forked from bblanchon/ArduinoJson
70 lines
1.2 KiB
C++
70 lines
1.2 KiB
C++
/*
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* malloc-free JSON parser for Arduino
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* Benoit Blanchon 2014
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* MIT License
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*/
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#ifndef __ARDUINOJSONPARSER_H
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#define __ARDUINOJSONPARSER_H
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#include <Arduino.h>
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#include "utility/jsmn.h"
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template <int N>
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class ArduinoJsonParser
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{
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public:
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ArduinoJsonParser()
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{
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jsmn_init(&parser);
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}
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boolean parse(char* jsonString)
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{
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buffer = jsonString;
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int tokenCount = sizeof(tokens) / sizeof(tokens[0]);
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if (JSMN_SUCCESS != jsmn_parse(&parser, jsonString, tokens, tokenCount))
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return false;
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// Add null termination to each token
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for (int i = 0; i < tokenCount; i++)
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{
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buffer[tokens[i].end] = 0;
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}
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return true;
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}
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char* getValue(char* name)
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{
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// Scan each keys, every two other token
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// (skip index 0, because it's the whole json object)
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for (int i = 1; i < 2 * N; i += 2)
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{
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// Early break if we reach the last token
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if (i >= parser.toknext) break;
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// Get key token string
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char* key = buffer + tokens[i].start;
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// Compare with desired name, ignoring case
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if (strcasecmp(name, key) == 0)
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{
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return buffer + tokens[i + 1].start;
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}
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}
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}
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private:
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char* buffer;
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jsmn_parser parser;
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jsmntok_t tokens[N * 2 + 1];
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};
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#endif
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