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monero/external/rapidjson/reader.h
Riccardo Spagni 32a26332f8
no longer need to pass the size to rapidjson
2015-12-30 12:25:29 +02:00

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// 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_READER_H_
#define RAPIDJSON_READER_H_
/*! \file reader.h */
#include "rapidjson.h"
#include "encodings.h"
#include "internal/meta.h"
#include "internal/stack.h"
#include "internal/strtod.h"
#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>
#endif
#ifdef _MSC_VER
RAPIDJSON_DIAG_PUSH
RAPIDJSON_DIAG_OFF(4127) // conditional expression is constant
RAPIDJSON_DIAG_OFF(4702) // unreachable code
#endif
#ifdef __clang__
RAPIDJSON_DIAG_PUSH
RAPIDJSON_DIAG_OFF(padded)
RAPIDJSON_DIAG_OFF(switch-enum)
#endif
#ifdef __GNUC__
RAPIDJSON_DIAG_PUSH
RAPIDJSON_DIAG_OFF(effc++)
#endif
//!@cond RAPIDJSON_HIDDEN_FROM_DOXYGEN
#define RAPIDJSON_NOTHING /* deliberately empty */
#ifndef RAPIDJSON_PARSE_ERROR_EARLY_RETURN
#define RAPIDJSON_PARSE_ERROR_EARLY_RETURN(value) \
RAPIDJSON_MULTILINEMACRO_BEGIN \
if (HasParseError()) { return value; } \
RAPIDJSON_MULTILINEMACRO_END
#endif
#define RAPIDJSON_PARSE_ERROR_EARLY_RETURN_VOID \
RAPIDJSON_PARSE_ERROR_EARLY_RETURN(RAPIDJSON_NOTHING)
//!@endcond
/*! \def RAPIDJSON_PARSE_ERROR_NORETURN
\ingroup RAPIDJSON_ERRORS
\brief Macro to indicate a parse error.
\param parseErrorCode \ref rapidjson::ParseErrorCode of the error
\param offset position of the error in JSON input (\c size_t)
This macros can be used as a customization point for the internal
error handling mechanism of RapidJSON.
A common usage model is to throw an exception instead of requiring the
caller to explicitly check the \ref rapidjson::GenericReader::Parse's
return value:
\code
#define RAPIDJSON_PARSE_ERROR_NORETURN(parseErrorCode,offset) \
throw ParseException(parseErrorCode, #parseErrorCode, offset)
#include <stdexcept> // std::runtime_error
#include "rapidjson/error/error.h" // rapidjson::ParseResult
struct ParseException : std::runtime_error, rapidjson::ParseResult {
ParseException(rapidjson::ParseErrorCode code, const char* msg, size_t offset)
: std::runtime_error(msg), ParseResult(code, offset) {}
};
#include "rapidjson/reader.h"
\endcode
\see RAPIDJSON_PARSE_ERROR, rapidjson::GenericReader::Parse
*/
#ifndef RAPIDJSON_PARSE_ERROR_NORETURN
#define RAPIDJSON_PARSE_ERROR_NORETURN(parseErrorCode, offset) \
RAPIDJSON_MULTILINEMACRO_BEGIN \
RAPIDJSON_ASSERT(!HasParseError()); /* Error can only be assigned once */ \
SetParseError(parseErrorCode, offset); \
RAPIDJSON_MULTILINEMACRO_END
#endif
/*! \def RAPIDJSON_PARSE_ERROR
\ingroup RAPIDJSON_ERRORS
\brief (Internal) macro to indicate and handle a parse error.
\param parseErrorCode \ref rapidjson::ParseErrorCode of the error
\param offset position of the error in JSON input (\c size_t)
Invokes RAPIDJSON_PARSE_ERROR_NORETURN and stops the parsing.
\see RAPIDJSON_PARSE_ERROR_NORETURN
\hideinitializer
*/
#ifndef RAPIDJSON_PARSE_ERROR
#define RAPIDJSON_PARSE_ERROR(parseErrorCode, offset) \
RAPIDJSON_MULTILINEMACRO_BEGIN \
RAPIDJSON_PARSE_ERROR_NORETURN(parseErrorCode, offset); \
RAPIDJSON_PARSE_ERROR_EARLY_RETURN_VOID; \
RAPIDJSON_MULTILINEMACRO_END
#endif
#include "error/error.h" // ParseErrorCode, ParseResult
RAPIDJSON_NAMESPACE_BEGIN
///////////////////////////////////////////////////////////////////////////////
// ParseFlag
/*! \def RAPIDJSON_PARSE_DEFAULT_FLAGS
\ingroup RAPIDJSON_CONFIG
\brief User-defined kParseDefaultFlags definition.
User can define this as any \c ParseFlag combinations.
*/
#ifndef RAPIDJSON_PARSE_DEFAULT_FLAGS
#define RAPIDJSON_PARSE_DEFAULT_FLAGS kParseNoFlags
#endif
//! Combination of parseFlags
/*! \see Reader::Parse, Document::Parse, Document::ParseInsitu, Document::ParseStream
*/
enum ParseFlag {
kParseNoFlags = 0, //!< No flags are set.
kParseInsituFlag = 1, //!< In-situ(destructive) parsing.
kParseValidateEncodingFlag = 2, //!< Validate encoding of JSON strings.
kParseIterativeFlag = 4, //!< Iterative(constant complexity in terms of function call stack size) parsing.
kParseStopWhenDoneFlag = 8, //!< After parsing a complete JSON root from stream, stop further processing the rest of stream. When this flag is used, parser will not generate kParseErrorDocumentRootNotSingular error.
kParseFullPrecisionFlag = 16, //!< Parse number in full precision (but slower).
kParseCommentsFlag = 32, //!< Allow one-line (//) and multi-line (/**/) comments.
kParseDefaultFlags = RAPIDJSON_PARSE_DEFAULT_FLAGS //!< Default parse flags. Can be customized by defining RAPIDJSON_PARSE_DEFAULT_FLAGS
};
///////////////////////////////////////////////////////////////////////////////
// Handler
/*! \class rapidjson::Handler
\brief Concept for receiving events from GenericReader upon parsing.
The functions return true if no error occurs. If they return false,
the event publisher should terminate the process.
\code
concept Handler {
typename Ch;
bool Null();
bool Bool(bool b);
bool Int(int i);
bool Uint(unsigned i);
bool Int64(int64_t i);
bool Uint64(uint64_t i);
bool Double(double d);
bool String(const Ch* str, SizeType length, bool copy);
bool StartObject();
bool Key(const Ch* str, SizeType length, bool copy);
bool EndObject(SizeType memberCount);
bool StartArray();
bool EndArray(SizeType elementCount);
};
\endcode
*/
///////////////////////////////////////////////////////////////////////////////
// BaseReaderHandler
//! Default implementation of Handler.
/*! This can be used as base class of any reader handler.
\note implements Handler concept
*/
template<typename Encoding = UTF8<>, typename Derived = void>
struct BaseReaderHandler {
typedef typename Encoding::Ch Ch;
typedef typename internal::SelectIf<internal::IsSame<Derived, void>, BaseReaderHandler, Derived>::Type Override;
bool Default() { return true; }
bool Null() { return static_cast<Override&>(*this).Default(); }
bool Bool(bool) { return static_cast<Override&>(*this).Default(); }
bool Int(int) { return static_cast<Override&>(*this).Default(); }
bool Uint(unsigned) { return static_cast<Override&>(*this).Default(); }
bool Int64(int64_t) { return static_cast<Override&>(*this).Default(); }
bool Uint64(uint64_t) { return static_cast<Override&>(*this).Default(); }
bool Double(double) { return static_cast<Override&>(*this).Default(); }
bool String(const Ch*, SizeType, bool) { return static_cast<Override&>(*this).Default(); }
bool StartObject() { return static_cast<Override&>(*this).Default(); }
bool Key(const Ch* str, SizeType len, bool copy) { return static_cast<Override&>(*this).String(str, len, copy); }
bool EndObject(SizeType) { return static_cast<Override&>(*this).Default(); }
bool StartArray() { return static_cast<Override&>(*this).Default(); }
bool EndArray(SizeType) { return static_cast<Override&>(*this).Default(); }
};
///////////////////////////////////////////////////////////////////////////////
// StreamLocalCopy
namespace internal {
template<typename Stream, int = StreamTraits<Stream>::copyOptimization>
class StreamLocalCopy;
//! Do copy optimization.
template<typename Stream>
class StreamLocalCopy<Stream, 1> {
public:
StreamLocalCopy(Stream& original) : s(original), original_(original) {}
~StreamLocalCopy() { original_ = s; }
Stream s;
private:
StreamLocalCopy& operator=(const StreamLocalCopy&) /* = delete */;
Stream& original_;
};
//! Keep reference.
template<typename Stream>
class StreamLocalCopy<Stream, 0> {
public:
StreamLocalCopy(Stream& original) : s(original) {}
Stream& s;
private:
StreamLocalCopy& operator=(const StreamLocalCopy&) /* = delete */;
};
} // namespace internal
///////////////////////////////////////////////////////////////////////////////
// SkipWhitespace
//! Skip the JSON white spaces in a stream.
/*! \param is A input stream for skipping white spaces.
\note This function has SSE2/SSE4.2 specialization.
*/
template<typename InputStream>
void SkipWhitespace(InputStream& is) {
internal::StreamLocalCopy<InputStream> copy(is);
InputStream& s(copy.s);
while (s.Peek() == ' ' || s.Peek() == '\n' || s.Peek() == '\r' || s.Peek() == '\t')
s.Take();
}
#ifdef RAPIDJSON_SSE42
//! Skip whitespace with SSE 4.2 pcmpistrm instruction, testing 16 8-byte characters at once.
inline const char *SkipWhitespace_SIMD(const char* p) {
// Fast return for single non-whitespace
if (*p == ' ' || *p == '\n' || *p == '\r' || *p == '\t')
++p;
else
return p;
// 16-byte align to the next boundary
const char* nextAligned = reinterpret_cast<const char*>((reinterpret_cast<size_t>(p) + 15) & static_cast<size_t>(~15));
while (p != nextAligned)
if (*p == ' ' || *p == '\n' || *p == '\r' || *p == '\t')
++p;
else
return p;
// The rest of string using SIMD
static const char whitespace[16] = " \n\r\t";
const __m128i w = _mm_loadu_si128(reinterpret_cast<const __m128i *>(&whitespace[0]));
for (;; p += 16) {
const __m128i s = _mm_load_si128(reinterpret_cast<const __m128i *>(p));
const int r = _mm_cvtsi128_si32(_mm_cmpistrm(w, s, _SIDD_UBYTE_OPS | _SIDD_CMP_EQUAL_ANY | _SIDD_BIT_MASK | _SIDD_NEGATIVE_POLARITY));
if (r != 0) { // some of characters is non-whitespace
#ifdef _MSC_VER // Find the index of first non-whitespace
unsigned long offset;
_BitScanForward(&offset, r);
return p + offset;
#else
return p + __builtin_ffs(r) - 1;
#endif
}
}
}
#elif defined(RAPIDJSON_SSE2)
//! Skip whitespace with SSE2 instructions, testing 16 8-byte characters at once.
inline const char *SkipWhitespace_SIMD(const char* p) {
// Fast return for single non-whitespace
if (*p == ' ' || *p == '\n' || *p == '\r' || *p == '\t')
++p;
else
return p;
// 16-byte align to the next boundary
const char* nextAligned = reinterpret_cast<const char*>((reinterpret_cast<size_t>(p) + 15) & static_cast<size_t>(~15));
while (p != nextAligned)
if (*p == ' ' || *p == '\n' || *p == '\r' || *p == '\t')
++p;
else
return p;
// The rest of string
static const char whitespaces[4][17] = {
" ",
"\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n",
"\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r",
"\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t"};
const __m128i w0 = _mm_loadu_si128(reinterpret_cast<const __m128i *>(&whitespaces[0][0]));
const __m128i w1 = _mm_loadu_si128(reinterpret_cast<const __m128i *>(&whitespaces[1][0]));
const __m128i w2 = _mm_loadu_si128(reinterpret_cast<const __m128i *>(&whitespaces[2][0]));
const __m128i w3 = _mm_loadu_si128(reinterpret_cast<const __m128i *>(&whitespaces[3][0]));
for (;; p += 16) {
const __m128i s = _mm_load_si128(reinterpret_cast<const __m128i *>(p));
__m128i x = _mm_cmpeq_epi8(s, w0);
x = _mm_or_si128(x, _mm_cmpeq_epi8(s, w1));
x = _mm_or_si128(x, _mm_cmpeq_epi8(s, w2));
x = _mm_or_si128(x, _mm_cmpeq_epi8(s, w3));
unsigned short r = static_cast<unsigned short>(~_mm_movemask_epi8(x));
if (r != 0) { // some of characters may be non-whitespace
#ifdef _MSC_VER // Find the index of first non-whitespace
unsigned long offset;
_BitScanForward(&offset, r);
return p + offset;
#else
return p + __builtin_ffs(r) - 1;
#endif
}
}
}
#endif // RAPIDJSON_SSE2
#ifdef RAPIDJSON_SIMD
//! Template function specialization for InsituStringStream
template<> inline void SkipWhitespace(InsituStringStream& is) {
is.src_ = const_cast<char*>(SkipWhitespace_SIMD(is.src_));
}
//! Template function specialization for StringStream
template<> inline void SkipWhitespace(StringStream& is) {
is.src_ = SkipWhitespace_SIMD(is.src_);
}
#endif // RAPIDJSON_SIMD
///////////////////////////////////////////////////////////////////////////////
// GenericReader
//! SAX-style JSON parser. Use \ref Reader for UTF8 encoding and default allocator.
/*! GenericReader parses JSON text from a stream, and send events synchronously to an
object implementing Handler concept.
It needs to allocate a stack for storing a single decoded string during
non-destructive parsing.
For in-situ parsing, the decoded string is directly written to the source
text string, no temporary buffer is required.
A GenericReader object can be reused for parsing multiple JSON text.
\tparam SourceEncoding Encoding of the input stream.
\tparam TargetEncoding Encoding of the parse output.
\tparam StackAllocator Allocator type for stack.
*/
template <typename SourceEncoding, typename TargetEncoding, typename StackAllocator = CrtAllocator>
class GenericReader {
public:
typedef typename SourceEncoding::Ch Ch; //!< SourceEncoding character type
//! Constructor.
/*! \param stackAllocator Optional allocator for allocating stack memory. (Only use for non-destructive parsing)
\param stackCapacity stack capacity in bytes for storing a single decoded string. (Only use for non-destructive parsing)
*/
GenericReader(StackAllocator* stackAllocator = 0, size_t stackCapacity = kDefaultStackCapacity) : stack_(stackAllocator, stackCapacity), parseResult_() {}
//! Parse JSON text.
/*! \tparam parseFlags Combination of \ref ParseFlag.
\tparam InputStream Type of input stream, implementing Stream concept.
\tparam Handler Type of handler, implementing Handler concept.
\param is Input stream to be parsed.
\param handler The handler to receive events.
\return Whether the parsing is successful.
*/
template <unsigned parseFlags, typename InputStream, typename Handler>
ParseResult Parse(InputStream& is, Handler& handler) {
if (parseFlags & kParseIterativeFlag)
return IterativeParse<parseFlags>(is, handler);
parseResult_.Clear();
ClearStackOnExit scope(*this);
SkipWhitespaceAndComments<parseFlags>(is);
RAPIDJSON_PARSE_ERROR_EARLY_RETURN(parseResult_);
if (is.Peek() == '\0') {
RAPIDJSON_PARSE_ERROR_NORETURN(kParseErrorDocumentEmpty, is.Tell());
RAPIDJSON_PARSE_ERROR_EARLY_RETURN(parseResult_);
}
else {
ParseValue<parseFlags>(is, handler);
RAPIDJSON_PARSE_ERROR_EARLY_RETURN(parseResult_);
if (!(parseFlags & kParseStopWhenDoneFlag)) {
SkipWhitespaceAndComments<parseFlags>(is);
RAPIDJSON_PARSE_ERROR_EARLY_RETURN(parseResult_);
if (is.Peek() != '\0') {
RAPIDJSON_PARSE_ERROR_NORETURN(kParseErrorDocumentRootNotSingular, is.Tell());
RAPIDJSON_PARSE_ERROR_EARLY_RETURN(parseResult_);
}
}
}
return parseResult_;
}
//! Parse JSON text (with \ref kParseDefaultFlags)
/*! \tparam InputStream Type of input stream, implementing Stream concept
\tparam Handler Type of handler, implementing Handler concept.
\param is Input stream to be parsed.
\param handler The handler to receive events.
\return Whether the parsing is successful.
*/
template <typename InputStream, typename Handler>
ParseResult Parse(InputStream& is, Handler& handler) {
return Parse<kParseDefaultFlags>(is, handler);
}
//! Whether a parse error has occured in the last parsing.
bool HasParseError() const { return parseResult_.IsError(); }
//! Get the \ref ParseErrorCode of last parsing.
ParseErrorCode GetParseErrorCode() const { return parseResult_.Code(); }
//! Get the position of last parsing error in input, 0 otherwise.
size_t GetErrorOffset() const { return parseResult_.Offset(); }
protected:
void SetParseError(ParseErrorCode code, size_t offset) { parseResult_.Set(code, offset); }
private:
// Prohibit copy constructor & assignment operator.
GenericReader(const GenericReader&);
GenericReader& operator=(const GenericReader&);
void ClearStack() { stack_.Clear(); }
// clear stack on any exit from ParseStream, e.g. due to exception
struct ClearStackOnExit {
explicit ClearStackOnExit(GenericReader& r) : r_(r) {}
~ClearStackOnExit() { r_.ClearStack(); }
private:
GenericReader& r_;
ClearStackOnExit(const ClearStackOnExit&);
ClearStackOnExit& operator=(const ClearStackOnExit&);
};
template<unsigned parseFlags, typename InputStream>
void SkipWhitespaceAndComments(InputStream& is) {
SkipWhitespace(is);
if (parseFlags & kParseCommentsFlag) {
while (is.Peek() == '/') {
is.Take();
if (is.Peek() == '*') {
is.Take();
while (true) {
if (is.Peek() == '\0')
RAPIDJSON_PARSE_ERROR(kParseErrorUnspecificSyntaxError, is.Tell());
if (is.Take() == '*') {
if (is.Peek() == '\0')
RAPIDJSON_PARSE_ERROR(kParseErrorUnspecificSyntaxError, is.Tell());
if (is.Take() == '/')
break;
}
}
} else if (is.Peek() == '/') {
is.Take();
while (is.Peek() != '\0' && is.Take() != '\n') { }
} else {
RAPIDJSON_PARSE_ERROR(kParseErrorUnspecificSyntaxError, is.Tell());
}
SkipWhitespace(is);
}
}
}
// Parse object: { string : value, ... }
template<unsigned parseFlags, typename InputStream, typename Handler>
void ParseObject(InputStream& is, Handler& handler) {
RAPIDJSON_ASSERT(is.Peek() == '{');
is.Take(); // Skip '{'
if (!handler.StartObject())
RAPIDJSON_PARSE_ERROR(kParseErrorTermination, is.Tell());
SkipWhitespaceAndComments<parseFlags>(is);
RAPIDJSON_PARSE_ERROR_EARLY_RETURN_VOID;
if (is.Peek() == '}') {
is.Take();
if (!handler.EndObject(0)) // empty object
RAPIDJSON_PARSE_ERROR(kParseErrorTermination, is.Tell());
return;
}
for (SizeType memberCount = 0;;) {
if (is.Peek() != '"')
RAPIDJSON_PARSE_ERROR(kParseErrorObjectMissName, is.Tell());
ParseString<parseFlags>(is, handler, true);
RAPIDJSON_PARSE_ERROR_EARLY_RETURN_VOID;
SkipWhitespaceAndComments<parseFlags>(is);
RAPIDJSON_PARSE_ERROR_EARLY_RETURN_VOID;
if (is.Take() != ':')
RAPIDJSON_PARSE_ERROR(kParseErrorObjectMissColon, is.Tell());
SkipWhitespaceAndComments<parseFlags>(is);
RAPIDJSON_PARSE_ERROR_EARLY_RETURN_VOID;
ParseValue<parseFlags>(is, handler);
RAPIDJSON_PARSE_ERROR_EARLY_RETURN_VOID;
SkipWhitespaceAndComments<parseFlags>(is);
RAPIDJSON_PARSE_ERROR_EARLY_RETURN_VOID;
++memberCount;
switch (is.Take()) {
case ',':
SkipWhitespaceAndComments<parseFlags>(is);
RAPIDJSON_PARSE_ERROR_EARLY_RETURN_VOID;
break;
case '}':
if (!handler.EndObject(memberCount))
RAPIDJSON_PARSE_ERROR(kParseErrorTermination, is.Tell());
return;
default:
RAPIDJSON_PARSE_ERROR(kParseErrorObjectMissCommaOrCurlyBracket, is.Tell());
break;
}
}
}
// Parse array: [ value, ... ]
template<unsigned parseFlags, typename InputStream, typename Handler>
void ParseArray(InputStream& is, Handler& handler) {
RAPIDJSON_ASSERT(is.Peek() == '[');
is.Take(); // Skip '['
if (!handler.StartArray())
RAPIDJSON_PARSE_ERROR(kParseErrorTermination, is.Tell());
SkipWhitespaceAndComments<parseFlags>(is);
RAPIDJSON_PARSE_ERROR_EARLY_RETURN_VOID;
if (is.Peek() == ']') {
is.Take();
if (!handler.EndArray(0)) // empty array
RAPIDJSON_PARSE_ERROR(kParseErrorTermination, is.Tell());
return;
}
for (SizeType elementCount = 0;;) {
ParseValue<parseFlags>(is, handler);
RAPIDJSON_PARSE_ERROR_EARLY_RETURN_VOID;
++elementCount;
SkipWhitespaceAndComments<parseFlags>(is);
RAPIDJSON_PARSE_ERROR_EARLY_RETURN_VOID;
switch (is.Take()) {
case ',':
SkipWhitespaceAndComments<parseFlags>(is);
RAPIDJSON_PARSE_ERROR_EARLY_RETURN_VOID;
break;
case ']':
if (!handler.EndArray(elementCount))
RAPIDJSON_PARSE_ERROR(kParseErrorTermination, is.Tell());
return;
default:
RAPIDJSON_PARSE_ERROR(kParseErrorArrayMissCommaOrSquareBracket, is.Tell());
break;
}
}
}
template<unsigned parseFlags, typename InputStream, typename Handler>
void ParseNull(InputStream& is, Handler& handler) {
RAPIDJSON_ASSERT(is.Peek() == 'n');
is.Take();
if (is.Take() == 'u' && is.Take() == 'l' && is.Take() == 'l') {
if (!handler.Null())
RAPIDJSON_PARSE_ERROR(kParseErrorTermination, is.Tell());
}
else
RAPIDJSON_PARSE_ERROR(kParseErrorValueInvalid, is.Tell() - 1);
}
template<unsigned parseFlags, typename InputStream, typename Handler>
void ParseTrue(InputStream& is, Handler& handler) {
RAPIDJSON_ASSERT(is.Peek() == 't');
is.Take();
if (is.Take() == 'r' && is.Take() == 'u' && is.Take() == 'e') {
if (!handler.Bool(true))
RAPIDJSON_PARSE_ERROR(kParseErrorTermination, is.Tell());
}
else
RAPIDJSON_PARSE_ERROR(kParseErrorValueInvalid, is.Tell() - 1);
}
template<unsigned parseFlags, typename InputStream, typename Handler>
void ParseFalse(InputStream& is, Handler& handler) {
RAPIDJSON_ASSERT(is.Peek() == 'f');
is.Take();
if (is.Take() == 'a' && is.Take() == 'l' && is.Take() == 's' && is.Take() == 'e') {
if (!handler.Bool(false))
RAPIDJSON_PARSE_ERROR(kParseErrorTermination, is.Tell());
}
else
RAPIDJSON_PARSE_ERROR(kParseErrorValueInvalid, is.Tell() - 1);
}
// Helper function to parse four hexidecimal digits in \uXXXX in ParseString().
template<typename InputStream>
unsigned ParseHex4(InputStream& is) {
unsigned codepoint = 0;
for (int i = 0; i < 4; i++) {
Ch c = is.Take();
codepoint <<= 4;
codepoint += static_cast<unsigned>(c);
if (c >= '0' && c <= '9')
codepoint -= '0';
else if (c >= 'A' && c <= 'F')
codepoint -= 'A' - 10;
else if (c >= 'a' && c <= 'f')
codepoint -= 'a' - 10;
else {
RAPIDJSON_PARSE_ERROR_NORETURN(kParseErrorStringUnicodeEscapeInvalidHex, is.Tell() - 1);
RAPIDJSON_PARSE_ERROR_EARLY_RETURN(0);
}
}
return codepoint;
}
template <typename CharType>
class StackStream {
public:
typedef CharType Ch;
StackStream(internal::Stack<StackAllocator>& stack) : stack_(stack), length_(0) {}
RAPIDJSON_FORCEINLINE void Put(Ch c) {
*stack_.template Push<Ch>() = c;
++length_;
}
size_t Length() const { return length_; }
Ch* Pop() {
return stack_.template Pop<Ch>(length_);
}
private:
StackStream(const StackStream&);
StackStream& operator=(const StackStream&);
internal::Stack<StackAllocator>& stack_;
SizeType length_;
};
// Parse string and generate String event. Different code paths for kParseInsituFlag.
template<unsigned parseFlags, typename InputStream, typename Handler>
void ParseString(InputStream& is, Handler& handler, bool isKey = false) {
internal::StreamLocalCopy<InputStream> copy(is);
InputStream& s(copy.s);
bool success = false;
if (parseFlags & kParseInsituFlag) {
typename InputStream::Ch *head = s.PutBegin();
ParseStringToStream<parseFlags, SourceEncoding, SourceEncoding>(s, s);
RAPIDJSON_PARSE_ERROR_EARLY_RETURN_VOID;
size_t length = s.PutEnd(head) - 1;
RAPIDJSON_ASSERT(length <= 0xFFFFFFFF);
const typename TargetEncoding::Ch* const str = reinterpret_cast<typename TargetEncoding::Ch*>(head);
success = (isKey ? handler.Key(str, SizeType(length), false) : handler.String(str, SizeType(length), false));
}
else {
StackStream<typename TargetEncoding::Ch> stackStream(stack_);
ParseStringToStream<parseFlags, SourceEncoding, TargetEncoding>(s, stackStream);
RAPIDJSON_PARSE_ERROR_EARLY_RETURN_VOID;
SizeType length = static_cast<SizeType>(stackStream.Length()) - 1;
const typename TargetEncoding::Ch* const str = stackStream.Pop();
success = (isKey ? handler.Key(str, length, true) : handler.String(str, length, true));
}
if (!success)
RAPIDJSON_PARSE_ERROR(kParseErrorTermination, s.Tell());
}
// Parse string to an output is
// This function handles the prefix/suffix double quotes, escaping, and optional encoding validation.
template<unsigned parseFlags, typename SEncoding, typename TEncoding, typename InputStream, typename OutputStream>
RAPIDJSON_FORCEINLINE void ParseStringToStream(InputStream& is, OutputStream& os) {
//!@cond RAPIDJSON_HIDDEN_FROM_DOXYGEN
#define Z16 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
static const char escape[256] = {
Z16, Z16, 0, 0,'\"', 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,'/',
Z16, Z16, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,'\\', 0, 0, 0,
0, 0,'\b', 0, 0, 0,'\f', 0, 0, 0, 0, 0, 0, 0,'\n', 0,
0, 0,'\r', 0,'\t', 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
Z16, Z16, Z16, Z16, Z16, Z16, Z16, Z16
};
#undef Z16
//!@endcond
RAPIDJSON_ASSERT(is.Peek() == '\"');
is.Take(); // Skip '\"'
for (;;) {
Ch c = is.Peek();
if (c == '\\') { // Escape
is.Take();
Ch e = is.Take();
if ((sizeof(Ch) == 1 || unsigned(e) < 256) && escape[static_cast<unsigned char>(e)])
os.Put(static_cast<typename TEncoding::Ch>(escape[static_cast<unsigned char>(e)]));
else if (e == 'u') { // Unicode
unsigned codepoint = ParseHex4(is);
RAPIDJSON_PARSE_ERROR_EARLY_RETURN_VOID;
if (codepoint >= 0xD800 && codepoint <= 0xDBFF) {
// Handle UTF-16 surrogate pair
if (is.Take() != '\\' || is.Take() != 'u')
RAPIDJSON_PARSE_ERROR(kParseErrorStringUnicodeSurrogateInvalid, is.Tell() - 2);
unsigned codepoint2 = ParseHex4(is);
RAPIDJSON_PARSE_ERROR_EARLY_RETURN_VOID;
if (codepoint2 < 0xDC00 || codepoint2 > 0xDFFF)
RAPIDJSON_PARSE_ERROR(kParseErrorStringUnicodeSurrogateInvalid, is.Tell() - 2);
codepoint = (((codepoint - 0xD800) << 10) | (codepoint2 - 0xDC00)) + 0x10000;
}
TEncoding::Encode(os, codepoint);
}
else
RAPIDJSON_PARSE_ERROR(kParseErrorStringEscapeInvalid, is.Tell() - 1);
}
else if (c == '"') { // Closing double quote
is.Take();
os.Put('\0'); // null-terminate the string
return;
}
else if (c == '\0')
RAPIDJSON_PARSE_ERROR(kParseErrorStringMissQuotationMark, is.Tell() - 1);
else if (static_cast<unsigned>(c) < 0x20) // RFC 4627: unescaped = %x20-21 / %x23-5B / %x5D-10FFFF
RAPIDJSON_PARSE_ERROR(kParseErrorStringEscapeInvalid, is.Tell() - 1);
else {
if (parseFlags & kParseValidateEncodingFlag ?
!Transcoder<SEncoding, TEncoding>::Validate(is, os) :
!Transcoder<SEncoding, TEncoding>::Transcode(is, os))
RAPIDJSON_PARSE_ERROR(kParseErrorStringInvalidEncoding, is.Tell());
}
}
}
template<typename InputStream, bool backup>
class NumberStream;
template<typename InputStream>
class NumberStream<InputStream, false> {
public:
NumberStream(GenericReader& reader, InputStream& s) : is(s) { (void)reader; }
~NumberStream() {}
RAPIDJSON_FORCEINLINE Ch Peek() const { return is.Peek(); }
RAPIDJSON_FORCEINLINE Ch TakePush() { return is.Take(); }
RAPIDJSON_FORCEINLINE Ch Take() { return is.Take(); }
size_t Tell() { return is.Tell(); }
size_t Length() { return 0; }
const char* Pop() { return 0; }
protected:
NumberStream& operator=(const NumberStream&);
InputStream& is;
};
template<typename InputStream>
class NumberStream<InputStream, true> : public NumberStream<InputStream, false> {
typedef NumberStream<InputStream, false> Base;
public:
NumberStream(GenericReader& reader, InputStream& is) : NumberStream<InputStream, false>(reader, is), stackStream(reader.stack_) {}
~NumberStream() {}
RAPIDJSON_FORCEINLINE Ch TakePush() {
stackStream.Put(static_cast<char>(Base::is.Peek()));
return Base::is.Take();
}
size_t Length() { return stackStream.Length(); }
const char* Pop() {
stackStream.Put('\0');
return stackStream.Pop();
}
private:
StackStream<char> stackStream;
};
template<unsigned parseFlags, typename InputStream, typename Handler>
void ParseNumber(InputStream& is, Handler& handler) {
internal::StreamLocalCopy<InputStream> copy(is);
NumberStream<InputStream, (parseFlags & kParseFullPrecisionFlag) != 0> s(*this, copy.s);
// Parse minus
bool minus = false;
if (s.Peek() == '-') {
minus = true;
s.Take();
}
// Parse int: zero / ( digit1-9 *DIGIT )
unsigned i = 0;
uint64_t i64 = 0;
bool use64bit = false;
int significandDigit = 0;
if (s.Peek() == '0') {
i = 0;
s.TakePush();
}
else if (s.Peek() >= '1' && s.Peek() <= '9') {
i = static_cast<unsigned>(s.TakePush() - '0');
if (minus)
while (s.Peek() >= '0' && s.Peek() <= '9') {
if (i >= 214748364) { // 2^31 = 2147483648
if (i != 214748364 || s.Peek() > '8') {
i64 = i;
use64bit = true;
break;
}
}
i = i * 10 + static_cast<unsigned>(s.TakePush() - '0');
significandDigit++;
}
else
while (s.Peek() >= '0' && s.Peek() <= '9') {
if (i >= 429496729) { // 2^32 - 1 = 4294967295
if (i != 429496729 || s.Peek() > '5') {
i64 = i;
use64bit = true;
break;
}
}
i = i * 10 + static_cast<unsigned>(s.TakePush() - '0');
significandDigit++;
}
}
else
RAPIDJSON_PARSE_ERROR(kParseErrorValueInvalid, s.Tell());
// Parse 64bit int
bool useDouble = false;
double d = 0.0;
if (use64bit) {
if (minus)
while (s.Peek() >= '0' && s.Peek() <= '9') {
if (i64 >= RAPIDJSON_UINT64_C2(0x0CCCCCCC, 0xCCCCCCCC)) // 2^63 = 9223372036854775808
if (i64 != RAPIDJSON_UINT64_C2(0x0CCCCCCC, 0xCCCCCCCC) || s.Peek() > '8') {
d = i64;
useDouble = true;
break;
}
i64 = i64 * 10 + static_cast<unsigned>(s.TakePush() - '0');
significandDigit++;
}
else
while (s.Peek() >= '0' && s.Peek() <= '9') {
if (i64 >= RAPIDJSON_UINT64_C2(0x19999999, 0x99999999)) // 2^64 - 1 = 18446744073709551615
if (i64 != RAPIDJSON_UINT64_C2(0x19999999, 0x99999999) || s.Peek() > '5') {
d = i64;
useDouble = true;
break;
}
i64 = i64 * 10 + static_cast<unsigned>(s.TakePush() - '0');
significandDigit++;
}
}
// Force double for big integer
if (useDouble) {
while (s.Peek() >= '0' && s.Peek() <= '9') {
if (d >= 1.7976931348623157e307) // DBL_MAX / 10.0
RAPIDJSON_PARSE_ERROR(kParseErrorNumberTooBig, s.Tell());
d = d * 10 + (s.TakePush() - '0');
}
}
// Parse frac = decimal-point 1*DIGIT
int expFrac = 0;
size_t decimalPosition;
if (s.Peek() == '.') {
s.Take();
decimalPosition = s.Length();
if (!(s.Peek() >= '0' && s.Peek() <= '9'))
RAPIDJSON_PARSE_ERROR(kParseErrorNumberMissFraction, s.Tell());
if (!useDouble) {
#if RAPIDJSON_64BIT
// Use i64 to store significand in 64-bit architecture
if (!use64bit)
i64 = i;
while (s.Peek() >= '0' && s.Peek() <= '9') {
if (i64 > RAPIDJSON_UINT64_C2(0x1FFFFF, 0xFFFFFFFF)) // 2^53 - 1 for fast path
break;
else {
i64 = i64 * 10 + static_cast<unsigned>(s.TakePush() - '0');
--expFrac;
if (i64 != 0)
significandDigit++;
}
}
d = static_cast<double>(i64);
#else
// Use double to store significand in 32-bit architecture
d = static_cast<double>(use64bit ? i64 : i);
#endif
useDouble = true;
}
while (s.Peek() >= '0' && s.Peek() <= '9') {
if (significandDigit < 17) {
d = d * 10.0 + (s.TakePush() - '0');
--expFrac;
if (d > 0.0)
significandDigit++;
}
else
s.TakePush();
}
}
else
decimalPosition = s.Length(); // decimal position at the end of integer.
// Parse exp = e [ minus / plus ] 1*DIGIT
int exp = 0;
if (s.Peek() == 'e' || s.Peek() == 'E') {
if (!useDouble) {
d = use64bit ? i64 : i;
useDouble = true;
}
s.Take();
bool expMinus = false;
if (s.Peek() == '+')
s.Take();
else if (s.Peek() == '-') {
s.Take();
expMinus = true;
}
if (s.Peek() >= '0' && s.Peek() <= '9') {
exp = static_cast<int>(s.Take() - '0');
if (expMinus) {
while (s.Peek() >= '0' && s.Peek() <= '9') {
exp = exp * 10 + static_cast<int>(s.Take() - '0');
if (exp >= 214748364) { // Issue #313: prevent overflow exponent
while (s.Peek() >= '0' && s.Peek() <= '9') // Consume the rest of exponent
s.Take();
}
}
}
else { // positive exp
int maxExp = 308 - expFrac;
while (s.Peek() >= '0' && s.Peek() <= '9') {
exp = exp * 10 + static_cast<int>(s.Take() - '0');
if (exp > maxExp)
RAPIDJSON_PARSE_ERROR(kParseErrorNumberTooBig, s.Tell());
}
}
}
else
RAPIDJSON_PARSE_ERROR(kParseErrorNumberMissExponent, s.Tell());
if (expMinus)
exp = -exp;
}
// Finish parsing, call event according to the type of number.
bool cont = true;
size_t length = s.Length();
const char* decimal = s.Pop(); // Pop stack no matter if it will be used or not.
if (useDouble) {
int p = exp + expFrac;
if (parseFlags & kParseFullPrecisionFlag)
d = internal::StrtodFullPrecision(d, p, decimal, length, decimalPosition, exp);
else
d = internal::StrtodNormalPrecision(d, p);
cont = handler.Double(minus ? -d : d);
}
else {
if (use64bit) {
if (minus)
cont = handler.Int64(static_cast<int64_t>(~i64 + 1));
else
cont = handler.Uint64(i64);
}
else {
if (minus)
cont = handler.Int(static_cast<int32_t>(~i + 1));
else
cont = handler.Uint(i);
}
}
if (!cont)
RAPIDJSON_PARSE_ERROR(kParseErrorTermination, s.Tell());
}
// Parse any JSON value
template<unsigned parseFlags, typename InputStream, typename Handler>
void ParseValue(InputStream& is, Handler& handler) {
switch (is.Peek()) {
case 'n': ParseNull <parseFlags>(is, handler); break;
case 't': ParseTrue <parseFlags>(is, handler); break;
case 'f': ParseFalse <parseFlags>(is, handler); break;
case '"': ParseString<parseFlags>(is, handler); break;
case '{': ParseObject<parseFlags>(is, handler); break;
case '[': ParseArray <parseFlags>(is, handler); break;
default :
ParseNumber<parseFlags>(is, handler);
break;
}
}
// Iterative Parsing
// States
enum IterativeParsingState {
IterativeParsingStartState = 0,
IterativeParsingFinishState,
IterativeParsingErrorState,
// Object states
IterativeParsingObjectInitialState,
IterativeParsingMemberKeyState,
IterativeParsingKeyValueDelimiterState,
IterativeParsingMemberValueState,
IterativeParsingMemberDelimiterState,
IterativeParsingObjectFinishState,
// Array states
IterativeParsingArrayInitialState,
IterativeParsingElementState,
IterativeParsingElementDelimiterState,
IterativeParsingArrayFinishState,
// Single value state
IterativeParsingValueState
};
enum { cIterativeParsingStateCount = IterativeParsingValueState + 1 };
// Tokens
enum Token {
LeftBracketToken = 0,
RightBracketToken,
LeftCurlyBracketToken,
RightCurlyBracketToken,
CommaToken,
ColonToken,
StringToken,
FalseToken,
TrueToken,
NullToken,
NumberToken,
kTokenCount
};
RAPIDJSON_FORCEINLINE Token Tokenize(Ch c) {
//!@cond RAPIDJSON_HIDDEN_FROM_DOXYGEN
#define N NumberToken
#define N16 N,N,N,N,N,N,N,N,N,N,N,N,N,N,N,N
// Maps from ASCII to Token
static const unsigned char tokenMap[256] = {
N16, // 00~0F
N16, // 10~1F
N, N, StringToken, N, N, N, N, N, N, N, N, N, CommaToken, N, N, N, // 20~2F
N, N, N, N, N, N, N, N, N, N, ColonToken, N, N, N, N, N, // 30~3F
N16, // 40~4F
N, N, N, N, N, N, N, N, N, N, N, LeftBracketToken, N, RightBracketToken, N, N, // 50~5F
N, N, N, N, N, N, FalseToken, N, N, N, N, N, N, N, NullToken, N, // 60~6F
N, N, N, N, TrueToken, N, N, N, N, N, N, LeftCurlyBracketToken, N, RightCurlyBracketToken, N, N, // 70~7F
N16, N16, N16, N16, N16, N16, N16, N16 // 80~FF
};
#undef N
#undef N16
//!@endcond
if (sizeof(Ch) == 1 || static_cast<unsigned>(c) < 256)
return static_cast<Token>(tokenMap[static_cast<unsigned char>(c)]);
else
return NumberToken;
}
RAPIDJSON_FORCEINLINE IterativeParsingState Predict(IterativeParsingState state, Token token) {
// current state x one lookahead token -> new state
static const char G[cIterativeParsingStateCount][kTokenCount] = {
// Start
{
IterativeParsingArrayInitialState, // Left bracket
IterativeParsingErrorState, // Right bracket
IterativeParsingObjectInitialState, // Left curly bracket
IterativeParsingErrorState, // Right curly bracket
IterativeParsingErrorState, // Comma
IterativeParsingErrorState, // Colon
IterativeParsingValueState, // String
IterativeParsingValueState, // False
IterativeParsingValueState, // True
IterativeParsingValueState, // Null
IterativeParsingValueState // Number
},
// Finish(sink state)
{
IterativeParsingErrorState, IterativeParsingErrorState, IterativeParsingErrorState, IterativeParsingErrorState, IterativeParsingErrorState,
IterativeParsingErrorState, IterativeParsingErrorState, IterativeParsingErrorState, IterativeParsingErrorState, IterativeParsingErrorState,
IterativeParsingErrorState
},
// Error(sink state)
{
IterativeParsingErrorState, IterativeParsingErrorState, IterativeParsingErrorState, IterativeParsingErrorState, IterativeParsingErrorState,
IterativeParsingErrorState, IterativeParsingErrorState, IterativeParsingErrorState, IterativeParsingErrorState, IterativeParsingErrorState,
IterativeParsingErrorState
},
// ObjectInitial
{
IterativeParsingErrorState, // Left bracket
IterativeParsingErrorState, // Right bracket
IterativeParsingErrorState, // Left curly bracket
IterativeParsingObjectFinishState, // Right curly bracket
IterativeParsingErrorState, // Comma
IterativeParsingErrorState, // Colon
IterativeParsingMemberKeyState, // String
IterativeParsingErrorState, // False
IterativeParsingErrorState, // True
IterativeParsingErrorState, // Null
IterativeParsingErrorState // Number
},
// MemberKey
{
IterativeParsingErrorState, // Left bracket
IterativeParsingErrorState, // Right bracket
IterativeParsingErrorState, // Left curly bracket
IterativeParsingErrorState, // Right curly bracket
IterativeParsingErrorState, // Comma
IterativeParsingKeyValueDelimiterState, // Colon
IterativeParsingErrorState, // String
IterativeParsingErrorState, // False
IterativeParsingErrorState, // True
IterativeParsingErrorState, // Null
IterativeParsingErrorState // Number
},
// KeyValueDelimiter
{
IterativeParsingArrayInitialState, // Left bracket(push MemberValue state)
IterativeParsingErrorState, // Right bracket
IterativeParsingObjectInitialState, // Left curly bracket(push MemberValue state)
IterativeParsingErrorState, // Right curly bracket
IterativeParsingErrorState, // Comma
IterativeParsingErrorState, // Colon
IterativeParsingMemberValueState, // String
IterativeParsingMemberValueState, // False
IterativeParsingMemberValueState, // True
IterativeParsingMemberValueState, // Null
IterativeParsingMemberValueState // Number
},
// MemberValue
{
IterativeParsingErrorState, // Left bracket
IterativeParsingErrorState, // Right bracket
IterativeParsingErrorState, // Left curly bracket
IterativeParsingObjectFinishState, // Right curly bracket
IterativeParsingMemberDelimiterState, // Comma
IterativeParsingErrorState, // Colon
IterativeParsingErrorState, // String
IterativeParsingErrorState, // False
IterativeParsingErrorState, // True
IterativeParsingErrorState, // Null
IterativeParsingErrorState // Number
},
// MemberDelimiter
{
IterativeParsingErrorState, // Left bracket
IterativeParsingErrorState, // Right bracket
IterativeParsingErrorState, // Left curly bracket
IterativeParsingErrorState, // Right curly bracket
IterativeParsingErrorState, // Comma
IterativeParsingErrorState, // Colon
IterativeParsingMemberKeyState, // String
IterativeParsingErrorState, // False
IterativeParsingErrorState, // True
IterativeParsingErrorState, // Null
IterativeParsingErrorState // Number
},
// ObjectFinish(sink state)
{
IterativeParsingErrorState, IterativeParsingErrorState, IterativeParsingErrorState, IterativeParsingErrorState, IterativeParsingErrorState,
IterativeParsingErrorState, IterativeParsingErrorState, IterativeParsingErrorState, IterativeParsingErrorState, IterativeParsingErrorState,
IterativeParsingErrorState
},
// ArrayInitial
{
IterativeParsingArrayInitialState, // Left bracket(push Element state)
IterativeParsingArrayFinishState, // Right bracket
IterativeParsingObjectInitialState, // Left curly bracket(push Element state)
IterativeParsingErrorState, // Right curly bracket
IterativeParsingErrorState, // Comma
IterativeParsingErrorState, // Colon
IterativeParsingElementState, // String
IterativeParsingElementState, // False
IterativeParsingElementState, // True
IterativeParsingElementState, // Null
IterativeParsingElementState // Number
},
// Element
{
IterativeParsingErrorState, // Left bracket
IterativeParsingArrayFinishState, // Right bracket
IterativeParsingErrorState, // Left curly bracket
IterativeParsingErrorState, // Right curly bracket
IterativeParsingElementDelimiterState, // Comma
IterativeParsingErrorState, // Colon
IterativeParsingErrorState, // String
IterativeParsingErrorState, // False
IterativeParsingErrorState, // True
IterativeParsingErrorState, // Null
IterativeParsingErrorState // Number
},
// ElementDelimiter
{
IterativeParsingArrayInitialState, // Left bracket(push Element state)
IterativeParsingErrorState, // Right bracket
IterativeParsingObjectInitialState, // Left curly bracket(push Element state)
IterativeParsingErrorState, // Right curly bracket
IterativeParsingErrorState, // Comma
IterativeParsingErrorState, // Colon
IterativeParsingElementState, // String
IterativeParsingElementState, // False
IterativeParsingElementState, // True
IterativeParsingElementState, // Null
IterativeParsingElementState // Number
},
// ArrayFinish(sink state)
{
IterativeParsingErrorState, IterativeParsingErrorState, IterativeParsingErrorState, IterativeParsingErrorState, IterativeParsingErrorState,
IterativeParsingErrorState, IterativeParsingErrorState, IterativeParsingErrorState, IterativeParsingErrorState, IterativeParsingErrorState,
IterativeParsingErrorState
},
// Single Value (sink state)
{
IterativeParsingErrorState, IterativeParsingErrorState, IterativeParsingErrorState, IterativeParsingErrorState, IterativeParsingErrorState,
IterativeParsingErrorState, IterativeParsingErrorState, IterativeParsingErrorState, IterativeParsingErrorState, IterativeParsingErrorState,
IterativeParsingErrorState
}
}; // End of G
return static_cast<IterativeParsingState>(G[state][token]);
}
// Make an advance in the token stream and state based on the candidate destination state which was returned by Transit().
// May return a new state on state pop.
template <unsigned parseFlags, typename InputStream, typename Handler>
RAPIDJSON_FORCEINLINE IterativeParsingState Transit(IterativeParsingState src, Token token, IterativeParsingState dst, InputStream& is, Handler& handler) {
(void)token;
switch (dst) {
case IterativeParsingErrorState:
return dst;
case IterativeParsingObjectInitialState:
case IterativeParsingArrayInitialState:
{
// Push the state(Element or MemeberValue) if we are nested in another array or value of member.
// In this way we can get the correct state on ObjectFinish or ArrayFinish by frame pop.
IterativeParsingState n = src;
if (src == IterativeParsingArrayInitialState || src == IterativeParsingElementDelimiterState)
n = IterativeParsingElementState;
else if (src == IterativeParsingKeyValueDelimiterState)
n = IterativeParsingMemberValueState;
// Push current state.
*stack_.template Push<SizeType>(1) = n;
// Initialize and push the member/element count.
*stack_.template Push<SizeType>(1) = 0;
// Call handler
bool hr = (dst == IterativeParsingObjectInitialState) ? handler.StartObject() : handler.StartArray();
// On handler short circuits the parsing.
if (!hr) {
RAPIDJSON_PARSE_ERROR_NORETURN(kParseErrorTermination, is.Tell());
return IterativeParsingErrorState;
}
else {
is.Take();
return dst;
}
}
case IterativeParsingMemberKeyState:
ParseString<parseFlags>(is, handler, true);
if (HasParseError())
return IterativeParsingErrorState;
else
return dst;
case IterativeParsingKeyValueDelimiterState:
RAPIDJSON_ASSERT(token == ColonToken);
is.Take();
return dst;
case IterativeParsingMemberValueState:
// Must be non-compound value. Or it would be ObjectInitial or ArrayInitial state.
ParseValue<parseFlags>(is, handler);
if (HasParseError()) {
return IterativeParsingErrorState;
}
return dst;
case IterativeParsingElementState:
// Must be non-compound value. Or it would be ObjectInitial or ArrayInitial state.
ParseValue<parseFlags>(is, handler);
if (HasParseError()) {
return IterativeParsingErrorState;
}
return dst;
case IterativeParsingMemberDelimiterState:
case IterativeParsingElementDelimiterState:
is.Take();
// Update member/element count.
*stack_.template Top<SizeType>() = *stack_.template Top<SizeType>() + 1;
return dst;
case IterativeParsingObjectFinishState:
{
// Get member count.
SizeType c = *stack_.template Pop<SizeType>(1);
// If the object is not empty, count the last member.
if (src == IterativeParsingMemberValueState)
++c;
// Restore the state.
IterativeParsingState n = static_cast<IterativeParsingState>(*stack_.template Pop<SizeType>(1));
// Transit to Finish state if this is the topmost scope.
if (n == IterativeParsingStartState)
n = IterativeParsingFinishState;
// Call handler
bool hr = handler.EndObject(c);
// On handler short circuits the parsing.
if (!hr) {
RAPIDJSON_PARSE_ERROR_NORETURN(kParseErrorTermination, is.Tell());
return IterativeParsingErrorState;
}
else {
is.Take();
return n;
}
}
case IterativeParsingArrayFinishState:
{
// Get element count.
SizeType c = *stack_.template Pop<SizeType>(1);
// If the array is not empty, count the last element.
if (src == IterativeParsingElementState)
++c;
// Restore the state.
IterativeParsingState n = static_cast<IterativeParsingState>(*stack_.template Pop<SizeType>(1));
// Transit to Finish state if this is the topmost scope.
if (n == IterativeParsingStartState)
n = IterativeParsingFinishState;
// Call handler
bool hr = handler.EndArray(c);
// On handler short circuits the parsing.
if (!hr) {
RAPIDJSON_PARSE_ERROR_NORETURN(kParseErrorTermination, is.Tell());
return IterativeParsingErrorState;
}
else {
is.Take();
return n;
}
}
default:
// This branch is for IterativeParsingValueState actually.
// Use `default:` rather than
// `case IterativeParsingValueState:` is for code coverage.
// The IterativeParsingStartState is not enumerated in this switch-case.
// It is impossible for that case. And it can be caught by following assertion.
// The IterativeParsingFinishState is not enumerated in this switch-case either.
// It is a "derivative" state which cannot triggered from Predict() directly.
// Therefore it cannot happen here. And it can be caught by following assertion.
RAPIDJSON_ASSERT(dst == IterativeParsingValueState);
// Must be non-compound value. Or it would be ObjectInitial or ArrayInitial state.
ParseValue<parseFlags>(is, handler);
if (HasParseError()) {
return IterativeParsingErrorState;
}
return IterativeParsingFinishState;
}
}
template <typename InputStream>
void HandleError(IterativeParsingState src, InputStream& is) {
if (HasParseError()) {
// Error flag has been set.
return;
}
switch (src) {
case IterativeParsingStartState: RAPIDJSON_PARSE_ERROR(kParseErrorDocumentEmpty, is.Tell()); return;
case IterativeParsingFinishState: RAPIDJSON_PARSE_ERROR(kParseErrorDocumentRootNotSingular, is.Tell()); return;
case IterativeParsingObjectInitialState:
case IterativeParsingMemberDelimiterState: RAPIDJSON_PARSE_ERROR(kParseErrorObjectMissName, is.Tell()); return;
case IterativeParsingMemberKeyState: RAPIDJSON_PARSE_ERROR(kParseErrorObjectMissColon, is.Tell()); return;
case IterativeParsingMemberValueState: RAPIDJSON_PARSE_ERROR(kParseErrorObjectMissCommaOrCurlyBracket, is.Tell()); return;
case IterativeParsingElementState: RAPIDJSON_PARSE_ERROR(kParseErrorArrayMissCommaOrSquareBracket, is.Tell()); return;
default: RAPIDJSON_PARSE_ERROR(kParseErrorUnspecificSyntaxError, is.Tell()); return;
}
}
template <unsigned parseFlags, typename InputStream, typename Handler>
ParseResult IterativeParse(InputStream& is, Handler& handler) {
parseResult_.Clear();
ClearStackOnExit scope(*this);
IterativeParsingState state = IterativeParsingStartState;
SkipWhitespaceAndComments<parseFlags>(is);
RAPIDJSON_PARSE_ERROR_EARLY_RETURN(parseResult_);
while (is.Peek() != '\0') {
Token t = Tokenize(is.Peek());
IterativeParsingState n = Predict(state, t);
IterativeParsingState d = Transit<parseFlags>(state, t, n, is, handler);
if (d == IterativeParsingErrorState) {
HandleError(state, is);
break;
}
state = d;
// Do not further consume streams if a root JSON has been parsed.
if ((parseFlags & kParseStopWhenDoneFlag) && state == IterativeParsingFinishState)
break;
SkipWhitespaceAndComments<parseFlags>(is);
RAPIDJSON_PARSE_ERROR_EARLY_RETURN(parseResult_);
}
// Handle the end of file.
if (state != IterativeParsingFinishState)
HandleError(state, is);
return parseResult_;
}
static const size_t kDefaultStackCapacity = 256; //!< Default stack capacity in bytes for storing a single decoded string.
internal::Stack<StackAllocator> stack_; //!< A stack for storing decoded string temporarily during non-destructive parsing.
ParseResult parseResult_;
}; // class GenericReader
//! Reader with UTF8 encoding and default allocator.
typedef GenericReader<UTF8<>, UTF8<> > Reader;
RAPIDJSON_NAMESPACE_END
#ifdef __clang__
RAPIDJSON_DIAG_POP
#endif
#ifdef __GNUC__
RAPIDJSON_DIAG_POP
#endif
#ifdef _MSC_VER
RAPIDJSON_DIAG_POP
#endif
#endif // RAPIDJSON_READER_H_
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