Function get_array_start

src/backend/utils/adt/jsonfuncs.c:1243–1279

}

static void
get_array_start(void *state)
{
	GetState   *_state = (GetState *) state;
	int			lex_level = _state->lex->lex_level;

	if (lex_level < _state->npath)
	{
		/* Initialize counting of elements in this array */
		_state->array_cur_index[lex_level] = -1;

		/* INT_MIN value is reserved to represent invalid subscript */
		if (_state->path_indexes[lex_level] < 0 &&
			_state->path_indexes[lex_level] != INT_MIN)
		{
			/* Negative subscript -- convert to positive-wise subscript */
			JsonParseErrorType error;
			int			nelements;

			error = json_count_array_elements(_state->lex, &nelements);
			if (error != JSON_SUCCESS)
				json_ereport_error(error, _state->lex);

			if (-_state->path_indexes[lex_level] <= nelements)
				_state->path_indexes[lex_level] += nelements;
		}
	}
	else if (lex_level == 0 && _state->npath == 0)
	{
		/*
		 * Special case: we should match the entire array.  We only need this
		 * at the outermost level because at nested levels the match will have
		 * been started by the outer field or array element callback.
		 */
		_state->result_start = _state->lex->token_start;
	}
}

static void
get_array_end(void *state)