Function json_count_array_elements

src/common/jsonapi.c:218–261

* json_count_array_elements * * Returns number of array elements in lex context at start of array token * until end of array token at same nesting level. * * Designed to be called from array_start routines. */

 * Designed to be called from array_start routines.
 */
JsonParseErrorType
json_count_array_elements(JsonLexContext *lex, int *elements)
{
	JsonLexContext copylex;
	int			count;
	JsonParseErrorType result;

	/*
	 * It's safe to do this with a shallow copy because the lexical routines
	 * don't scribble on the input. They do scribble on the other pointers
	 * etc, so doing this with a copy makes that safe.
	 */
	memcpy(&copylex, lex, sizeof(JsonLexContext));
	copylex.strval = NULL;		/* not interested in values here */
	copylex.lex_level++;

	count = 0;
	result = lex_expect(JSON_PARSE_ARRAY_START, &copylex,
						JSON_TOKEN_ARRAY_START);
	if (result != JSON_SUCCESS)
		return result;
	if (lex_peek(&copylex) != JSON_TOKEN_ARRAY_END)
	{
		while (1)
		{
			count++;
			result = parse_array_element(&copylex, &nullSemAction);
			if (result != JSON_SUCCESS)
				return result;
			if (copylex.token_type != JSON_TOKEN_COMMA)
				break;
			result = json_lex(&copylex);
			if (result != JSON_SUCCESS)
				return result;
		}
	}
	result = lex_expect(JSON_PARSE_ARRAY_NEXT, &copylex,
						JSON_TOKEN_ARRAY_END);
	if (result != JSON_SUCCESS)
		return result;

	*elements = count;
	return JSON_SUCCESS;
}

/*
 *	Recursive Descent parse routines. There is one for each structural