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Dependencies:   PWM_Tone_Library DHT

M2XStreamClient/StreamParseFunctions.h@3:78f223d34f36, 2019-03-05 (annotated)

Committer:
ethaderu
Date:
Tue Mar 05 02:34:44 2019 +0000
Revision:
3:78f223d34f36
Publish 1

Who changed what in which revision?

UserRevisionLine numberNew contents of line
ethaderu 3:78f223d34f36 1 #ifndef StreamParseFunctions_h
ethaderu 3:78f223d34f36 2 #define StreamParseFunctions_h
ethaderu 3:78f223d34f36 3
ethaderu 3:78f223d34f36 4 // Data structures and functions used to parse stream values
ethaderu 3:78f223d34f36 5
ethaderu 3:78f223d34f36 6 #define STREAM_BUF_LEN 32
ethaderu 3:78f223d34f36 7
ethaderu 3:78f223d34f36 8 typedef struct {
ethaderu 3:78f223d34f36 9 uint8_t state;
ethaderu 3:78f223d34f36 10 char at_str[STREAM_BUF_LEN + 1];
ethaderu 3:78f223d34f36 11 char value_str[STREAM_BUF_LEN + 1];
ethaderu 3:78f223d34f36 12 int index;
ethaderu 3:78f223d34f36 13
ethaderu 3:78f223d34f36 14 stream_value_read_callback callback;
ethaderu 3:78f223d34f36 15 void* context;
ethaderu 3:78f223d34f36 16 } stream_parsing_context_state;
ethaderu 3:78f223d34f36 17
ethaderu 3:78f223d34f36 18 #define WAITING_AT 0x1
ethaderu 3:78f223d34f36 19 #define GOT_AT 0x2
ethaderu 3:78f223d34f36 20 #define WAITING_VALUE 0x4
ethaderu 3:78f223d34f36 21 #define GOT_VALUE 0x8
ethaderu 3:78f223d34f36 22
ethaderu 3:78f223d34f36 23 #define GOT_STREAM (GOT_AT | GOT_VALUE)
ethaderu 3:78f223d34f36 24 #define TEST_GOT_STREAM(state_) (((state_) & GOT_STREAM) == GOT_STREAM)
ethaderu 3:78f223d34f36 25
ethaderu 3:78f223d34f36 26 #define TEST_IS_AT(state_) (((state_) & (WAITING_AT | GOT_AT)) == WAITING_AT)
ethaderu 3:78f223d34f36 27 #define TEST_IS_VALUE(state_) (((state_) & (WAITING_VALUE | GOT_VALUE)) == \
ethaderu 3:78f223d34f36 28 WAITING_VALUE)
ethaderu 3:78f223d34f36 29
ethaderu 3:78f223d34f36 30 static void on_stream_key_found(jsonlite_callback_context* context,
ethaderu 3:78f223d34f36 31 jsonlite_token* token)
ethaderu 3:78f223d34f36 32 {
ethaderu 3:78f223d34f36 33 stream_parsing_context_state* state =
ethaderu 3:78f223d34f36 34 (stream_parsing_context_state*) context->client_state;
ethaderu 3:78f223d34f36 35 if (strncmp((const char*) token->start, "timestamp", 2) == 0) {
ethaderu 3:78f223d34f36 36 state->state |= WAITING_AT;
ethaderu 3:78f223d34f36 37 } else if ((strncmp((const char*) token->start, "value", 5) == 0) &&
ethaderu 3:78f223d34f36 38 (token->start[5] != 's')) { // get rid of "values"
ethaderu 3:78f223d34f36 39 state->state |= WAITING_VALUE;
ethaderu 3:78f223d34f36 40 }
ethaderu 3:78f223d34f36 41 }
ethaderu 3:78f223d34f36 42
ethaderu 3:78f223d34f36 43 static void on_stream_value_found(jsonlite_callback_context* context,
ethaderu 3:78f223d34f36 44 jsonlite_token* token,
ethaderu 3:78f223d34f36 45 int type)
ethaderu 3:78f223d34f36 46 {
ethaderu 3:78f223d34f36 47 stream_parsing_context_state* state =
ethaderu 3:78f223d34f36 48 (stream_parsing_context_state*) context->client_state;
ethaderu 3:78f223d34f36 49
ethaderu 3:78f223d34f36 50 if (TEST_IS_AT(state->state)) {
ethaderu 3:78f223d34f36 51 strncpy(state->at_str, (const char*) token->start,
ethaderu 3:78f223d34f36 52 MIN(token->end - token->start, STREAM_BUF_LEN));
ethaderu 3:78f223d34f36 53 state->at_str[MIN(token->end - token->start, STREAM_BUF_LEN)] = '\0';
ethaderu 3:78f223d34f36 54 state->state |= GOT_AT;
ethaderu 3:78f223d34f36 55 } else if (TEST_IS_VALUE(state->state)) {
ethaderu 3:78f223d34f36 56 strncpy(state->value_str, (const char*) token->start,
ethaderu 3:78f223d34f36 57 MIN(token->end - token->start, STREAM_BUF_LEN));
ethaderu 3:78f223d34f36 58 state->value_str[MIN(token->end - token->start, STREAM_BUF_LEN)] = '\0';
ethaderu 3:78f223d34f36 59 state->state |= GOT_VALUE;
ethaderu 3:78f223d34f36 60 }
ethaderu 3:78f223d34f36 61
ethaderu 3:78f223d34f36 62 if (TEST_GOT_STREAM(state->state)) {
ethaderu 3:78f223d34f36 63 state->callback(state->at_str, state->value_str,
ethaderu 3:78f223d34f36 64 state->index++, state->context, type);
ethaderu 3:78f223d34f36 65 state->state = 0;
ethaderu 3:78f223d34f36 66 }
ethaderu 3:78f223d34f36 67 }
ethaderu 3:78f223d34f36 68
ethaderu 3:78f223d34f36 69 static void on_stream_string_found(jsonlite_callback_context* context,
ethaderu 3:78f223d34f36 70 jsonlite_token* token)
ethaderu 3:78f223d34f36 71 {
ethaderu 3:78f223d34f36 72 on_stream_value_found(context, token, 1);
ethaderu 3:78f223d34f36 73 }
ethaderu 3:78f223d34f36 74
ethaderu 3:78f223d34f36 75 static void on_stream_number_found(jsonlite_callback_context* context,
ethaderu 3:78f223d34f36 76 jsonlite_token* token)
ethaderu 3:78f223d34f36 77 {
ethaderu 3:78f223d34f36 78 on_stream_value_found(context, token, 2);
ethaderu 3:78f223d34f36 79 }
ethaderu 3:78f223d34f36 80
ethaderu 3:78f223d34f36 81 #endif /* StreamParseFunctions_h */