Vergil Cola / Mbed OS MQTTGatewayK64

Fork of my MQTTGateway

Dependencies:   mbed-http

jsmn/WeatherInfo.cpp@0:f1d3878b8dd9, 2017-04-08 (annotated)

Committer:
vpcola
Date:
Sat Apr 08 14:45:51 2017 +0000
Revision:
0:f1d3878b8dd9
Initial commit

Who changed what in which revision?

UserRevisionLine numberNew contents of line
vpcola 0:f1d3878b8dd9 1 #include "WeatherInfo.h"
vpcola 0:f1d3878b8dd9 2 #include <string.h>
vpcola 0:f1d3878b8dd9 3 #include <stdlib.h>
vpcola 0:f1d3878b8dd9 4
vpcola 0:f1d3878b8dd9 5 static int jsoneq(const char * json, jsmntok_t * tok, const char * s)
vpcola 0:f1d3878b8dd9 6 {
vpcola 0:f1d3878b8dd9 7 if (tok->type == JSMN_STRING && (int) strlen(s) == tok->end - tok->start &&
vpcola 0:f1d3878b8dd9 8 strncmp(json + tok->start, s, tok->end - tok->start) == 0) {
vpcola 0:f1d3878b8dd9 9 return 0;
vpcola 0:f1d3878b8dd9 10 }
vpcola 0:f1d3878b8dd9 11 return -1;
vpcola 0:f1d3878b8dd9 12 }
vpcola 0:f1d3878b8dd9 13
vpcola 0:f1d3878b8dd9 14 int parseweatherinfo(const char * weather, WeatherInfo & winfo)
vpcola 0:f1d3878b8dd9 15 {
vpcola 0:f1d3878b8dd9 16 // Parse weather information
vpcola 0:f1d3878b8dd9 17 jsmn_parser p;
vpcola 0:f1d3878b8dd9 18 jsmntok_t t[128];
vpcola 0:f1d3878b8dd9 19
vpcola 0:f1d3878b8dd9 20 jsmn_init(&p);
vpcola 0:f1d3878b8dd9 21 int r = jsmn_parse(&p, weather, strlen(weather), t, sizeof(t)/sizeof(t[0]));
vpcola 0:f1d3878b8dd9 22 // Top level must be an object
vpcola 0:f1d3878b8dd9 23 if ((r > 0) && (t[0].type == JSMN_OBJECT))
vpcola 0:f1d3878b8dd9 24 {
vpcola 0:f1d3878b8dd9 25 /* Loop over all keys of the root object */
vpcola 0:f1d3878b8dd9 26 for (int i = 1; i < r; i++)
vpcola 0:f1d3878b8dd9 27 {
vpcola 0:f1d3878b8dd9 28 if (jsoneq(weather, &t[i], "description") == 0)
vpcola 0:f1d3878b8dd9 29 {
vpcola 0:f1d3878b8dd9 30 winfo.weather = std::string((const char *)(weather + t[i+1].start), (size_t) t[i+1].end - t[i+1].start);
vpcola 0:f1d3878b8dd9 31 i++;
vpcola 0:f1d3878b8dd9 32 }
vpcola 0:f1d3878b8dd9 33 else if (jsoneq(weather, &t[i], "icon") == 0)
vpcola 0:f1d3878b8dd9 34 {
vpcola 0:f1d3878b8dd9 35 winfo.icon = std::string((const char *)(weather + t[i+1].start), (size_t) t[i+1].end - t[i+1].start);
vpcola 0:f1d3878b8dd9 36 i++;
vpcola 0:f1d3878b8dd9 37 }
vpcola 0:f1d3878b8dd9 38 else if (jsoneq(weather, &t[i], "temp") == 0)
vpcola 0:f1d3878b8dd9 39 {
vpcola 0:f1d3878b8dd9 40 std::string tempstr((const char *)(weather + t[i+1].start), (size_t) t[i+1].end - t[i+1].start);
vpcola 0:f1d3878b8dd9 41 winfo.temperature = strtod(tempstr.c_str(), NULL);
vpcola 0:f1d3878b8dd9 42 i++;
vpcola 0:f1d3878b8dd9 43 }
vpcola 0:f1d3878b8dd9 44 else if (jsoneq(weather, &t[i], "humidity") == 0)
vpcola 0:f1d3878b8dd9 45 {
vpcola 0:f1d3878b8dd9 46 std::string humidstr((const char *)(weather + t[i+1].start), (size_t) t[i+1].end - t[i+1].start);
vpcola 0:f1d3878b8dd9 47 winfo.humidity = strtod(humidstr.c_str(), NULL);
vpcola 0:f1d3878b8dd9 48 i++;
vpcola 0:f1d3878b8dd9 49 }
vpcola 0:f1d3878b8dd9 50 else if (jsoneq(weather, &t[i], "pressure") == 0)
vpcola 0:f1d3878b8dd9 51 {
vpcola 0:f1d3878b8dd9 52 std::string pressurestr((const char *)(weather + t[i+1].start), (size_t) t[i+1].end - t[i+1].start);
vpcola 0:f1d3878b8dd9 53 winfo.pressure = strtod(pressurestr.c_str(), NULL);
vpcola 0:f1d3878b8dd9 54 i++;
vpcola 0:f1d3878b8dd9 55 }else
vpcola 0:f1d3878b8dd9 56 {
vpcola 0:f1d3878b8dd9 57 // discard the rest of the tokens
vpcola 0:f1d3878b8dd9 58 }
vpcola 0:f1d3878b8dd9 59 }
vpcola 0:f1d3878b8dd9 60 return 0;
vpcola 0:f1d3878b8dd9 61 }else
vpcola 0:f1d3878b8dd9 62 return -1;
vpcola 0:f1d3878b8dd9 63 }