Gerard COURIVAUD / JSON

json lib

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Json.cpp@4:ae34010d87e5, 2016-08-02 (annotated)

Committer:
faheem_chaudhary
Date:
Tue Aug 02 20:21:04 2016 +0000
Revision:
4:ae34010d87e5
Parent:
3:fab591fca1e7
Child:
5:dd98cf00ed9b
Added Key search in flat format

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mercurywaters 0:7f4a18b3fd82 1 #include "Json.h"
mercurywaters 0:7f4a18b3fd82 2
mercurywaters 0:7f4a18b3fd82 3 Json::Json ( const char * jsonString, size_t length )
mercurywaters 3:fab591fca1e7 4 : source ( jsonString ), sourceLength ( length )
mercurywaters 0:7f4a18b3fd82 5 {
mercurywaters 0:7f4a18b3fd82 6 jsmn_parser parser;
mercurywaters 3:fab591fca1e7 7 int count = 100; //jsmn_parse ( &parser, jsonString, length, NULL, 16384 );
mercurywaters 0:7f4a18b3fd82 8 tokens = new jsmntok_t [ count ];
mercurywaters 3:fab591fca1e7 9
mercurywaters 0:7f4a18b3fd82 10 jsmn_init ( &parser );
mercurywaters 0:7f4a18b3fd82 11 tokenCount = jsmn_parse ( &parser, jsonString, length, tokens, count );
mercurywaters 0:7f4a18b3fd82 12 }
mercurywaters 0:7f4a18b3fd82 13
mercurywaters 3:fab591fca1e7 14 Json::Json ( const Json & other )
mercurywaters 3:fab591fca1e7 15 : source ( NULL ), sourceLength ( 0 )
mercurywaters 3:fab591fca1e7 16 {
mercurywaters 3:fab591fca1e7 17 tokenCount = 0;
mercurywaters 3:fab591fca1e7 18 tokens = NULL;
mercurywaters 3:fab591fca1e7 19 }
mercurywaters 3:fab591fca1e7 20
mercurywaters 3:fab591fca1e7 21 Json::~Json ()
mercurywaters 0:7f4a18b3fd82 22 {
mercurywaters 0:7f4a18b3fd82 23 delete [] tokens;
mercurywaters 0:7f4a18b3fd82 24 }
mercurywaters 0:7f4a18b3fd82 25
faheem_chaudhary 4:ae34010d87e5 26 int Json::findKeyIndex ( const char * key, const int &startingAt ) const
faheem_chaudhary 4:ae34010d87e5 27 {
faheem_chaudhary 4:ae34010d87e5 28 int retVal = -1;
faheem_chaudhary 4:ae34010d87e5 29
faheem_chaudhary 4:ae34010d87e5 30 int i = startingAt + 1;
faheem_chaudhary 4:ae34010d87e5 31 if ( i < 0 ) {
faheem_chaudhary 4:ae34010d87e5 32 i = 0;
faheem_chaudhary 4:ae34010d87e5 33 }
faheem_chaudhary 4:ae34010d87e5 34
faheem_chaudhary 4:ae34010d87e5 35 for ( ; i < tokenCount; i++ )
faheem_chaudhary 4:ae34010d87e5 36 {
faheem_chaudhary 4:ae34010d87e5 37 jsmntok_t t = tokens [ i ];
faheem_chaudhary 4:ae34010d87e5 38
faheem_chaudhary 4:ae34010d87e5 39 if ( t.type == JSMN_KEY )
faheem_chaudhary 4:ae34010d87e5 40 {
faheem_chaudhary 4:ae34010d87e5 41 size_t keyLength = (size_t) ( t.end - t.start );
faheem_chaudhary 4:ae34010d87e5 42 if ( ( strlen ( key ) == keyLength ) && ( strncmp ( source + t.start, key, keyLength ) == 0 ) )
faheem_chaudhary 4:ae34010d87e5 43 {
faheem_chaudhary 4:ae34010d87e5 44 retVal = i;
faheem_chaudhary 4:ae34010d87e5 45 break;
faheem_chaudhary 4:ae34010d87e5 46 }
faheem_chaudhary 4:ae34010d87e5 47 }
faheem_chaudhary 4:ae34010d87e5 48 }
faheem_chaudhary 4:ae34010d87e5 49
faheem_chaudhary 4:ae34010d87e5 50 return retVal;
faheem_chaudhary 4:ae34010d87e5 51 }
faheem_chaudhary 4:ae34010d87e5 52
mercurywaters 0:7f4a18b3fd82 53 int Json::findKeyIndexIn ( const char * key, const int &parentIndex ) const
mercurywaters 0:7f4a18b3fd82 54 {
mercurywaters 0:7f4a18b3fd82 55 int retVal = -1;
mercurywaters 3:fab591fca1e7 56
mercurywaters 3:fab591fca1e7 57 if ( parentIndex != -1 && parentIndex < tokenCount )
mercurywaters 3:fab591fca1e7 58 {
mercurywaters 3:fab591fca1e7 59
mercurywaters 3:fab591fca1e7 60 for ( int i = parentIndex + 1; i < tokenCount; i++ )
mercurywaters 3:fab591fca1e7 61 {
mercurywaters 3:fab591fca1e7 62
mercurywaters 0:7f4a18b3fd82 63 jsmntok_t t = tokens [ i ];
mercurywaters 3:fab591fca1e7 64
mercurywaters 3:fab591fca1e7 65 if ( t.end >= tokens [ parentIndex ].end )
mercurywaters 3:fab591fca1e7 66 {
mercurywaters 0:7f4a18b3fd82 67 break;
mercurywaters 0:7f4a18b3fd82 68 }
mercurywaters 3:fab591fca1e7 69
mercurywaters 3:fab591fca1e7 70 if ( ( t.type == JSMN_KEY ) && ( t.parent == parentIndex ) )
mercurywaters 3:fab591fca1e7 71 {
mercurywaters 3:fab591fca1e7 72 size_t keyLength = (size_t) ( t.end - t.start );
mercurywaters 3:fab591fca1e7 73 if ( ( strlen ( key ) == keyLength ) && ( strncmp ( source + t.start, key, keyLength ) == 0 ) )
mercurywaters 3:fab591fca1e7 74 {
mercurywaters 0:7f4a18b3fd82 75 retVal = i;
mercurywaters 0:7f4a18b3fd82 76 break;
mercurywaters 0:7f4a18b3fd82 77 }
mercurywaters 0:7f4a18b3fd82 78 }
mercurywaters 0:7f4a18b3fd82 79 }
mercurywaters 0:7f4a18b3fd82 80 }
mercurywaters 3:fab591fca1e7 81
mercurywaters 0:7f4a18b3fd82 82 return retVal;
mercurywaters 0:7f4a18b3fd82 83 }
mercurywaters 0:7f4a18b3fd82 84
mercurywaters 0:7f4a18b3fd82 85 int Json::findChildIndexOf ( const int &parentIndex, const int &startingAt ) const
mercurywaters 0:7f4a18b3fd82 86 {
mercurywaters 0:7f4a18b3fd82 87 int retVal = -1;
mercurywaters 3:fab591fca1e7 88
mercurywaters 3:fab591fca1e7 89 if ( parentIndex != -1 && parentIndex < tokenCount )
mercurywaters 3:fab591fca1e7 90 {
mercurywaters 3:fab591fca1e7 91
mercurywaters 0:7f4a18b3fd82 92 jsmntype_t type = tokens [ parentIndex ].type;
mercurywaters 3:fab591fca1e7 93 if ( ( type == JSMN_KEY ) || ( type == JSMN_OBJECT ) || ( type == JSMN_ARRAY ) )
mercurywaters 3:fab591fca1e7 94 {
mercurywaters 0:7f4a18b3fd82 95 int i = startingAt + 1;
mercurywaters 3:fab591fca1e7 96 if ( startingAt < 0 )
mercurywaters 3:fab591fca1e7 97 {
mercurywaters 0:7f4a18b3fd82 98 i = 0;
mercurywaters 0:7f4a18b3fd82 99 }
mercurywaters 3:fab591fca1e7 100
mercurywaters 3:fab591fca1e7 101 for ( ; i < tokenCount; i++ )
mercurywaters 3:fab591fca1e7 102 {
mercurywaters 3:fab591fca1e7 103 if ( tokens [ i ].parent == parentIndex )
mercurywaters 3:fab591fca1e7 104 {
mercurywaters 0:7f4a18b3fd82 105 retVal = i;
mercurywaters 0:7f4a18b3fd82 106 break;
mercurywaters 0:7f4a18b3fd82 107 }
mercurywaters 0:7f4a18b3fd82 108 }
mercurywaters 0:7f4a18b3fd82 109 }
mercurywaters 0:7f4a18b3fd82 110 }
mercurywaters 3:fab591fca1e7 111
mercurywaters 0:7f4a18b3fd82 112 return retVal;
mercurywaters 0:7f4a18b3fd82 113 }
mercurywaters 0:7f4a18b3fd82 114
mercurywaters 0:7f4a18b3fd82 115 bool Json::matches ( const int & tokenIndex, const char * value ) const
mercurywaters 0:7f4a18b3fd82 116 {
mercurywaters 0:7f4a18b3fd82 117 jsmntok_t token = tokens [ tokenIndex ];
mercurywaters 0:7f4a18b3fd82 118 return ( strncmp ( source + token.start, value, ( token.end - token.start ) ) == 0 );
mercurywaters 0:7f4a18b3fd82 119 }
mercurywaters 0:7f4a18b3fd82 120
mercurywaters 3:fab591fca1e7 121 int Json::tokenIntegerValue ( const int tokenIndex ) const
mercurywaters 3:fab591fca1e7 122 {
mercurywaters 3:fab591fca1e7 123 if ( type ( tokenIndex ) == JSMN_PRIMITIVE )
mercurywaters 3:fab591fca1e7 124 {
mercurywaters 3:fab591fca1e7 125 int len = tokenLength ( tokenIndex );
mercurywaters 3:fab591fca1e7 126 char * tok = new char [ len + 1 ];
mercurywaters 3:fab591fca1e7 127 strncpy ( tok, tokenAddress ( tokenIndex ), len );
mercurywaters 3:fab591fca1e7 128 tok [ len ] = 0;
mercurywaters 3:fab591fca1e7 129 int retVal = atoi ( tok );
mercurywaters 3:fab591fca1e7 130 delete [] tok;
mercurywaters 3:fab591fca1e7 131 return retVal;
mercurywaters 3:fab591fca1e7 132 }
mercurywaters 3:fab591fca1e7 133 return -1;
mercurywaters 3:fab591fca1e7 134 }
mercurywaters 3:fab591fca1e7 135
mercurywaters 3:fab591fca1e7 136 float Json::tokenNumberValue ( const int tokenIndex ) const
mercurywaters 0:7f4a18b3fd82 137 {
mercurywaters 3:fab591fca1e7 138 if ( type ( tokenIndex ) == JSMN_PRIMITIVE )
mercurywaters 3:fab591fca1e7 139 {
mercurywaters 3:fab591fca1e7 140 int len = tokenLength ( tokenIndex );
mercurywaters 3:fab591fca1e7 141 char * tok = new char [ len + 1 ];
mercurywaters 3:fab591fca1e7 142 strncpy ( tok, tokenAddress ( tokenIndex ), len );
mercurywaters 3:fab591fca1e7 143 tok [ len ] = 0;
mercurywaters 3:fab591fca1e7 144 float retVal = atof ( tok );
mercurywaters 3:fab591fca1e7 145 delete [] tok;
mercurywaters 3:fab591fca1e7 146 return retVal;
mercurywaters 3:fab591fca1e7 147 }
mercurywaters 3:fab591fca1e7 148 return -1;
mercurywaters 3:fab591fca1e7 149 }
mercurywaters 3:fab591fca1e7 150
mercurywaters 3:fab591fca1e7 151
mercurywaters 3:fab591fca1e7 152 // void Json::print () const
mercurywaters 3:fab591fca1e7 153 // {
mercurywaters 3:fab591fca1e7 154 // #ifdef SOFTWARE_DEBUG
mercurywaters 3:fab591fca1e7 155 // const char * TYPES [] = {
mercurywaters 3:fab591fca1e7 156 // "UNDEFINED",
mercurywaters 3:fab591fca1e7 157 // "OBJECT ",
mercurywaters 3:fab591fca1e7 158 // "ARRAY ",
mercurywaters 3:fab591fca1e7 159 // "STRING ",
mercurywaters 3:fab591fca1e7 160 // "PRIMITIVE",
mercurywaters 3:fab591fca1e7 161 // "KEY "
mercurywaters 3:fab591fca1e7 162 // };
mercurywaters 3:fab591fca1e7 163 //
mercurywaters 3:fab591fca1e7 164 // for ( int i = 0; i < tokenCount; i ++ ) {
mercurywaters 3:fab591fca1e7 165 // debug ( "Index: %3d, Type:%d(%s), Indices: (%3d to %3d), ParentIndex: %3d, ChildCount: %3d Data: %.*s", i, tokens [ i ].type, TYPES [ tokens [ i ].type ], tokens [ i ].start, tokens [ i ].end, tokens [ i ].parent, tokens [ i ].childCount, tokens [ i ].end - tokens [ i ].start, source + tokens [ i ].start );
mercurywaters 3:fab591fca1e7 166 // }
mercurywaters 3:fab591fca1e7 167 // debug ( "" );
mercurywaters 3:fab591fca1e7 168 // #endif
mercurywaters 3:fab591fca1e7 169 // }
mercurywaters 3:fab591fca1e7 170
faheem_chaudhary 4:ae34010d87e5 171 char * Json::unescape ( char * jsonString )
faheem_chaudhary 4:ae34010d87e5 172 {
faheem_chaudhary 4:ae34010d87e5 173 if ( jsonString != NULL )
faheem_chaudhary 4:ae34010d87e5 174 {
faheem_chaudhary 4:ae34010d87e5 175 int stringIndex = 0;
faheem_chaudhary 4:ae34010d87e5 176 int indentLevel = 0;
faheem_chaudhary 4:ae34010d87e5 177 int quoteCount = 0;
faheem_chaudhary 4:ae34010d87e5 178 for ( int i = 0; jsonString [ i ] != 0; i ++ )
faheem_chaudhary 4:ae34010d87e5 179 {
faheem_chaudhary 4:ae34010d87e5 180 switch ( jsonString [ i ] )
faheem_chaudhary 4:ae34010d87e5 181 {
faheem_chaudhary 4:ae34010d87e5 182 case '{':
faheem_chaudhary 4:ae34010d87e5 183 indentLevel ++;
faheem_chaudhary 4:ae34010d87e5 184 break;
faheem_chaudhary 4:ae34010d87e5 185
faheem_chaudhary 4:ae34010d87e5 186 case '}':
faheem_chaudhary 4:ae34010d87e5 187 indentLevel --;
faheem_chaudhary 4:ae34010d87e5 188 if ( indentLevel == 0 ) {
faheem_chaudhary 4:ae34010d87e5 189 // Just close and return the first valid JSON object. No need to handle complex cases.
faheem_chaudhary 4:ae34010d87e5 190 jsonString [ stringIndex ++ ] = '}';
faheem_chaudhary 4:ae34010d87e5 191 jsonString [ stringIndex ] = 0;
faheem_chaudhary 4:ae34010d87e5 192 return jsonString;
faheem_chaudhary 4:ae34010d87e5 193 }
faheem_chaudhary 4:ae34010d87e5 194 break;
faheem_chaudhary 4:ae34010d87e5 195
faheem_chaudhary 4:ae34010d87e5 196 case '\\':
faheem_chaudhary 4:ae34010d87e5 197 i ++;
faheem_chaudhary 4:ae34010d87e5 198 break;
faheem_chaudhary 4:ae34010d87e5 199
faheem_chaudhary 4:ae34010d87e5 200 case '"':
faheem_chaudhary 4:ae34010d87e5 201 quoteCount ++;
faheem_chaudhary 4:ae34010d87e5 202 break;
faheem_chaudhary 4:ae34010d87e5 203 }
faheem_chaudhary 4:ae34010d87e5 204
faheem_chaudhary 4:ae34010d87e5 205 if ( indentLevel > 0 )
faheem_chaudhary 4:ae34010d87e5 206 {
faheem_chaudhary 4:ae34010d87e5 207 if ( quoteCount == 0 ) {
faheem_chaudhary 4:ae34010d87e5 208 return jsonString; //No need to unescape. JsonString needs to be already escaped
faheem_chaudhary 4:ae34010d87e5 209 }
faheem_chaudhary 4:ae34010d87e5 210 jsonString [ stringIndex ++ ] = jsonString [ i ];
faheem_chaudhary 4:ae34010d87e5 211 }
faheem_chaudhary 4:ae34010d87e5 212 }
faheem_chaudhary 4:ae34010d87e5 213 jsonString [ stringIndex ] = 0;
faheem_chaudhary 4:ae34010d87e5 214 }
faheem_chaudhary 4:ae34010d87e5 215
faheem_chaudhary 4:ae34010d87e5 216 return jsonString;
faheem_chaudhary 4:ae34010d87e5 217 }