function brackets() {
			for (;;) {
				oToken = that.advance();
				if (!oToken || oToken.id === ";") {
					that.expected("')'", oToken);
				}
				sValue += oToken.value;
				if (oToken.id === ")") {
					return;
				}
				if (oToken.id === "(") {
					brackets();
				}
			}
		}
The function parses anything until the next ';' or ')' into a string. It counts the brackets;
for each '(' a corresponding ')' must be found before the parse is finished. It does nothing
to validate the given content.

@param {object} oStartToken
  The token at which the parsing started; its value will become the key in the result
@returns {object}
  An object with the value of the starting token as key and the parsed string as value.