Gerard COURIVAUD / JSON

json lib

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Json.cpp@8:43e1e35bb7ec, 2020-08-31 (annotated)

Committer:
38domo
Date:
Mon Aug 31 17:50:53 2020 +0000
Revision:
8:43e1e35bb7ec
Parent:
5:dd98cf00ed9b 
jpa json

Who changed what in which revision?

UserRevisionLine numberNew contents of line
faheem_chaudhary 5:dd98cf00ed9b 1 /* Json.cpp */
faheem_chaudhary 5:dd98cf00ed9b 2 /* Original Author: Faheem Inayat
faheem_chaudhary 5:dd98cf00ed9b 3 * Created by "Night Crue" Team @ TechShop San Jose, CA
faheem_chaudhary 5:dd98cf00ed9b 4 *
faheem_chaudhary 5:dd98cf00ed9b 5 * MIT License
faheem_chaudhary 5:dd98cf00ed9b 6 *
faheem_chaudhary 5:dd98cf00ed9b 7 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software
faheem_chaudhary 5:dd98cf00ed9b 8 * and associated documentation files (the "Software"), to deal in the Software without restriction,
faheem_chaudhary 5:dd98cf00ed9b 9 * including without limitation the rights to use, copy, modify, merge, publish, distribute,
faheem_chaudhary 5:dd98cf00ed9b 10 * sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
faheem_chaudhary 5:dd98cf00ed9b 11 * furnished to do so, subject to the following conditions:
faheem_chaudhary 5:dd98cf00ed9b 12 *
faheem_chaudhary 5:dd98cf00ed9b 13 * The above copyright notice and this permission notice shall be included in all copies or
faheem_chaudhary 5:dd98cf00ed9b 14 * substantial portions of the Software.
faheem_chaudhary 5:dd98cf00ed9b 15 *
faheem_chaudhary 5:dd98cf00ed9b 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
faheem_chaudhary 5:dd98cf00ed9b 17 * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
faheem_chaudhary 5:dd98cf00ed9b 18 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
faheem_chaudhary 5:dd98cf00ed9b 19 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
faheem_chaudhary 5:dd98cf00ed9b 20 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
faheem_chaudhary 5:dd98cf00ed9b 21 */
faheem_chaudhary 5:dd98cf00ed9b 22
mercurywaters 0:7f4a18b3fd82 23 #include "Json.h"
mercurywaters 0:7f4a18b3fd82 24
faheem_chaudhary 5:dd98cf00ed9b 25 Json::Json ( const char * jsonString, size_t length, unsigned int maxTokens )
faheem_chaudhary 5:dd98cf00ed9b 26 : maxTokenCount ( maxTokens ), source ( jsonString ), sourceLength ( length )
mercurywaters 0:7f4a18b3fd82 27 {
mercurywaters 0:7f4a18b3fd82 28 jsmn_parser parser;
faheem_chaudhary 5:dd98cf00ed9b 29 tokens = new jsmntok_t [ maxTokenCount ];
mercurywaters 3:fab591fca1e7 30
mercurywaters 0:7f4a18b3fd82 31 jsmn_init ( &parser );
faheem_chaudhary 5:dd98cf00ed9b 32 tokenCount = jsmn_parse ( &parser, jsonString, length, tokens, maxTokenCount );
mercurywaters 0:7f4a18b3fd82 33 }
mercurywaters 0:7f4a18b3fd82 34
faheem_chaudhary 5:dd98cf00ed9b 35 Json::Json ( const Json & )
faheem_chaudhary 5:dd98cf00ed9b 36 : maxTokenCount ( 0 ), source ( NULL ), sourceLength ( 0 )
mercurywaters 3:fab591fca1e7 37 {
mercurywaters 3:fab591fca1e7 38 tokenCount = 0;
mercurywaters 3:fab591fca1e7 39 tokens = NULL;
mercurywaters 3:fab591fca1e7 40 }
mercurywaters 3:fab591fca1e7 41
mercurywaters 3:fab591fca1e7 42 Json::~Json ()
mercurywaters 0:7f4a18b3fd82 43 {
mercurywaters 0:7f4a18b3fd82 44 delete [] tokens;
mercurywaters 0:7f4a18b3fd82 45 }
mercurywaters 0:7f4a18b3fd82 46
faheem_chaudhary 4:ae34010d87e5 47 int Json::findKeyIndex ( const char * key, const int &startingAt ) const
faheem_chaudhary 4:ae34010d87e5 48 {
faheem_chaudhary 4:ae34010d87e5 49 int retVal = -1;
faheem_chaudhary 4:ae34010d87e5 50
faheem_chaudhary 4:ae34010d87e5 51 int i = startingAt + 1;
faheem_chaudhary 4:ae34010d87e5 52 if ( i < 0 ) {
faheem_chaudhary 4:ae34010d87e5 53 i = 0;
faheem_chaudhary 4:ae34010d87e5 54 }
faheem_chaudhary 4:ae34010d87e5 55
faheem_chaudhary 4:ae34010d87e5 56 for ( ; i < tokenCount; i++ )
faheem_chaudhary 4:ae34010d87e5 57 {
faheem_chaudhary 4:ae34010d87e5 58 jsmntok_t t = tokens [ i ];
faheem_chaudhary 4:ae34010d87e5 59
faheem_chaudhary 4:ae34010d87e5 60 if ( t.type == JSMN_KEY )
faheem_chaudhary 4:ae34010d87e5 61 {
faheem_chaudhary 4:ae34010d87e5 62 size_t keyLength = (size_t) ( t.end - t.start );
faheem_chaudhary 4:ae34010d87e5 63 if ( ( strlen ( key ) == keyLength ) && ( strncmp ( source + t.start, key, keyLength ) == 0 ) )
faheem_chaudhary 4:ae34010d87e5 64 {
faheem_chaudhary 4:ae34010d87e5 65 retVal = i;
faheem_chaudhary 4:ae34010d87e5 66 break;
faheem_chaudhary 4:ae34010d87e5 67 }
faheem_chaudhary 4:ae34010d87e5 68 }
faheem_chaudhary 4:ae34010d87e5 69 }
faheem_chaudhary 4:ae34010d87e5 70
faheem_chaudhary 4:ae34010d87e5 71 return retVal;
faheem_chaudhary 4:ae34010d87e5 72 }
faheem_chaudhary 4:ae34010d87e5 73
mercurywaters 0:7f4a18b3fd82 74 int Json::findKeyIndexIn ( const char * key, const int &parentIndex ) const
mercurywaters 0:7f4a18b3fd82 75 {
mercurywaters 0:7f4a18b3fd82 76 int retVal = -1;
mercurywaters 3:fab591fca1e7 77
faheem_chaudhary 5:dd98cf00ed9b 78 if ( isValidToken ( parentIndex ) )
mercurywaters 3:fab591fca1e7 79 {
mercurywaters 3:fab591fca1e7 80 for ( int i = parentIndex + 1; i < tokenCount; i++ )
mercurywaters 3:fab591fca1e7 81 {
mercurywaters 0:7f4a18b3fd82 82 jsmntok_t t = tokens [ i ];
mercurywaters 3:fab591fca1e7 83
mercurywaters 3:fab591fca1e7 84 if ( t.end >= tokens [ parentIndex ].end )
mercurywaters 3:fab591fca1e7 85 {
mercurywaters 0:7f4a18b3fd82 86 break;
mercurywaters 0:7f4a18b3fd82 87 }
mercurywaters 3:fab591fca1e7 88
mercurywaters 3:fab591fca1e7 89 if ( ( t.type == JSMN_KEY ) && ( t.parent == parentIndex ) )
mercurywaters 3:fab591fca1e7 90 {
mercurywaters 3:fab591fca1e7 91 size_t keyLength = (size_t) ( t.end - t.start );
mercurywaters 3:fab591fca1e7 92 if ( ( strlen ( key ) == keyLength ) && ( strncmp ( source + t.start, key, keyLength ) == 0 ) )
mercurywaters 3:fab591fca1e7 93 {
mercurywaters 0:7f4a18b3fd82 94 retVal = i;
mercurywaters 0:7f4a18b3fd82 95 break;
mercurywaters 0:7f4a18b3fd82 96 }
mercurywaters 0:7f4a18b3fd82 97 }
mercurywaters 0:7f4a18b3fd82 98 }
mercurywaters 0:7f4a18b3fd82 99 }
mercurywaters 3:fab591fca1e7 100
mercurywaters 0:7f4a18b3fd82 101 return retVal;
mercurywaters 0:7f4a18b3fd82 102 }
mercurywaters 0:7f4a18b3fd82 103
mercurywaters 0:7f4a18b3fd82 104 int Json::findChildIndexOf ( const int &parentIndex, const int &startingAt ) const
mercurywaters 0:7f4a18b3fd82 105 {
mercurywaters 0:7f4a18b3fd82 106 int retVal = -1;
mercurywaters 3:fab591fca1e7 107
faheem_chaudhary 5:dd98cf00ed9b 108 if ( isValidToken ( parentIndex ) )
mercurywaters 3:fab591fca1e7 109 {
mercurywaters 3:fab591fca1e7 110
mercurywaters 0:7f4a18b3fd82 111 jsmntype_t type = tokens [ parentIndex ].type;
mercurywaters 3:fab591fca1e7 112 if ( ( type == JSMN_KEY ) || ( type == JSMN_OBJECT ) || ( type == JSMN_ARRAY ) )
mercurywaters 3:fab591fca1e7 113 {
mercurywaters 0:7f4a18b3fd82 114 int i = startingAt + 1;
mercurywaters 3:fab591fca1e7 115 if ( startingAt < 0 )
mercurywaters 3:fab591fca1e7 116 {
mercurywaters 0:7f4a18b3fd82 117 i = 0;
mercurywaters 0:7f4a18b3fd82 118 }
mercurywaters 3:fab591fca1e7 119
faheem_chaudhary 5:dd98cf00ed9b 120 for ( i += parentIndex; i < tokenCount; i++ )
mercurywaters 3:fab591fca1e7 121 {
mercurywaters 3:fab591fca1e7 122 if ( tokens [ i ].parent == parentIndex )
mercurywaters 3:fab591fca1e7 123 {
mercurywaters 0:7f4a18b3fd82 124 retVal = i;
mercurywaters 0:7f4a18b3fd82 125 break;
mercurywaters 0:7f4a18b3fd82 126 }
mercurywaters 0:7f4a18b3fd82 127 }
mercurywaters 0:7f4a18b3fd82 128 }
mercurywaters 0:7f4a18b3fd82 129 }
mercurywaters 3:fab591fca1e7 130
mercurywaters 0:7f4a18b3fd82 131 return retVal;
mercurywaters 0:7f4a18b3fd82 132 }
mercurywaters 0:7f4a18b3fd82 133
mercurywaters 0:7f4a18b3fd82 134 bool Json::matches ( const int & tokenIndex, const char * value ) const
mercurywaters 0:7f4a18b3fd82 135 {
faheem_chaudhary 5:dd98cf00ed9b 136 bool retVal = false;
faheem_chaudhary 5:dd98cf00ed9b 137
faheem_chaudhary 5:dd98cf00ed9b 138 if ( isValidToken ( tokenIndex ) )
faheem_chaudhary 5:dd98cf00ed9b 139 {
faheem_chaudhary 5:dd98cf00ed9b 140 jsmntok_t token = tokens [ tokenIndex ];
faheem_chaudhary 5:dd98cf00ed9b 141 retVal = ( strncmp ( source + token.start, value, ( token.end - token.start ) ) == 0 );
faheem_chaudhary 5:dd98cf00ed9b 142 }
faheem_chaudhary 5:dd98cf00ed9b 143
faheem_chaudhary 5:dd98cf00ed9b 144 return retVal;
mercurywaters 0:7f4a18b3fd82 145 }
mercurywaters 0:7f4a18b3fd82 146
faheem_chaudhary 5:dd98cf00ed9b 147 int Json::tokenIntegerValue ( const int tokenIndex, int &returnValue ) const
mercurywaters 3:fab591fca1e7 148 {
faheem_chaudhary 5:dd98cf00ed9b 149 int retVal = -1;
faheem_chaudhary 5:dd98cf00ed9b 150
mercurywaters 3:fab591fca1e7 151 if ( type ( tokenIndex ) == JSMN_PRIMITIVE )
mercurywaters 3:fab591fca1e7 152 {
mercurywaters 3:fab591fca1e7 153 int len = tokenLength ( tokenIndex );
mercurywaters 3:fab591fca1e7 154 char * tok = new char [ len + 1 ];
mercurywaters 3:fab591fca1e7 155 strncpy ( tok, tokenAddress ( tokenIndex ), len );
mercurywaters 3:fab591fca1e7 156 tok [ len ] = 0;
faheem_chaudhary 5:dd98cf00ed9b 157 returnValue = atoi ( tok );
mercurywaters 3:fab591fca1e7 158 delete [] tok;
faheem_chaudhary 5:dd98cf00ed9b 159 retVal = 0;
mercurywaters 3:fab591fca1e7 160 }
faheem_chaudhary 5:dd98cf00ed9b 161 return retVal;
mercurywaters 3:fab591fca1e7 162 }
mercurywaters 3:fab591fca1e7 163
faheem_chaudhary 5:dd98cf00ed9b 164 int Json::tokenNumberValue ( const int tokenIndex, float &returnValue ) const
faheem_chaudhary 5:dd98cf00ed9b 165 {
faheem_chaudhary 5:dd98cf00ed9b 166 int retVal = -1;
faheem_chaudhary 5:dd98cf00ed9b 167
faheem_chaudhary 5:dd98cf00ed9b 168 if ( type ( tokenIndex ) == JSMN_PRIMITIVE )
faheem_chaudhary 5:dd98cf00ed9b 169 {
faheem_chaudhary 5:dd98cf00ed9b 170 int len = tokenLength ( tokenIndex );
faheem_chaudhary 5:dd98cf00ed9b 171 char * tok = new char [ len + 1 ];
faheem_chaudhary 5:dd98cf00ed9b 172 strncpy ( tok, tokenAddress ( tokenIndex ), len );
faheem_chaudhary 5:dd98cf00ed9b 173 tok [ len ] = 0;
faheem_chaudhary 5:dd98cf00ed9b 174 returnValue = atof ( tok );
faheem_chaudhary 5:dd98cf00ed9b 175 delete [] tok;
faheem_chaudhary 5:dd98cf00ed9b 176 retVal = 0;
faheem_chaudhary 5:dd98cf00ed9b 177 }
faheem_chaudhary 5:dd98cf00ed9b 178
faheem_chaudhary 5:dd98cf00ed9b 179 return retVal;
faheem_chaudhary 5:dd98cf00ed9b 180 }
mercurywaters 3:fab591fca1e7 181
faheem_chaudhary 5:dd98cf00ed9b 182 int Json::tokenBooleanValue ( const int tokenIndex, bool &returnValue ) const
faheem_chaudhary 5:dd98cf00ed9b 183 {
faheem_chaudhary 5:dd98cf00ed9b 184 int retVal = -1;
faheem_chaudhary 5:dd98cf00ed9b 185
faheem_chaudhary 5:dd98cf00ed9b 186 if ( type ( tokenIndex ) == JSMN_PRIMITIVE )
faheem_chaudhary 5:dd98cf00ed9b 187 {
faheem_chaudhary 5:dd98cf00ed9b 188 returnValue = matches ( tokenIndex, "true" );
faheem_chaudhary 5:dd98cf00ed9b 189 retVal = 0;
faheem_chaudhary 5:dd98cf00ed9b 190 }
faheem_chaudhary 5:dd98cf00ed9b 191
faheem_chaudhary 5:dd98cf00ed9b 192 return retVal;
faheem_chaudhary 5:dd98cf00ed9b 193 }
mercurywaters 3:fab591fca1e7 194
faheem_chaudhary 4:ae34010d87e5 195 char * Json::unescape ( char * jsonString )
faheem_chaudhary 4:ae34010d87e5 196 {
faheem_chaudhary 4:ae34010d87e5 197 if ( jsonString != NULL )
faheem_chaudhary 4:ae34010d87e5 198 {
faheem_chaudhary 4:ae34010d87e5 199 int stringIndex = 0;
faheem_chaudhary 4:ae34010d87e5 200 int indentLevel = 0;
faheem_chaudhary 4:ae34010d87e5 201 int quoteCount = 0;
faheem_chaudhary 4:ae34010d87e5 202 for ( int i = 0; jsonString [ i ] != 0; i ++ )
faheem_chaudhary 4:ae34010d87e5 203 {
faheem_chaudhary 4:ae34010d87e5 204 switch ( jsonString [ i ] )
faheem_chaudhary 4:ae34010d87e5 205 {
faheem_chaudhary 4:ae34010d87e5 206 case '{':
faheem_chaudhary 4:ae34010d87e5 207 indentLevel ++;
faheem_chaudhary 4:ae34010d87e5 208 break;
faheem_chaudhary 4:ae34010d87e5 209
faheem_chaudhary 4:ae34010d87e5 210 case '}':
faheem_chaudhary 4:ae34010d87e5 211 indentLevel --;
faheem_chaudhary 4:ae34010d87e5 212 if ( indentLevel == 0 ) {
faheem_chaudhary 4:ae34010d87e5 213 // Just close and return the first valid JSON object. No need to handle complex cases.
faheem_chaudhary 4:ae34010d87e5 214 jsonString [ stringIndex ++ ] = '}';
faheem_chaudhary 4:ae34010d87e5 215 jsonString [ stringIndex ] = 0;
faheem_chaudhary 4:ae34010d87e5 216 return jsonString;
faheem_chaudhary 4:ae34010d87e5 217 }
faheem_chaudhary 4:ae34010d87e5 218 break;
faheem_chaudhary 4:ae34010d87e5 219
faheem_chaudhary 4:ae34010d87e5 220 case '\\':
faheem_chaudhary 4:ae34010d87e5 221 i ++;
faheem_chaudhary 4:ae34010d87e5 222 break;
faheem_chaudhary 4:ae34010d87e5 223
faheem_chaudhary 4:ae34010d87e5 224 case '"':
faheem_chaudhary 4:ae34010d87e5 225 quoteCount ++;
faheem_chaudhary 4:ae34010d87e5 226 break;
faheem_chaudhary 4:ae34010d87e5 227 }
faheem_chaudhary 4:ae34010d87e5 228
faheem_chaudhary 4:ae34010d87e5 229 if ( indentLevel > 0 )
faheem_chaudhary 4:ae34010d87e5 230 {
faheem_chaudhary 4:ae34010d87e5 231 if ( quoteCount == 0 ) {
faheem_chaudhary 4:ae34010d87e5 232 return jsonString; //No need to unescape. JsonString needs to be already escaped
faheem_chaudhary 4:ae34010d87e5 233 }
faheem_chaudhary 4:ae34010d87e5 234 jsonString [ stringIndex ++ ] = jsonString [ i ];
faheem_chaudhary 4:ae34010d87e5 235 }
faheem_chaudhary 4:ae34010d87e5 236 }
faheem_chaudhary 4:ae34010d87e5 237 jsonString [ stringIndex ] = 0;
faheem_chaudhary 4:ae34010d87e5 238 }
faheem_chaudhary 4:ae34010d87e5 239
faheem_chaudhary 4:ae34010d87e5 240 return jsonString;
faheem_chaudhary 4:ae34010d87e5 241 }
38domo 8:43e1e35bb7ec 242