& path, double in_value) {
 472   SetWithoutPathExpansion(path, new FundamentalValue(in_value));
 473 }
 474
 475 void DictionaryValue::SetStringWithoutPathExpansion(
 476     const std::string& path, const std::string& in_value) {
 477   SetWithoutPathExpansion(path, new StringValue(in_value));
 478 }
 479
 480 void DictionaryValue::SetStringWithoutPathExpansion(
 481     const std::string& path, const string16& in_value) {
 482   SetWithoutPathExpansion(path, new StringValue(in_value));
 483 }
 484
 485 bool DictionaryValue::Get(StringPiece path,
 486                           const Value** out_value) const {
 487   DCHECK(IsStringUTF8(path));
 488   StringPiece current_path(path);
 489   const DictionaryValue* current_dictionary = this;
 490   for (size_t delimiter_position = current_path.find('.');
 491        delimiter_position != std::string::npos;
 492        delimiter_position = current_path.find('.')) {
 493     const DictionaryValue* child_dictionary = NULL;
 494     if (!current_dictionary->GetDictionary(
 495             current_path.substr(0, delimiter_position), &child_dictionary)) {
 496       return false;
 497     }
 498
 499     current_dictionary = child_dictionary;
 500     current_path = current_path.substr(delimiter_position + 1);
 501   }
 502
 503   return current_dictionary->GetWithoutPathExpansion(current_path.as_string(),
 504                                                      out_value);
 505 }
 506
 507 bool DictionaryValue::Get(StringPiece path, Value** out_value)  {
 508   return static_cast<const DictionaryValue&>(*this).Get(
 509       path,
 510       const_cast<const Value**>(out_value));
 511 }
 512
 513 bool DictionaryValue::GetBoolean(const std::string& path,
 514                                  bool* bool_value) const {
 515   const Value* value;
 516   if (!Get(path, &value))
 517     return false;
 518
 519   return value->GetAsBoolean(bool_value);
 520 }
 521
 522 bool DictionaryValue::GetInteger(const std::string& path,
 523                                  int* out_value) const {
 524   const Value* value;
 525   if (!Get(path, &value))
 526     return false;
 527
 528   return value->GetAsInteger(out_value);
 529 }
 530
 531 bool DictionaryValue::GetDouble(const std::string& path,
 532                                 double* out_value) const {
 533   const Value* value;
 534   if (!Get(path, &value))
 535     return false;
 536
 537   return value->GetAsDouble(out_value);
 538 }
 539
 540 bool DictionaryValue::GetString(const std::string& path,
 541                                 std::string* 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::GetString(const std::string& path,
 550                                 string16* out_value) const {
 551   const Value* value;
 552   if (!Get(path, &value))
 553     return false;
 554
 555   return value->GetAsString(out_value);
 556 }
 557
 558 bool DictionaryValue::GetStringASCII(const std::string& path,
 559                                      std::string* out_value) const {
 560   std::string out;
 561   if (!GetString(path, &out))
 562     return false;
 563
 564   if (!IsStringASCII(out)) {
 565     NOTREACHED();
 566     return false;
 567   }
 568
 569   out_value->assign(out);
 570   return true;
 571 }
 572
 573 bool DictionaryValue::GetBinary(const std::string& path,
 574                                 const BinaryValue** out_value) const {
 575   const Value* value;
 576   bool result = Get(path, &value);
 577   if (!result || !value->IsType(TYPE_BINARY))
 578     return false;
 579
 580   if (out_value)
 581     *out_value = static_cast<const BinaryValue*>(value);
 582
 583   return true;
 584 }
 585
 586 bool DictionaryValue::GetBinary(const std::string& path,
 587                                 BinaryValue** out_value) {
 588   return static_cast<const DictionaryValue&>(*this).GetBinary(
 589       path,
 590       const_cast<const BinaryValue**>(out_value));
 591 }
 592
 593 bool DictionaryValue::GetDictionary(StringPiece path,
 594                                     const DictionaryValue** out_value) const {
 595   const Value* value;
 596   bool result = Get(path, &value);
 597   if (!result || !value->IsType(TYPE_DICTIONARY))
 598     return false;
 599
 600   if (out_value)
 601     *out_value = static_cast<const DictionaryValue*>(value);
 602
 603   return true;
 604 }
 605
 606 bool DictionaryValue::GetDictionary(StringPiece path,
 607                                     DictionaryValue** out_value) {
 608   return static_cast<const DictionaryValue&>(*this).GetDictionary(
 609       path,
 610       const_cast<const DictionaryValue**>(out_value));
 611 }
 612
 613 bool DictionaryValue::GetList(const std::string& path,
 614                               const ListValue** out_value) const {
 615   const Value* value;
 616   bool result = Get(path, &value);
 617   if (!result || !value->IsType(TYPE_LIST))
 618     return false;
 619
 620   if (out_value)
 621     *out_value = static_cast<const ListValue*>(value);
 622
 623   return true;
 624 }
 625
 626 bool DictionaryValue::GetList(const std::string& path, ListValue** out_value) {
 627   return static_cast<const DictionaryValue&>(*this).GetList(
 628       path,
 629       const_cast<const ListValue**>(out_value));
 630 }
 631
 632 bool DictionaryValue::GetWithoutPathExpansion(const std::string& key,
 633                                               const Value** out_value) const {
 634   DCHECK(IsStringUTF8(key));
 635   ValueMap::const_iterator entry_iterator = dictionary_.find(key);
 636   if (entry_iterator == dictionary_.end())
 637     return false;
 638
 639   const Value* entry = entry_iterator->second;
 640   if (out_value)
 641     *out_value = entry;
 642   return true;
 643 }
 644
 645 bool DictionaryValue::GetWithoutPathExpansion(const std::string& key,
 646                                               Value** out_value) {
 647   return static_cast<const DictionaryValue&>(*this).GetWithoutPathExpansion(
 648       key,
 649       const_cast<const Value**>(out_value));
 650 }
 651
 652 bool DictionaryValue::GetBooleanWithoutPathExpansion(const std::string& key,
 653                                                      bool* out_value) const {
 654   const Value* value;
 655   if (!GetWithoutPathExpansion(key, &value))
 656     return false;
 657
 658   return value->GetAsBoolean(out_value);
 659 }
 660
 661 bool DictionaryValue::GetIntegerWithoutPathExpansion(const std::string& key,
 662                                                      int* out_value) const {
 663   const Value* value;
 664   if (!GetWithoutPathExpansion(key, &value))
 665     return false;
 666
 667   return value->GetAsInteger(out_value);
 668 }
 669
 670 bool DictionaryValue::GetDoubleWithoutPathExpansion(const std::string& key,
 671                                                     double* out_value) const {
 672   const Value* value;
 673   if (!GetWithoutPathExpansion(key, &value))
 674     return false;
 675
 676   return value->GetAsDouble(out_value);
 677 }
 678
 679 bool DictionaryValue::GetStringWithoutPathExpansion(
 680     const std::string& key,
 681     std::string* 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::GetStringWithoutPathExpansion(const std::string& key,
 690                                                     string16* out_value) const {
 691   const Value* value;
 692   if (!GetWithoutPathExpansion(key, &value))
 693     return false;
 694
 695   return value->GetAsString(out_value);
 696 }
 697
 698 bool DictionaryValue::GetDictionaryWithoutPathExpansion(
 699     const std::string& key,
 700     const DictionaryValue** out_value) const {
 701   const Value* value;
 702   bool result = GetWithoutPathExpansion(key, &value);
 703   if (!result || !value->IsType(TYPE_DICTIONARY))
 704     return false;
 705
 706   if (out_value)
 707     *out_value = static_cast<const DictionaryValue*>(value);
 708
 709   return true;
 710 }
 711
 712 bool DictionaryValue::GetDictionaryWithoutPathExpansion(
 713     const std::string& key,
 714     DictionaryValue** out_value) {
 715   const DictionaryValue& const_this =
 716       static_cast<const DictionaryValue&>(*this);
 717   return const_this.GetDictionaryWithoutPathExpansion(
 718           key,
 719           const_cast<const DictionaryValue**>(out_value));
 720 }
 721
 722 bool DictionaryValue::GetListWithoutPathExpansion(
 723     const std::string& key,
 724     const ListValue** out_value) const {
 725   const Value* value;
 726   bool result = GetWithoutPathExpansion(key, &value);
 727   if (!result || !value->IsType(TYPE_LIST))
 728     return false;
 729
 730   if (out_value)
 731     *out_value = static_cast<const ListValue*>(value);
 732
 733   return true;
 734 }
 735
 736 bool DictionaryValue::GetListWithoutPathExpansion(const std::string& key,
 737                                                   ListValue** out_value) {
 738   return
 739       static_cast<const DictionaryValue&>(*this).GetListWithoutPathExpansion(
 740           key,
 741           const_cast<const ListValue**>(out_value));
 742 }
 743
 744 bool DictionaryValue::Remove(const std::string& path,
 745                              scoped_ptr<Value>* out_value) {
 746   DCHECK(IsStringUTF8(path));
 747   std::string current_path(path);
 748   DictionaryValue* current_dictionary = this;
 749   size_t delimiter_position = current_path.rfind('.');
 750   if (delimiter_position != std::string::npos) {
 751     if (!GetDictionary(current_path.substr(0, delimiter_position),
 752                        &current_dictionary))
 753       return false;
 754     current_path.erase(0, delimiter_position + 1);
 755   }
 756
 757   return current_dictionary->RemoveWithoutPathExpansion(current_path,
 758                                                         out_value);
 759 }
 760
 761 bool DictionaryValue::RemoveWithoutPathExpansion(const std::string& key,
 762                                                  scoped_ptr<Value>* out_value) {
 763   DCHECK(IsStringUTF8(key));
 764   ValueMap::iterator entry_iterator = dictionary_.find(key);
 765   if (entry_iterator == dictionary_.end())
 766     return false;
 767
 768   Value* entry = entry_iterator->second;
 769   if (out_value)
 770     out_value->reset(entry);
 771   else
 772     delete entry;
 773   dictionary_.erase(entry_iterator);
 774   return true;
 775 }
 776
 777 bool DictionaryValue::RemovePath(const std::string& path,
 778                                  scoped_ptr<Value>* out_value) {
 779   bool result = false;
 780   size_t delimiter_position = path.find('.');
 781
 782   if (delimiter_position == std::string::npos)
 783     return RemoveWithoutPathExpansion(path, out_value);
 784
 785   const std::string subdict_path = path.substr(0, delimiter_position);
 786   DictionaryValue* subdict = NULL;
 787   if (!GetDictionary(subdict_path, &subdict))
 788     return false;
 789   result = subdict->RemovePath(path.substr(delimiter_position + 1),
 790                                out_value);
 791   if (result && subdict->empty())
 792     RemoveWithoutPathExpansion(subdict_path, NULL);
 793
 794   return result;
 795 }
 796
 797 scoped_ptr<DictionaryValue> DictionaryValue::DeepCopyWithoutEmptyChildren()
 798     const {
 799   scoped_ptr<DictionaryValue> copy = CopyDictionaryWithoutEmptyChildren(*this);
 800   if (!copy)
 801     copy.reset(new DictionaryValue);
 802   return copy;
 803 }
 804
 805 void DictionaryValue::MergeDictionary(const DictionaryValue* dictionary) {
 806   for (DictionaryValue::Iterator it(*dictionary); !it.IsAtEnd(); it.Advance()) {
 807     const Value* merge_value = &it.value();
 808     // Check whether we have to merge dictionaries.
 809     if (merge_value->IsType(Value::TYPE_DICTIONARY)) {
 810       DictionaryValue* sub_dict;
 811       if (GetDictionaryWithoutPathExpansion(it.key(), &sub_dict)) {
 812         sub_dict->MergeDictionary(
 813             static_cast<const DictionaryValue*>(merge_value));
 814         continue;
 815       }
 816     }
 817     // All other cases: Make a copy and hook it up.
 818     SetWithoutPathExpansion(it.key(), merge_value->DeepCopy());
 819   }
 820 }
 821
 822 void DictionaryValue::Swap(DictionaryValue* other) {
 823   dictionary_.swap(other->dictionary_);
 824 }
 825
 826 DictionaryValue::Iterator::Iterator(const DictionaryValue& target)
 827     : target_(target),
 828       it_(target.dictionary_.begin()) {}
 829
 830 DictionaryValue::Iterator::~Iterator() {}
 831
 832 DictionaryValue* DictionaryValue::DeepCopy() const {
 833   DictionaryValue* result = new DictionaryValue;
 834
 835   for (ValueMap::const_iterator current_entry(dictionary_.begin());
 836        current_entry != dictionary_.end(); ++current_entry) {
 837     result->SetWithoutPathExpansion(current_entry->first,
 838                                     current_entry->second->DeepCopy());
 839   }
 840
 841   return result;
 842 }
 843
 844 scoped_ptr<DictionaryValue> DictionaryValue::CreateDeepCopy() const {
 845   return make_scoped_ptr(DeepCopy());
 846 }
 847
 848 bool DictionaryValue::Equals(const Value* other) const {
 849   if (other->GetType() != GetType())
 850     return false;
 851
 852   const DictionaryValue* other_dict =
 853       static_cast<const DictionaryValue*>(other);
 854   Iterator lhs_it(*this);
 855   Iterator rhs_it(*other_dict);
 856   while (!lhs_it.IsAtEnd() && !rhs_it.IsAtEnd()) {
 857     if (lhs_it.key() != rhs_it.key() ||
 858         !lhs_it.value().Equals(&rhs_it.value())) {
 859       return false;
 860     }
 861     lhs_it.Advance();
 862     rhs_it.Advance();
 863   }
 864   if (!lhs_it.IsAtEnd() || !rhs_it.IsAtEnd())
 865     return false;
 866
 867   return true;
 868 }
 869
 870 ///////////////////// ListValue ////////////////////
 871
 872 ListValue::ListValue() : Value(TYPE_LIST) {
 873 }
 874
 875 ListValue::~ListValue() {
 876   Clear();
 877 }
 878
 879 void ListValue::Clear() {
 880   for (ValueVector::iterator i(list_.begin()); i != list_.end(); ++i)
 881     delete *i;
 882   list_.clear();
 883 }
 884
 885 bool ListValue::Set(size_t index, Value* in_value) {
 886   if (!in_value)
 887     return false;
 888
 889   if (index >= list_.size()) {
 890     // Pad out any intermediate indexes with null settings
 891     while (index > list_.size())
 892       Append(CreateNullValue());
 893     Append(in_value);
 894   } else {
 895     DCHECK(list_[index] != in_value);
 896     delete list_[index];
 897     list_[index] = in_value;
 898   }
 899   return true;
 900 }
 901
 902 bool ListValue::Set(size_t index, scoped_ptr<Value> in_value) {
 903   return Set(index, in_value.release());
 904 }
 905
 906 bool ListValue::Get(size_t index, const Value** out_value) const {
 907   if (index >= list_.size())
 908     return false;
 909
 910   if (out_value)
 911     *out_value = list_[index];
 912
 913   return true;
 914 }
 915
 916 bool ListValue::Get(size_t index, Value** out_value) {
 917   return static_cast<const ListValue&>(*this).Get(
 918       index,
 919       const_cast<const Value**>(out_value));
 920 }
 921
 922 bool ListValue::GetBoolean(size_t index, bool* bool_value) const {
 923   const Value* value;
 924   if (!Get(index, &value))
 925     return false;
 926
 927   return value->GetAsBoolean(bool_value);
 928 }
 929
 930 bool ListValue::GetInteger(size_t index, int* out_value) const {
 931   const Value* value;
 932   if (!Get(index, &value))
 933     return false;
 934
 935   return value->GetAsInteger(out_value);
 936 }
 937
 938 bool ListValue::GetDouble(size_t index, double* out_value) const {
 939   const Value* value;
 940   if (!Get(index, &value))
 941     return false;
 942
 943   return value->GetAsDouble(out_value);
 944 }
 945
 946 bool ListValue::GetString(size_t index, std::string* out_value) const {
 947   const Value* value;
 948   if (!Get(index, &value))
 949     return false;
 950
 951   return value->GetAsString(out_value);
 952 }
 953
 954 bool ListValue::GetString(size_t index, string16* out_value) const {
 955   const Value* value;
 956   if (!Get(index, &value))
 957     return false;
 958
 959   return value->GetAsString(out_value);
 960 }
 961
 962 bool ListValue::GetBinary(size_t index, const BinaryValue** out_value) const {
 963   const Value* value;
 964   bool result = Get(index, &value);
 965   if (!result || !value->IsType(TYPE_BINARY))
 966     return false;
 967
 968   if (out_value)
 969     *out_value = static_cast<const BinaryValue*>(value);
 970
 971   return true;
 972 }
 973
 974 bool ListValue::GetBinary(size_t index, BinaryValue** out_value) {
 975   return static_cast<const ListValue&>(*this).GetBinary(
 976       index,
 977       const_cast<const BinaryValue**>(out_value));
 978 }
 979
 980 bool ListValue::GetDictionary(size_t index,
 981                               const DictionaryValue** out_value) const {
 982   const Value* value;
 983   bool result = Get(index, &value);
 984   if (!result || !value->IsType(TYPE_DICTIONARY))
 985     return false;
 986
 987   if (out_value)
 988     *out_value = static_cast<const DictionaryValue*>(value);
 989
 990   return true;
 991 }
 992
 993 bool ListValue::GetDictionary(size_t index, DictionaryValue** out_value) {
 994   return static_cast<const ListValue&>(*this).GetDictionary(
 995       index,
 996       const_cast<const DictionaryValue**>(out_value));
 997 }
 998
 999 bool ListValue::GetList(size_t index, const ListValue** out_value) const {
1000   const Value* value;
1001   bool result = Get(index, &value);
1002   if (!result || !value->IsType(TYPE_LIST))
1003     return false;
1004
1005   if (out_value)
1006     *out_value = static_cast<const ListValue*>(value);
1007
1008   return true;
1009 }
1010
1011 bool ListValue::GetList(size_t index, ListValue** out_value) {
1012   return static_cast<const ListValue&>(*this).GetList(
1013       index,
1014       const_cast<const ListValue**>(out_value));
1015 }
1016
1017 bool ListValue::Remove(size_t index, scoped_ptr<Value>* out_value) {
1018   if (index >= list_.size())
1019     return false;
1020
1021   if (out_value)
1022     out_value->reset(list_[index]);
1023   else
1024     delete list_[index];
1025
1026   list_.erase(list_.begin() + index);
1027   return true;
1028 }
1029
1030 bool ListValue::Remove(const Value& value, size_t* index) {
1031   for (ValueVector::iterator i(list_.begin()); i != list_.end(); ++i) {
1032     if ((*i)->Equals(&value)) {
1033       size_t previous_index = i - list_.begin();
1034       delete *i;
1035       list_.erase(i);
1036
1037       if (index)
1038         *index = previous_index;
1039       return true;
1040     }
1041   }
1042   return false;
1043 }
1044
1045 ListValue::iterator ListValue::Erase(iterator iter,
1046                                      scoped_ptr<Value>* out_value) {
1047   if (out_value)
1048     out_value->reset(*iter);
1049   else
1050     delete *iter;
1051
1052   return list_.erase(iter);
1053 }
1054
1055 void ListValue::Append(scoped_ptr<Value> in_value) {
1056   Append(in_value.release());
1057 }
1058
1059 void ListValue::Append(Value* in_value) {
1060   DCHECK(in_value);
1061   list_.push_back(in_value);
1062 }
1063
1064 void ListValue::AppendBoolean(bool in_value) {
1065   Append(new FundamentalValue(in_value));
1066 }
1067
1068 void ListValue::AppendInteger(int in_value) {
1069   Append(new FundamentalValue(in_value));
1070 }
1071
1072 void ListValue::AppendDouble(double in_value) {
1073   Append(new FundamentalValue(in_value));
1074 }
1075
1076 void ListValue::AppendString(const std::string& in_value) {
1077   Append(new StringValue(in_value));
1078 }
1079
1080 void ListValue::AppendString(const string16& in_value) {
1081   Append(new StringValue(in_value));
1082 }
1083
1084 void ListValue::AppendStrings(const std::vector<std::string>& in_values) {
1085   for (std::vector<std::string>::const_iterator it = in_values.begin();
1086        it != in_values.end(); ++it) {
1087     AppendString(*it);
1088   }
1089 }
1090
1091 void ListValue::AppendStrings(const std::vector<string16>& in_values) {
1092   for (std::vector<string16>::const_iterator it = in_values.begin();
1093        it != in_values.end(); ++it) {
1094     AppendString(*it);
1095   }
1096 }
1097
1098 bool ListValue::AppendIfNotPresent(Value* in_value) {
1099   DCHECK(in_value);
1100   for (ValueVector::const_iterator i(list_.begin()); i != list_.end(); ++i) {
1101     if ((*i)->Equals(in_value)) {
1102       delete in_value;
1103       return false;
1104     }
1105   }
1106   list_.push_back(in_value);
1107   return true;
1108 }
1109
1110 bool ListValue::Insert(size_t index, Value* in_value) {
1111   DCHECK(in_value);
1112   if (index > list_.size())
1113     return false;
1114
1115   list_.insert(list_.begin() + index, in_value);
1116   return true;
1117 }
1118
1119 ListValue::const_iterator ListValue::Find(const Value& value) const {
1120   return std::find_if(list_.begin(), list_.end(), ValueEquals(&value));
1121 }
1122
1123 void ListValue::Swap(ListValue* other) {
1124   list_.swap(other->list_);
1125 }
1126
1127 bool ListValue::GetAsList(ListValue** out_value) {
1128   if (out_value)
1129     *out_value = this;
1130   return true;
1131 }
1132
1133 bool ListValue::GetAsList(const ListValue** out_value) const {
1134   if (out_value)
1135     *out_value = this;
1136   return true;
1137 }
1138
1139 ListValue* ListValue::DeepCopy() const {
1140   ListValue* result = new ListValue;
1141
1142   for (ValueVector::const_iterator i(list_.begin()); i != list_.end(); ++i)
1143     result->Append((*i)->DeepCopy());
1144
1145   return result;
1146 }
1147
1148 scoped_ptr<ListValue> ListValue::CreateDeepCopy() const {
1149   return make_scoped_ptr(DeepCopy());
1150 }
1151
1152 bool ListValue::Equals(const Value* other) const {
1153   if (other->GetType() != GetType())
1154     return false;
1155
1156   const ListValue* other_list =
1157       static_cast<const ListValue*>(other);
1158   const_iterator lhs_it, rhs_it;
1159   for (lhs_it = begin(), rhs_it = other_list->begin();
1160        lhs_it != end() && rhs_it != other_list->end();
1161        ++lhs_it, ++rhs_it) {
1162     if (!(*lhs_it)->Equals(*rhs_it))
1163       return false;
1164   }
1165   if (lhs_it != end() || rhs_it != other_list->end())
1166     return false;
1167
1168   return true;
1169 }
1170
1171 ValueSerializer::~ValueSerializer() {
1172 }
1173
1174 ValueDeserializer::~ValueDeserializer() {
1175 }
1176
1177 std::ostream& operator<<(std::ostream& out, const Value& value) {
1178   std::string json;
1179   JSONWriter::WriteWithOptions(value, JSONWriter::OPTIONS_PRETTY_PRINT, &json);
1180   return out << json;
1181 }
1182
1183 }  // namespace base