JsonCpp - JSON data format manipulation library

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json_value.cpp
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1 // Copyright 2011 Baptiste Lepilleur
2 // Distributed under MIT license, or public domain if desired and
3 // recognized in your jurisdiction.
4 // See file LICENSE for detail or copy at http://jsoncpp.sourceforge.net/LICENSE
5
6 #if !defined(JSON_IS_AMALGAMATION)
7 #include <json/assertions.h>
8 #include <json/value.h>
9 #include <json/writer.h>
10 #endif // if !defined(JSON_IS_AMALGAMATION)
11 #include <math.h>
12 #include <sstream>
13 #include <utility>
14 #include <cstring>
15 #include <cassert>
16 #ifdef JSON_USE_CPPTL
17 #include <cpptl/conststring.h>
18 #endif
19 #include <cstddef> // size_t
20 #include <algorithm> // min()
21
22 #define JSON_ASSERT_UNREACHABLE assert(false)
23
24 namespace Json {
25
26 // This is a walkaround to avoid the static initialization of Value::null.
27 // kNull must be word-aligned to avoid crashing on ARM. We use an alignment of
28 // 8 (instead of 4) as a bit of future-proofing.
29 #if defined(__ARMEL__)
30 #define ALIGNAS(byte_alignment) __attribute__((aligned(byte_alignment)))
31 #else
32 #define ALIGNAS(byte_alignment)
33 #endif
34 //static const unsigned char ALIGNAS(8) kNull[sizeof(Value)] = { 0 };
35 //const unsigned char& kNullRef = kNull[0];
36 //const Value& Value::null = reinterpret_cast<const Value&>(kNullRef);
37 //const Value& Value::nullRef = null;
38
39 // static
40 Value const& Value::nullSingleton()
41 {
42 static Value const nullStatic;
43 return nullStatic;
44 }
45
46 // for backwards compatibility, we'll leave these global references around, but DO NOT
47 // use them in JSONCPP library code any more!
48 Value const& Value::null = Value::nullSingleton();
49 Value const& Value::nullRef = Value::nullSingleton();
50
51 const Int Value::minInt = Int(~(UInt(-1) / 2));
52 const Int Value::maxInt = Int(UInt(-1) / 2);
53 const UInt Value::maxUInt = UInt(-1);
54 #if defined(JSON_HAS_INT64)
55 const Int64 Value::minInt64 = Int64(~(UInt64(-1) / 2));
56 const Int64 Value::maxInt64 = Int64(UInt64(-1) / 2);
57 const UInt64 Value::maxUInt64 = UInt64(-1);
58 // The constant is hard-coded because some compiler have trouble
59 // converting Value::maxUInt64 to a double correctly (AIX/xlC).
60 // Assumes that UInt64 is a 64 bits integer.
61 static const double maxUInt64AsDouble = 18446744073709551615.0;
62 #endif // defined(JSON_HAS_INT64)
63 const LargestInt Value::minLargestInt = LargestInt(~(LargestUInt(-1) / 2));
64 const LargestInt Value::maxLargestInt = LargestInt(LargestUInt(-1) / 2);
65 const LargestUInt Value::maxLargestUInt = LargestUInt(-1);
66
67 #if !defined(JSON_USE_INT64_DOUBLE_CONVERSION)
68 template <typename T, typename U>
69 static inline bool InRange(double d, T min, U max) {
70 // The casts can lose precision, but we are looking only for
71 // an approximate range. Might fail on edge cases though. ~cdunn
72 //return d >= static_cast<double>(min) && d <= static_cast<double>(max);
73 return d >= min && d <= max;
74 }
75 #else // if !defined(JSON_USE_INT64_DOUBLE_CONVERSION)
76 static inline double integerToDouble(Json::UInt64 value) {
77 return static_cast<double>(Int64(value / 2)) * 2.0 + static_cast<double>(Int64(value & 1));
78 }
79
80 template <typename T> static inline double integerToDouble(T value) {
81 return static_cast<double>(value);
82 }
83
84 template <typename T, typename U>
85 static inline bool InRange(double d, T min, U max) {
86 return d >= integerToDouble(min) && d <= integerToDouble(max);
87 }
88 #endif // if !defined(JSON_USE_INT64_DOUBLE_CONVERSION)
89
97 static inline char* duplicateStringValue(const char* value,
98 size_t length)
99 {
100 // Avoid an integer overflow in the call to malloc below by limiting length
101 // to a sane value.
102 if (length >= static_cast<size_t>(Value::maxInt))
103 length = Value::maxInt - 1;
104
105 char* newString = static_cast<char*>(malloc(length + 1));
106 if (newString == NULL) {
107 throwRuntimeError(
108 "in Json::Value::duplicateStringValue(): "
109 "Failed to allocate string value buffer");
110 }
111 memcpy(newString, value, length);
112 newString[length] = 0;
113 return newString;
114 }
115
116 /* Record the length as a prefix.
117 */
118 static inline char* duplicateAndPrefixStringValue(
119 const char* value,
120 unsigned int length)
121 {
122 // Avoid an integer overflow in the call to malloc below by limiting length
123 // to a sane value.
124 JSON_ASSERT_MESSAGE(length <= static_cast<unsigned>(Value::maxInt) - sizeof(unsigned) - 1U,
125 "in Json::Value::duplicateAndPrefixStringValue(): "
126 "length too big for prefixing");
127 unsigned actualLength = length + static_cast<unsigned>(sizeof(unsigned)) + 1U;
128 char* newString = static_cast<char*>(malloc(actualLength));
129 if (newString == 0) {
130 throwRuntimeError(
131 "in Json::Value::duplicateAndPrefixStringValue(): "
132 "Failed to allocate string value buffer");
133 }
134 *reinterpret_cast<unsigned*>(newString) = length;
135 memcpy(newString + sizeof(unsigned), value, length);
136 newString[actualLength - 1U] = 0; // to avoid buffer over-run accidents by users later
137 return newString;
138 }
139 inline static void decodePrefixedString(
140 bool isPrefixed, char const* prefixed,
141 unsigned* length, char const** value)
142 {
143 if (!isPrefixed) {
144 *length = static_cast<unsigned>(strlen(prefixed));
145 *value = prefixed;
146 } else {
147 *length = *reinterpret_cast<unsigned const*>(prefixed);
148 *value = prefixed + sizeof(unsigned);
149 }
150 }
153 #if JSONCPP_USING_SECURE_MEMORY
154 static inline void releasePrefixedStringValue(char* value) {
155 unsigned length = 0;
156 char const* valueDecoded;
157 decodePrefixedString(true, value, &length, &valueDecoded);
158 size_t const size = sizeof(unsigned) + length + 1U;
159 memset(value, 0, size);
160 free(value);
161 }
162 static inline void releaseStringValue(char* value, unsigned length) {
163 // length==0 => we allocated the strings memory
164 size_t size = (length==0) ? strlen(value) : length;
165 memset(value, 0, size);
166 free(value);
167 }
168 #else // !JSONCPP_USING_SECURE_MEMORY
169 static inline void releasePrefixedStringValue(char* value) {
170 free(value);
171 }
172 static inline void releaseStringValue(char* value, unsigned) {
173 free(value);
174 }
175 #endif // JSONCPP_USING_SECURE_MEMORY
176
177 } // namespace Json
178
179 // //////////////////////////////////////////////////////////////////
180 // //////////////////////////////////////////////////////////////////
181 // //////////////////////////////////////////////////////////////////
182 // ValueInternals...
183 // //////////////////////////////////////////////////////////////////
184 // //////////////////////////////////////////////////////////////////
185 // //////////////////////////////////////////////////////////////////
186 #if !defined(JSON_IS_AMALGAMATION)
187
188 #include "json_valueiterator.inl"
189 #endif // if !defined(JSON_IS_AMALGAMATION)
190
191 namespace Json {
192
193 Exception::Exception(JSONCPP_STRING const& msg)
194 : msg_(msg)
195 {}
196 Exception::~Exception() JSONCPP_NOEXCEPT
197 {}
198 char const* Exception::what() const JSONCPP_NOEXCEPT
199 {
200 return msg_.c_str();
201 }
202 RuntimeError::RuntimeError(JSONCPP_STRING const& msg)
203 : Exception(msg)
204 {}
205 LogicError::LogicError(JSONCPP_STRING const& msg)
206 : Exception(msg)
207 {}
208 JSONCPP_NORETURN void throwRuntimeError(JSONCPP_STRING const& msg)
209 {
210 throw RuntimeError(msg);
211 }
212 JSONCPP_NORETURN void throwLogicError(JSONCPP_STRING const& msg)
213 {
214 throw LogicError(msg);
215 }
216
217 // //////////////////////////////////////////////////////////////////
218 // //////////////////////////////////////////////////////////////////
219 // //////////////////////////////////////////////////////////////////
220 // class Value::CommentInfo
221 // //////////////////////////////////////////////////////////////////
222 // //////////////////////////////////////////////////////////////////
223 // //////////////////////////////////////////////////////////////////
224
225 Value::CommentInfo::CommentInfo() : comment_(0)
226 {}
227
228 Value::CommentInfo::~CommentInfo() {
229 if (comment_)
230 releaseStringValue(comment_, 0u);
231 }
232
233 void Value::CommentInfo::setComment(const char* text, size_t len) {
234 if (comment_) {
235 releaseStringValue(comment_, 0u);
236 comment_ = 0;
237 }
238 JSON_ASSERT(text != 0);
239 JSON_ASSERT_MESSAGE(
240 text[0] == '\0' || text[0] == '/',
241 "in Json::Value::setComment(): Comments must start with /");
242 // It seems that /**/ style comments are acceptable as well.
243 comment_ = duplicateStringValue(text, len);
244 }
245
246 // //////////////////////////////////////////////////////////////////
247 // //////////////////////////////////////////////////////////////////
248 // //////////////////////////////////////////////////////////////////
249 // class Value::CZString
250 // //////////////////////////////////////////////////////////////////
251 // //////////////////////////////////////////////////////////////////
252 // //////////////////////////////////////////////////////////////////
253
254 // Notes: policy_ indicates if the string was allocated when
255 // a string is stored.
256
257 Value::CZString::CZString(ArrayIndex aindex) : cstr_(0), index_(aindex) {}
258
259 Value::CZString::CZString(char const* str, unsigned ulength, DuplicationPolicy allocate)
260 : cstr_(str) {
261 // allocate != duplicate
262 storage_.policy_ = allocate & 0x3;
263 storage_.length_ = ulength & 0x3FFFFFFF;
264 }
265
266 Value::CZString::CZString(const CZString& other) {
267 cstr_ = (other.storage_.policy_ != noDuplication && other.cstr_ != 0
268 ? duplicateStringValue(other.cstr_, other.storage_.length_)
269 : other.cstr_);
270 storage_.policy_ = static_cast<unsigned>(other.cstr_
271 ? (static_cast<DuplicationPolicy>(other.storage_.policy_) == noDuplication
272 ? noDuplication : duplicate)
273 : static_cast<DuplicationPolicy>(other.storage_.policy_)) & 3U;
274 storage_.length_ = other.storage_.length_;
275 }
276
277 #if JSON_HAS_RVALUE_REFERENCES
278 Value::CZString::CZString(CZString&& other)
279 : cstr_(other.cstr_), index_(other.index_) {
280 other.cstr_ = nullptr;
281 }
282 #endif
283
284 Value::CZString::~CZString() {
285 if (cstr_ && storage_.policy_ == duplicate) {
286 releaseStringValue(const_cast<char*>(cstr_), storage_.length_ + 1u); //+1 for null terminating character for sake of completeness but not actually necessary
287 }
288 }
289
290 void Value::CZString::swap(CZString& other) {
291 std::swap(cstr_, other.cstr_);
292 std::swap(index_, other.index_);
293 }
294
295 Value::CZString& Value::CZString::operator=(CZString other) {
296 swap(other);
297 return *this;
298 }
299
300 bool Value::CZString::operator<(const CZString& other) const {
301 if (!cstr_) return index_ < other.index_;
302 //return strcmp(cstr_, other.cstr_) < 0;
303 // Assume both are strings.
304 unsigned this_len = this->storage_.length_;
305 unsigned other_len = other.storage_.length_;
306 unsigned min_len = std::min<unsigned>(this_len, other_len);
307 JSON_ASSERT(this->cstr_ && other.cstr_);
308 int comp = memcmp(this->cstr_, other.cstr_, min_len);
309 if (comp < 0) return true;
310 if (comp > 0) return false;
311 return (this_len < other_len);
312 }
313
314 bool Value::CZString::operator==(const CZString& other) const {
315 if (!cstr_) return index_ == other.index_;
316 //return strcmp(cstr_, other.cstr_) == 0;
317 // Assume both are strings.
318 unsigned this_len = this->storage_.length_;
319 unsigned other_len = other.storage_.length_;
320 if (this_len != other_len) return false;
321 JSON_ASSERT(this->cstr_ && other.cstr_);
322 int comp = memcmp(this->cstr_, other.cstr_, this_len);
323 return comp == 0;
324 }
325
326 ArrayIndex Value::CZString::index() const { return index_; }
327
328 //const char* Value::CZString::c_str() const { return cstr_; }
329 const char* Value::CZString::data() const { return cstr_; }
330 unsigned Value::CZString::length() const { return storage_.length_; }
331 bool Value::CZString::isStaticString() const { return storage_.policy_ == noDuplication; }
332
333 // //////////////////////////////////////////////////////////////////
334 // //////////////////////////////////////////////////////////////////
335 // //////////////////////////////////////////////////////////////////
336 // class Value::Value
337 // //////////////////////////////////////////////////////////////////
338 // //////////////////////////////////////////////////////////////////
339 // //////////////////////////////////////////////////////////////////
340
345 Value::Value(ValueType vtype) {
346 static char const emptyString[] = "";
347 initBasic(vtype);
348 switch (vtype) {
349 case nullValue:
350 break;
351 case intValue:
352 case uintValue:
353 value_.int_ = 0;
354 break;
355 case realValue:
356 value_.real_ = 0.0;
357 break;
358 case stringValue:
359 // allocated_ == false, so this is safe.
360 value_.string_ = const_cast<char*>(static_cast<char const*>(emptyString));
361 break;
362 case arrayValue:
363 case objectValue:
364 value_.map_ = new ObjectValues();
365 break;
366 case booleanValue:
367 value_.bool_ = false;
368 break;
369 default:
370 JSON_ASSERT_UNREACHABLE;
371 }
372 }
373
374 Value::Value(Int value) {
375 initBasic(intValue);
376 value_.int_ = value;
377 }
378
379 Value::Value(UInt value) {
380 initBasic(uintValue);
381 value_.uint_ = value;
382 }
383 #if defined(JSON_HAS_INT64)
384 Value::Value(Int64 value) {
385 initBasic(intValue);
386 value_.int_ = value;
387 }
388 Value::Value(UInt64 value) {
389 initBasic(uintValue);
390 value_.uint_ = value;
391 }
392 #endif // defined(JSON_HAS_INT64)
393
394 Value::Value(double value) {
395 initBasic(realValue);
396 value_.real_ = value;
397 }
398
399 Value::Value(const char* value) {
400 initBasic(stringValue, true);
401 JSON_ASSERT_MESSAGE(value != NULL, "Null Value Passed to Value Constructor");
402 value_.string_ = duplicateAndPrefixStringValue(value, static_cast<unsigned>(strlen(value)));
403 }
404
405 Value::Value(const char* beginValue, const char* endValue) {
406 initBasic(stringValue, true);
407 value_.string_ =
408 duplicateAndPrefixStringValue(beginValue, static_cast<unsigned>(endValue - beginValue));
409 }
410
411 Value::Value(const JSONCPP_STRING& value) {
412 initBasic(stringValue, true);
413 value_.string_ =
414 duplicateAndPrefixStringValue(value.data(), static_cast<unsigned>(value.length()));
415 }
416
417 Value::Value(const StaticString& value) {
418 initBasic(stringValue);
419 value_.string_ = const_cast<char*>(value.c_str());
420 }
421
422 #ifdef JSON_USE_CPPTL
423 Value::Value(const CppTL::ConstString& value) {
424 initBasic(stringValue, true);
425 value_.string_ = duplicateAndPrefixStringValue(value, static_cast<unsigned>(value.length()));
426 }
427 #endif
428
429 Value::Value(bool value) {
430 initBasic(booleanValue);
431 value_.bool_ = value;
432 }
433
434 Value::Value(Value const& other)
435 : type_(other.type_), allocated_(false)
436 ,
437 comments_(0), start_(other.start_), limit_(other.limit_)
438 {
439 switch (type_) {
440 case nullValue:
441 case intValue:
442 case uintValue:
443 case realValue:
444 case booleanValue:
445 value_ = other.value_;
446 break;
447 case stringValue:
448 if (other.value_.string_ && other.allocated_) {
449 unsigned len;
450 char const* str;
451 decodePrefixedString(other.allocated_, other.value_.string_,
452 &len, &str);
453 value_.string_ = duplicateAndPrefixStringValue(str, len);
454 allocated_ = true;
455 } else {
456 value_.string_ = other.value_.string_;
457 allocated_ = false;
458 }
459 break;
460 case arrayValue:
461 case objectValue:
462 value_.map_ = new ObjectValues(*other.value_.map_);
463 break;
464 default:
465 JSON_ASSERT_UNREACHABLE;
466 }
467 if (other.comments_) {
468 comments_ = new CommentInfo[numberOfCommentPlacement];
469 for (int comment = 0; comment < numberOfCommentPlacement; ++comment) {
470 const CommentInfo& otherComment = other.comments_[comment];
471 if (otherComment.comment_)
472 comments_[comment].setComment(
473 otherComment.comment_, strlen(otherComment.comment_));
474 }
475 }
476 }
477
478 #if JSON_HAS_RVALUE_REFERENCES
479 // Move constructor
480 Value::Value(Value&& other) {
481 initBasic(nullValue);
482 swap(other);
483 }
484 #endif
485
486 Value::~Value() {
487 switch (type_) {
488 case nullValue:
489 case intValue:
490 case uintValue:
491 case realValue:
492 case booleanValue:
493 break;
494 case stringValue:
495 if (allocated_)
496 releasePrefixedStringValue(value_.string_);
497 break;
498 case arrayValue:
499 case objectValue:
500 delete value_.map_;
501 break;
502 default:
503 JSON_ASSERT_UNREACHABLE;
504 }
505
506 delete[] comments_;
507
508 value_.uint_ = 0;
509 }
510
511 Value& Value::operator=(Value other) {
512 swap(other);
513 return *this;
514 }
515
516 void Value::swapPayload(Value& other) {
517 ValueType temp = type_;
518 type_ = other.type_;
519 other.type_ = temp;
520 std::swap(value_, other.value_);
521 int temp2 = allocated_;
522 allocated_ = other.allocated_;
523 other.allocated_ = temp2 & 0x1;
524 }
525
526 void Value::swap(Value& other) {
527 swapPayload(other);
528 std::swap(comments_, other.comments_);
529 std::swap(start_, other.start_);
530 std::swap(limit_, other.limit_);
531 }
532
533 ValueType Value::type() const { return type_; }
534
535 int Value::compare(const Value& other) const {
536 if (*this < other)
537 return -1;
538 if (*this > other)
539 return 1;
540 return 0;
541 }
542
543 bool Value::operator<(const Value& other) const {
544 int typeDelta = type_ - other.type_;
545 if (typeDelta)
546 return typeDelta < 0 ? true : false;
547 switch (type_) {
548 case nullValue:
549 return false;
550 case intValue:
551 return value_.int_ < other.value_.int_;
552 case uintValue:
553 return value_.uint_ < other.value_.uint_;
554 case realValue:
555 return value_.real_ < other.value_.real_;
556 case booleanValue:
557 return value_.bool_ < other.value_.bool_;
558 case stringValue:
559 {
560 if ((value_.string_ == 0) || (other.value_.string_ == 0)) {
561 if (other.value_.string_) return true;
562 else return false;
563 }
564 unsigned this_len;
565 unsigned other_len;
566 char const* this_str;
567 char const* other_str;
568 decodePrefixedString(this->allocated_, this->value_.string_, &this_len, &this_str);
569 decodePrefixedString(other.allocated_, other.value_.string_, &other_len, &other_str);
570 unsigned min_len = std::min<unsigned>(this_len, other_len);
571 JSON_ASSERT(this_str && other_str);
572 int comp = memcmp(this_str, other_str, min_len);
573 if (comp < 0) return true;
574 if (comp > 0) return false;
575 return (this_len < other_len);
576 }
577 case arrayValue:
578 case objectValue: {
579 int delta = int(value_.map_->size() - other.value_.map_->size());
580 if (delta)
581 return delta < 0;
582 return (*value_.map_) < (*other.value_.map_);
583 }
584 default:
585 JSON_ASSERT_UNREACHABLE;
586 }
587 return false; // unreachable
588 }
589
590 bool Value::operator<=(const Value& other) const { return !(other < *this); }
591
592 bool Value::operator>=(const Value& other) const { return !(*this < other); }
593
594 bool Value::operator>(const Value& other) const { return other < *this; }
595
596 bool Value::operator==(const Value& other) const {
597 // if ( type_ != other.type_ )
598 // GCC 2.95.3 says:
599 // attempt to take address of bit-field structure member `Json::Value::type_'
600 // Beats me, but a temp solves the problem.
601 int temp = other.type_;
602 if (type_ != temp)
603 return false;
604 switch (type_) {
605 case nullValue:
606 return true;
607 case intValue:
608 return value_.int_ == other.value_.int_;
609 case uintValue:
610 return value_.uint_ == other.value_.uint_;
611 case realValue:
612 return value_.real_ == other.value_.real_;
613 case booleanValue:
614 return value_.bool_ == other.value_.bool_;
615 case stringValue:
616 {
617 if ((value_.string_ == 0) || (other.value_.string_ == 0)) {
618 return (value_.string_ == other.value_.string_);
619 }
620 unsigned this_len;
621 unsigned other_len;
622 char const* this_str;
623 char const* other_str;
624 decodePrefixedString(this->allocated_, this->value_.string_, &this_len, &this_str);
625 decodePrefixedString(other.allocated_, other.value_.string_, &other_len, &other_str);
626 if (this_len != other_len) return false;
627 JSON_ASSERT(this_str && other_str);
628 int comp = memcmp(this_str, other_str, this_len);
629 return comp == 0;
630 }
631 case arrayValue:
632 case objectValue:
633 return value_.map_->size() == other.value_.map_->size() &&
634 (*value_.map_) == (*other.value_.map_);
635 default:
636 JSON_ASSERT_UNREACHABLE;
637 }
638 return false; // unreachable
639 }
640
641 bool Value::operator!=(const Value& other) const { return !(*this == other); }
642
643 const char* Value::asCString() const {
644 JSON_ASSERT_MESSAGE(type_ == stringValue,
645 "in Json::Value::asCString(): requires stringValue");
646 if (value_.string_ == 0) return 0;
647 unsigned this_len;
648 char const* this_str;
649 decodePrefixedString(this->allocated_, this->value_.string_, &this_len, &this_str);
650 return this_str;
651 }
652
653 #if JSONCPP_USING_SECURE_MEMORY
654 unsigned Value::getCStringLength() const {
655 JSON_ASSERT_MESSAGE(type_ == stringValue,
656 "in Json::Value::asCString(): requires stringValue");
657 if (value_.string_ == 0) return 0;
658 unsigned this_len;
659 char const* this_str;
660 decodePrefixedString(this->allocated_, this->value_.string_, &this_len, &this_str);
661 return this_len;
662 }
663 #endif
664
665 bool Value::getString(char const** str, char const** cend) const {
666 if (type_ != stringValue) return false;
667 if (value_.string_ == 0) return false;
668 unsigned length;
669 decodePrefixedString(this->allocated_, this->value_.string_, &length, str);
670 *cend = *str + length;
671 return true;
672 }
673
674 JSONCPP_STRING Value::asString() const {
675 switch (type_) {
676 case nullValue:
677 return "";
678 case stringValue:
679 {
680 if (value_.string_ == 0) return "";
681 unsigned this_len;
682 char const* this_str;
683 decodePrefixedString(this->allocated_, this->value_.string_, &this_len, &this_str);
684 return JSONCPP_STRING(this_str, this_len);
685 }
686 case booleanValue:
687 return value_.bool_ ? "true" : "false";
688 case intValue:
689 return valueToString(value_.int_);
690 case uintValue:
691 return valueToString(value_.uint_);
692 case realValue:
693 return valueToString(value_.real_);
694 default:
695 JSON_FAIL_MESSAGE("Type is not convertible to string");
696 }
697 }
698
699 #ifdef JSON_USE_CPPTL
700 CppTL::ConstString Value::asConstString() const {
701 unsigned len;
702 char const* str;
703 decodePrefixedString(allocated_, value_.string_,
704 &len, &str);
705 return CppTL::ConstString(str, len);
706 }
707 #endif
708
709 Value::Int Value::asInt() const {
710 switch (type_) {
711 case intValue:
712 JSON_ASSERT_MESSAGE(isInt(), "LargestInt out of Int range");
713 return Int(value_.int_);
714 case uintValue:
715 JSON_ASSERT_MESSAGE(isInt(), "LargestUInt out of Int range");
716 return Int(value_.uint_);
717 case realValue:
718 JSON_ASSERT_MESSAGE(InRange(value_.real_, minInt, maxInt),
719 "double out of Int range");
720 return Int(value_.real_);
721 case nullValue:
722 return 0;
723 case booleanValue:
724 return value_.bool_ ? 1 : 0;
725 default:
726 break;
727 }
728 JSON_FAIL_MESSAGE("Value is not convertible to Int.");
729 }
730
731 Value::UInt Value::asUInt() const {
732 switch (type_) {
733 case intValue:
734 JSON_ASSERT_MESSAGE(isUInt(), "LargestInt out of UInt range");
735 return UInt(value_.int_);
736 case uintValue:
737 JSON_ASSERT_MESSAGE(isUInt(), "LargestUInt out of UInt range");
738 return UInt(value_.uint_);
739 case realValue:
740 JSON_ASSERT_MESSAGE(InRange(value_.real_, 0, maxUInt),
741 "double out of UInt range");
742 return UInt(value_.real_);
743 case nullValue:
744 return 0;
745 case booleanValue:
746 return value_.bool_ ? 1 : 0;
747 default:
748 break;
749 }
750 JSON_FAIL_MESSAGE("Value is not convertible to UInt.");
751 }
752
753 #if defined(JSON_HAS_INT64)
754
755 Value::Int64 Value::asInt64() const {
756 switch (type_) {
757 case intValue:
758 return Int64(value_.int_);
759 case uintValue:
760 JSON_ASSERT_MESSAGE(isInt64(), "LargestUInt out of Int64 range");
761 return Int64(value_.uint_);
762 case realValue:
763 JSON_ASSERT_MESSAGE(InRange(value_.real_, minInt64, maxInt64),
764 "double out of Int64 range");
765 return Int64(value_.real_);
766 case nullValue:
767 return 0;
768 case booleanValue:
769 return value_.bool_ ? 1 : 0;
770 default:
771 break;
772 }
773 JSON_FAIL_MESSAGE("Value is not convertible to Int64.");
774 }
775
776 Value::UInt64 Value::asUInt64() const {
777 switch (type_) {
778 case intValue:
779 JSON_ASSERT_MESSAGE(isUInt64(), "LargestInt out of UInt64 range");
780 return UInt64(value_.int_);
781 case uintValue:
782 return UInt64(value_.uint_);
783 case realValue:
784 JSON_ASSERT_MESSAGE(InRange(value_.real_, 0, maxUInt64),
785 "double out of UInt64 range");
786 return UInt64(value_.real_);
787 case nullValue:
788 return 0;
789 case booleanValue:
790 return value_.bool_ ? 1 : 0;
791 default:
792 break;
793 }
794 JSON_FAIL_MESSAGE("Value is not convertible to UInt64.");
795 }
796 #endif // if defined(JSON_HAS_INT64)
797
798 LargestInt Value::asLargestInt() const {
799 #if defined(JSON_NO_INT64)
800 return asInt();
801 #else
802 return asInt64();
803 #endif
804 }
805
806 LargestUInt Value::asLargestUInt() const {
807 #if defined(JSON_NO_INT64)
808 return asUInt();
809 #else
810 return asUInt64();
811 #endif
812 }
813
814 double Value::asDouble() const {
815 switch (type_) {
816 case intValue:
817 return static_cast<double>(value_.int_);
818 case uintValue:
819 #if !defined(JSON_USE_INT64_DOUBLE_CONVERSION)
820 return static_cast<double>(value_.uint_);
821 #else // if !defined(JSON_USE_INT64_DOUBLE_CONVERSION)
822 return integerToDouble(value_.uint_);
823 #endif // if !defined(JSON_USE_INT64_DOUBLE_CONVERSION)
824 case realValue:
825 return value_.real_;
826 case nullValue:
827 return 0.0;
828 case booleanValue:
829 return value_.bool_ ? 1.0 : 0.0;
830 default:
831 break;
832 }
833 JSON_FAIL_MESSAGE("Value is not convertible to double.");
834 }
835
836 float Value::asFloat() const {
837 switch (type_) {
838 case intValue:
839 return static_cast<float>(value_.int_);
840 case uintValue:
841 #if !defined(JSON_USE_INT64_DOUBLE_CONVERSION)
842 return static_cast<float>(value_.uint_);
843 #else // if !defined(JSON_USE_INT64_DOUBLE_CONVERSION)
844 // This can fail (silently?) if the value is bigger than MAX_FLOAT.
845 return static_cast<float>(integerToDouble(value_.uint_));
846 #endif // if !defined(JSON_USE_INT64_DOUBLE_CONVERSION)
847 case realValue:
848 return static_cast<float>(value_.real_);
849 case nullValue:
850 return 0.0;
851 case booleanValue:
852 return value_.bool_ ? 1.0f : 0.0f;
853 default:
854 break;
855 }
856 JSON_FAIL_MESSAGE("Value is not convertible to float.");
857 }
858
859 bool Value::asBool() const {
860 switch (type_) {
861 case booleanValue:
862 return value_.bool_;
863 case nullValue:
864 return false;
865 case intValue:
866 return value_.int_ ? true : false;
867 case uintValue:
868 return value_.uint_ ? true : false;
869 case realValue:
870 // This is kind of strange. Not recommended.
871 return (value_.real_ != 0.0) ? true : false;
872 default:
873 break;
874 }
875 JSON_FAIL_MESSAGE("Value is not convertible to bool.");
876 }
877
878 bool Value::isConvertibleTo(ValueType other) const {
879 switch (other) {
880 case nullValue:
881 return (isNumeric() && asDouble() == 0.0) ||
882 (type_ == booleanValue && value_.bool_ == false) ||
883 (type_ == stringValue && asString().empty()) ||
884 (type_ == arrayValue && value_.map_->size() == 0) ||
885 (type_ == objectValue && value_.map_->size() == 0) ||
886 type_ == nullValue;
887 case intValue:
888 return isInt() ||
889 (type_ == realValue && InRange(value_.real_, minInt, maxInt)) ||
890 type_ == booleanValue || type_ == nullValue;
891 case uintValue:
892 return isUInt() ||
893 (type_ == realValue && InRange(value_.real_, 0, maxUInt)) ||
894 type_ == booleanValue || type_ == nullValue;
895 case realValue:
896 return isNumeric() || type_ == booleanValue || type_ == nullValue;
897 case booleanValue:
898 return isNumeric() || type_ == booleanValue || type_ == nullValue;
899 case stringValue:
900 return isNumeric() || type_ == booleanValue || type_ == stringValue ||
901 type_ == nullValue;
902 case arrayValue:
903 return type_ == arrayValue || type_ == nullValue;
904 case objectValue:
905 return type_ == objectValue || type_ == nullValue;
906 }
907 JSON_ASSERT_UNREACHABLE;
908 return false;
909 }
910
912 ArrayIndex Value::size() const {
913 switch (type_) {
914 case nullValue:
915 case intValue:
916 case uintValue:
917 case realValue:
918 case booleanValue:
919 case stringValue:
920 return 0;
921 case arrayValue: // size of the array is highest index + 1
922 if (!value_.map_->empty()) {
923 ObjectValues::const_iterator itLast = value_.map_->end();
924 --itLast;
925 return (*itLast).first.index() + 1;
926 }
927 return 0;
928 case objectValue:
929 return ArrayIndex(value_.map_->size());
930 }
931 JSON_ASSERT_UNREACHABLE;
932 return 0; // unreachable;
933 }
934
935 bool Value::empty() const {
936 if (isNull() || isArray() || isObject())
937 return size() == 0u;
938 else
939 return false;
940 }
941
942 bool Value::operator!() const { return isNull(); }
943
944 void Value::clear() {
945 JSON_ASSERT_MESSAGE(type_ == nullValue || type_ == arrayValue ||
946 type_ == objectValue,
947 "in Json::Value::clear(): requires complex value");
948 start_ = 0;
949 limit_ = 0;
950 switch (type_) {
951 case arrayValue:
952 case objectValue:
953 value_.map_->clear();
954 break;
955 default:
956 break;
957 }
958 }
959
960 void Value::resize(ArrayIndex newSize) {
961 JSON_ASSERT_MESSAGE(type_ == nullValue || type_ == arrayValue,
962 "in Json::Value::resize(): requires arrayValue");
963 if (type_ == nullValue)
964 *this = Value(arrayValue);
965 ArrayIndex oldSize = size();
966 if (newSize == 0)
967 clear();
968 else if (newSize > oldSize)
969 (*this)[newSize - 1];
970 else {
971 for (ArrayIndex index = newSize; index < oldSize; ++index) {
972 value_.map_->erase(index);
973 }
974 JSON_ASSERT(size() == newSize);
975 }
976 }
977
978 Value& Value::operator[](ArrayIndex index) {
979 JSON_ASSERT_MESSAGE(
980 type_ == nullValue || type_ == arrayValue,
981 "in Json::Value::operator[](ArrayIndex): requires arrayValue");
982 if (type_ == nullValue)
983 *this = Value(arrayValue);
984 CZString key(index);
985 ObjectValues::iterator it = value_.map_->lower_bound(key);
986 if (it != value_.map_->end() && (*it).first == key)
987 return (*it).second;
988
989 ObjectValues::value_type defaultValue(key, nullSingleton());
990 it = value_.map_->insert(it, defaultValue);
991 return (*it).second;
992 }
993
994 Value& Value::operator[](int index) {
995 JSON_ASSERT_MESSAGE(
996 index >= 0,
997 "in Json::Value::operator[](int index): index cannot be negative");
998 return (*this)[ArrayIndex(index)];
999 }
1000
1001 const Value& Value::operator[](ArrayIndex index) const {
1002 JSON_ASSERT_MESSAGE(
1003 type_ == nullValue || type_ == arrayValue,
1004 "in Json::Value::operator[](ArrayIndex)const: requires arrayValue");
1005 if (type_ == nullValue)
1006 return nullSingleton();
1007 CZString key(index);
1008 ObjectValues::const_iterator it = value_.map_->find(key);
1009 if (it == value_.map_->end())
1010 return nullSingleton();
1011 return (*it).second;
1012 }
1013
1014 const Value& Value::operator[](int index) const {
1015 JSON_ASSERT_MESSAGE(
1016 index >= 0,
1017 "in Json::Value::operator[](int index) const: index cannot be negative");
1018 return (*this)[ArrayIndex(index)];
1019 }
1020
1021 void Value::initBasic(ValueType vtype, bool allocated) {
1022 type_ = vtype;
1023 allocated_ = allocated;
1024 comments_ = 0;
1025 start_ = 0;
1026 limit_ = 0;
1027 }
1028
1029 // Access an object value by name, create a null member if it does not exist.
1030 // @pre Type of '*this' is object or null.
1031 // @param key is null-terminated.
1032 Value& Value::resolveReference(const char* key) {
1033 JSON_ASSERT_MESSAGE(
1034 type_ == nullValue || type_ == objectValue,
1035 "in Json::Value::resolveReference(): requires objectValue");
1036 if (type_ == nullValue)
1037 *this = Value(objectValue);
1038 CZString actualKey(
1039 key, static_cast<unsigned>(strlen(key)), CZString::noDuplication); // NOTE!
1040 ObjectValues::iterator it = value_.map_->lower_bound(actualKey);
1041 if (it != value_.map_->end() && (*it).first == actualKey)
1042 return (*it).second;
1043
1044 ObjectValues::value_type defaultValue(actualKey, nullSingleton());
1045 it = value_.map_->insert(it, defaultValue);
1046 Value& value = (*it).second;
1047 return value;
1048 }
1049
1050 // @param key is not null-terminated.
1051 Value& Value::resolveReference(char const* key, char const* cend)
1052 {
1053 JSON_ASSERT_MESSAGE(
1054 type_ == nullValue || type_ == objectValue,
1055 "in Json::Value::resolveReference(key, end): requires objectValue");
1056 if (type_ == nullValue)
1057 *this = Value(objectValue);
1058 CZString actualKey(
1059 key, static_cast<unsigned>(cend-key), CZString::duplicateOnCopy);
1060 ObjectValues::iterator it = value_.map_->lower_bound(actualKey);
1061 if (it != value_.map_->end() && (*it).first == actualKey)
1062 return (*it).second;
1063
1064 ObjectValues::value_type defaultValue(actualKey, nullSingleton());
1065 it = value_.map_->insert(it, defaultValue);
1066 Value& value = (*it).second;
1067 return value;
1068 }
1069
1070 Value Value::get(ArrayIndex index, const Value& defaultValue) const {
1071 const Value* value = &((*this)[index]);
1072 return value == &nullSingleton() ? defaultValue : *value;
1073 }
1074
1075 bool Value::isValidIndex(ArrayIndex index) const { return index < size(); }
1076
1077 Value const* Value::find(char const* key, char const* cend) const
1078 {
1079 JSON_ASSERT_MESSAGE(
1080 type_ == nullValue || type_ == objectValue,
1081 "in Json::Value::find(key, end, found): requires objectValue or nullValue");
1082 if (type_ == nullValue) return NULL;
1083 CZString actualKey(key, static_cast<unsigned>(cend-key), CZString::noDuplication);
1084 ObjectValues::const_iterator it = value_.map_->find(actualKey);
1085 if (it == value_.map_->end()) return NULL;
1086 return &(*it).second;
1087 }
1088 const Value& Value::operator[](const char* key) const
1089 {
1090 Value const* found = find(key, key + strlen(key));
1091 if (!found) return nullSingleton();
1092 return *found;
1093 }
1094 Value const& Value::operator[](JSONCPP_STRING const& key) const
1095 {
1096 Value const* found = find(key.data(), key.data() + key.length());
1097 if (!found) return nullSingleton();
1098 return *found;
1099 }
1100
1101 Value& Value::operator[](const char* key) {
1102 return resolveReference(key, key + strlen(key));
1103 }
1104
1105 Value& Value::operator[](const JSONCPP_STRING& key) {
1106 return resolveReference(key.data(), key.data() + key.length());
1107 }
1108
1109 Value& Value::operator[](const StaticString& key) {
1110 return resolveReference(key.c_str());
1111 }
1112
1113 #ifdef JSON_USE_CPPTL
1114 Value& Value::operator[](const CppTL::ConstString& key) {
1115 return resolveReference(key.c_str(), key.end_c_str());
1116 }
1117 Value const& Value::operator[](CppTL::ConstString const& key) const
1118 {
1119 Value const* found = find(key.c_str(), key.end_c_str());
1120 if (!found) return nullSingleton();
1121 return *found;
1122 }
1123 #endif
1124
1125 Value& Value::append(const Value& value) { return (*this)[size()] = value; }
1126
1127 Value Value::get(char const* key, char const* cend, Value const& defaultValue) const
1128 {
1129 Value const* found = find(key, cend);
1130 return !found ? defaultValue : *found;
1131 }
1132 Value Value::get(char const* key, Value const& defaultValue) const
1133 {
1134 return get(key, key + strlen(key), defaultValue);
1135 }
1136 Value Value::get(JSONCPP_STRING const& key, Value const& defaultValue) const
1137 {
1138 return get(key.data(), key.data() + key.length(), defaultValue);
1139 }
1140
1141
1142 bool Value::removeMember(const char* key, const char* cend, Value* removed)
1143 {
1144 if (type_ != objectValue) {
1145 return false;
1146 }
1147 CZString actualKey(key, static_cast<unsigned>(cend-key), CZString::noDuplication);
1148 ObjectValues::iterator it = value_.map_->find(actualKey);
1149 if (it == value_.map_->end())
1150 return false;
1151 *removed = it->second;
1152 value_.map_->erase(it);
1153 return true;
1154 }
1155 bool Value::removeMember(const char* key, Value* removed)
1156 {
1157 return removeMember(key, key + strlen(key), removed);
1158 }
1159 bool Value::removeMember(JSONCPP_STRING const& key, Value* removed)
1160 {
1161 return removeMember(key.data(), key.data() + key.length(), removed);
1162 }
1163 Value Value::removeMember(const char* key)
1164 {
1165 JSON_ASSERT_MESSAGE(type_ == nullValue || type_ == objectValue,
1166 "in Json::Value::removeMember(): requires objectValue");
1167 if (type_ == nullValue)
1168 return nullSingleton();
1169
1170 Value removed; // null
1171 removeMember(key, key + strlen(key), &removed);
1172 return removed; // still null if removeMember() did nothing
1173 }
1174 Value Value::removeMember(const JSONCPP_STRING& key)
1175 {
1176 return removeMember(key.c_str());
1177 }
1178
1179 bool Value::removeIndex(ArrayIndex index, Value* removed) {
1180 if (type_ != arrayValue) {
1181 return false;
1182 }
1183 CZString key(index);
1184 ObjectValues::iterator it = value_.map_->find(key);
1185 if (it == value_.map_->end()) {
1186 return false;
1187 }
1188 *removed = it->second;
1189 ArrayIndex oldSize = size();
1190 // shift left all items left, into the place of the "removed"
1191 for (ArrayIndex i = index; i < (oldSize - 1); ++i){
1192 CZString keey(i);
1193 (*value_.map_)[keey] = (*this)[i + 1];
1194 }
1195 // erase the last one ("leftover")
1196 CZString keyLast(oldSize - 1);
1197 ObjectValues::iterator itLast = value_.map_->find(keyLast);
1198 value_.map_->erase(itLast);
1199 return true;
1200 }
1201
1202 #ifdef JSON_USE_CPPTL
1203 Value Value::get(const CppTL::ConstString& key,
1204 const Value& defaultValue) const {
1205 return get(key.c_str(), key.end_c_str(), defaultValue);
1206 }
1207 #endif
1208
1209 bool Value::isMember(char const* key, char const* cend) const
1210 {
1211 Value const* value = find(key, cend);
1212 return NULL != value;
1213 }
1214 bool Value::isMember(char const* key) const
1215 {
1216 return isMember(key, key + strlen(key));
1217 }
1218 bool Value::isMember(JSONCPP_STRING const& key) const
1219 {
1220 return isMember(key.data(), key.data() + key.length());
1221 }
1222
1223 #ifdef JSON_USE_CPPTL
1224 bool Value::isMember(const CppTL::ConstString& key) const {
1225 return isMember(key.c_str(), key.end_c_str());
1226 }
1227 #endif
1228
1229 Value::Members Value::getMemberNames() const {
1230 JSON_ASSERT_MESSAGE(
1231 type_ == nullValue || type_ == objectValue,
1232 "in Json::Value::getMemberNames(), value must be objectValue");
1233 if (type_ == nullValue)
1234 return Value::Members();
1235 Members members;
1236 members.reserve(value_.map_->size());
1237 ObjectValues::const_iterator it = value_.map_->begin();
1238 ObjectValues::const_iterator itEnd = value_.map_->end();
1239 for (; it != itEnd; ++it) {
1240 members.push_back(JSONCPP_STRING((*it).first.data(),
1241 (*it).first.length()));
1242 }
1243 return members;
1244 }
1245 //
1246 //# ifdef JSON_USE_CPPTL
1247 // EnumMemberNames
1248 // Value::enumMemberNames() const
1249 //{
1250 // if ( type_ == objectValue )
1251 // {
1252 // return CppTL::Enum::any( CppTL::Enum::transform(
1253 // CppTL::Enum::keys( *(value_.map_), CppTL::Type<const CZString &>() ),
1254 // MemberNamesTransform() ) );
1255 // }
1256 // return EnumMemberNames();
1257 //}
1258 //
1259 //
1260 // EnumValues
1261 // Value::enumValues() const
1262 //{
1263 // if ( type_ == objectValue || type_ == arrayValue )
1264 // return CppTL::Enum::anyValues( *(value_.map_),
1265 // CppTL::Type<const Value &>() );
1266 // return EnumValues();
1267 //}
1268 //
1269 //# endif
1270
1271 static bool IsIntegral(double d) {
1272 double integral_part;
1273 return modf(d, &integral_part) == 0.0;
1274 }
1275
1276 bool Value::isNull() const { return type_ == nullValue; }
1277
1278 bool Value::isBool() const { return type_ == booleanValue; }
1279
1280 bool Value::isInt() const {
1281 switch (type_) {
1282 case intValue:
1283 #if defined(JSON_HAS_INT64)
1284 return value_.int_ >= minInt && value_.int_ <= maxInt;
1285 #else
1286 return true;
1287 #endif
1288 case uintValue:
1289 return value_.uint_ <= UInt(maxInt);
1290 case realValue:
1291 return value_.real_ >= minInt && value_.real_ <= maxInt &&
1292 IsIntegral(value_.real_);
1293 default:
1294 break;
1295 }
1296 return false;
1297 }
1298
1299 bool Value::isUInt() const {
1300 switch (type_) {
1301 case intValue:
1302 #if defined(JSON_HAS_INT64)
1303 return value_.int_ >= 0 && LargestUInt(value_.int_) <= LargestUInt(maxUInt);
1304 #else
1305 return value_.int_ >= 0;
1306 #endif
1307 case uintValue:
1308 #if defined(JSON_HAS_INT64)
1309 return value_.uint_ <= maxUInt;
1310 #else
1311 return true;
1312 #endif
1313 case realValue:
1314 return value_.real_ >= 0 && value_.real_ <= maxUInt &&
1315 IsIntegral(value_.real_);
1316 default:
1317 break;
1318 }
1319 return false;
1320 }
1321
1322 bool Value::isInt64() const {
1323 #if defined(JSON_HAS_INT64)
1324 switch (type_) {
1325 case intValue:
1326 return true;
1327 case uintValue:
1328 return value_.uint_ <= UInt64(maxInt64);
1329 case realValue:
1330 // Note that maxInt64 (= 2^63 - 1) is not exactly representable as a
1331 // double, so double(maxInt64) will be rounded up to 2^63. Therefore we
1332 // require the value to be strictly less than the limit.
1333 return value_.real_ >= double(minInt64) &&
1334 value_.real_ < double(maxInt64) && IsIntegral(value_.real_);
1335 default:
1336 break;
1337 }
1338 #endif // JSON_HAS_INT64
1339 return false;
1340 }
1341
1342 bool Value::isUInt64() const {
1343 #if defined(JSON_HAS_INT64)
1344 switch (type_) {
1345 case intValue:
1346 return value_.int_ >= 0;
1347 case uintValue:
1348 return true;
1349 case realValue:
1350 // Note that maxUInt64 (= 2^64 - 1) is not exactly representable as a
1351 // double, so double(maxUInt64) will be rounded up to 2^64. Therefore we
1352 // require the value to be strictly less than the limit.
1353 return value_.real_ >= 0 && value_.real_ < maxUInt64AsDouble &&
1354 IsIntegral(value_.real_);
1355 default:
1356 break;
1357 }
1358 #endif // JSON_HAS_INT64
1359 return false;
1360 }
1361
1362 bool Value::isIntegral() const {
1363 switch (type_) {
1364 case intValue:
1365 case uintValue:
1366 return true;
1367 case realValue:
1368 #if defined(JSON_HAS_INT64)
1369 // Note that maxUInt64 (= 2^64 - 1) is not exactly representable as a
1370 // double, so double(maxUInt64) will be rounded up to 2^64. Therefore we
1371 // require the value to be strictly less than the limit.
1372 return value_.real_ >= double(minInt64) && value_.real_ < maxUInt64AsDouble && IsIntegral(value_.real_);
1373 #else
1374 return value_.real_ >= minInt && value_.real_ <= maxUInt && IsIntegral(value_.real_);
1375 #endif // JSON_HAS_INT64
1376 default:
1377 break;
1378 }
1379 return false;
1380 }
1381
1382 bool Value::isDouble() const { return type_ == intValue || type_ == uintValue || type_ == realValue; }
1383
1384 bool Value::isNumeric() const { return isDouble(); }
1385
1386 bool Value::isString() const { return type_ == stringValue; }
1387
1388 bool Value::isArray() const { return type_ == arrayValue; }
1389
1390 bool Value::isObject() const { return type_ == objectValue; }
1391
1392 void Value::setComment(const char* comment, size_t len, CommentPlacement placement) {
1393 if (!comments_)
1394 comments_ = new CommentInfo[numberOfCommentPlacement];
1395 if ((len > 0) && (comment[len-1] == '\n')) {
1396 // Always discard trailing newline, to aid indentation.
1397 len -= 1;
1398 }
1399 comments_[placement].setComment(comment, len);
1400 }
1401
1402 void Value::setComment(const char* comment, CommentPlacement placement) {
1403 setComment(comment, strlen(comment), placement);
1404 }
1405
1406 void Value::setComment(const JSONCPP_STRING& comment, CommentPlacement placement) {
1407 setComment(comment.c_str(), comment.length(), placement);
1408 }
1409
1410 bool Value::hasComment(CommentPlacement placement) const {
1411 return comments_ != 0 && comments_[placement].comment_ != 0;
1412 }
1413
1414 JSONCPP_STRING Value::getComment(CommentPlacement placement) const {
1415 if (hasComment(placement))
1416 return comments_[placement].comment_;
1417 return "";
1418 }
1419
1420 void Value::setOffsetStart(ptrdiff_t start) { start_ = start; }
1421
1422 void Value::setOffsetLimit(ptrdiff_t limit) { limit_ = limit; }
1423
1424 ptrdiff_t Value::getOffsetStart() const { return start_; }
1425
1426 ptrdiff_t Value::getOffsetLimit() const { return limit_; }
1427
1428 JSONCPP_STRING Value::toStyledString() const {
1429 StyledWriter writer;
1430 return writer.write(*this);
1431 }
1432
1433 Value::const_iterator Value::begin() const {
1434 switch (type_) {
1435 case arrayValue:
1436 case objectValue:
1437 if (value_.map_)
1438 return const_iterator(value_.map_->begin());
1439 break;
1440 default:
1441 break;
1442 }
1443 return const_iterator();
1444 }
1445
1446 Value::const_iterator Value::end() const {
1447 switch (type_) {
1448 case arrayValue:
1449 case objectValue:
1450 if (value_.map_)
1451 return const_iterator(value_.map_->end());
1452 break;
1453 default:
1454 break;
1455 }
1456 return const_iterator();
1457 }
1458
1459 Value::iterator Value::begin() {
1460 switch (type_) {
1461 case arrayValue:
1462 case objectValue:
1463 if (value_.map_)
1464 return iterator(value_.map_->begin());
1465 break;
1466 default:
1467 break;
1468 }
1469 return iterator();
1470 }
1471
1472 Value::iterator Value::end() {
1473 switch (type_) {
1474 case arrayValue:
1475 case objectValue:
1476 if (value_.map_)
1477 return iterator(value_.map_->end());
1478 break;
1479 default:
1480 break;
1481 }
1482 return iterator();
1483 }
1484
1485 // class PathArgument
1486 // //////////////////////////////////////////////////////////////////
1487
1488 PathArgument::PathArgument() : key_(), index_(), kind_(kindNone) {}
1489
1490 PathArgument::PathArgument(ArrayIndex index)
1491 : key_(), index_(index), kind_(kindIndex) {}
1492
1493 PathArgument::PathArgument(const char* key)
1494 : key_(key), index_(), kind_(kindKey) {}
1495
1496 PathArgument::PathArgument(const JSONCPP_STRING& key)
1497 : key_(key.c_str()), index_(), kind_(kindKey) {}
1498
1499 // class Path
1500 // //////////////////////////////////////////////////////////////////
1501
1502 Path::Path(const JSONCPP_STRING& path,
1503 const PathArgument& a1,
1504 const PathArgument& a2,
1505 const PathArgument& a3,
1506 const PathArgument& a4,
1507 const PathArgument& a5) {
1508 InArgs in;
1509 in.reserve(5);
1510 in.push_back(&a1);
1511 in.push_back(&a2);
1512 in.push_back(&a3);
1513 in.push_back(&a4);
1514 in.push_back(&a5);
1515 makePath(path, in);
1516 }
1517
1518 void Path::makePath(const JSONCPP_STRING& path, const InArgs& in) {
1519 const char* current = path.c_str();
1520 const char* end = current + path.length();
1521 InArgs::const_iterator itInArg = in.begin();
1522 while (current != end) {
1523 if (*current == '[') {
1524 ++current;
1525 if (*current == '%')
1526 addPathInArg(path, in, itInArg, PathArgument::kindIndex);
1527 else {
1528 ArrayIndex index = 0;
1529 for (; current != end && *current >= '0' && *current <= '9'; ++current)
1530 index = index * 10 + ArrayIndex(*current - '0');
1531 args_.push_back(index);
1532 }
1533 if (current == end || *++current != ']')
1534 invalidPath(path, int(current - path.c_str()));
1535 } else if (*current == '%') {
1536 addPathInArg(path, in, itInArg, PathArgument::kindKey);
1537 ++current;
1538 } else if (*current == '.' || *current == ']') {
1539 ++current;
1540 } else {
1541 const char* beginName = current;
1542 while (current != end && !strchr("[.", *current))
1543 ++current;
1544 args_.push_back(JSONCPP_STRING(beginName, current));
1545 }
1546 }
1547 }
1548
1549 void Path::addPathInArg(const JSONCPP_STRING& /*path*/,
1550 const InArgs& in,
1551 InArgs::const_iterator& itInArg,
1552 PathArgument::Kind kind) {
1553 if (itInArg == in.end()) {
1554 // Error: missing argument %d
1555 } else if ((*itInArg)->kind_ != kind) {
1556 // Error: bad argument type
1557 } else {
1558 args_.push_back(**itInArg++);
1559 }
1560 }
1561
1562 void Path::invalidPath(const JSONCPP_STRING& /*path*/, int /*location*/) {
1563 // Error: invalid path.
1564 }
1565
1566 const Value& Path::resolve(const Value& root) const {
1567 const Value* node = &root;
1568 for (Args::const_iterator it = args_.begin(); it != args_.end(); ++it) {
1569 const PathArgument& arg = *it;
1570 if (arg.kind_ == PathArgument::kindIndex) {
1571 if (!node->isArray() || !node->isValidIndex(arg.index_)) {
1572 // Error: unable to resolve path (array value expected at position...
1573 return Value::null;
1574 }
1575 node = &((*node)[arg.index_]);
1576 } else if (arg.kind_ == PathArgument::kindKey) {
1577 if (!node->isObject()) {
1578 // Error: unable to resolve path (object value expected at position...)
1579 return Value::null;
1580 }
1581 node = &((*node)[arg.key_]);
1582 if (node == &Value::nullSingleton()) {
1583 // Error: unable to resolve path (object has no member named '' at
1584 // position...)
1585 return Value::null;
1586 }
1587 }
1588 }
1589 return *node;
1590 }
1591
1592 Value Path::resolve(const Value& root, const Value& defaultValue) const {
1593 const Value* node = &root;
1594 for (Args::const_iterator it = args_.begin(); it != args_.end(); ++it) {
1595 const PathArgument& arg = *it;
1596 if (arg.kind_ == PathArgument::kindIndex) {
1597 if (!node->isArray() || !node->isValidIndex(arg.index_))
1598 return defaultValue;
1599 node = &((*node)[arg.index_]);
1600 } else if (arg.kind_ == PathArgument::kindKey) {
1601 if (!node->isObject())
1602 return defaultValue;
1603 node = &((*node)[arg.key_]);
1604 if (node == &Value::nullSingleton())
1605 return defaultValue;
1606 }
1607 }
1608 return *node;
1609 }
1610
1611 Value& Path::make(Value& root) const {
1612 Value* node = &root;
1613 for (Args::const_iterator it = args_.begin(); it != args_.end(); ++it) {
1614 const PathArgument& arg = *it;
1615 if (arg.kind_ == PathArgument::kindIndex) {
1616 if (!node->isArray()) {
1617 // Error: node is not an array at position ...
1618 }
1619 node = &((*node)[arg.index_]);
1620 } else if (arg.kind_ == PathArgument::kindKey) {
1621 if (!node->isObject()) {
1622 // Error: node is not an object at position...
1623 }
1624 node = &((*node)[arg.key_]);
1625 }
1626 }
1627 return *node;
1628 }
1629
1630 } // namespace Json
Json::Path::Path
Path(const std::string &path, const PathArgument &a1=PathArgument(), const PathArgument &a2=PathArgument(), const PathArgument &a3=PathArgument(), const PathArgument &a4=PathArgument(), const PathArgument &a5=PathArgument())
Definition: json_value.cpp:1502
Json::LargestInt
Int64 LargestInt
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Json::Value::asInt64
Int64 asInt64() const
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Json::StyledWriter
Writes a Value in JSON format in a human friendly way.
Definition: writer.h:212
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bool isArray() const
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Maximum signed 64 bits int value that can be stored in a Json::Value.
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Json::ArrayIndex
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Json::Path::make
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Creates the "path" to access the specified node and returns a reference on the node.
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unsigned __int64 UInt64
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bool isNumeric() const
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bool asBool() const
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static Value const & nullSingleton()
Prefer this to null or nullRef.
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Json::uintValue
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#define JSONCPP_STRING
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Json::objectValue
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It should not be possible for a maliciously designed file to cause an abort() or seg-fault, so these macros are used only for pre-condition violations and internal logic errors.
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static const UInt maxUInt
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just a kludge for binary-compatibility; same as null
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Json::LargestUInt LargestUInt
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