710 lines
26 KiB
C++
Executable File
710 lines
26 KiB
C++
Executable File
// Tencent is pleased to support the open source community by making RapidJSON available.
|
|
//
|
|
// Copyright (C) 2015 THL A29 Limited, a Tencent company, and Milo Yip. All rights reserved.
|
|
//
|
|
// Licensed under the MIT License (the "License"); you may not use this file except
|
|
// in compliance with the License. You may obtain a copy of the License at
|
|
//
|
|
// http://opensource.org/licenses/MIT
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software distributed
|
|
// under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
|
|
// CONDITIONS OF ANY KIND, either express or implied. See the License for the
|
|
// specific language governing permissions and limitations under the License.
|
|
|
|
#ifndef RAPIDJSON_WRITER_H_
|
|
#define RAPIDJSON_WRITER_H_
|
|
|
|
#include "stream.h"
|
|
#include "internal/meta.h"
|
|
#include "internal/stack.h"
|
|
#include "internal/strfunc.h"
|
|
#include "internal/dtoa.h"
|
|
#include "internal/itoa.h"
|
|
#include "stringbuffer.h"
|
|
#include <new> // placement new
|
|
|
|
#if defined(RAPIDJSON_SIMD) && defined(_MSC_VER)
|
|
#include <intrin.h>
|
|
#pragma intrinsic(_BitScanForward)
|
|
#endif
|
|
#ifdef RAPIDJSON_SSE42
|
|
#include <nmmintrin.h>
|
|
#elif defined(RAPIDJSON_SSE2)
|
|
#include <emmintrin.h>
|
|
#elif defined(RAPIDJSON_NEON)
|
|
#include <arm_neon.h>
|
|
#endif
|
|
|
|
#ifdef __clang__
|
|
RAPIDJSON_DIAG_PUSH
|
|
RAPIDJSON_DIAG_OFF(padded)
|
|
RAPIDJSON_DIAG_OFF(unreachable-code)
|
|
RAPIDJSON_DIAG_OFF(c++98-compat)
|
|
#elif defined(_MSC_VER)
|
|
RAPIDJSON_DIAG_PUSH
|
|
RAPIDJSON_DIAG_OFF(4127) // conditional expression is constant
|
|
#endif
|
|
|
|
RAPIDJSON_NAMESPACE_BEGIN
|
|
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
// WriteFlag
|
|
|
|
/*! \def RAPIDJSON_WRITE_DEFAULT_FLAGS
|
|
\ingroup RAPIDJSON_CONFIG
|
|
\brief User-defined kWriteDefaultFlags definition.
|
|
|
|
User can define this as any \c WriteFlag combinations.
|
|
*/
|
|
#ifndef RAPIDJSON_WRITE_DEFAULT_FLAGS
|
|
#define RAPIDJSON_WRITE_DEFAULT_FLAGS kWriteNoFlags
|
|
#endif
|
|
|
|
//! Combination of writeFlags
|
|
enum WriteFlag {
|
|
kWriteNoFlags = 0, //!< No flags are set.
|
|
kWriteValidateEncodingFlag = 1, //!< Validate encoding of JSON strings.
|
|
kWriteNanAndInfFlag = 2, //!< Allow writing of Infinity, -Infinity and NaN.
|
|
kWriteDefaultFlags = RAPIDJSON_WRITE_DEFAULT_FLAGS //!< Default write flags. Can be customized by defining RAPIDJSON_WRITE_DEFAULT_FLAGS
|
|
};
|
|
|
|
//! 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, unsigned writeFlags = kWriteDefaultFlags>
|
|
class Writer {
|
|
public:
|
|
typedef typename SourceEncoding::Ch Ch;
|
|
|
|
static const int kDefaultMaxDecimalPlaces = 324;
|
|
|
|
//! Constructor
|
|
/*! \param os Output stream.
|
|
\param stackAllocator User supplied allocator. If it is null, it will create a private one.
|
|
\param levelDepth Initial capacity of stack.
|
|
*/
|
|
explicit
|
|
Writer(OutputStream& os, StackAllocator* stackAllocator = 0, size_t levelDepth = kDefaultLevelDepth) :
|
|
os_(&os), level_stack_(stackAllocator, levelDepth * sizeof(Level)), maxDecimalPlaces_(kDefaultMaxDecimalPlaces), hasRoot_(false) {}
|
|
|
|
explicit
|
|
Writer(StackAllocator* allocator = 0, size_t levelDepth = kDefaultLevelDepth) :
|
|
os_(0), level_stack_(allocator, levelDepth * sizeof(Level)), maxDecimalPlaces_(kDefaultMaxDecimalPlaces), hasRoot_(false) {}
|
|
|
|
#if RAPIDJSON_HAS_CXX11_RVALUE_REFS
|
|
Writer(Writer&& rhs) :
|
|
os_(rhs.os_), level_stack_(std::move(rhs.level_stack_)), maxDecimalPlaces_(rhs.maxDecimalPlaces_), hasRoot_(rhs.hasRoot_) {
|
|
rhs.os_ = 0;
|
|
}
|
|
#endif
|
|
|
|
//! 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();
|
|
}
|
|
|
|
int GetMaxDecimalPlaces() const {
|
|
return maxDecimalPlaces_;
|
|
}
|
|
|
|
//! Sets the maximum number of decimal places for double output.
|
|
/*!
|
|
This setting truncates the output with specified number of decimal places.
|
|
|
|
For example,
|
|
|
|
\code
|
|
writer.SetMaxDecimalPlaces(3);
|
|
writer.StartArray();
|
|
writer.Double(0.12345); // "0.123"
|
|
writer.Double(0.0001); // "0.0"
|
|
writer.Double(1.234567890123456e30); // "1.234567890123456e30" (do not truncate significand for positive exponent)
|
|
writer.Double(1.23e-4); // "0.0" (do truncate significand for negative exponent)
|
|
writer.EndArray();
|
|
\endcode
|
|
|
|
The default setting does not truncate any decimal places. You can restore to this setting by calling
|
|
\code
|
|
writer.SetMaxDecimalPlaces(Writer::kDefaultMaxDecimalPlaces);
|
|
\endcode
|
|
*/
|
|
void SetMaxDecimalPlaces(int maxDecimalPlaces) {
|
|
maxDecimalPlaces_ = maxDecimalPlaces;
|
|
}
|
|
|
|
/*!@name Implementation of Handler
|
|
\see Handler
|
|
*/
|
|
//@{
|
|
|
|
bool Null() { Prefix(kNullType); return EndValue(WriteNull()); }
|
|
bool Bool(bool b) { Prefix(b ? kTrueType : kFalseType); return EndValue(WriteBool(b)); }
|
|
bool Int(int i) { Prefix(kNumberType); return EndValue(WriteInt(i)); }
|
|
bool Uint(unsigned u) { Prefix(kNumberType); return EndValue(WriteUint(u)); }
|
|
bool Int64(int64_t i64) { Prefix(kNumberType); return EndValue(WriteInt64(i64)); }
|
|
bool Uint64(uint64_t u64) { Prefix(kNumberType); return EndValue(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 EndValue(WriteDouble(d)); }
|
|
|
|
bool RawNumber(const Ch* str, SizeType length, bool copy = false) {
|
|
RAPIDJSON_ASSERT(str != 0);
|
|
(void)copy;
|
|
Prefix(kNumberType);
|
|
return EndValue(WriteString(str, length));
|
|
}
|
|
|
|
bool String(const Ch* str, SizeType length, bool copy = false) {
|
|
RAPIDJSON_ASSERT(str != 0);
|
|
(void)copy;
|
|
Prefix(kStringType);
|
|
return EndValue(WriteString(str, length));
|
|
}
|
|
|
|
#if RAPIDJSON_HAS_STDSTRING
|
|
bool String(const std::basic_string<Ch>& str) {
|
|
return String(str.data(), SizeType(str.size()));
|
|
}
|
|
#endif
|
|
|
|
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); }
|
|
|
|
#if RAPIDJSON_HAS_STDSTRING
|
|
bool Key(const std::basic_string<Ch>& str)
|
|
{
|
|
return Key(str.data(), SizeType(str.size()));
|
|
}
|
|
#endif
|
|
|
|
bool EndObject(SizeType memberCount = 0) {
|
|
(void)memberCount;
|
|
RAPIDJSON_ASSERT(level_stack_.GetSize() >= sizeof(Level)); // not inside an Object
|
|
RAPIDJSON_ASSERT(!level_stack_.template Top<Level>()->inArray); // currently inside an Array, not Object
|
|
RAPIDJSON_ASSERT(0 == level_stack_.template Top<Level>()->valueCount % 2); // Object has a Key without a Value
|
|
level_stack_.template Pop<Level>(1);
|
|
return EndValue(WriteEndObject());
|
|
}
|
|
|
|
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);
|
|
return EndValue(WriteEndArray());
|
|
}
|
|
//@}
|
|
|
|
/*! @name Convenience extensions */
|
|
//@{
|
|
|
|
//! Simpler but slower overload.
|
|
bool String(const Ch* const& str) { return String(str, internal::StrLen(str)); }
|
|
bool Key(const Ch* const& str) { return Key(str, internal::StrLen(str)); }
|
|
|
|
//@}
|
|
|
|
//! Write a raw JSON value.
|
|
/*!
|
|
For user to write a stringified JSON as a value.
|
|
|
|
\param json A well-formed JSON value. It should not contain null character within [0, length - 1] range.
|
|
\param length Length of the json.
|
|
\param type Type of the root of json.
|
|
*/
|
|
bool RawValue(const Ch* json, size_t length, Type type) {
|
|
RAPIDJSON_ASSERT(json != 0);
|
|
Prefix(type);
|
|
return EndValue(WriteRawValue(json, length));
|
|
}
|
|
|
|
//! Flush the output stream.
|
|
/*!
|
|
Allows the user to flush the output stream immediately.
|
|
*/
|
|
void Flush() {
|
|
os_->Flush();
|
|
}
|
|
|
|
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() {
|
|
PutReserve(*os_, 4);
|
|
PutUnsafe(*os_, 'n'); PutUnsafe(*os_, 'u'); PutUnsafe(*os_, 'l'); PutUnsafe(*os_, 'l'); return true;
|
|
}
|
|
|
|
bool WriteBool(bool b) {
|
|
if (b) {
|
|
PutReserve(*os_, 4);
|
|
PutUnsafe(*os_, 't'); PutUnsafe(*os_, 'r'); PutUnsafe(*os_, 'u'); PutUnsafe(*os_, 'e');
|
|
}
|
|
else {
|
|
PutReserve(*os_, 5);
|
|
PutUnsafe(*os_, 'f'); PutUnsafe(*os_, 'a'); PutUnsafe(*os_, 'l'); PutUnsafe(*os_, 's'); PutUnsafe(*os_, 'e');
|
|
}
|
|
return true;
|
|
}
|
|
|
|
bool WriteInt(int i) {
|
|
char buffer[11];
|
|
const char* end = internal::i32toa(i, buffer);
|
|
PutReserve(*os_, static_cast<size_t>(end - buffer));
|
|
for (const char* p = buffer; p != end; ++p)
|
|
PutUnsafe(*os_, static_cast<typename OutputStream::Ch>(*p));
|
|
return true;
|
|
}
|
|
|
|
bool WriteUint(unsigned u) {
|
|
char buffer[10];
|
|
const char* end = internal::u32toa(u, buffer);
|
|
PutReserve(*os_, static_cast<size_t>(end - buffer));
|
|
for (const char* p = buffer; p != end; ++p)
|
|
PutUnsafe(*os_, static_cast<typename OutputStream::Ch>(*p));
|
|
return true;
|
|
}
|
|
|
|
bool WriteInt64(int64_t i64) {
|
|
char buffer[21];
|
|
const char* end = internal::i64toa(i64, buffer);
|
|
PutReserve(*os_, static_cast<size_t>(end - buffer));
|
|
for (const char* p = buffer; p != end; ++p)
|
|
PutUnsafe(*os_, static_cast<typename OutputStream::Ch>(*p));
|
|
return true;
|
|
}
|
|
|
|
bool WriteUint64(uint64_t u64) {
|
|
char buffer[20];
|
|
char* end = internal::u64toa(u64, buffer);
|
|
PutReserve(*os_, static_cast<size_t>(end - buffer));
|
|
for (char* p = buffer; p != end; ++p)
|
|
PutUnsafe(*os_, static_cast<typename OutputStream::Ch>(*p));
|
|
return true;
|
|
}
|
|
|
|
bool WriteDouble(double d) {
|
|
if (internal::Double(d).IsNanOrInf()) {
|
|
if (!(writeFlags & kWriteNanAndInfFlag))
|
|
return false;
|
|
if (internal::Double(d).IsNan()) {
|
|
PutReserve(*os_, 3);
|
|
PutUnsafe(*os_, 'N'); PutUnsafe(*os_, 'a'); PutUnsafe(*os_, 'N');
|
|
return true;
|
|
}
|
|
if (internal::Double(d).Sign()) {
|
|
PutReserve(*os_, 9);
|
|
PutUnsafe(*os_, '-');
|
|
}
|
|
else
|
|
PutReserve(*os_, 8);
|
|
PutUnsafe(*os_, 'I'); PutUnsafe(*os_, 'n'); PutUnsafe(*os_, 'f');
|
|
PutUnsafe(*os_, 'i'); PutUnsafe(*os_, 'n'); PutUnsafe(*os_, 'i'); PutUnsafe(*os_, 't'); PutUnsafe(*os_, 'y');
|
|
return true;
|
|
}
|
|
|
|
char buffer[25];
|
|
char* end = internal::dtoa(d, buffer, maxDecimalPlaces_);
|
|
PutReserve(*os_, static_cast<size_t>(end - buffer));
|
|
for (char* p = buffer; p != end; ++p)
|
|
PutUnsafe(*os_, static_cast<typename OutputStream::Ch>(*p));
|
|
return true;
|
|
}
|
|
|
|
bool WriteString(const Ch* str, SizeType length) {
|
|
static const typename OutputStream::Ch 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
|
|
};
|
|
|
|
if (TargetEncoding::supportUnicode)
|
|
PutReserve(*os_, 2 + length * 6); // "\uxxxx..."
|
|
else
|
|
PutReserve(*os_, 2 + length * 12); // "\uxxxx\uyyyy..."
|
|
|
|
PutUnsafe(*os_, '\"');
|
|
GenericStringStream<SourceEncoding> is(str);
|
|
while (ScanWriteUnescapedString(is, length)) {
|
|
const Ch c = is.Peek();
|
|
if (!TargetEncoding::supportUnicode && static_cast<unsigned>(c) >= 0x80) {
|
|
// Unicode escaping
|
|
unsigned codepoint;
|
|
if (RAPIDJSON_UNLIKELY(!SourceEncoding::Decode(is, &codepoint)))
|
|
return false;
|
|
PutUnsafe(*os_, '\\');
|
|
PutUnsafe(*os_, 'u');
|
|
if (codepoint <= 0xD7FF || (codepoint >= 0xE000 && codepoint <= 0xFFFF)) {
|
|
PutUnsafe(*os_, hexDigits[(codepoint >> 12) & 15]);
|
|
PutUnsafe(*os_, hexDigits[(codepoint >> 8) & 15]);
|
|
PutUnsafe(*os_, hexDigits[(codepoint >> 4) & 15]);
|
|
PutUnsafe(*os_, hexDigits[(codepoint ) & 15]);
|
|
}
|
|
else {
|
|
RAPIDJSON_ASSERT(codepoint >= 0x010000 && codepoint <= 0x10FFFF);
|
|
// Surrogate pair
|
|
unsigned s = codepoint - 0x010000;
|
|
unsigned lead = (s >> 10) + 0xD800;
|
|
unsigned trail = (s & 0x3FF) + 0xDC00;
|
|
PutUnsafe(*os_, hexDigits[(lead >> 12) & 15]);
|
|
PutUnsafe(*os_, hexDigits[(lead >> 8) & 15]);
|
|
PutUnsafe(*os_, hexDigits[(lead >> 4) & 15]);
|
|
PutUnsafe(*os_, hexDigits[(lead ) & 15]);
|
|
PutUnsafe(*os_, '\\');
|
|
PutUnsafe(*os_, 'u');
|
|
PutUnsafe(*os_, hexDigits[(trail >> 12) & 15]);
|
|
PutUnsafe(*os_, hexDigits[(trail >> 8) & 15]);
|
|
PutUnsafe(*os_, hexDigits[(trail >> 4) & 15]);
|
|
PutUnsafe(*os_, hexDigits[(trail ) & 15]);
|
|
}
|
|
}
|
|
else if ((sizeof(Ch) == 1 || static_cast<unsigned>(c) < 256) && RAPIDJSON_UNLIKELY(escape[static_cast<unsigned char>(c)])) {
|
|
is.Take();
|
|
PutUnsafe(*os_, '\\');
|
|
PutUnsafe(*os_, static_cast<typename OutputStream::Ch>(escape[static_cast<unsigned char>(c)]));
|
|
if (escape[static_cast<unsigned char>(c)] == 'u') {
|
|
PutUnsafe(*os_, '0');
|
|
PutUnsafe(*os_, '0');
|
|
PutUnsafe(*os_, hexDigits[static_cast<unsigned char>(c) >> 4]);
|
|
PutUnsafe(*os_, hexDigits[static_cast<unsigned char>(c) & 0xF]);
|
|
}
|
|
}
|
|
else if (RAPIDJSON_UNLIKELY(!(writeFlags & kWriteValidateEncodingFlag ?
|
|
Transcoder<SourceEncoding, TargetEncoding>::Validate(is, *os_) :
|
|
Transcoder<SourceEncoding, TargetEncoding>::TranscodeUnsafe(is, *os_))))
|
|
return false;
|
|
}
|
|
PutUnsafe(*os_, '\"');
|
|
return true;
|
|
}
|
|
|
|
bool ScanWriteUnescapedString(GenericStringStream<SourceEncoding>& is, size_t length) {
|
|
return RAPIDJSON_LIKELY(is.Tell() < length);
|
|
}
|
|
|
|
bool WriteStartObject() { os_->Put('{'); return true; }
|
|
bool WriteEndObject() { os_->Put('}'); return true; }
|
|
bool WriteStartArray() { os_->Put('['); return true; }
|
|
bool WriteEndArray() { os_->Put(']'); return true; }
|
|
|
|
bool WriteRawValue(const Ch* json, size_t length) {
|
|
PutReserve(*os_, length);
|
|
GenericStringStream<SourceEncoding> is(json);
|
|
while (RAPIDJSON_LIKELY(is.Tell() < length)) {
|
|
RAPIDJSON_ASSERT(is.Peek() != '\0');
|
|
if (RAPIDJSON_UNLIKELY(!(writeFlags & kWriteValidateEncodingFlag ?
|
|
Transcoder<SourceEncoding, TargetEncoding>::Validate(is, *os_) :
|
|
Transcoder<SourceEncoding, TargetEncoding>::TranscodeUnsafe(is, *os_))))
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
void Prefix(Type type) {
|
|
(void)type;
|
|
if (RAPIDJSON_LIKELY(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;
|
|
}
|
|
}
|
|
|
|
// Flush the value if it is the top level one.
|
|
bool EndValue(bool ret) {
|
|
if (RAPIDJSON_UNLIKELY(level_stack_.Empty())) // end of json text
|
|
Flush();
|
|
return ret;
|
|
}
|
|
|
|
OutputStream* os_;
|
|
internal::Stack<StackAllocator> level_stack_;
|
|
int maxDecimalPlaces_;
|
|
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(static_cast<size_t>(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(static_cast<size_t>(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(static_cast<size_t>(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(static_cast<size_t>(20 - (end - buffer)));
|
|
return true;
|
|
}
|
|
|
|
template<>
|
|
inline bool Writer<StringBuffer>::WriteDouble(double d) {
|
|
if (internal::Double(d).IsNanOrInf()) {
|
|
// Note: This code path can only be reached if (RAPIDJSON_WRITE_DEFAULT_FLAGS & kWriteNanAndInfFlag).
|
|
if (!(kWriteDefaultFlags & kWriteNanAndInfFlag))
|
|
return false;
|
|
if (internal::Double(d).IsNan()) {
|
|
PutReserve(*os_, 3);
|
|
PutUnsafe(*os_, 'N'); PutUnsafe(*os_, 'a'); PutUnsafe(*os_, 'N');
|
|
return true;
|
|
}
|
|
if (internal::Double(d).Sign()) {
|
|
PutReserve(*os_, 9);
|
|
PutUnsafe(*os_, '-');
|
|
}
|
|
else
|
|
PutReserve(*os_, 8);
|
|
PutUnsafe(*os_, 'I'); PutUnsafe(*os_, 'n'); PutUnsafe(*os_, 'f');
|
|
PutUnsafe(*os_, 'i'); PutUnsafe(*os_, 'n'); PutUnsafe(*os_, 'i'); PutUnsafe(*os_, 't'); PutUnsafe(*os_, 'y');
|
|
return true;
|
|
}
|
|
|
|
char *buffer = os_->Push(25);
|
|
char* end = internal::dtoa(d, buffer, maxDecimalPlaces_);
|
|
os_->Pop(static_cast<size_t>(25 - (end - buffer)));
|
|
return true;
|
|
}
|
|
|
|
#if defined(RAPIDJSON_SSE2) || defined(RAPIDJSON_SSE42)
|
|
template<>
|
|
inline bool Writer<StringBuffer>::ScanWriteUnescapedString(StringStream& is, size_t length) {
|
|
if (length < 16)
|
|
return RAPIDJSON_LIKELY(is.Tell() < length);
|
|
|
|
if (!RAPIDJSON_LIKELY(is.Tell() < length))
|
|
return false;
|
|
|
|
const char* p = is.src_;
|
|
const char* end = is.head_ + length;
|
|
const char* nextAligned = reinterpret_cast<const char*>((reinterpret_cast<size_t>(p) + 15) & static_cast<size_t>(~15));
|
|
const char* endAligned = reinterpret_cast<const char*>(reinterpret_cast<size_t>(end) & static_cast<size_t>(~15));
|
|
if (nextAligned > end)
|
|
return true;
|
|
|
|
while (p != nextAligned)
|
|
if (*p < 0x20 || *p == '\"' || *p == '\\') {
|
|
is.src_ = p;
|
|
return RAPIDJSON_LIKELY(is.Tell() < length);
|
|
}
|
|
else
|
|
os_->PutUnsafe(*p++);
|
|
|
|
// The rest of string using SIMD
|
|
static const char dquote[16] = { '\"', '\"', '\"', '\"', '\"', '\"', '\"', '\"', '\"', '\"', '\"', '\"', '\"', '\"', '\"', '\"' };
|
|
static const char bslash[16] = { '\\', '\\', '\\', '\\', '\\', '\\', '\\', '\\', '\\', '\\', '\\', '\\', '\\', '\\', '\\', '\\' };
|
|
static const char space[16] = { 0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x1F };
|
|
const __m128i dq = _mm_loadu_si128(reinterpret_cast<const __m128i *>(&dquote[0]));
|
|
const __m128i bs = _mm_loadu_si128(reinterpret_cast<const __m128i *>(&bslash[0]));
|
|
const __m128i sp = _mm_loadu_si128(reinterpret_cast<const __m128i *>(&space[0]));
|
|
|
|
for (; p != endAligned; p += 16) {
|
|
const __m128i s = _mm_load_si128(reinterpret_cast<const __m128i *>(p));
|
|
const __m128i t1 = _mm_cmpeq_epi8(s, dq);
|
|
const __m128i t2 = _mm_cmpeq_epi8(s, bs);
|
|
const __m128i t3 = _mm_cmpeq_epi8(_mm_max_epu8(s, sp), sp); // s < 0x20 <=> max(s, 0x1F) == 0x1F
|
|
const __m128i x = _mm_or_si128(_mm_or_si128(t1, t2), t3);
|
|
unsigned short r = static_cast<unsigned short>(_mm_movemask_epi8(x));
|
|
if (RAPIDJSON_UNLIKELY(r != 0)) { // some of characters is escaped
|
|
SizeType len;
|
|
#ifdef _MSC_VER // Find the index of first escaped
|
|
unsigned long offset;
|
|
_BitScanForward(&offset, r);
|
|
len = offset;
|
|
#else
|
|
len = static_cast<SizeType>(__builtin_ffs(r) - 1);
|
|
#endif
|
|
char* q = reinterpret_cast<char*>(os_->PushUnsafe(len));
|
|
for (size_t i = 0; i < len; i++)
|
|
q[i] = p[i];
|
|
|
|
p += len;
|
|
break;
|
|
}
|
|
_mm_storeu_si128(reinterpret_cast<__m128i *>(os_->PushUnsafe(16)), s);
|
|
}
|
|
|
|
is.src_ = p;
|
|
return RAPIDJSON_LIKELY(is.Tell() < length);
|
|
}
|
|
#elif defined(RAPIDJSON_NEON)
|
|
template<>
|
|
inline bool Writer<StringBuffer>::ScanWriteUnescapedString(StringStream& is, size_t length) {
|
|
if (length < 16)
|
|
return RAPIDJSON_LIKELY(is.Tell() < length);
|
|
|
|
if (!RAPIDJSON_LIKELY(is.Tell() < length))
|
|
return false;
|
|
|
|
const char* p = is.src_;
|
|
const char* end = is.head_ + length;
|
|
const char* nextAligned = reinterpret_cast<const char*>((reinterpret_cast<size_t>(p) + 15) & static_cast<size_t>(~15));
|
|
const char* endAligned = reinterpret_cast<const char*>(reinterpret_cast<size_t>(end) & static_cast<size_t>(~15));
|
|
if (nextAligned > end)
|
|
return true;
|
|
|
|
while (p != nextAligned)
|
|
if (*p < 0x20 || *p == '\"' || *p == '\\') {
|
|
is.src_ = p;
|
|
return RAPIDJSON_LIKELY(is.Tell() < length);
|
|
}
|
|
else
|
|
os_->PutUnsafe(*p++);
|
|
|
|
// The rest of string using SIMD
|
|
const uint8x16_t s0 = vmovq_n_u8('"');
|
|
const uint8x16_t s1 = vmovq_n_u8('\\');
|
|
const uint8x16_t s2 = vmovq_n_u8('\b');
|
|
const uint8x16_t s3 = vmovq_n_u8(32);
|
|
|
|
for (; p != endAligned; p += 16) {
|
|
const uint8x16_t s = vld1q_u8(reinterpret_cast<const uint8_t *>(p));
|
|
uint8x16_t x = vceqq_u8(s, s0);
|
|
x = vorrq_u8(x, vceqq_u8(s, s1));
|
|
x = vorrq_u8(x, vceqq_u8(s, s2));
|
|
x = vorrq_u8(x, vcltq_u8(s, s3));
|
|
|
|
x = vrev64q_u8(x); // Rev in 64
|
|
uint64_t low = vgetq_lane_u64(reinterpret_cast<uint64x2_t>(x), 0); // extract
|
|
uint64_t high = vgetq_lane_u64(reinterpret_cast<uint64x2_t>(x), 1); // extract
|
|
|
|
SizeType len = 0;
|
|
bool escaped = false;
|
|
if (low == 0) {
|
|
if (high != 0) {
|
|
unsigned lz = (unsigned)__builtin_clzll(high);
|
|
len = 8 + (lz >> 3);
|
|
escaped = true;
|
|
}
|
|
} else {
|
|
unsigned lz = (unsigned)__builtin_clzll(low);
|
|
len = lz >> 3;
|
|
escaped = true;
|
|
}
|
|
if (RAPIDJSON_UNLIKELY(escaped)) { // some of characters is escaped
|
|
char* q = reinterpret_cast<char*>(os_->PushUnsafe(len));
|
|
for (size_t i = 0; i < len; i++)
|
|
q[i] = p[i];
|
|
|
|
p += len;
|
|
break;
|
|
}
|
|
vst1q_u8(reinterpret_cast<uint8_t *>(os_->PushUnsafe(16)), s);
|
|
}
|
|
|
|
is.src_ = p;
|
|
return RAPIDJSON_LIKELY(is.Tell() < length);
|
|
}
|
|
#endif // RAPIDJSON_NEON
|
|
|
|
RAPIDJSON_NAMESPACE_END
|
|
|
|
#if defined(_MSC_VER) || defined(__clang__)
|
|
RAPIDJSON_DIAG_POP
|
|
#endif
|
|
|
|
#endif // RAPIDJSON_RAPIDJSON_H_
|