500 lines
14 KiB
C++
500 lines
14 KiB
C++
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/*
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* JSONPreparse.cpp
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* TestSuite
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*
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* Created by Wallace on 4/13/11.
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* Copyright 2011 Streamwide. All rights reserved.
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*
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*/
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#include "JSONPreparse.h"
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#if (defined(JSON_PREPARSE) && defined(JSON_READ_PRIORITY))
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#ifdef JSON_COMMENTS
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json_string extractComment(json_string::const_iterator & ptr, json_string::const_iterator & end);
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json_string extractComment(json_string::const_iterator & ptr, json_string::const_iterator & end){
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json_string::const_iterator start;
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json_string result;
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looplabel:
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if (json_unlikely(((ptr != end) && (*ptr == JSON_TEMP_COMMENT_IDENTIFIER)))){
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start = ++ptr;
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for(; (ptr != end) && (*(ptr) != JSON_TEMP_COMMENT_IDENTIFIER); ++ptr){}
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result += json_string(start, ptr);
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if (json_unlikely(ptr == end)) return result;
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++ptr;
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if (json_unlikely(((ptr != end) && (*ptr == JSON_TEMP_COMMENT_IDENTIFIER)))){
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result += JSON_TEXT('\n');
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goto looplabel;
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}
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}
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return result;
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}
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#define GET_COMMENT(x, y, name) json_string name = extractComment(x, y)
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#define RETURN_NODE(node, name){\
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JSONNode res = node;\
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res.set_comment(name);\
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return res;\
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}
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#define RETURN_NODE_NOCOPY(node, name){\
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node.set_comment(name);\
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return node;\
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}
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#define SET_COMMENT(node, name) node.set_comment(name)
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#define COMMENT_ARG(name) ,name
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#else
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#define GET_COMMENT(x, y, name) (void)0
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#define RETURN_NODE(node, name) return node
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#define RETURN_NODE_NOCOPY(node, name) return node
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#define SET_COMMENT(node, name) (void)0
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#define COMMENT_ARG(name)
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#endif
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inline bool isHex(json_char c) json_pure;
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inline bool isHex(json_char c) json_nothrow {
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return (((c >= JSON_TEXT('0')) && (c <= JSON_TEXT('9'))) ||
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((c >= JSON_TEXT('A')) && (c <= JSON_TEXT('F'))) ||
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((c >= JSON_TEXT('a')) && (c <= JSON_TEXT('f'))));
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}
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#ifdef JSON_STRICT
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#include "NumberToString.h"
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#endif
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json_number FetchNumber(const json_string & _string) json_nothrow;
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json_number FetchNumber(const json_string & _string) json_nothrow {
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#ifdef JSON_STRICT
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return NumberToString::_atof(_string.c_str());
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#else
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#ifdef JSON_UNICODE
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const size_t len = _string.length();
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#if defined(_MSC_VER) && defined(JSON_SAFE)
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const size_t bytes = (len * (sizeof(json_char) / sizeof(char))) + 1;
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json_auto<char> temp(bytes);
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size_t res;
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errno_t err = std::wcstombs_s(&res, temp.ptr, bytes, _string.c_str(), len);
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if (err != 0){
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return (json_number)0.0;
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}
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#elif defined(JSON_SAFE)
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const size_t bytes = (len * (sizeof(json_char) / sizeof(char))) + 1;
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json_auto<char> temp(bytes);
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size_t res = std::wcstombs(temp.ptr, _string.c_str(), len);
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if (res == (size_t)-1){ //-1 is error code for this function
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return (json_number)0.0;
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}
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#else
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json_auto<char> temp(len + 1);
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size_t res = std::wcstombs(temp.ptr, _string.c_str(), len);
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#endif
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temp.ptr[res] = JSON_TEXT('\0');
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return (json_number)std::atof(temp.ptr);
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#else
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return (json_number)std::atof(_string.c_str());
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#endif
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#endif
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}
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JSONNode JSONPreparse::isValidNumber(json_string::const_iterator & ptr, json_string::const_iterator & end){
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//ptr points at the first character in the number
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//ptr will end up past the last character
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json_string::const_iterator start = ptr;
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bool decimal = false;
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bool scientific = false;
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//first letter is weird
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switch(*ptr){
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#ifndef JSON_STRICT
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case JSON_TEXT('.'):
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decimal = true;
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break;
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case JSON_TEXT('+'):
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#endif
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case JSON_TEXT('-'):
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case JSON_TEXT('1'):
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case JSON_TEXT('2'):
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case JSON_TEXT('3'):
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case JSON_TEXT('4'):
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case JSON_TEXT('5'):
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case JSON_TEXT('6'):
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case JSON_TEXT('7'):
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case JSON_TEXT('8'):
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case JSON_TEXT('9'):
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break;
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case JSON_TEXT('0'):
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++ptr;
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switch(*ptr){
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case JSON_TEXT('.'):
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decimal = true;
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break;
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case JSON_TEXT('e'):
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case JSON_TEXT('E'):
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scientific = true;
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++ptr;
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if (ptr == end) throw false;
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switch(*ptr){
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case JSON_TEXT('-'):
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case JSON_TEXT('+'):
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case JSON_TEXT('0'):
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case JSON_TEXT('1'):
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case JSON_TEXT('2'):
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case JSON_TEXT('3'):
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case JSON_TEXT('4'):
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case JSON_TEXT('5'):
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case JSON_TEXT('6'):
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case JSON_TEXT('7'):
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case JSON_TEXT('8'):
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case JSON_TEXT('9'):
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break;
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default:
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throw false;
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}
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break;
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#ifndef JSON_STRICT
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case JSON_TEXT('x'):
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while(isHex(*++ptr)){};
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return JSONNode(json_global(EMPTY_JSON_STRING), FetchNumber(json_string(start, end - 1)));
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#ifdef JSON_OCTAL
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#ifdef __GNUC__
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case JSON_TEXT('0') ... JSON_TEXT('7'): //octal
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#else
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case JSON_TEXT('0'):
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case JSON_TEXT('1'):
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case JSON_TEXT('2'):
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case JSON_TEXT('3'):
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case JSON_TEXT('4'):
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case JSON_TEXT('5'):
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case JSON_TEXT('6'):
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case JSON_TEXT('7'):
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#endif
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while((*++ptr >= JSON_TEXT('0')) && (*ptr <= JSON_TEXT('7'))){};
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if ((*ptr != JSON_TEXT('8')) && (*ptr != JSON_TEXT('9'))){
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return JSONNode(json_global(EMPTY_JSON_STRING), FetchNumber(json_string(start, ptr - 1)));
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}
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throw false;
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case JSON_TEXT('8'):
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case JSON_TEXT('9'):
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break;
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#else
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#ifdef __GNUC__
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case JSON_TEXT('0') ... JSON_TEXT('9'):
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#else
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case JSON_TEXT('0'):
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case JSON_TEXT('1'):
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case JSON_TEXT('2'):
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case JSON_TEXT('3'):
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case JSON_TEXT('4'):
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case JSON_TEXT('5'):
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case JSON_TEXT('6'):
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case JSON_TEXT('7'):
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case JSON_TEXT('8'):
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case JSON_TEXT('9'):
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#endif
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break;
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#endif
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#else
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#ifdef __GNUC__
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case JSON_TEXT('0') ... JSON_TEXT('9'):
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#else
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case JSON_TEXT('0'):
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case JSON_TEXT('1'):
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case JSON_TEXT('2'):
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case JSON_TEXT('3'):
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case JSON_TEXT('4'):
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case JSON_TEXT('5'):
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case JSON_TEXT('6'):
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case JSON_TEXT('7'):
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case JSON_TEXT('8'):
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case JSON_TEXT('9'):
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#endif
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break;
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#endif
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default: //just a 0
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return JSONNode(json_global(EMPTY_JSON_STRING), FetchNumber(json_string(start, ptr - 1)));;
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}
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break;
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default:
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throw false;
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}
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++ptr;
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//next digits
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while (true){
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switch(*ptr){
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case JSON_TEXT('.'):
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if (json_unlikely(decimal)) throw false; //multiple decimals
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if (json_unlikely(scientific)) throw false;
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decimal = true;
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break;
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case JSON_TEXT('e'):
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case JSON_TEXT('E'):
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if (json_likely(scientific)) throw false;
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scientific = true;
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++ptr;
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switch(*ptr){
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case JSON_TEXT('-'):
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case JSON_TEXT('+'):
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#ifdef __GNUC__
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case JSON_TEXT('0') ... JSON_TEXT('9'):
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#else
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case JSON_TEXT('0'):
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case JSON_TEXT('1'):
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case JSON_TEXT('2'):
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case JSON_TEXT('3'):
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case JSON_TEXT('4'):
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case JSON_TEXT('5'):
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case JSON_TEXT('6'):
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case JSON_TEXT('7'):
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case JSON_TEXT('8'):
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case JSON_TEXT('9'):
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#endif
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break;
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default:
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throw false;
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}
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break;
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#ifdef __GNUC__
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case JSON_TEXT('0') ... JSON_TEXT('9'):
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#else
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case JSON_TEXT('0'):
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case JSON_TEXT('1'):
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case JSON_TEXT('2'):
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case JSON_TEXT('3'):
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case JSON_TEXT('4'):
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case JSON_TEXT('5'):
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case JSON_TEXT('6'):
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case JSON_TEXT('7'):
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case JSON_TEXT('8'):
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case JSON_TEXT('9'):
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#endif
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break;
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default:
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return JSONNode(json_global(EMPTY_JSON_STRING), FetchNumber(json_string(start, ptr)));;
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}
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++ptr;
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}
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throw false;
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}
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#ifndef JSON_STRICT
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#define LETTERCASE(x, y)\
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case JSON_TEXT(x):\
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case JSON_TEXT(y)
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#define LETTERCHECK(x, y)\
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if (json_unlikely((*++ptr != JSON_TEXT(x)) && (*ptr != JSON_TEXT(y)))) throw false
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#else
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#define LETTERCASE(x, y)\
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case JSON_TEXT(x)
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#define LETTERCHECK(x, y)\
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if (json_unlikely(*++ptr != JSON_TEXT(x))) throw false
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#endif
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JSONNode JSONPreparse::isValidMember(json_string::const_iterator & ptr, json_string::const_iterator & end){
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//ptr is on the first character of the member
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//ptr will end up immediately after the last character in the member
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if (ptr == end) throw false;
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switch(*ptr){
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case JSON_TEXT('\"'):{
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return JSONNode::stringType(isValidString(++ptr, end));
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}
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case JSON_TEXT('{'):
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return isValidObject(++ptr, end);
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case JSON_TEXT('['):
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return isValidArray(++ptr, end);
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LETTERCASE('t', 'T'):
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LETTERCHECK('r', 'R');
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LETTERCHECK('u', 'U');
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LETTERCHECK('e', 'E');
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++ptr;
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return JSONNode(json_global(EMPTY_JSON_STRING), true);
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LETTERCASE('f', 'F'):
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LETTERCHECK('a', 'A');
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LETTERCHECK('l', 'L');
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LETTERCHECK('s', 'S');
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LETTERCHECK('e', 'E');
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++ptr;
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return JSONNode(json_global(EMPTY_JSON_STRING), false);
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LETTERCASE('n', 'N'):
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LETTERCHECK('u', 'U');
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LETTERCHECK('l', 'L');
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LETTERCHECK('l', 'L');
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++ptr;
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return JSONNode(JSON_NULL);
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#ifndef JSON_STRICT
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case JSON_TEXT('}'): //null in libjson
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case JSON_TEXT(']'): //null in libjson
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case JSON_TEXT(','): //null in libjson
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return JSONNode(JSON_NULL);
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#endif
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}
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//a number
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return isValidNumber(ptr, end);
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}
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json_string JSONPreparse::isValidString(json_string::const_iterator & ptr, json_string::const_iterator & end){
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//ptr is pointing to the first character after the quote
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//ptr will end up behind the closing "
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json_string::const_iterator start = ptr;
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while(ptr != end){
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switch(*ptr){
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case JSON_TEXT('\\'):
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switch(*(++ptr)){
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case JSON_TEXT('\"'):
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case JSON_TEXT('\\'):
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case JSON_TEXT('/'):
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case JSON_TEXT('b'):
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case JSON_TEXT('f'):
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case JSON_TEXT('n'):
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case JSON_TEXT('r'):
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case JSON_TEXT('t'):
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break;
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case JSON_TEXT('u'):
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if (json_unlikely(!isHex(*++ptr))) throw false;
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if (json_unlikely(!isHex(*++ptr))) throw false;
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//fallthrough to \x
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#ifndef JSON_STRICT
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case JSON_TEXT('x'): //hex
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#endif
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if (json_unlikely(!isHex(*++ptr))) throw false;
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if (json_unlikely(!isHex(*++ptr))) throw false;
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break;
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#ifndef JSON_OCTAL
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#ifdef __GNUC__
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case JSON_TEXT('0') ... JSON_TEXT('7'): //octal
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#else
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case JSON_TEXT('0'):
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case JSON_TEXT('1'):
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case JSON_TEXT('2'):
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case JSON_TEXT('3'):
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case JSON_TEXT('4'):
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case JSON_TEXT('5'):
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case JSON_TEXT('6'):
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case JSON_TEXT('7'):
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#endif
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||
|
|
if (json_unlikely((*++ptr < JSON_TEXT('0')) || (*ptr > JSON_TEXT('7')))) throw false;
|
||
|
|
if (json_unlikely((*++ptr < JSON_TEXT('0')) || (*ptr > JSON_TEXT('7')))) throw false;
|
||
|
|
break;
|
||
|
|
#endif
|
||
|
|
default:
|
||
|
|
throw false;
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
case JSON_TEXT('\"'):
|
||
|
|
return json_string(start, ptr++);
|
||
|
|
}
|
||
|
|
++ptr;
|
||
|
|
}
|
||
|
|
throw false;
|
||
|
|
}
|
||
|
|
|
||
|
|
void JSONPreparse::isValidNamedObject(json_string::const_iterator & ptr, json_string::const_iterator & end, JSONNode & parent COMMENT_PARAM(comment)) {
|
||
|
|
//ptr should be right before the string name
|
||
|
|
{
|
||
|
|
json_string _name = isValidString(++ptr, end);
|
||
|
|
if (json_unlikely(*ptr++ != JSON_TEXT(':'))) throw false;
|
||
|
|
JSONNode res = isValidMember(ptr, end);
|
||
|
|
res.set_name_(_name);
|
||
|
|
SET_COMMENT(res, comment);
|
||
|
|
#ifdef JSON_LIBRARY
|
||
|
|
parent.push_back(&res);
|
||
|
|
#else
|
||
|
|
parent.push_back(res);
|
||
|
|
#endif
|
||
|
|
}
|
||
|
|
if (ptr == end) throw false;
|
||
|
|
switch(*ptr){
|
||
|
|
case JSON_TEXT(','):
|
||
|
|
++ptr;
|
||
|
|
{
|
||
|
|
GET_COMMENT(ptr, end, nextcomment);
|
||
|
|
isValidNamedObject(ptr, end, parent COMMENT_ARG(nextcomment)); //will handle all of them
|
||
|
|
}
|
||
|
|
return;
|
||
|
|
case JSON_TEXT('}'):
|
||
|
|
++ptr;
|
||
|
|
return;
|
||
|
|
default:
|
||
|
|
throw false;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
JSONNode JSONPreparse::isValidObject(json_string::const_iterator & ptr, json_string::const_iterator & end) {
|
||
|
|
//ptr should currently be pointing past the {, so this must be the start of a name, or the closing }
|
||
|
|
//ptr will end up past the last }
|
||
|
|
JSONNode res(JSON_NODE);
|
||
|
|
GET_COMMENT(ptr, end, comment);
|
||
|
|
switch(*ptr){
|
||
|
|
case JSON_TEXT('\"'):
|
||
|
|
isValidNamedObject(ptr, end, res COMMENT_ARG(comment));
|
||
|
|
return res;
|
||
|
|
case JSON_TEXT('}'):
|
||
|
|
++ptr;
|
||
|
|
return res;
|
||
|
|
default:
|
||
|
|
throw false;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
void pushArrayMember(JSONNode & res, json_string::const_iterator & ptr, json_string::const_iterator & end);
|
||
|
|
void pushArrayMember(JSONNode & res, json_string::const_iterator & ptr, json_string::const_iterator & end){
|
||
|
|
GET_COMMENT(ptr, end, comment);
|
||
|
|
JSONNode temp = JSONPreparse::isValidMember(ptr, end);
|
||
|
|
SET_COMMENT(temp, comment);
|
||
|
|
#ifdef JSON_LIBRARY
|
||
|
|
res.push_back(&temp);
|
||
|
|
#else
|
||
|
|
res.push_back(temp);
|
||
|
|
#endif
|
||
|
|
}
|
||
|
|
|
||
|
|
JSONNode JSONPreparse::isValidArray(json_string::const_iterator & ptr, json_string::const_iterator & end) {
|
||
|
|
//ptr should currently be pointing past the [, so this must be the start of a member, or the closing ]
|
||
|
|
//ptr will end up past the last ]
|
||
|
|
JSONNode res(JSON_ARRAY);
|
||
|
|
do{
|
||
|
|
switch(*ptr){
|
||
|
|
case JSON_TEXT(']'):
|
||
|
|
++ptr;
|
||
|
|
return res;
|
||
|
|
default:
|
||
|
|
pushArrayMember(res, ptr, end);
|
||
|
|
switch(*ptr){
|
||
|
|
case JSON_TEXT(','):
|
||
|
|
break;
|
||
|
|
case JSON_TEXT(']'):
|
||
|
|
++ptr;
|
||
|
|
return res;
|
||
|
|
default:
|
||
|
|
throw false;
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
} while (++ptr != end);
|
||
|
|
throw false;
|
||
|
|
}
|
||
|
|
|
||
|
|
JSONNode JSONPreparse::isValidRoot(const json_string & json) json_throws(std::invalid_argument) {
|
||
|
|
json_string::const_iterator it = json.begin();
|
||
|
|
json_string::const_iterator end = json.end();
|
||
|
|
try {
|
||
|
|
GET_COMMENT(it, end, comment);
|
||
|
|
switch(*it){
|
||
|
|
case JSON_TEXT('{'):
|
||
|
|
RETURN_NODE(isValidObject(++it, end), comment);
|
||
|
|
case JSON_TEXT('['):
|
||
|
|
RETURN_NODE(isValidArray(++it, end), comment);
|
||
|
|
}
|
||
|
|
} catch (...){}
|
||
|
|
|
||
|
|
#ifndef JSON_NO_EXCEPTIONS
|
||
|
|
throw std::invalid_argument(json_global(EMPTY_STD_STRING));
|
||
|
|
#else
|
||
|
|
return JSONNode(JSON_NULL);
|
||
|
|
#endif
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif
|