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Dependencies: PWM_Tone_Library DHT
Diff: M2XStreamClient/LocationParseFunctions.h
- Revision:
- 3:78f223d34f36
diff -r 3a61e56476bc -r 78f223d34f36 M2XStreamClient/LocationParseFunctions.h --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/M2XStreamClient/LocationParseFunctions.h Tue Mar 05 02:34:44 2019 +0000 @@ -0,0 +1,100 @@ +#ifndef LocationParseFunctions_h +#define LocationParseFunctions_h + +// Data structures and functions used to parse locations + +#define LOCATION_BUF_LEN 20 + +typedef struct { + uint16_t state; + char name_str[LOCATION_BUF_LEN + 1]; + double latitude; + double longitude; + double elevation; + char timestamp_str[LOCATION_BUF_LEN + 1]; + int index; + + location_read_callback callback; + void* context; +} location_parsing_context_state; + +#define WAITING_NAME 0x1 +#define WAITING_LATITUDE 0x2 +#define WAITING_LONGITUDE 0x4 +#define WAITING_ELEVATION 0x8 +#define WAITING_TIMESTAMP 0x10 + +#define GOT_NAME 0x20 +#define GOT_LATITUDE 0x40 +#define GOT_LONGITUDE 0x80 +#define GOT_ELEVATION 0x100 +#define GOT_TIMESTAMP 0x200 + +#define GOT_LOCATION (GOT_NAME | GOT_LATITUDE | GOT_LONGITUDE | GOT_ELEVATION | GOT_TIMESTAMP) +#define TEST_GOT_LOCATION(state_) (((state_) & GOT_LOCATION) == GOT_LOCATION) + +#define TEST_IS_NAME(state_) (((state_) & (WAITING_NAME | GOT_NAME)) == WAITING_NAME) +#define TEST_IS_LATITUDE(state_) (((state_) & (WAITING_LATITUDE | GOT_LATITUDE)) \ + == WAITING_LATITUDE) +#define TEST_IS_LONGITUDE(state_) (((state_) & (WAITING_LONGITUDE | GOT_LONGITUDE)) \ + == WAITING_LONGITUDE) +#define TEST_IS_ELEVATION(state_) (((state_) & (WAITING_ELEVATION | GOT_ELEVATION)) \ + == WAITING_ELEVATION) +#define TEST_IS_TIMESTAMP(state_) (((state_) & (WAITING_TIMESTAMP | GOT_TIMESTAMP)) \ + == WAITING_TIMESTAMP) + +static void on_location_key_found(jsonlite_callback_context* context, + jsonlite_token* token) { + location_parsing_context_state* state = + (location_parsing_context_state*) context->client_state; + if (strncmp((const char*) token->start, "waypoints", 9) == 0) { + // only parses those locations in waypoints, skip the outer one + state->state = 0; + } else if (strncmp((const char*) token->start, "name", 4) == 0) { + state->state |= WAITING_NAME; + } else if (strncmp((const char*) token->start, "latitude", 8) == 0) { + state->state |= WAITING_LATITUDE; + } else if (strncmp((const char*) token->start, "longitude", 9) == 0) { + state->state |= WAITING_LONGITUDE; + } else if (strncmp((const char*) token->start, "elevation", 9) == 0) { + state->state |= WAITING_ELEVATION; + } else if (strncmp((const char*) token->start, "timestamp", 9) == 0) { + state->state |= WAITING_TIMESTAMP; + } +} + +static void on_location_string_found(jsonlite_callback_context* context, + jsonlite_token* token) { + location_parsing_context_state* state = + (location_parsing_context_state*) context->client_state; + + if (TEST_IS_NAME(state->state)) { + strncpy(state->name_str, (const char*) token->start, + MIN(token->end - token->start, LOCATION_BUF_LEN)); + state->name_str[MIN(token->end - token->start, LOCATION_BUF_LEN)] = '\0'; + state->state |= GOT_NAME; + } else if (TEST_IS_LATITUDE(state->state)) { + state->latitude = atof((const char*) token->start); + state->state |= GOT_LATITUDE; + } else if (TEST_IS_LONGITUDE(state->state)) { + state->longitude = atof((const char*) token->start); + state->state |= GOT_LONGITUDE; + } else if (TEST_IS_ELEVATION(state->state)) { + state->elevation = atof((const char*) token->start); + state->state |= GOT_ELEVATION; + } else if (TEST_IS_TIMESTAMP(state->state)) { + strncpy(state->timestamp_str, (const char*) token->start, + MIN(token->end - token->start, LOCATION_BUF_LEN)); + state->timestamp_str[MIN(token->end - token->start, LOCATION_BUF_LEN)] = '\0'; + state->state |= GOT_TIMESTAMP; + } + + if (TEST_GOT_LOCATION(state->state)) { + state->callback(state->name_str, state->latitude, state->longitude, + state->elevation, state->timestamp_str, state->index++, + state->context); + state->state = 0; + } +} + +#endif /* LocationParseFunctions_h */