1 // Tencent is pleased to support the open source community by making RapidJSON available.
3 // Copyright (C) 2015 THL A29 Limited, a Tencent company, and Milo Yip. All rights reserved.
5 // Licensed under the MIT License (the "License"); you may not use this file except
6 // in compliance with the License. You may obtain a copy of the License at
8 // http://opensource.org/licenses/MIT
10 // Unless required by applicable law or agreed to in writing, software distributed
11 // under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
12 // CONDITIONS OF ANY KIND, either express or implied. See the License for the
13 // specific language governing permissions and limitations under the License.
15 #ifndef RAPIDJSON_WRITER_H_
16 #define RAPIDJSON_WRITER_H_
19 #include "internal/clzll.h"
20 #include "internal/meta.h"
21 #include "internal/stack.h"
22 #include "internal/strfunc.h"
23 #include "internal/dtoa.h"
24 #include "internal/itoa.h"
25 #include "stringbuffer.h"
26 #include <new> // placement new
28 #if defined(RAPIDJSON_SIMD) && defined(_MSC_VER)
30 #pragma intrinsic(_BitScanForward)
32 #ifdef RAPIDJSON_SSE42
33 #include <nmmintrin.h>
34 #elif defined(RAPIDJSON_SSE2)
35 #include <emmintrin.h>
36 #elif defined(RAPIDJSON_NEON)
42 RAPIDJSON_DIAG_OFF(padded)
43 RAPIDJSON_DIAG_OFF(unreachable-code)
44 RAPIDJSON_DIAG_OFF(c++98-compat)
45 #elif defined(_MSC_VER)
47 RAPIDJSON_DIAG_OFF(4127) // conditional expression is constant
50 RAPIDJSON_NAMESPACE_BEGIN
52 ///////////////////////////////////////////////////////////////////////////////
55 /*! \def RAPIDJSON_WRITE_DEFAULT_FLAGS
56 \ingroup RAPIDJSON_CONFIG
57 \brief User-defined kWriteDefaultFlags definition.
59 User can define this as any \c WriteFlag combinations.
61 #ifndef RAPIDJSON_WRITE_DEFAULT_FLAGS
62 #define RAPIDJSON_WRITE_DEFAULT_FLAGS kWriteNoFlags
65 //! Combination of writeFlags
67 kWriteNoFlags = 0, //!< No flags are set.
68 kWriteValidateEncodingFlag = 1, //!< Validate encoding of JSON strings.
69 kWriteNanAndInfFlag = 2, //!< Allow writing of Infinity, -Infinity and NaN.
70 kWriteDefaultFlags = RAPIDJSON_WRITE_DEFAULT_FLAGS //!< Default write flags. Can be customized by defining RAPIDJSON_WRITE_DEFAULT_FLAGS
74 /*! Writer implements the concept Handler.
75 It generates JSON text by events to an output os.
77 User may programmatically calls the functions of a writer to generate JSON text.
79 On the other side, a writer can also be passed to objects that generates events,
81 for example Reader::Parse() and Document::Accept().
83 \tparam OutputStream Type of output stream.
84 \tparam SourceEncoding Encoding of source string.
85 \tparam TargetEncoding Encoding of output stream.
86 \tparam StackAllocator Type of allocator for allocating memory of stack.
87 \note implements Handler concept
89 template<typename OutputStream, typename SourceEncoding = UTF8<>, typename TargetEncoding = UTF8<>, typename StackAllocator = CrtAllocator, unsigned writeFlags = kWriteDefaultFlags>
92 typedef typename SourceEncoding::Ch Ch;
94 static const int kDefaultMaxDecimalPlaces = 324;
97 /*! \param os Output stream.
98 \param stackAllocator User supplied allocator. If it is null, it will create a private one.
99 \param levelDepth Initial capacity of stack.
102 Writer(OutputStream& os, StackAllocator* stackAllocator = 0, size_t levelDepth = kDefaultLevelDepth) :
103 os_(&os), level_stack_(stackAllocator, levelDepth * sizeof(Level)), maxDecimalPlaces_(kDefaultMaxDecimalPlaces), hasRoot_(false) {}
106 Writer(StackAllocator* allocator = 0, size_t levelDepth = kDefaultLevelDepth) :
107 os_(0), level_stack_(allocator, levelDepth * sizeof(Level)), maxDecimalPlaces_(kDefaultMaxDecimalPlaces), hasRoot_(false) {}
109 #if RAPIDJSON_HAS_CXX11_RVALUE_REFS
110 Writer(Writer&& rhs) :
111 os_(rhs.os_), level_stack_(std::move(rhs.level_stack_)), maxDecimalPlaces_(rhs.maxDecimalPlaces_), hasRoot_(rhs.hasRoot_) {
116 //! Reset the writer with a new stream.
118 This function reset the writer with a new stream and default settings,
119 in order to make a Writer object reusable for output multiple JSONs.
121 \param os New output stream.
123 Writer<OutputStream> writer(os1);
124 writer.StartObject();
129 writer.StartObject();
134 void Reset(OutputStream& os) {
137 level_stack_.Clear();
140 //! Checks whether the output is a complete JSON.
142 A complete JSON has a complete root object or array.
144 bool IsComplete() const {
145 return hasRoot_ && level_stack_.Empty();
148 int GetMaxDecimalPlaces() const {
149 return maxDecimalPlaces_;
152 //! Sets the maximum number of decimal places for double output.
154 This setting truncates the output with specified number of decimal places.
159 writer.SetMaxDecimalPlaces(3);
161 writer.Double(0.12345); // "0.123"
162 writer.Double(0.0001); // "0.0"
163 writer.Double(1.234567890123456e30); // "1.234567890123456e30" (do not truncate significand for positive exponent)
164 writer.Double(1.23e-4); // "0.0" (do truncate significand for negative exponent)
168 The default setting does not truncate any decimal places. You can restore to this setting by calling
170 writer.SetMaxDecimalPlaces(Writer::kDefaultMaxDecimalPlaces);
173 void SetMaxDecimalPlaces(int maxDecimalPlaces) {
174 maxDecimalPlaces_ = maxDecimalPlaces;
177 /*!@name Implementation of Handler
182 bool Null() { Prefix(kNullType); return EndValue(WriteNull()); }
183 bool Bool(bool b) { Prefix(b ? kTrueType : kFalseType); return EndValue(WriteBool(b)); }
184 bool Int(int i) { Prefix(kNumberType); return EndValue(WriteInt(i)); }
185 bool Uint(unsigned u) { Prefix(kNumberType); return EndValue(WriteUint(u)); }
186 bool Int64(int64_t i64) { Prefix(kNumberType); return EndValue(WriteInt64(i64)); }
187 bool Uint64(uint64_t u64) { Prefix(kNumberType); return EndValue(WriteUint64(u64)); }
189 //! Writes the given \c double value to the stream
191 \param d The value to be written.
192 \return Whether it is succeed.
194 bool Double(double d) { Prefix(kNumberType); return EndValue(WriteDouble(d)); }
196 bool RawNumber(const Ch* str, SizeType length, bool copy = false) {
197 RAPIDJSON_ASSERT(str != 0);
200 return EndValue(WriteString(str, length));
203 bool String(const Ch* str, SizeType length, bool copy = false) {
204 RAPIDJSON_ASSERT(str != 0);
207 return EndValue(WriteString(str, length));
210 #if RAPIDJSON_HAS_STDSTRING
211 bool String(const std::basic_string<Ch>& str) {
212 return String(str.data(), SizeType(str.size()));
218 new (level_stack_.template Push<Level>()) Level(false);
219 return WriteStartObject();
222 bool Key(const Ch* str, SizeType length, bool copy = false) { return String(str, length, copy); }
224 #if RAPIDJSON_HAS_STDSTRING
225 bool Key(const std::basic_string<Ch>& str)
227 return Key(str.data(), SizeType(str.size()));
231 bool EndObject(SizeType memberCount = 0) {
233 RAPIDJSON_ASSERT(level_stack_.GetSize() >= sizeof(Level)); // not inside an Object
234 RAPIDJSON_ASSERT(!level_stack_.template Top<Level>()->inArray); // currently inside an Array, not Object
235 RAPIDJSON_ASSERT(0 == level_stack_.template Top<Level>()->valueCount % 2); // Object has a Key without a Value
236 level_stack_.template Pop<Level>(1);
237 return EndValue(WriteEndObject());
242 new (level_stack_.template Push<Level>()) Level(true);
243 return WriteStartArray();
246 bool EndArray(SizeType elementCount = 0) {
248 RAPIDJSON_ASSERT(level_stack_.GetSize() >= sizeof(Level));
249 RAPIDJSON_ASSERT(level_stack_.template Top<Level>()->inArray);
250 level_stack_.template Pop<Level>(1);
251 return EndValue(WriteEndArray());
255 /*! @name Convenience extensions */
258 //! Simpler but slower overload.
259 bool String(const Ch* const& str) { return String(str, internal::StrLen(str)); }
260 bool Key(const Ch* const& str) { return Key(str, internal::StrLen(str)); }
264 //! Write a raw JSON value.
266 For user to write a stringified JSON as a value.
268 \param json A well-formed JSON value. It should not contain null character within [0, length - 1] range.
269 \param length Length of the json.
270 \param type Type of the root of json.
272 bool RawValue(const Ch* json, size_t length, Type type) {
273 RAPIDJSON_ASSERT(json != 0);
275 return EndValue(WriteRawValue(json, length));
278 //! Flush the output stream.
280 Allows the user to flush the output stream immediately.
286 static const size_t kDefaultLevelDepth = 32;
289 //! Information for each nested level
291 Level(bool inArray_) : valueCount(0), inArray(inArray_) {}
292 size_t valueCount; //!< number of values in this level
293 bool inArray; //!< true if in array, otherwise in object
298 PutUnsafe(*os_, 'n'); PutUnsafe(*os_, 'u'); PutUnsafe(*os_, 'l'); PutUnsafe(*os_, 'l'); return true;
301 bool WriteBool(bool b) {
304 PutUnsafe(*os_, 't'); PutUnsafe(*os_, 'r'); PutUnsafe(*os_, 'u'); PutUnsafe(*os_, 'e');
308 PutUnsafe(*os_, 'f'); PutUnsafe(*os_, 'a'); PutUnsafe(*os_, 'l'); PutUnsafe(*os_, 's'); PutUnsafe(*os_, 'e');
313 bool WriteInt(int i) {
315 const char* end = internal::i32toa(i, buffer);
316 PutReserve(*os_, static_cast<size_t>(end - buffer));
317 for (const char* p = buffer; p != end; ++p)
318 PutUnsafe(*os_, static_cast<typename OutputStream::Ch>(*p));
322 bool WriteUint(unsigned u) {
324 const char* end = internal::u32toa(u, buffer);
325 PutReserve(*os_, static_cast<size_t>(end - buffer));
326 for (const char* p = buffer; p != end; ++p)
327 PutUnsafe(*os_, static_cast<typename OutputStream::Ch>(*p));
331 bool WriteInt64(int64_t i64) {
333 const char* end = internal::i64toa(i64, buffer);
334 PutReserve(*os_, static_cast<size_t>(end - buffer));
335 for (const char* p = buffer; p != end; ++p)
336 PutUnsafe(*os_, static_cast<typename OutputStream::Ch>(*p));
340 bool WriteUint64(uint64_t u64) {
342 char* end = internal::u64toa(u64, buffer);
343 PutReserve(*os_, static_cast<size_t>(end - buffer));
344 for (char* p = buffer; p != end; ++p)
345 PutUnsafe(*os_, static_cast<typename OutputStream::Ch>(*p));
349 bool WriteDouble(double d) {
350 if (internal::Double(d).IsNanOrInf()) {
351 if (!(writeFlags & kWriteNanAndInfFlag))
353 if (internal::Double(d).IsNan()) {
355 PutUnsafe(*os_, 'N'); PutUnsafe(*os_, 'a'); PutUnsafe(*os_, 'N');
358 if (internal::Double(d).Sign()) {
360 PutUnsafe(*os_, '-');
364 PutUnsafe(*os_, 'I'); PutUnsafe(*os_, 'n'); PutUnsafe(*os_, 'f');
365 PutUnsafe(*os_, 'i'); PutUnsafe(*os_, 'n'); PutUnsafe(*os_, 'i'); PutUnsafe(*os_, 't'); PutUnsafe(*os_, 'y');
370 char* end = internal::dtoa(d, buffer, maxDecimalPlaces_);
371 PutReserve(*os_, static_cast<size_t>(end - buffer));
372 for (char* p = buffer; p != end; ++p)
373 PutUnsafe(*os_, static_cast<typename OutputStream::Ch>(*p));
377 bool WriteString(const Ch* str, SizeType length) {
378 static const typename OutputStream::Ch hexDigits[16] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' };
379 static const char escape[256] = {
380 #define Z16 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
381 //0 1 2 3 4 5 6 7 8 9 A B C D E F
382 'u', 'u', 'u', 'u', 'u', 'u', 'u', 'u', 'b', 't', 'n', 'u', 'f', 'r', 'u', 'u', // 00
383 'u', 'u', 'u', 'u', 'u', 'u', 'u', 'u', 'u', 'u', 'u', 'u', 'u', 'u', 'u', 'u', // 10
384 0, 0, '"', 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 20
386 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,'\\', 0, 0, 0, // 50
387 Z16, Z16, Z16, Z16, Z16, Z16, Z16, Z16, Z16, Z16 // 60~FF
391 if (TargetEncoding::supportUnicode)
392 PutReserve(*os_, 2 + length * 6); // "\uxxxx..."
394 PutReserve(*os_, 2 + length * 12); // "\uxxxx\uyyyy..."
396 PutUnsafe(*os_, '\"');
397 GenericStringStream<SourceEncoding> is(str);
398 while (ScanWriteUnescapedString(is, length)) {
399 const Ch c = is.Peek();
400 if (!TargetEncoding::supportUnicode && static_cast<unsigned>(c) >= 0x80) {
403 if (RAPIDJSON_UNLIKELY(!SourceEncoding::Decode(is, &codepoint)))
405 PutUnsafe(*os_, '\\');
406 PutUnsafe(*os_, 'u');
407 if (codepoint <= 0xD7FF || (codepoint >= 0xE000 && codepoint <= 0xFFFF)) {
408 PutUnsafe(*os_, hexDigits[(codepoint >> 12) & 15]);
409 PutUnsafe(*os_, hexDigits[(codepoint >> 8) & 15]);
410 PutUnsafe(*os_, hexDigits[(codepoint >> 4) & 15]);
411 PutUnsafe(*os_, hexDigits[(codepoint ) & 15]);
414 RAPIDJSON_ASSERT(codepoint >= 0x010000 && codepoint <= 0x10FFFF);
416 unsigned s = codepoint - 0x010000;
417 unsigned lead = (s >> 10) + 0xD800;
418 unsigned trail = (s & 0x3FF) + 0xDC00;
419 PutUnsafe(*os_, hexDigits[(lead >> 12) & 15]);
420 PutUnsafe(*os_, hexDigits[(lead >> 8) & 15]);
421 PutUnsafe(*os_, hexDigits[(lead >> 4) & 15]);
422 PutUnsafe(*os_, hexDigits[(lead ) & 15]);
423 PutUnsafe(*os_, '\\');
424 PutUnsafe(*os_, 'u');
425 PutUnsafe(*os_, hexDigits[(trail >> 12) & 15]);
426 PutUnsafe(*os_, hexDigits[(trail >> 8) & 15]);
427 PutUnsafe(*os_, hexDigits[(trail >> 4) & 15]);
428 PutUnsafe(*os_, hexDigits[(trail ) & 15]);
431 else if ((sizeof(Ch) == 1 || static_cast<unsigned>(c) < 256) && RAPIDJSON_UNLIKELY(escape[static_cast<unsigned char>(c)])) {
433 PutUnsafe(*os_, '\\');
434 PutUnsafe(*os_, static_cast<typename OutputStream::Ch>(escape[static_cast<unsigned char>(c)]));
435 if (escape[static_cast<unsigned char>(c)] == 'u') {
436 PutUnsafe(*os_, '0');
437 PutUnsafe(*os_, '0');
438 PutUnsafe(*os_, hexDigits[static_cast<unsigned char>(c) >> 4]);
439 PutUnsafe(*os_, hexDigits[static_cast<unsigned char>(c) & 0xF]);
442 else if (RAPIDJSON_UNLIKELY(!(writeFlags & kWriteValidateEncodingFlag ?
443 Transcoder<SourceEncoding, TargetEncoding>::Validate(is, *os_) :
444 Transcoder<SourceEncoding, TargetEncoding>::TranscodeUnsafe(is, *os_))))
447 PutUnsafe(*os_, '\"');
451 bool ScanWriteUnescapedString(GenericStringStream<SourceEncoding>& is, size_t length) {
452 return RAPIDJSON_LIKELY(is.Tell() < length);
455 bool WriteStartObject() { os_->Put('{'); return true; }
456 bool WriteEndObject() { os_->Put('}'); return true; }
457 bool WriteStartArray() { os_->Put('['); return true; }
458 bool WriteEndArray() { os_->Put(']'); return true; }
460 bool WriteRawValue(const Ch* json, size_t length) {
461 PutReserve(*os_, length);
462 GenericStringStream<SourceEncoding> is(json);
463 while (RAPIDJSON_LIKELY(is.Tell() < length)) {
464 RAPIDJSON_ASSERT(is.Peek() != '\0');
465 if (RAPIDJSON_UNLIKELY(!(writeFlags & kWriteValidateEncodingFlag ?
466 Transcoder<SourceEncoding, TargetEncoding>::Validate(is, *os_) :
467 Transcoder<SourceEncoding, TargetEncoding>::TranscodeUnsafe(is, *os_))))
473 void Prefix(Type type) {
475 if (RAPIDJSON_LIKELY(level_stack_.GetSize() != 0)) { // this value is not at root
476 Level* level = level_stack_.template Top<Level>();
477 if (level->valueCount > 0) {
479 os_->Put(','); // add comma if it is not the first element in array
481 os_->Put((level->valueCount % 2 == 0) ? ',' : ':');
483 if (!level->inArray && level->valueCount % 2 == 0)
484 RAPIDJSON_ASSERT(type == kStringType); // if it's in object, then even number should be a name
488 RAPIDJSON_ASSERT(!hasRoot_); // Should only has one and only one root.
493 // Flush the value if it is the top level one.
494 bool EndValue(bool ret) {
495 if (RAPIDJSON_UNLIKELY(level_stack_.Empty())) // end of json text
501 internal::Stack<StackAllocator> level_stack_;
502 int maxDecimalPlaces_;
506 // Prohibit copy constructor & assignment operator.
507 Writer(const Writer&);
508 Writer& operator=(const Writer&);
511 // Full specialization for StringStream to prevent memory copying
514 inline bool Writer<StringBuffer>::WriteInt(int i) {
515 char *buffer = os_->Push(11);
516 const char* end = internal::i32toa(i, buffer);
517 os_->Pop(static_cast<size_t>(11 - (end - buffer)));
522 inline bool Writer<StringBuffer>::WriteUint(unsigned u) {
523 char *buffer = os_->Push(10);
524 const char* end = internal::u32toa(u, buffer);
525 os_->Pop(static_cast<size_t>(10 - (end - buffer)));
530 inline bool Writer<StringBuffer>::WriteInt64(int64_t i64) {
531 char *buffer = os_->Push(21);
532 const char* end = internal::i64toa(i64, buffer);
533 os_->Pop(static_cast<size_t>(21 - (end - buffer)));
538 inline bool Writer<StringBuffer>::WriteUint64(uint64_t u) {
539 char *buffer = os_->Push(20);
540 const char* end = internal::u64toa(u, buffer);
541 os_->Pop(static_cast<size_t>(20 - (end - buffer)));
546 inline bool Writer<StringBuffer>::WriteDouble(double d) {
547 if (internal::Double(d).IsNanOrInf()) {
548 // Note: This code path can only be reached if (RAPIDJSON_WRITE_DEFAULT_FLAGS & kWriteNanAndInfFlag).
549 if (!(kWriteDefaultFlags & kWriteNanAndInfFlag))
551 if (internal::Double(d).IsNan()) {
553 PutUnsafe(*os_, 'N'); PutUnsafe(*os_, 'a'); PutUnsafe(*os_, 'N');
556 if (internal::Double(d).Sign()) {
558 PutUnsafe(*os_, '-');
562 PutUnsafe(*os_, 'I'); PutUnsafe(*os_, 'n'); PutUnsafe(*os_, 'f');
563 PutUnsafe(*os_, 'i'); PutUnsafe(*os_, 'n'); PutUnsafe(*os_, 'i'); PutUnsafe(*os_, 't'); PutUnsafe(*os_, 'y');
567 char *buffer = os_->Push(25);
568 char* end = internal::dtoa(d, buffer, maxDecimalPlaces_);
569 os_->Pop(static_cast<size_t>(25 - (end - buffer)));
573 #if defined(RAPIDJSON_SSE2) || defined(RAPIDJSON_SSE42)
575 inline bool Writer<StringBuffer>::ScanWriteUnescapedString(StringStream& is, size_t length) {
577 return RAPIDJSON_LIKELY(is.Tell() < length);
579 if (!RAPIDJSON_LIKELY(is.Tell() < length))
582 const char* p = is.src_;
583 const char* end = is.head_ + length;
584 const char* nextAligned = reinterpret_cast<const char*>((reinterpret_cast<size_t>(p) + 15) & static_cast<size_t>(~15));
585 const char* endAligned = reinterpret_cast<const char*>(reinterpret_cast<size_t>(end) & static_cast<size_t>(~15));
586 if (nextAligned > end)
589 while (p != nextAligned)
590 if (*p < 0x20 || *p == '\"' || *p == '\\') {
592 return RAPIDJSON_LIKELY(is.Tell() < length);
595 os_->PutUnsafe(*p++);
597 // The rest of string using SIMD
598 static const char dquote[16] = { '\"', '\"', '\"', '\"', '\"', '\"', '\"', '\"', '\"', '\"', '\"', '\"', '\"', '\"', '\"', '\"' };
599 static const char bslash[16] = { '\\', '\\', '\\', '\\', '\\', '\\', '\\', '\\', '\\', '\\', '\\', '\\', '\\', '\\', '\\', '\\' };
600 static const char space[16] = { 0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x1F };
601 const __m128i dq = _mm_loadu_si128(reinterpret_cast<const __m128i *>(&dquote[0]));
602 const __m128i bs = _mm_loadu_si128(reinterpret_cast<const __m128i *>(&bslash[0]));
603 const __m128i sp = _mm_loadu_si128(reinterpret_cast<const __m128i *>(&space[0]));
605 for (; p != endAligned; p += 16) {
606 const __m128i s = _mm_load_si128(reinterpret_cast<const __m128i *>(p));
607 const __m128i t1 = _mm_cmpeq_epi8(s, dq);
608 const __m128i t2 = _mm_cmpeq_epi8(s, bs);
609 const __m128i t3 = _mm_cmpeq_epi8(_mm_max_epu8(s, sp), sp); // s < 0x20 <=> max(s, 0x1F) == 0x1F
610 const __m128i x = _mm_or_si128(_mm_or_si128(t1, t2), t3);
611 unsigned short r = static_cast<unsigned short>(_mm_movemask_epi8(x));
612 if (RAPIDJSON_UNLIKELY(r != 0)) { // some of characters is escaped
614 #ifdef _MSC_VER // Find the index of first escaped
615 unsigned long offset;
616 _BitScanForward(&offset, r);
619 len = static_cast<SizeType>(__builtin_ffs(r) - 1);
621 char* q = reinterpret_cast<char*>(os_->PushUnsafe(len));
622 for (size_t i = 0; i < len; i++)
628 _mm_storeu_si128(reinterpret_cast<__m128i *>(os_->PushUnsafe(16)), s);
632 return RAPIDJSON_LIKELY(is.Tell() < length);
634 #elif defined(RAPIDJSON_NEON)
636 inline bool Writer<StringBuffer>::ScanWriteUnescapedString(StringStream& is, size_t length) {
638 return RAPIDJSON_LIKELY(is.Tell() < length);
640 if (!RAPIDJSON_LIKELY(is.Tell() < length))
643 const char* p = is.src_;
644 const char* end = is.head_ + length;
645 const char* nextAligned = reinterpret_cast<const char*>((reinterpret_cast<size_t>(p) + 15) & static_cast<size_t>(~15));
646 const char* endAligned = reinterpret_cast<const char*>(reinterpret_cast<size_t>(end) & static_cast<size_t>(~15));
647 if (nextAligned > end)
650 while (p != nextAligned)
651 if (*p < 0x20 || *p == '\"' || *p == '\\') {
653 return RAPIDJSON_LIKELY(is.Tell() < length);
656 os_->PutUnsafe(*p++);
658 // The rest of string using SIMD
659 const uint8x16_t s0 = vmovq_n_u8('"');
660 const uint8x16_t s1 = vmovq_n_u8('\\');
661 const uint8x16_t s2 = vmovq_n_u8('\b');
662 const uint8x16_t s3 = vmovq_n_u8(32);
664 for (; p != endAligned; p += 16) {
665 const uint8x16_t s = vld1q_u8(reinterpret_cast<const uint8_t *>(p));
666 uint8x16_t x = vceqq_u8(s, s0);
667 x = vorrq_u8(x, vceqq_u8(s, s1));
668 x = vorrq_u8(x, vceqq_u8(s, s2));
669 x = vorrq_u8(x, vcltq_u8(s, s3));
671 x = vrev64q_u8(x); // Rev in 64
672 uint64_t low = vgetq_lane_u64(vreinterpretq_u64_u8(x), 0); // extract
673 uint64_t high = vgetq_lane_u64(vreinterpretq_u64_u8(x), 1); // extract
676 bool escaped = false;
679 uint32_t lz = internal::clzll(high);
684 uint32_t lz = internal::clzll(low);
688 if (RAPIDJSON_UNLIKELY(escaped)) { // some of characters is escaped
689 char* q = reinterpret_cast<char*>(os_->PushUnsafe(len));
690 for (size_t i = 0; i < len; i++)
696 vst1q_u8(reinterpret_cast<uint8_t *>(os_->PushUnsafe(16)), s);
700 return RAPIDJSON_LIKELY(is.Tell() < length);
702 #endif // RAPIDJSON_NEON
704 RAPIDJSON_NAMESPACE_END
706 #if defined(_MSC_VER) || defined(__clang__)
710 #endif // RAPIDJSON_RAPIDJSON_H_