json lib
Dependents: grove_stream_jpa_sd2 grove_stream_jpa_sd2 grove_stream_jpa_sd2-2 grove_stream_jpa_sd2-3 ... more
Json.cpp
- Committer:
- faheem_chaudhary
- Date:
- 2016-08-15
- Revision:
- 5:dd98cf00ed9b
- Parent:
- 4:ae34010d87e5
- Child:
- 8:43e1e35bb7ec
File content as of revision 5:dd98cf00ed9b:
/* Json.cpp */ /* Original Author: Faheem Inayat * Created by "Night Crue" Team @ TechShop San Jose, CA * * MIT License * * Permission is hereby granted, free of charge, to any person obtaining a copy of this software * and associated documentation files (the "Software"), to deal in the Software without restriction, * including without limitation the rights to use, copy, modify, merge, publish, distribute, * sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in all copies or * substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ #include "Json.h" Json::Json ( const char * jsonString, size_t length, unsigned int maxTokens ) : maxTokenCount ( maxTokens ), source ( jsonString ), sourceLength ( length ) { jsmn_parser parser; tokens = new jsmntok_t [ maxTokenCount ]; jsmn_init ( &parser ); tokenCount = jsmn_parse ( &parser, jsonString, length, tokens, maxTokenCount ); } Json::Json ( const Json & ) : maxTokenCount ( 0 ), source ( NULL ), sourceLength ( 0 ) { tokenCount = 0; tokens = NULL; } Json::~Json () { delete [] tokens; } int Json::findKeyIndex ( const char * key, const int &startingAt ) const { int retVal = -1; int i = startingAt + 1; if ( i < 0 ) { i = 0; } for ( ; i < tokenCount; i++ ) { jsmntok_t t = tokens [ i ]; if ( t.type == JSMN_KEY ) { size_t keyLength = (size_t) ( t.end - t.start ); if ( ( strlen ( key ) == keyLength ) && ( strncmp ( source + t.start, key, keyLength ) == 0 ) ) { retVal = i; break; } } } return retVal; } int Json::findKeyIndexIn ( const char * key, const int &parentIndex ) const { int retVal = -1; if ( isValidToken ( parentIndex ) ) { for ( int i = parentIndex + 1; i < tokenCount; i++ ) { jsmntok_t t = tokens [ i ]; if ( t.end >= tokens [ parentIndex ].end ) { break; } if ( ( t.type == JSMN_KEY ) && ( t.parent == parentIndex ) ) { size_t keyLength = (size_t) ( t.end - t.start ); if ( ( strlen ( key ) == keyLength ) && ( strncmp ( source + t.start, key, keyLength ) == 0 ) ) { retVal = i; break; } } } } return retVal; } int Json::findChildIndexOf ( const int &parentIndex, const int &startingAt ) const { int retVal = -1; if ( isValidToken ( parentIndex ) ) { jsmntype_t type = tokens [ parentIndex ].type; if ( ( type == JSMN_KEY ) || ( type == JSMN_OBJECT ) || ( type == JSMN_ARRAY ) ) { int i = startingAt + 1; if ( startingAt < 0 ) { i = 0; } for ( i += parentIndex; i < tokenCount; i++ ) { if ( tokens [ i ].parent == parentIndex ) { retVal = i; break; } } } } return retVal; } bool Json::matches ( const int & tokenIndex, const char * value ) const { bool retVal = false; if ( isValidToken ( tokenIndex ) ) { jsmntok_t token = tokens [ tokenIndex ]; retVal = ( strncmp ( source + token.start, value, ( token.end - token.start ) ) == 0 ); } return retVal; } int Json::tokenIntegerValue ( const int tokenIndex, int &returnValue ) const { int retVal = -1; if ( type ( tokenIndex ) == JSMN_PRIMITIVE ) { int len = tokenLength ( tokenIndex ); char * tok = new char [ len + 1 ]; strncpy ( tok, tokenAddress ( tokenIndex ), len ); tok [ len ] = 0; returnValue = atoi ( tok ); delete [] tok; retVal = 0; } return retVal; } int Json::tokenNumberValue ( const int tokenIndex, float &returnValue ) const { int retVal = -1; if ( type ( tokenIndex ) == JSMN_PRIMITIVE ) { int len = tokenLength ( tokenIndex ); char * tok = new char [ len + 1 ]; strncpy ( tok, tokenAddress ( tokenIndex ), len ); tok [ len ] = 0; returnValue = atof ( tok ); delete [] tok; retVal = 0; } return retVal; } int Json::tokenBooleanValue ( const int tokenIndex, bool &returnValue ) const { int retVal = -1; if ( type ( tokenIndex ) == JSMN_PRIMITIVE ) { returnValue = matches ( tokenIndex, "true" ); retVal = 0; } return retVal; } char * Json::unescape ( char * jsonString ) { if ( jsonString != NULL ) { int stringIndex = 0; int indentLevel = 0; int quoteCount = 0; for ( int i = 0; jsonString [ i ] != 0; i ++ ) { switch ( jsonString [ i ] ) { case '{': indentLevel ++; break; case '}': indentLevel --; if ( indentLevel == 0 ) { // Just close and return the first valid JSON object. No need to handle complex cases. jsonString [ stringIndex ++ ] = '}'; jsonString [ stringIndex ] = 0; return jsonString; } break; case '\\': i ++; break; case '"': quoteCount ++; break; } if ( indentLevel > 0 ) { if ( quoteCount == 0 ) { return jsonString; //No need to unescape. JsonString needs to be already escaped } jsonString [ stringIndex ++ ] = jsonString [ i ]; } } jsonString [ stringIndex ] = 0; } return jsonString; }