mirror of
https://github.com/monero-project/monero.git
synced 2024-12-10 14:04:21 -05:00
390 lines
14 KiB
C++
390 lines
14 KiB
C++
// Copyright (C) 2011 Milo Yip
|
|
//
|
|
// Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
// of this software and associated documentation files (the "Software"), to deal
|
|
// in the Software without restriction, including without limitation the rights
|
|
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
// copies of the Software, and to permit persons to whom the Software is
|
|
// furnished to do so, subject to the following conditions:
|
|
//
|
|
// The above copyright notice and this permission notice shall be included in
|
|
// all copies or substantial portions of the Software.
|
|
//
|
|
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
|
// THE SOFTWARE.
|
|
|
|
#ifndef RAPIDJSON_WRITER_H_
|
|
#define RAPIDJSON_WRITER_H_
|
|
|
|
#include "rapidjson.h"
|
|
#include "internal/stack.h"
|
|
#include "internal/strfunc.h"
|
|
#include "internal/dtoa.h"
|
|
#include "internal/itoa.h"
|
|
#include "stringbuffer.h"
|
|
#include <new> // placement new
|
|
|
|
#ifdef _MSC_VER
|
|
RAPIDJSON_DIAG_PUSH
|
|
RAPIDJSON_DIAG_OFF(4127) // conditional expression is constant
|
|
#endif
|
|
|
|
namespace rapidjson {
|
|
|
|
//! JSON writer
|
|
/*! Writer implements the concept Handler.
|
|
It generates JSON text by events to an output os.
|
|
|
|
User may programmatically calls the functions of a writer to generate JSON text.
|
|
|
|
On the other side, a writer can also be passed to objects that generates events,
|
|
|
|
for example Reader::Parse() and Document::Accept().
|
|
|
|
\tparam OutputStream Type of output stream.
|
|
\tparam SourceEncoding Encoding of source string.
|
|
\tparam TargetEncoding Encoding of output stream.
|
|
\tparam StackAllocator Type of allocator for allocating memory of stack.
|
|
\note implements Handler concept
|
|
*/
|
|
template<typename OutputStream, typename SourceEncoding = UTF8<>, typename TargetEncoding = UTF8<>, typename StackAllocator = CrtAllocator>
|
|
class Writer {
|
|
public:
|
|
typedef typename SourceEncoding::Ch Ch;
|
|
|
|
//! Constructor
|
|
/*! \param os Output stream.
|
|
\param allocator User supplied allocator. If it is null, it will create a private one.
|
|
\param levelDepth Initial capacity of stack.
|
|
*/
|
|
Writer(OutputStream& os, StackAllocator* stackAllocator = 0, size_t levelDepth = kDefaultLevelDepth) :
|
|
os_(&os), level_stack_(stackAllocator, levelDepth * sizeof(Level)), hasRoot_(false) {}
|
|
|
|
Writer(StackAllocator* allocator = 0, size_t levelDepth = kDefaultLevelDepth) :
|
|
os_(0), level_stack_(allocator, levelDepth * sizeof(Level)), hasRoot_(false) {}
|
|
|
|
//! Reset the writer with a new stream.
|
|
/*!
|
|
This function reset the writer with a new stream and default settings,
|
|
in order to make a Writer object reusable for output multiple JSONs.
|
|
|
|
\param os New output stream.
|
|
\code
|
|
Writer<OutputStream> writer(os1);
|
|
writer.StartObject();
|
|
// ...
|
|
writer.EndObject();
|
|
|
|
writer.Reset(os2);
|
|
writer.StartObject();
|
|
// ...
|
|
writer.EndObject();
|
|
\endcode
|
|
*/
|
|
void Reset(OutputStream& os) {
|
|
os_ = &os;
|
|
hasRoot_ = false;
|
|
level_stack_.Clear();
|
|
}
|
|
|
|
//! Checks whether the output is a complete JSON.
|
|
/*!
|
|
A complete JSON has a complete root object or array.
|
|
*/
|
|
bool IsComplete() const {
|
|
return hasRoot_ && level_stack_.Empty();
|
|
}
|
|
|
|
/*!@name Implementation of Handler
|
|
\see Handler
|
|
*/
|
|
//@{
|
|
|
|
bool Null() { Prefix(kNullType); return WriteNull(); }
|
|
bool Bool(bool b) { Prefix(b ? kTrueType : kFalseType); return WriteBool(b); }
|
|
bool Int(int i) { Prefix(kNumberType); return WriteInt(i); }
|
|
bool Uint(unsigned u) { Prefix(kNumberType); return WriteUint(u); }
|
|
bool Int64(int64_t i64) { Prefix(kNumberType); return WriteInt64(i64); }
|
|
bool Uint64(uint64_t u64) { Prefix(kNumberType); return WriteUint64(u64); }
|
|
|
|
//! Writes the given \c double value to the stream
|
|
/*!
|
|
\param d The value to be written.
|
|
\return Whether it is succeed.
|
|
*/
|
|
bool Double(double d) { Prefix(kNumberType); return WriteDouble(d); }
|
|
|
|
bool String(const Ch* str, SizeType length, bool copy = false) {
|
|
(void)copy;
|
|
Prefix(kStringType);
|
|
return WriteString(str, length);
|
|
}
|
|
|
|
bool StartObject() {
|
|
Prefix(kObjectType);
|
|
new (level_stack_.template Push<Level>()) Level(false);
|
|
return WriteStartObject();
|
|
}
|
|
|
|
bool Key(const Ch* str, SizeType length, bool copy = false) { return String(str, length, copy); }
|
|
|
|
bool EndObject(SizeType memberCount = 0) {
|
|
(void)memberCount;
|
|
RAPIDJSON_ASSERT(level_stack_.GetSize() >= sizeof(Level));
|
|
RAPIDJSON_ASSERT(!level_stack_.template Top<Level>()->inArray);
|
|
level_stack_.template Pop<Level>(1);
|
|
bool ret = WriteEndObject();
|
|
if (level_stack_.Empty()) // end of json text
|
|
os_->Flush();
|
|
return ret;
|
|
}
|
|
|
|
bool StartArray() {
|
|
Prefix(kArrayType);
|
|
new (level_stack_.template Push<Level>()) Level(true);
|
|
return WriteStartArray();
|
|
}
|
|
|
|
bool EndArray(SizeType elementCount = 0) {
|
|
(void)elementCount;
|
|
RAPIDJSON_ASSERT(level_stack_.GetSize() >= sizeof(Level));
|
|
RAPIDJSON_ASSERT(level_stack_.template Top<Level>()->inArray);
|
|
level_stack_.template Pop<Level>(1);
|
|
bool ret = WriteEndArray();
|
|
if (level_stack_.Empty()) // end of json text
|
|
os_->Flush();
|
|
return ret;
|
|
}
|
|
//@}
|
|
|
|
/*! @name Convenience extensions */
|
|
//@{
|
|
|
|
//! Simpler but slower overload.
|
|
bool String(const Ch* str) { return String(str, internal::StrLen(str)); }
|
|
bool Key(const Ch* str) { return Key(str, internal::StrLen(str)); }
|
|
|
|
//@}
|
|
|
|
protected:
|
|
//! Information for each nested level
|
|
struct Level {
|
|
Level(bool inArray_) : valueCount(0), inArray(inArray_) {}
|
|
size_t valueCount; //!< number of values in this level
|
|
bool inArray; //!< true if in array, otherwise in object
|
|
};
|
|
|
|
static const size_t kDefaultLevelDepth = 32;
|
|
|
|
bool WriteNull() {
|
|
os_->Put('n'); os_->Put('u'); os_->Put('l'); os_->Put('l'); return true;
|
|
}
|
|
|
|
bool WriteBool(bool b) {
|
|
if (b) {
|
|
os_->Put('t'); os_->Put('r'); os_->Put('u'); os_->Put('e');
|
|
}
|
|
else {
|
|
os_->Put('f'); os_->Put('a'); os_->Put('l'); os_->Put('s'); os_->Put('e');
|
|
}
|
|
return true;
|
|
}
|
|
|
|
bool WriteInt(int i) {
|
|
char buffer[11];
|
|
const char* end = internal::i32toa(i, buffer);
|
|
for (const char* p = buffer; p != end; ++p)
|
|
os_->Put(*p);
|
|
return true;
|
|
}
|
|
|
|
bool WriteUint(unsigned u) {
|
|
char buffer[10];
|
|
const char* end = internal::u32toa(u, buffer);
|
|
for (const char* p = buffer; p != end; ++p)
|
|
os_->Put(*p);
|
|
return true;
|
|
}
|
|
|
|
bool WriteInt64(int64_t i64) {
|
|
char buffer[21];
|
|
const char* end = internal::i64toa(i64, buffer);
|
|
for (const char* p = buffer; p != end; ++p)
|
|
os_->Put(*p);
|
|
return true;
|
|
}
|
|
|
|
bool WriteUint64(uint64_t u64) {
|
|
char buffer[20];
|
|
char* end = internal::u64toa(u64, buffer);
|
|
for (char* p = buffer; p != end; ++p)
|
|
os_->Put(*p);
|
|
return true;
|
|
}
|
|
|
|
bool WriteDouble(double d) {
|
|
char buffer[25];
|
|
char* end = internal::dtoa(d, buffer);
|
|
for (char* p = buffer; p != end; ++p)
|
|
os_->Put(*p);
|
|
return true;
|
|
}
|
|
|
|
bool WriteString(const Ch* str, SizeType length) {
|
|
static const char hexDigits[16] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' };
|
|
static const char escape[256] = {
|
|
#define Z16 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
|
|
//0 1 2 3 4 5 6 7 8 9 A B C D E F
|
|
'u', 'u', 'u', 'u', 'u', 'u', 'u', 'u', 'b', 't', 'n', 'u', 'f', 'r', 'u', 'u', // 00
|
|
'u', 'u', 'u', 'u', 'u', 'u', 'u', 'u', 'u', 'u', 'u', 'u', 'u', 'u', 'u', 'u', // 10
|
|
0, 0, '"', 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 20
|
|
Z16, Z16, // 30~4F
|
|
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,'\\', 0, 0, 0, // 50
|
|
Z16, Z16, Z16, Z16, Z16, Z16, Z16, Z16, Z16, Z16 // 60~FF
|
|
#undef Z16
|
|
};
|
|
|
|
os_->Put('\"');
|
|
GenericStringStream<SourceEncoding> is(str);
|
|
while (is.Tell() < length) {
|
|
const Ch c = is.Peek();
|
|
if (!TargetEncoding::supportUnicode && (unsigned)c >= 0x80) {
|
|
// Unicode escaping
|
|
unsigned codepoint;
|
|
if (!SourceEncoding::Decode(is, &codepoint))
|
|
return false;
|
|
os_->Put('\\');
|
|
os_->Put('u');
|
|
if (codepoint <= 0xD7FF || (codepoint >= 0xE000 && codepoint <= 0xFFFF)) {
|
|
os_->Put(hexDigits[(codepoint >> 12) & 15]);
|
|
os_->Put(hexDigits[(codepoint >> 8) & 15]);
|
|
os_->Put(hexDigits[(codepoint >> 4) & 15]);
|
|
os_->Put(hexDigits[(codepoint ) & 15]);
|
|
}
|
|
else if (codepoint >= 0x010000 && codepoint <= 0x10FFFF) {
|
|
// Surrogate pair
|
|
unsigned s = codepoint - 0x010000;
|
|
unsigned lead = (s >> 10) + 0xD800;
|
|
unsigned trail = (s & 0x3FF) + 0xDC00;
|
|
os_->Put(hexDigits[(lead >> 12) & 15]);
|
|
os_->Put(hexDigits[(lead >> 8) & 15]);
|
|
os_->Put(hexDigits[(lead >> 4) & 15]);
|
|
os_->Put(hexDigits[(lead ) & 15]);
|
|
os_->Put('\\');
|
|
os_->Put('u');
|
|
os_->Put(hexDigits[(trail >> 12) & 15]);
|
|
os_->Put(hexDigits[(trail >> 8) & 15]);
|
|
os_->Put(hexDigits[(trail >> 4) & 15]);
|
|
os_->Put(hexDigits[(trail ) & 15]);
|
|
}
|
|
else
|
|
return false; // invalid code point
|
|
}
|
|
else if ((sizeof(Ch) == 1 || (unsigned)c < 256) && escape[(unsigned char)c]) {
|
|
is.Take();
|
|
os_->Put('\\');
|
|
os_->Put(escape[(unsigned char)c]);
|
|
if (escape[(unsigned char)c] == 'u') {
|
|
os_->Put('0');
|
|
os_->Put('0');
|
|
os_->Put(hexDigits[(unsigned char)c >> 4]);
|
|
os_->Put(hexDigits[(unsigned char)c & 0xF]);
|
|
}
|
|
}
|
|
else
|
|
Transcoder<SourceEncoding, TargetEncoding>::Transcode(is, *os_);
|
|
}
|
|
os_->Put('\"');
|
|
return true;
|
|
}
|
|
|
|
bool WriteStartObject() { os_->Put('{'); return true; }
|
|
bool WriteEndObject() { os_->Put('}'); return true; }
|
|
bool WriteStartArray() { os_->Put('['); return true; }
|
|
bool WriteEndArray() { os_->Put(']'); return true; }
|
|
|
|
void Prefix(Type type) {
|
|
(void)type;
|
|
if (level_stack_.GetSize() != 0) { // this value is not at root
|
|
Level* level = level_stack_.template Top<Level>();
|
|
if (level->valueCount > 0) {
|
|
if (level->inArray)
|
|
os_->Put(','); // add comma if it is not the first element in array
|
|
else // in object
|
|
os_->Put((level->valueCount % 2 == 0) ? ',' : ':');
|
|
}
|
|
if (!level->inArray && level->valueCount % 2 == 0)
|
|
RAPIDJSON_ASSERT(type == kStringType); // if it's in object, then even number should be a name
|
|
level->valueCount++;
|
|
}
|
|
else {
|
|
RAPIDJSON_ASSERT(!hasRoot_); // Should only has one and only one root.
|
|
hasRoot_ = true;
|
|
}
|
|
}
|
|
|
|
OutputStream* os_;
|
|
internal::Stack<StackAllocator> level_stack_;
|
|
bool hasRoot_;
|
|
|
|
private:
|
|
// Prohibit copy constructor & assignment operator.
|
|
Writer(const Writer&);
|
|
Writer& operator=(const Writer&);
|
|
};
|
|
|
|
// Full specialization for StringStream to prevent memory copying
|
|
|
|
template<>
|
|
inline bool Writer<StringBuffer>::WriteInt(int i) {
|
|
char *buffer = os_->Push(11);
|
|
const char* end = internal::i32toa(i, buffer);
|
|
os_->Pop(11 - (end - buffer));
|
|
return true;
|
|
}
|
|
|
|
template<>
|
|
inline bool Writer<StringBuffer>::WriteUint(unsigned u) {
|
|
char *buffer = os_->Push(10);
|
|
const char* end = internal::u32toa(u, buffer);
|
|
os_->Pop(10 - (end - buffer));
|
|
return true;
|
|
}
|
|
|
|
template<>
|
|
inline bool Writer<StringBuffer>::WriteInt64(int64_t i64) {
|
|
char *buffer = os_->Push(21);
|
|
const char* end = internal::i64toa(i64, buffer);
|
|
os_->Pop(21 - (end - buffer));
|
|
return true;
|
|
}
|
|
|
|
template<>
|
|
inline bool Writer<StringBuffer>::WriteUint64(uint64_t u) {
|
|
char *buffer = os_->Push(20);
|
|
const char* end = internal::u64toa(u, buffer);
|
|
os_->Pop(20 - (end - buffer));
|
|
return true;
|
|
}
|
|
|
|
template<>
|
|
inline bool Writer<StringBuffer>::WriteDouble(double d) {
|
|
char *buffer = os_->Push(25);
|
|
char* end = internal::dtoa(d, buffer);
|
|
os_->Pop(25 - (end - buffer));
|
|
return true;
|
|
}
|
|
|
|
} // namespace rapidjson
|
|
|
|
#ifdef _MSC_VER
|
|
RAPIDJSON_DIAG_POP
|
|
#endif
|
|
|
|
#endif // RAPIDJSON_RAPIDJSON_H_
|