1 | // Tencent is pleased to support the open source community by making RapidJSON available. |
2 | // |
3 | // Copyright (C) 2015 THL A29 Limited, a Tencent company, and Milo Yip. All rights reserved. |
4 | // |
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 |
7 | // |
8 | // http://opensource.org/licenses/MIT |
9 | // |
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. |
14 | |
15 | #ifndef RAPIDJSON_WRITER_H_ |
16 | #define RAPIDJSON_WRITER_H_ |
17 | |
18 | #include "stream.h" |
19 | #include "internal/stack.h" |
20 | #include "internal/strfunc.h" |
21 | #include "internal/dtoa.h" |
22 | #include "internal/itoa.h" |
23 | #include "stringbuffer.h" |
24 | #include <new> // placement new |
25 | |
26 | #if defined(RAPIDJSON_SIMD) && defined(_MSC_VER) |
27 | #include <intrin.h> |
28 | #pragma intrinsic(_BitScanForward) |
29 | #endif |
30 | #ifdef RAPIDJSON_SSE42 |
31 | #include <nmmintrin.h> |
32 | #elif defined(RAPIDJSON_SSE2) |
33 | #include <emmintrin.h> |
34 | #endif |
35 | |
36 | #ifdef _MSC_VER |
37 | RAPIDJSON_DIAG_PUSH |
38 | RAPIDJSON_DIAG_OFF(4127) // conditional expression is constant |
39 | #endif |
40 | |
41 | #ifdef __clang__ |
42 | RAPIDJSON_DIAG_PUSH |
43 | RAPIDJSON_DIAG_OFF(padded) |
44 | RAPIDJSON_DIAG_OFF(unreachable-code) |
45 | #endif |
46 | |
47 | RAPIDJSON_NAMESPACE_BEGIN |
48 | |
49 | /////////////////////////////////////////////////////////////////////////////// |
50 | // WriteFlag |
51 | |
52 | /*! \def RAPIDJSON_WRITE_DEFAULT_FLAGS |
53 | \ingroup RAPIDJSON_CONFIG |
54 | \brief User-defined kWriteDefaultFlags definition. |
55 | |
56 | User can define this as any \c WriteFlag combinations. |
57 | */ |
58 | #ifndef RAPIDJSON_WRITE_DEFAULT_FLAGS |
59 | #define RAPIDJSON_WRITE_DEFAULT_FLAGS kWriteNoFlags |
60 | #endif |
61 | |
62 | //! Combination of writeFlags |
63 | enum WriteFlag { |
64 | kWriteNoFlags = 0, //!< No flags are set. |
65 | kWriteValidateEncodingFlag = 1, //!< Validate encoding of JSON strings. |
66 | kWriteNanAndInfFlag = 2, //!< Allow writing of Infinity, -Infinity and NaN. |
67 | kWriteDefaultFlags = RAPIDJSON_WRITE_DEFAULT_FLAGS //!< Default write flags. Can be customized by defining RAPIDJSON_WRITE_DEFAULT_FLAGS |
68 | }; |
69 | |
70 | //! JSON writer |
71 | /*! Writer implements the concept Handler. |
72 | It generates JSON text by events to an output os. |
73 | |
74 | User may programmatically calls the functions of a writer to generate JSON text. |
75 | |
76 | On the other side, a writer can also be passed to objects that generates events, |
77 | |
78 | for example Reader::Parse() and Document::Accept(). |
79 | |
80 | \tparam OutputStream Type of output stream. |
81 | \tparam SourceEncoding Encoding of source string. |
82 | \tparam TargetEncoding Encoding of output stream. |
83 | \tparam StackAllocator Type of allocator for allocating memory of stack. |
84 | \note implements Handler concept |
85 | */ |
86 | template<typename OutputStream, typename SourceEncoding = UTF8<>, typename TargetEncoding = UTF8<>, typename StackAllocator = CrtAllocator, unsigned writeFlags = kWriteDefaultFlags> |
87 | class Writer { |
88 | public: |
89 | typedef typename SourceEncoding::Ch Ch; |
90 | |
91 | static const int kDefaultMaxDecimalPlaces = 324; |
92 | |
93 | //! Constructor |
94 | /*! \param os Output stream. |
95 | \param stackAllocator User supplied allocator. If it is null, it will create a private one. |
96 | \param levelDepth Initial capacity of stack. |
97 | */ |
98 | explicit |
99 | Writer(OutputStream& os, StackAllocator* stackAllocator = 0, size_t levelDepth = kDefaultLevelDepth) : |
100 | os_(&os), level_stack_(stackAllocator, levelDepth * sizeof(Level)), maxDecimalPlaces_(kDefaultMaxDecimalPlaces), hasRoot_(false) {} |
101 | |
102 | explicit |
103 | Writer(StackAllocator* allocator = 0, size_t levelDepth = kDefaultLevelDepth) : |
104 | os_(0), level_stack_(allocator, levelDepth * sizeof(Level)), maxDecimalPlaces_(kDefaultMaxDecimalPlaces), hasRoot_(false) {} |
105 | |
106 | //! Reset the writer with a new stream. |
107 | /*! |
108 | This function reset the writer with a new stream and default settings, |
109 | in order to make a Writer object reusable for output multiple JSONs. |
110 | |
111 | \param os New output stream. |
112 | \code |
113 | Writer<OutputStream> writer(os1); |
114 | writer.StartObject(); |
115 | // ... |
116 | writer.EndObject(); |
117 | |
118 | writer.Reset(os2); |
119 | writer.StartObject(); |
120 | // ... |
121 | writer.EndObject(); |
122 | \endcode |
123 | */ |
124 | void Reset(OutputStream& os) { |
125 | os_ = &os; |
126 | hasRoot_ = false; |
127 | level_stack_.Clear(); |
128 | } |
129 | |
130 | //! Checks whether the output is a complete JSON. |
131 | /*! |
132 | A complete JSON has a complete root object or array. |
133 | */ |
134 | bool IsComplete() const { |
135 | return hasRoot_ && level_stack_.Empty(); |
136 | } |
137 | |
138 | int GetMaxDecimalPlaces() const { |
139 | return maxDecimalPlaces_; |
140 | } |
141 | |
142 | //! Sets the maximum number of decimal places for double output. |
143 | /*! |
144 | This setting truncates the output with specified number of decimal places. |
145 | |
146 | For example, |
147 | |
148 | \code |
149 | writer.SetMaxDecimalPlaces(3); |
150 | writer.StartArray(); |
151 | writer.Double(0.12345); // "0.123" |
152 | writer.Double(0.0001); // "0.0" |
153 | writer.Double(1.234567890123456e30); // "1.234567890123456e30" (do not truncate significand for positive exponent) |
154 | writer.Double(1.23e-4); // "0.0" (do truncate significand for negative exponent) |
155 | writer.EndArray(); |
156 | \endcode |
157 | |
158 | The default setting does not truncate any decimal places. You can restore to this setting by calling |
159 | \code |
160 | writer.SetMaxDecimalPlaces(Writer::kDefaultMaxDecimalPlaces); |
161 | \endcode |
162 | */ |
163 | void SetMaxDecimalPlaces(int maxDecimalPlaces) { |
164 | maxDecimalPlaces_ = maxDecimalPlaces; |
165 | } |
166 | |
167 | /*!@name Implementation of Handler |
168 | \see Handler |
169 | */ |
170 | //@{ |
171 | |
172 | bool Null() { Prefix(kNullType); return EndValue(WriteNull()); } |
173 | bool Bool(bool b) { Prefix(b ? kTrueType : kFalseType); return EndValue(WriteBool(b)); } |
174 | bool Int(int i) { Prefix(kNumberType); return EndValue(WriteInt(i)); } |
175 | bool Uint(unsigned u) { Prefix(kNumberType); return EndValue(WriteUint(u)); } |
176 | bool Int64(int64_t i64) { Prefix(kNumberType); return EndValue(WriteInt64(i64)); } |
177 | bool Uint64(uint64_t u64) { Prefix(kNumberType); return EndValue(WriteUint64(u64)); } |
178 | |
179 | //! Writes the given \c double value to the stream |
180 | /*! |
181 | \param d The value to be written. |
182 | \return Whether it is succeed. |
183 | */ |
184 | bool Double(double d) { Prefix(kNumberType); return EndValue(WriteDouble(d)); } |
185 | |
186 | bool RawNumber(const Ch* str, SizeType length, bool copy = false) { |
187 | (void)copy; |
188 | Prefix(kNumberType); |
189 | return EndValue(WriteString(str, length)); |
190 | } |
191 | |
192 | bool String(const Ch* str, SizeType length, bool copy = false) { |
193 | (void)copy; |
194 | Prefix(kStringType); |
195 | return EndValue(WriteString(str, length)); |
196 | } |
197 | |
198 | #if RAPIDJSON_HAS_STDSTRING |
199 | bool String(const std::basic_string<Ch>& str) { |
200 | return String(str.data(), SizeType(str.size())); |
201 | } |
202 | #endif |
203 | |
204 | bool StartObject() { |
205 | Prefix(kObjectType); |
206 | new (level_stack_.template Push<Level>()) Level(false); |
207 | return WriteStartObject(); |
208 | } |
209 | |
210 | bool Key(const Ch* str, SizeType length, bool copy = false) { return String(str, length, copy); } |
211 | |
212 | bool EndObject(SizeType memberCount = 0) { |
213 | (void)memberCount; |
214 | RAPIDJSON_ASSERT(level_stack_.GetSize() >= sizeof(Level)); |
215 | RAPIDJSON_ASSERT(!level_stack_.template Top<Level>()->inArray); |
216 | level_stack_.template Pop<Level>(1); |
217 | return EndValue(WriteEndObject()); |
218 | } |
219 | |
220 | bool StartArray() { |
221 | Prefix(kArrayType); |
222 | new (level_stack_.template Push<Level>()) Level(true); |
223 | return WriteStartArray(); |
224 | } |
225 | |
226 | bool EndArray(SizeType elementCount = 0) { |
227 | (void)elementCount; |
228 | RAPIDJSON_ASSERT(level_stack_.GetSize() >= sizeof(Level)); |
229 | RAPIDJSON_ASSERT(level_stack_.template Top<Level>()->inArray); |
230 | level_stack_.template Pop<Level>(1); |
231 | return EndValue(WriteEndArray()); |
232 | } |
233 | //@} |
234 | |
235 | /*! @name Convenience extensions */ |
236 | //@{ |
237 | |
238 | //! Simpler but slower overload. |
239 | bool String(const Ch* str) { return String(str, internal::StrLen(str)); } |
240 | bool Key(const Ch* str) { return Key(str, internal::StrLen(str)); } |
241 | |
242 | //@} |
243 | |
244 | //! Write a raw JSON value. |
245 | /*! |
246 | For user to write a stringified JSON as a value. |
247 | |
248 | \param json A well-formed JSON value. It should not contain null character within [0, length - 1] range. |
249 | \param length Length of the json. |
250 | \param type Type of the root of json. |
251 | */ |
252 | bool RawValue(const Ch* json, size_t length, Type type) { Prefix(type); return EndValue(WriteRawValue(json, length)); } |
253 | |
254 | protected: |
255 | //! Information for each nested level |
256 | struct Level { |
257 | Level(bool inArray_) : valueCount(0), inArray(inArray_) {} |
258 | size_t valueCount; //!< number of values in this level |
259 | bool inArray; //!< true if in array, otherwise in object |
260 | }; |
261 | |
262 | static const size_t kDefaultLevelDepth = 32; |
263 | |
264 | bool WriteNull() { |
265 | PutReserve(*os_, 4); |
266 | PutUnsafe(*os_, 'n'); PutUnsafe(*os_, 'u'); PutUnsafe(*os_, 'l'); PutUnsafe(*os_, 'l'); return true; |
267 | } |
268 | |
269 | bool WriteBool(bool b) { |
270 | if (b) { |
271 | PutReserve(*os_, 4); |
272 | PutUnsafe(*os_, 't'); PutUnsafe(*os_, 'r'); PutUnsafe(*os_, 'u'); PutUnsafe(*os_, 'e'); |
273 | } |
274 | else { |
275 | PutReserve(*os_, 5); |
276 | PutUnsafe(*os_, 'f'); PutUnsafe(*os_, 'a'); PutUnsafe(*os_, 'l'); PutUnsafe(*os_, 's'); PutUnsafe(*os_, 'e'); |
277 | } |
278 | return true; |
279 | } |
280 | |
281 | bool WriteInt(int i) { |
282 | char buffer[11]; |
283 | const char* end = internal::i32toa(i, buffer); |
284 | PutReserve(*os_, static_cast<size_t>(end - buffer)); |
285 | for (const char* p = buffer; p != end; ++p) |
286 | PutUnsafe(*os_, static_cast<typename TargetEncoding::Ch>(*p)); |
287 | return true; |
288 | } |
289 | |
290 | bool WriteUint(unsigned u) { |
291 | char buffer[10]; |
292 | const char* end = internal::u32toa(u, buffer); |
293 | PutReserve(*os_, static_cast<size_t>(end - buffer)); |
294 | for (const char* p = buffer; p != end; ++p) |
295 | PutUnsafe(*os_, static_cast<typename TargetEncoding::Ch>(*p)); |
296 | return true; |
297 | } |
298 | |
299 | bool WriteInt64(int64_t i64) { |
300 | char buffer[21]; |
301 | const char* end = internal::i64toa(i64, buffer); |
302 | PutReserve(*os_, static_cast<size_t>(end - buffer)); |
303 | for (const char* p = buffer; p != end; ++p) |
304 | PutUnsafe(*os_, static_cast<typename TargetEncoding::Ch>(*p)); |
305 | return true; |
306 | } |
307 | |
308 | bool WriteUint64(uint64_t u64) { |
309 | char buffer[20]; |
310 | char* end = internal::u64toa(u64, buffer); |
311 | PutReserve(*os_, static_cast<size_t>(end - buffer)); |
312 | for (char* p = buffer; p != end; ++p) |
313 | PutUnsafe(*os_, static_cast<typename TargetEncoding::Ch>(*p)); |
314 | return true; |
315 | } |
316 | |
317 | bool WriteDouble(double d) { |
318 | if (internal::Double(d).IsNanOrInf()) { |
319 | if (!(writeFlags & kWriteNanAndInfFlag)) |
320 | return false; |
321 | if (internal::Double(d).IsNan()) { |
322 | PutReserve(*os_, 3); |
323 | PutUnsafe(*os_, 'N'); PutUnsafe(*os_, 'a'); PutUnsafe(*os_, 'N'); |
324 | return true; |
325 | } |
326 | if (internal::Double(d).Sign()) { |
327 | PutReserve(*os_, 9); |
328 | PutUnsafe(*os_, '-'); |
329 | } |
330 | else |
331 | PutReserve(*os_, 8); |
332 | PutUnsafe(*os_, 'I'); PutUnsafe(*os_, 'n'); PutUnsafe(*os_, 'f'); |
333 | PutUnsafe(*os_, 'i'); PutUnsafe(*os_, 'n'); PutUnsafe(*os_, 'i'); PutUnsafe(*os_, 't'); PutUnsafe(*os_, 'y'); |
334 | return true; |
335 | } |
336 | |
337 | char buffer[25]; |
338 | char* end = internal::dtoa(d, buffer, maxDecimalPlaces_); |
339 | PutReserve(*os_, static_cast<size_t>(end - buffer)); |
340 | for (char* p = buffer; p != end; ++p) |
341 | PutUnsafe(*os_, static_cast<typename TargetEncoding::Ch>(*p)); |
342 | return true; |
343 | } |
344 | |
345 | bool WriteString(const Ch* str, SizeType length) { |
346 | static const typename TargetEncoding::Ch hexDigits[16] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' }; |
347 | static const char escape[256] = { |
348 | #define Z16 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 |
349 | //0 1 2 3 4 5 6 7 8 9 A B C D E F |
350 | 'u', 'u', 'u', 'u', 'u', 'u', 'u', 'u', 'b', 't', 'n', 'u', 'f', 'r', 'u', 'u', // 00 |
351 | 'u', 'u', 'u', 'u', 'u', 'u', 'u', 'u', 'u', 'u', 'u', 'u', 'u', 'u', 'u', 'u', // 10 |
352 | 0, 0, '"', 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 20 |
353 | Z16, Z16, // 30~4F |
354 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,'\\', 0, 0, 0, // 50 |
355 | Z16, Z16, Z16, Z16, Z16, Z16, Z16, Z16, Z16, Z16 // 60~FF |
356 | #undef Z16 |
357 | }; |
358 | |
359 | if (TargetEncoding::supportUnicode) |
360 | PutReserve(*os_, 2 + length * 6); // "\uxxxx..." |
361 | else |
362 | PutReserve(*os_, 2 + length * 12); // "\uxxxx\uyyyy..." |
363 | |
364 | PutUnsafe(*os_, '\"'); |
365 | GenericStringStream<SourceEncoding> is(str); |
366 | while (ScanWriteUnescapedString(is, length)) { |
367 | const Ch c = is.Peek(); |
368 | if (!TargetEncoding::supportUnicode && static_cast<unsigned>(c) >= 0x80) { |
369 | // Unicode escaping |
370 | unsigned codepoint; |
371 | if (RAPIDJSON_UNLIKELY(!SourceEncoding::Decode(is, &codepoint))) |
372 | return false; |
373 | PutUnsafe(*os_, '\\'); |
374 | PutUnsafe(*os_, 'u'); |
375 | if (codepoint <= 0xD7FF || (codepoint >= 0xE000 && codepoint <= 0xFFFF)) { |
376 | PutUnsafe(*os_, hexDigits[(codepoint >> 12) & 15]); |
377 | PutUnsafe(*os_, hexDigits[(codepoint >> 8) & 15]); |
378 | PutUnsafe(*os_, hexDigits[(codepoint >> 4) & 15]); |
379 | PutUnsafe(*os_, hexDigits[(codepoint ) & 15]); |
380 | } |
381 | else { |
382 | RAPIDJSON_ASSERT(codepoint >= 0x010000 && codepoint <= 0x10FFFF); |
383 | // Surrogate pair |
384 | unsigned s = codepoint - 0x010000; |
385 | unsigned lead = (s >> 10) + 0xD800; |
386 | unsigned trail = (s & 0x3FF) + 0xDC00; |
387 | PutUnsafe(*os_, hexDigits[(lead >> 12) & 15]); |
388 | PutUnsafe(*os_, hexDigits[(lead >> 8) & 15]); |
389 | PutUnsafe(*os_, hexDigits[(lead >> 4) & 15]); |
390 | PutUnsafe(*os_, hexDigits[(lead ) & 15]); |
391 | PutUnsafe(*os_, '\\'); |
392 | PutUnsafe(*os_, 'u'); |
393 | PutUnsafe(*os_, hexDigits[(trail >> 12) & 15]); |
394 | PutUnsafe(*os_, hexDigits[(trail >> 8) & 15]); |
395 | PutUnsafe(*os_, hexDigits[(trail >> 4) & 15]); |
396 | PutUnsafe(*os_, hexDigits[(trail ) & 15]); |
397 | } |
398 | } |
399 | else if ((sizeof(Ch) == 1 || static_cast<unsigned>(c) < 256) && RAPIDJSON_UNLIKELY(escape[static_cast<unsigned char>(c)])) { |
400 | is.Take(); |
401 | PutUnsafe(*os_, '\\'); |
402 | PutUnsafe(*os_, static_cast<typename TargetEncoding::Ch>(escape[static_cast<unsigned char>(c)])); |
403 | if (escape[static_cast<unsigned char>(c)] == 'u') { |
404 | PutUnsafe(*os_, '0'); |
405 | PutUnsafe(*os_, '0'); |
406 | PutUnsafe(*os_, hexDigits[static_cast<unsigned char>(c) >> 4]); |
407 | PutUnsafe(*os_, hexDigits[static_cast<unsigned char>(c) & 0xF]); |
408 | } |
409 | } |
410 | else if (RAPIDJSON_UNLIKELY(!(writeFlags & kWriteValidateEncodingFlag ? |
411 | Transcoder<SourceEncoding, TargetEncoding>::Validate(is, *os_) : |
412 | Transcoder<SourceEncoding, TargetEncoding>::TranscodeUnsafe(is, *os_)))) |
413 | return false; |
414 | } |
415 | PutUnsafe(*os_, '\"'); |
416 | return true; |
417 | } |
418 | |
419 | bool ScanWriteUnescapedString(GenericStringStream<SourceEncoding>& is, size_t length) { |
420 | return RAPIDJSON_LIKELY(is.Tell() < length); |
421 | } |
422 | |
423 | bool WriteStartObject() { os_->Put('{'); return true; } |
424 | bool WriteEndObject() { os_->Put('}'); return true; } |
425 | bool WriteStartArray() { os_->Put('['); return true; } |
426 | bool WriteEndArray() { os_->Put(']'); return true; } |
427 | |
428 | bool WriteRawValue(const Ch* json, size_t length) { |
429 | PutReserve(*os_, length); |
430 | for (size_t i = 0; i < length; i++) { |
431 | RAPIDJSON_ASSERT(json[i] != '\0'); |
432 | PutUnsafe(*os_, json[i]); |
433 | } |
434 | return true; |
435 | } |
436 | |
437 | void Prefix(Type type) { |
438 | (void)type; |
439 | if (RAPIDJSON_LIKELY(level_stack_.GetSize() != 0)) { // this value is not at root |
440 | Level* level = level_stack_.template Top<Level>(); |
441 | if (level->valueCount > 0) { |
442 | if (level->inArray) |
443 | os_->Put(','); // add comma if it is not the first element in array |
444 | else // in object |
445 | os_->Put((level->valueCount % 2 == 0) ? ',' : ':'); |
446 | } |
447 | if (!level->inArray && level->valueCount % 2 == 0) |
448 | RAPIDJSON_ASSERT(type == kStringType); // if it's in object, then even number should be a name |
449 | level->valueCount++; |
450 | } |
451 | else { |
452 | RAPIDJSON_ASSERT(!hasRoot_); // Should only has one and only one root. |
453 | hasRoot_ = true; |
454 | } |
455 | } |
456 | |
457 | // Flush the value if it is the top level one. |
458 | bool EndValue(bool ret) { |
459 | if (RAPIDJSON_UNLIKELY(level_stack_.Empty())) // end of json text |
460 | os_->Flush(); |
461 | return ret; |
462 | } |
463 | |
464 | OutputStream* os_; |
465 | internal::Stack<StackAllocator> level_stack_; |
466 | int maxDecimalPlaces_; |
467 | bool hasRoot_; |
468 | |
469 | private: |
470 | // Prohibit copy constructor & assignment operator. |
471 | Writer(const Writer&); |
472 | Writer& operator=(const Writer&); |
473 | }; |
474 | |
475 | // Full specialization for StringStream to prevent memory copying |
476 | |
477 | template<> |
478 | inline bool Writer<StringBuffer>::WriteInt(int i) { |
479 | char *buffer = os_->Push(11); |
480 | const char* end = internal::i32toa(i, buffer); |
481 | os_->Pop(static_cast<size_t>(11 - (end - buffer))); |
482 | return true; |
483 | } |
484 | |
485 | template<> |
486 | inline bool Writer<StringBuffer>::WriteUint(unsigned u) { |
487 | char *buffer = os_->Push(10); |
488 | const char* end = internal::u32toa(u, buffer); |
489 | os_->Pop(static_cast<size_t>(10 - (end - buffer))); |
490 | return true; |
491 | } |
492 | |
493 | template<> |
494 | inline bool Writer<StringBuffer>::WriteInt64(int64_t i64) { |
495 | char *buffer = os_->Push(21); |
496 | const char* end = internal::i64toa(i64, buffer); |
497 | os_->Pop(static_cast<size_t>(21 - (end - buffer))); |
498 | return true; |
499 | } |
500 | |
501 | template<> |
502 | inline bool Writer<StringBuffer>::WriteUint64(uint64_t u) { |
503 | char *buffer = os_->Push(20); |
504 | const char* end = internal::u64toa(u, buffer); |
505 | os_->Pop(static_cast<size_t>(20 - (end - buffer))); |
506 | return true; |
507 | } |
508 | |
509 | template<> |
510 | inline bool Writer<StringBuffer>::WriteDouble(double d) { |
511 | if (internal::Double(d).IsNanOrInf()) { |
512 | // Note: This code path can only be reached if (RAPIDJSON_WRITE_DEFAULT_FLAGS & kWriteNanAndInfFlag). |
513 | if (!(kWriteDefaultFlags & kWriteNanAndInfFlag)) |
514 | return false; |
515 | if (internal::Double(d).IsNan()) { |
516 | PutReserve(*os_, 3); |
517 | PutUnsafe(*os_, 'N'); PutUnsafe(*os_, 'a'); PutUnsafe(*os_, 'N'); |
518 | return true; |
519 | } |
520 | if (internal::Double(d).Sign()) { |
521 | PutReserve(*os_, 9); |
522 | PutUnsafe(*os_, '-'); |
523 | } |
524 | else |
525 | PutReserve(*os_, 8); |
526 | PutUnsafe(*os_, 'I'); PutUnsafe(*os_, 'n'); PutUnsafe(*os_, 'f'); |
527 | PutUnsafe(*os_, 'i'); PutUnsafe(*os_, 'n'); PutUnsafe(*os_, 'i'); PutUnsafe(*os_, 't'); PutUnsafe(*os_, 'y'); |
528 | return true; |
529 | } |
530 | |
531 | char *buffer = os_->Push(25); |
532 | char* end = internal::dtoa(d, buffer, maxDecimalPlaces_); |
533 | os_->Pop(static_cast<size_t>(25 - (end - buffer))); |
534 | return true; |
535 | } |
536 | |
537 | #if defined(RAPIDJSON_SSE2) || defined(RAPIDJSON_SSE42) |
538 | template<> |
539 | inline bool Writer<StringBuffer>::ScanWriteUnescapedString(StringStream& is, size_t length) { |
540 | if (length < 16) |
541 | return RAPIDJSON_LIKELY(is.Tell() < length); |
542 | |
543 | if (!RAPIDJSON_LIKELY(is.Tell() < length)) |
544 | return false; |
545 | |
546 | const char* p = is.src_; |
547 | const char* end = is.head_ + length; |
548 | const char* nextAligned = reinterpret_cast<const char*>((reinterpret_cast<size_t>(p) + 15) & static_cast<size_t>(~15)); |
549 | const char* endAligned = reinterpret_cast<const char*>(reinterpret_cast<size_t>(end) & static_cast<size_t>(~15)); |
550 | if (nextAligned > end) |
551 | return true; |
552 | |
553 | while (p != nextAligned) |
554 | if (*p < 0x20 || *p == '\"' || *p == '\\') { |
555 | is.src_ = p; |
556 | return RAPIDJSON_LIKELY(is.Tell() < length); |
557 | } |
558 | else |
559 | os_->PutUnsafe(*p++); |
560 | |
561 | // The rest of string using SIMD |
562 | static const char dquote[16] = { '\"', '\"', '\"', '\"', '\"', '\"', '\"', '\"', '\"', '\"', '\"', '\"', '\"', '\"', '\"', '\"' }; |
563 | static const char bslash[16] = { '\\', '\\', '\\', '\\', '\\', '\\', '\\', '\\', '\\', '\\', '\\', '\\', '\\', '\\', '\\', '\\' }; |
564 | static const char space[16] = { 0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19 }; |
565 | const __m128i dq = _mm_loadu_si128(reinterpret_cast<const __m128i *>(&dquote[0])); |
566 | const __m128i bs = _mm_loadu_si128(reinterpret_cast<const __m128i *>(&bslash[0])); |
567 | const __m128i sp = _mm_loadu_si128(reinterpret_cast<const __m128i *>(&space[0])); |
568 | |
569 | for (; p != endAligned; p += 16) { |
570 | const __m128i s = _mm_load_si128(reinterpret_cast<const __m128i *>(p)); |
571 | const __m128i t1 = _mm_cmpeq_epi8(s, dq); |
572 | const __m128i t2 = _mm_cmpeq_epi8(s, bs); |
573 | const __m128i t3 = _mm_cmpeq_epi8(_mm_max_epu8(s, sp), sp); // s < 0x20 <=> max(s, 0x19) == 0x19 |
574 | const __m128i x = _mm_or_si128(_mm_or_si128(t1, t2), t3); |
575 | unsigned short r = static_cast<unsigned short>(_mm_movemask_epi8(x)); |
576 | if (RAPIDJSON_UNLIKELY(r != 0)) { // some of characters is escaped |
577 | SizeType len; |
578 | #ifdef _MSC_VER // Find the index of first escaped |
579 | unsigned long offset; |
580 | _BitScanForward(&offset, r); |
581 | len = offset; |
582 | #else |
583 | len = static_cast<SizeType>(__builtin_ffs(r) - 1); |
584 | #endif |
585 | char* q = reinterpret_cast<char*>(os_->PushUnsafe(len)); |
586 | for (size_t i = 0; i < len; i++) |
587 | q[i] = p[i]; |
588 | |
589 | p += len; |
590 | break; |
591 | } |
592 | _mm_storeu_si128(reinterpret_cast<__m128i *>(os_->PushUnsafe(16)), s); |
593 | } |
594 | |
595 | is.src_ = p; |
596 | return RAPIDJSON_LIKELY(is.Tell() < length); |
597 | } |
598 | #endif // defined(RAPIDJSON_SSE2) || defined(RAPIDJSON_SSE42) |
599 | |
600 | RAPIDJSON_NAMESPACE_END |
601 | |
602 | #ifdef _MSC_VER |
603 | RAPIDJSON_DIAG_POP |
604 | #endif |
605 | |
606 | #ifdef __clang__ |
607 | RAPIDJSON_DIAG_POP |
608 | #endif |
609 | |
610 | #endif // RAPIDJSON_RAPIDJSON_H_ |
611 | |